-/* ====================================================================
- * Copyright (c) 2014 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
- * openssl-core@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/)"
+/*
+ * Copyright 2014-2016 The OpenSSL Project Authors. All Rights Reserved.
*
- * 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 OpenSSL license (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
*/
#include <string.h>
/* We don't have it - so calculate it */
if (idx >= ctx->max_l_index) {
+ void *tmp_ptr;
/*
* Each additional entry allows to process almost double as
* much data, so that in linear world the table will need to
* the index.
*/
ctx->max_l_index += (idx - ctx->max_l_index + 4) & ~3;
- ctx->l =
+ tmp_ptr =
OPENSSL_realloc(ctx->l, ctx->max_l_index * sizeof(OCB_BLOCK));
- if (!ctx->l)
+ if (tmp_ptr == NULL) /* prevent ctx->l from being clobbered */
return NULL;
+ ctx->l = tmp_ptr;
}
while (l_index < idx) {
ocb_double(ctx->l + l_index, ctx->l + l_index + 1);
return ctx->l + idx;
}
-/*
- * Encrypt a block from |in| and store the result in |out|
- */
-static void ocb_encrypt(OCB128_CONTEXT *ctx, OCB_BLOCK *in, OCB_BLOCK *out,
- void *keyenc)
-{
- ctx->encrypt(in->c, out->c, keyenc);
-}
-
-/*
- * Decrypt a block from |in| and store the result in |out|
- */
-static void ocb_decrypt(OCB128_CONTEXT *ctx, OCB_BLOCK *in, OCB_BLOCK *out,
- void *keydec)
-{
- ctx->decrypt(in->c, out->c, keydec);
-}
-
/*
* Create a new OCB128_CONTEXT
*/
OCB128_CONTEXT *CRYPTO_ocb128_new(void *keyenc, void *keydec,
- block128_f encrypt, block128_f decrypt)
+ block128_f encrypt, block128_f decrypt,
+ ocb128_f stream)
{
OCB128_CONTEXT *octx;
int ret;
if ((octx = OPENSSL_malloc(sizeof(*octx))) != NULL) {
- ret = CRYPTO_ocb128_init(octx, keyenc, keydec, encrypt, decrypt);
+ ret = CRYPTO_ocb128_init(octx, keyenc, keydec, encrypt, decrypt,
+ stream);
if (ret)
return octx;
OPENSSL_free(octx);
* Initialise an existing OCB128_CONTEXT
*/
int CRYPTO_ocb128_init(OCB128_CONTEXT *ctx, void *keyenc, void *keydec,
- block128_f encrypt, block128_f decrypt)
+ block128_f encrypt, block128_f decrypt,
+ ocb128_f stream)
{
memset(ctx, 0, sizeof(*ctx));
ctx->l_index = 0;
*/
ctx->encrypt = encrypt;
ctx->decrypt = decrypt;
+ ctx->stream = stream;
ctx->keyenc = keyenc;
ctx->keydec = keydec;
/* L_* = ENCIPHER(K, zeros(128)) */
- ocb_encrypt(ctx, &ctx->l_star, &ctx->l_star, ctx->keyenc);
+ ctx->encrypt(ctx->l_star.c, ctx->l_star.c, ctx->keyenc);
/* L_$ = double(L_*) */
ocb_double(&ctx->l_star, &ctx->l_dollar);
/*
* Spec says IV is 120 bits or fewer - it allows non byte aligned lengths.
