rsa_pss.c revision 656d9c7f52f88b3a3daccafa7655dec086c4756e
1656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project/* rsa_pss.c */ 2656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL 3656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * project 2005. 4656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project */ 5656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project/* ==================================================================== 6656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * Copyright (c) 2005 The OpenSSL Project. All rights reserved. 7656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 8656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * Redistribution and use in source and binary forms, with or without 9656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * modification, are permitted provided that the following conditions 10656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * are met: 11656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 12656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 1. Redistributions of source code must retain the above copyright 13656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * notice, this list of conditions and the following disclaimer. 14656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 15656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 2. Redistributions in binary form must reproduce the above copyright 16656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * notice, this list of conditions and the following disclaimer in 17656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * the documentation and/or other materials provided with the 18656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * distribution. 19656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 20656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 3. All advertising materials mentioning features or use of this 21656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * software must display the following acknowledgment: 22656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * "This product includes software developed by the OpenSSL Project 23656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 24656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 25656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * endorse or promote products derived from this software without 27656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * prior written permission. For written permission, please contact 28656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * licensing@OpenSSL.org. 29656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 30656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 5. Products derived from this software may not be called "OpenSSL" 31656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * nor may "OpenSSL" appear in their names without prior written 32656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * permission of the OpenSSL Project. 33656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 34656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 6. Redistributions of any form whatsoever must retain the following 35656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * acknowledgment: 36656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * "This product includes software developed by the OpenSSL Project 37656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 38656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 39656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * OF THE POSSIBILITY OF SUCH DAMAGE. 51656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * ==================================================================== 52656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 53656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * This product includes cryptographic software written by Eric Young 54656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * (eay@cryptsoft.com). This product includes software written by Tim 55656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * Hudson (tjh@cryptsoft.com). 56656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 57656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project */ 58656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 59656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#include <stdio.h> 60656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#include "cryptlib.h" 61656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#include <openssl/bn.h> 62656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#include <openssl/rsa.h> 63656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#include <openssl/evp.h> 64656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#include <openssl/rand.h> 65656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#include <openssl/sha.h> 66656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 67656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Projectstatic const unsigned char zeroes[] = {0,0,0,0,0,0,0,0}; 68656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 69656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#if defined(_MSC_VER) && defined(_ARM_) 70656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#pragma optimize("g", off) 71656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#endif 72656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 73656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Projectint RSA_verify_PKCS1_PSS(RSA *rsa, const unsigned char *mHash, 74656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project const EVP_MD *Hash, const unsigned char *EM, int sLen) 75656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 76656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project int i; 77656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project int ret = 0; 78656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project int hLen, maskedDBLen, MSBits, emLen; 79656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project const unsigned char *H; 80656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project unsigned char *DB = NULL; 81656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project EVP_MD_CTX ctx; 82656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project unsigned char H_[EVP_MAX_MD_SIZE]; 83656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 84656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project hLen = EVP_MD_size(Hash); 85656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project /* 86656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * Negative sLen has special meanings: 87656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * -1 sLen == hLen 88656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * -2 salt length is autorecovered from signature 89656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * -N reserved 90656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project */ 91656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (sLen == -1) sLen = hLen; 92656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project else if (sLen == -2) sLen = -2; 93656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project else if (sLen < -2) 94656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 95656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_SLEN_CHECK_FAILED); 96656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project goto err; 97656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 98656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 99656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project MSBits = (BN_num_bits(rsa->n) - 1) & 0x7; 100656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project emLen = RSA_size(rsa); 101656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (EM[0] & (0xFF << MSBits)) 102656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 103656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_FIRST_OCTET_INVALID); 104656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project goto err; 105656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 106656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (MSBits == 0) 107656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 108656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project EM++; 109656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project emLen--; 110656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 111656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (emLen < (hLen + sLen + 2)) /* sLen can be small negative */ 112656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 113656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_DATA_TOO_LARGE); 114656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project goto err; 115656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 116656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (EM[emLen - 1] != 0xbc) 117656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 118656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_LAST_OCTET_INVALID); 119656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project goto err; 120656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 121656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project maskedDBLen = emLen - hLen - 1; 122656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project H = EM + maskedDBLen; 123656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project DB = OPENSSL_malloc(maskedDBLen); 124656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!DB) 125656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 126656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, ERR_R_MALLOC_FAILURE); 127656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project goto err; 128656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 129656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project PKCS1_MGF1(DB, maskedDBLen, H, hLen, Hash); 130656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project for (i = 0; i < maskedDBLen; i++) 131656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project DB[i] ^= EM[i]; 132656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (MSBits) 133656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project DB[0] &= 0xFF >> (8 - MSBits); 134656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project for (i = 0; DB[i] == 0 && i < (maskedDBLen-1); i++) ; 135656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (DB[i++] != 