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262 lines
7.7 KiB
C
262 lines
7.7 KiB
C
/*
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* Copyright 2011-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <openssl/opensslconf.h>
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#include <stdio.h>
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#include <string.h>
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#if !defined(OPENSSL_NO_RC4) && !defined(OPENSSL_NO_MD5)
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# include <openssl/crypto.h>
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# include <openssl/evp.h>
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# include <openssl/objects.h>
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# include <openssl/rc4.h>
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# include <openssl/md5.h>
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# include "crypto/evp.h"
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typedef struct {
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RC4_KEY ks;
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MD5_CTX head, tail, md;
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size_t payload_length;
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} EVP_RC4_HMAC_MD5;
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# define NO_PAYLOAD_LENGTH ((size_t)-1)
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void rc4_md5_enc(RC4_KEY *key, const void *in0, void *out,
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MD5_CTX *ctx, const void *inp, size_t blocks);
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# define data(ctx) ((EVP_RC4_HMAC_MD5 *)EVP_CIPHER_CTX_get_cipher_data(ctx))
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static int rc4_hmac_md5_init_key(EVP_CIPHER_CTX *ctx,
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const unsigned char *inkey,
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const unsigned char *iv, int enc)
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{
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EVP_RC4_HMAC_MD5 *key = data(ctx);
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RC4_set_key(&key->ks, EVP_CIPHER_CTX_key_length(ctx), inkey);
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MD5_Init(&key->head); /* handy when benchmarking */
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key->tail = key->head;
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key->md = key->head;
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key->payload_length = NO_PAYLOAD_LENGTH;
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return 1;
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}
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# if defined(RC4_ASM) && defined(MD5_ASM) && ( \
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defined(__x86_64) || defined(__x86_64__) || \
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defined(_M_AMD64) || defined(_M_X64) )
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# define STITCHED_CALL
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# endif
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# if !defined(STITCHED_CALL)
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# define rc4_off 0
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# define md5_off 0
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# endif
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static int rc4_hmac_md5_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
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const unsigned char *in, size_t len)
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{
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EVP_RC4_HMAC_MD5 *key = data(ctx);
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# if defined(STITCHED_CALL)
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size_t rc4_off = 32 - 1 - (key->ks.x & (32 - 1)), /* 32 is $MOD from
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* rc4_md5-x86_64.pl */
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md5_off = MD5_CBLOCK - key->md.num, blocks;
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unsigned int l;
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extern unsigned int OPENSSL_ia32cap_P[];
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# endif
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size_t plen = key->payload_length;
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if (plen != NO_PAYLOAD_LENGTH && len != (plen + MD5_DIGEST_LENGTH))
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return 0;
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if (EVP_CIPHER_CTX_encrypting(ctx)) {
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if (plen == NO_PAYLOAD_LENGTH)
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plen = len;
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# if defined(STITCHED_CALL)
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/* cipher has to "fall behind" */
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if (rc4_off > md5_off)
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md5_off += MD5_CBLOCK;
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if (plen > md5_off && (blocks = (plen - md5_off) / MD5_CBLOCK) &&
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(OPENSSL_ia32cap_P[0] & (1 << 20)) == 0) {
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MD5_Update(&key->md, in, md5_off);
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RC4(&key->ks, rc4_off, in, out);
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rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off,
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&key->md, in + md5_off, blocks);
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blocks *= MD5_CBLOCK;
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rc4_off += blocks;
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md5_off += blocks;
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key->md.Nh += blocks >> 29;
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key->md.Nl += blocks <<= 3;
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if (key->md.Nl < (unsigned int)blocks)
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key->md.Nh++;
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} else {
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rc4_off = 0;
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md5_off = 0;
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}
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# endif
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MD5_Update(&key->md, in + md5_off, plen - md5_off);
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if (plen != len) { /* "TLS" mode of operation */
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if (in != out)
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memcpy(out + rc4_off, in + rc4_off, plen - rc4_off);
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/* calculate HMAC and append it to payload */
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MD5_Final(out + plen, &key->md);
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key->md = key->tail;
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MD5_Update(&key->md, out + plen, MD5_DIGEST_LENGTH);
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MD5_Final(out + plen, &key->md);
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/* encrypt HMAC at once */
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RC4(&key->ks, len - rc4_off, out + rc4_off, out + rc4_off);
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} else {
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RC4(&key->ks, len - rc4_off, in + rc4_off, out + rc4_off);
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}
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} else {
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unsigned char mac[MD5_DIGEST_LENGTH];
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# if defined(STITCHED_CALL)
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/* digest has to "fall behind" */
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if (md5_off > rc4_off)
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rc4_off += 2 * MD5_CBLOCK;
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else
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rc4_off += MD5_CBLOCK;
