diff options
Diffstat (limited to 'crypto/rsa/rsa_oaep.c')
| -rw-r--r-- | crypto/rsa/rsa_oaep.c | 166 |
1 files changed, 0 insertions, 166 deletions
diff --git a/crypto/rsa/rsa_oaep.c b/crypto/rsa/rsa_oaep.c deleted file mode 100644 index f735c8d..0000000 --- a/crypto/rsa/rsa_oaep.c +++ /dev/null @@ -1,166 +0,0 @@ -/* crypto/rsa/rsa_oaep.c */ -/* Written by Ulf Moeller. This software is distributed on an "AS IS" - basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. */ - -/* EME_OAEP as defined in RFC 2437 (PKCS #1 v2.0) */ - -#if !defined(NO_SHA) && !defined(NO_SHA1) -#include <stdio.h> -#include "cryptlib.h" -#include <openssl/bn.h> -#include <openssl/rsa.h> -#include <openssl/sha.h> -#include <openssl/rand.h> - -int MGF1(unsigned char *mask, long len, - const unsigned char *seed, long seedlen); - -int RSA_padding_add_PKCS1_OAEP(unsigned char *to, int tlen, - const unsigned char *from, int flen, - const unsigned char *param, int plen) - { - int i, emlen = tlen - 1; - unsigned char *db, *seed; - unsigned char *dbmask, seedmask[SHA_DIGEST_LENGTH]; - - if (flen > emlen - 2 * SHA_DIGEST_LENGTH - 1) - { - RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, - RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE); - return (0); - } - - if (emlen < 2 * SHA_DIGEST_LENGTH + 1) - { - RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, RSA_R_KEY_SIZE_TOO_SMALL); - return (0); - } - - dbmask = OPENSSL_malloc(emlen - SHA_DIGEST_LENGTH); - if (dbmask == NULL) - { - RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, ERR_R_MALLOC_FAILURE); - return (0); - } - - to[0] = 0; - seed = to + 1; - db = to + SHA_DIGEST_LENGTH + 1; - - SHA1(param, plen, db); - memset(db + SHA_DIGEST_LENGTH, 0, - emlen - flen - 2 * SHA_DIGEST_LENGTH - 1); - db[emlen - flen - SHA_DIGEST_LENGTH - 1] = 0x01; - memcpy(db + emlen - flen - SHA_DIGEST_LENGTH, from, (unsigned int) flen); - if (RAND_bytes(seed, SHA_DIGEST_LENGTH) <= 0) - return (0); -#ifdef PKCS_TESTVECT - memcpy(seed, - "\xaa\xfd\x12\xf6\x59\xca\xe6\x34\x89\xb4\x79\xe5\x07\x6d\xde\xc2\xf0\x6c\xb5\x8f", - 20); -#endif - - MGF1(dbmask, emlen - SHA_DIGEST_LENGTH, seed, SHA_DIGEST_LENGTH); - for (i = 0; i < emlen - SHA_DIGEST_LENGTH; i++) - db[i] ^= dbmask[i]; - - MGF1(seedmask, SHA_DIGEST_LENGTH, db, emlen - SHA_DIGEST_LENGTH); - for (i = 0; i < SHA_DIGEST_LENGTH; i++) - seed[i] ^= seedmask[i]; - - OPENSSL_free(dbmask); - return (1); - } - -int RSA_padding_check_PKCS1_OAEP(unsigned char *to, int tlen, - const unsigned char *from, int flen, int num, - const unsigned char *param, int plen) - { - int i, dblen, mlen = -1; - const unsigned char *maskeddb; - int lzero; - unsigned char *db, seed[SHA_DIGEST_LENGTH], phash[SHA_DIGEST_LENGTH]; - - if (--num < 2 * SHA_DIGEST_LENGTH + 1) - { - RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_OAEP, RSA_R_OAEP_DECODING_ERROR); - return (-1); - } - - dblen = num - SHA_DIGEST_LENGTH; - db = OPENSSL_malloc(dblen); - if (db == NULL) - { - RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, ERR_R_MALLOC_FAILURE); - return (-1); - } - - lzero = num - flen; - maskeddb = from - lzero + SHA_DIGEST_LENGTH; - - MGF1(seed, SHA_DIGEST_LENGTH, maskeddb, dblen); - for (i = lzero; i < SHA_DIGEST_LENGTH; i++) - seed[i] ^= from[i - lzero]; - - MGF1(db, dblen, seed, SHA_DIGEST_LENGTH); - for (i = 0; i < dblen; i++) - db[i] ^= maskeddb[i]; - - SHA1(param, plen, phash); - - if (memcmp(db, phash, SHA_DIGEST_LENGTH) != 0) - RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_OAEP, RSA_R_OAEP_DECODING_ERROR); - else - { - for (i = SHA_DIGEST_LENGTH; i < dblen; i++) - if (db[i] != 0x00) - break; - if (db[i] != 0x01 || i++ >= dblen) - RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_OAEP, - RSA_R_OAEP_DECODING_ERROR); - else - { - mlen = dblen - i; - if (tlen < mlen) - { - RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, RSA_R_DATA_TOO_LARGE); - mlen = -1; - } - else - memcpy(to, db + i, mlen); - } - } - OPENSSL_free(db); - return (mlen); - } - -int MGF1(unsigned char *mask, long len, - const unsigned char *seed, long seedlen) - { - long i, outlen = 0; - unsigned char cnt[4]; - SHA_CTX c; - unsigned char md[SHA_DIGEST_LENGTH]; - - for (i = 0; outlen < len; i++) - { - cnt[0] = (i >> 24) & 255, cnt[1] = (i >> 16) & 255, - cnt[2] = (i >> 8) & 255, cnt[3] = i & 255; - SHA1_Init(&c); - SHA1_Update(&c, seed, seedlen); - SHA1_Update(&c, cnt, 4); - if (outlen + SHA_DIGEST_LENGTH <= len) - { - SHA1_Final(mask + outlen, &c); - outlen += SHA_DIGEST_LENGTH; - } - else - { - SHA1_Final(md, &c); - memcpy(mask + outlen, md, len - outlen); - outlen = len; - } - } - return (0); - } -#endif |