/*
* Copyright 2014-2018 The OpenSSL Project Authors. All Rights Reserved.
*
- * Licensed under the OpenSSL license (the "License"). You may not use
+ * 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
#include <string.h>
#include <openssl/crypto.h>
#include <openssl/err.h>
-#include "modes_lcl.h"
+#include "internal/modes_int.h"
#ifndef OPENSSL_NO_OCB
static void ocb_block_lshift(const unsigned char *in, size_t shift,
unsigned char *out)
{
- unsigned char shift_mask;
int i;
- unsigned char mask[15];
+ unsigned char carry = 0, carry_next;
- shift_mask = 0xff;
- shift_mask <<= (8 - shift);
for (i = 15; i >= 0; i--) {
- if (i > 0) {
- mask[i - 1] = in[i] & shift_mask;
- mask[i - 1] >>= 8 - shift;
- }
- out[i] = in[i] << shift;
-
- if (i != 15) {
- out[i] ^= mask[i];
- }
+ carry_next = in[i] >> (8 - shift);
+ out[i] = (in[i] << shift) | carry;
+ carry = carry_next;
}
}
*/
mask = in->c[0] & 0x80;
mask >>= 7;
- mask *= 135;
+ mask = (0 - mask) & 0x87;
ocb_block_lshift(in->c, 1, out->c);
* the index.
*/
ctx->max_l_index += (idx - ctx->max_l_index + 4) & ~3;
- tmp_ptr =
- OPENSSL_realloc(ctx->l, ctx->max_l_index * sizeof(OCB_BLOCK));
+ tmp_ptr = OPENSSL_realloc(ctx->l, ctx->max_l_index * sizeof(OCB_BLOCK));
if (tmp_ptr == NULL) /* prevent ctx->l from being clobbered */
return NULL;
ctx->l = tmp_ptr;
return -1;
}
+ /* Reset nonce-dependent variables */
+ memset(&ctx->sess, 0, sizeof(ctx->sess));
+
/* Nonce = num2str(TAGLEN mod 128,7) || zeros(120-bitlen(N)) || 1 || N */
nonce[0] = ((taglen * 8) % 128) << 1;
memset(nonce + 1, 0, 15);
/* Offset_0 = Stretch[1+bottom..128+bottom] */
shift = bottom % 8;
- ocb_block_lshift(stretch + (bottom / 8), shift, ctx->offset.c);
+ ocb_block_lshift(stretch + (bottom / 8), shift, ctx->sess.offset.c);
mask = 0xff;
mask <<= 8 - shift;
- ctx->offset.c[15] |=
+ ctx->sess.offset.c[15] |=
(*(stretch + (bottom / 8) + 16) & mask) >> (8 - shift);
return 1;
/* Calculate the number of blocks of AAD provided now, and so far */
num_blocks = len / 16;
- all_num_blocks = num_blocks + ctx->blocks_hashed;
+ all_num_blocks = num_blocks + ctx->sess.blocks_hashed;
/* Loop through all full blocks of AAD */
- for (i = ctx->blocks_hashed + 1; i <= all_num_blocks; i++) {
+ for (i = ctx->sess.blocks_hashed + 1; i <= all_num_blocks; i++) {
OCB_BLOCK *lookup;
/* 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_aad, lookup, &ctx->offset_aad);
+ ocb_block16_xor(&ctx->sess.offset_aad, lookup, &ctx->sess.offset_aad);
memcpy(tmp.c, aad, 16);
aad += 16;
/* Sum_i = Sum_{i-1} xor ENCIPHER(K, A_i xor Offset_i) */
- ocb_block16_xor(&ctx->offset_aad, &tmp, &tmp);
+ ocb_block16_xor(&ctx->sess.offset_aad, &tmp, &tmp);
ctx->encrypt(tmp.c, tmp.c, ctx->keyenc);
- ocb_block16_xor(&tmp, &ctx->sum, &ctx->sum);
+ ocb_block16_xor(&tmp, &ctx->sess.sum, &ctx->sess.sum);
}
/*
if (last_len > 0) {
/* Offset_* = Offset_m xor L_* */
- ocb_block16_xor(&ctx->offset_aad, &ctx->l_star, &ctx->offset_aad);
+ ocb_block16_xor(&ctx->sess.offset_aad, &ctx->l_star,
+ &ctx->sess.offset_aad);
/* CipherInput = (A_* || 1 || zeros(127-bitlen(A_*))) xor Offset_* */
