1f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* LibTomCrypt, modular cryptographic library -- Tom St Denis 2f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * 3f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * LibTomCrypt is a library that provides various cryptographic 4f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * algorithms in a highly modular and flexible manner. 5f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * 6f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * The library is free for all purposes without any express 7f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * guarantee it works. 8f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * 9f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com 10f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project */ 11f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#include "tomcrypt.h" 12f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 13f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/** 14f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @file rsa_make_key.c 15f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project RSA key generation, Tom St Denis 16f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project*/ 17f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 18f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#ifdef MRSA 19f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 20f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/** 21f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project Create an RSA key 22f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @param prng An active PRNG state 23f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @param wprng The index of the PRNG desired 24f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @param size The size of the modulus (key size) desired (octets) 25f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @param e The "e" value (public key). e==65537 is a good choice 26f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @param key [out] Destination of a newly created private key pair 27f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @return CRYPT_OK if successful, upon error all allocated ram is freed 28f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project*/ 29f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectint rsa_make_key(prng_state *prng, int wprng, int size, long e, rsa_key *key) 30f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project{ 31f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project void *p, *q, *tmp1, *tmp2, *tmp3; 32f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project int err; 33f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 34f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project LTC_ARGCHK(ltc_mp.name != NULL); 35f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project LTC_ARGCHK(key != NULL); 36f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 37f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((size < (MIN_RSA_SIZE/8)) || (size > (MAX_RSA_SIZE/8))) { 38f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return CRYPT_INVALID_KEYSIZE; 39f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 40f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 41f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((e < 3) || ((e & 1) == 0)) { 42f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return CRYPT_INVALID_ARG; 43f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 44f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 45f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = prng_is_valid(wprng)) != CRYPT_OK) { 46f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return err; 47f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 48f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 49f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = mp_init_multi(&p, &q, &tmp1, &tmp2, &tmp3, NULL)) != CRYPT_OK) { 50f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return err; 51f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 52f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 53f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* make primes p and q (optimization provided by Wayne Scott) */ 54f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = mp_set_int(tmp3, e)) != CRYPT_OK) { goto errkey; } /* tmp3 = e */ 55f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 56f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* make prime "p" */ 57f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project do { 58f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = rand_prime( p, size/2, prng, wprng)) != CRYPT_OK) { goto errkey; } 59f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = mp_sub_d( p, 1, tmp1)) != CRYPT_OK) { goto errkey; } /* tmp1 = p-1 */ 60f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = mp_gcd( tmp1, tmp3, tmp2)) != CRYPT_OK) { goto errkey; } /* tmp2 = gcd(p-1, e) */ 61f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } while (mp_cmp_d( tmp2, 1) != 0); /* while e divides p-1 */ 62f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 63f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* make prime "q" */ 64f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project do { 65f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = rand_prime( q, size/2, prng, wprng)) != CRYPT_OK) { goto errkey; } 66f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = mp_sub_d( q, 1, tmp1)) != CRYPT_OK) { goto errkey; } /* tmp1 = q-1 */ 67f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = mp_gcd( tmp1, tmp3, tmp2)) != CRYPT_OK) { goto errkey; } /* tmp2 = gcd(q-1, e) */ 68f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } while (mp_cmp_d( tmp2, 1) != 0); /* while e divides q-1 */ 69f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 70f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* tmp1 = lcm(p-1, q-1) */ 71f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = mp_sub_d( p, 1, tmp2)) != CRYPT_OK) { goto errkey; } /* tmp2 = p-1 */ 72f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* tmp1 = q-1 (previous do/while loop) */ 73f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = mp_lcm( tmp1, tmp2, tmp1)) != CRYPT_OK) { goto errkey; } /* tmp1 = lcm(p-1, q-1) */ 74f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 75f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* make key */ 76f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = mp_init_multi(&key->e, &key->d, &key->N, &key->dQ, &key->dP, &key->qP, &key->p, &key->q, NULL)) != CRYPT_OK) { 77f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project goto errkey; 78f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 79f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 80f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = mp_set_int( key->e, e)) != CRYPT_OK) { goto errkey; } /* key->e = e */ 81f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = mp_invmod( key->e, tmp1, key->d)) != CRYPT_OK) { goto errkey; } /* key->d = 1/e mod lcm(p-1,q-1) */ 82f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = mp_mul( p, q, key->N)) != CRYPT_OK) { goto errkey; } /* key->N = pq */ 83f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 84f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* optimize for CRT now */ 85f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* find d mod q-1 and d mod p-1 */ 86f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = mp_sub_d( p, 1, tmp1)) != CRYPT_OK) { goto errkey; } /* tmp1 = q-1 */ 87f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = mp_sub_d( q, 1, tmp2)) != CRYPT_OK) { goto errkey; } /* tmp2 = p-1 */ 88f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = mp_mod( key->d, tmp1, key->dP)) != CRYPT_OK) { goto errkey; } /* dP = d mod p-1 */ 89f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = mp_mod( key->d, tmp2, key->dQ)) != CRYPT_OK) { goto errkey; } /* dQ = d mod q-1 */ 90f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = mp_invmod( q, p, key->qP)) != CRYPT_OK) { goto errkey; } /* qP = 1/q mod p */ 91f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 92f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = mp_copy( p, key->p)) != CRYPT_OK) { goto errkey; } 93f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = mp_copy( q, key->q)) != CRYPT_OK) { goto errkey; } 94f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 95f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* set key type (in this case it's CRT optimized) */ 96f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project key->type = PK_PRIVATE; 97f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 98f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* return ok and free temps */ 99f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project err = CRYPT_OK; 100f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project goto cleanup; 101f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projecterrkey: 102f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project mp_clear_multi(key->d, key->e, key->N, key->dQ, key->dP, key->qP, key->p, key->q, NULL); 103f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectcleanup: 104f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project mp_clear_multi(tmp3, tmp2, tmp1, p, q, NULL); 105f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return err; 106f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project} 107f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 108f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#endif 109f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 110f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_make_key.c,v $ */ 111f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* $Revision: 1.14 $ */ 112f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* $Date: 2006/12/04 22:23:27 $ */ 113