diff options
Diffstat (limited to 'crypto/rsa/rsa_pss.c')
| -rw-r--r-- | crypto/rsa/rsa_pss.c | 282 |
1 files changed, 282 insertions, 0 deletions
diff --git a/crypto/rsa/rsa_pss.c b/crypto/rsa/rsa_pss.c new file mode 100644 index 0000000000..4efb8eddad --- /dev/null +++ b/crypto/rsa/rsa_pss.c @@ -0,0 +1,282 @@ +/* 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]; + EVP_MD_CTX_init(&ctx); + + 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, 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; + } + if (PKCS1_MGF1(DB, maskedDBLen, H, hLen, Hash) < 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, 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; + } + 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(&ctx, H_, NULL)) + goto err; + 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); + 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) + { + 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 (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, 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) <= 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(&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, Hash)) + 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 |