Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libcrypto/crypto/../../libssl/src/crypto/evp/e_aes_cbc_hmac_sha1.c	Lines:	4	214	1.9 %
Date:	2016-12-06	Branches:	2	71	2.8 %


/* $OpenBSD: e_aes_cbc_hmac_sha1.c,v 1.12 2016/05/04 15:01:33 tedu Exp $ */
/* ====================================================================
 * Copyright (c) 2011-2013 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    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
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 */

#include <stdio.h>
#include <string.h>

#include <openssl/opensslconf.h>

#if !defined(OPENSSL_NO_AES) && !defined(OPENSSL_NO_SHA1)

#include <openssl/evp.h>
#include <openssl/objects.h>
#include <openssl/aes.h>
#include <openssl/sha.h>
#include "evp_locl.h"
#include "constant_time_locl.h"

#ifndef EVP_CIPH_FLAG_AEAD_CIPHER
#define EVP_CIPH_FLAG_AEAD_CIPHER	0x200000
#define EVP_CTRL_AEAD_TLS1_AAD		0x16
#define EVP_CTRL_AEAD_SET_MAC_KEY	0x17
#endif

#define TLS1_1_VERSION 0x0302

typedef struct {
	AES_KEY		ks;
	SHA_CTX		head, tail, md;
	size_t		payload_length;	/* AAD length in decrypt case */
	union {
		unsigned int	tls_ver;
		unsigned char	tls_aad[16];	/* 13 used */
	} aux;
} EVP_AES_HMAC_SHA1;

#define NO_PAYLOAD_LENGTH	((size_t)-1)

#if	defined(AES_ASM) &&	( \
	defined(__x86_64)	|| defined(__x86_64__)	|| \
	defined(_M_AMD64)	|| defined(_M_X64)	|| \
	defined(__INTEL__)	)

#if defined(__GNUC__) && __GNUC__>=2
# define BSWAP(x) ({ unsigned int r=(x); asm ("bswapl %0":"=r"(r):"0"(r)); r; })
#endif

extern unsigned int OPENSSL_ia32cap_P[2];
#define AESNI_CAPABLE   (1<<(57-32))

int aesni_set_encrypt_key(const unsigned char *userKey, int bits, AES_KEY *key);
int aesni_set_decrypt_key(const unsigned char *userKey, int bits, AES_KEY *key);

void aesni_cbc_encrypt(const unsigned char *in, unsigned char *out,
    size_t length, const AES_KEY *key, unsigned char *ivec, int enc);

void aesni_cbc_sha1_enc (const void *inp, void *out, size_t blocks,
    const AES_KEY *key, unsigned char iv[16], SHA_CTX *ctx, const void *in0);

#define data(ctx) ((EVP_AES_HMAC_SHA1 *)(ctx)->cipher_data)

static int
aesni_cbc_hmac_sha1_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *inkey,
    const unsigned char *iv, int enc)
{
	EVP_AES_HMAC_SHA1 *key = data(ctx);
	int ret;

	if (enc)
		ret = aesni_set_encrypt_key(inkey, ctx->key_len * 8, &key->ks);
	else
		ret = aesni_set_decrypt_key(inkey, ctx->key_len * 8, &key->ks);

	SHA1_Init(&key->head);	/* handy when benchmarking */
	key->tail = key->head;
	key->md = key->head;

	key->payload_length = NO_PAYLOAD_LENGTH;

	return ret < 0 ? 0 : 1;
}

#define	STITCHED_CALL

#if !defined(STITCHED_CALL)
#define	aes_off 0
#endif

void sha1_block_data_order (void *c, const void *p, size_t len);

static void
sha1_update(SHA_CTX *c, const void *data, size_t len)
{
	const unsigned char *ptr = data;
	size_t res;

	if ((res = c->num)) {
		res = SHA_CBLOCK - res;
		if (len < res)
			res = len;
		SHA1_Update(c, ptr, res);
		ptr += res;
		len -= res;
	}

	res = len % SHA_CBLOCK;
	len -= res;

	if (len) {
		sha1_block_data_order(c, ptr, len / SHA_CBLOCK);

		ptr += len;
		c->Nh += len >> 29;
		c->Nl += len <<= 3;
		if (c->Nl < (unsigned int)len)
			c->Nh++;
	}

	if (res)
		SHA1_Update(c, ptr, res);
}

#ifdef SHA1_Update
#undef SHA1_Update
#endif
#define SHA1_Update sha1_update

static int
aesni_cbc_hmac_sha1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t len)
{
	EVP_AES_HMAC_SHA1 *key = data(ctx);
	unsigned int l;
	size_t plen = key->payload_length,
	    iv = 0,		/* explicit IV in TLS 1.1 and later */
	    sha_off = 0;
#if defined(STITCHED_CALL)
	size_t aes_off = 0, blocks;

	sha_off = SHA_CBLOCK - key->md.num;
#endif

	key->payload_length = NO_PAYLOAD_LENGTH;

	if (len % AES_BLOCK_SIZE)
		return 0;

	if (ctx->encrypt) {
		if (plen == NO_PAYLOAD_LENGTH)
			plen = len;
		else if (len != ((plen + SHA_DIGEST_LENGTH + AES_BLOCK_SIZE) &
		    -AES_BLOCK_SIZE))
			return 0;
		else if (key->aux.tls_ver >= TLS1_1_VERSION)
			iv = AES_BLOCK_SIZE;

