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annotate src/pk/rsa/rsa_make_key.c @ 380:d5faf4814ddb libtomcrypt-orig libtomcrypt-1.16

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Update to LibTomCrypt 1.16
author Matt Johnston <matt@ucc.asn.au>
date Thu, 11 Jan 2007 02:22:00 +0000
parents 59400faa4b44
children
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rev   line source
280
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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2 *
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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3 * LibTomCrypt is a library that provides various cryptographic
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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4 * algorithms in a highly modular and flexible manner.
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5 *
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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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.com
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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 rsa_make_key.c
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15 RSA key generation, Tom St Denis
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16 */
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17
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18 #ifdef MRSA
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19
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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20 /**
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21 Create an RSA key
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22 @param prng An active PRNG state
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23 @param wprng The index of the PRNG desired
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24 @param size The size of the modulus (key size) desired (octets)
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25 @param e The "e" value (public key). e==65537 is a good choice
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26 @param key [out] Destination of a newly created private key pair
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27 @return CRYPT_OK if successful, upon error all allocated ram is freed
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28 */
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29 int rsa_make_key(prng_state *prng, int wprng, int size, long e, rsa_key *key)
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30 {
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31 void *p, *q, *tmp1, *tmp2, *tmp3;
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32 int err;
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33
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34 LTC_ARGCHK(ltc_mp.name != NULL);
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35 LTC_ARGCHK(key != NULL);
280
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36
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37 if ((size < (MIN_RSA_SIZE/8)) || (size > (MAX_RSA_SIZE/8))) {
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38 return CRYPT_INVALID_KEYSIZE;
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39 }
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40
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41 if ((e < 3) || ((e & 1) == 0)) {
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42 return CRYPT_INVALID_ARG;
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43 }
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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
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49 if ((err = mp_init_multi(&p, &q, &tmp1, &tmp2, &tmp3, NULL)) != CRYPT_OK) {
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50 return err;
280
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51 }
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52
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53 /* make primes p and q (optimization provided by Wayne Scott) */
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54 if ((err = mp_set_int(tmp3, e)) != CRYPT_OK) { goto errkey; } /* tmp3 = e */
280
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55
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56 /* make prime "p" */
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57 do {
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58 if ((err = rand_prime( p, size/2, prng, wprng)) != CRYPT_OK) { goto errkey; }
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59 if ((err = mp_sub_d( p, 1, tmp1)) != CRYPT_OK) { goto errkey; } /* tmp1 = p-1 */
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60 if ((err = mp_gcd( tmp1, tmp3, tmp2)) != CRYPT_OK) { goto errkey; } /* tmp2 = gcd(p-1, e) */
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61 } while (mp_cmp_d( tmp2, 1) != 0); /* while e divides p-1 */
280
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62
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63 /* make prime "q" */
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64 do {
380
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65 if ((err = rand_prime( q, size/2, prng, wprng)) != CRYPT_OK) { goto errkey; }
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66 if ((err = mp_sub_d( q, 1, tmp1)) != CRYPT_OK) { goto errkey; } /* tmp1 = q-1 */
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67 if ((err = mp_gcd( tmp1, tmp3, tmp2)) != CRYPT_OK) { goto errkey; } /* tmp2 = gcd(q-1, e) */
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68 } while (mp_cmp_d( tmp2, 1) != 0); /* while e divides q-1 */
280
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69
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70 /* tmp1 = lcm(p-1, q-1) */
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71 if ((err = mp_sub_d( p, 1, tmp2)) != CRYPT_OK) { goto errkey; } /* tmp2 = p-1 */
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72 /* tmp1 = q-1 (previous do/while loop) */
d5faf4814ddb Update to LibTomCrypt 1.16
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73 if ((err = mp_lcm( tmp1, tmp2, tmp1)) != CRYPT_OK) { goto errkey; } /* tmp1 = lcm(p-1, q-1) */
280
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74
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75 /* make key */
380
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76 if ((err = mp_init_multi(&key->e, &key->d, &key->N, &key->dQ, &key->dP, &key->qP, &key->p, &key->q, NULL)) != CRYPT_OK) {
d5faf4814ddb Update to LibTomCrypt 1.16
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77 goto errkey;
280
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78 }
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79
380
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80 if ((err = mp_set_int( key->e, e)) != CRYPT_OK) { goto errkey; } /* key->e = e */
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81 if ((err = mp_invmod( key->e, tmp1, key->d)) != CRYPT_OK) { goto errkey; } /* key->d = 1/e mod lcm(p-1,q-1) */
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82 if ((err = mp_mul( p, q, key->N)) != CRYPT_OK) { goto errkey; } /* key->N = pq */
280
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83
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84 /* optimize for CRT now */
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85 /* find d mod q-1 and d mod p-1 */
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d5faf4814ddb Update to LibTomCrypt 1.16
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86 if ((err = mp_sub_d( p, 1, tmp1)) != CRYPT_OK) { goto errkey; } /* tmp1 = q-1 */
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parents: 280
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87 if ((err = mp_sub_d( q, 1, tmp2)) != CRYPT_OK) { goto errkey; } /* tmp2 = p-1 */
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88 if ((err = mp_mod( key->d, tmp1, key->dP)) != CRYPT_OK) { goto errkey; } /* dP = d mod p-1 */
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parents: 280
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89 if ((err = mp_mod( key->d, tmp2, key->dQ)) != CRYPT_OK) { goto errkey; } /* dQ = d mod q-1 */
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90 if ((err = mp_invmod( q, p, key->qP)) != CRYPT_OK) { goto errkey; } /* qP = 1/q mod p */
280
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91
380
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92 if ((err = mp_copy( p, key->p)) != CRYPT_OK) { goto errkey; }
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93 if ((err = mp_copy( q, key->q)) != CRYPT_OK) { goto errkey; }
280
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94
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95 /* set key type (in this case it's CRT optimized) */
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96 key->type = PK_PRIVATE;
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97
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98 /* return ok and free temps */
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99 err = CRYPT_OK;
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100 goto cleanup;
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101 errkey:
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102 mp_clear_multi(key->d, key->e, key->N, key->dQ, key->dP, key->qP, key->p, key->q, NULL);
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103 cleanup:
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104 mp_clear_multi(tmp3, tmp2, tmp1, p, q, NULL);
280
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105 return err;
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106 }
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107
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108 #endif
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109
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110 /* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_make_key.c,v $ */
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111 /* $Revision: 1.14 $ */
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112 /* $Date: 2006/12/04 22:23:27 $ */