Mercurial > dropbear
annotate libtommath/bn_mp_prime_strong_lucas_selfridge.c @ 1762:5879c5829e85
Added tag DROPBEAR_2020.81 for changeset 4b984c42372d
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 29 Oct 2020 21:40:27 +0800 |
parents | 1051e4eea25a |
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rev | line source |
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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 /* SPDX-License-Identifier: Unlicense */ |
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6 |
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7 /* |
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8 * See file bn_mp_prime_is_prime.c or the documentation in doc/bn.tex for the details |
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9 */ |
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10 #ifndef LTM_USE_ONLY_MR |
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11 |
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12 /* |
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13 * 8-bit is just too small. You can try the Frobenius test |
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14 * but that frobenius test can fail, too, for the same reason. |
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15 */ |
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16 #ifndef MP_8BIT |
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17 |
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18 /* |
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19 * multiply bigint a with int d and put the result in c |
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20 * Like mp_mul_d() but with a signed long as the small input |
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21 */ |
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22 static mp_err s_mp_mul_si(const mp_int *a, int32_t d, mp_int *c) |
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23 { |
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24 mp_int t; |
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25 mp_err err; |
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26 |
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27 if ((err = mp_init(&t)) != MP_OKAY) { |
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28 return err; |
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29 } |
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30 |
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31 /* |
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32 * mp_digit might be smaller than a long, which excludes |
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33 * the use of mp_mul_d() here. |
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34 */ |
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35 mp_set_i32(&t, d); |
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36 err = mp_mul(a, &t, c); |
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37 mp_clear(&t); |
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38 return err; |
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39 } |
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40 /* |
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41 Strong Lucas-Selfridge test. |
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42 returns MP_YES if it is a strong L-S prime, MP_NO if it is composite |
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43 |
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44 Code ported from Thomas Ray Nicely's implementation of the BPSW test |
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45 at http://www.trnicely.net/misc/bpsw.html |
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46 |
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47 Freeware copyright (C) 2016 Thomas R. Nicely <http://www.trnicely.net>. |
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48 Released into the public domain by the author, who disclaims any legal |
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49 liability arising from its use |
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50 |
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51 The multi-line comments are made by Thomas R. Nicely and are copied verbatim. |
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52 Additional comments marked "CZ" (without the quotes) are by the code-portist. |
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53 |
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54 (If that name sounds familiar, he is the guy who found the fdiv bug in the |
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55 Pentium (P5x, I think) Intel processor) |
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56 */ |
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57 mp_err mp_prime_strong_lucas_selfridge(const mp_int *a, mp_bool *result) |
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58 { |
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59 /* CZ TODO: choose better variable names! */ |
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60 mp_int Dz, gcd, Np1, Uz, Vz, U2mz, V2mz, Qmz, Q2mz, Qkdz, T1z, T2z, T3z, T4z, Q2kdz; |
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61 /* CZ TODO: Some of them need the full 32 bit, hence the (temporary) exclusion of MP_8BIT */ |
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62 int32_t D, Ds, J, sign, P, Q, r, s, u, Nbits; |
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63 mp_err err; |
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64 mp_bool oddness; |
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65 |
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66 *result = MP_NO; |
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67 /* |
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68 Find the first element D in the sequence {5, -7, 9, -11, 13, ...} |
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69 such that Jacobi(D,N) = -1 (Selfridge's algorithm). Theory |
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70 indicates that, if N is not a perfect square, D will "nearly |
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71 always" be "small." Just in case, an overflow trap for D is |
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72 included. |
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73 */ |
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74 |
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75 if ((err = mp_init_multi(&Dz, &gcd, &Np1, &Uz, &Vz, &U2mz, &V2mz, &Qmz, &Q2mz, &Qkdz, &T1z, &T2z, &T3z, &T4z, &Q2kdz, |
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76 NULL)) != MP_OKAY) { |
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77 return err; |
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78 } |
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79 |
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80 D = 5; |
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81 sign = 1; |
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82 |