#if defined(STITCHED_CALL)
		if (plen > (sha_off + iv) &&
		    (blocks = (plen - (sha_off + iv)) / SHA_CBLOCK)) {
			SHA1_Update(&key->md, in + iv, sha_off);

			aesni_cbc_sha1_enc(in, out, blocks, &key->ks,
			    ctx->iv, &key->md, in + iv + sha_off);
			blocks *= SHA_CBLOCK;
			aes_off += blocks;
			sha_off += blocks;
			key->md.Nh += blocks >> 29;
			key->md.Nl += blocks <<= 3;
			if (key->md.Nl < (unsigned int)blocks)
				key->md.Nh++;
		} else {
			sha_off = 0;
		}
#endif
		sha_off += iv;
		SHA1_Update(&key->md, in + sha_off, plen - sha_off);

		if (plen != len) {	/* "TLS" mode of operation */
			if (in != out)
				memcpy(out + aes_off, in + aes_off,
				    plen - aes_off);

			/* calculate HMAC and append it to payload */
			SHA1_Final(out + plen, &key->md);
			key->md = key->tail;
			SHA1_Update(&key->md, out + plen, SHA_DIGEST_LENGTH);
			SHA1_Final(out + plen, &key->md);

			/* pad the payload|hmac */
			plen += SHA_DIGEST_LENGTH;
			for (l = len - plen - 1; plen < len; plen++)
				out[plen] = l;

			/* encrypt HMAC|padding at once */
			aesni_cbc_encrypt(out + aes_off, out + aes_off,
			    len - aes_off, &key->ks, ctx->iv, 1);
		} else {
			aesni_cbc_encrypt(in + aes_off, out + aes_off,
			    len - aes_off, &key->ks, ctx->iv, 1);
		}
	} else {
		union {
			unsigned int u[SHA_DIGEST_LENGTH/sizeof(unsigned int)];
			unsigned char c[32 + SHA_DIGEST_LENGTH];
		} mac, *pmac;

		/* arrange cache line alignment */
		pmac = (void *)(((size_t)mac.c + 31) & ((size_t)0 - 32));

		/* decrypt HMAC|padding at once */
		aesni_cbc_encrypt(in, out, len, &key->ks, ctx->iv, 0);

		if (plen) {	/* "TLS" mode of operation */
			size_t inp_len, mask, j, i;
			unsigned int res, maxpad, pad, bitlen;
			int ret = 1;
			union {
				unsigned int u[SHA_LBLOCK];
				unsigned char c[SHA_CBLOCK];
			}
			*data = (void *)key->md.data;

			if ((key->aux.tls_aad[plen - 4] << 8 |
			    key->aux.tls_aad[plen - 3]) >= TLS1_1_VERSION)
				iv = AES_BLOCK_SIZE;

			if (len < (iv + SHA_DIGEST_LENGTH + 1))
				return 0;

			/* omit explicit iv */
			out += iv;
			len -= iv;

			/* figure out payload length */
			pad = out[len - 1];
			maxpad = len - (SHA_DIGEST_LENGTH + 1);
			maxpad |= (255 - maxpad) >> (sizeof(maxpad) * 8 - 8);
			maxpad &= 255;

			ret &= constant_time_ge(maxpad, pad);

			inp_len = len - (SHA_DIGEST_LENGTH + pad + 1);
			mask = (0 - ((inp_len - len) >>
			    (sizeof(inp_len) * 8 - 1)));
			inp_len &= mask;
			ret &= (int)mask;

			key->aux.tls_aad[plen - 2] = inp_len >> 8;
			key->aux.tls_aad[plen - 1] = inp_len;

			/* calculate HMAC */
			key->md = key->head;
			SHA1_Update(&key->md, key->aux.tls_aad, plen);

#if 1
			len -= SHA_DIGEST_LENGTH;		/* amend mac */
			if (len >= (256 + SHA_CBLOCK)) {
				j = (len - (256 + SHA_CBLOCK)) &
				    (0 - SHA_CBLOCK);
				j += SHA_CBLOCK - key->md.num;
				SHA1_Update(&key->md, out, j);
				out += j;
				len -= j;
				inp_len -= j;
			}

			/* but pretend as if we hashed padded payload */
			bitlen = key->md.Nl + (inp_len << 3);	/* at most 18 bits */
#ifdef BSWAP
			bitlen = BSWAP(bitlen);
#else
			mac.c[0] = 0;
			mac.c[1] = (unsigned char)(bitlen >> 16);
			mac.c[2] = (unsigned char)(bitlen >> 8);
			mac.c[3] = (unsigned char)bitlen;
			bitlen = mac.u[0];
#endif

			pmac->u[0] = 0;
			pmac->u[1] = 0;
			pmac->u[2] = 0;
			pmac->u[3] = 0;
			pmac->u[4] = 0;

			for (res = key->md.num, j = 0; j < len; j++) {
				size_t c = out[j];
				mask = (j - inp_len) >> (sizeof(j) * 8 - 8);
				c &= mask;
				c |= 0x80 & ~mask &
				    ~((inp_len - j) >> (sizeof(j) * 8 - 8));
				data->c[res++] = (unsigned char)c;

				if (res != SHA_CBLOCK)
					continue;

