1d9e397b599b13d642138480a28c14db7a136bf0Adam Langley/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 2d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * All rights reserved. 3d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * 4d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * This package is an SSL implementation written 5d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * by Eric Young (eay@cryptsoft.com). 6d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * The implementation was written so as to conform with Netscapes SSL. 7d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * 8d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * This library is free for commercial and non-commercial use as long as 9d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * the following conditions are aheared to. The following conditions 10d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * apply to all code found in this distribution, be it the RC4, RSA, 11d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * lhash, DES, etc., code; not just the SSL code. The SSL documentation 12d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * included with this distribution is covered by the same copyright terms 13d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * except that the holder is Tim Hudson (tjh@cryptsoft.com). 14d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * 15d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * Copyright remains Eric Young's, and as such any Copyright notices in 16d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * the code are not to be removed. 17d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * If this package is used in a product, Eric Young should be given attribution 18d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * as the author of the parts of the library used. 19d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * This can be in the form of a textual message at program startup or 20d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * in documentation (online or textual) provided with the package. 21d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * 22d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * Redistribution and use in source and binary forms, with or without 23d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * modification, are permitted provided that the following conditions 24d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * are met: 25d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * 1. Redistributions of source code must retain the copyright 26d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * notice, this list of conditions and the following disclaimer. 27d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * 2. Redistributions in binary form must reproduce the above copyright 28d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * notice, this list of conditions and the following disclaimer in the 29d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * documentation and/or other materials provided with the distribution. 30d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * 3. All advertising materials mentioning features or use of this software 31d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * must display the following acknowledgement: 32d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * "This product includes cryptographic software written by 33d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * Eric Young (eay@cryptsoft.com)" 34d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * The word 'cryptographic' can be left out if the rouines from the library 35d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * being used are not cryptographic related :-). 36d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * 4. If you include any Windows specific code (or a derivative thereof) from 37d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * the apps directory (application code) you must include an acknowledgement: 38d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 39d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * 40d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 41d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 44d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * SUCH DAMAGE. 