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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libcrypto/evp/e_aes_cbc_hmac_sha1.c	Lines:	183	222	82.4 %
Date:	2017-11-07	Branches:	50	69	72.5 %


/* $OpenBSD: e_aes_cbc_hmac_sha1.c,v 1.14 2016/11/05 10:47:57 miod 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"

#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__)	)

#include "x86_arch.h"

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

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_cpu_caps() & CPUCAP_MASK_AESNI) ?
	    &aesni_128_cbc_hmac_sha1_cipher : NULL;
}

const EVP_CIPHER *
EVP_aes_256_cbc_hmac_sha1(void)
{
	return (OPENSSL_cpu_caps() & CPUCAP_MASK_AESNI) ?
	    &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 1.14 2016/11/05 10:47:57 miod 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			#define TLS1_1_VERSION 0x0302
66
67			typedef struct {
68			AES_KEY ks;
69			SHA_CTX head, tail, md;
70			size_t payload_length; /* AAD length in decrypt case */
71			union {
72			unsigned int tls_ver;
73			unsigned char tls_aad[16]; /* 13 used */
74			} aux;
75			} EVP_AES_HMAC_SHA1;
76
77			#define NO_PAYLOAD_LENGTH ((size_t)-1)
78
79			#if defined(AES_ASM) && ( \
80			defined(__x86_64) \|\| defined(__x86_64__) \|\| \
81			defined(_M_AMD64) \|\| defined(_M_X64) \|\| \
82			defined(__INTEL__) )
83
84			#include "x86_arch.h"
85
86			#if defined(__GNUC__) && __GNUC__>=2
87			# define BSWAP(x) ({ unsigned int r=(x); asm ("bswapl %0":"=r"(r):"0"(r)); r; })
88			#endif
89
90			int aesni_set_encrypt_key(const unsigned char userKey, int bits, AES_KEY key);
91			int aesni_set_decrypt_key(const unsigned char userKey, int bits, AES_KEY key);
92
93			void aesni_cbc_encrypt(const unsigned char in, unsigned char out,
94			size_t length, const AES_KEY key, unsigned char ivec, int enc);
95
96			void aesni_cbc_sha1_enc (const void inp, void out, size_t blocks,
97			const AES_KEY key, unsigned char iv[16], SHA_CTX ctx, const void *in0);
98
99			#define data(ctx) ((EVP_AES_HMAC_SHA1 *)(ctx)->cipher_data)
100
101			static int
102			aesni_cbc_hmac_sha1_init_key(EVP_CIPHER_CTX ctx, const unsigned char inkey,
103			const unsigned char *iv, int enc)
104			{
105		576	EVP_AES_HMAC_SHA1 *key = data(ctx);
106			int ret;
107
108	✓✓	288	if (enc)
109		144	ret = aesni_set_encrypt_key(inkey, ctx->key_len * 8, &key->ks);
110			else
111		144	ret = aesni_set_decrypt_key(inkey, ctx->key_len * 8, &key->ks);
112
113		288	SHA1_Init(&key->head); /* handy when benchmarking */
114		288	key->tail = key->head;
115		288	key->md = key->head;
116
117		288	key->payload_length = NO_PAYLOAD_LENGTH;
118
119		288	return ret < 0 ? 0 : 1;
120			}
121
122			#define STITCHED_CALL
123
124			#if !defined(STITCHED_CALL)
125			#define aes_off 0
