[thirdparty/openssl.git] / crypto / cmac / cmac.c

/* crypto/cmac/cmac.c */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project.
 */
/* ====================================================================
 * Copyright (c) 2010 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 <stdlib.h>
#include <string.h>
#include "cryptlib.h"
#include <openssl/cmac.h>

struct CMAC_CTX_st
	{
	/* Cipher context to use */
	EVP_CIPHER_CTX cctx;
	/* Keys k1 and k2 */
	unsigned char k1[EVP_MAX_BLOCK_LENGTH];
	unsigned char k2[EVP_MAX_BLOCK_LENGTH];
	/* Temporary block */
	unsigned char tbl[EVP_MAX_BLOCK_LENGTH];
	/* Last (possibly partial) block */
	unsigned char last_block[EVP_MAX_BLOCK_LENGTH];
	/* Number of bytes in last block: -1 means context not initialised */
	int nlast_block;
	};


/* Make temporary keys K1 and K2 */

static void make_kn(unsigned char *k1, unsigned char *l, int bl)
	{
	int i;
	/* Shift block to left, including carry */
	for (i = 0; i < bl; i++)
		{
		k1[i] = l[i] << 1;
		if (i < bl - 1 && l[i + 1] & 0x80)
			k1[i] |= 1;
		}
	/* If MSB set fixup with R */
	if (l[0] & 0x80)
		k1[bl - 1] ^= bl == 16 ? 0x87 : 0x1b;
	}

CMAC_CTX *CMAC_CTX_new(void)
	{
	CMAC_CTX *ctx;
	ctx = OPENSSL_malloc(sizeof(CMAC_CTX));
	if (!ctx)
		return NULL;
	EVP_CIPHER_CTX_init(&ctx->cctx);
	ctx->nlast_block = -1;
	return ctx;
	}

void CMAC_CTX_cleanup(CMAC_CTX *ctx)
	{
	EVP_CIPHER_CTX_cleanup(&ctx->cctx);
	OPENSSL_cleanse(ctx->tbl, EVP_MAX_BLOCK_LENGTH);
	OPENSSL_cleanse(ctx->k1, EVP_MAX_BLOCK_LENGTH);
	OPENSSL_cleanse(ctx->k2, EVP_MAX_BLOCK_LENGTH);
	OPENSSL_cleanse(ctx->last_block, EVP_MAX_BLOCK_LENGTH);
	ctx->nlast_block = -1;
	}

EVP_CIPHER_CTX *CMAC_CTX_get0_cipher_ctx(CMAC_CTX *ctx)
	{
	return &ctx->cctx;
	}

void CMAC_CTX_free(CMAC_CTX *ctx)
	{
	CMAC_CTX_cleanup(ctx);
	OPENSSL_free(ctx);
	}

int CMAC_Init(CMAC_CTX *ctx, const void *key, size_t keylen, 
			const EVP_CIPHER *cipher, ENGINE *impl)
	{
	static unsigned char zero_iv[EVP_MAX_BLOCK_LENGTH];
	/* All zeros means restart */
	if (!key && !cipher && !impl && keylen == 0)
		{
		/* Not initialised */
		if (ctx->last_block == -1)
			return 0;
		if (!EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, NULL, zero_iv))
			return 0;
		return 0;
		}
	/* Initialiase context */
	if (cipher && !EVP_EncryptInit_ex(&ctx->cctx, cipher, impl, NULL, NULL))
		return 0;
	/* Non-NULL key means initialisation complete */
	if (key)
		{
		int bl;
		if (!EVP_CIPHER_CTX_cipher(&ctx->cctx))
			return 0;
		if (!EVP_CIPHER_CTX_set_key_length(&ctx->cctx, keylen))
			return 0;
		if (!EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, key, zero_iv))
			return 0;
		bl = EVP_CIPHER_CTX_block_size(&ctx->cctx);
		if (!EVP_Cipher(&ctx->cctx, ctx->tbl, zero_iv, bl))
			return 0;
		make_kn(ctx->k1, ctx->tbl, bl);
		make_kn(ctx->k2, ctx->k1, bl);
		OPENSSL_cleanse(ctx->tbl, bl);
		/* Reset context again ready for first data block */
		if (!EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, NULL, zero_iv))
			return 0;
		ctx->nlast_block = 0;
		}
	return 1;
	}

int CMAC_Update(CMAC_CTX *ctx, const void *in, size_t dlen)
	{
	const unsigned char *data = in;
	size_t bl;
	if (ctx->nlast_block == -1)
		return 0;
	if (dlen == 0)
		return 1;
	bl = EVP_CIPHER_CTX_block_size(&ctx->cctx);
	/* Copy into partial block if we need to */
	if (ctx->nlast_block > 0)
		{
		size_t nleft;
		nleft = bl - ctx->nlast_block;
		if (dlen < nleft)
			nleft = dlen;
		memcpy(ctx->last_block + ctx->nlast_block, data, nleft);
		dlen -= nleft;
		ctx->nlast_block += nleft;
		/* If no more to process return */
		if (dlen == 0)
			return 1;
		data += nleft;
		/* Else not final block so encrypt it */
		if (!EVP_Cipher(&ctx->cctx, ctx->tbl, ctx->last_block,bl))
			return 0;
		}
	/* Encrypt all but one of the complete blocks left */
	while(dlen > bl)
		{
		if (!EVP_Cipher(&ctx->cctx, ctx->tbl, data, bl))
			return 0;
		dlen -= bl;
		data += bl;
		}
	/* Copy any data left to last block buffer */
	memcpy(ctx->last_block, data, dlen);
	ctx->nlast_block = dlen;
	return 1;