- * We don't support this at this stage
+ * We don't support this at this stage
*/
if ((len > 15) || (len < 1) || (taglen > 16) || (taglen < 1)) {
return -1;
int CRYPTO_ocb128_aad(OCB128_CONTEXT *ctx, const unsigned char *aad,
size_t len)
{
- u64 all_num_blocks, num_blocks;
- u64 i;
+ u64 i, all_num_blocks;
+ size_t num_blocks, last_len;
OCB_BLOCK tmp1;
OCB_BLOCK tmp2;
- int last_len;
/* Calculate the number of blocks of AAD provided now, and so far */
num_blocks = len / 16;
/* Offset_i = Offset_{i-1} xor L_{ntz(i)} */
lookup = ocb_lookup_l(ctx, ocb_ntz(i));
- if (!lookup)
+ if (lookup == NULL)
return 0;
ocb_block16_xor(&ctx->offset_aad, lookup, &ctx->offset_aad);
/* Sum_i = Sum_{i-1} xor ENCIPHER(K, A_i xor Offset_i) */
aad_block = (OCB_BLOCK *)(aad + ((i - ctx->blocks_hashed - 1) * 16));
ocb_block16_xor(&ctx->offset_aad, aad_block, &tmp1);
- ocb_encrypt(ctx, &tmp1, &tmp2, ctx->keyenc);
+ ctx->encrypt(tmp1.c, tmp2.c, ctx->keyenc);
ocb_block16_xor(&ctx->sum, &tmp2, &ctx->sum);
}
ocb_block16_xor(&ctx->offset_aad, &tmp1, &tmp2);
/* Sum = Sum_m xor ENCIPHER(K, CipherInput) */
- ocb_encrypt(ctx, &tmp2, &tmp1, ctx->keyenc);
+ ctx->encrypt(tmp2.c, tmp1.c, ctx->keyenc);
ocb_block16_xor(&ctx->sum, &tmp1, &ctx->sum);
}
const unsigned char *in, unsigned char *out,
size_t len)
{
- u64 i;
- u64 all_num_blocks, num_blocks;
+ u64 i, all_num_blocks;
+ size_t num_blocks, last_len;
OCB_BLOCK tmp1;
OCB_BLOCK tmp2;
OCB_BLOCK pad;
- int last_len;
/*
* Calculate the number of blocks of data to be encrypted provided now, and
num_blocks = len / 16;
all_num_blocks = num_blocks + ctx->blocks_processed;
- /* Loop through all full blocks to be encrypted */
- for (i = ctx->blocks_processed + 1; i <= all_num_blocks; i++) {
- OCB_BLOCK *lookup;
- OCB_BLOCK *inblock;
- OCB_BLOCK *outblock;
+ if (num_blocks && all_num_blocks == (size_t)all_num_blocks
+ && ctx->stream != NULL) {
+ size_t max_idx = 0, top = (size_t)all_num_blocks;
- /* Offset_i = Offset_{i-1} xor L_{ntz(i)} */
- lookup = ocb_lookup_l(ctx, ocb_ntz(i));
- if (!lookup)
+ /*
+ * See how many L_{i} entries we need to process data at hand
+ * and pre-compute missing entries in the table [if any]...
+ */
+ while (top >>= 1)
+ max_idx++;
+ if (ocb_lookup_l(ctx, max_idx) == NULL)
return 0;
- ocb_block16_xor(&ctx->offset, lookup, &ctx->offset);
-
- /* C_i = Offset_i xor ENCIPHER(K, P_i xor Offset_i) */
- inblock = (OCB_BLOCK *)(in + ((i - ctx->blocks_processed - 1) * 16));
- ocb_block16_xor_misaligned(&ctx->offset, inblock, &tmp1);
- /* Checksum_i = Checksum_{i-1} xor P_i */
- ocb_block16_xor_misaligned(&ctx->checksum, inblock, &ctx->checksum);
- ocb_encrypt(ctx, &tmp1, &tmp2, ctx->keyenc);
- outblock =
- (OCB_BLOCK *)(out + ((i - ctx->blocks_processed - 1) * 16));
- ocb_block16_xor_misaligned(&ctx->offset, &tmp2, outblock);
+ ctx->stream(in, out, num_blocks, ctx->keyenc,
+ (size_t)ctx->blocks_processed + 1, ctx->offset.c,
+ (const unsigned char (*)[16])ctx->l, ctx->checksum.c);
+ } else {
+ /* Loop through all full blocks to be encrypted */
+ for (i = ctx->blocks_processed + 1; i <= all_num_blocks; i++) {
+ OCB_BLOCK *lookup;
+ OCB_BLOCK *inblock;
+ OCB_BLOCK *outblock;
+
+ /* Offset_i = Offset_{i-1} xor L_{ntz(i)} */
+ lookup = ocb_lookup_l(ctx, ocb_ntz(i));
+ if (lookup == NULL)
+ return 0;
+ ocb_block16_xor(&ctx->offset, lookup, &ctx->offset);
+
+ /* C_i = Offset_i xor ENCIPHER(K, P_i xor Offset_i) */
+ inblock =
+ (OCB_BLOCK *)(in + ((i - ctx->blocks_processed - 1) * 16));
+ ocb_block16_xor_misaligned(&ctx->offset, inblock, &tmp1);
+ /* Checksum_i = Checksum_{i-1} xor P_i */
+ ocb_block16_xor_misaligned(&ctx->checksum, inblock, &ctx->checksum);
+ ctx->encrypt(tmp1.c, tmp2.c, ctx->keyenc);
+ outblock =
+ (OCB_BLOCK *)(out + ((i - ctx->blocks_processed - 1) * 16));
+ ocb_block16_xor_misaligned(&ctx->offset, &tmp2, outblock);
+ }
}
/*
ocb_block16_xor(&ctx->offset, &ctx->l_star, &ctx->offset);
/* Pad = ENCIPHER(K, Offset_*) */
- ocb_encrypt(ctx, &ctx->offset, &pad, ctx->keyenc);
+ ctx->encrypt(ctx->offset.c, pad.c, ctx->keyenc);
/* C_* = P_* xor Pad[1..bitlen(P_*)] */
ocb_block_xor(in + (len / 16) * 16, (unsigned char *)&pad, last_len,
const unsigned char *in, unsigned char *out,
size_t len)
{
- u64 i;
- u64 all_num_blocks, num_blocks;
+ u64 i, all_num_blocks;
+ size_t num_blocks, last_len;
OCB_BLOCK tmp1;
OCB_BLOCK tmp2;
OCB_BLOCK pad;
- int last_len;
+
/*
* Calculate the number of blocks of data to be decrypted provided now, and
* so far
num_blocks = len / 16;
all_num_blocks = num_blocks + ctx->blocks_processed;
- /* Loop through all full blocks to be decrypted */
- for (i = ctx->blocks_processed + 1; i <= all_num_blocks; i++) {
- OCB_BLOCK *inblock;
- OCB_BLOCK *outblock;
+ if (num_blocks && all_num_blocks == (size_t)all_num_blocks
+ && ctx->stream != NULL) {
+ size_t max_idx = 0, top = (size_t)all_num_blocks;
- /* Offset_i = Offset_{i-1} xor L_{ntz(i)} */
- OCB_BLOCK *lookup = ocb_lookup_l(ctx, ocb_ntz(i));
- if (!lookup)
+ /*
+ * See how many L_{i} entries we need to process data at hand
+ * and pre-compute missing entries in the table [if any]...