126			#endif
127
128			void sha1_block_data_order (void c, const void p, size_t len);
129
130			static void
131			sha1_update(SHA_CTX c, const void data, size_t len)
132			{
133			const unsigned char *ptr = data;
134			size_t res;
135
136	✓✓	6624	if ((res = c->num)) {
137		576	res = SHA_CBLOCK - res;
138	✓✓	576	if (len < res)
139		432	res = len;
140		576	SHA1_Update(c, ptr, res);
141		576	ptr += res;
142		576	len -= res;
143		576	}
144
145		3312	res = len % SHA_CBLOCK;
146		3312	len -= res;
147
148	✓✓	3312	if (len) {
149		576	sha1_block_data_order(c, ptr, len / SHA_CBLOCK);
150
151		576	ptr += len;
152		576	c->Nh += len >> 29;
153		576	c->Nl += len <<= 3;
154	✗✓	576	if (c->Nl < (unsigned int)len)
155			c->Nh++;
156			}
157
158	✓✓	3312	if (res)
159		2160	SHA1_Update(c, ptr, res);
160		3312	}
161
162			#ifdef SHA1_Update
163			#undef SHA1_Update
164			#endif
165			#define SHA1_Update sha1_update
166
167			static int
168			aesni_cbc_hmac_sha1_cipher(EVP_CIPHER_CTX ctx, unsigned char out,
169			const unsigned char *in, size_t len)
170			{
171		2016	EVP_AES_HMAC_SHA1 *key = data(ctx);
172			unsigned int l;
173		1008	size_t plen = key->payload_length,
174			iv = 0, /* explicit IV in TLS 1.1 and later */
175			sha_off = 0;
176			#if defined(STITCHED_CALL)
177			size_t aes_off = 0, blocks;
178
179		1008	sha_off = SHA_CBLOCK - key->md.num;
180			#endif
181
182		1008	key->payload_length = NO_PAYLOAD_LENGTH;
183
184	✗✓	1008	if (len % AES_BLOCK_SIZE)
185			return 0;
186
187	✓✓	1008	if (ctx->encrypt) {
188	✗✓	576	if (plen == NO_PAYLOAD_LENGTH)
189			plen = len;
190	✗✓	576	else if (len != ((plen + SHA_DIGEST_LENGTH + AES_BLOCK_SIZE) &
191			-AES_BLOCK_SIZE))
192			return 0;
193	✗✓	576	else if (key->aux.tls_ver >= TLS1_1_VERSION)
194			iv = AES_BLOCK_SIZE;
195
196			#if defined(STITCHED_CALL)
197	✓✓✓✗	720	if (plen > (sha_off + iv) &&
198		144	(blocks = (plen - (sha_off + iv)) / SHA_CBLOCK)) {
199		144	SHA1_Update(&key->md, in + iv, sha_off);
200
201		288	aesni_cbc_sha1_enc(in, out, blocks, &key->ks,
202		144	ctx->iv, &key->md, in + iv + sha_off);
203		144	blocks *= SHA_CBLOCK;
204			aes_off += blocks;
205		144	sha_off += blocks;
206		144	key->md.Nh += blocks >> 29;
207		144	key->md.Nl += blocks <<= 3;
208	✗✓	144	if (key->md.Nl < (unsigned int)blocks)
209			key->md.Nh++;
210			} else {
211			sha_off = 0;
212			}
213			#endif
214		576	sha_off += iv;
215		576	SHA1_Update(&key->md, in + sha_off, plen - sha_off);
216
217	✓✗	576	if (plen != len) { /* "TLS" mode of operation */
218	✗✓	576	if (in != out)
219			memcpy(out + aes_off, in + aes_off,
220			plen - aes_off);
221
222			/* calculate HMAC and append it to payload */
223		576	SHA1_Final(out + plen, &key->md);
224		576	key->md = key->tail;
225		576	SHA1_Update(&key->md, out + plen, SHA_DIGEST_LENGTH);
