/* rsa_pss.c */
-/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
+/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
* project 2005.
*/
/* ====================================================================
*
*/
+
+
#include <stdio.h>
#include "cryptlib.h"
#include <openssl/bn.h>
#include <openssl/evp.h>
#include <openssl/rand.h>
#include <openssl/sha.h>
+#include "rsa_locl.h"
-const static unsigned char zeroes[] = {0,0,0,0,0,0,0,0};
+static const unsigned char zeroes[] = {0,0,0,0,0,0,0,0};
+
+#if defined(_MSC_VER) && defined(_ARM_)
+#pragma optimize("g", off)
+#endif
int RSA_verify_PKCS1_PSS(RSA *rsa, const unsigned char *mHash,
const EVP_MD *Hash, const unsigned char *EM, int sLen)
{
+ return RSA_verify_PKCS1_PSS_mgf1(rsa, mHash, Hash, NULL, EM, sLen);
+ }
+
+int RSA_verify_PKCS1_PSS_mgf1(RSA *rsa, const unsigned char *mHash,
+ const EVP_MD *Hash, const EVP_MD *mgf1Hash,
+ const unsigned char *EM, int sLen)
+ {
int i;
int ret = 0;
int hLen, maskedDBLen, MSBits, emLen;
unsigned char *DB = NULL;
EVP_MD_CTX ctx;
unsigned char H_[EVP_MAX_MD_SIZE];
+ EVP_MD_CTX_init(&ctx);
+
+ if (mgf1Hash == NULL)
+ mgf1Hash = Hash;
- hLen = EVP_MD_size(Hash);
- /*
+ hLen = M_EVP_MD_size(Hash);
+ if (hLen < 0)
+ goto err;
+ /*-
* Negative sLen has special meanings:
* -1 sLen == hLen
* -2 salt length is autorecovered from signature
else if (sLen == -2) sLen = -2;
else if (sLen < -2)
{
- RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_SLEN_CHECK_FAILED);
+ RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_SLEN_CHECK_FAILED);
goto err;
}
emLen = RSA_size(rsa);
if (EM[0] & (0xFF << MSBits))
{
- RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_FIRST_OCTET_INVALID);
+ RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_FIRST_OCTET_INVALID);
goto err;
}
if (MSBits == 0)
}
if (emLen < (hLen + sLen + 2)) /* sLen can be small negative */
{
- RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_DATA_TOO_LARGE);
+ RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_DATA_TOO_LARGE);
goto err;
}
if (EM[emLen - 1] != 0xbc)
{
- RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_LAST_OCTET_INVALID);
+ RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_LAST_OCTET_INVALID);
goto err;
}
maskedDBLen = emLen - hLen - 1;
DB = OPENSSL_malloc(maskedDBLen);
if (!DB)
{
- RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, ERR_R_MALLOC_FAILURE);
+ RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, ERR_R_MALLOC_FAILURE);
goto err;
}
- PKCS1_MGF1(DB, maskedDBLen, H, hLen, Hash);
+ if (PKCS1_MGF1(DB, maskedDBLen, H, hLen, mgf1Hash) < 0)
+ goto err;
for (i = 0; i < maskedDBLen; i++)
DB[i] ^= EM[i];
if (MSBits)
for (i = 0; DB[i] == 0 && i < (maskedDBLen-1); i++) ;
if (DB[i++] != 0x1)
{
- RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_SLEN_RECOVERY_FAILED);
+ RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_SLEN_RECOVERY_FAILED);
goto err;
}
if (sLen >= 0 && (maskedDBLen - i) != sLen)
{
- RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_SLEN_CHECK_FAILED);
+ RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_SLEN_CHECK_FAILED);
goto err;
}
