Mercurial > dropbear
annotate libtommath/bn_deprecated.c @ 1788:1fc0012b9c38
Fix handling of replies to global requests (#112)
The current code assumes that all global requests want / need a reply.
This isn't always true and the request itself indicates if it wants a
reply or not.
It causes a specific problem with [email protected] messages.
These are sent by OpenSSH after authentication to inform the client of
potential other host keys for the host. This can be used to add a new
type of host key or to rotate host keys.
The initial information message from the server is sent as a global
request, but with want_reply set to false. This means that the server
doesn't expect an answer to this message. Instead the client needs to
send a prove request as a reply if it wants to receive proof of
ownership for the host keys.
The bug doesn't cause any current problems with due to how OpenSSH
treats receiving the failure message. It instead treats it as a
keepalive message and further ignores it.
Arguably this is a protocol violation though of Dropbear and it is only
accidental that it doesn't cause a problem with OpenSSH.
The bug was found when adding host keys support to libssh, which is more
strict protocol wise and treats the unexpected failure message an error,
also see https://gitlab.com/libssh/libssh-mirror/-/merge_requests/145
for more information.
The fix here is to honor the want_reply flag in the global request and
to only send a reply if the other side expects a reply.
author | Dirkjan Bussink <d.bussink@gmail.com> |
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date | Thu, 10 Dec 2020 16:13:13 +0100 |
parents | 1051e4eea25a |
children |
rev | line source |
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1692
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1 #include "tommath_private.h" |
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2 #ifdef BN_DEPRECATED_C |
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */ |
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4 /* SPDX-License-Identifier: Unlicense */ |
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5 |
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6 #ifdef BN_MP_GET_BIT_C |
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7 int mp_get_bit(const mp_int *a, int b) |
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8 { |
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9 if (b < 0) { |
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10 return MP_VAL; |
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11 } |
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12 return (s_mp_get_bit(a, (unsigned int)b) == MP_YES) ? MP_YES : MP_NO; |
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13 } |
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14 #endif |
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15 #ifdef BN_MP_JACOBI_C |
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16 mp_err mp_jacobi(const mp_int *a, const mp_int *n, int *c) |
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17 { |
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18 if (a->sign == MP_NEG) { |
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19 return MP_VAL; |
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20 } |
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21 if (mp_cmp_d(n, 0uL) != MP_GT) { |
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22 return MP_VAL; |
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23 } |
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24 return mp_kronecker(a, n, c); |
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25 } |
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26 #endif |
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27 #ifdef BN_MP_PRIME_RANDOM_EX_C |
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28 mp_err mp_prime_random_ex(mp_int *a, int t, int size, int flags, private_mp_prime_callback cb, void *dat) |
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29 { |
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30 return s_mp_prime_random_ex(a, t, size, flags, cb, dat); |
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31 } |
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32 #endif |
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33 #ifdef BN_MP_RAND_DIGIT_C |
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34 mp_err mp_rand_digit(mp_digit *r) |
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35 { |
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36 mp_err err = s_mp_rand_source(r, sizeof(mp_digit)); |
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37 *r &= MP_MASK; |
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38 return err; |
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39 } |
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40 #endif |
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41 #ifdef BN_FAST_MP_INVMOD_C |
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42 mp_err fast_mp_invmod(const mp_int *a, const mp_int *b, mp_int *c) |
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43 { |
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44 return s_mp_invmod_fast(a, b, c); |
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45 } |
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46 #endif |
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47 #ifdef BN_FAST_MP_MONTGOMERY_REDUCE_C |
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48 mp_err fast_mp_montgomery_reduce(mp_int *x, const mp_int *n, mp_digit rho) |
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49 { |
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50 return s_mp_montgomery_reduce_fast(x, n, rho); |
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51 } |
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52 #endif |
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53 #ifdef BN_FAST_S_MP_MUL_DIGS_C |
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54 mp_err fast_s_mp_mul_digs(const mp_int *a, const mp_int *b, mp_int *c, int digs) |
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55 { |
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56 return s_mp_mul_digs_fast(a, b, c, digs); |
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57 } |
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58 #endif |
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59 #ifdef BN_FAST_S_MP_MUL_HIGH_DIGS_C |
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60 mp_err fast_s_mp_mul_high_digs(const mp_int *a, const mp_int *b, mp_int *c, int digs) |
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61 { |
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62 return s_mp_mul_high_digs_fast(a, b, c, digs); |
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63 } |
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64 #endif |