226		576	SHA1_Final(out + plen, &key->md);
227
228			/* pad the payload\|hmac */
229		576	plen += SHA_DIGEST_LENGTH;
230	✓✓	14400	for (l = len - plen - 1; plen < len; plen++)
231		6624	out[plen] = l;
232
233			/* encrypt HMAC\|padding at once */
234		1152	aesni_cbc_encrypt(out + aes_off, out + aes_off,
235		576	len - aes_off, &key->ks, ctx->iv, 1);
236		576	} else {
237			aesni_cbc_encrypt(in + aes_off, out + aes_off,
238			len - aes_off, &key->ks, ctx->iv, 1);
239			}
240			} else {
241		432	union {
242			unsigned int u[SHA_DIGEST_LENGTH/sizeof(unsigned int)];
243			unsigned char c[32 + SHA_DIGEST_LENGTH];
244			} mac, *pmac;
245
246			/* arrange cache line alignment */
247		432	pmac = (void *)(((size_t)mac.c + 31) & ((size_t)0 - 32));
248
249			/* decrypt HMAC\|padding at once */
250		432	aesni_cbc_encrypt(in, out, len, &key->ks, ctx->iv, 0);
251
252	✓✗	432	if (plen) { /* "TLS" mode of operation */
253			size_t inp_len, mask, j, i;
254			unsigned int res, maxpad, pad, bitlen;
255			int ret = 1;
256			union {
257			unsigned int u[SHA_LBLOCK];
258			unsigned char c[SHA_CBLOCK];
259			}
260		432	data = (void )key->md.data;
261
262	✗✓	1296	if ((key->aux.tls_aad[plen - 4] << 8 \|
263		864	key->aux.tls_aad[plen - 3]) >= TLS1_1_VERSION)
264			iv = AES_BLOCK_SIZE;
265
266	✗✓	432	if (len < (iv + SHA_DIGEST_LENGTH + 1))
267			return 0;
268
269			/* omit explicit iv */
270		432	out += iv;
271		432	len -= iv;
272
273			/* figure out payload length */
274		432	pad = out[len - 1];
275		432	maxpad = len - (SHA_DIGEST_LENGTH + 1);
276		432	maxpad \|= (255 - maxpad) >> (sizeof(maxpad) * 8 - 8);
277		432	maxpad &= 255;
278
279		432	ret &= constant_time_ge(maxpad, pad);
280
281		432	inp_len = len - (SHA_DIGEST_LENGTH + pad + 1);
282		432	mask = (0 - ((inp_len - len) >>
283			(sizeof(inp_len) * 8 - 1)));
284		432	inp_len &= mask;
285		432	ret &= (int)mask;
286
287		432	key->aux.tls_aad[plen - 2] = inp_len >> 8;
288		432	key->aux.tls_aad[plen - 1] = inp_len;
289
290			/* calculate HMAC */
291		432	key->md = key->head;
292		432	SHA1_Update(&key->md, key->aux.tls_aad, plen);
293
294			#if 1
295		432	len -= SHA_DIGEST_LENGTH; /* amend mac */
296	✗✓	432	if (len >= (256 + SHA_CBLOCK)) {
297			j = (len - (256 + SHA_CBLOCK)) &
298			(0 - SHA_CBLOCK);
299			j += SHA_CBLOCK - key->md.num;
300			SHA1_Update(&key->md, out, j);
301			out += j;
302			len -= j;
303			inp_len -= j;
304			}
305
306			/* but pretend as if we hashed padded payload */
307		432	bitlen = key->md.Nl + (inp_len << 3); /* at most 18 bits */
308			#ifdef BSWAP
309		432	bitlen = BSWAP(bitlen);
310			#else
311			mac.c[0] = 0;
312			mac.c[1] = (unsigned char)(bitlen >> 16);
313			mac.c[2] = (unsigned char)(bitlen >> 8);
314			mac.c[3] = (unsigned char)bitlen;
