1 files changed, 269 insertions, 0 deletions
diff --git a/openssl/crypto/rsa/rsa_pss.c b/openssl/crypto/rsa/rsa_pss.c
new file mode 100644
index 000000000..9b993aca4
--- /dev/null
+++ b/openssl/crypto/rsa/rsa_pss.c
@@ -0,0 +1,269 @@
+/* rsa_pss.c */
+/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
+ * project 2005.
+ */
+/* ====================================================================
+ * Copyright (c) 2005 The OpenSSL Project.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    licensing@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com).  This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ */
+
+#include <stdio.h>
+#include "cryptlib.h"
+#include <openssl/bn.h>
+#include <openssl/rsa.h>
+#include <openssl/evp.h>
+#include <openssl/rand.h>
+#include <openssl/sha.h>
+
+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)
+	{
+	int i;
+	int ret = 0;
+	int hLen, maskedDBLen, MSBits, emLen;
+	const unsigned char *H;
+	unsigned char *DB = NULL;
+	EVP_MD_CTX ctx;
+	unsigned char H_[EVP_MAX_MD_SIZE];
+
+	hLen = M_EVP_MD_size(Hash);
+	/*
+	 * Negative sLen has special meanings:
+	 *	-1	sLen == hLen
+	 *	-2	salt length is autorecovered from signature
+	 *	-N	reserved
+	 */
+	if      (sLen == -1)	sLen = hLen;
+	else if (sLen == -2)	sLen = -2;
+	else if (sLen < -2)
+		{
+		RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_SLEN_CHECK_FAILED);
+		goto err;
+		}
+
+	MSBits = (BN_num_bits(rsa->n) - 1) & 0x7;
+	emLen = RSA_size(rsa);
+	if (EM[0] & (0xFF << MSBits))
+		{
+		RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_FIRST_OCTET_INVALID);
+		goto err;
+		}
+	if (MSBits == 0)
+		{
+		EM++;
+		emLen--;
+		}
+	if (emLen < (hLen + sLen + 2)) /* sLen can be small negative */
+		{
+		RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_DATA_TOO_LARGE);
+		goto err;
+		}
+	if (EM[emLen - 1] != 0xbc)
+		{
+		RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_LAST_OCTET_INVALID);
+		goto err;
+		}
+	maskedDBLen = emLen - hLen - 1;
+	H = EM + maskedDBLen;
+	DB = OPENSSL_malloc(maskedDBLen);
+	if (!DB)
+		{
+		RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, ERR_R_MALLOC_FAILURE);
+		goto err;
+		}
+	PKCS1_MGF1(DB, maskedDBLen, H, hLen, Hash);
+	for (i = 0; i < maskedDBLen; i++)
+		DB[i] ^= EM[i];
+	if (MSBits)
+		DB[0] &= 0xFF >> (8 - 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);
+		goto err;
+		}
+	if (sLen >= 0 && (maskedDBLen - i) != sLen)
+		{
+		RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, 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 (maskedDBLen - i)
+		EVP_DigestUpdate(&ctx, DB + i, maskedDBLen - i);
+	EVP_DigestFinal(&ctx, H_, NULL);
+	EVP_MD_CTX_cleanup(&ctx);
+	if (memcmp(H_, H, hLen))
+		{
+		RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_BAD_SIGNATURE);
+		ret = 0;
+		}
+	else 
+		ret = 1;
+
+	err:
+	if (DB)
+		OPENSSL_free(DB);
+
+	return ret;
+
+	}
+
+int RSA_padding_add_PKCS1_PSS(RSA *rsa, unsigned char *EM,
+			const unsigned char *mHash,
+			const EVP_MD *Hash, int sLen)
+	{
+	int i;
+	int ret = 0;
+	int hLen, maskedDBLen, MSBits, emLen;
+	unsigned char *H, *salt = NULL, *p;
+	EVP_MD_CTX ctx;
+
+	hLen = M_EVP_MD_size(Hash);
+	/*
+	 * Negative sLen has special meanings:
+	 *	-1	sLen == hLen
+	 *	-2	salt length is maximized
+	 *	-N	reserved
+	 */
+	if      (sLen == -1)	sLen = hLen;
+	else if (sLen == -2)	sLen = -2;
+	else if (sLen < -2)
+		{
+		RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS, RSA_R_SLEN_CHECK_FAILED);
+		goto err;
+		}
+
+	MSBits = (BN_num_bits(rsa->n) - 1) & 0x7;
+	emLen = RSA_size(rsa);
+	if (MSBits == 0)
+		{
+		*EM++ = 0;
+		emLen--;
+		}
+	if (sLen == -2)
+		{
+		sLen = emLen - hLen - 2;
+		}
+	else if (emLen < (hLen + sLen + 2))
+		{
+		RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS,
+		   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);
+			goto err;
+			}
+		if (!RAND_bytes(salt, sLen))
+			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);
+	EVP_MD_CTX_cleanup(&ctx);
+
+	/* Generate dbMask in place then perform XOR on it */
+	PKCS1_MGF1(EM, maskedDBLen, H, hLen, Hash);
+
+	p = EM;
+
+	/* Initial PS XORs with all zeroes which is a NOP so just update
+	 * pointer. Note from a test above this value is guaranteed to
+	 * be non-negative.
+	 */
+	p += emLen - sLen - hLen - 2;
+	*p++ ^= 0x1;
+	if (sLen > 0)
+		{
+		for (i = 0; i < sLen; i++)
+			*p++ ^= salt[i];
+		}
+	if (MSBits)
+		EM[0] &= 0xFF >> (8 - MSBits);
+
+	/* H is already in place so just set final 0xbc */
+
+	EM[emLen - 1] = 0xbc;
+
+	ret = 1;
+
+	err:
+	if (salt)
+		OPENSSL_free(salt);
+
+	return ret;
+
+	}
+
+#if defined(_MSC_VER)
+#pragma optimize("",on)
+#endif