	}

size_t CMAC_Final(CMAC_CTX *ctx, unsigned char *out)
	{
	int i, bl, lb;
	if (ctx->nlast_block == -1)
		return 0;
	bl = EVP_CIPHER_CTX_block_size(&ctx->cctx);
	lb = ctx->nlast_block;
	/* Is last block complete? */
	if (lb == bl)
		{
		for (i = 0; i < bl; i++)
			ctx->last_block[i] ^= ctx->k1[i];
		}
	else
		{
		ctx->last_block[lb] = 0x80;
		if (bl - lb > 1)
			memset(ctx->last_block + lb + 1, 0, bl - lb - 1);
		for (i = 0; i < bl; i++)
			ctx->last_block[i] ^= ctx->k2[i];
		}
	if (!EVP_Cipher(&ctx->cctx, out, ctx->last_block, bl))
		return 0;
	return bl;
	}
Commit	Line	Data
8c968e03 DSH	1	/* crypto/cmac/cmac.c */
	2	/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
	3	* project.
	4	*/
	5	/* ====================================================================
	6	* Copyright (c) 2010 The OpenSSL Project. All rights reserved.
	7	*
	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions
	10	* are met:
	11	*
	12	* 1. Redistributions of source code must retain the above copyright
	13	* notice, this list of conditions and the following disclaimer.
	14	*
	15	* 2. Redistributions in binary form must reproduce the above copyright
	16	* notice, this list of conditions and the following disclaimer in
	17	* the documentation and/or other materials provided with the
	18	* distribution.
	19	*
	20	* 3. All advertising materials mentioning features or use of this
	21	* software must display the following acknowledgment:
	22	* "This product includes software developed by the OpenSSL Project
	23	* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
	24	*
	25	* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
	26	* endorse or promote products derived from this software without
	27	* prior written permission. For written permission, please contact
	28	* licensing@OpenSSL.org.
	29	*
	30	* 5. Products derived from this software may not be called "OpenSSL"
	31	* nor may "OpenSSL" appear in their names without prior written
	32	* permission of the OpenSSL Project.
	33	*
	34	* 6. Redistributions of any form whatsoever must retain the following
	35	* acknowledgment:
	36	* "This product includes software developed by the OpenSSL Project
	37	* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
	38	*
	39	* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
	40	* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	41	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	42	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
	43	* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	44	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	45	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	46	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	47	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	48	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	49	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
	50	* OF THE POSSIBILITY OF SUCH DAMAGE.
	51	* ====================================================================
	52	*/
	53
	54	#include <stdio.h>
	55	#include <stdlib.h>
	56	#include <string.h>
	57	#include "cryptlib.h"
	58	#include <openssl/cmac.h>
	59
	60	struct CMAC_CTX_st
	61	{
	62	/* Cipher context to use */
	63	EVP_CIPHER_CTX cctx;
	64	/* Keys k1 and k2 */
65	unsigned char k1[EVP_MAX_BLOCK_LENGTH];
66	unsigned char k2[EVP_MAX_BLOCK_LENGTH];
67	/* Temporary block */
68	unsigned char tbl[EVP_MAX_BLOCK_LENGTH];
69	/* Last (possibly partial) block */
70	unsigned char last_block[EVP_MAX_BLOCK_LENGTH];
71	/* Number of bytes in last block: -1 means context not initialised */
72	int nlast_block;
73	};
74
75
76	/* Make temporary keys K1 and K2 */
77
78	static void make_kn(unsigned char k1, unsigned char l, int bl)
79	{
80	int i;
81	/* Shift block to left, including carry */
82	for (i = 0; i < bl; i++)
83	{
84	k1[i] = l[i] << 1;
85	if (i < bl - 1 && l[i + 1] & 0x80)
86	k1[i] \|= 1;
87	}
