1 files changed, 290 insertions, 0 deletions
diff --git a/openssl/crypto/rsa/rsa_pss.c b/openssl/crypto/rsa/rsa_pss.c
new file mode 100644
index 0000000..41bc084
--- /dev/null
+++ b/openssl/crypto/rsa/rsa_pss.c
@@ -0,0 +1,290 @@
+/* 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)
+{
+    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;
+    const unsigned char *H;
+    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);
+    if (hLen < 0)
+        goto err;
+    /*-
+     * 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_MGF1, 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_MGF1, 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_MGF1, RSA_R_DATA_TOO_LARGE);
+        goto err;
+    }
+    if (EM[emLen - 1] != 0xbc) {
+        RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, 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_MGF1, ERR_R_MALLOC_FAILURE);
+        goto err;
+    }
+    if (PKCS1_MGF1(DB, maskedDBLen, H, hLen, mgf1Hash) < 0)
+        goto err;
+    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_MGF1, RSA_R_SLEN_RECOVERY_FAILED);
+        goto err;
+    }
+    if (sLen >= 0 && (maskedDBLen - i) != sLen) {
+        RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_SLEN_CHECK_FAILED);
+        goto err;
+    }
+    if (!EVP_DigestInit_ex(&ctx, Hash, NULL)
+        || !EVP_DigestUpdate(&ctx, zeroes, sizeof zeroes)
+        || !EVP_DigestUpdate(&ctx, mHash, hLen))
+        goto err;
+    if (maskedDBLen - i) {
+        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_MGF1, RSA_R_BAD_SIGNATURE);
+        ret = 0;
+    } else
+        ret = 1;
+
+ err:
+    if (DB)
+        OPENSSL_free(DB);
+    EVP_MD_CTX_cleanup(&ctx);
+
+    return ret;
+
+}
+
+int RSA_padding_add_PKCS1_PSS(RSA *rsa, unsigned char *EM,
+                              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;
+
+    if (mgf1Hash == NULL)
+        mgf1Hash = Hash;
+
+    hLen = EVP_MD_size(Hash);
+    if (hLen < 0)
+        goto err;
+    /*-
+     * 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_MGF1, 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_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_MGF1,
+                   ERR_R_MALLOC_FAILURE);
+            goto err;
+        }
+        if (RAND_bytes(salt, sLen) <= 0)
+            goto err;
+    }
+    maskedDBLen = emLen - hLen - 1;
+    H = EM + maskedDBLen;
+    EVP_MD_CTX_init(&ctx);
+    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 */
+    if (PKCS1_MGF1(EM, maskedDBLen, H, hLen, mgf1Hash))
+        goto err;
+
+    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