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annotate libtommath/bn_mp_prime_strong_lucas_selfridge.c @ 1680:5e763ad6e2e0
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author | Matt Johnston <matt@ucc.asn.au> |
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date | Sun, 24 May 2020 13:34:19 +0800 |
parents | f52919ffd3b1 |
children | 1051e4eea25a |
rev | line source |
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1655
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1 #include "tommath_private.h" |
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2 #ifdef BN_MP_PRIME_STRONG_LUCAS_SELFRIDGE_C |
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3 |
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4 /* LibTomMath, multiple-precision integer library -- Tom St Denis |
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5 * |
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6 * LibTomMath is a library that provides multiple-precision |
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7 * integer arithmetic as well as number theoretic functionality. |
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8 * |
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9 * The library was designed directly after the MPI library by |
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10 * Michael Fromberger but has been written from scratch with |
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11 * additional optimizations in place. |
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12 * |
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13 * SPDX-License-Identifier: Unlicense |
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14 */ |
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15 |
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16 /* |
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17 * See file bn_mp_prime_is_prime.c or the documentation in doc/bn.tex for the details |
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18 */ |
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19 #ifndef LTM_USE_FIPS_ONLY |
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20 |
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21 /* |
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22 * 8-bit is just too small. You can try the Frobenius test |
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23 * but that frobenius test can fail, too, for the same reason. |
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24 */ |
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25 #ifndef MP_8BIT |
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26 |
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27 /* |
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28 * multiply bigint a with int d and put the result in c |
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29 * Like mp_mul_d() but with a signed long as the small input |
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30 */ |
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31 static int s_mp_mul_si(const mp_int *a, long d, mp_int *c) |
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32 { |
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33 mp_int t; |
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34 int err, neg = 0; |
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35 |
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36 if ((err = mp_init(&t)) != MP_OKAY) { |
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37 return err; |
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38 } |
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39 if (d < 0) { |
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40 neg = 1; |
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41 d = -d; |
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42 } |
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43 |
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44 /* |
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45 * mp_digit might be smaller than a long, which excludes |
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46 * the use of mp_mul_d() here. |
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47 */ |
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48 if ((err = mp_set_long(&t, (unsigned long) d)) != MP_OKAY) { |
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49 goto LBL_MPMULSI_ERR; |
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50 } |
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51 if ((err = mp_mul(a, &t, c)) != MP_OKAY) { |
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52 goto LBL_MPMULSI_ERR; |
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53 } |
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54 if (neg == 1) { |
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55 c->sign = (a->sign == MP_NEG) ? MP_ZPOS: MP_NEG; |
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56 } |
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57 LBL_MPMULSI_ERR: |
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58 mp_clear(&t); |
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59 return err; |
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60 } |
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61 /* |
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62 Strong Lucas-Selfridge test. |
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63 returns MP_YES if it is a strong L-S prime, MP_NO if it is composite |
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64 |
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65 Code ported from Thomas Ray Nicely's implementation of the BPSW test |
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66 at http://www.trnicely.net/misc/bpsw.html |
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67 |
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68 Freeware copyright (C) 2016 Thomas R. Nicely <http://www.trnicely.net>. |
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69 Released into the public domain by the author, who disclaims any legal |
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70 liability arising from its use |
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71 |
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72 The multi-line comments are made by Thomas R. Nicely and are copied verbatim. |
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73 Additional comments marked "CZ" (without the quotes) are by the code-portist. |
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74 |
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75 (If that name sounds familiar, he is the guy who found the fdiv bug in the |
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76 Pentium (P5x, I think) Intel processor) |
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77 */ |
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78 int mp_prime_strong_lucas_selfridge(const mp_int *a, int *result) |
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79 { |
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80 /* CZ TODO: choose better variable names! */ |
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81 mp_int Dz, gcd, Np1, Uz, Vz, U2mz, V2mz, Qmz, Q2mz, Qkdz, T1z, T2z, T3z, T4z, Q2kdz; |