51d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * 52d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * The licence and distribution terms for any publically available version or 53d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * derivative of this code cannot be changed. i.e. this code cannot simply be 54d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * copied and put under another distribution licence 55d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * [including the GNU Public Licence.] */ 56d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 57d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#include <openssl/aead.h> 58d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 59d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#include <assert.h> 60d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#include <string.h> 61d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 62d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#include <openssl/cipher.h> 63d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#include <openssl/cpu.h> 64d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#include <openssl/err.h> 65d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#include <openssl/md5.h> 66d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#include <openssl/mem.h> 67d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#include <openssl/obj.h> 68d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#include <openssl/rc4.h> 69d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 70d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#include "internal.h" 71d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 72d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 73d9e397b599b13d642138480a28c14db7a136bf0Adam Langleystatic int rc4_init_key(EVP_CIPHER_CTX *ctx, const uint8_t *key, 74d9e397b599b13d642138480a28c14db7a136bf0Adam Langley const uint8_t *iv, int enc) { 75d9e397b599b13d642138480a28c14db7a136bf0Adam Langley RC4_KEY *rc4key = (RC4_KEY *)ctx->cipher_data; 76d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 77d9e397b599b13d642138480a28c14db7a136bf0Adam Langley RC4_set_key(rc4key, EVP_CIPHER_CTX_key_length(ctx), key); 78d9e397b599b13d642138480a28c14db7a136bf0Adam Langley return 1; 79d9e397b599b13d642138480a28c14db7a136bf0Adam Langley} 80d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 81d9e397b599b13d642138480a28c14db7a136bf0Adam Langleystatic int rc4_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out, const uint8_t *in, 82d9e397b599b13d642138480a28c14db7a136bf0Adam Langley size_t in_len) { 83d9e397b599b13d642138480a28c14db7a136bf0Adam Langley RC4_KEY *rc4key = (RC4_KEY *)ctx->cipher_data; 84d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 85d9e397b599b13d642138480a28c14db7a136bf0Adam Langley RC4(rc4key, in_len, in, out); 86d9e397b599b13d642138480a28c14db7a136bf0Adam Langley return 1; 87d9e397b599b13d642138480a28c14db7a136bf0Adam Langley} 88d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 89d9e397b599b13d642138480a28c14db7a136bf0Adam Langleystatic const EVP_CIPHER rc4 = { 90d9e397b599b13d642138480a28c14db7a136bf0Adam Langley NID_rc4, 1 /* block_size */, 16 /* key_size */, 91d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 0 /* iv_len */, sizeof(RC4_KEY), EVP_CIPH_VARIABLE_LENGTH, 92d9e397b599b13d642138480a28c14db7a136bf0Adam Langley NULL /* app_data */, rc4_init_key, rc4_cipher, 93d9e397b599b13d642138480a28c14db7a136bf0Adam Langley NULL /* cleanup */, NULL /* ctrl */, }; 94d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 95d9e397b599b13d642138480a28c14db7a136bf0Adam Langleyconst EVP_CIPHER *EVP_rc4(void) { return &rc4; } 96d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 97d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 98d9e397b599b13d642138480a28c14db7a136bf0Adam Langleystruct aead_rc4_md5_tls_ctx { 99d9e397b599b13d642138480a28c14db7a136bf0Adam