				/* j is not incremented yet */
				mask = 0 - ((inp_len + 7 - j) >>
				    (sizeof(j) * 8 - 1));
				data->u[SHA_LBLOCK - 1] |= bitlen&mask;
				sha1_block_data_order(&key->md, data, 1);
				mask &= 0 - ((j - inp_len - 72) >>
				    (sizeof(j) * 8 - 1));
				pmac->u[0] |= key->md.h0 & mask;
				pmac->u[1] |= key->md.h1 & mask;
				pmac->u[2] |= key->md.h2 & mask;
				pmac->u[3] |= key->md.h3 & mask;
				pmac->u[4] |= key->md.h4 & mask;
				res = 0;
			}

			for (i = res; i < SHA_CBLOCK; i++, j++)
				data->c[i] = 0;

			if (res > SHA_CBLOCK - 8) {
				mask = 0 - ((inp_len + 8 - j) >>
				    (sizeof(j) * 8 - 1));
				data->u[SHA_LBLOCK - 1] |= bitlen & mask;
				sha1_block_data_order(&key->md, data, 1);
				mask &= 0 - ((j - inp_len - 73) >>
				    (sizeof(j) * 8 - 1));
				pmac->u[0] |= key->md.h0 & mask;
				pmac->u[1] |= key->md.h1 & mask;
				pmac->u[2] |= key->md.h2 & mask;
				pmac->u[3] |= key->md.h3 & mask;
				pmac->u[4] |= key->md.h4 & mask;

				memset(data, 0, SHA_CBLOCK);
				j += 64;
			}
			data->u[SHA_LBLOCK - 1] = bitlen;
			sha1_block_data_order(&key->md, data, 1);
			mask = 0 - ((j - inp_len - 73) >> (sizeof(j) * 8 - 1));
			pmac->u[0] |= key->md.h0 & mask;
			pmac->u[1] |= key->md.h1 & mask;
			pmac->u[2] |= key->md.h2 & mask;
			pmac->u[3] |= key->md.h3 & mask;
			pmac->u[4] |= key->md.h4 & mask;

#ifdef BSWAP
			pmac->u[0] = BSWAP(pmac->u[0]);
			pmac->u[1] = BSWAP(pmac->u[1]);
			pmac->u[2] = BSWAP(pmac->u[2]);
			pmac->u[3] = BSWAP(pmac->u[3]);
			pmac->u[4] = BSWAP(pmac->u[4]);
#else
			for (i = 0; i < 5; i++) {
				res = pmac->u[i];
				pmac->c[4 * i + 0] = (unsigned char)(res >> 24);
				pmac->c[4 * i + 1] = (unsigned char)(res >> 16);
				pmac->c[4 * i + 2] = (unsigned char)(res >> 8);
				pmac->c[4 * i + 3] = (unsigned char)res;
			}
#endif
			len += SHA_DIGEST_LENGTH;
#else
			SHA1_Update(&key->md, out, inp_len);
			res = key->md.num;
			SHA1_Final(pmac->c, &key->md);

			{
				unsigned int inp_blocks, pad_blocks;

				/* but pretend as if we hashed padded payload */
				inp_blocks = 1 + ((SHA_CBLOCK - 9 - res) >>
				    (sizeof(res) * 8 - 1));
				res += (unsigned int)(len - inp_len);
				pad_blocks = res / SHA_CBLOCK;
				res %= SHA_CBLOCK;
				pad_blocks += 1 + ((SHA_CBLOCK - 9 - res) >>
				    (sizeof(res) * 8 - 1));
				for (; inp_blocks < pad_blocks; inp_blocks++)
					sha1_block_data_order(&key->md,
					    data, 1);
			}
#endif
			key->md = key->tail;
			SHA1_Update(&key->md, pmac->c, SHA_DIGEST_LENGTH);
			SHA1_Final(pmac->c, &key->md);

			/* verify HMAC */
			out += inp_len;
			len -= inp_len;
#if 1
			{
				unsigned char *p =
				    out + len - 1 - maxpad - SHA_DIGEST_LENGTH;
				size_t off = out - p;
				unsigned int c, cmask;

				maxpad += SHA_DIGEST_LENGTH;
				for (res = 0, i = 0, j = 0; j < maxpad; j++) {
					c = p[j];
					cmask = ((int)(j - off -
					    SHA_DIGEST_LENGTH)) >>
					    (sizeof(int) * 8 - 1);
					res |= (c ^ pad) & ~cmask;	/* ... and padding */
					cmask &= ((int)(off - 1 - j)) >>
					    (sizeof(int) * 8 - 1);
					res |= (c ^ pmac->c[i]) & cmask;
					i += 1 & cmask;
				}
				maxpad -= SHA_DIGEST_LENGTH;

				res = 0 - ((0 - res) >> (sizeof(res) * 8 - 1));
				ret &= (int)~res;
			}
#else
			for (res = 0, i = 0; i < SHA_DIGEST_LENGTH; i++)
				res |= out[i] ^ pmac->c[i];
			res = 0 - ((0 - res) >> (sizeof(res) * 8 - 1));
			ret &= (int)~res;

			/* verify padding */
			pad = (pad & ~res) | (maxpad & res);
			out = out + len - 1 - pad;
			for (res = 0, i = 0; i < pad; i++)
				res |= out[i] ^ pad;

			res = (0 - res) >> (sizeof(res) * 8 - 1);
			ret &= (int)~res;
#endif
			return ret;
		} else {
			SHA1_Update(&key->md, out, len);
		}
	}

	return 1;
}

static int
aesni_cbc_hmac_sha1_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
{
	EVP_AES_HMAC_SHA1 *key = data(ctx);

	switch (type) {
	case EVP_CTRL_AEAD_SET_MAC_KEY:
		{
			unsigned int  i;
			unsigned char hmac_key[64];

			memset(hmac_key, 0, sizeof(hmac_key));

			if (arg > (int)sizeof(hmac_key)) {
				SHA1_Init(&key->head);
				SHA1_Update(&key->head, ptr, arg);
				SHA1_Final(hmac_key, &key->head);
			} else {
				memcpy(hmac_key, ptr, arg);
			}