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82 /* CZ TODO: Some of them need the full 32 bit, hence the (temporary) exclusion of MP_8BIT */ |
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83 int32_t D, Ds, J, sign, P, Q, r, s, u, Nbits; |
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84 int e; |
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85 int isset, oddness; |
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86 |
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87 *result = MP_NO; |
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88 /* |
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89 Find the first element D in the sequence {5, -7, 9, -11, 13, ...} |
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90 such that Jacobi(D,N) = -1 (Selfridge's algorithm). Theory |
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91 indicates that, if N is not a perfect square, D will "nearly |
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92 always" be "small." Just in case, an overflow trap for D is |
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93 included. |
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94 */ |
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95 |
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96 if ((e = mp_init_multi(&Dz, &gcd, &Np1, &Uz, &Vz, &U2mz, &V2mz, &Qmz, &Q2mz, &Qkdz, &T1z, &T2z, &T3z, &T4z, &Q2kdz, |
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97 NULL)) != MP_OKAY) { |
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98 return e; |
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99 } |
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100 |
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101 D = 5; |
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102 sign = 1; |
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103 |
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104 for (;;) { |
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105 Ds = sign * D; |
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106 sign = -sign; |
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107 if ((e = mp_set_long(&Dz, (unsigned long)D)) != MP_OKAY) { |
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108 goto LBL_LS_ERR; |
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109 } |
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110 if ((e = mp_gcd(a, &Dz, &gcd)) != MP_OKAY) { |
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111 goto LBL_LS_ERR; |
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112 } |
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113 /* if 1 < GCD < N then N is composite with factor "D", and |
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114 Jacobi(D,N) is technically undefined (but often returned |
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115 as zero). */ |
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116 if ((mp_cmp_d(&gcd, 1uL) == MP_GT) && (mp_cmp(&gcd, a) == MP_LT)) { |
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117 goto LBL_LS_ERR; |
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118 } |
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119 if (Ds < 0) { |
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120 Dz.sign = MP_NEG; |
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121 } |
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122 if ((e = mp_kronecker(&Dz, a, &J)) != MP_OKAY) { |
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123 goto LBL_LS_ERR; |
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124 } |
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125 |
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126 if (J == -1) { |
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127 break; |
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128 } |
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129 D += 2; |
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130 |
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131 if (D > (INT_MAX - 2)) { |
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132 e = MP_VAL; |
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133 goto LBL_LS_ERR; |
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134 } |
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135 } |
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136 |
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137 |
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138 |
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139 P = 1; /* Selfridge's choice */ |
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140 Q = (1 - Ds) / 4; /* Required so D = P*P - 4*Q */ |
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141 |
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142 /* NOTE: The conditions (a) N does not divide Q, and |
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143 (b) D is square-free or not a perfect square, are included by |
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144 some authors; e.g., "Prime numbers and computer methods for |
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145 factorization," Hans Riesel (2nd ed., 1994, Birkhauser, Boston), |
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146 p. 130. For this particular application of Lucas sequences, |
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147 these conditions were found to be immaterial. */ |
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148 |
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149 /* Now calculate N - Jacobi(D,N) = N + 1 (even), and calculate the |
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150 odd positive integer d and positive integer s for which |
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151 N + 1 = 2^s*d (similar to the step for N - 1 in Miller's test). |
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152 The strong Lucas-Selfridge test then returns N as a strong |
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153 Lucas probable prime (slprp) if any of the following |
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154 conditions is met: U_d=0, V_d=0, V_2d=0, V_4d=0, V_8d=0, |
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155 V_16d=0, ..., etc., ending with V_{2^(s-1)*d}=V_{(N+1)/2}=0 |
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156 (all equalities mod N). Thus d is the highest index of U that |
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157 must be computed (since V_2m is independent of U), compared |
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158 to U_{N+1} for the standard Lucas-Selfridge test; and no |
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159 index of V beyond (N+1)/2 is required, just as in the |
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160 standard Lucas-Selfridge test. However, the quantity Q^d must |
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161 be computed for use (if necessary) in the latter stages of |
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162 the test. The result is that the strong Lucas-Selfridge test |
