678948068b
-=-=-=-=-=-=-=-=-=-=-=-=-= -Begin work on Navigation Meshes (simple pathfinding for now, will improve soon) -More doc on theme overriding -Upgraded OpenSSL to version without bugs -Misc bugfixes
309 lines
8.6 KiB
C
309 lines
8.6 KiB
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>
|
|
|
|
#ifdef OPENSSL_FIPS
|
|
#include <openssl/fips.h>
|
|
#endif
|
|
|
|
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)
|
|
{
|
|
#ifdef OPENSSL_FIPS
|
|
if (FIPS_mode() && !ctx->cctx.engine)
|
|
{
|
|
FIPS_cmac_ctx_cleanup(ctx);
|
|
return;
|
|
}
|
|
#endif
|
|
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_CTX_copy(CMAC_CTX *out, const CMAC_CTX *in)
|
|
{
|
|
int bl;
|
|
if (in->nlast_block == -1)
|
|
return 0;
|
|
if (!EVP_CIPHER_CTX_copy(&out->cctx, &in->cctx))
|
|
return 0;
|
|
bl = EVP_CIPHER_CTX_block_size(&in->cctx);
|
|
memcpy(out->k1, in->k1, bl);
|
|
memcpy(out->k2, in->k2, bl);
|
|
memcpy(out->tbl, in->tbl, bl);
|
|
memcpy(out->last_block, in->last_block, bl);
|
|
out->nlast_block = in->nlast_block;
|
|
return 1;
|
|
}
|
|
|
|
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];
|
|
#ifdef OPENSSL_FIPS
|
|
if (FIPS_mode())
|
|
{
|
|
/* If we have an ENGINE need to allow non FIPS */
|
|
if ((impl || ctx->cctx.engine)
|
|
&& !(ctx->cctx.flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW))
|
|
|
|
{
|
|
EVPerr(EVP_F_CMAC_INIT, EVP_R_DISABLED_FOR_FIPS);
|
|
return 0;
|
|
}
|
|
/* Other algorithm blocking will be done in FIPS_cmac_init,
|
|
* via FIPS_cipherinit().
|
|
*/
|
|
if (!impl && !ctx->cctx.engine)
|
|
return FIPS_cmac_init(ctx, key, keylen, cipher, NULL);
|
|
}
|
|
#endif
|
|
/* All zeros means restart */
|
|
if (!key && !cipher && !impl && keylen == 0)
|
|
{
|
|
/* Not initialised */
|
|
if (ctx->nlast_block == -1)
|
|
return 0;
|
|
if (!EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, NULL, zero_iv))
|
|
return 0;
|
|
memset(ctx->tbl, 0, EVP_CIPHER_CTX_block_size(&ctx->cctx));
|
|
ctx->nlast_block = 0;
|
|
return 1;
|
|
}
|
|
/* 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;
|
|
/* Zero tbl so resume works */
|
|
memset(ctx->tbl, 0, bl);
|
|
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;
|
|
#ifdef OPENSSL_FIPS
|
|
if (FIPS_mode() && !ctx->cctx.engine)
|
|
return FIPS_cmac_update(ctx, in, dlen);
|
|
#endif
|
|
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;
|
|
|
|
}
|
|
|
|
int CMAC_Final(CMAC_CTX *ctx, unsigned char *out, size_t *poutlen)
|
|
{
|
|
int i, bl, lb;
|
|
#ifdef OPENSSL_FIPS
|
|
if (FIPS_mode() && !ctx->cctx.engine)
|
|
return FIPS_cmac_final(ctx, out, poutlen);
|
|
#endif
|
|
if (ctx->nlast_block == -1)
|
|
return 0;
|
|
bl = EVP_CIPHER_CTX_block_size(&ctx->cctx);
|
|
*poutlen = (size_t)bl;
|
|
if (!out)
|
|
return 1;
|
|
lb = ctx->nlast_block;
|
|
/* Is last block complete? */
|
|
if (lb == bl)
|
|
{
|
|
for (i = 0; i < bl; i++)
|
|
out[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++)
|
|
out[i] = ctx->last_block[i] ^ ctx->k2[i];
|
|
}
|
|
if (!EVP_Cipher(&ctx->cctx, out, out, bl))
|
|
{
|
|
OPENSSL_cleanse(out, bl);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
int CMAC_resume(CMAC_CTX *ctx)
|
|
{
|
|
if (ctx->nlast_block == -1)
|
|
return 0;
|
|
/* The buffer "tbl" containes the last fully encrypted block
|
|
* which is the last IV (or all zeroes if no last encrypted block).
|
|
* The last block has not been modified since CMAC_final().
|
|
* So reinitliasing using the last decrypted block will allow
|
|
* CMAC to continue after calling CMAC_Final().
|
|
*/
|
|
return EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, NULL, ctx->tbl);
|
|
}
|