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298 lines
9.4 KiB
298 lines
9.4 KiB
/* crypto/cmac/cmac.c */ |
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/* |
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* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL |
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* project. |
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*/ |
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/* ==================================================================== |
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* Copyright (c) 2010 The OpenSSL Project. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* 3. All advertising materials mentioning features or use of this |
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* software must display the following acknowledgment: |
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* "This product includes software developed by the OpenSSL Project |
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" |
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* |
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
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* endorse or promote products derived from this software without |
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* prior written permission. For written permission, please contact |
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* licensing@OpenSSL.org. |
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* |
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* 5. Products derived from this software may not be called "OpenSSL" |
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* nor may "OpenSSL" appear in their names without prior written |
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* permission of the OpenSSL Project. |
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* |
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* 6. Redistributions of any form whatsoever must retain the following |
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* acknowledgment: |
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* "This product includes software developed by the OpenSSL Project |
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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* OF THE POSSIBILITY OF SUCH DAMAGE. |
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* ==================================================================== |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include "cryptlib.h" |
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#include <openssl/cmac.h> |
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#ifdef OPENSSL_FIPS |
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# include <openssl/fips.h> |
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#endif |
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struct CMAC_CTX_st { |
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/* Cipher context to use */ |
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EVP_CIPHER_CTX cctx; |
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/* Keys k1 and k2 */ |
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unsigned char k1[EVP_MAX_BLOCK_LENGTH]; |
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unsigned char k2[EVP_MAX_BLOCK_LENGTH]; |
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/* Temporary block */ |
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unsigned char tbl[EVP_MAX_BLOCK_LENGTH]; |
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/* Last (possibly partial) block */ |
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unsigned char last_block[EVP_MAX_BLOCK_LENGTH]; |
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/* Number of bytes in last block: -1 means context not initialised */ |
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int nlast_block; |
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}; |
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/* Make temporary keys K1 and K2 */ |
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static void make_kn(unsigned char *k1, unsigned char *l, int bl) |
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{ |
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int i; |
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/* Shift block to left, including carry */ |
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for (i = 0; i < bl; i++) { |
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k1[i] = l[i] << 1; |
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if (i < bl - 1 && l[i + 1] & 0x80) |
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k1[i] |= 1; |
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} |
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/* If MSB set fixup with R */ |
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if (l[0] & 0x80) |
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k1[bl - 1] ^= bl == 16 ? 0x87 : 0x1b; |
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} |
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CMAC_CTX *CMAC_CTX_new(void) |
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{ |
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CMAC_CTX *ctx; |
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ctx = OPENSSL_malloc(sizeof(CMAC_CTX)); |
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if (!ctx) |
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return NULL; |
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EVP_CIPHER_CTX_init(&ctx->cctx); |
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ctx->nlast_block = -1; |
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return ctx; |
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} |
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void CMAC_CTX_cleanup(CMAC_CTX *ctx) |
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{ |
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#ifdef OPENSSL_FIPS |
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if (FIPS_mode() && !ctx->cctx.engine) { |
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FIPS_cmac_ctx_cleanup(ctx); |
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return; |
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} |
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#endif |
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EVP_CIPHER_CTX_cleanup(&ctx->cctx); |
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OPENSSL_cleanse(ctx->tbl, EVP_MAX_BLOCK_LENGTH); |
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OPENSSL_cleanse(ctx->k1, EVP_MAX_BLOCK_LENGTH); |
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OPENSSL_cleanse(ctx->k2, EVP_MAX_BLOCK_LENGTH); |
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OPENSSL_cleanse(ctx->last_block, EVP_MAX_BLOCK_LENGTH); |
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ctx->nlast_block = -1; |
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} |
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EVP_CIPHER_CTX *CMAC_CTX_get0_cipher_ctx(CMAC_CTX *ctx) |
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{ |
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return &ctx->cctx; |
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} |
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void CMAC_CTX_free(CMAC_CTX *ctx) |
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{ |
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if (!ctx) |
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return; |
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CMAC_CTX_cleanup(ctx); |
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OPENSSL_free(ctx); |
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} |
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int CMAC_CTX_copy(CMAC_CTX *out, const CMAC_CTX *in) |
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{ |
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int bl; |
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if (in->nlast_block == -1) |
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return 0; |
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if (!EVP_CIPHER_CTX_copy(&out->cctx, &in->cctx)) |
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return 0; |
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bl = EVP_CIPHER_CTX_block_size(&in->cctx); |
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memcpy(out->k1, in->k1, bl); |
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memcpy(out->k2, in->k2, bl); |
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memcpy(out->tbl, in->tbl, bl); |
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memcpy(out->last_block, in->last_block, bl); |
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out->nlast_block = in->nlast_block; |
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return 1; |
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} |
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int CMAC_Init(CMAC_CTX *ctx, const void *key, size_t keylen, |
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const EVP_CIPHER *cipher, ENGINE *impl) |
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{ |
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static unsigned char zero_iv[EVP_MAX_BLOCK_LENGTH]; |
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#ifdef OPENSSL_FIPS |
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if (FIPS_mode()) { |
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/* If we have an ENGINE need to allow non FIPS */ |
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if ((impl || ctx->cctx.engine) |
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&& !(ctx->cctx.flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW)) { |
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EVPerr(EVP_F_CMAC_INIT, EVP_R_DISABLED_FOR_FIPS); |
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return 0; |
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} |
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/* |
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* Other algorithm blocking will be done in FIPS_cmac_init, via |
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* FIPS_cipherinit(). |
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*/ |