Langley RC4_KEY rc4; 100d9e397b599b13d642138480a28c14db7a136bf0Adam Langley MD5_CTX head, tail, md; 101d9e397b599b13d642138480a28c14db7a136bf0Adam Langley size_t payload_length; 102d9e397b599b13d642138480a28c14db7a136bf0Adam Langley unsigned char tag_len; 103d9e397b599b13d642138480a28c14db7a136bf0Adam Langley}; 104d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 105d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 106d9e397b599b13d642138480a28c14db7a136bf0Adam Langleystatic int 107d9e397b599b13d642138480a28c14db7a136bf0Adam Langleyaead_rc4_md5_tls_init(EVP_AEAD_CTX *ctx, const uint8_t *key, size_t key_len, 108d9e397b599b13d642138480a28c14db7a136bf0Adam Langley size_t tag_len) { 109d9e397b599b13d642138480a28c14db7a136bf0Adam Langley struct aead_rc4_md5_tls_ctx *rc4_ctx; 110d9e397b599b13d642138480a28c14db7a136bf0Adam Langley size_t i; 111d9e397b599b13d642138480a28c14db7a136bf0Adam Langley uint8_t hmac_key[MD5_CBLOCK]; 112d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 113d9e397b599b13d642138480a28c14db7a136bf0Adam Langley if (tag_len == EVP_AEAD_DEFAULT_TAG_LENGTH) { 114d9e397b599b13d642138480a28c14db7a136bf0Adam Langley tag_len = MD5_DIGEST_LENGTH; 115d9e397b599b13d642138480a28c14db7a136bf0Adam Langley } 116d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 117d9e397b599b13d642138480a28c14db7a136bf0Adam Langley if (tag_len > MD5_DIGEST_LENGTH) { 118d9e397b599b13d642138480a28c14db7a136bf0Adam Langley OPENSSL_PUT_ERROR(CIPHER, aead_rc4_md5_tls_init, CIPHER_R_TOO_LARGE); 119d9e397b599b13d642138480a28c14db7a136bf0Adam Langley return 0; 120d9e397b599b13d642138480a28c14db7a136bf0Adam Langley } 121d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 122d9e397b599b13d642138480a28c14db7a136bf0Adam Langley /* The keys consists of |MD5_DIGEST_LENGTH| bytes of HMAC(MD5) key followed 123d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * by some number of bytes of RC4 key. */ 124d9e397b599b13d642138480a28c14db7a136bf0Adam Langley if (key_len <= MD5_DIGEST_LENGTH) { 125d9e397b599b13d642138480a28c14db7a136bf0Adam Langley OPENSSL_PUT_ERROR(CIPHER, aead_rc4_md5_tls_init, CIPHER_R_BAD_KEY_LENGTH); 126d9e397b599b13d642138480a28c14db7a136bf0Adam Langley return 0; 127d9e397b599b13d642138480a28c14db7a136bf0Adam Langley } 128d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 129d9e397b599b13d642138480a28c14db7a136bf0Adam Langley rc4_ctx = OPENSSL_malloc(sizeof(struct aead_rc4_md5_tls_ctx)); 130d9e397b599b13d642138480a28c14db7a136bf0Adam Langley if (rc4_ctx == NULL) { 131d9e397b599b13d642138480a28c14db7a136bf0Adam Langley OPENSSL_PUT_ERROR(CIPHER, aead_rc4_md5_tls_init, ERR_R_MALLOC_FAILURE); 132d9e397b599b13d642138480a28c14db7a136bf0Adam Langley return 0; 133d9e397b599b13d642138480a28c14db7a136bf0Adam Langley } 134d9e397b599b13d642138480a28c14db7a136bf0Adam Langley memset(rc4_ctx, 0, sizeof(struct aead_rc4_md5_tls_ctx)); 135d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 136d9e397b599b13d642138480a28c14db7a136bf0Adam Langley RC4_set_key(&rc4_ctx->rc4, key_len - MD5_DIGEST_LENGTH, 137d9e397b599b13d642138480a28c14db7a136bf0Adam Langley key + MD5_DIGEST_LENGTH); 138d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 139d9e397b599b13d642138480a28c14db7a136bf0Adam Langley memset(hmac_key, 0, sizeof(hmac_key)); 140d9e397b599b13d642138480a28c14db7a136bf0Adam Langley memcpy(hmac_key, key, MD5_DIGEST_LENGTH); 141d9e397b599b13d642138480a28c14db7a136bf0Adam Langley for (i = 0; i < sizeof(hmac_key); i++) { 142d9e397b599b13d642138480a28c14db7a136bf0Adam Langley hmac_key[i] ^= 0x36; 143d9e397b599b13d642138480a28c14db7a136bf0Adam Langley } 144d9e397b599b13d642138480a28c14db7a136bf0Adam Langley MD5_Init(&rc4_ctx->head); 145d9e397b599b13d642138480a28c14db7a136bf0Adam Langley MD5_Update(&rc4_ctx->head, hmac_key, sizeof(hmac_key)); 146d9e397b599b13d642138480a28c14db7a136bf0Adam Langley for (i = 0; i < sizeof(hmac_key); i++) { 147d9e397b599b13d642138480a28c14db7a136bf0Adam Langley hmac_key[i] ^= 0x36 ^ 0x5c; 148d9e397b599b13d642138480a28c14db7a136bf0Adam Langley } 149d9e397b599b13d642138480a28c14db7a136bf0Adam Langley MD5_Init(&rc4_ctx->tail); 