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163 has a running time only slightly greater (order of 10 %) than |
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164 that of the standard Lucas-Selfridge test, while producing |
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165 only (roughly) 30 % as many pseudoprimes (and every strong |
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166 Lucas pseudoprime is also a standard Lucas pseudoprime). Thus |
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167 the evidence indicates that the strong Lucas-Selfridge test is |
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168 more effective than the standard Lucas-Selfridge test, and a |
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169 Baillie-PSW test based on the strong Lucas-Selfridge test |
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170 should be more reliable. */ |
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171 |
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172 if ((e = mp_add_d(a, 1uL, &Np1)) != MP_OKAY) { |
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173 goto LBL_LS_ERR; |
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174 } |
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175 s = mp_cnt_lsb(&Np1); |
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176 |
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177 /* CZ |
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178 * This should round towards zero because |
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179 * Thomas R. Nicely used GMP's mpz_tdiv_q_2exp() |
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180 * and mp_div_2d() is equivalent. Additionally: |
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181 * dividing an even number by two does not produce |
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182 * any leftovers. |
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183 */ |
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184 if ((e = mp_div_2d(&Np1, s, &Dz, NULL)) != MP_OKAY) { |
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185 goto LBL_LS_ERR; |
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186 } |
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187 /* We must now compute U_d and V_d. Since d is odd, the accumulated |
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188 values U and V are initialized to U_1 and V_1 (if the target |
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189 index were even, U and V would be initialized instead to U_0=0 |
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190 and V_0=2). The values of U_2m and V_2m are also initialized to |
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191 U_1 and V_1; the FOR loop calculates in succession U_2 and V_2, |
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
192 U_4 and V_4, U_8 and V_8, etc. If the corresponding bits |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
193 (1, 2, 3, ...) of t are on (the zero bit having been accounted |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
194 for in the initialization of U and V), these values are then |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
195 combined with the previous totals for U and V, using the |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
196 composition formulas for addition of indices. */ |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
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changeset
|
197 |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
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|
198 mp_set(&Uz, 1uL); /* U=U_1 */ |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
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|
199 mp_set(&Vz, (mp_digit)P); /* V=V_1 */ |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
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|
200 mp_set(&U2mz, 1uL); /* U_1 */ |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
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changeset
|
201 mp_set(&V2mz, (mp_digit)P); /* V_1 */ |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
202 |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
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changeset
|
203 if (Q < 0) { |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
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|
204 Q = -Q; |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
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|
205 if ((e = mp_set_long(&Qmz, (unsigned long)Q)) != MP_OKAY) { |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
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|
206 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
207 } |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
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|
208 if ((e = mp_mul_2(&Qmz, &Q2mz)) != MP_OKAY) { |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
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|
209 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
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changeset
|
210 } |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
211 /* Initializes calculation of Q^d */ |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
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|
212 if ((e = mp_set_long(&Qkdz, (unsigned long)Q)) != MP_OKAY) { |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
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|
213 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
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changeset
|
214 } |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
215 Qmz.sign = MP_NEG; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
216 Q2mz.sign = MP_NEG; |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
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changeset
|
217 Qkdz.sign = MP_NEG; |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
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|
218 Q = -Q; |
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
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|
219 } else { |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
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|
220 if ((e = mp_set_long(&Qmz, (unsigned long)Q)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
221 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
222 } |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
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changeset
|
223 if ((e = mp_mul_2(&Qmz, &Q2mz)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
224 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
225 } |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
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changeset
|
226 /* Initializes calculation of Q^d */ |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
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|
227 if ((e = mp_set_long(&Qkdz, (unsigned long)Q)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
228 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
229 } |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
