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);
- }
+ int i, emlen = tlen - 1;
+ unsigned char *db, *seed;
+ unsigned char *dbmask, seedmask[SHA_DIGEST_LENGTH];
- 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);
- }
+ 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);
+ }
- to[0] = 0;
- seed = to + 1;
- db = to + SHA_DIGEST_LENGTH + 1;
-
- EVP_Digest((void *)param, plen, db, NULL, EVP_sha1());
- 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);
+ 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;
+
+ EVP_Digest((void *)param, plen, db, NULL, EVP_sha1());
+ 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,
+ 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];
+ 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);
- }
+ 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 = NULL, seed[SHA_DIGEST_LENGTH], phash[SHA_DIGEST_LENGTH];
-
- if (--num < 2 * SHA_DIGEST_LENGTH + 1)
- goto decoding_err;
-
- lzero = num - flen;
- if (lzero < 0)
- goto decoding_err;
- maskeddb = from - lzero + SHA_DIGEST_LENGTH;
-
- 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);
- }
+ int i, dblen, mlen = -1;
+ const unsigned char *maskeddb;
+ int lzero;
+ unsigned char *db = NULL, seed[SHA_DIGEST_LENGTH], phash[SHA_DIGEST_LENGTH];
+
+ if (--num < 2 * SHA_DIGEST_LENGTH + 1)
+ goto decoding_err;
+
+ lzero = num - flen;
+ if (lzero < 0)
+ goto decoding_err;
+ maskeddb = from - lzero + SHA_DIGEST_LENGTH;
+
+ 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);
+ }
- MGF1(seed, SHA_DIGEST_LENGTH, maskeddb, dblen);
- for (i = lzero; i < SHA_DIGEST_LENGTH; i++)
- seed[i] ^= from[i - lzero];
+ 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];
-
- EVP_Digest((void *)param, plen, phash, NULL, EVP_sha1());
-
- if (memcmp(db, phash, SHA_DIGEST_LENGTH) != 0)
- goto decoding_err;
- else
- {
- for (i = SHA_DIGEST_LENGTH; i < dblen; i++)
- if (db[i] != 0x00)
- break;
- if (db[i] != 0x01 || i++ >= dblen)
- goto decoding_err;
+ MGF1(db, dblen, seed, SHA_DIGEST_LENGTH);
+ for (i = 0; i < dblen; i++)
+ db[i] ^= maskeddb[i];
+
+ EVP_Digest((void *)param, plen, phash, NULL, EVP_sha1());
+
+ if (memcmp(db, phash, SHA_DIGEST_LENGTH) != 0)
+ goto decoding_err;
else
- {
- mlen = dblen - i;
- if (tlen < mlen)
{
- RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_OAEP, RSA_R_DATA_TOO_LARGE);
- mlen = -1;
+ for (i = SHA_DIGEST_LENGTH; i < dblen; i++)
+ if (db[i] != 0x00)
+ break;
+ if (db[i] != 0x01 || i++ >= dblen)
+ goto decoding_err;
+ else
+ {
+ mlen = dblen - i;
+ if (tlen < mlen)
+ {
+ RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_OAEP, RSA_R_DATA_TOO_LARGE);
+ mlen = -1;
+ }
+ else
+ memcpy(to, db + i, mlen);
+ }
}
- else
- memcpy(to, db + i, mlen);
- }
- }
- OPENSSL_free(db);
- return (mlen);
-
+ OPENSSL_free(db);
+ return mlen;
+
decoding_err:
- /* to avoid chosen ciphertext attacks, the error message should not reveal
- * which kind of decoding error happened */
- RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_OAEP, RSA_R_OAEP_DECODING_ERROR);
- if (db != NULL) OPENSSL_free(db);
- return -1;
- }
+ /* to avoid chosen ciphertext attacks, the error message should not reveal
+ * which kind of decoding error happened */
+ RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_OAEP, RSA_R_OAEP_DECODING_ERROR);
+ if (db != NULL) OPENSSL_free(db);
+ return -1;
+ }
int MGF1(unsigned char *mask, long len,
const unsigned char *seed, long seedlen)
- {
- long i, outlen = 0;
- unsigned char cnt[4];
- EVP_MD_CTX c;
- unsigned char md[SHA_DIGEST_LENGTH];
-
- EVP_MD_CTX_init(&c);
- for (i = 0; outlen < len; i++)
{
- cnt[0] = (unsigned char)((i >> 24) & 255);
- cnt[1] = (unsigned char)((i >> 16) & 255);
- cnt[2] = (unsigned char)((i >> 8)) & 255;
- cnt[3] = (unsigned char)(i & 255);
- EVP_DigestInit(&c,EVP_sha1());
- EVP_DigestUpdate(&c, seed, seedlen);
- EVP_DigestUpdate(&c, cnt, 4);
- if (outlen + SHA_DIGEST_LENGTH <= len)
- {
- EVP_DigestFinal(&c, mask + outlen, NULL);
- outlen += SHA_DIGEST_LENGTH;
- }
- else
- {
- EVP_DigestFinal(&c, md, NULL);
- memcpy(mask + outlen, md, len - outlen);
- outlen = len;
- }
+ long i, outlen = 0;
+ unsigned char cnt[4];
+ EVP_MD_CTX c;
+ unsigned char md[SHA_DIGEST_LENGTH];
+
+ EVP_MD_CTX_init(&c);
+ for (i = 0; outlen < len; i++)
+ {
+ cnt[0] = (unsigned char)((i >> 24) & 255);
+ cnt[1] = (unsigned char)((i >> 16) & 255);
+ cnt[2] = (unsigned char)((i >> 8)) & 255;
+ cnt[3] = (unsigned char)(i & 255);
+ EVP_DigestInit(&c,EVP_sha1());
+ EVP_DigestUpdate(&c, seed, seedlen);
+ EVP_DigestUpdate(&c, cnt, 4);
+ if (outlen + SHA_DIGEST_LENGTH <= len)
+ {
+ EVP_DigestFinal(&c, mask + outlen, NULL);
+ outlen += SHA_DIGEST_LENGTH;
+ }
+ else
+ {
+ EVP_DigestFinal(&c, md, NULL);
+ memcpy(mask + outlen, md, len - outlen);
+ outlen = len;
+ }
+ }
+ EVP_MD_CTX_cleanup(&c);
+ return 0;
}
- EVP_MD_CTX_cleanup(&c);
- return (0);
- }
#endif
projects / openssl.git / commitdiff