[openssl-commits] [openssl] OpenSSL_1_1_0-stable update
Andy Polyakov
appro at openssl.org
Sat May 27 12:06:56 UTC 2017
The branch OpenSSL_1_1_0-stable has been updated
via ab6abae63c701d6d3a5760d881b9bee235620e4b (commit)
from 523ea2721581cf9eaa20036327b53b36ba2135ba (commit)
- Log -----------------------------------------------------------------
commit ab6abae63c701d6d3a5760d881b9bee235620e4b
Author: Andy Polyakov <appro at openssl.org>
Date: Thu May 25 18:08:09 2017 +0200
modes/ocb128.c: address undefined behaviour warning.
Reviewed-by: Rich Salz <rsalz at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3526)
(cherry picked from commit 14bb100b6cc4c875473af6659c8368198e898050)
-----------------------------------------------------------------------
Summary of changes:
crypto/modes/ocb128.c | 116 +++++++++++++++++++++++++-------------------------
1 file changed, 58 insertions(+), 58 deletions(-)
diff --git a/crypto/modes/ocb128.c b/crypto/modes/ocb128.c
index f6f8da7..db794d0 100644
--- a/crypto/modes/ocb128.c
+++ b/crypto/modes/ocb128.c
@@ -274,8 +274,7 @@ int CRYPTO_ocb128_aad(OCB128_CONTEXT *ctx, const unsigned char *aad,
{
u64 i, all_num_blocks;
size_t num_blocks, last_len;
- OCB_BLOCK tmp1;
- OCB_BLOCK tmp2;
+ OCB_BLOCK tmp;
/* Calculate the number of blocks of AAD provided now, and so far */
num_blocks = len / 16;
@@ -284,7 +283,6 @@ int CRYPTO_ocb128_aad(OCB128_CONTEXT *ctx, const unsigned char *aad,
/* Loop through all full blocks of AAD */
for (i = ctx->blocks_hashed + 1; i <= all_num_blocks; i++) {
OCB_BLOCK *lookup;
- OCB_BLOCK *aad_block;
/* Offset_i = Offset_{i-1} xor L_{ntz(i)} */
lookup = ocb_lookup_l(ctx, ocb_ntz(i));
@@ -292,11 +290,13 @@ int CRYPTO_ocb128_aad(OCB128_CONTEXT *ctx, const unsigned char *aad,
return 0;
ocb_block16_xor(&ctx->offset_aad, lookup, &ctx->offset_aad);
+ memcpy(tmp.c, aad, 16);
+ aad += 16;
+
/* 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_misaligned(&ctx->offset_aad, aad_block, &tmp1);
- ctx->encrypt(tmp1.c, tmp2.c, ctx->keyenc);
- ocb_block16_xor(&ctx->sum, &tmp2, &ctx->sum);
+ ocb_block16_xor(&ctx->offset_aad, &tmp, &tmp);
+ ctx->encrypt(tmp.c, tmp.c, ctx->keyenc);
+ ocb_block16_xor(&tmp, &ctx->sum, &ctx->sum);
}
/*
@@ -310,14 +310,14 @@ int CRYPTO_ocb128_aad(OCB128_CONTEXT *ctx, const unsigned char *aad,
ocb_block16_xor(&ctx->offset_aad, &ctx->l_star, &ctx->offset_aad);
/* CipherInput = (A_* || 1 || zeros(127-bitlen(A_*))) xor Offset_* */
- memset(&tmp1, 0, 16);
- memcpy(&tmp1, aad + (num_blocks * 16), last_len);
- ((unsigned char *)&tmp1)[last_len] = 0x80;
- ocb_block16_xor(&ctx->offset_aad, &tmp1, &tmp2);
+ memset(tmp.c, 0, 16);
+ memcpy(tmp.c, aad, last_len);
+ tmp.c[last_len] = 0x80;
+ ocb_block16_xor(&ctx->offset_aad, &tmp, &tmp);
/* Sum = Sum_m xor ENCIPHER(K, CipherInput) */
- ctx->encrypt(tmp2.c, tmp1.c, ctx->keyenc);
- ocb_block16_xor(&ctx->sum, &tmp1, &ctx->sum);
+ ctx->encrypt(tmp.c, tmp.c, ctx->keyenc);
+ ocb_block16_xor(&tmp, &ctx->sum, &ctx->sum);
}
ctx->blocks_hashed = all_num_blocks;
@@ -335,9 +335,6 @@ int CRYPTO_ocb128_encrypt(OCB128_CONTEXT *ctx,
{
u64 i, all_num_blocks;
size_t num_blocks, last_len;
- OCB_BLOCK tmp1;
- OCB_BLOCK tmp2;
- OCB_BLOCK pad;
/*
* Calculate the number of blocks of data to be encrypted provided now, and
@@ -366,8 +363,7 @@ int CRYPTO_ocb128_encrypt(OCB128_CONTEXT *ctx,
/* 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;
+ OCB_BLOCK tmp;
/* Offset_i = Offset_{i-1} xor L_{ntz(i)} */
lookup = ocb_lookup_l(ctx, ocb_ntz(i));
@@ -375,16 +371,19 @@ int CRYPTO_ocb128_encrypt(OCB128_CONTEXT *ctx,
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);
+ memcpy(tmp.c, in, 16);
+ in += 16;
+
/* 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(&tmp, &ctx->checksum, &ctx->checksum);
+