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83 for (;;) { |
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84 Ds = sign * D; |
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85 sign = -sign; |
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86 mp_set_u32(&Dz, (uint32_t)D); |
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87 if ((err = mp_gcd(a, &Dz, &gcd)) != MP_OKAY) goto LBL_LS_ERR; |
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88 |
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89 /* if 1 < GCD < N then N is composite with factor "D", and |
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90 Jacobi(D,N) is technically undefined (but often returned |
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91 as zero). */ |
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92 if ((mp_cmp_d(&gcd, 1uL) == MP_GT) && (mp_cmp(&gcd, a) == MP_LT)) { |
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93 goto LBL_LS_ERR; |
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94 } |
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95 if (Ds < 0) { |
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96 Dz.sign = MP_NEG; |
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97 } |
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98 if ((err = mp_kronecker(&Dz, a, &J)) != MP_OKAY) goto LBL_LS_ERR; |
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99 |
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100 if (J == -1) { |
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101 break; |
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102 } |
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103 D += 2; |
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104 |
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105 if (D > (INT_MAX - 2)) { |
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106 err = MP_VAL; |
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107 goto LBL_LS_ERR; |
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108 } |
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109 } |
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110 |
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111 |
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112 |
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113 P = 1; /* Selfridge's choice */ |
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114 Q = (1 - Ds) / 4; /* Required so D = P*P - 4*Q */ |
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115 |
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116 /* NOTE: The conditions (a) N does not divide Q, and |
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117 (b) D is square-free or not a perfect square, are included by |
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118 some authors; e.g., "Prime numbers and computer methods for |
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119 factorization," Hans Riesel (2nd ed., 1994, Birkhauser, Boston), |
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120 p. 130. For this particular application of Lucas sequences, |
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121 these conditions were found to be immaterial. */ |
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122 |
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123 /* Now calculate N - Jacobi(D,N) = N + 1 (even), and calculate the |
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124 odd positive integer d and positive integer s for which |
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125 N + 1 = 2^s*d (similar to the step for N - 1 in Miller's test). |
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126 The strong Lucas-Selfridge test then returns N as a strong |
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127 Lucas probable prime (slprp) if any of the following |
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128 conditions is met: U_d=0, V_d=0, V_2d=0, V_4d=0, V_8d=0, |
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129 V_16d=0, ..., etc., ending with V_{2^(s-1)*d}=V_{(N+1)/2}=0 |
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130 (all equalities mod N). Thus d is the highest index of U that |
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131 must be computed (since V_2m is independent of U), compared |
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132 to U_{N+1} for the standard Lucas-Selfridge test; and no |
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133 index of V beyond (N+1)/2 is required, just as in the |
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134 standard Lucas-Selfridge test. However, the quantity Q^d must |
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135 be computed for use (if necessary) in the latter stages of |
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136 the test. The result is that the strong Lucas-Selfridge test |
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137 has a running time only slightly greater (order of 10 %) than |
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138 that of the standard Lucas-Selfridge test, while producing |
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139 only (roughly) 30 % as many pseudoprimes (and every strong |
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140 Lucas pseudoprime is also a standard Lucas pseudoprime). Thus |
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141 the evidence indicates that the strong Lucas-Selfridge test is |
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142 more effective than the standard Lucas-Selfridge test, and a |
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143 Baillie-PSW test based on the strong Lucas-Selfridge test |
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144 should be more reliable. */ |
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145 |
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146 if ((err = mp_add_d(a, 1uL, &Np1)) != MP_OKAY) goto LBL_LS_ERR; |
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147 s = mp_cnt_lsb(&Np1); |
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148 |
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149 /* CZ |
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150 * This should round towards zero because |
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151 * Thomas R. Nicely used GMP's mpz_tdiv_q_2exp() |
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152 * and mp_div_2d() is equivalent. Additionally: |
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153 * dividing an even number by two does not produce |
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154 * any leftovers. |
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155 */ |
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156 if ((err = mp_div_2d(&Np1, s, &Dz, NULL)) != MP_OKAY) goto LBL_LS_ERR; |
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157 /* We must now compute U_d and V_d. Since d is odd, the accumulated |