0x1) 136656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 137656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_SLEN_RECOVERY_FAILED); 138656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project goto err; 139656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 140656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (sLen >= 0 && (maskedDBLen - i) != sLen) 141656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 142656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_SLEN_CHECK_FAILED); 143656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project goto err; 144656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 145656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project EVP_MD_CTX_init(&ctx); 146656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project EVP_DigestInit_ex(&ctx, Hash, NULL); 147656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project EVP_DigestUpdate(&ctx, zeroes, sizeof zeroes); 148656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project EVP_DigestUpdate(&ctx, mHash, hLen); 149656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (maskedDBLen - i) 150656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project EVP_DigestUpdate(&ctx, DB + i, maskedDBLen - i); 151656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project EVP_DigestFinal(&ctx, H_, NULL); 152656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project EVP_MD_CTX_cleanup(&ctx); 153656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (memcmp(H_, H, hLen)) 154656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 155656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_BAD_SIGNATURE); 156656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ret = 0; 157656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 158656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project else 159656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ret = 1; 160656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 161656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project err: 162656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (DB) 163656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project OPENSSL_free(DB); 164656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 165656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return ret; 166656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 167656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 168656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 169656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Projectint RSA_padding_add_PKCS1_PSS(RSA *rsa, unsigned char *EM, 170656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project const unsigned char *mHash, 171656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project const EVP_MD *Hash, int sLen) 172656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 173656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project int i; 174656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project int ret = 0; 175656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project int hLen, maskedDBLen, MSBits, emLen; 176656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project unsigned char *H, *salt = NULL, *p; 177656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project EVP_MD_CTX ctx; 178656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 179656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project hLen = EVP_MD_size(Hash); 180656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project /* 181656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * Negative sLen has special meanings: 182656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * -1 sLen == hLen 183656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * -2 salt length is maximized 184656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * -N reserved 185656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project */ 186656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (sLen == -1) sLen = hLen; 187656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project else if (sLen == -2) sLen = -2; 188656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project else if (sLen < -2) 189656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 190656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS, RSA_R_SLEN_CHECK_FAILED); 191656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project goto err; 192656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 193656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 194656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project MSBits = (BN_num_bits(rsa->n) - 1) & 0x7; 195656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project emLen = RSA_size(rsa); 196656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (MSBits == 0) 197656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 198656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project *EM++ = 0; 199656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project emLen--; 200656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 201656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (sLen == -2) 202656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 203656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project sLen = emLen - hLen - 2; 204656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 205656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project else if (emLen < (hLen + sLen + 2)) 206656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 207656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS, 208656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE); 209656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project goto err; 210656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 211656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (sLen > 0) 212656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 213656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project salt = OPENSSL_malloc(sLen); 214656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!salt) 215656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 216656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS, 217656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ERR_R_MALLOC_FAILURE); 218656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project goto err; 219656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 220656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!RAND_bytes(salt, sLen)) 221656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project goto err; 222656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 223656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project maskedDBLen = emLen - hLen - 1; 224656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project H = EM + maskedDBLen; 225656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project EVP_MD_CTX_init(&ctx); 226656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project EVP_DigestInit_ex(&ctx, Hash, NULL); 227656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project EVP_DigestUpdate(&ctx, zeroes, sizeof zeroes); 228656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project EVP_DigestUpdate(&ctx, mHash, hLen); 229656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (sLen) 230656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project EVP_DigestUpdate(&ctx, salt, sLen); 231656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project EVP_DigestFinal(&ctx, H, NULL); 232656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project EVP_MD_CTX_cleanup(&ctx); 233656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 234656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project /* Generate dbMask in place then perform XOR on it */ 235656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project PKCS1_MGF1(EM, maskedDBLen, H, hLen, Hash); 236656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 237656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project p = EM; 238656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 239656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project /* Initial PS XORs with all zeroes which is a NOP so just update 240656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * pointer. Note from a test above this value is guaranteed to 241656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * be non-negative. 242656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project */ 243656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project p += emLen - sLen - hLen - 2; 244656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project *p++ ^= 0x1; 245656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (sLen > 0) 246656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 247656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project for (i = 0; i < sLen; i++) 248656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project *p++ ^= salt[i]; 249656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 250656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (MSBits) 251656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project EM[0] &= 0xFF >> (8 - MSBits); 252656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 253656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project /* H is already in place so just set final 0xbc */ 254656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 255656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project EM[emLen - 1] = 0xbc; 256656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 257656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ret = 1; 258656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 259656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project err: 260656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (salt) 261656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project OPENSSL_free(salt); 262656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 263656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return ret; 264656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 265656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 266656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 267656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#if defined(_MSC_VER) 268656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#pragma optimize("",on) 269656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#endif 270