1 files changed, 261 insertions, 0 deletions

diff --git a/src/lib/libcrypto/rsa/rsa_pss.c b/src/lib/libcrypto/rsa/rsa_pss.c
new file mode 100644
index 0000000000..2815628f5f
--- /dev/null
+++ b/src/lib/libcrypto/rsa/rsa_pss.c
@@ -0,0 +1,261 @@
+/* rsa_pss.c */
+/* Written by Dr Stephen N Henson (shenson@bigfoot.com) 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>
+
+const static unsigned char zeroes[] = {0,0,0,0,0,0,0,0};
+
+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 = 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 = 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;
+
+        }