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158 values U and V are initialized to U_1 and V_1 (if the target |
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159 index were even, U and V would be initialized instead to U_0=0 |
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160 and V_0=2). The values of U_2m and V_2m are also initialized to |
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161 U_1 and V_1; the FOR loop calculates in succession U_2 and V_2, |
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162 U_4 and V_4, U_8 and V_8, etc. If the corresponding bits |
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163 (1, 2, 3, ...) of t are on (the zero bit having been accounted |
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164 for in the initialization of U and V), these values are then |
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165 combined with the previous totals for U and V, using the |
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166 composition formulas for addition of indices. */ |
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167 |
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168 mp_set(&Uz, 1uL); /* U=U_1 */ |
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169 mp_set(&Vz, (mp_digit)P); /* V=V_1 */ |
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170 mp_set(&U2mz, 1uL); /* U_1 */ |
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171 mp_set(&V2mz, (mp_digit)P); /* V_1 */ |
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172 |
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173 mp_set_i32(&Qmz, Q); |
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174 if ((err = mp_mul_2(&Qmz, &Q2mz)) != MP_OKAY) goto LBL_LS_ERR; |
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175 /* Initializes calculation of Q^d */ |
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176 mp_set_i32(&Qkdz, Q); |
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177 |
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178 Nbits = mp_count_bits(&Dz); |
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179 |
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180 for (u = 1; u < Nbits; u++) { /* zero bit off, already accounted for */ |
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181 /* Formulas for doubling of indices (carried out mod N). Note that |
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182 * the indices denoted as "2m" are actually powers of 2, specifically |
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183 * 2^(ul-1) beginning each loop and 2^ul ending each loop. |
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184 * |
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185 * U_2m = U_m*V_m |
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186 * V_2m = V_m*V_m - 2*Q^m |
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187 */ |
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188 |
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189 if ((err = mp_mul(&U2mz, &V2mz, &U2mz)) != MP_OKAY) goto LBL_LS_ERR; |
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190 if ((err = mp_mod(&U2mz, a, &U2mz)) != MP_OKAY) goto LBL_LS_ERR; |
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191 if ((err = mp_sqr(&V2mz, &V2mz)) != MP_OKAY) goto LBL_LS_ERR; |
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Update LibTomMath to 1.2.0 (#84)
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192 if ((err = mp_sub(&V2mz, &Q2mz, &V2mz)) != MP_OKAY) goto LBL_LS_ERR; |
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Update LibTomMath to 1.2.0 (#84)
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193 if ((err = mp_mod(&V2mz, a, &V2mz)) != MP_OKAY) goto LBL_LS_ERR; |
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Update LibTomMath to 1.2.0 (#84)
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194 |
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195 /* Must calculate powers of Q for use in V_2m, also for Q^d later */ |
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196 if ((err = mp_sqr(&Qmz, &Qmz)) != MP_OKAY) goto LBL_LS_ERR; |
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Update LibTomMath to 1.2.0 (#84)
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197 |
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198 /* prevents overflow */ /* CZ still necessary without a fixed prealloc'd mem.? */ |
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199 if ((err = mp_mod(&Qmz, a, &Qmz)) != MP_OKAY) goto LBL_LS_ERR; |
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Update LibTomMath to 1.2.0 (#84)
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200 if ((err = mp_mul_2(&Qmz, &Q2mz)) != MP_OKAY) goto LBL_LS_ERR; |
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Update LibTomMath to 1.2.0 (#84)
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201 |
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202 if (s_mp_get_bit(&Dz, (unsigned int)u) == MP_YES) { |
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203 /* Formulas for addition of indices (carried out mod N); |
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204 * |
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205 * U_(m+n) = (U_m*V_n + U_n*V_m)/2 |
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206 * V_(m+n) = (V_m*V_n + D*U_m*U_n)/2 |
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207 * |
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208 * Be careful with division by 2 (mod N)! |
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209 */ |
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210 if ((err = mp_mul(&U2mz, &Vz, &T1z)) != MP_OKAY) goto LBL_LS_ERR; |
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211 if ((err = mp_mul(&Uz, &V2mz, &T2z)) != MP_OKAY) goto LBL_LS_ERR; |
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212 if ((err = mp_mul(&V2mz, &Vz, &T3z)) != MP_OKAY) goto LBL_LS_ERR; |
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213 if ((err = mp_mul(&U2mz, &Uz, &T4z)) != MP_OKAY) goto LBL_LS_ERR; |
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214 if ((err = s_mp_mul_si(&T4z, Ds, &T4z)) != MP_OKAY) goto LBL_LS_ERR; |
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215 if ((err = mp_add(&T1z, &T2z, &Uz)) != MP_OKAY) goto LBL_LS_ERR; |
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216 if (MP_IS_ODD(&Uz)) { |
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217 if ((err = mp_add(&Uz, a, &Uz)) != MP_OKAY) goto LBL_LS_ERR; |
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218 } |
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219 /* CZ |
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220 * This should round towards negative infinity because |
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221 * Thomas R. Nicely used GMP's mpz_fdiv_q_2exp(). |
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222 * But mp_div_2() does not do so, it is truncating instead. |
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223 */ |
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224 oddness = MP_IS_ODD(&Uz) ? MP_YES : MP_NO; |
