diff options
Diffstat (limited to 'libtomcrypt/pk/ecc/ecc_make_key.c')
| -rw-r--r-- | libtomcrypt/pk/ecc/ecc_make_key.c | 120 |
1 files changed, 0 insertions, 120 deletions
diff --git a/libtomcrypt/pk/ecc/ecc_make_key.c b/libtomcrypt/pk/ecc/ecc_make_key.c deleted file mode 100644 index 06bb457..0000000 --- a/libtomcrypt/pk/ecc/ecc_make_key.c +++ /dev/null @@ -1,120 +0,0 @@ -/* LibTomCrypt, modular cryptographic library -- Tom St Denis - * - * LibTomCrypt is a library that provides various cryptographic - * algorithms in a highly modular and flexible manner. - * - * The library is free for all purposes without any express - * guarantee it works. - * - * Tom St Denis, tomstdenis@gmail.com, http://libtom.org - */ - -/* Implements ECC over Z/pZ for curve y^2 = x^3 - 3x + b - * - * All curves taken from NIST recommendation paper of July 1999 - * Available at http://csrc.nist.gov/cryptval/dss.htm - */ -#include "tomcrypt.h" - -/** - @file ecc_make_key.c - ECC Crypto, Tom St Denis -*/ - -#ifdef LTC_MECC - -/** - Make a new ECC key - @param keysize The keysize for the new key (in octets from 20 to 65 bytes) - @param key [out] Destination of the newly created key - @return CRYPT_OK if successful, upon error all allocated memory will be freed -*/ -int ecc_make_key(int keysize, ecc_key *key) -{ - int x, err; - - /* find key size */ - for (x = 0; (keysize > ltc_ecc_sets[x].size) && (ltc_ecc_sets[x].size != 0); x++); - keysize = ltc_ecc_sets[x].size; - - if (keysize > ECC_MAXSIZE || ltc_ecc_sets[x].size == 0) { - return CRYPT_INVALID_KEYSIZE; - } - err = ecc_make_key_ex(key, <c_ecc_sets[x]); - key->idx = x; - return err; -} - -int ecc_make_key_ex(ecc_key *key, const ltc_ecc_set_type *dp) -{ - int err; - ecc_point *base; - void *prime, *order; - unsigned char *buf; - int keysize; - - LTC_ARGCHK(key != NULL); - LTC_ARGCHK(ltc_mp.name != NULL); - LTC_ARGCHK(dp != NULL); - - key->idx = -1; - key->dp = dp; - keysize = dp->size; - - /* allocate ram */ - base = NULL; - buf = XMALLOC(ECC_MAXSIZE); - if (buf == NULL) { - return CRYPT_MEM; - } - - /* make up random string */ - get_random_bytes(buf, (unsigned long)keysize); - - /* setup the key variables */ - if ((err = mp_init_multi(&key->pubkey.x, &key->pubkey.y, &key->pubkey.z, &key->k, &prime, &order, NULL)) != CRYPT_OK) { - goto ERR_BUF; - } - base = ltc_ecc_new_point(); - if (base == NULL) { - err = CRYPT_MEM; - goto errkey; - } - - /* read in the specs for this key */ - if ((err = mp_read_radix(prime, (char *)key->dp->prime, 16)) != CRYPT_OK) { goto errkey; } - if ((err = mp_read_radix(order, (char *)key->dp->order, 16)) != CRYPT_OK) { goto errkey; } - if ((err = mp_read_radix(base->x, (char *)key->dp->Gx, 16)) != CRYPT_OK) { goto errkey; } - if ((err = mp_read_radix(base->y, (char *)key->dp->Gy, 16)) != CRYPT_OK) { goto errkey; } - if ((err = mp_set(base->z, 1)) != CRYPT_OK) { goto errkey; } - if ((err = mp_read_unsigned_bin(key->k, (unsigned char *)buf, keysize)) != CRYPT_OK) { goto errkey; } - - /* the key should be smaller than the order of base point */ - if (mp_cmp(key->k, order) != LTC_MP_LT) { - if((err = mp_mod(key->k, order, key->k)) != CRYPT_OK) { goto errkey; } - } - /* make the public key */ - if ((err = ltc_mp.ecc_ptmul(key->k, base, &key->pubkey, prime, 1)) != CRYPT_OK) { goto errkey; } - key->type = PK_PRIVATE; - - /* free up ram */ - err = CRYPT_OK; - goto cleanup; -errkey: - mp_clear_multi(key->pubkey.x, key->pubkey.y, key->pubkey.z, key->k, NULL); -cleanup: - ltc_ecc_del_point(base); - mp_clear_multi(prime, order, NULL); -ERR_BUF: -#ifdef LTC_CLEAN_STACK - zeromem(buf, ECC_MAXSIZE); -#endif - XFREE(buf); - return err; -} - -#endif -/* $Source: /cvs/libtom/libtomcrypt/src/pk/ecc/ecc_make_key.c,v $ */ -/* $Revision: 1.13 $ */ -/* $Date: 2007/05/12 14:32:35 $ */ - |