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/*
* Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/* RC4_HMAC_MD5 cipher implementation */
/*
* MD5 and RC4 low level APIs are deprecated for public use, but still ok for
* internal use.
*/
#include "internal/deprecated.h"
#include "cipher_rc4_hmac_md5.h"
#define NO_PAYLOAD_LENGTH ((size_t)-1)
#if defined(RC4_ASM) \
&& defined(MD5_ASM) \
&& (defined(__x86_64) \
|| defined(__x86_64__) \
|| defined(_M_AMD64) \
|| defined(_M_X64))
# define STITCHED_CALL
# define MOD 32 /* 32 is $MOD from rc4_md5-x86_64.pl */
#else
# define rc4_off 0
# define md5_off 0
#endif
static int cipher_hw_rc4_hmac_md5_initkey(PROV_CIPHER_CTX *bctx,
const uint8_t *key, size_t keylen)
{
PROV_RC4_HMAC_MD5_CTX *ctx = (PROV_RC4_HMAC_MD5_CTX *)bctx;
RC4_set_key(&ctx->ks.ks, keylen, key);
MD5_Init(&ctx->head); /* handy when benchmarking */
ctx->tail = ctx->head;
ctx->md = ctx->head;
ctx->payload_length = NO_PAYLOAD_LENGTH;
bctx->removetlsfixed = MD5_DIGEST_LENGTH;
return 1;
}
static int cipher_hw_rc4_hmac_md5_cipher(PROV_CIPHER_CTX *bctx,
unsigned char *out,
const unsigned char *in, size_t len)
{
PROV_RC4_HMAC_MD5_CTX *ctx = (PROV_RC4_HMAC_MD5_CTX *)bctx;
RC4_KEY *ks = &ctx->ks.ks;
#if defined(STITCHED_CALL)
size_t rc4_off = MOD - 1 - (ks->x & (MOD - 1));
size_t md5_off = MD5_CBLOCK - ctx->md.num, blocks;
unsigned int l;
#endif
size_t plen = ctx->payload_length;
if (plen != NO_PAYLOAD_LENGTH && len != (plen + MD5_DIGEST_LENGTH))
return 0;
if (ctx->base.enc) {
if (plen == NO_PAYLOAD_LENGTH)
plen = len;
#if defined(STITCHED_CALL)
/* cipher has to "fall behind" */
if (rc4_off > md5_off)
md5_off += MD5_CBLOCK;
if (plen > md5_off
&& (blocks = (plen - md5_off) / MD5_CBLOCK)
&& (OPENSSL_ia32cap_P[0] & (1 << 20)) == 0) {
MD5_Update(&ctx->md, in, md5_off);
RC4(ks, rc4_off, in, out);
rc4_md5_enc(ks, in + rc4_off, out + rc4_off,
&ctx->md, in + md5_off, blocks);
blocks *= MD5_CBLOCK;
rc4_off += blocks;
md5_off += blocks;
ctx->md.Nh += blocks >> 29;
ctx->md.Nl += blocks <<= 3;
if (ctx->md.Nl < (unsigned int)blocks)
ctx->md.Nh++;
} else {
rc4_off = 0;
md5_off = 0;
}
#endif
MD5_Update(&ctx->md, in + md5_off, plen - md5_off);
if (plen != len) { /* "TLS" mode of operation */
if (in != out)
memcpy(out + rc4_off, in + rc4_off, plen - rc4_off);
/* calculate HMAC and append it to payload */
MD5_Final(out + plen, &ctx->md);
ctx->md = ctx->tail;
MD5_Update(&ctx->md, out + plen, MD5_DIGEST_LENGTH);
MD5_Final(out + plen, &ctx->md);
/* encrypt HMAC at once */
RC4(ks, len - rc4_off, out + rc4_off, out + rc4_off);
} else {
RC4(ks, len - rc4_off, in + rc4_off, out + rc4_off);
}
} else {
unsigned char mac[MD5_DIGEST_LENGTH];
#if defined(STITCHED_CALL)
/* digest has to "fall behind" */
