diff options
Diffstat (limited to 'openssl/crypto/rsa/rsa_pss.c')
| -rw-r--r-- | openssl/crypto/rsa/rsa_pss.c | 400 |
1 files changed, 195 insertions, 205 deletions
diff --git a/openssl/crypto/rsa/rsa_pss.c b/openssl/crypto/rsa/rsa_pss.c index 5f9f533d0..41bc0844e 100644 --- a/openssl/crypto/rsa/rsa_pss.c +++ b/openssl/crypto/rsa/rsa_pss.c @@ -1,6 +1,7 @@ /* rsa_pss.c */ -/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL - * project 2005. +/* + * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project + * 2005. */ /* ==================================================================== * Copyright (c) 2005 The OpenSSL Project. All rights reserved. @@ -10,7 +11,7 @@ * are met: * * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. + * 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 @@ -64,237 +65,226 @@ #include <openssl/rand.h> #include <openssl/sha.h> -static const unsigned char zeroes[] = {0,0,0,0,0,0,0,0}; +static const unsigned char zeroes[] = { 0, 0, 0, 0, 0, 0, 0, 0 }; #if defined(_MSC_VER) && defined(_ARM_) -#pragma optimize("g", off) +# 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); - } + 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); + 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; + 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; - } + 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; + 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); + err: + if (DB) + OPENSSL_free(DB); + EVP_MD_CTX_cleanup(&ctx); - return ret; + 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); - } + 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; + 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; + 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; - } + 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); + 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; + /* Generate dbMask in place then perform XOR on it */ + if (PKCS1_MGF1(EM, maskedDBLen, H, hLen, mgf1Hash)) + goto err; - p = EM; + 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); + /* + * 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 */ + /* H is already in place so just set final 0xbc */ - EM[emLen - 1] = 0xbc; + EM[emLen - 1] = 0xbc; - ret = 1; + ret = 1; - err: - if (salt) - OPENSSL_free(salt); + err: + if (salt) + OPENSSL_free(salt); - return ret; + return ret; - } +} #if defined(_MSC_VER) -#pragma optimize("",on) +# pragma optimize("",on) #endif |