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if (!impl && !ctx->cctx.engine) |
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return FIPS_cmac_init(ctx, key, keylen, cipher, NULL); |
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} |
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#endif |
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/* All zeros means restart */ |
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if (!key && !cipher && !impl && keylen == 0) { |
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/* Not initialised */ |
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if (ctx->nlast_block == -1) |
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return 0; |
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if (!EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, NULL, zero_iv)) |
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return 0; |
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memset(ctx->tbl, 0, EVP_CIPHER_CTX_block_size(&ctx->cctx)); |
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ctx->nlast_block = 0; |
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return 1; |
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} |
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/* Initialiase context */ |
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if (cipher && !EVP_EncryptInit_ex(&ctx->cctx, cipher, impl, NULL, NULL)) |
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return 0; |
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/* Non-NULL key means initialisation complete */ |
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if (key) { |
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int bl; |
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if (!EVP_CIPHER_CTX_cipher(&ctx->cctx)) |
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return 0; |
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if (!EVP_CIPHER_CTX_set_key_length(&ctx->cctx, keylen)) |
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return 0; |
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if (!EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, key, zero_iv)) |
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return 0; |
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bl = EVP_CIPHER_CTX_block_size(&ctx->cctx); |
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if (!EVP_Cipher(&ctx->cctx, ctx->tbl, zero_iv, bl)) |
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return 0; |
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make_kn(ctx->k1, ctx->tbl, bl); |
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make_kn(ctx->k2, ctx->k1, bl); |
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OPENSSL_cleanse(ctx->tbl, bl); |
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/* Reset context again ready for first data block */ |
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if (!EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, NULL, zero_iv)) |
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return 0; |
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/* Zero tbl so resume works */ |
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memset(ctx->tbl, 0, bl); |
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ctx->nlast_block = 0; |
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} |
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return 1; |
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} |
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int CMAC_Update(CMAC_CTX *ctx, const void *in, size_t dlen) |
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{ |
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const unsigned char *data = in; |
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size_t bl; |
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#ifdef OPENSSL_FIPS |
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if (FIPS_mode() && !ctx->cctx.engine) |
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return FIPS_cmac_update(ctx, in, dlen); |
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#endif |
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if (ctx->nlast_block == -1) |
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return 0; |
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if (dlen == 0) |
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return 1; |
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bl = EVP_CIPHER_CTX_block_size(&ctx->cctx); |
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/* Copy into partial block if we need to */ |
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if (ctx->nlast_block > 0) { |
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size_t nleft; |
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nleft = bl - ctx->nlast_block; |
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if (dlen < nleft) |
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nleft = dlen; |
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memcpy(ctx->last_block + ctx->nlast_block, data, nleft); |
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dlen -= nleft; |
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ctx->nlast_block += nleft; |
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/* If no more to process return */ |
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if (dlen == 0) |
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return 1; |
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data += nleft; |
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/* Else not final block so encrypt it */ |
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if (!EVP_Cipher(&ctx->cctx, ctx->tbl, ctx->last_block, bl)) |
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return 0; |
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} |
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/* Encrypt all but one of the complete blocks left */ |
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while (dlen > bl) { |
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if (!EVP_Cipher(&ctx->cctx, ctx->tbl, data, bl)) |
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return 0; |
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dlen -= bl; |
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data += bl; |
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} |
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/* Copy any data left to last block buffer */ |
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memcpy(ctx->last_block, data, dlen); |
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ctx->nlast_block = dlen; |
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return 1; |
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} |
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int CMAC_Final(CMAC_CTX *ctx, unsigned char *out, size_t *poutlen) |
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{ |
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int i, bl, lb; |
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#ifdef OPENSSL_FIPS |
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if (FIPS_mode() && !ctx->cctx.engine) |
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return FIPS_cmac_final(ctx, out, poutlen); |
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#endif |
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if (ctx->nlast_block == -1) |
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return 0; |
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bl = EVP_CIPHER_CTX_block_size(&ctx->cctx); |
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*poutlen = (size_t)bl; |
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if (!out) |
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return 1; |
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lb = ctx->nlast_block; |
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/* Is last block complete? */ |
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if (lb == bl) { |
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for (i = 0; i < bl; i++) |
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out[i] = ctx->last_block[i] ^ ctx->k1[i]; |
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} else { |
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ctx->last_block[lb] = 0x80; |
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if (bl - lb > 1) |
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memset(ctx->last_block + lb + 1, 0, bl - lb - 1); |
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for (i = 0; i < bl; i++) |
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out[i] = ctx->last_block[i] ^ ctx->k2[i]; |
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} |
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if (!EVP_Cipher(&ctx->cctx, out, out, bl)) { |
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OPENSSL_cleanse(out, bl); |
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return 0; |
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} |
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return 1; |
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} |
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int CMAC_resume(CMAC_CTX *ctx) |
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{ |
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if (ctx->nlast_block == -1) |
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return 0; |
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/* |
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* The buffer "tbl" containes the last fully encrypted block which is the |
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* last IV (or all zeroes if no last encrypted block). The last block has |
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* not been modified since CMAC_final(). So reinitliasing using the last |
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* decrypted block will allow CMAC to continue after calling |
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* CMAC_Final(). |
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*/ |
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return EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, NULL, ctx->tbl); |
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}
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