Mercurial > dropbear

annotate src/pk/dsa/dsa_make_key.c @ 222:36160290a1b2 libtomcrypt LTC_DB_0.46

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* change include path of options.h * don't use the constant ROL/ROR operations, since compilers seem to have problems
author Matt Johnston <matt@ucc.asn.au>
date Fri, 08 Jul 2005 19:13:24 +0000
parents 39d5d58461d6
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
191
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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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
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4 * algorithms in a highly modular and flexible manner.
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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.
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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_make_key.c
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15 DSA implementation, generate a DSA key, 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 Create a DSA key
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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22 @param prng An active PRNG state
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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23 @param wprng The index of the PRNG desired
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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24 @param group_size Size of the multiplicative group (octets)
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25 @param modulus_size Size of the modulus (octets)
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26 @param key [out] Where to store the created key
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27 @return CRYPT_OK if successful, upon error this function will free all allocated memory
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28 */
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29 int dsa_make_key(prng_state *prng, int wprng, int group_size, int modulus_size, dsa_key *key)
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30 {
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31 mp_int tmp, tmp2;
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32 int err, res;
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33 unsigned char *buf;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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34
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35 LTC_ARGCHK(key != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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36
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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37 /* check prng */
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38 if ((err = prng_is_valid(wprng)) != CRYPT_OK) {
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39 return err;
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40 }
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41
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42 /* check size */
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43 if (group_size >= MDSA_MAX_GROUP || group_size <= 15 ||
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44 group_size >= modulus_size || (modulus_size - group_size) >= MDSA_DELTA) {
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45 return CRYPT_INVALID_ARG;
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46 }
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47
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48 /* allocate ram */
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49 buf = XMALLOC(MDSA_DELTA);
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50 if (buf == NULL) {
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51 return CRYPT_MEM;
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52 }
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53
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54 /* init mp_ints */
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55 if ((err = mp_init_multi(&tmp, &tmp2, &key->g, &key->q, &key->p, &key->x, &key->y, NULL)) != MP_OKAY) {
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56 err = mpi_to_ltc_error(err);
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57 goto LBL_ERR;
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58 }
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59
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60 /* make our prime q */
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61 if ((err = rand_prime(&key->q, group_size*8, prng, wprng)) != CRYPT_OK) { goto LBL_ERR; }
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62
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63 /* double q */
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64 if ((err = mp_mul_2(&key->q, &tmp)) != MP_OKAY) { goto error; }
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65
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66 /* now make a random string and multply it against q */
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67 if (prng_descriptor[wprng].read(buf+1, modulus_size - group_size, prng) != (unsigned long)(modulus_size - group_size)) {
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68 err = CRYPT_ERROR_READPRNG;
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69 goto LBL_ERR;
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70 }
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71
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72 /* force magnitude */
209
39d5d58461d6 Import of libtomcrypt 1.05
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73 buf[0] |= 0xC0;
191
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74
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75 /* force even */
209
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76 buf[modulus_size - group_size - 1] &= ~1;
191
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77
209
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78 if ((err = mp_read_unsigned_bin(&tmp2, buf, modulus_size - group_size)) != MP_OKAY) { goto error; }
191
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79 if ((err = mp_mul(&key->q, &tmp2, &key->p)) != MP_OKAY) { goto error; }
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80 if ((err = mp_add_d(&key->p, 1, &key->p)) != MP_OKAY) { goto error; }
209
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81
191
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82 /* now loop until p is prime */
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83 for (;;) {
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84 if ((err = is_prime(&key->p, &res)) != CRYPT_OK) { goto LBL_ERR; }
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85 if (res == MP_YES) break;
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86
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87 /* add 2q to p and 2 to tmp2 */
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88 if ((err = mp_add(&tmp, &key->p, &key->p)) != MP_OKAY) { goto error; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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89 if ((err = mp_add_d(&tmp2, 2, &tmp2)) != MP_OKAY) { goto error; }
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90 }
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91
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92 /* now p = (q * tmp2) + 1 is prime, find a value g for which g^tmp2 != 1 */
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93 mp_set(&key->g, 1);
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94
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95 do {
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96 if ((err = mp_add_d(&key->g, 1, &key->g)) != MP_OKAY) { goto error; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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97 if ((err = mp_exptmod(&key->g, &tmp2, &key->p, &tmp)) != MP_OKAY) { goto error; }
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98 } while (mp_cmp_d(&tmp, 1) == MP_EQ);
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99
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100 /* at this point tmp generates a group of order q mod p */
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101 mp_exch(&tmp, &key->g);
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102
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103 /* so now we have our DH structure, generator g, order q, modulus p
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104 Now we need a random exponent [mod q] and it's power g^x mod p
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105 */
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106 do {
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107 if (prng_descriptor[wprng].read(buf, group_size, prng) != (unsigned long)group_size) {
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108 err = CRYPT_ERROR_READPRNG;
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109 goto LBL_ERR;
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110 }
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111 if ((err = mp_read_unsigned_bin(&key->x, buf, group_size)) != MP_OKAY) { goto error; }
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112 } while (mp_cmp_d(&key->x, 1) != MP_GT);
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113 if ((err = mp_exptmod(&key->g, &key->x, &key->p, &key->y)) != MP_OKAY) { goto error; }
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114
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115 key->type = PK_PRIVATE;
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116 key->qord = group_size;
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117
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118 /* shrink the ram required */
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119 if ((err = mp_shrink(&key->g)) != MP_OKAY) { goto error; }
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120 if ((err = mp_shrink(&key->p)) != MP_OKAY) { goto error; }
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121 if ((err = mp_shrink(&key->q)) != MP_OKAY) { goto error; }
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122 if ((err = mp_shrink(&key->x)) != MP_OKAY) { goto error; }
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123 if ((err = mp_shrink(&key->y)) != MP_OKAY) { goto error; }
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124
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125 #ifdef LTC_CLEAN_STACK
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126 zeromem(buf, MDSA_DELTA);
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127 #endif
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128
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129 err = CRYPT_OK;
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130 goto done;
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131 error:
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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132 err = mpi_to_ltc_error(err);
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133 LBL_ERR:
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134 mp_clear_multi(&key->g, &key->q, &key->p, &key->x, &key->y, NULL);
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135 done:
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136 mp_clear_multi(&tmp, &tmp2, NULL);
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137
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138 XFREE(buf);
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139 return err;
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140 }
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141
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142 #endif
209
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143
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144 /* $Source: /cvs/libtom/libtomcrypt/src/pk/dsa/dsa_make_key.c,v $ */
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145 /* $Revision: 1.4 $ */
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146 /* $Date: 2005/06/11 05:45:35 $ */