230 } |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
231 |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
232 Nbits = mp_count_bits(&Dz); |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
233 |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
234 for (u = 1; u < Nbits; u++) { /* zero bit off, already accounted for */ |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
235 /* Formulas for doubling of indices (carried out mod N). Note that |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
236 * the indices denoted as "2m" are actually powers of 2, specifically |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
237 * 2^(ul-1) beginning each loop and 2^ul ending each loop. |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
238 * |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
239 * U_2m = U_m*V_m |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
240 * V_2m = V_m*V_m - 2*Q^m |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
241 */ |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
242 |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
243 if ((e = mp_mul(&U2mz, &V2mz, &U2mz)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
244 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
245 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
246 if ((e = mp_mod(&U2mz, a, &U2mz)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
247 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
248 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
249 if ((e = mp_sqr(&V2mz, &V2mz)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
250 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
251 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
252 if ((e = mp_sub(&V2mz, &Q2mz, &V2mz)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
253 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
254 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
255 if ((e = mp_mod(&V2mz, a, &V2mz)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
256 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
257 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
258 /* Must calculate powers of Q for use in V_2m, also for Q^d later */ |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
259 if ((e = mp_sqr(&Qmz, &Qmz)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
260 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
261 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
262 /* prevents overflow */ /* CZ still necessary without a fixed prealloc'd mem.? */ |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
263 if ((e = mp_mod(&Qmz, a, &Qmz)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
264 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
265 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
266 if ((e = mp_mul_2(&Qmz, &Q2mz)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
267 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
268 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
269 if ((isset = mp_get_bit(&Dz, u)) == MP_VAL) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
270 e = isset; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
271 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
272 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
273 if (isset == MP_YES) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
274 /* Formulas for addition of indices (carried out mod N); |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
275 * |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
276 * U_(m+n) = (U_m*V_n + U_n*V_m)/2 |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
277 * V_(m+n) = (V_m*V_n + D*U_m*U_n)/2 |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
278 * |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
279 * Be careful with division by 2 (mod N)! |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
280 */ |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
281 if ((e = mp_mul(&U2mz, &Vz, &T1z)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
282 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
283 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
284 if ((e = mp_mul(&Uz, &V2mz, &T2z)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
285 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
286 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
287 if ((e = mp_mul(&V2mz, &Vz, &T3z)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
288 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
289 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
290 if ((e = mp_mul(&U2mz, &Uz, &T4z)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
291 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
292 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
293 if ((e = s_mp_mul_si(&T4z, (long)Ds, &T4z)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
294 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
295 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
296 if ((e = mp_add(&T1z, &T2z, &Uz)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
297 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
298 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
299 if (mp_isodd(&Uz) != MP_NO) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
300 if ((e = mp_add(&Uz, a, &Uz)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
301 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
302 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
303 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
304 /* CZ |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
305 * This should round towards negative infinity because |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
306 * Thomas R. Nicely used GMP's mpz_fdiv_q_2exp(). |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
307 * But mp_div_2() does not do so, it is truncating instead. |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
308 */ |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
309 oddness = mp_isodd(&Uz); |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
310 if ((e = mp_div_2(&Uz, &Uz)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
311 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
312 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
313 if ((Uz.sign == MP_NEG) && (oddness != MP_NO)) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
314 if ((e = mp_sub_d(&Uz, 1uL, &Uz)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
315 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
316 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
317 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
318 if ((e = mp_add(&T3z, &T4z, &Vz)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
319 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
320 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
321 if (mp_isodd(&Vz) != MP_NO) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
322 if ((e = mp_add(&Vz, a, &Vz)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
323 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
324 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
325 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
326 oddness = mp_isodd(&Vz); |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