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225 if ((err = mp_div_2(&Uz, &Uz)) != MP_OKAY) goto LBL_LS_ERR; |
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226 if ((Uz.sign == MP_NEG) && (oddness != MP_NO)) { |
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227 if ((err = mp_sub_d(&Uz, 1uL, &Uz)) != MP_OKAY) goto LBL_LS_ERR; |
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228 } |
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229 if ((err = mp_add(&T3z, &T4z, &Vz)) != MP_OKAY) goto LBL_LS_ERR; |
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230 if (MP_IS_ODD(&Vz)) { |
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231 if ((err = mp_add(&Vz, a, &Vz)) != MP_OKAY) goto LBL_LS_ERR; |
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232 } |
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233 oddness = MP_IS_ODD(&Vz) ? MP_YES : MP_NO; |
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234 if ((err = mp_div_2(&Vz, &Vz)) != MP_OKAY) goto LBL_LS_ERR; |
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235 if ((Vz.sign == MP_NEG) && (oddness != MP_NO)) { |
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236 if ((err = mp_sub_d(&Vz, 1uL, &Vz)) != MP_OKAY) goto LBL_LS_ERR; |
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237 } |
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238 if ((err = mp_mod(&Uz, a, &Uz)) != MP_OKAY) goto LBL_LS_ERR; |
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Update LibTomMath to 1.2.0 (#84)
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239 if ((err = mp_mod(&Vz, a, &Vz)) != MP_OKAY) goto LBL_LS_ERR; |
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Update LibTomMath to 1.2.0 (#84)
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240 |
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241 /* Calculating Q^d for later use */ |
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242 if ((err = mp_mul(&Qkdz, &Qmz, &Qkdz)) != MP_OKAY) goto LBL_LS_ERR; |
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Update LibTomMath to 1.2.0 (#84)
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243 if ((err = mp_mod(&Qkdz, a, &Qkdz)) != MP_OKAY) goto LBL_LS_ERR; |
1655
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244 } |
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245 } |
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246 |
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247 /* If U_d or V_d is congruent to 0 mod N, then N is a prime or a |
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248 strong Lucas pseudoprime. */ |
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249 if (MP_IS_ZERO(&Uz) || MP_IS_ZERO(&Vz)) { |
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250 *result = MP_YES; |
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251 goto LBL_LS_ERR; |
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252 } |
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253 |
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254 /* NOTE: Ribenboim ("The new book of prime number records," 3rd ed., |
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255 1995/6) omits the condition V0 on p.142, but includes it on |
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256 p. 130. The condition is NECESSARY; otherwise the test will |
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257 return false negatives---e.g., the primes 29 and 2000029 will be |
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258 returned as composite. */ |
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259 |
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260 /* Otherwise, we must compute V_2d, V_4d, V_8d, ..., V_{2^(s-1)*d} |
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261 by repeated use of the formula V_2m = V_m*V_m - 2*Q^m. If any of |
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262 these are congruent to 0 mod N, then N is a prime or a strong |
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263 Lucas pseudoprime. */ |
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264 |
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|
265 /* Initialize 2*Q^(d*2^r) for V_2m */ |
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266 if ((err = mp_mul_2(&Qkdz, &Q2kdz)) != MP_OKAY) goto LBL_LS_ERR; |
1655
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267 |
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268 for (r = 1; r < s; r++) { |
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Update LibTomMath to 1.2.0 (#84)
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269 if ((err = mp_sqr(&Vz, &Vz)) != MP_OKAY) goto LBL_LS_ERR; |
1051e4eea25a
Update LibTomMath to 1.2.0 (#84)
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270 if ((err = mp_sub(&Vz, &Q2kdz, &Vz)) != MP_OKAY) goto LBL_LS_ERR; |
1051e4eea25a
Update LibTomMath to 1.2.0 (#84)
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271 if ((err = mp_mod(&Vz, a, &Vz)) != MP_OKAY) goto LBL_LS_ERR; |
1051e4eea25a
Update LibTomMath to 1.2.0 (#84)
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272 if (MP_IS_ZERO(&Vz)) { |
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273 *result = MP_YES; |
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274 goto LBL_LS_ERR; |
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275 } |
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276 /* Calculate Q^{d*2^r} for next r (final iteration irrelevant). */ |
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277 if (r < (s - 1)) { |
1692
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278 if ((err = mp_sqr(&Qkdz, &Qkdz)) != MP_OKAY) goto LBL_LS_ERR; |
1051e4eea25a
Update LibTomMath to 1.2.0 (#84)
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279 if ((err = mp_mod(&Qkdz, a, &Qkdz)) != MP_OKAY) goto LBL_LS_ERR; |
1051e4eea25a
Update LibTomMath to 1.2.0 (#84)
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280 if ((err = mp_mul_2(&Qkdz, &Q2kdz)) != MP_OKAY) goto LBL_LS_ERR; |
1655
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|
281 } |
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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282 } |
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
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283 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
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284 mp_clear_multi(&Q2kdz, &T4z, &T3z, &T2z, &T1z, &Qkdz, &Q2mz, &Qmz, &V2mz, &U2mz, &Vz, &Uz, &Np1, &gcd, &Dz, NULL); |
1692
1051e4eea25a
Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents:
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285 return err; |
1655
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:
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287 #endif |
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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288 #endif |
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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289 #endif |