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fix formatting so that the file can be view with any tab-width

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This commit is contained in:
Bodo Möller 2001-09-06 09:30:16 +00:00
parent 3cad81f6fe
commit e1a4814cd4
1 changed files with 128 additions and 128 deletions
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256
crypto/rsa/rsa_oaep.c
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@ -34,158 +34,158 @@ int MGF1(unsigned char *mask, long len,
int RSA_padding_add_PKCS1_OAEP(unsigned char *to, int tlen, int RSA_padding_add_PKCS1_OAEP(unsigned char *to, int tlen,
const unsigned char *from, int flen, const unsigned char *from, int flen,
const unsigned char *param, int plen) 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, int i, emlen = tlen - 1;
RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE); unsigned char *db, *seed;
return (0); unsigned char *dbmask, seedmask[SHA_DIGEST_LENGTH];
}
if (emlen < 2 * SHA_DIGEST_LENGTH + 1) if (flen > emlen - 2 * SHA_DIGEST_LENGTH - 1)
{ {
RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, RSA_R_KEY_SIZE_TOO_SMALL); RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP,
return (0); RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
} 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; if (emlen < 2 * SHA_DIGEST_LENGTH + 1)
seed = to + 1; {
db = to + 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);
}
EVP_Digest((void *)param, plen, db, NULL, EVP_sha1()); to[0] = 0;
memset(db + SHA_DIGEST_LENGTH, 0, seed = to + 1;
emlen - flen - 2 * SHA_DIGEST_LENGTH - 1); db = to + SHA_DIGEST_LENGTH + 1;
db[emlen - flen - SHA_DIGEST_LENGTH - 1] = 0x01;
memcpy(db + emlen - flen - SHA_DIGEST_LENGTH, from, (unsigned int) flen); EVP_Digest((void *)param, plen, db, NULL, EVP_sha1());
if (RAND_bytes(seed, SHA_DIGEST_LENGTH) <= 0) memset(db + SHA_DIGEST_LENGTH, 0,
return (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 #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", "\xaa\xfd\x12\xf6\x59\xca\xe6\x34\x89\xb4\x79\xe5\x07\x6d\xde\xc2\xf0\x6c\xb5\x8f",
20); 20);
#endif #endif
MGF1(dbmask, emlen - SHA_DIGEST_LENGTH, seed, SHA_DIGEST_LENGTH); MGF1(dbmask, emlen - SHA_DIGEST_LENGTH, seed, SHA_DIGEST_LENGTH);
for (i = 0; i < emlen - SHA_DIGEST_LENGTH; i++) for (i = 0; i < emlen - SHA_DIGEST_LENGTH; i++)
db[i] ^= dbmask[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(seedmask, SHA_DIGEST_LENGTH, db, emlen - SHA_DIGEST_LENGTH); OPENSSL_free(dbmask);
for (i = 0; i < SHA_DIGEST_LENGTH; i++) return 1;
seed[i] ^= seedmask[i]; }
OPENSSL_free(dbmask);
return (1);
}
int RSA_padding_check_PKCS1_OAEP(unsigned char *to, int tlen, int RSA_padding_check_PKCS1_OAEP(unsigned char *to, int tlen,
const unsigned char *from, int flen, int num, const unsigned char *from, int flen, int num,
const unsigned char *param, int plen) 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); int i, dblen, mlen = -1;
return (-1); const unsigned char *maskeddb;
} int lzero;
unsigned char *db = NULL, seed[SHA_DIGEST_LENGTH], phash[SHA_DIGEST_LENGTH];
MGF1(seed, SHA_DIGEST_LENGTH, maskeddb, dblen); if (--num < 2 * SHA_DIGEST_LENGTH + 1)
for (i = lzero; i < SHA_DIGEST_LENGTH; i++) goto decoding_err;
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()); lzero = num - flen;
if (lzero < 0)
if (memcmp(db, phash, SHA_DIGEST_LENGTH) != 0) goto decoding_err;
goto decoding_err; maskeddb = from - lzero + SHA_DIGEST_LENGTH;
else
{ dblen = num - SHA_DIGEST_LENGTH;
for (i = SHA_DIGEST_LENGTH; i < dblen; i++) db = OPENSSL_malloc(dblen);
if (db[i] != 0x00) if (db == NULL)
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); RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, ERR_R_MALLOC_FAILURE);
mlen = -1; return (-1);
} }
else
memcpy(to, db + i, mlen);
}
}
OPENSSL_free(db);
return (mlen);
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;
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);
}
}
OPENSSL_free(db);
return mlen;
decoding_err: decoding_err:
/* to avoid chosen ciphertext attacks, the error message should not reveal /* to avoid chosen ciphertext attacks, the error message should not reveal
* which kind of decoding error happened */ * which kind of decoding error happened */
RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_OAEP, RSA_R_OAEP_DECODING_ERROR); RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_OAEP, RSA_R_OAEP_DECODING_ERROR);
if (db != NULL) OPENSSL_free(db); if (db != NULL) OPENSSL_free(db);
return -1; return -1;
} }
int MGF1(unsigned char *mask, long len, int MGF1(unsigned char *mask, long len,
const unsigned char *seed, long seedlen) 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); long i, outlen = 0;
cnt[1] = (unsigned char)((i >> 16) & 255); unsigned char cnt[4];
cnt[2] = (unsigned char)((i >> 8)) & 255; EVP_MD_CTX c;
cnt[3] = (unsigned char)(i & 255); unsigned char md[SHA_DIGEST_LENGTH];
EVP_DigestInit(&c,EVP_sha1());
EVP_DigestUpdate(&c, seed, seedlen); EVP_MD_CTX_init(&c);
EVP_DigestUpdate(&c, cnt, 4); for (i = 0; outlen < len; i++)
if (outlen + SHA_DIGEST_LENGTH <= len) {
{ cnt[0] = (unsigned char)((i >> 24) & 255);
EVP_DigestFinal(&c, mask + outlen, NULL); cnt[1] = (unsigned char)((i >> 16) & 255);
outlen += SHA_DIGEST_LENGTH; cnt[2] = (unsigned char)((i >> 8)) & 255;
} cnt[3] = (unsigned char)(i & 255);
else EVP_DigestInit(&c,EVP_sha1());
{ EVP_DigestUpdate(&c, seed, seedlen);
EVP_DigestFinal(&c, md, NULL); EVP_DigestUpdate(&c, cnt, 4);
memcpy(mask + outlen, md, len - outlen); if (outlen + SHA_DIGEST_LENGTH <= len)
outlen = 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 #endif