327 if ((e = mp_div_2(&Vz, &Vz)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
328 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
329 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
330 if ((Vz.sign == MP_NEG) && (oddness != MP_NO)) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
331 if ((e = mp_sub_d(&Vz, 1uL, &Vz)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
332 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
333 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
334 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
335 if ((e = mp_mod(&Uz, a, &Uz)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
336 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
337 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
338 if ((e = mp_mod(&Vz, a, &Vz)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
339 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
340 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
341 /* Calculating Q^d for later use */ |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
342 if ((e = mp_mul(&Qkdz, &Qmz, &Qkdz)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
343 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
344 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
345 if ((e = mp_mod(&Qkdz, a, &Qkdz)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
346 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
347 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
348 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
349 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
350 |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
351 /* If U_d or V_d is congruent to 0 mod N, then N is a prime or a |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
352 strong Lucas pseudoprime. */ |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
353 if ((mp_iszero(&Uz) != MP_NO) || (mp_iszero(&Vz) != MP_NO)) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
354 *result = MP_YES; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
355 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
356 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
357 |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
358 /* NOTE: Ribenboim ("The new book of prime number records," 3rd ed., |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
359 1995/6) omits the condition V0 on p.142, but includes it on |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
360 p. 130. The condition is NECESSARY; otherwise the test will |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
361 return false negatives---e.g., the primes 29 and 2000029 will be |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
362 returned as composite. */ |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
363 |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
364 /* Otherwise, we must compute V_2d, V_4d, V_8d, ..., V_{2^(s-1)*d} |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
365 by repeated use of the formula V_2m = V_m*V_m - 2*Q^m. If any of |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
366 these are congruent to 0 mod N, then N is a prime or a strong |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
367 Lucas pseudoprime. */ |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
368 |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
369 /* Initialize 2*Q^(d*2^r) for V_2m */ |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
370 if ((e = mp_mul_2(&Qkdz, &Q2kdz)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
371 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
372 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
373 |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
374 for (r = 1; r < s; r++) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
375 if ((e = mp_sqr(&Vz, &Vz)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
376 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
377 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
378 if ((e = mp_sub(&Vz, &Q2kdz, &Vz)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
379 goto LBL_LS_ERR; |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
380 } |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
381 if ((e = mp_mod(&Vz, a, &Vz)) != MP_OKAY) { |
f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents:
diff
changeset
|
382 goto LBL_LS_ERR; |
f52919ffd3b1
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383 } |
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384 if (mp_iszero(&Vz) != MP_NO) { |
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385 *result = MP_YES; |
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386 goto LBL_LS_ERR; |
f52919ffd3b1
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387 } |
f52919ffd3b1
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388 /* Calculate Q^{d*2^r} for next r (final iteration irrelevant). */ |
f52919ffd3b1
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389 if (r < (s - 1)) { |
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390 if ((e = mp_sqr(&Qkdz, &Qkdz)) != MP_OKAY) { |
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391 goto LBL_LS_ERR; |
f52919ffd3b1
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392 } |
f52919ffd3b1
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393 if ((e = mp_mod(&Qkdz, a, &Qkdz)) != MP_OKAY) { |
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394 goto LBL_LS_ERR; |
f52919ffd3b1
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Steffen Jaeckel <s_jaeckel@gmx.de>
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395 } |
f52919ffd3b1
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396 if ((e = mp_mul_2(&Qkdz, &Q2kdz)) != MP_OKAY) { |
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Steffen Jaeckel <s_jaeckel@gmx.de>
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397 goto LBL_LS_ERR; |
f52919ffd3b1
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398 } |
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399 } |
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400 } |
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401 LBL_LS_ERR: |
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402 mp_clear_multi(&Q2kdz, &T4z, &T3z, &T2z, &T1z, &Qkdz, &Q2mz, &Qmz, &V2mz, &U2mz, &Vz, &Uz, &Np1, &gcd, &Dz, NULL); |
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403 return e; |
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Steffen Jaeckel <s_jaeckel@gmx.de>
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404 } |
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405 #endif |
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406 #endif |
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407 #endif |
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Steffen Jaeckel <s_jaeckel@gmx.de>
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408 |
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Steffen Jaeckel <s_jaeckel@gmx.de>
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409 /* ref: HEAD -> master, tag: v1.1.0 */ |
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410 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */ |
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411 /* commit time: 2019-01-28 20:32:32 +0100 */ |