315			bitlen = mac.u[0];
316			#endif
317
318		432	pmac->u[0] = 0;
319		432	pmac->u[1] = 0;
320		432	pmac->u[2] = 0;
321		432	pmac->u[3] = 0;
322		432	pmac->u[4] = 0;
323
324	✓✓	89568	for (res = key->md.num, j = 0; j < len; j++) {
325		44352	size_t c = out[j];
326		44352	mask = (j - inp_len) >> (sizeof(j) * 8 - 8);
327		44352	c &= mask;
328		88704	c \|= 0x80 & ~mask &
329		44352	~((inp_len - j) >> (sizeof(j) * 8 - 8));
330		44352	data->c[res++] = (unsigned char)c;
331
332	✓✓	44352	if (res != SHA_CBLOCK)
333		43776	continue;
334
335			/* j is not incremented yet */
336		576	mask = 0 - ((inp_len + 7 - j) >>
337			(sizeof(j) * 8 - 1));
338		576	data->u[SHA_LBLOCK - 1] \|= bitlen&mask;
339		576	sha1_block_data_order(&key->md, data, 1);
340		576	mask &= 0 - ((j - inp_len - 72) >>
341			(sizeof(j) * 8 - 1));
342		576	pmac->u[0] \|= key->md.h0 & mask;
343		576	pmac->u[1] \|= key->md.h1 & mask;
344		576	pmac->u[2] \|= key->md.h2 & mask;
345		576	pmac->u[3] \|= key->md.h3 & mask;
346		576	pmac->u[4] \|= key->md.h4 & mask;
347			res = 0;
348		576	}
349
350	✓✓	29952	for (i = res; i < SHA_CBLOCK; i++, j++)
351		14544	data->c[i] = 0;
352
353	✗✓	432	if (res > SHA_CBLOCK - 8) {
354			mask = 0 - ((inp_len + 8 - j) >>
355			(sizeof(j) * 8 - 1));
356			data->u[SHA_LBLOCK - 1] \|= bitlen & mask;
357			sha1_block_data_order(&key->md, data, 1);
358			mask &= 0 - ((j - inp_len - 73) >>
359			(sizeof(j) * 8 - 1));
360			pmac->u[0] \|= key->md.h0 & mask;
361			pmac->u[1] \|= key->md.h1 & mask;
362			pmac->u[2] \|= key->md.h2 & mask;
363			pmac->u[3] \|= key->md.h3 & mask;
364			pmac->u[4] \|= key->md.h4 & mask;
365
366			memset(data, 0, SHA_CBLOCK);
367			j += 64;
368			}
369		432	data->u[SHA_LBLOCK - 1] = bitlen;
370		432	sha1_block_data_order(&key->md, data, 1);
371		432	mask = 0 - ((j - inp_len - 73) >> (sizeof(j) * 8 - 1));
372		432	pmac->u[0] \|= key->md.h0 & mask;
373		432	pmac->u[1] \|= key->md.h1 & mask;
374		432	pmac->u[2] \|= key->md.h2 & mask;
375		432	pmac->u[3] \|= key->md.h3 & mask;
376		432	pmac->u[4] \|= key->md.h4 & mask;
377
378			#ifdef BSWAP
379		432	pmac->u[0] = BSWAP(pmac->u[0]);
380		432	pmac->u[1] = BSWAP(pmac->u[1]);
381		432	pmac->u[2] = BSWAP(pmac->u[2]);
382		432	pmac->u[3] = BSWAP(pmac->u[3]);
383		432	pmac->u[4] = BSWAP(pmac->u[4]);
384			#else
385			for (i = 0; i < 5; i++) {
386			res = pmac->u[i];
387			pmac->c[4 * i + 0] = (unsigned char)(res >> 24);
388			pmac->c[4 * i + 1] = (unsigned char)(res >> 16);
389			pmac->c[4 * i + 2] = (unsigned char)(res >> 8);
390			pmac->c[4 * i + 3] = (unsigned char)res;
391			}
392			#endif
393		432	len += SHA_DIGEST_LENGTH;
394			#else
395			SHA1_Update(&key->md, out, inp_len);
396			res = key->md.num;
397			SHA1_Final(pmac->c, &key->md);
398
399			{
400			unsigned int inp_blocks, pad_blocks;