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if (len > rc4_off && (blocks = (len - rc4_off) / MD5_CBLOCK) &&
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(OPENSSL_ia32cap_P[0] & (1 << 20)) == 0) {
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RC4(&key->ks, rc4_off, in, out);
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MD5_Update(&key->md, out, md5_off);
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rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off,
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&key->md, out + md5_off, blocks);
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blocks *= MD5_CBLOCK;
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rc4_off += blocks;
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md5_off += blocks;
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l = (key->md.Nl + (blocks << 3)) & 0xffffffffU;
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if (l < key->md.Nl)
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key->md.Nh++;
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key->md.Nl = l;
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key->md.Nh += blocks >> 29;
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} else {
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md5_off = 0;
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rc4_off = 0;
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}
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# endif
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/* decrypt HMAC at once */
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RC4(&key->ks, len - rc4_off, in + rc4_off, out + rc4_off);
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if (plen != NO_PAYLOAD_LENGTH) { /* "TLS" mode of operation */
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MD5_Update(&key->md, out + md5_off, plen - md5_off);
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/* calculate HMAC and verify it */
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MD5_Final(mac, &key->md);
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key->md = key->tail;
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MD5_Update(&key->md, mac, MD5_DIGEST_LENGTH);
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MD5_Final(mac, &key->md);
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if (CRYPTO_memcmp(out + plen, mac, MD5_DIGEST_LENGTH))
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return 0;
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} else {
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MD5_Update(&key->md, out + md5_off, len - md5_off);
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}
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}
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key->payload_length = NO_PAYLOAD_LENGTH;
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return 1;
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}
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static int rc4_hmac_md5_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg,
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void *ptr)
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{
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EVP_RC4_HMAC_MD5 *key = data(ctx);
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switch (type) {
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case EVP_CTRL_AEAD_SET_MAC_KEY:
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{
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unsigned int i;
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unsigned char hmac_key[64];
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memset(hmac_key, 0, sizeof(hmac_key));
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if (arg > (int)sizeof(hmac_key)) {
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MD5_Init(&key->head);
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MD5_Update(&key->head, ptr, arg);
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MD5_Final(hmac_key, &key->head);
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} else {
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memcpy(hmac_key, ptr, arg);
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}
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for (i = 0; i < sizeof(hmac_key); i++)
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hmac_key[i] ^= 0x36; /* ipad */
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MD5_Init(&key->head);
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MD5_Update(&key->head, hmac_key, sizeof(hmac_key));
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for (i = 0; i < sizeof(hmac_key); i++)
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hmac_key[i] ^= 0x36 ^ 0x5c; /* opad */
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MD5_Init(&key->tail);
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MD5_Update(&key->tail, hmac_key, sizeof(hmac_key));
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OPENSSL_cleanse(hmac_key, sizeof(hmac_key));
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return 1;
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}
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case EVP_CTRL_AEAD_TLS1_AAD:
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{
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unsigned char *p = ptr;
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unsigned int len;
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if (arg != EVP_AEAD_TLS1_AAD_LEN)
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return -1;
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len = p[arg - 2] << 8 | p[arg - 1];
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if (!EVP_CIPHER_CTX_encrypting(ctx)) {
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if (len < MD5_DIGEST_LENGTH)
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return -1;
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len -= MD5_DIGEST_LENGTH;
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p[arg - 2] = len >> 8;
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p[arg - 1] = len;
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}
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key->payload_length = len;
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key->md = key->head;
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MD5_Update(&key->md, p, arg);
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return MD5_DIGEST_LENGTH;
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}
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default:
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return -1;
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}
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}
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static EVP_CIPHER r4_hmac_md5_cipher = {
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# ifdef NID_rc4_hmac_md5
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NID_rc4_hmac_md5,
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# else
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NID_undef,
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# endif
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1, EVP_RC4_KEY_SIZE, 0,
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EVP_CIPH_STREAM_CIPHER | EVP_CIPH_VARIABLE_LENGTH |
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EVP_CIPH_FLAG_AEAD_CIPHER,
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rc4_hmac_md5_init_key,
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rc4_hmac_md5_cipher,
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NULL,
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sizeof(EVP_RC4_HMAC_MD5),
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NULL,
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NULL,
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rc4_hmac_md5_ctrl,
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NULL
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};
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const EVP_CIPHER *EVP_rc4_hmac_md5(void)
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{
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return &r4_hmac_md5_cipher;
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}
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#endif
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