			for (i = 0; i < sizeof(hmac_key); i++)
				hmac_key[i] ^= 0x36;		/* ipad */
			SHA1_Init(&key->head);
			SHA1_Update(&key->head, hmac_key, sizeof(hmac_key));

			for (i = 0; i < sizeof(hmac_key); i++)
				hmac_key[i] ^= 0x36 ^ 0x5c;	/* opad */
			SHA1_Init(&key->tail);
			SHA1_Update(&key->tail, hmac_key, sizeof(hmac_key));

			explicit_bzero(hmac_key, sizeof(hmac_key));

			return 1;
		}
	case EVP_CTRL_AEAD_TLS1_AAD:
		{
			unsigned char *p = ptr;
			unsigned int len = p[arg - 2] << 8 | p[arg - 1];

			if (ctx->encrypt) {
				key->payload_length = len;
				if ((key->aux.tls_ver = p[arg - 4] << 8 |
				    p[arg - 3]) >= TLS1_1_VERSION) {
					len -= AES_BLOCK_SIZE;
					p[arg - 2] = len >> 8;
					p[arg - 1] = len;
				}
				key->md = key->head;
				SHA1_Update(&key->md, p, arg);

				return (int)(((len + SHA_DIGEST_LENGTH +
				    AES_BLOCK_SIZE) & -AES_BLOCK_SIZE) - len);
			} else {
				if (arg > 13)
					arg = 13;
				memcpy(key->aux.tls_aad, ptr, arg);
				key->payload_length = arg;

				return SHA_DIGEST_LENGTH;
			}
		}
	default:
		return -1;
	}
}

static EVP_CIPHER aesni_128_cbc_hmac_sha1_cipher = {
#ifdef NID_aes_128_cbc_hmac_sha1
	.nid = NID_aes_128_cbc_hmac_sha1,
#else
	.nid = NID_undef,
#endif
	.block_size = 16,
	.key_len = 16,
	.iv_len = 16,
	.flags = EVP_CIPH_CBC_MODE | EVP_CIPH_FLAG_DEFAULT_ASN1 |
	    EVP_CIPH_FLAG_AEAD_CIPHER,
	.init = aesni_cbc_hmac_sha1_init_key,
	.do_cipher = aesni_cbc_hmac_sha1_cipher,
	.ctx_size = sizeof(EVP_AES_HMAC_SHA1),
	.ctrl = aesni_cbc_hmac_sha1_ctrl
};

static EVP_CIPHER aesni_256_cbc_hmac_sha1_cipher = {
#ifdef NID_aes_256_cbc_hmac_sha1
	.nid = NID_aes_256_cbc_hmac_sha1,
#else
	.nid = NID_undef,
#endif
	.block_size = 16,
	.key_len = 32,
	.iv_len = 16,
	.flags = EVP_CIPH_CBC_MODE | EVP_CIPH_FLAG_DEFAULT_ASN1 |
	    EVP_CIPH_FLAG_AEAD_CIPHER,
	.init = aesni_cbc_hmac_sha1_init_key,
	.do_cipher = aesni_cbc_hmac_sha1_cipher,
	.ctx_size = sizeof(EVP_AES_HMAC_SHA1),
	.ctrl = aesni_cbc_hmac_sha1_ctrl
};

const EVP_CIPHER *
EVP_aes_128_cbc_hmac_sha1(void)
{
	return OPENSSL_ia32cap_P[1] & AESNI_CAPABLE ?
	    &aesni_128_cbc_hmac_sha1_cipher : NULL;
}

const EVP_CIPHER *
EVP_aes_256_cbc_hmac_sha1(void)
{
	return OPENSSL_ia32cap_P[1] & AESNI_CAPABLE ?
	    &aesni_256_cbc_hmac_sha1_cipher : NULL;
}
#else
const EVP_CIPHER *
EVP_aes_128_cbc_hmac_sha1(void)
{
	return NULL;
}

const EVP_CIPHER *
EVP_aes_256_cbc_hmac_sha1(void)
{
	    return NULL;
}
#endif
#endif