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65 #ifdef BN_FAST_S_MP_SQR_C |
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66 mp_err fast_s_mp_sqr(const mp_int *a, mp_int *b) |
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67 { |
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68 return s_mp_sqr_fast(a, b); |
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69 } |
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70 #endif |
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71 #ifdef BN_MP_BALANCE_MUL_C |
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72 mp_err mp_balance_mul(const mp_int *a, const mp_int *b, mp_int *c) |
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73 { |
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74 return s_mp_balance_mul(a, b, c); |
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75 } |
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76 #endif |
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77 #ifdef BN_MP_EXPTMOD_FAST_C |
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78 mp_err mp_exptmod_fast(const mp_int *G, const mp_int *X, const mp_int *P, mp_int *Y, int redmode) |
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79 { |
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80 return s_mp_exptmod_fast(G, X, P, Y, redmode); |
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81 } |
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82 #endif |
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83 #ifdef BN_MP_INVMOD_SLOW_C |
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84 mp_err mp_invmod_slow(const mp_int *a, const mp_int *b, mp_int *c) |
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85 { |
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86 return s_mp_invmod_slow(a, b, c); |
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87 } |
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88 #endif |
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89 #ifdef BN_MP_KARATSUBA_MUL_C |
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90 mp_err mp_karatsuba_mul(const mp_int *a, const mp_int *b, mp_int *c) |
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91 { |
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92 return s_mp_karatsuba_mul(a, b, c); |
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93 } |
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94 #endif |
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95 #ifdef BN_MP_KARATSUBA_SQR_C |
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96 mp_err mp_karatsuba_sqr(const mp_int *a, mp_int *b) |
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97 { |
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98 return s_mp_karatsuba_sqr(a, b); |
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99 } |
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100 #endif |
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101 #ifdef BN_MP_TOOM_MUL_C |
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102 mp_err mp_toom_mul(const mp_int *a, const mp_int *b, mp_int *c) |
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103 { |
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104 return s_mp_toom_mul(a, b, c); |
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105 } |
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106 #endif |
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107 #ifdef BN_MP_TOOM_SQR_C |
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108 mp_err mp_toom_sqr(const mp_int *a, mp_int *b) |
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109 { |
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110 return s_mp_toom_sqr(a, b); |
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111 } |
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112 #endif |
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113 #ifdef S_MP_REVERSE_C |
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114 void bn_reverse(unsigned char *s, int len) |
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115 { |
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116 if (len > 0) { |
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117 s_mp_reverse(s, (size_t)len); |
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118 } |
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119 } |
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120 #endif |
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121 #ifdef BN_MP_TC_AND_C |
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122 mp_err mp_tc_and(const mp_int *a, const mp_int *b, mp_int *c) |
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123 { |
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124 return mp_and(a, b, c); |
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125 } |
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126 #endif |
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127 #ifdef BN_MP_TC_OR_C |
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128 mp_err mp_tc_or(const mp_int *a, const mp_int *b, mp_int *c) |
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129 { |
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130 return mp_or(a, b, c); |
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131 } |
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132 #endif |
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133 #ifdef BN_MP_TC_XOR_C |
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134 mp_err mp_tc_xor(const mp_int *a, const mp_int *b, mp_int *c) |
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135 { |
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136 return mp_xor(a, b, c); |
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137 } |
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138 #endif |
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139 #ifdef BN_MP_TC_DIV_2D_C |
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140 mp_err mp_tc_div_2d(const mp_int *a, int b, mp_int *c) |
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141 { |
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142 return mp_signed_rsh(a, b, c); |
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143 } |
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144 #endif |
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145 #ifdef BN_MP_INIT_SET_INT_C |
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146 mp_err mp_init_set_int(mp_int *a, unsigned long b) |
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147 { |
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148 return mp_init_u32(a, (uint32_t)b); |
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149 } |
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150 #endif |
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151 #ifdef BN_MP_SET_INT_C |
