-/* 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/)"
+/*
+ * Copyright 2010-2024 The OpenSSL Project Authors. All Rights Reserved.
*
- * 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.
- * ====================================================================
+ * Licensed under the Apache License 2.0 (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
*/
-#define OPENSSL_FIPSAPI
+/*
+ * CMAC low level APIs are deprecated for public use, but still ok for internal
+ * use.
+ */
+#include "internal/deprecated.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include "cryptlib.h"
+#include "internal/cryptlib.h"
#include <openssl/cmac.h>
+#include <openssl/err.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;
- };
-
+#define LOCAL_BUF_SIZE 2048
+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, const unsigned char *l, int bl)
- {
- int i;
- unsigned char c = l[0], carry = c>>7, cnext;
+{
+ int i;
+ unsigned char c = l[0], carry = c >> 7, cnext;
- /* Shift block to left, including carry */
- for (i = 0; i < bl-1; i++, c = cnext)
- k1[i] = (c << 1) | ((cnext=l[i+1]) >> 7);
+ /* Shift block to left, including carry */
+ for (i = 0; i < bl - 1; i++, c = cnext)
+ k1[i] = (c << 1) | ((cnext = l[i + 1]) >> 7);
- /* If MSB set fixup with R */
- k1[i] = (c << 1) ^ ((0-carry)&(bl==16?0x87:0x1b));
- }
+ /* If MSB set fixup with R */
+ k1[i] = (c << 1) ^ ((0 - carry) & (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;
- }
+{
+ CMAC_CTX *ctx;
+
+ if ((ctx = OPENSSL_malloc(sizeof(*ctx))) == NULL)
+ return NULL;
+ ctx->cctx = EVP_CIPHER_CTX_new();
+ if (ctx->cctx == NULL) {
+ OPENSSL_free(ctx);
+ return NULL;
+ }
+ 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_reset(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;
- }
+{
+ return ctx->cctx;
+}
void CMAC_CTX_free(CMAC_CTX *ctx)
- {
- CMAC_CTX_cleanup(ctx);
- OPENSSL_free(ctx);
- }
+{
+ if (!ctx)
+ return;
+ CMAC_CTX_cleanup(ctx);
+ EVP_CIPHER_CTX_free(ctx->cctx);
+ 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 = M_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 bl;
+
+ if (in->nlast_block == -1)
+ return 0;
+ if ((bl = EVP_CIPHER_CTX_get_block_size(in->cctx)) == 0)
+ return 0;
+ if (!EVP_CIPHER_CTX_copy(out->cctx, in->cctx))
+ return 0;
+ 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 const unsigned char zero_iv[EVP_MAX_BLOCK_LENGTH] = { 0 };
+ int block_len;
+
+ /* 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;
+ block_len = EVP_CIPHER_CTX_get_block_size(ctx->cctx);
+ if (block_len == 0)
+ return 0;
+ memset(ctx->tbl, 0, block_len);
+ ctx->nlast_block = 0;
+ return 1;
+ }
+ /* Initialise context */
+ if (cipher != NULL) {
+ /* Ensure we can't use this ctx until we also have a key */
+ ctx->nlast_block = -1;
+ if (!EVP_EncryptInit_ex(ctx->cctx, cipher, impl, NULL, NULL))
+ return 0;
+ }
+ /* Non-NULL key means initialisation complete */
+ if (key != NULL) {
+ int bl;
-int CMAC_Init(CMAC_CTX *ctx, const void *key, size_t keylen,
- const EVP_CIPHER *cipher, ENGINE *impl)
- {
- __fips_constseg
- static const unsigned char zero_iv[EVP_MAX_BLOCK_LENGTH] = {0};
- /* All zeros means restart */
- if (!key && !cipher && !impl && keylen == 0)
- {
- /* Not initialised */
- if (ctx->nlast_block == -1)
- return 0;
- if (!M_EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, NULL, zero_iv))
- return 0;
- return 1;
- }
- /* Initialiase context */
- if (cipher && !M_EVP_EncryptInit_ex(&ctx->cctx, cipher, impl, NULL, NULL))
- return 0;
- /* Non-NULL key means initialisation complete */
- if (key)
- {
- int bl;
- if (!M_EVP_CIPHER_CTX_cipher(&ctx->cctx))
- return 0;
- if (!EVP_CIPHER_CTX_set_key_length(&ctx->cctx, keylen))
- return 0;
- if (!M_EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, key, zero_iv))
- return 0;
- bl = M_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 (!M_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;
- }
+ /* If anything fails then ensure we can't use this ctx */
+ ctx->nlast_block = -1;
+ if (EVP_CIPHER_CTX_get0_cipher(ctx->cctx) == NULL)
+ return 0;
+ if (EVP_CIPHER_CTX_set_key_length(ctx->cctx, keylen) <= 0)
+ return 0;
+ if (!EVP_EncryptInit_ex(ctx->cctx, NULL, NULL, key, zero_iv))
+ return 0;
+ if ((bl = EVP_CIPHER_CTX_get_block_size(ctx->cctx)) < 0)
+ return 0;
+ if (EVP_Cipher(ctx->cctx, ctx->tbl, zero_iv, bl) <= 0)
+ 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;
- if (ctx->nlast_block == -1)
- return 0;
- if (dlen == 0)
- return 1;
- bl = M_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;
+{
+ const unsigned char *data = in;
+ int bl;
+ size_t max_burst_blocks, cipher_blocks;
+ unsigned char buf[LOCAL_BUF_SIZE];
- }
+ if (ctx->nlast_block == -1)
+ return 0;
+ if (dlen == 0)
+ return 1;
+ if ((bl = EVP_CIPHER_CTX_get_block_size(ctx->cctx)) == 0)
+ return 0;
+ /* 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) <= 0)
+ return 0;
+ }
+ /* Encrypt all but one of the complete blocks left */
+
+ max_burst_blocks = LOCAL_BUF_SIZE / bl;
+ cipher_blocks = (dlen - 1) / bl;
+ if (max_burst_blocks == 0) {
+ /*
+ * When block length is greater than local buffer size,
+ * use ctx->tbl as cipher output.
+ */
+ while (dlen > (size_t)bl) {
+ if (EVP_Cipher(ctx->cctx, ctx->tbl, data, bl) <= 0)
+ return 0;
+ dlen -= bl;
+ data += bl;
+ }
+ } else {
+ while (cipher_blocks > max_burst_blocks) {
+ if (EVP_Cipher(ctx->cctx, buf, data, max_burst_blocks * bl) <= 0)
+ return 0;
+ dlen -= max_burst_blocks * bl;
+ data += max_burst_blocks * bl;
+ cipher_blocks -= max_burst_blocks;
+ }
+ if (cipher_blocks > 0) {
+ if (EVP_Cipher(ctx->cctx, buf, data, cipher_blocks * bl) <= 0)
+ return 0;
+ dlen -= cipher_blocks * bl;
+ data += cipher_blocks * bl;
+ memcpy(ctx->tbl, &buf[(cipher_blocks - 1) * bl], 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;
- if (ctx->nlast_block == -1)
- return 0;
- bl = M_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 i, bl, lb;
+
+ if (ctx->nlast_block == -1)
+ return 0;
+ if ((bl = EVP_CIPHER_CTX_get_block_size(ctx->cctx)) == 0)
+ return 0;
+ if (poutlen != NULL)
+ *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) <= 0) {
+ 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 M_EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, NULL, ctx->tbl);
- }
+{
+ if (ctx->nlast_block == -1)
+ return 0;
+ /*
+ * The buffer "tbl" contains 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 reinitialising 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);
+}
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