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: e_aes_cbc_hmac_sha1.c,v 1.12 2016/05/04 15:01:33 tedu Exp $ */
2			/* ====================================================================
3			* Copyright (c) 2011-2013 The OpenSSL Project. All rights reserved.
4			*
5			* Redistribution and use in source and binary forms, with or without
6			* modification, are permitted provided that the following conditions
7			* are met:
8			*
9			* 1. Redistributions of source code must retain the above copyright
10			* notice, this list of conditions and the following disclaimer.
11			*
12			* 2. Redistributions in binary form must reproduce the above copyright
13			* notice, this list of conditions and the following disclaimer in
14			* the documentation and/or other materials provided with the
15			* distribution.
16			*
17			* 3. All advertising materials mentioning features or use of this
18			* software must display the following acknowledgment:
19			* "This product includes software developed by the OpenSSL Project
20			* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
21			*
22			* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
23			* endorse or promote products derived from this software without
24			* prior written permission. For written permission, please contact
25			* licensing@OpenSSL.org.
26			*
27			* 5. Products derived from this software may not be called "OpenSSL"
28			* nor may "OpenSSL" appear in their names without prior written
29			* permission of the OpenSSL Project.
30			*
31			* 6. Redistributions of any form whatsoever must retain the following
32			* acknowledgment:
33			* "This product includes software developed by the OpenSSL Project
34			* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
35			*
36			* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
37			* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
39			* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
40			* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41			* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
42			* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
43			* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
45			* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
46			* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
47			* OF THE POSSIBILITY OF SUCH DAMAGE.
48			* ====================================================================
49			*/
50
51			#include <stdio.h>
52			#include <string.h>
53
54			#include <openssl/opensslconf.h>
55
56			#if !defined(OPENSSL_NO_AES) && !defined(OPENSSL_NO_SHA1)
57
58			#include <openssl/evp.h>
59			#include <openssl/objects.h>
60			#include <openssl/aes.h>
61			#include <openssl/sha.h>
62			#include "evp_locl.h"
63			#include "constant_time_locl.h"
64
65			#ifndef EVP_CIPH_FLAG_AEAD_CIPHER
66			#define EVP_CIPH_FLAG_AEAD_CIPHER 0x200000
67			#define EVP_CTRL_AEAD_TLS1_AAD 0x16
68			#define EVP_CTRL_AEAD_SET_MAC_KEY 0x17
69			#endif
70
71			#define TLS1_1_VERSION 0x0302
72
73			typedef struct {
74			AES_KEY ks;
75			SHA_CTX head, tail, md;
76			size_t payload_length; /* AAD length in decrypt case */
77			union {
78			unsigned int tls_ver;
79			unsigned char tls_aad[16]; /* 13 used */
80			} aux;
81			} EVP_AES_HMAC_SHA1;
82
83			#define NO_PAYLOAD_LENGTH ((size_t)-1)
84
85			#if defined(AES_ASM) && ( \
86			defined(__x86_64) \|\| defined(__x86_64__) \|\| \
87			defined(_M_AMD64) \|\| defined(_M_X64) \|\| \
88			defined(__INTEL__) )
89
90			#if defined(__GNUC__) && __GNUC__>=2
91			# define BSWAP(x) ({ unsigned int r=(x); asm ("bswapl %0":"=r"(r):"0"(r)); r; })
92			#endif
93
94			extern unsigned int OPENSSL_ia32cap_P[2];
95			#define AESNI_CAPABLE (1<<(57-32))
96
97			int aesni_set_encrypt_key(const unsigned char userKey, int bits, AES_KEY key);
98			int aesni_set_decrypt_key(const unsigned char userKey, int bits, AES_KEY key);
99
100			void aesni_cbc_encrypt(const unsigned char in, unsigned char out,
101			size_t length, const AES_KEY key, unsigned char ivec, int enc);
102
103			void aesni_cbc_sha1_enc (const void inp, void out, size_t blocks,
104			const AES_KEY key, unsigned char iv[16], SHA_CTX ctx, const void *in0);
105
106			#define data(ctx) ((EVP_AES_HMAC_SHA1 *)(ctx)->cipher_data)
107
108			static int
109			aesni_cbc_hmac_sha1_init_key(EVP_CIPHER_CTX ctx, const unsigned char inkey,
110			const unsigned char *iv, int enc)
111			{
112			EVP_AES_HMAC_SHA1 *key = data(ctx);
113			int ret;
114
115			if (enc)
116			ret = aesni_set_encrypt_key(inkey, ctx->key_len * 8, &key->ks);