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152 mp_err mp_set_int(mp_int *a, unsigned long b) |
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153 { |
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154 mp_set_u32(a, (uint32_t)b); |
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155 return MP_OKAY; |
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156 } |
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157 #endif |
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158 #ifdef BN_MP_SET_LONG_C |
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159 mp_err mp_set_long(mp_int *a, unsigned long b) |
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160 { |
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161 mp_set_u64(a, b); |
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162 return MP_OKAY; |
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163 } |
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164 #endif |
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165 #ifdef BN_MP_SET_LONG_LONG_C |
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166 mp_err mp_set_long_long(mp_int *a, unsigned long long b) |
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167 { |
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168 mp_set_u64(a, b); |
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169 return MP_OKAY; |
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170 } |
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171 #endif |
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172 #ifdef BN_MP_GET_INT_C |
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173 unsigned long mp_get_int(const mp_int *a) |
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174 { |
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175 return (unsigned long)mp_get_mag_u32(a); |
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176 } |
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177 #endif |
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178 #ifdef BN_MP_GET_LONG_C |
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179 unsigned long mp_get_long(const mp_int *a) |
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180 { |
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181 return (unsigned long)mp_get_mag_ul(a); |
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182 } |
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183 #endif |
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184 #ifdef BN_MP_GET_LONG_LONG_C |
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185 unsigned long long mp_get_long_long(const mp_int *a) |
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186 { |
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187 return mp_get_mag_ull(a); |
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188 } |
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189 #endif |
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190 #ifdef BN_MP_PRIME_IS_DIVISIBLE_C |
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191 mp_err mp_prime_is_divisible(const mp_int *a, mp_bool *result) |
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192 { |
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193 return s_mp_prime_is_divisible(a, result); |
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194 } |
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195 #endif |
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196 #ifdef BN_MP_EXPT_D_EX_C |
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197 mp_err mp_expt_d_ex(const mp_int *a, mp_digit b, mp_int *c, int fast) |
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198 { |
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199 (void)fast; |
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200 if (b > MP_MIN(MP_DIGIT_MAX, UINT32_MAX)) { |
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201 return MP_VAL; |
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202 } |
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203 return mp_expt_u32(a, (uint32_t)b, c); |
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204 } |
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205 #endif |
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206 #ifdef BN_MP_EXPT_D_C |
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207 mp_err mp_expt_d(const mp_int *a, mp_digit b, mp_int *c) |
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208 { |
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209 if (b > MP_MIN(MP_DIGIT_MAX, UINT32_MAX)) { |
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210 return MP_VAL; |
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211 } |
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212 return mp_expt_u32(a, (uint32_t)b, c); |
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213 } |
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214 #endif |
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215 #ifdef BN_MP_N_ROOT_EX_C |
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216 mp_err mp_n_root_ex(const mp_int *a, mp_digit b, mp_int *c, int fast) |
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217 { |
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218 (void)fast; |
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219 if (b > MP_MIN(MP_DIGIT_MAX, UINT32_MAX)) { |
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220 return MP_VAL; |
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221 } |
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222 return mp_root_u32(a, (uint32_t)b, c); |
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223 } |
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224 #endif |
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225 #ifdef BN_MP_N_ROOT_C |
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226 mp_err mp_n_root(const mp_int *a, mp_digit b, mp_int *c) |
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227 { |
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228 if (b > MP_MIN(MP_DIGIT_MAX, UINT32_MAX)) { |
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229 return MP_VAL; |
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230 } |
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231 return mp_root_u32(a, (uint32_t)b, c); |
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232 } |
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233 #endif |
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234 #ifdef BN_MP_UNSIGNED_BIN_SIZE_C |
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235 int mp_unsigned_bin_size(const mp_int *a) |
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236 { |
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237 return (int)mp_ubin_size(a); |
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238 } |
