--- /dev/null
+/* 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
projects / cassiopeia.git / blobdiff