memset(tmp.c, 0, 16);
memcpy(tmp.c, aad, last_len);
tmp.c[last_len] = 0x80;
- ocb_block16_xor(&ctx->offset_aad, &tmp, &tmp);
+ ocb_block16_xor(&ctx->sess.offset_aad, &tmp, &tmp);
/* Sum = Sum_m xor ENCIPHER(K, CipherInput) */
ctx->encrypt(tmp.c, tmp.c, ctx->keyenc);
- ocb_block16_xor(&tmp, &ctx->sum, &ctx->sum);
+ ocb_block16_xor(&tmp, &ctx->sess.sum, &ctx->sess.sum);
}
- ctx->blocks_hashed = all_num_blocks;
+ ctx->sess.blocks_hashed = all_num_blocks;
return 1;
}
* so far
*/
num_blocks = len / 16;
- all_num_blocks = num_blocks + ctx->blocks_processed;
+ all_num_blocks = num_blocks + ctx->sess.blocks_processed;
if (num_blocks && all_num_blocks == (size_t)all_num_blocks
&& ctx->stream != NULL) {
return 0;
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);
+ (size_t)ctx->sess.blocks_processed + 1, ctx->sess.offset.c,
+ (const unsigned char (*)[16])ctx->l, ctx->sess.checksum.c);
} else {
/* Loop through all full blocks to be encrypted */
- for (i = ctx->blocks_processed + 1; i <= all_num_blocks; i++) {
+ for (i = ctx->sess.blocks_processed + 1; i <= all_num_blocks; i++) {
OCB_BLOCK *lookup;
OCB_BLOCK tmp;
lookup = ocb_lookup_l(ctx, ocb_ntz(i));
if (lookup == NULL)
return 0;
- ocb_block16_xor(&ctx->offset, lookup, &ctx->offset);
+ ocb_block16_xor(&ctx->sess.offset, lookup, &ctx->sess.offset);
memcpy(tmp.c, in, 16);
in += 16;
/* Checksum_i = Checksum_{i-1} xor P_i */
- ocb_block16_xor(&tmp, &ctx->checksum, &ctx->checksum);
+ ocb_block16_xor(&tmp, &ctx->sess.checksum, &ctx->sess.checksum);
/* C_i = Offset_i xor ENCIPHER(K, P_i xor Offset_i) */
- ocb_block16_xor(&ctx->offset, &tmp, &tmp);
+ ocb_block16_xor(&ctx->sess.offset, &tmp, &tmp);
ctx->encrypt(tmp.c, tmp.c, ctx->keyenc);
- ocb_block16_xor(&ctx->offset, &tmp, &tmp);
+ ocb_block16_xor(&ctx->sess.offset, &tmp, &tmp);
memcpy(out, tmp.c, 16);
out += 16;
OCB_BLOCK pad;
/* Offset_* = Offset_m xor L_* */
- ocb_block16_xor(&ctx->offset, &ctx->l_star, &ctx->offset);
+ ocb_block16_xor(&ctx->sess.offset, &ctx->l_star, &ctx->sess.offset);
/* Pad = ENCIPHER(K, Offset_*) */
- ctx->encrypt(ctx->offset.c, pad.c, ctx->keyenc);
+ ctx->encrypt(ctx->sess.offset.c, pad.c, ctx->keyenc);
/* C_* = P_* xor Pad[1..bitlen(P_*)] */
ocb_block_xor(in, pad.c, last_len, out);
memset(pad.c, 0, 16); /* borrow pad */
memcpy(pad.c, in, last_len);
pad.c[last_len] = 0x80;
- ocb_block16_xor(&pad, &ctx->checksum, &ctx->checksum);
+ ocb_block16_xor(&pad, &ctx->sess.checksum, &ctx->sess.checksum);
}
- ctx->blocks_processed = all_num_blocks;
+ ctx->sess.blocks_processed = all_num_blocks;
return 1;
}
* so far
*/
num_blocks = len / 16;
- all_num_blocks = num_blocks + ctx->blocks_processed;
+ all_num_blocks = num_blocks + ctx->sess.blocks_processed;
if (num_blocks && all_num_blocks == (size_t)all_num_blocks
&& ctx->stream != NULL) {
return 0;
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);
+ (size_t)ctx->sess.blocks_processed + 1, ctx->sess.offset.c,
+ (const unsigned char (*)[16])ctx->l, ctx->sess.checksum.c);
} else {
OCB_BLOCK tmp;
/* Loop through all full blocks to be decrypted */