- EVP_MD_CTX_init(&ctx);
- EVP_DigestInit_ex(&ctx, Hash, NULL);
- EVP_DigestUpdate(&ctx, zeroes, sizeof zeroes);
- EVP_DigestUpdate(&ctx, mHash, hLen);
+ if (!EVP_DigestInit_ex(&ctx, Hash, NULL)
+ || !EVP_DigestUpdate(&ctx, zeroes, sizeof zeroes)
+ || !EVP_DigestUpdate(&ctx, mHash, hLen))
+ goto err;
if (maskedDBLen - i)
- EVP_DigestUpdate(&ctx, DB + i, maskedDBLen - i);
- EVP_DigestFinal(&ctx, H_, NULL);
- EVP_MD_CTX_cleanup(&ctx);
+ {
+ if (!EVP_DigestUpdate(&ctx, DB + i, maskedDBLen - i))
+ goto err;
+ }
+ if (!EVP_DigestFinal_ex(&ctx, H_, NULL))
+ goto err;
if (memcmp(H_, H, hLen))
{
- RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_BAD_SIGNATURE);
+ RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_BAD_SIGNATURE);
ret = 0;
}
else
err:
if (DB)
OPENSSL_free(DB);
+ EVP_MD_CTX_cleanup(&ctx);
return ret;
const unsigned char *mHash,
const EVP_MD *Hash, int sLen)
{
+ return RSA_padding_add_PKCS1_PSS_mgf1(rsa, EM, mHash, Hash, NULL, sLen);
+ }
+
+int RSA_padding_add_PKCS1_PSS_mgf1(RSA *rsa, unsigned char *EM,
+ const unsigned char *mHash,
+ const EVP_MD *Hash, const EVP_MD *mgf1Hash, int sLen)
+ {
int i;
int ret = 0;
int hLen, maskedDBLen, MSBits, emLen;
unsigned char *H, *salt = NULL, *p;
EVP_MD_CTX ctx;
- hLen = EVP_MD_size(Hash);
- /*
+ if (mgf1Hash == NULL)
+ mgf1Hash = Hash;
+
+ hLen = M_EVP_MD_size(Hash);
+ if (hLen < 0)
+ goto err;
+ /*-
* Negative sLen has special meanings:
* -1 sLen == hLen
* -2 salt length is maximized
else if (sLen == -2) sLen = -2;
else if (sLen < -2)
{
- RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS, RSA_R_SLEN_CHECK_FAILED);
+ RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS_MGF1, RSA_R_SLEN_CHECK_FAILED);
goto err;
}
}
else if (emLen < (hLen + sLen + 2))
{
- RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS,
- RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
+ RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS_MGF1,RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
goto err;
}
if (sLen > 0)
salt = OPENSSL_malloc(sLen);
if (!salt)
{
- RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS,
- ERR_R_MALLOC_FAILURE);
+ RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS_MGF1,ERR_R_MALLOC_FAILURE);
goto err;
}
- if (!RAND_bytes(salt, sLen))
+ if (RAND_bytes(salt, sLen) <= 0)
goto err;
}
maskedDBLen = emLen - hLen - 1;
H = EM + maskedDBLen;
EVP_MD_CTX_init(&ctx);
- EVP_DigestInit_ex(&ctx, Hash, NULL);
- EVP_DigestUpdate(&ctx, zeroes, sizeof zeroes);
- EVP_DigestUpdate(&ctx, mHash, hLen);
- if (sLen)
- EVP_DigestUpdate(&ctx, salt, sLen);
- EVP_DigestFinal(&ctx, H, NULL);
+ if (!EVP_DigestInit_ex(&ctx, Hash, NULL)
+ || !EVP_DigestUpdate(&ctx, zeroes, sizeof zeroes)
+ || !EVP_DigestUpdate(&ctx, mHash, hLen))
+ goto err;
+ if (sLen && !EVP_DigestUpdate(&ctx, salt, sLen))
+ goto err;
+ if (!EVP_DigestFinal_ex(&ctx, H, NULL))
+ goto err;
EVP_MD_CTX_cleanup(&ctx);
/* Generate dbMask in place then perform XOR on it */
- PKCS1_MGF1(EM, maskedDBLen, H, hLen, Hash);
+ if (PKCS1_MGF1(EM, maskedDBLen, H, hLen, mgf1Hash))
+ goto err;
p = EM;
return ret;
}
+
+#if defined(_MSC_VER)
+#pragma optimize("",on)
+#endif