150d9e397b599b13d642138480a28c14db7a136bf0Adam Langley MD5_Update(&rc4_ctx->tail, hmac_key, sizeof(hmac_key)); 151d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 152d9e397b599b13d642138480a28c14db7a136bf0Adam Langley rc4_ctx->tag_len = tag_len; 153d9e397b599b13d642138480a28c14db7a136bf0Adam Langley ctx->aead_state = rc4_ctx; 154d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 155d9e397b599b13d642138480a28c14db7a136bf0Adam Langley return 1; 156d9e397b599b13d642138480a28c14db7a136bf0Adam Langley} 157d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 158d9e397b599b13d642138480a28c14db7a136bf0Adam Langleystatic void aead_rc4_md5_tls_cleanup(EVP_AEAD_CTX *ctx) { 159d9e397b599b13d642138480a28c14db7a136bf0Adam Langley struct aead_rc4_md5_tls_ctx *rc4_ctx = ctx->aead_state; 160d9e397b599b13d642138480a28c14db7a136bf0Adam Langley OPENSSL_cleanse(rc4_ctx, sizeof(struct aead_rc4_md5_tls_ctx)); 161d9e397b599b13d642138480a28c14db7a136bf0Adam Langley OPENSSL_free(rc4_ctx); 162d9e397b599b13d642138480a28c14db7a136bf0Adam Langley} 163d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 164d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#if !defined(OPENSSL_NO_ASM) && defined(OPENSSL_X86_64) 165d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#define STITCHED_CALL 166d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 167d9e397b599b13d642138480a28c14db7a136bf0Adam Langley/* rc4_md5_enc is defined in rc4_md5-x86_64.pl */ 168d9e397b599b13d642138480a28c14db7a136bf0Adam Langleyvoid rc4_md5_enc(RC4_KEY *key, const void *in0, void *out, MD5_CTX *ctx, 169d9e397b599b13d642138480a28c14db7a136bf0Adam Langley const void *inp, size_t blocks); 170d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#endif 171d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 172d9e397b599b13d642138480a28c14db7a136bf0Adam Langleystatic int aead_rc4_md5_tls_seal(const EVP_AEAD_CTX *ctx, uint8_t *out, 173d9e397b599b13d642138480a28c14db7a136bf0Adam Langley size_t *out_len, size_t max_out_len, 174d9e397b599b13d642138480a28c14db7a136bf0Adam Langley const uint8_t *nonce, size_t nonce_len, 175d9e397b599b13d642138480a28c14db7a136bf0Adam Langley const uint8_t *in, size_t in_len, 176d9e397b599b13d642138480a28c14db7a136bf0Adam Langley const uint8_t *ad, size_t ad_len) { 177d9e397b599b13d642138480a28c14db7a136bf0Adam Langley struct aead_rc4_md5_tls_ctx *rc4_ctx = ctx->aead_state; 178d9e397b599b13d642138480a28c14db7a136bf0Adam Langley MD5_CTX md; 179d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#if defined(STITCHED_CALL) 180d9e397b599b13d642138480a28c14db7a136bf0Adam Langley size_t rc4_off, md5_off, blocks; 181d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#else 182d9e397b599b13d642138480a28c14db7a136bf0Adam Langley const size_t rc4_off = 0; 183d9e397b599b13d642138480a28c14db7a136bf0Adam Langley const size_t md5_off = 0; 184d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#endif 185d9e397b599b13d642138480a28c14db7a136bf0Adam Langley uint8_t digest[MD5_DIGEST_LENGTH]; 186d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 187d9e397b599b13d642138480a28c14db7a136bf0Adam Langley if (in_len + rc4_ctx->tag_len < in_len) { 188d9e397b599b13d642138480a28c14db7a136bf0Adam Langley OPENSSL_PUT_ERROR(CIPHER, aead_rc4_md5_tls_seal, CIPHER_R_TOO_LARGE); 189d9e397b599b13d642138480a28c14db7a136bf0Adam Langley return 0; 190d9e397b599b13d642138480a28c14db7a136bf0Adam Langley } 191d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 192d9e397b599b13d642138480a28c14db7a136bf0Adam Langley if (nonce_len != 0) { 193d9e397b599b13d642138480a28c14db7a136bf0Adam Langley OPENSSL_PUT_ERROR(CIPHER, aead_rc4_md5_tls_seal, CIPHER_R_IV_TOO_LARGE); 194d9e397b599b13d642138480a28c14db7a136bf0Adam Langley return 0; 195d9e397b599b13d642138480a28c14db7a136bf0Adam Langley } 196d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 197d9e397b599b13d642138480a28c14db7a136bf0Adam Langley if (max_out_len < in_len + rc4_ctx->tag_len) { 198d9e397b599b13d642138480a28c14db7a136bf0Adam Langley OPENSSL_PUT_ERROR(CIPHER, aead_rc4_md5_tls_seal, CIPHER_R_BUFFER_TOO_SMALL); 199d9e397b599b13d642138480a28c14db7a136bf0Adam Langley return 0; 