401
402			/* but pretend as if we hashed padded payload */
403			inp_blocks = 1 + ((SHA_CBLOCK - 9 - res) >>
404			(sizeof(res) * 8 - 1));
405			res += (unsigned int)(len - inp_len);
406			pad_blocks = res / SHA_CBLOCK;
407			res %= SHA_CBLOCK;
408			pad_blocks += 1 + ((SHA_CBLOCK - 9 - res) >>
409			(sizeof(res) * 8 - 1));
410			for (; inp_blocks < pad_blocks; inp_blocks++)
411			sha1_block_data_order(&key->md,
412			data, 1);
413			}
414			#endif
415		432	key->md = key->tail;
416		432	SHA1_Update(&key->md, pmac->c, SHA_DIGEST_LENGTH);
417		432	SHA1_Final(pmac->c, &key->md);
418
419			/* verify HMAC */
420		432	out += inp_len;
421		432	len -= inp_len;
422			#if 1
423			{
424			unsigned char *p =
425		432	out + len - 1 - maxpad - SHA_DIGEST_LENGTH;
426		432	size_t off = out - p;
427			unsigned int c, cmask;
428
429		432	maxpad += SHA_DIGEST_LENGTH;
430	✓✓	102528	for (res = 0, i = 0, j = 0; j < maxpad; j++) {
431		50832	c = p[j];
432		50832	cmask = ((int)(j - off -
433		50832	SHA_DIGEST_LENGTH)) >>
434			(sizeof(int) * 8 - 1);
435		50832	res \|= (c ^ pad) & ~cmask; /* ... and padding */
436		50832	cmask &= ((int)(off - 1 - j)) >>
437			(sizeof(int) * 8 - 1);
438		50832	res \|= (c ^ pmac->c[i]) & cmask;
439		50832	i += 1 & cmask;
440			}
441			maxpad -= SHA_DIGEST_LENGTH;
442
443		432	res = 0 - ((0 - res) >> (sizeof(res) * 8 - 1));
444		432	ret &= (int)~res;
445			}
446			#else
447			for (res = 0, i = 0; i < SHA_DIGEST_LENGTH; i++)
448			res \|= out[i] ^ pmac->c[i];
449			res = 0 - ((0 - res) >> (sizeof(res) * 8 - 1));
450			ret &= (int)~res;
451
452			/* verify padding */
453			pad = (pad & ~res) \| (maxpad & res);
454			out = out + len - 1 - pad;
455			for (res = 0, i = 0; i < pad; i++)
456			res \|= out[i] ^ pad;
457
458			res = (0 - res) >> (sizeof(res) * 8 - 1);
459			ret &= (int)~res;
460			#endif
461		432	return ret;
462			} else {
463			SHA1_Update(&key->md, out, len);
464			}
465	✗✓	432	}
466
467		576	return 1;
468		1008	}
469
470			static int
471			aesni_cbc_hmac_sha1_ctrl(EVP_CIPHER_CTX ctx, int type, int arg, void ptr)
472			{
473		2592	EVP_AES_HMAC_SHA1 *key = data(ctx);
474
475	✓✓✗	1296	switch (type) {
476			case EVP_CTRL_AEAD_SET_MAC_KEY:
477			{
478			unsigned int i;
479		288	unsigned char hmac_key[64];
480
481		288	memset(hmac_key, 0, sizeof(hmac_key));
482
483	✗✓	288	if (arg > (int)sizeof(hmac_key)) {
484			SHA1_Init(&key->head);
485			SHA1_Update(&key->head, ptr, arg);
486			SHA1_Final(hmac_key, &key->head);
487			} else {
488		288	memcpy(hmac_key, ptr, arg);
489			}
490
491	✓✓	37440	for (i = 0; i < sizeof(hmac_key); i++)
492		18432	hmac_key[i] ^= 0x36; /* ipad */
493		288	SHA1_Init(&key->head);
494		288	SHA1_Update(&key->head, hmac_key, sizeof(hmac_key));
495