88	/* If MSB set fixup with R */
89	if (l[0] & 0x80)
90	k1[bl - 1] ^= bl == 16 ? 0x87 : 0x1b;
91	}
92
93	CMAC_CTX *CMAC_CTX_new(void)
94	{
95	CMAC_CTX *ctx;
96	ctx = OPENSSL_malloc(sizeof(CMAC_CTX));
97	if (!ctx)
98	return NULL;
99	EVP_CIPHER_CTX_init(&ctx->cctx);
100	ctx->nlast_block = -1;
101	return ctx;
102	}
103
104	void CMAC_CTX_cleanup(CMAC_CTX *ctx)
105	{
106	EVP_CIPHER_CTX_cleanup(&ctx->cctx);
107	OPENSSL_cleanse(ctx->tbl, EVP_MAX_BLOCK_LENGTH);
108	OPENSSL_cleanse(ctx->k1, EVP_MAX_BLOCK_LENGTH);
109	OPENSSL_cleanse(ctx->k2, EVP_MAX_BLOCK_LENGTH);
110	OPENSSL_cleanse(ctx->last_block, EVP_MAX_BLOCK_LENGTH);
111	ctx->nlast_block = -1;
112	}
113
114	EVP_CIPHER_CTX CMAC_CTX_get0_cipher_ctx(CMAC_CTX ctx)
115	{
116	return &ctx->cctx;
117	}
118
119	void CMAC_CTX_free(CMAC_CTX *ctx)
120	{
121	CMAC_CTX_cleanup(ctx);
122	OPENSSL_free(ctx);
123	}
124
125	int CMAC_Init(CMAC_CTX ctx, const void key, size_t keylen,
126	const EVP_CIPHER cipher, ENGINE impl)
127	{
128	static unsigned char zero_iv[EVP_MAX_BLOCK_LENGTH];
129	/* All zeros means restart */
130	if (!key && !cipher && !impl && keylen == 0)
131	{
132	/* Not initialised */
133	if (ctx->last_block == -1)
134	return 0;
135	if (!EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, NULL, zero_iv))
136	return 0;
137	return 0;
138	}
139	/* Initialiase context */
140	if (cipher && !EVP_EncryptInit_ex(&ctx->cctx, cipher, impl, NULL, NULL))
141	return 0;
142	/* Non-NULL key means initialisation complete */
143	if (key)
144	{
145	int bl;
146	if (!EVP_CIPHER_CTX_cipher(&ctx->cctx))
147	return 0;
148	if (!EVP_CIPHER_CTX_set_key_length(&ctx->cctx, keylen))
149	return 0;
150	if (!EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, key, zero_iv))
151	return 0;
152	bl = EVP_CIPHER_CTX_block_size(&ctx->cctx);
153	if (!EVP_Cipher(&ctx->cctx, ctx->tbl, zero_iv, bl))
154	return 0;
155	make_kn(ctx->k1, ctx->tbl, bl);
156	make_kn(ctx->k2, ctx->k1, bl);
157	OPENSSL_cleanse(ctx->tbl, bl);
158	/* Reset context again ready for first data block */
159	if (!EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, NULL, zero_iv))
160	return 0;
161	ctx->nlast_block = 0;
162	}
163	return 1;
164	}
165
166	int CMAC_Update(CMAC_CTX ctx, const void in, size_t dlen)
167	{
168	const unsigned char *data = in;
169	size_t bl;
170	if (ctx->nlast_block == -1)
171	return 0;
172	if (dlen == 0)
173	return 1;
174	bl = EVP_CIPHER_CTX_block_size(&ctx->cctx);
175	/* Copy into partial block if we need to */
176	if (ctx->nlast_block > 0)
177	{
178	size_t nleft;
179	nleft = bl - ctx->nlast_block;
180	if (dlen < nleft)
181	nleft = dlen;
182	memcpy(ctx->last_block + ctx->nlast_block, data, nleft);
183	dlen -= nleft;
184	ctx->nlast_block += nleft;
185	/* If no more to process return */
186	if (dlen == 0)
187	return 1;
188	data += nleft;
189	/* Else not final block so encrypt it */
190	if (!EVP_Cipher(&ctx->cctx, ctx->tbl, ctx->last_block,bl))
191	return 0;
192	}
193	/* Encrypt all but one of the complete blocks left */
194	while(dlen > bl)
195	{
196	if (!EVP_Cipher(&ctx->cctx, ctx->tbl, data, bl))
197	return 0;
198	dlen -= bl;
199	data += bl;
200	}
201	/* Copy any data left to last block buffer */
202	memcpy(ctx->last_block, data, dlen);
203	ctx->nlast_block = dlen;
204	return 1;
205
206	}
207
208	size_t CMAC_Final(CMAC_CTX ctx, unsigned char out)
209	{
210	int i, bl, lb;
211	if (ctx->nlast_block == -1)
212	return 0;
213	bl = EVP_CIPHER_CTX_block_size(&ctx->cctx);
214	lb = ctx->nlast_block;
215	/* Is last block complete? */
216	if (lb == bl)
217	{
218	for (i = 0; i < bl; i++)
219	ctx->last_block[i] ^= ctx->k1[i];
220	}
221	else
222	{
223	ctx->last_block[lb] = 0x80;
224	if (bl - lb > 1)
225	memset(ctx->last_block + lb + 1, 0, bl - lb - 1);
226	for (i = 0; i < bl; i++)
227	ctx->last_block[i] ^= ctx->k2[i];
228	}
229	if (!EVP_Cipher(&ctx->cctx, out, ctx->last_block, bl))
230	return 0;
231	return bl;
232	}