117			else
118			ret = aesni_set_decrypt_key(inkey, ctx->key_len * 8, &key->ks);
119
120			SHA1_Init(&key->head); /* handy when benchmarking */
121			key->tail = key->head;
122			key->md = key->head;
123
124			key->payload_length = NO_PAYLOAD_LENGTH;
125
126			return ret < 0 ? 0 : 1;
127			}
128
129			#define STITCHED_CALL
130
131			#if !defined(STITCHED_CALL)
132			#define aes_off 0
133			#endif
134
135			void sha1_block_data_order (void c, const void p, size_t len);
136
137			static void
138			sha1_update(SHA_CTX c, const void data, size_t len)
139			{
140			const unsigned char *ptr = data;
141			size_t res;
142
143			if ((res = c->num)) {
144			res = SHA_CBLOCK - res;
145			if (len < res)
146			res = len;
147			SHA1_Update(c, ptr, res);
148			ptr += res;
149			len -= res;
150			}
151
152			res = len % SHA_CBLOCK;
153			len -= res;
154
155			if (len) {
156			sha1_block_data_order(c, ptr, len / SHA_CBLOCK);
157
158			ptr += len;
159			c->Nh += len >> 29;
160			c->Nl += len <<= 3;
161			if (c->Nl < (unsigned int)len)
162			c->Nh++;
163			}
164
165			if (res)
166			SHA1_Update(c, ptr, res);
167			}
168
169			#ifdef SHA1_Update
170			#undef SHA1_Update
171			#endif
172			#define SHA1_Update sha1_update
173
174			static int
175			aesni_cbc_hmac_sha1_cipher(EVP_CIPHER_CTX ctx, unsigned char out,
176			const unsigned char *in, size_t len)
177			{
178			EVP_AES_HMAC_SHA1 *key = data(ctx);
179			unsigned int l;
180			size_t plen = key->payload_length,
181			iv = 0, /* explicit IV in TLS 1.1 and later */
182			sha_off = 0;
183			#if defined(STITCHED_CALL)
184			size_t aes_off = 0, blocks;
185
186			sha_off = SHA_CBLOCK - key->md.num;
187			#endif
188
189			key->payload_length = NO_PAYLOAD_LENGTH;
190
191			if (len % AES_BLOCK_SIZE)
192			return 0;
193
194			if (ctx->encrypt) {
195			if (plen == NO_PAYLOAD_LENGTH)
196			plen = len;
197			else if (len != ((plen + SHA_DIGEST_LENGTH + AES_BLOCK_SIZE) &
198			-AES_BLOCK_SIZE))
199			return 0;
200			else if (key->aux.tls_ver >= TLS1_1_VERSION)
201			iv = AES_BLOCK_SIZE;
202
203			#if defined(STITCHED_CALL)
204			if (plen > (sha_off + iv) &&
205			(blocks = (plen - (sha_off + iv)) / SHA_CBLOCK)) {
206			SHA1_Update(&key->md, in + iv, sha_off);
207
208			aesni_cbc_sha1_enc(in, out, blocks, &key->ks,
209			ctx->iv, &key->md, in + iv + sha_off);
210			blocks *= SHA_CBLOCK;
211			aes_off += blocks;
212			sha_off += blocks;
213			key->md.Nh += blocks >> 29;
214			key->md.Nl += blocks <<= 3;
215			if (key->md.Nl < (unsigned int)blocks)
216			key->md.Nh++;
217			} else {
218			sha_off = 0;
219			}
220			#endif
221			sha_off += iv;
222			SHA1_Update(&key->md, in + sha_off, plen - sha_off);
223
224			if (plen != len) { /* "TLS" mode of operation */
225			if (in != out)
226			memcpy(out + aes_off, in + aes_off,
227			plen - aes_off);
228
229			/* calculate HMAC and append it to payload */
230			SHA1_Final(out + plen, &key->md);
231			key->md = key->tail;
232			SHA1_Update(&key->md, out + plen, SHA_DIGEST_LENGTH);
233			SHA1_Final(out + plen, &key->md);
234
235			/* pad the payload\|hmac */
236			plen += SHA_DIGEST_LENGTH;
237			for (l = len - plen - 1; plen < len; plen++)
238			out[plen] = l;
239
240			/* encrypt HMAC\|padding at once */
241			aesni_cbc_encrypt(out + aes_off, out + aes_off,
242			len - aes_off, &key->ks, ctx->iv, 1);
243			} else {
244			aesni_cbc_encrypt(in + aes_off, out + aes_off,
245			len - aes_off, &key->ks, ctx->iv, 1);
246			}
247			} else {
248			union {
249			unsigned int u[SHA_DIGEST_LENGTH/sizeof(unsigned int)];
250			unsigned char c[32 + SHA_DIGEST_LENGTH];
251			} mac, *pmac;
252
253			/* arrange cache line alignment */
254			pmac = (void *)(((size_t)mac.c + 31) & ((size_t)0 - 32));
255
256			/* decrypt HMAC\|padding at once */
257			aesni_cbc_encrypt(in, out, len, &key->ks, ctx->iv, 0);
258
259			if (plen) { /* "TLS" mode of operation */
260			size_t inp_len, mask, j, i;
261			unsigned int res, maxpad, pad, bitlen;
262			int ret = 1;
263			union {
264			unsigned int u[SHA_LBLOCK];
265			unsigned char c[SHA_CBLOCK];
266			}
267			data = (void )key->md.data;
268
269			if ((key->aux.tls_aad[plen - 4] << 8 \|
270			key->aux.tls_aad[plen - 3]) >= TLS1_1_VERSION)
271			iv = AES_BLOCK_SIZE;
272
273			if (len < (iv + SHA_DIGEST_LENGTH + 1))
274			return 0;
275
276			/* omit explicit iv */
277			out += iv;
278			len -= iv;
279
280			/* figure out payload length */
281			pad = out[len - 1];
282			maxpad = len - (SHA_DIGEST_LENGTH + 1);
283			maxpad \|= (255 - maxpad) >> (sizeof(maxpad) * 8 - 8);