- for (i = ctx->blocks_processed + 1; i <= all_num_blocks; i++) {
+ for (i = ctx->sess.blocks_processed + 1; i <= all_num_blocks; i++) {
/* 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);
+ ocb_block16_xor(&ctx->sess.offset, lookup, &ctx->sess.offset);
memcpy(tmp.c, in, 16);
in += 16;
/* P_i = Offset_i xor DECIPHER(K, C_i xor Offset_i) */
- ocb_block16_xor(&ctx->offset, &tmp, &tmp);
+ ocb_block16_xor(&ctx->sess.offset, &tmp, &tmp);
ctx->decrypt(tmp.c, tmp.c, ctx->keydec);
- ocb_block16_xor(&ctx->offset, &tmp, &tmp);
+ ocb_block16_xor(&ctx->sess.offset, &tmp, &tmp);
/* Checksum_i = Checksum_{i-1} xor P_i */
- ocb_block16_xor(&tmp, &ctx->checksum, &ctx->checksum);
+ ocb_block16_xor(&tmp, &ctx->sess.checksum, &ctx->sess.checksum);
memcpy(out, tmp.c, 16);
out += 16;
OCB_BLOCK pad;
/* Offset_* = Offset_m xor L_* */
- ocb_block16_xor(&ctx->offset, &ctx->l_star, &ctx->offset);
+ ocb_block16_xor(&ctx->sess.offset, &ctx->l_star, &ctx->sess.offset);
/* Pad = ENCIPHER(K, Offset_*) */
- ctx->encrypt(ctx->offset.c, pad.c, ctx->keyenc);
+ ctx->encrypt(ctx->sess.offset.c, pad.c, ctx->keyenc);
/* P_* = C_* xor Pad[1..bitlen(C_*)] */
ocb_block_xor(in, pad.c, last_len, out);
memset(pad.c, 0, 16); /* borrow pad */
memcpy(pad.c, out, last_len);
pad.c[last_len] = 0x80;
- ocb_block16_xor(&pad, &ctx->checksum, &ctx->checksum);
+ ocb_block16_xor(&pad, &ctx->sess.checksum, &ctx->sess.checksum);
}
- ctx->blocks_processed = all_num_blocks;
+ ctx->sess.blocks_processed = all_num_blocks;
return 1;
}
-/*
- * Calculate the tag and verify it against the supplied tag
- */
-int CRYPTO_ocb128_finish(OCB128_CONTEXT *ctx, const unsigned char *tag,
- size_t len)
+static int ocb_finish(OCB128_CONTEXT *ctx, unsigned char *tag, size_t len,
+ int write)
{
OCB_BLOCK tmp;
+ if (len > 16 || len < 1) {
+ return -1;
+ }
+
/*
* Tag = ENCIPHER(K, Checksum_* xor Offset_* xor L_$) xor HASH(K,A)
*/
- ocb_block16_xor(&ctx->checksum, &ctx->offset, &tmp);
+ ocb_block16_xor(&ctx->sess.checksum, &ctx->sess.offset, &tmp);
ocb_block16_xor(&ctx->l_dollar, &tmp, &tmp);
ctx->encrypt(tmp.c, tmp.c, ctx->keyenc);
- ocb_block16_xor(&tmp, &ctx->sum, &ctx->tag);
+ ocb_block16_xor(&tmp, &ctx->sess.sum, &tmp);
- if (len > 16 || len < 1) {
- return -1;
+ if (write) {
+ memcpy(tag, &tmp, len);
+ return 1;
+ } else {
+ return CRYPTO_memcmp(&tmp, tag, len);
}
+}
- /* Compare the tag if we've been given one */
- if (tag)
- return CRYPTO_memcmp(&ctx->tag, tag, len);
- else
- return -1;
+/*
+ * Calculate the tag and verify it against the supplied tag
+ */
+int CRYPTO_ocb128_finish(OCB128_CONTEXT *ctx, const unsigned char *tag,
+ size_t len)
+{
+ return ocb_finish(ctx, (unsigned char*)tag, len, 0);
}
/*
*/
int CRYPTO_ocb128_tag(OCB128_CONTEXT *ctx, unsigned char *tag, size_t len)
{
- if (len > 16 || len < 1) {
- return -1;
- }
-
- /* Calculate the tag */
- CRYPTO_ocb128_finish(ctx, NULL, 0);
-
- /* Copy the tag into the supplied buffer */
- memcpy(tag, ctx->tag.c, len);
-
- return 1;
+ return ocb_finish(ctx, tag, len, 1);
}
/*
projects / openssl.git / blobdiff