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annotate src/pk/dsa/dsa_sign_hash.c @ 191:1c15b283127b libtomcrypt-orig

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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
author Matt Johnston <matt@ucc.asn.au>
date Fri, 06 May 2005 13:23:02 +0000
parents
children 39d5d58461d6
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191
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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2 *
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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3 * LibTomCrypt is a library that provides various cryptographic
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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4 * algorithms in a highly modular and flexible manner.
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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5 *
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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6 * The library is free for all purposes without any express
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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7 * guarantee it works.
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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8 *
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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9 * Tom St Denis, [email protected], http://libtomcrypt.org
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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10 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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11 #include "tomcrypt.h"
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12
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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13 /**
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14 @file dsa_sign_hash.c
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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15 DSA implementation, sign a hash, Tom St Denis
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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16 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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17
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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18 #ifdef MDSA
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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19
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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20 /**
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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21 Sign a hash with DSA
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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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
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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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
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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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 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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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)
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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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; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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64
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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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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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; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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76
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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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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79
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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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; }
1c15b283127b 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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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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92
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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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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Matt Johnston <matt@ucc.asn.au>
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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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parents:
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97 if ((err = mp_mulmod(&s, &kinv, &key->q, &s)) != MP_OKAY) { goto error; }
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parents:
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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;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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108 goto LBL_ERR;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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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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117 LBL_ERR:
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118 mp_clear_multi(&k, &kinv, &r, &s, &tmp, NULL);
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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