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Commit 7db20b14 authored by Niels Möller's avatar Niels Möller
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Reindent CMAC code to GNU standard, white space changes only.

parent a254a776
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Showing with 128 additions and 113 deletions
cmac.c
View file @ 7db20b14
......@@ -47,112 +47,124 @@
#include "macros.h"
static const uint8_t const_zero[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
/* shift one and XOR with 0x87. */
static inline void block_mulx(union nettle_block16 *dst,
const union nettle_block16 *src)
static inline void
block_mulx(union nettle_block16 *dst,
const union nettle_block16 *src)
{
uint64_t b1 = READ_UINT64(src->b);
uint64_t b2 = READ_UINT64(src->b+8);
uint64_t b1 = READ_UINT64(src->b);
uint64_t b2 = READ_UINT64(src->b+8);
b1 = (b1 << 1) | (b2 >> 63);
b2 <<= 1;
b1 = (b1 << 1) | (b2 >> 63);
b2 <<= 1;
if (src->b[0] & 0x80)
b2 ^= 0x87;
if (src->b[0] & 0x80)
b2 ^= 0x87;
WRITE_UINT64(dst->b, b1);
WRITE_UINT64(dst->b+8, b2);
WRITE_UINT64(dst->b, b1);
WRITE_UINT64(dst->b+8, b2);
}
void cmac128_set_key(struct cmac128 *ctx, void *cipher,
nettle_cipher_func *encrypt)
void
cmac128_set_key(struct cmac128 *ctx, void *cipher,
nettle_cipher_func *encrypt)
{
union nettle_block16 *L = &ctx->block;
memset(ctx, 0, sizeof(*ctx));
union nettle_block16 *L = &ctx->block;
memset(ctx, 0, sizeof(*ctx));
/* step 1 - generate subkeys k1 and k2 */
encrypt(cipher, 16, L->b, const_zero);
/* step 1 - generate subkeys k1 and k2 */
encrypt(cipher, 16, L->b, const_zero);
block_mulx(&ctx->K1, L);
block_mulx(&ctx->K2, &ctx->K1);
block_mulx(&ctx->K1, L);
block_mulx(&ctx->K2, &ctx->K1);
}
#define MIN(x,y) ((x)<(y)?(x):(y))
void cmac128_update(struct cmac128 *ctx, void *cipher,
nettle_cipher_func *encrypt,
size_t msg_len, const uint8_t *msg)
void
cmac128_update(struct cmac128 *ctx, void *cipher,
nettle_cipher_func *encrypt,
size_t msg_len, const uint8_t *msg)
{
union nettle_block16 Y;
/*
* check if we expand the block
*/
if (ctx->index < 16) {
size_t len = MIN(16 - ctx->index, msg_len);
memcpy(&ctx->block.b[ctx->index], msg, len);
msg += len;
msg_len -= len;
ctx->index += len;
}
if (msg_len == 0) {
/* if it is still the last block, we are done */
return;
}
/*
* now checksum everything but the last block
*/
memxor3(Y.b, ctx->X.b, ctx->block.b, 16);
encrypt(cipher, 16, ctx->X.b, Y.b);
while (msg_len > 16) {
memxor3(Y.b, ctx->X.b, msg, 16);
encrypt(cipher, 16, ctx->X.b, Y.b);
msg += 16;
msg_len -= 16;
}
/*
* copy the last block, it will be processed in
* cmac128_digest().
*/
memcpy(ctx->block.b, msg, msg_len);
ctx->index = msg_len;
union nettle_block16 Y;
/*
* check if we expand the block
*/
if (ctx->index < 16)
{
size_t len = MIN(16 - ctx->index, msg_len);
memcpy(&ctx->block.b[ctx->index], msg, len);
msg += len;
msg_len -= len;
ctx->index += len;
}
if (msg_len == 0) {
/* if it is still the last block, we are done */
return;
}
/*
* now checksum everything but the last block
*/
memxor3(Y.b, ctx->X.b, ctx->block.b, 16);
encrypt(cipher, 16, ctx->X.b, Y.b);
while (msg_len > 16)
{
memxor3(Y.b, ctx->X.b, msg, 16);
encrypt(cipher, 16, ctx->X.b, Y.b);
msg += 16;
msg_len -= 16;
}
/*
* copy the last block, it will be processed in
* cmac128_digest().