284			maxpad &= 255;
285
286			ret &= constant_time_ge(maxpad, pad);
287
288			inp_len = len - (SHA_DIGEST_LENGTH + pad + 1);
289			mask = (0 - ((inp_len - len) >>
290			(sizeof(inp_len) * 8 - 1)));
291			inp_len &= mask;
292			ret &= (int)mask;
293
294			key->aux.tls_aad[plen - 2] = inp_len >> 8;
295			key->aux.tls_aad[plen - 1] = inp_len;
296
297			/* calculate HMAC */
298			key->md = key->head;
299			SHA1_Update(&key->md, key->aux.tls_aad, plen);
300
301			#if 1
302			len -= SHA_DIGEST_LENGTH; /* amend mac */
303			if (len >= (256 + SHA_CBLOCK)) {
304			j = (len - (256 + SHA_CBLOCK)) &
305			(0 - SHA_CBLOCK);
306			j += SHA_CBLOCK - key->md.num;
307			SHA1_Update(&key->md, out, j);
308			out += j;
309			len -= j;
310			inp_len -= j;
311			}
312
313			/* but pretend as if we hashed padded payload */
314			bitlen = key->md.Nl + (inp_len << 3); /* at most 18 bits */
315			#ifdef BSWAP
316			bitlen = BSWAP(bitlen);
317			#else
318			mac.c[0] = 0;
319			mac.c[1] = (unsigned char)(bitlen >> 16);
320			mac.c[2] = (unsigned char)(bitlen >> 8);
321			mac.c[3] = (unsigned char)bitlen;
322			bitlen = mac.u[0];
323			#endif
324
325			pmac->u[0] = 0;
326			pmac->u[1] = 0;
327			pmac->u[2] = 0;
328			pmac->u[3] = 0;
329			pmac->u[4] = 0;
330
331			for (res = key->md.num, j = 0; j < len; j++) {
332			size_t c = out[j];
333			mask = (j - inp_len) >> (sizeof(j) * 8 - 8);
334			c &= mask;
335			c \|= 0x80 & ~mask &
336			~((inp_len - j) >> (sizeof(j) * 8 - 8));
337			data->c[res++] = (unsigned char)c;
338
339			if (res != SHA_CBLOCK)
340			continue;
341
342			/* j is not incremented yet */
343			mask = 0 - ((inp_len + 7 - j) >>
344			(sizeof(j) * 8 - 1));
345			data->u[SHA_LBLOCK - 1] \|= bitlen&mask;
346			sha1_block_data_order(&key->md, data, 1);
347			mask &= 0 - ((j - inp_len - 72) >>
348			(sizeof(j) * 8 - 1));
349			pmac->u[0] \|= key->md.h0 & mask;
350			pmac->u[1] \|= key->md.h1 & mask;
351			pmac->u[2] \|= key->md.h2 & mask;
352			pmac->u[3] \|= key->md.h3 & mask;
353			pmac->u[4] \|= key->md.h4 & mask;
354			res = 0;
355			}
356
357			for (i = res; i < SHA_CBLOCK; i++, j++)
358			data->c[i] = 0;
359
360			if (res > SHA_CBLOCK - 8) {
361			mask = 0 - ((inp_len + 8 - j) >>
362			(sizeof(j) * 8 - 1));
363			data->u[SHA_LBLOCK - 1] \|= bitlen & mask;
364			sha1_block_data_order(&key->md, data, 1);
365			mask &= 0 - ((j - inp_len - 73) >>
366			(sizeof(j) * 8 - 1));
367			pmac->u[0] \|= key->md.h0 & mask;
368			pmac->u[1] \|= key->md.h1 & mask;
369			pmac->u[2] \|= key->md.h2 & mask;
370			pmac->u[3] \|= key->md.h3 & mask;
371			pmac->u[4] \|= key->md.h4 & mask;
372
373			memset(data, 0, SHA_CBLOCK);
374			j += 64;
375			}
376			data->u[SHA_LBLOCK - 1] = bitlen;
377			sha1_block_data_order(&key->md, data, 1);
378			mask = 0 - ((j - inp_len - 73) >> (sizeof(j) * 8 - 1));
379			pmac->u[0] \|= key->md.h0 & mask;
380			pmac->u[1] \|= key->md.h1 & mask;
381			pmac->u[2] \|= key->md.h2 & mask;
382			pmac->u[3] \|= key->md.h3 & mask;
383			pmac->u[4] \|= key->md.h4 & mask;
384
385			#ifdef BSWAP
386			pmac->u[0] = BSWAP(pmac->u[0]);
387			pmac->u[1] = BSWAP(pmac->u[1]);
388			pmac->u[2] = BSWAP(pmac->u[2]);
389			pmac->u[3] = BSWAP(pmac->u[3]);
390			pmac->u[4] = BSWAP(pmac->u[4]);
391			#else
392			for (i = 0; i < 5; i++) {
393			res = pmac->u[i];
394			pmac->c[4 * i + 0] = (unsigned char)(res >> 24);
395			pmac->c[4 * i + 1] = (unsigned char)(res >> 16);
396			pmac->c[4 * i + 2] = (unsigned char)(res >> 8);
397			pmac->c[4 * i + 3] = (unsigned char)res;
398			}
399			#endif
400			len += SHA_DIGEST_LENGTH;
401			#else
402			SHA1_Update(&key->md, out, inp_len);
403			res = key->md.num;
404			SHA1_Final(pmac->c, &key->md);
405
406			{
407			unsigned int inp_blocks, pad_blocks;
408
409			/* but pretend as if we hashed padded payload */
410			inp_blocks = 1 + ((SHA_CBLOCK - 9 - res) >>
411			(sizeof(res) * 8 - 1));
412			res += (unsigned int)(len - inp_len);
413			pad_blocks = res / SHA_CBLOCK;
414			res %= SHA_CBLOCK;
415			pad_blocks += 1 + ((SHA_CBLOCK - 9 - res) >>
416			(sizeof(res) * 8 - 1));
417			for (; inp_blocks < pad_blocks; inp_blocks++)
418			sha1_block_data_order(&key->md,
419			data, 1);
420			}
421			#endif
422			key->md = key->tail;
423			SHA1_Update(&key->md, pmac->c, SHA_DIGEST_LENGTH);
424			SHA1_Final(pmac->c, &key->md);
425
426			/* verify HMAC */
427			out += inp_len;
428			len -= inp_len;
429			#if 1
430			{
431			unsigned char *p =
432			out + len - 1 - maxpad - SHA_DIGEST_LENGTH;
433			size_t off = out - p;