200d9e397b599b13d642138480a28c14db7a136bf0Adam Langley } 201d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 202d9e397b599b13d642138480a28c14db7a136bf0Adam Langley if (nonce_len != 0) { 203d9e397b599b13d642138480a28c14db7a136bf0Adam Langley OPENSSL_PUT_ERROR(CIPHER, aead_rc4_md5_tls_seal, CIPHER_R_TOO_LARGE); 204d9e397b599b13d642138480a28c14db7a136bf0Adam Langley return 0; 205d9e397b599b13d642138480a28c14db7a136bf0Adam Langley } 206d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 207d9e397b599b13d642138480a28c14db7a136bf0Adam Langley memcpy(&md, &rc4_ctx->head, sizeof(MD5_CTX)); 208d9e397b599b13d642138480a28c14db7a136bf0Adam Langley /* The MAC's payload begins with the additional data. See 209d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * https://tools.ietf.org/html/rfc5246#section-6.2.3.1 */ 210d9e397b599b13d642138480a28c14db7a136bf0Adam Langley MD5_Update(&md, ad, ad_len); 211d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 212d9e397b599b13d642138480a28c14db7a136bf0Adam Langley /* To allow for CBC mode which changes cipher length, |ad| doesn't include the 213d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * length for legacy ciphers. */ 214d9e397b599b13d642138480a28c14db7a136bf0Adam Langley uint8_t ad_extra[2]; 215d9e397b599b13d642138480a28c14db7a136bf0Adam Langley ad_extra[0] = (uint8_t)(in_len >> 8); 216d9e397b599b13d642138480a28c14db7a136bf0Adam Langley ad_extra[1] = (uint8_t)(in_len & 0xff); 217d9e397b599b13d642138480a28c14db7a136bf0Adam Langley MD5_Update(&md, ad_extra, sizeof(ad_extra)); 218d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 219d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#if defined(STITCHED_CALL) 220d9e397b599b13d642138480a28c14db7a136bf0Adam Langley /* 32 is $MOD from rc4_md5-x86_64.pl. */ 221d9e397b599b13d642138480a28c14db7a136bf0Adam Langley rc4_off = 32 - 1 - (rc4_ctx->rc4.x & (32 - 1)); 222d9e397b599b13d642138480a28c14db7a136bf0Adam Langley md5_off = MD5_CBLOCK - md.num; 223d9e397b599b13d642138480a28c14db7a136bf0Adam Langley /* Ensure RC4 is behind MD5. */ 224d9e397b599b13d642138480a28c14db7a136bf0Adam Langley if (rc4_off > md5_off) { 225d9e397b599b13d642138480a28c14db7a136bf0Adam Langley md5_off += MD5_CBLOCK; 226d9e397b599b13d642138480a28c14db7a136bf0Adam Langley } 227d9e397b599b13d642138480a28c14db7a136bf0Adam Langley assert(md5_off >= rc4_off); 228d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 229d9e397b599b13d642138480a28c14db7a136bf0Adam Langley if (in_len > md5_off && (blocks = (in_len - md5_off) / MD5_CBLOCK) && 230d9e397b599b13d642138480a28c14db7a136bf0Adam Langley (OPENSSL_ia32cap_P[0] & (1 << 20)) == 0) { 231d9e397b599b13d642138480a28c14db7a136bf0Adam Langley /* Process the initial portions of the plaintext normally. */ 232d9e397b599b13d642138480a28c14db7a136bf0Adam Langley MD5_Update(&md, in, md5_off); 233d9e397b599b13d642138480a28c14db7a136bf0Adam Langley RC4(&rc4_ctx->rc4, rc4_off, in, out); 234d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 235d9e397b599b13d642138480a28c14db7a136bf0Adam Langley /* Process the next |blocks| blocks of plaintext with stitched routines. */ 236d9e397b599b13d642138480a28c14db7a136bf0Adam Langley rc4_md5_enc(&rc4_ctx->rc4, in + rc4_off, out + rc4_off, &md, in + md5_off, 237d9e397b599b13d642138480a28c14db7a136bf0Adam Langley blocks); 238d9e397b599b13d642138480a28c14db7a136bf0Adam Langley blocks *= MD5_CBLOCK; 239d9e397b599b13d642138480a28c14db7a136bf0Adam Langley rc4_off += blocks; 240d9e397b599b13d642138480a28c14db7a136bf0Adam Langley md5_off += blocks; 241d9e397b599b13d642138480a28c14db7a136bf0Adam Langley md.Nh += blocks >> 29; 242d9e397b599b13d642138480a28c14db7a136bf0Adam Langley md.Nl += blocks <<= 3; 243d9e397b599b13d642138480a28c14db7a136bf0Adam Langley if (md.Nl < (unsigned int)blocks) { 244d9e397b599b13d642138480a28c14db7a136bf0Adam Langley md.Nh++; 245d9e397b599b13d642138480a28c14db7a136bf0Adam Langley } 246d9e397b599b13d642138480a28c14db7a136bf0Adam Langley } else { 247d9e397b599b13d642138480a28c14db7a136bf0Adam Langley rc4_off = 0; 248d9e397b599b13d642138480a28c14db7a136bf0Adam Langley md5_off = 0; 249d9e397b599b13d642138480a28c14db7a136bf0Adam