Mercurial > dropbear
annotate src/pk/dsa/dsa_sign_hash.c @ 191:1c15b283127b libtomcrypt-orig
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 06 May 2005 13:23:02 +0000 |
parents | |
children | 39d5d58461d6 |
rev | line source |
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191
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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2 * |
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3 * LibTomCrypt is a library that provides various cryptographic |
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4 * algorithms in a highly modular and flexible manner. |
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5 * |
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6 * The library is free for all purposes without any express |
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7 * guarantee it works. |
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8 * |
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9 * Tom St Denis, [email protected], http://libtomcrypt.org |
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10 */ |
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11 #include "tomcrypt.h" |
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12 |
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13 /** |
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14 @file dsa_sign_hash.c |
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15 DSA implementation, sign a hash, Tom St Denis |
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16 */ |
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17 |
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18 #ifdef MDSA |
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19 |
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20 /** |
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21 Sign a hash with DSA |
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22 @param in The hash to sign |
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23 @param inlen The length of the hash to sign |
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24 @param out [out] Where to store the signature |
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25 @param outlen [in/out] The max size and resulting size of the signature |
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26 @param prng An active PRNG state |
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27 @param wprng The index of the PRNG desired |
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28 @param key A private DSA key |
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29 @return CRYPT_OK if successful |
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30 */ |
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31 int dsa_sign_hash(const unsigned char *in, unsigned long inlen, |
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32 unsigned char *out, unsigned long *outlen, |
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33 prng_state *prng, int wprng, dsa_key *key) |
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34 { |
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35 mp_int k, kinv, tmp, r, s; |
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36 unsigned char *buf; |
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37 int err; |
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38 unsigned long out1, out2; |
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39 |
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40 LTC_ARGCHK(in != NULL); |
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41 LTC_ARGCHK(out != NULL); |
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42 LTC_ARGCHK(outlen != NULL); |
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43 LTC_ARGCHK(key != NULL); |
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44 |
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45 if ((err = prng_is_valid(wprng)) != CRYPT_OK) { |
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46 return err; |
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47 } |
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48 if (key->type != PK_PRIVATE) { |
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49 return CRYPT_PK_NOT_PRIVATE; |
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50 } |
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51 |
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52 /* check group order size */ |
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53 if (key->qord >= MDSA_MAX_GROUP) { |
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54 return CRYPT_INVALID_ARG; |
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55 } |
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56 |
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57 buf = XMALLOC(MDSA_MAX_GROUP); |
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58 if (buf == NULL) { |
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59 return CRYPT_MEM; |
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60 } |
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61 |
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62 /* Init our temps */ |
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63 if ((err = mp_init_multi(&k, &kinv, &r, &s, &tmp, NULL)) != MP_OKAY) { goto error; } |
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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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64 |
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65 retry: |
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66 |
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67 do { |
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68 /* gen random k */ |
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69 if (prng_descriptor[wprng].read(buf, key->qord, prng) != (unsigned long)key->qord) { |
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70 err = CRYPT_ERROR_READPRNG; |
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71 goto LBL_ERR; |
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72 } |
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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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73 |
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74 /* read k */ |
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75 if ((err = mp_read_unsigned_bin(&k, buf, key->qord)) != MP_OKAY) { goto error; } |
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76 |
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77 /* k > 1 ? */ |
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78 if (mp_cmp_d(&k, 1) != MP_GT) { goto retry; } |
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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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79 |
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80 /* test gcd */ |
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81 if ((err = mp_gcd(&k, &key->q, &tmp)) != MP_OKAY) { goto error; } |
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82 } while (mp_cmp_d(&tmp, 1) != MP_EQ); |
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83 |
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84 /* now find 1/k mod q */ |
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85 if ((err = mp_invmod(&k, &key->q, &kinv)) != MP_OKAY) { goto error; } |
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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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86 |
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87 /* now find r = g^k mod p mod q */ |
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88 if ((err = mp_exptmod(&key->g, &k, &key->p, &r)) != MP_OKAY) { goto error; } |
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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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89 if ((err = mp_mod(&r, &key->q, &r)) != MP_OKAY) { goto error; } |
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90 |
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91 if (mp_iszero(&r) == MP_YES) { goto retry; } |
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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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92 |
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93 /* now find s = (in + xr)/k mod q */ |
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94 if ((err = mp_read_unsigned_bin(&tmp, (unsigned char *)in, inlen)) != MP_OKAY) { goto error; } |
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95 if ((err = mp_mul(&key->x, &r, &s)) != MP_OKAY) { goto error; } |
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96 if ((err = mp_add(&s, &tmp, &s)) != MP_OKAY) { goto error; } |
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97 if ((err = mp_mulmod(&s, &kinv, &key->q, &s)) != MP_OKAY) { goto error; } |
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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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98 |
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99 if (mp_iszero(&s) == MP_YES) { goto retry; } |
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100 |
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101 /* now store em both */ |
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102 |
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103 /* first check that we have enough room */ |
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104 if ((err = der_length_integer(&s, &out1)) != CRYPT_OK) { goto LBL_ERR; } |
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105 if ((err = der_length_integer(&r, &out2)) != CRYPT_OK) { goto LBL_ERR; } |
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106 if (*outlen < (out1+out2)) { |
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107 err = CRYPT_BUFFER_OVERFLOW; |
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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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108 goto LBL_ERR; |
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109 } |
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110 |
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111 /* store ints */ |
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112 err = der_put_multi_integer(out, outlen, &r, &s, NULL); |
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113 goto LBL_ERR; |
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114 |
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115 error: |
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116 err = mpi_to_ltc_error(err); |
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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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117 LBL_ERR: |
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118 mp_clear_multi(&k, &kinv, &r, &s, &tmp, NULL); |
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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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119 #ifdef LTC_CLEAN_STACK |
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120 zeromem(buf, MDSA_MAX_GROUP); |
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121 #endif |
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122 XFREE(buf); |
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123 return err; |
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124 } |
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125 |
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126 #endif |