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annotate dsa_sign_hash.c @ 89:cecb105ff479 libtomcrypt

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Fix for big-endian load/store macros
author Matt Johnston <matt@ucc.asn.au>
date Fri, 03 Sep 2004 08:31:12 +0000
parents d7da3b1e1540
children 5d99163f7e32
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0
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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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 "mycrypt.h"
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12
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13 #ifdef MDSA
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14
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15 int dsa_sign_hash(const unsigned char *in, unsigned long inlen,
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16 unsigned char *out, unsigned long *outlen,
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17 prng_state *prng, int wprng, dsa_key *key)
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18 {
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19 mp_int k, kinv, tmp, r, s;
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20 unsigned char buf[512];
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21 int err, y;
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22 unsigned long len;
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23
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24
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25 _ARGCHK(in != NULL);
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26 _ARGCHK(out != NULL);
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27 _ARGCHK(outlen != NULL);
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28 _ARGCHK(key != NULL);
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29
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30 if ((err = prng_is_valid(wprng)) != CRYPT_OK) {
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31 return err;
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32 }
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33 if (key->type != PK_PRIVATE) {
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34 return CRYPT_PK_NOT_PRIVATE;
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35 }
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36
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37 /* check group order size */
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38 if (key->qord >= (int)sizeof(buf)) {
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39 return CRYPT_INVALID_ARG;
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40 }
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41
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42 /* Init our temps */
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43 if ((err = mp_init_multi(&k, &kinv, &r, &s, &tmp, NULL)) != MP_OKAY) { goto error; }
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44
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45 retry:
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46
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47 do {
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48 /* gen random k */
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49 if (prng_descriptor[wprng].read(buf, key->qord, prng) != (unsigned long)key->qord) {
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50 err = CRYPT_ERROR_READPRNG;
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51 goto done;
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52 }
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53
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54 /* read k */
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55 if ((err = mp_read_unsigned_bin(&k, buf, key->qord)) != MP_OKAY) { goto error; }
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56
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57 /* k > 1 ? */
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58 if (mp_cmp_d(&k, 1) != MP_GT) { goto retry; }
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59
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60 /* test gcd */
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61 if ((err = mp_gcd(&k, &key->q, &tmp)) != MP_OKAY) { goto error; }
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62 } while (mp_cmp_d(&tmp, 1) != MP_EQ);
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63
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64 /* now find 1/k mod q */
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65 if ((err = mp_invmod(&k, &key->q, &kinv)) != MP_OKAY) { goto error; }
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66
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67 /* now find r = g^k mod p mod q */
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68 if ((err = mp_exptmod(&key->g, &k, &key->p, &r)) != MP_OKAY) { goto error; }
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69 if ((err = mp_mod(&r, &key->q, &r)) != MP_OKAY) { goto error; }
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70
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71 if (mp_iszero(&r) == MP_YES) { goto retry; }
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72
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73 /* now find s = (in + xr)/k mod q */
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74 if ((err = mp_read_unsigned_bin(&tmp, (unsigned char *)in, inlen)) != MP_OKAY) { goto error; }
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75 if ((err = mp_mul(&key->x, &r, &s)) != MP_OKAY) { goto error; }
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76 if ((err = mp_add(&s, &tmp, &s)) != MP_OKAY) { goto error; }
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77 if ((err = mp_mulmod(&s, &kinv, &key->q, &s)) != MP_OKAY) { goto error; }
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78
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79 if (mp_iszero(&s) == MP_YES) { goto retry; }
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80
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81 /* now store em both */
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82
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83 /* first check that we have enough room */
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84 if (*outlen < (unsigned long)(PACKET_SIZE + 4 + mp_unsigned_bin_size(&s) + mp_unsigned_bin_size(&r))) {
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85 err = CRYPT_BUFFER_OVERFLOW;
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86 goto done;
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87 }
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88
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89 /* packet header */
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90 packet_store_header(out, PACKET_SECT_DSA, PACKET_SUB_SIGNED);
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91 y = PACKET_SIZE;
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92
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93 /* store length of r */
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94 len = mp_unsigned_bin_size(&r);
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95 out[y++] = (len>>8)&255;
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96 out[y++] = len&255;
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97
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98 /* store r */
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99 if ((err = mp_to_unsigned_bin(&r, out+y)) != MP_OKAY) { goto error; }
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100 y += len;
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101
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102 /* store length of s */
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103 len = mp_unsigned_bin_size(&s);
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104 out[y++] = (len>>8)&255;
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105 out[y++] = len&255;
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106
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107 /* store s */
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108 if ((err = mp_to_unsigned_bin(&s, out+y)) != MP_OKAY) { goto error; }
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109 y += len;
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110
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111 /* reset size */
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112 *outlen = y;
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113
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114 err = CRYPT_OK;
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115 goto done;
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116
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117 error : err = mpi_to_ltc_error(err);
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118 done : mp_clear_multi(&k, &kinv, &r, &s, &tmp, NULL);
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119 #ifdef CLEAN_STACK
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120 zeromem(buf, sizeof(buf));
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121 #endif
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122 return err;
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123 }
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124
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125 #endif