Langley } 250d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#endif 251d9e397b599b13d642138480a28c14db7a136bf0Adam Langley /* Finish computing the MAC. */ 252d9e397b599b13d642138480a28c14db7a136bf0Adam Langley MD5_Update(&md, in + md5_off, in_len - md5_off); 253d9e397b599b13d642138480a28c14db7a136bf0Adam Langley MD5_Final(digest, &md); 254d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 255d9e397b599b13d642138480a28c14db7a136bf0Adam Langley memcpy(&md, &rc4_ctx->tail, sizeof(MD5_CTX)); 256d9e397b599b13d642138480a28c14db7a136bf0Adam Langley MD5_Update(&md, digest, sizeof(digest)); 257d9e397b599b13d642138480a28c14db7a136bf0Adam Langley if (rc4_ctx->tag_len == MD5_DIGEST_LENGTH) { 258d9e397b599b13d642138480a28c14db7a136bf0Adam Langley MD5_Final(out + in_len, &md); 259d9e397b599b13d642138480a28c14db7a136bf0Adam Langley } else { 260d9e397b599b13d642138480a28c14db7a136bf0Adam Langley MD5_Final(digest, &md); 261d9e397b599b13d642138480a28c14db7a136bf0Adam Langley memcpy(out + in_len, digest, rc4_ctx->tag_len); 262d9e397b599b13d642138480a28c14db7a136bf0Adam Langley } 263d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 264d9e397b599b13d642138480a28c14db7a136bf0Adam Langley /* Encrypt the remainder of the plaintext and the MAC. */ 265d9e397b599b13d642138480a28c14db7a136bf0Adam Langley RC4(&rc4_ctx->rc4, in_len - rc4_off, in + rc4_off, out + rc4_off); 266d9e397b599b13d642138480a28c14db7a136bf0Adam Langley RC4(&rc4_ctx->rc4, MD5_DIGEST_LENGTH, out + in_len, out + in_len); 267d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 268d9e397b599b13d642138480a28c14db7a136bf0Adam Langley *out_len = in_len + rc4_ctx->tag_len; 269d9e397b599b13d642138480a28c14db7a136bf0Adam Langley return 1; 270d9e397b599b13d642138480a28c14db7a136bf0Adam Langley} 271d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 272d9e397b599b13d642138480a28c14db7a136bf0Adam Langleystatic int aead_rc4_md5_tls_open(const EVP_AEAD_CTX *ctx, uint8_t *out, 273d9e397b599b13d642138480a28c14db7a136bf0Adam Langley size_t *out_len, size_t max_out_len, 274d9e397b599b13d642138480a28c14db7a136bf0Adam Langley const uint8_t *nonce, size_t nonce_len, 275d9e397b599b13d642138480a28c14db7a136bf0Adam Langley const uint8_t *in, size_t in_len, 276d9e397b599b13d642138480a28c14db7a136bf0Adam Langley const uint8_t *ad, size_t ad_len) { 277d9e397b599b13d642138480a28c14db7a136bf0Adam Langley struct aead_rc4_md5_tls_ctx *rc4_ctx = ctx->aead_state; 278d9e397b599b13d642138480a28c14db7a136bf0Adam Langley MD5_CTX md; 279d9e397b599b13d642138480a28c14db7a136bf0Adam Langley size_t plaintext_len; 280d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#if defined(STITCHED_CALL) 281d9e397b599b13d642138480a28c14db7a136bf0Adam Langley unsigned int l; 282d9e397b599b13d642138480a28c14db7a136bf0Adam Langley size_t rc4_off, md5_off, blocks; 283d9e397b599b13d642138480a28c14db7a136bf0Adam Langley extern unsigned int OPENSSL_ia32cap_P[]; 284d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#else 285d9e397b599b13d642138480a28c14db7a136bf0Adam Langley const size_t rc4_off = 0; 286d9e397b599b13d642138480a28c14db7a136bf0Adam Langley const size_t md5_off = 0; 287d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#endif 288d9e397b599b13d642138480a28c14db7a136bf0Adam Langley uint8_t digest[MD5_DIGEST_LENGTH]; 289d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 290d9e397b599b13d642138480a28c14db7a136bf0Adam Langley if (in_len < rc4_ctx->tag_len) { 291d9e397b599b13d642138480a28c14db7a136bf0Adam Langley OPENSSL_PUT_ERROR(CIPHER, aead_rc4_md5_tls_open, CIPHER_R_BAD_DECRYPT); 292d9e397b599b13d642138480a28c14db7a136bf0Adam Langley return 0; 293d9e397b599b13d642138480a28c14db7a136bf0Adam Langley } 294d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 295d9e397b599b13d642138480a28c14db7a136bf0Adam Langley plaintext_len = in_len - rc4_ctx->tag_len; 296d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 297d9e397b599b13d642138480a28c14db7a136bf0Adam Langley if (nonce_len != 0) { 298d9e397b599b13d642138480a28c14db7a136bf0Adam Langley OPENSSL_PUT_ERROR(CIPHER, aead_rc4_md5_tls_open, CIPHER_R_TOO_LARGE); 299d9e397b599b13d642138480a28c14db7a136bf0Adam