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239 #endif |
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240 #ifdef BN_MP_READ_UNSIGNED_BIN_C |
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241 mp_err mp_read_unsigned_bin(mp_int *a, const unsigned char *b, int c) |
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242 { |
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243 return mp_from_ubin(a, b, (size_t) c); |
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244 } |
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245 #endif |
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246 #ifdef BN_MP_TO_UNSIGNED_BIN_C |
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247 mp_err mp_to_unsigned_bin(const mp_int *a, unsigned char *b) |
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248 { |
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249 return mp_to_ubin(a, b, SIZE_MAX, NULL); |
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250 } |
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251 #endif |
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252 #ifdef BN_MP_TO_UNSIGNED_BIN_N_C |
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253 mp_err mp_to_unsigned_bin_n(const mp_int *a, unsigned char *b, unsigned long *outlen) |
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254 { |
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255 size_t n = mp_ubin_size(a); |
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256 if (*outlen < (unsigned long)n) { |
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257 return MP_VAL; |
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258 } |
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259 *outlen = (unsigned long)n; |
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260 return mp_to_ubin(a, b, n, NULL); |
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261 } |
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262 #endif |
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263 #ifdef BN_MP_SIGNED_BIN_SIZE_C |
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264 int mp_signed_bin_size(const mp_int *a) |
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265 { |
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266 return (int)mp_sbin_size(a); |
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267 } |
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268 #endif |
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269 #ifdef BN_MP_READ_SIGNED_BIN_C |
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270 mp_err mp_read_signed_bin(mp_int *a, const unsigned char *b, int c) |
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271 { |
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272 return mp_from_sbin(a, b, (size_t) c); |
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273 } |
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274 #endif |
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275 #ifdef BN_MP_TO_SIGNED_BIN_C |
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276 mp_err mp_to_signed_bin(const mp_int *a, unsigned char *b) |
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277 { |
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278 return mp_to_sbin(a, b, SIZE_MAX, NULL); |
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279 } |
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280 #endif |
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281 #ifdef BN_MP_TO_SIGNED_BIN_N_C |
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282 mp_err mp_to_signed_bin_n(const mp_int *a, unsigned char *b, unsigned long *outlen) |
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283 { |
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284 size_t n = mp_sbin_size(a); |
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285 if (*outlen < (unsigned long)n) { |
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286 return MP_VAL; |
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287 } |
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288 *outlen = (unsigned long)n; |
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289 return mp_to_sbin(a, b, n, NULL); |
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290 } |
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291 #endif |
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292 #ifdef BN_MP_TORADIX_N_C |
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293 mp_err mp_toradix_n(const mp_int *a, char *str, int radix, int maxlen) |
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294 { |
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295 if (maxlen < 0) { |
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296 return MP_VAL; |
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297 } |
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298 return mp_to_radix(a, str, (size_t)maxlen, NULL, radix); |
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299 } |
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300 #endif |
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301 #ifdef BN_MP_TORADIX_C |
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302 mp_err mp_toradix(const mp_int *a, char *str, int radix) |
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303 { |
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304 return mp_to_radix(a, str, SIZE_MAX, NULL, radix); |
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305 } |
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306 #endif |
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307 #ifdef BN_MP_IMPORT_C |
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308 mp_err mp_import(mp_int *rop, size_t count, int order, size_t size, int endian, size_t nails, |
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309 const void *op) |
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310 { |
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311 return mp_unpack(rop, count, order, size, endian, nails, op); |
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312 } |
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313 #endif |
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314 #ifdef BN_MP_EXPORT_C |
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315 mp_err mp_export(void *rop, size_t *countp, int order, size_t size, |
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316 int endian, size_t nails, const mp_int *op) |
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317 { |
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318 return mp_pack(rop, SIZE_MAX, countp, order, size, endian, nails, op); |
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319 } |
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320 #endif |
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321 #endif |