+ /* C_i = Offset_i xor ENCIPHER(K, P_i xor Offset_i) */
+ ocb_block16_xor(&ctx->offset, &tmp, &tmp);
+ ctx->encrypt(tmp.c, tmp.c, ctx->keyenc);
+ ocb_block16_xor(&ctx->offset, &tmp, &tmp);
+
+ memcpy(out, tmp.c, 16);
+ out += 16;
}
}
@@ -395,6 +394,8 @@ int CRYPTO_ocb128_encrypt(OCB128_CONTEXT *ctx,
last_len = len % 16;
if (last_len > 0) {
+ OCB_BLOCK pad;
+
/* Offset_* = Offset_m xor L_* */
ocb_block16_xor(&ctx->offset, &ctx->l_star, &ctx->offset);
@@ -402,14 +403,13 @@ int CRYPTO_ocb128_encrypt(OCB128_CONTEXT *ctx,
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,
- out + (num_blocks * 16));
+ ocb_block_xor(in, pad.c, last_len, out);
/* Checksum_* = Checksum_m xor (P_* || 1 || zeros(127-bitlen(P_*))) */
- memset(&tmp1, 0, 16);
- memcpy(&tmp1, in + (len / 16) * 16, last_len);
- ((unsigned char *)(&tmp1))[last_len] = 0x80;
- ocb_block16_xor(&ctx->checksum, &tmp1, &ctx->checksum);
+ 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);
}
ctx->blocks_processed = all_num_blocks;
@@ -427,9 +427,6 @@ int CRYPTO_ocb128_decrypt(OCB128_CONTEXT *ctx,
{
u64 i, all_num_blocks;
size_t num_blocks, last_len;
- OCB_BLOCK tmp1;
- OCB_BLOCK tmp2;
- OCB_BLOCK pad;
/*
* Calculate the number of blocks of data to be decrypted provided now, and
@@ -455,10 +452,10 @@ int CRYPTO_ocb128_decrypt(OCB128_CONTEXT *ctx,
(size_t)ctx->blocks_processed + 1, ctx->offset.c,
(const unsigned char (*)[16])ctx->l, ctx->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++) {
- 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));
@@ -466,17 +463,19 @@ int CRYPTO_ocb128_decrypt(OCB128_CONTEXT *ctx,
return 0;
ocb_block16_xor(&ctx->offset, lookup, &ctx->offset);
+ memcpy(tmp.c, in, 16);
+ in += 16;
+
/* 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);
+ ocb_block16_xor(&ctx->offset, &tmp, &tmp);
+ ctx->decrypt(tmp.c, tmp.c, ctx->keydec);
+ ocb_block16_xor(&ctx->offset, &tmp, &tmp);
/* Checksum_i = Checksum_{i-1} xor P_i */
- ocb_block16_xor_misaligned(&ctx->checksum, outblock, &ctx->checksum);
+ ocb_block16_xor(&tmp, &ctx->checksum, &ctx->checksum);
+
+ memcpy(out, tmp.c, 16);
+ out += 16;
}
}
@@ -487,6 +486,8 @@ int CRYPTO_ocb128_decrypt(OCB128_CONTEXT *ctx,
last_len = len % 16;
if (last_len > 0) {
+ OCB_BLOCK pad;
+
/* Offset_* = Offset_m xor L_* */
ocb_block16_xor(&ctx->offset, &ctx->l_star, &ctx->offset);
@@ -494,14 +495,13 @@ int CRYPTO_ocb128_decrypt(OCB128_CONTEXT *ctx,
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,
- out + (num_blocks * 16));
+ ocb_block_xor(in, pad.c, last_len, out);
/* Checksum_* = Checksum_m xor (P_* || 1 || zeros(127-bitlen(P_*))) */
- memset(&tmp1, 0, 16);
- memcpy(&tmp1, out + (len / 16) * 16, last_len);
- ((unsigned char *)(&tmp1))[last_len] = 0x80;
- ocb_block16_xor(&ctx->checksum, &tmp1, &ctx->checksum);
+ 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);
}
ctx->blocks_processed = all_num_blocks;
@@ -515,15 +515,15 @@ int CRYPTO_ocb128_decrypt(OCB128_CONTEXT *ctx,
int CRYPTO_ocb128_finish(OCB128_CONTEXT *ctx, const unsigned char *tag,
size_t len)
{
- OCB_BLOCK tmp1, tmp2;
+ OCB_BLOCK tmp;
/*
* Tag = ENCIPHER(K, Checksum_* xor Offset_* xor L_$) xor HASH(K,A)
*/
- ocb_block16_xor(&ctx->checksum, &ctx->offset, &tmp1);
- ocb_block16_xor(&tmp1, &ctx->l_dollar, &tmp2);
- ctx->encrypt(tmp2.c, tmp1.c, ctx->keyenc);
- ocb_block16_xor(&tmp1, &ctx->sum, &ctx->tag);
+ ocb_block16_xor(&ctx->checksum, &ctx->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);
if (len > 16 || len < 1) {
return -1;
@@ -549,7 +549,7 @@ int CRYPTO_ocb128_tag(OCB128_CONTEXT *ctx, unsigned char *tag, size_t len)
CRYPTO_ocb128_finish(ctx, NULL, 0);
/* Copy the tag into the supplied buffer */
- memcpy(tag, &ctx->tag, len);
+ memcpy(tag, ctx->tag.c, len);
return 1;
}
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