Langley return 0; 300d9e397b599b13d642138480a28c14db7a136bf0Adam Langley } 301d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 302e9ada863a7b3e81f5d2b1e3bdd2305da902a87f5Adam Langley if (max_out_len < in_len) { 303e9ada863a7b3e81f5d2b1e3bdd2305da902a87f5Adam Langley /* This requires that the caller provide space for the MAC, even though it 304e9ada863a7b3e81f5d2b1e3bdd2305da902a87f5Adam Langley * will always be removed on return. */ 305d9e397b599b13d642138480a28c14db7a136bf0Adam Langley OPENSSL_PUT_ERROR(CIPHER, aead_rc4_md5_tls_open, CIPHER_R_BUFFER_TOO_SMALL); 306d9e397b599b13d642138480a28c14db7a136bf0Adam Langley return 0; 307d9e397b599b13d642138480a28c14db7a136bf0Adam Langley } 308d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 309d9e397b599b13d642138480a28c14db7a136bf0Adam Langley memcpy(&md, &rc4_ctx->head, sizeof(MD5_CTX)); 310d9e397b599b13d642138480a28c14db7a136bf0Adam Langley /* The MAC's payload begins with the additional data. See 311d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * https://tools.ietf.org/html/rfc5246#section-6.2.3.1 */ 312d9e397b599b13d642138480a28c14db7a136bf0Adam Langley MD5_Update(&md, ad, ad_len); 313d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 314d9e397b599b13d642138480a28c14db7a136bf0Adam Langley /* To allow for CBC mode which changes cipher length, |ad| doesn't include the 315d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * length for legacy ciphers. */ 316d9e397b599b13d642138480a28c14db7a136bf0Adam Langley uint8_t ad_extra[2]; 317d9e397b599b13d642138480a28c14db7a136bf0Adam Langley ad_extra[0] = (uint8_t)(plaintext_len >> 8); 318d9e397b599b13d642138480a28c14db7a136bf0Adam Langley ad_extra[1] = (uint8_t)(plaintext_len & 0xff); 319d9e397b599b13d642138480a28c14db7a136bf0Adam Langley MD5_Update(&md, ad_extra, sizeof(ad_extra)); 320d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 321d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#if defined(STITCHED_CALL) 322d9e397b599b13d642138480a28c14db7a136bf0Adam Langley rc4_off = 32 - 1 - (rc4_ctx->rc4.x & (32 - 1)); 323d9e397b599b13d642138480a28c14db7a136bf0Adam Langley md5_off = MD5_CBLOCK - md.num; 324d9e397b599b13d642138480a28c14db7a136bf0Adam Langley /* Ensure MD5 is a full block behind RC4 so it has plaintext to operate on in 325d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * both normal and stitched routines. */ 326d9e397b599b13d642138480a28c14db7a136bf0Adam Langley if (md5_off > rc4_off) { 327d9e397b599b13d642138480a28c14db7a136bf0Adam Langley rc4_off += 2 * MD5_CBLOCK; 328d9e397b599b13d642138480a28c14db7a136bf0Adam Langley } else { 329d9e397b599b13d642138480a28c14db7a136bf0Adam Langley rc4_off += MD5_CBLOCK; 330d9e397b599b13d642138480a28c14db7a136bf0Adam Langley } 331d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 332d9e397b599b13d642138480a28c14db7a136bf0Adam Langley if (in_len > rc4_off && (blocks = (in_len - rc4_off) / MD5_CBLOCK) && 333d9e397b599b13d642138480a28c14db7a136bf0Adam Langley (OPENSSL_ia32cap_P[0] & (1 << 20)) == 0) { 334d9e397b599b13d642138480a28c14db7a136bf0Adam Langley /* Decrypt the initial portion of the ciphertext and digest the plaintext 335d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * normally. */ 336d9e397b599b13d642138480a28c14db7a136bf0Adam Langley RC4(&rc4_ctx->rc4, rc4_off, in, out); 337d9e397b599b13d642138480a28c14db7a136bf0Adam Langley MD5_Update(&md, out, md5_off); 338d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 339d9e397b599b13d642138480a28c14db7a136bf0Adam Langley /* Decrypt and digest the next |blocks| blocks of ciphertext with the 340d9e397b599b13d642138480a28c14db7a136bf0Adam Langley * stitched routines. */ 341d9e397b599b13d642138480a28c14db7a136bf0Adam Langley rc4_md5_enc(&rc4_ctx->rc4, in + rc4_off, out + rc4_off, &md, out + md5_off, 342d9e397b599b13d642138480a28c14db7a136bf0Adam Langley blocks); 343d9e397b599b13d642138480a28c14db7a136bf0Adam Langley blocks *= MD5_CBLOCK; 344d9e397b599b13d642138480a28c14db7a136bf0Adam Langley rc4_off += blocks; 345d9e397b599b13d642138480a28c14db7a136bf0Adam Langley md5_off += blocks; 346d9e397b599b13d642138480a28c14db7a136bf0Adam