496	✓✓	37440	for (i = 0; i < sizeof(hmac_key); i++)
497		18432	hmac_key[i] ^= 0x36 ^ 0x5c; /* opad */
498		288	SHA1_Init(&key->tail);
499		288	SHA1_Update(&key->tail, hmac_key, sizeof(hmac_key));
500
501		288	explicit_bzero(hmac_key, sizeof(hmac_key));
502
503			return 1;
504		288	}
505			case EVP_CTRL_AEAD_TLS1_AAD:
506			{
507			unsigned char *p = ptr;
508		1008	unsigned int len = p[arg - 2] << 8 \| p[arg - 1];
509
510	✓✓	1008	if (ctx->encrypt) {
511		576	key->payload_length = len;
512	✗✓	1728	if ((key->aux.tls_ver = p[arg - 4] << 8 \|
513		1152	p[arg - 3]) >= TLS1_1_VERSION) {
514			len -= AES_BLOCK_SIZE;
515			p[arg - 2] = len >> 8;
516			p[arg - 1] = len;
517			}
518		576	key->md = key->head;
519		576	SHA1_Update(&key->md, p, arg);
520
521		1152	return (int)(((len + SHA_DIGEST_LENGTH +
522		576	AES_BLOCK_SIZE) & -AES_BLOCK_SIZE) - len);
523			} else {
524	✗✓	432	if (arg > 13)
525			arg = 13;
526		432	memcpy(key->aux.tls_aad, ptr, arg);
527		432	key->payload_length = arg;
528
529		432	return SHA_DIGEST_LENGTH;
530			}
531			}
532			default:
533			return -1;
534			}
535		1296	}
536
537			static EVP_CIPHER aesni_128_cbc_hmac_sha1_cipher = {
538			#ifdef NID_aes_128_cbc_hmac_sha1
539			.nid = NID_aes_128_cbc_hmac_sha1,
540			#else
541			.nid = NID_undef,
542			#endif
543			.block_size = 16,
544			.key_len = 16,
545			.iv_len = 16,
546			.flags = EVP_CIPH_CBC_MODE \| EVP_CIPH_FLAG_DEFAULT_ASN1 \|
547			EVP_CIPH_FLAG_AEAD_CIPHER,
548			.init = aesni_cbc_hmac_sha1_init_key,
549			.do_cipher = aesni_cbc_hmac_sha1_cipher,
550			.ctx_size = sizeof(EVP_AES_HMAC_SHA1),
551			.ctrl = aesni_cbc_hmac_sha1_ctrl
552			};
553
554			static EVP_CIPHER aesni_256_cbc_hmac_sha1_cipher = {
555			#ifdef NID_aes_256_cbc_hmac_sha1
556			.nid = NID_aes_256_cbc_hmac_sha1,
557			#else
558			.nid = NID_undef,
559			#endif
560			.block_size = 16,
561			.key_len = 32,
562			.iv_len = 16,
563			.flags = EVP_CIPH_CBC_MODE \| EVP_CIPH_FLAG_DEFAULT_ASN1 \|
564			EVP_CIPH_FLAG_AEAD_CIPHER,
565			.init = aesni_cbc_hmac_sha1_init_key,
566			.do_cipher = aesni_cbc_hmac_sha1_cipher,
567			.ctx_size = sizeof(EVP_AES_HMAC_SHA1),
568			.ctrl = aesni_cbc_hmac_sha1_ctrl
569			};
570
571			const EVP_CIPHER *
572			EVP_aes_128_cbc_hmac_sha1(void)
573			{
574		9036	return (OPENSSL_cpu_caps() & CPUCAP_MASK_AESNI) ?
575			&aesni_128_cbc_hmac_sha1_cipher : NULL;
576			}
577
578			const EVP_CIPHER *
579			EVP_aes_256_cbc_hmac_sha1(void)
580			{
581		9036	return (OPENSSL_cpu_caps() & CPUCAP_MASK_AESNI) ?
582			&aesni_256_cbc_hmac_sha1_cipher : NULL;
583			}
584			#else
585			const EVP_CIPHER *
586			EVP_aes_128_cbc_hmac_sha1(void)
587			{
588			return NULL;
589			}
590
591			const EVP_CIPHER *
592			EVP_aes_256_cbc_hmac_sha1(void)
593			{
594			return NULL;
595			}
596			#endif
597			#endif