if (md5_off > rc4_off)
rc4_off += 2 * MD5_CBLOCK;
else
rc4_off += MD5_CBLOCK;
if (len > rc4_off
&& (blocks = (len - rc4_off) / MD5_CBLOCK)
&& (OPENSSL_ia32cap_P[0] & (1 << 20)) == 0) {
RC4(ks, rc4_off, in, out);
MD5_Update(&ctx->md, out, md5_off);
rc4_md5_enc(ks, in + rc4_off, out + rc4_off,
&ctx->md, out + md5_off, blocks);
blocks *= MD5_CBLOCK;
rc4_off += blocks;
md5_off += blocks;
l = (ctx->md.Nl + (blocks << 3)) & 0xffffffffU;
if (l < ctx->md.Nl)
ctx->md.Nh++;
ctx->md.Nl = l;
ctx->md.Nh += blocks >> 29;
} else {
md5_off = 0;
rc4_off = 0;
}
#endif
/* decrypt HMAC at once */
RC4(ks, len - rc4_off, in + rc4_off, out + rc4_off);
if (plen != NO_PAYLOAD_LENGTH) {
/* "TLS" mode of operation */
MD5_Update(&ctx->md, out + md5_off, plen - md5_off);
/* calculate HMAC and verify it */
MD5_Final(mac, &ctx->md);
ctx->md = ctx->tail;
MD5_Update(&ctx->md, mac, MD5_DIGEST_LENGTH);
MD5_Final(mac, &ctx->md);
if (CRYPTO_memcmp(out + plen, mac, MD5_DIGEST_LENGTH))
return 0;
} else {
MD5_Update(&ctx->md, out + md5_off, len - md5_off);
}
}
ctx->payload_length = NO_PAYLOAD_LENGTH;
return 1;
}
static int cipher_hw_rc4_hmac_md5_tls_init(PROV_CIPHER_CTX *bctx,
unsigned char *aad, size_t aad_len)
{
PROV_RC4_HMAC_MD5_CTX *ctx = (PROV_RC4_HMAC_MD5_CTX *)bctx;
unsigned int len;
if (aad_len != EVP_AEAD_TLS1_AAD_LEN)
return 0;
len = aad[aad_len - 2] << 8 | aad[aad_len - 1];
if (!bctx->enc) {
if (len < MD5_DIGEST_LENGTH)
return 0;
len -= MD5_DIGEST_LENGTH;
aad[aad_len - 2] = len >> 8;
aad[aad_len - 1] = len;
}
ctx->payload_length = len;
ctx->md = ctx->head;
MD5_Update(&ctx->md, aad, aad_len);
return MD5_DIGEST_LENGTH;
}
static void cipher_hw_rc4_hmac_md5_init_mackey(PROV_CIPHER_CTX *bctx,
const unsigned char *key,
size_t len)
{
PROV_RC4_HMAC_MD5_CTX *ctx = (PROV_RC4_HMAC_MD5_CTX *)bctx;
unsigned int i;
unsigned char hmac_key[64];
memset(hmac_key, 0, sizeof(hmac_key));
if (len > (int)sizeof(hmac_key)) {
MD5_Init(&ctx->head);
MD5_Update(&ctx->head, key, len);
MD5_Final(hmac_key, &ctx->head);
} else {
memcpy(hmac_key, key, len);
}
for (i = 0; i < sizeof(hmac_key); i++)
hmac_key[i] ^= 0x36; /* ipad */
MD5_Init(&ctx->head);
MD5_Update(&ctx->head, hmac_key, sizeof(hmac_key));
for (i = 0; i < sizeof(hmac_key); i++)
hmac_key[i] ^= 0x36 ^ 0x5c; /* opad */
MD5_Init(&ctx->tail);
MD5_Update(&ctx->tail, hmac_key, sizeof(hmac_key));
OPENSSL_cleanse(hmac_key, sizeof(hmac_key));
}
static const PROV_CIPHER_HW_RC4_HMAC_MD5 rc4_hmac_md5_hw = {
{
cipher_hw_rc4_hmac_md5_initkey,
cipher_hw_rc4_hmac_md5_cipher
},
cipher_hw_rc4_hmac_md5_tls_init,
cipher_hw_rc4_hmac_md5_init_mackey
};
const PROV_CIPHER_HW *ossl_prov_cipher_hw_rc4_hmac_md5(size_t keybits)
{
return (PROV_CIPHER_HW *)&rc4_hmac_md5_hw;
}
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