Langley l = (md.Nl + (blocks << 3)) & 0xffffffffU; 347d9e397b599b13d642138480a28c14db7a136bf0Adam Langley if (l < md.Nl) { 348d9e397b599b13d642138480a28c14db7a136bf0Adam Langley md.Nh++; 349d9e397b599b13d642138480a28c14db7a136bf0Adam Langley } 350d9e397b599b13d642138480a28c14db7a136bf0Adam Langley md.Nl = l; 351d9e397b599b13d642138480a28c14db7a136bf0Adam Langley md.Nh += blocks >> 29; 352d9e397b599b13d642138480a28c14db7a136bf0Adam Langley } else { 353d9e397b599b13d642138480a28c14db7a136bf0Adam Langley md5_off = 0; 354d9e397b599b13d642138480a28c14db7a136bf0Adam Langley rc4_off = 0; 355d9e397b599b13d642138480a28c14db7a136bf0Adam Langley } 356d9e397b599b13d642138480a28c14db7a136bf0Adam Langley#endif 357d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 358d9e397b599b13d642138480a28c14db7a136bf0Adam Langley /* Process the remainder of the input. */ 359d9e397b599b13d642138480a28c14db7a136bf0Adam Langley RC4(&rc4_ctx->rc4, in_len - rc4_off, in + rc4_off, out + rc4_off); 360d9e397b599b13d642138480a28c14db7a136bf0Adam Langley MD5_Update(&md, out + md5_off, plaintext_len - md5_off); 361d9e397b599b13d642138480a28c14db7a136bf0Adam Langley MD5_Final(digest, &md); 362d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 363d9e397b599b13d642138480a28c14db7a136bf0Adam Langley /* Calculate HMAC and verify it */ 364d9e397b599b13d642138480a28c14db7a136bf0Adam Langley memcpy(&md, &rc4_ctx->tail, sizeof(MD5_CTX)); 365d9e397b599b13d642138480a28c14db7a136bf0Adam Langley MD5_Update(&md, digest, MD5_DIGEST_LENGTH); 366d9e397b599b13d642138480a28c14db7a136bf0Adam Langley MD5_Final(digest, &md); 367d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 368d9e397b599b13d642138480a28c14db7a136bf0Adam Langley if (CRYPTO_memcmp(out + plaintext_len, digest, rc4_ctx->tag_len)) { 369d9e397b599b13d642138480a28c14db7a136bf0Adam Langley OPENSSL_PUT_ERROR(CIPHER, aead_rc4_md5_tls_open, CIPHER_R_BAD_DECRYPT); 370d9e397b599b13d642138480a28c14db7a136bf0Adam Langley return 0; 371d9e397b599b13d642138480a28c14db7a136bf0Adam Langley } 372d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 373d9e397b599b13d642138480a28c14db7a136bf0Adam Langley *out_len = plaintext_len; 374d9e397b599b13d642138480a28c14db7a136bf0Adam Langley return 1; 375d9e397b599b13d642138480a28c14db7a136bf0Adam Langley} 376d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 377e9ada863a7b3e81f5d2b1e3bdd2305da902a87f5Adam Langleystatic int aead_rc4_md5_tls_get_rc4_state(const EVP_AEAD_CTX *ctx, 378e9ada863a7b3e81f5d2b1e3bdd2305da902a87f5Adam Langley const RC4_KEY **out_key) { 379e9ada863a7b3e81f5d2b1e3bdd2305da902a87f5Adam Langley struct aead_rc4_md5_tls_ctx *rc4_ctx = ctx->aead_state; 380e9ada863a7b3e81f5d2b1e3bdd2305da902a87f5Adam Langley *out_key = &rc4_ctx->rc4; 381e9ada863a7b3e81f5d2b1e3bdd2305da902a87f5Adam Langley return 1; 382e9ada863a7b3e81f5d2b1e3bdd2305da902a87f5Adam Langley} 383e9ada863a7b3e81f5d2b1e3bdd2305da902a87f5Adam Langley 384d9e397b599b13d642138480a28c14db7a136bf0Adam Langleystatic const EVP_AEAD aead_rc4_md5_tls = { 385d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 16 + MD5_DIGEST_LENGTH, /* key len (RC4 + MD5) */ 386d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 0, /* nonce len */ 387d9e397b599b13d642138480a28c14db7a136bf0Adam Langley MD5_DIGEST_LENGTH, /* overhead */ 388d9e397b599b13d642138480a28c14db7a136bf0Adam Langley MD5_DIGEST_LENGTH, /* max tag length */ 389e9ada863a7b3e81f5d2b1e3bdd2305da902a87f5Adam Langley aead_rc4_md5_tls_init, 390e9ada863a7b3e81f5d2b1e3bdd2305da902a87f5Adam Langley NULL, /* init_with_direction */ 391e9ada863a7b3e81f5d2b1e3bdd2305da902a87f5Adam Langley aead_rc4_md5_tls_cleanup, 392e9ada863a7b3e81f5d2b1e3bdd2305da902a87f5Adam Langley aead_rc4_md5_tls_seal, 393e9ada863a7b3e81f5d2b1e3bdd2305da902a87f5Adam Langley aead_rc4_md5_tls_open, 394e9ada863a7b3e81f5d2b1e3bdd2305da902a87f5Adam Langley aead_rc4_md5_tls_get_rc4_state, 395d9e397b599b13d642138480a28c14db7a136bf0Adam Langley}; 396d9e397b599b13d642138480a28c14db7a136bf0Adam Langley 397d9e397b599b13d642138480a28c14db7a136bf0Adam Langleyconst EVP_AEAD *EVP_aead_rc4_md5_tls(void) { return &aead_rc4_md5_tls; } 398