+ */
+ while (top >>= 1)
+ max_idx++;
+ if (ocb_lookup_l(ctx, max_idx) == NULL)
return 0;
- ocb_block16_xor(&ctx->offset, lookup, &ctx->offset);
-
- /* P_i = Offset_i xor DECIPHER(K, C_i xor Offset_i) */
- inblock = (OCB_BLOCK *)(in + ((i - ctx->blocks_processed - 1) * 16));
- ocb_block16_xor_misaligned(&ctx->offset, inblock, &tmp1);
- ocb_decrypt(ctx, &tmp1, &tmp2, ctx->keydec);
- outblock =
- (OCB_BLOCK *)(out + ((i - ctx->blocks_processed - 1) * 16));
- ocb_block16_xor_misaligned(&ctx->offset, &tmp2, outblock);
-
- /* Checksum_i = Checksum_{i-1} xor P_i */
- ocb_block16_xor_misaligned(&ctx->checksum, outblock, &ctx->checksum);
+
+ ctx->stream(in, out, num_blocks, ctx->keydec,
+ (size_t)ctx->blocks_processed + 1, ctx->offset.c,
+ (const unsigned char (*)[16])ctx->l, ctx->checksum.c);
+ } else {
+ /* Loop through all full blocks to be decrypted */
+ for (i = ctx->blocks_processed + 1; i <= all_num_blocks; i++) {
+ OCB_BLOCK *inblock;
+ OCB_BLOCK *outblock;
+
+ /* Offset_i = Offset_{i-1} xor L_{ntz(i)} */
+ OCB_BLOCK *lookup = ocb_lookup_l(ctx, ocb_ntz(i));
+ if (lookup == NULL)
+ return 0;
+ ocb_block16_xor(&ctx->offset, lookup, &ctx->offset);
+
+ /* P_i = Offset_i xor DECIPHER(K, C_i xor Offset_i) */
+ inblock =
+ (OCB_BLOCK *)(in + ((i - ctx->blocks_processed - 1) * 16));
+ ocb_block16_xor_misaligned(&ctx->offset, inblock, &tmp1);
+ ctx->decrypt(tmp1.c, tmp2.c, ctx->keydec);
+ outblock =
+ (OCB_BLOCK *)(out + ((i - ctx->blocks_processed - 1) * 16));
+ ocb_block16_xor_misaligned(&ctx->offset, &tmp2, outblock);
+
+ /* Checksum_i = Checksum_{i-1} xor P_i */
+ ocb_block16_xor_misaligned(&ctx->checksum, outblock, &ctx->checksum);
+ }
}
/*
ocb_block16_xor(&ctx->offset, &ctx->l_star, &ctx->offset);
/* Pad = ENCIPHER(K, Offset_*) */
- ocb_encrypt(ctx, &ctx->offset, &pad, ctx->keyenc);
+ ctx->encrypt(ctx->offset.c, pad.c, ctx->keyenc);
/* P_* = C_* xor Pad[1..bitlen(C_*)] */
ocb_block_xor(in + (len / 16) * 16, (unsigned char *)&pad, last_len,
*/
ocb_block16_xor(&ctx->checksum, &ctx->offset, &tmp1);
ocb_block16_xor(&tmp1, &ctx->l_dollar, &tmp2);
- ocb_encrypt(ctx, &tmp2, &tmp1, ctx->keyenc);
+ ctx->encrypt(tmp2.c, tmp1.c, ctx->keyenc);
ocb_block16_xor(&tmp1, &ctx->sum, &ctx->tag);
if (len > 16 || len < 1) {
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