*/
memcpy(ctx->block.b, msg, msg_len);
ctx->index = msg_len;
}
void cmac128_digest(struct cmac128 *ctx, void *cipher,
nettle_cipher_func *encrypt,
unsigned length,
uint8_t *dst)
void
cmac128_digest(struct cmac128 *ctx, void *cipher,
nettle_cipher_func *encrypt,
unsigned length,
uint8_t *dst)
{
union nettle_block16 Y;
memset(ctx->block.b+ctx->index, 0, sizeof(ctx->block.b)-ctx->index);
/* re-use ctx->block for memxor output */
if (ctx->index < 16) {
ctx->block.b[ctx->index] = 0x80;
memxor(ctx->block.b, ctx->K2.b, 16);
} else {
memxor(ctx->block.b, ctx->K1.b, 16);
}
memxor3(Y.b, ctx->block.b, ctx->X.b, 16);
assert(length <= 16);
if (length == 16) {
encrypt(cipher, 16, dst, Y.b);
} else {
encrypt(cipher, 16, ctx->block.b, Y.b);
memcpy(dst, ctx->block.b, length);
}
/* reset state for re-use */
memset(&ctx->X, 0, sizeof(ctx->X));
ctx->index = 0;
union nettle_block16 Y;
memset(ctx->block.b+ctx->index, 0, sizeof(ctx->block.b)-ctx->index);
/* re-use ctx->block for memxor output */
if (ctx->index < 16)
{
ctx->block.b[ctx->index] = 0x80;
memxor(ctx->block.b, ctx->K2.b, 16);
}
else
{
memxor(ctx->block.b, ctx->K1.b, 16);
}
memxor3(Y.b, ctx->block.b, ctx->X.b, 16);
assert(length <= 16);
if (length == 16)
{
encrypt(cipher, 16, dst, Y.b);
}
else
{
encrypt(cipher, 16, ctx->block.b, Y.b);
memcpy(dst, ctx->block.b, length);
}
/* reset state for re-use */
memset(&ctx->X, 0, sizeof(ctx->X));
ctx->index = 0;
}
cmac.h
View file @ 7db20b14
......@@ -55,49 +55,53 @@ extern "C" {
#define cmac_aes256_update nettle_cmac_aes256_update
#define cmac_aes256_digest nettle_cmac_aes256_digest
struct cmac128 {
union nettle_block16 K1;
union nettle_block16 K2;
struct cmac128
{
union nettle_block16 K1;
union nettle_block16 K2;
union nettle_block16 X;
union nettle_block16 X;
union nettle_block16 block;
size_t index;
union nettle_block16 block;
size_t index;
};
void cmac128_set_key(struct cmac128 *ctx, void *cipher,
nettle_cipher_func *encrypt);
void cmac128_update(struct cmac128 *ctx, void *cipher,
nettle_cipher_func *encrypt,
size_t msg_len, const uint8_t *msg);
void cmac128_digest(struct cmac128 *ctx, void *cipher,
nettle_cipher_func *encrypt,
unsigned length,
uint8_t *out);
void
cmac128_set_key(struct cmac128 *ctx, void *cipher,
nettle_cipher_func *encrypt);
void
cmac128_update(struct cmac128 *ctx, void *cipher,
nettle_cipher_func *encrypt,
size_t msg_len, const uint8_t *msg);
void
cmac128_digest(struct cmac128 *ctx, void *cipher,
nettle_cipher_func *encrypt,
unsigned length,
uint8_t *out);
#define CMAC128_CTX(type) \
{ struct cmac128 data; type cipher; }
/* NOTE: Avoid using NULL, as we don't include anything defining it. */
#define CMAC128_SET_KEY(ctx, set_key, encrypt, cmac_key) \
#define CMAC128_SET_KEY(ctx, set_key, encrypt, cmac_key) \
do { \
(set_key)(&(ctx)->cipher, (cmac_key)); \
if (0) (encrypt)(&(ctx)->cipher, ~(size_t) 0, \
(uint8_t *) 0, (const uint8_t *) 0); \
cmac128_set_key(&(ctx)->data, &(ctx)->cipher, \
cmac128_set_key(&(ctx)->data, &(ctx)->cipher, \
(nettle_cipher_func *) (encrypt)); \
} while (0)
#define CMAC128_UPDATE(ctx, encrypt, length, src) \
cmac128_update(&(ctx)->data, &(ctx)->cipher, \
#define CMAC128_UPDATE(ctx, encrypt, length, src) \
cmac128_update(&(ctx)->data, &(ctx)->cipher, \
(nettle_cipher_func *)encrypt, (length), (src))
#define CMAC128_DIGEST(ctx, encrypt, length, digest) \
(0 ? (encrypt)(&(ctx)->cipher, ~(size_t) 0, \
(uint8_t *) 0, (const uint8_t *) 0) \
: cmac128_digest(&(ctx)->data, &(ctx)->cipher, \
(nettle_cipher_func *) (encrypt), \
#define CMAC128_DIGEST(ctx, encrypt, length, digest) \
(0 ? (encrypt)(&(ctx)->cipher, ~(size_t) 0, \
(uint8_t *) 0, (const uint8_t *) 0) \
: cmac128_digest(&(ctx)->data, &(ctx)->cipher, \
(nettle_cipher_func *) (encrypt), \
(length), (digest)))
struct cmac_aes128_ctx CMAC128_CTX(struct aes128_ctx);
......
testsuite/cmac-test.c
View file @ 7db20b14
......@@ -143,4 +143,3 @@ test_main(void)
SHEX("e1992190549f6ed5696a2c056c315410"));
}
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