434			unsigned int c, cmask;
435
436			maxpad += SHA_DIGEST_LENGTH;
437			for (res = 0, i = 0, j = 0; j < maxpad; j++) {
438			c = p[j];
439			cmask = ((int)(j - off -
440			SHA_DIGEST_LENGTH)) >>
441			(sizeof(int) * 8 - 1);
442			res \|= (c ^ pad) & ~cmask; /* ... and padding */
443			cmask &= ((int)(off - 1 - j)) >>
444			(sizeof(int) * 8 - 1);
445			res \|= (c ^ pmac->c[i]) & cmask;
446			i += 1 & cmask;
447			}
448			maxpad -= SHA_DIGEST_LENGTH;
449
450			res = 0 - ((0 - res) >> (sizeof(res) * 8 - 1));
451			ret &= (int)~res;
452			}
453			#else
454			for (res = 0, i = 0; i < SHA_DIGEST_LENGTH; i++)
455			res \|= out[i] ^ pmac->c[i];
456			res = 0 - ((0 - res) >> (sizeof(res) * 8 - 1));
457			ret &= (int)~res;
458
459			/* verify padding */
460			pad = (pad & ~res) \| (maxpad & res);
461			out = out + len - 1 - pad;
462			for (res = 0, i = 0; i < pad; i++)
463			res \|= out[i] ^ pad;
464
465			res = (0 - res) >> (sizeof(res) * 8 - 1);
466			ret &= (int)~res;
467			#endif
468			return ret;
469			} else {
470			SHA1_Update(&key->md, out, len);
471			}
472			}
473
474			return 1;
475			}
476
477			static int
478			aesni_cbc_hmac_sha1_ctrl(EVP_CIPHER_CTX ctx, int type, int arg, void ptr)
479			{
480			EVP_AES_HMAC_SHA1 *key = data(ctx);
481
482			switch (type) {
483			case EVP_CTRL_AEAD_SET_MAC_KEY:
484			{
485			unsigned int i;
486			unsigned char hmac_key[64];
487
488			memset(hmac_key, 0, sizeof(hmac_key));
489
490			if (arg > (int)sizeof(hmac_key)) {
491			SHA1_Init(&key->head);
492			SHA1_Update(&key->head, ptr, arg);
493			SHA1_Final(hmac_key, &key->head);
494			} else {
495			memcpy(hmac_key, ptr, arg);
496			}
497
498			for (i = 0; i < sizeof(hmac_key); i++)
499			hmac_key[i] ^= 0x36; /* ipad */
500			SHA1_Init(&key->head);
501			SHA1_Update(&key->head, hmac_key, sizeof(hmac_key));
502
503			for (i = 0; i < sizeof(hmac_key); i++)
504			hmac_key[i] ^= 0x36 ^ 0x5c; /* opad */
505			SHA1_Init(&key->tail);
506			SHA1_Update(&key->tail, hmac_key, sizeof(hmac_key));
507
508			explicit_bzero(hmac_key, sizeof(hmac_key));
509
510			return 1;
511			}
512			case EVP_CTRL_AEAD_TLS1_AAD:
513			{
514			unsigned char *p = ptr;
515			unsigned int len = p[arg - 2] << 8 \| p[arg - 1];
516
517			if (ctx->encrypt) {
518			key->payload_length = len;
519			if ((key->aux.tls_ver = p[arg - 4] << 8 \|
520			p[arg - 3]) >= TLS1_1_VERSION) {
521			len -= AES_BLOCK_SIZE;
522			p[arg - 2] = len >> 8;
523			p[arg - 1] = len;
524			}
525			key->md = key->head;
526			SHA1_Update(&key->md, p, arg);
527
528			return (int)(((len + SHA_DIGEST_LENGTH +
529			AES_BLOCK_SIZE) & -AES_BLOCK_SIZE) - len);
530			} else {
531			if (arg > 13)
532			arg = 13;
533			memcpy(key->aux.tls_aad, ptr, arg);
534			key->payload_length = arg;
535
536			return SHA_DIGEST_LENGTH;
537			}
538			}
539			default:
540			return -1;
541			}
542			}
543
544			static EVP_CIPHER aesni_128_cbc_hmac_sha1_cipher = {
545			#ifdef NID_aes_128_cbc_hmac_sha1
546			.nid = NID_aes_128_cbc_hmac_sha1,
547			#else
548			.nid = NID_undef,
549			#endif
550			.block_size = 16,
551			.key_len = 16,
552			.iv_len = 16,
553			.flags = EVP_CIPH_CBC_MODE \| EVP_CIPH_FLAG_DEFAULT_ASN1 \|
554			EVP_CIPH_FLAG_AEAD_CIPHER,
555			.init = aesni_cbc_hmac_sha1_init_key,
556			.do_cipher = aesni_cbc_hmac_sha1_cipher,
557			.ctx_size = sizeof(EVP_AES_HMAC_SHA1),
558			.ctrl = aesni_cbc_hmac_sha1_ctrl
559			};
560
561			static EVP_CIPHER aesni_256_cbc_hmac_sha1_cipher = {
562			#ifdef NID_aes_256_cbc_hmac_sha1
563			.nid = NID_aes_256_cbc_hmac_sha1,
564			#else
565			.nid = NID_undef,
566			#endif
567			.block_size = 16,
568			.key_len = 32,
569			.iv_len = 16,
570			.flags = EVP_CIPH_CBC_MODE \| EVP_CIPH_FLAG_DEFAULT_ASN1 \|
571			EVP_CIPH_FLAG_AEAD_CIPHER,
572			.init = aesni_cbc_hmac_sha1_init_key,
573			.do_cipher = aesni_cbc_hmac_sha1_cipher,
574			.ctx_size = sizeof(EVP_AES_HMAC_SHA1),
575			.ctrl = aesni_cbc_hmac_sha1_ctrl
576			};
577
578			const EVP_CIPHER *
579			EVP_aes_128_cbc_hmac_sha1(void)
580		22	{
581	✓✗	22	return OPENSSL_ia32cap_P[1] & AESNI_CAPABLE ?
582			&aesni_128_cbc_hmac_sha1_cipher : NULL;
583			}
584
585			const EVP_CIPHER *
586			EVP_aes_256_cbc_hmac_sha1(void)
587		22	{
588	✓✗	22	return OPENSSL_ia32cap_P[1] & AESNI_CAPABLE ?
589			&aesni_256_cbc_hmac_sha1_cipher : NULL;
590			}
591			#else
592			const EVP_CIPHER *
593			EVP_aes_128_cbc_hmac_sha1(void)
594			{
595			return NULL;
596			}
597
598			const EVP_CIPHER *
599			EVP_aes_256_cbc_hmac_sha1(void)
600			{
601			return NULL;
602			}
603			#endif
604			#endif