#endif
#define CMAC128_DIGEST_SIZE 16
+#define CMAC64_DIGEST_SIZE 8
#define cmac128_set_key nettle_cmac128_set_key
#define cmac128_init nettle_cmac128_init
#define cmac_aes256_update nettle_cmac_aes256_update
#define cmac_aes256_digest nettle_cmac_aes256_digest
+#define cmac64_set_key nettle_cmac64_set_key
+#define cmac64_init nettle_cmac64_init
+#define cmac64_update nettle_cmac64_update
+#define cmac64_digest nettle_cmac64_digest
+
struct cmac128_key
{
union nettle_block16 K1;
size_t index;
};
+struct cmac64_key
+{
+ union nettle_block8 K1;
+ union nettle_block8 K2;
+};
+
+struct cmac64_ctx
+{
+ /* MAC state */
+ union nettle_block8 X;
+
+ /* Block buffer */
+ union nettle_block8 block;
+ size_t index;
+};
+
void
cmac128_set_key(struct cmac128_key *key, const void *cipher,
nettle_cipher_func *encrypt);
(nettle_cipher_func *) (encrypt), \
(length), (digest)))
+void
+cmac64_set_key(struct cmac64_key *key, const void *cipher,
+ nettle_cipher_func *encrypt);
+
+void
+cmac64_init(struct cmac64_ctx *ctx);
+
+void
+cmac64_update(struct cmac64_ctx *ctx, const void *cipher,
+ nettle_cipher_func *encrypt,
+ size_t msg_len, const uint8_t *msg);
+
+void
+cmac64_digest(struct cmac64_ctx *ctx, const struct cmac64_key *key,
+ const void *cipher, nettle_cipher_func *encrypt,
+ unsigned length, uint8_t *digest);
+
+
+#define CMAC64_CTX(type) \
+ { struct cmac64_key key; struct cmac64_ctx ctx; type cipher; }
+
+/* NOTE: Avoid using NULL, as we don't include anything defining it. */
+#define CMAC64_SET_KEY(self, set_key, encrypt, cmac_key) \
+ do { \
+ (set_key)(&(self)->cipher, (cmac_key)); \
+ if (0) (encrypt)(&(self)->cipher, ~(size_t) 0, \
+ (uint8_t *) 0, (const uint8_t *) 0); \
+ cmac64_set_key(&(self)->key, &(self)->cipher, \
+ (nettle_cipher_func *) (encrypt)); \
+ cmac64_init(&(self)->ctx); \
+ } while (0)
+
+#define CMAC64_UPDATE(self, encrypt, length, src) \
+ (0 ? (encrypt)(&(self)->cipher, ~(size_t) 0, \
+ (uint8_t *) 0, (const uint8_t *) 0) \
+ : cmac64_update(&(self)->ctx, &(self)->cipher, \
+ (nettle_cipher_func *)encrypt, \
+ (length), (src)))
+
+#define CMAC64_DIGEST(self, encrypt, length, digest) \
+ (0 ? (encrypt)(&(self)->cipher, ~(size_t) 0, \
+ (uint8_t *) 0, (const uint8_t *) 0) \
+ : cmac64_digest(&(self)->ctx, &(self)->key, \
+ &(self)->cipher, \
+ (nettle_cipher_func *) (encrypt), \
+ (length), (digest)))
+
struct cmac_aes128_ctx CMAC128_CTX(struct aes128_ctx);
void
--- /dev/null
+/*
+ AES-CMAC-128 (rfc 4493) / CMAC-64
+ Copyright (C) Stefan Metzmacher 2012
+ Copyright (C) Jeremy Allison 2012
+ Copyright (C) Michael Adam 2012
+ Copyright (C) 2017, Red Hat Inc.
+ Copyright (C) 2019, Dmitry Eremin-Solenikov
+
+ This file is part of GNU Nettle.
+
+ GNU Nettle is free software: you can redistribute it and/or
+ modify it under the terms of either:
+
+ * the GNU Lesser General Public License as published by the Free
+ Software Foundation; either version 3 of the License, or (at your
+ option) any later version.
+
+ or
+
+ * the GNU General Public License as published by the Free
+ Software Foundation; either version 2 of the License, or (at your
+ option) any later version.
+
+ or both in parallel, as here.
+
+ GNU Nettle is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received copies of the GNU General Public License and
+ the GNU Lesser General Public License along with this program. If
+ not, see http://www.gnu.org/licenses/.
+*/
+
+#if HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "cmac.h"
+
+#include "memxor.h"
+#include "nettle-internal.h"
+#include "macros.h"
+
+/* shift one and XOR with 0x87. */
+#if WORDS_BIGENDIAN
+static void
+_cmac64_block_mulx(union nettle_block8 *dst,
+ const union nettle_block8 *src)
+{
+ uint64_t carry = src->u64 >> 63;
+
+ dst->u64 = (src->u64 << 1) ^ (0x1b & -carry);
+}
+#else /* !WORDS_BIGENDIAN */
+#define LE_SHIFT(x) ((((x) & 0x7f7f7f7f7f7f7f7f) << 1) | \
+ (((x) & 0x8080808080808080) >> 15))
+static void
+_cmac64_block_mulx(union nettle_block8 *dst,
+ const union nettle_block8 *src)
+{
+ uint64_t carry = (src->u64 & 0x80) >> 7;
+
+ dst->u64 = LE_SHIFT(src->u64) ^ (0x1b00000000000000 & -carry);
+}
+#endif /* !WORDS_BIGENDIAN */
+
+void
+cmac64_set_key(struct cmac64_key *key, const void *cipher,
+ nettle_cipher_func *encrypt)
+{
+ static const union nettle_block8 zero_block;
+ union nettle_block8 L;
+
+ /* step 1 - generate subkeys k1 and k2 */
+ encrypt(cipher, 8, L.b, zero_block.b);
+
+ _cmac64_block_mulx(&key->K1, &L);
+ _cmac64_block_mulx(&key->K2, &key->K1);
+}
+
+void
+cmac64_init(struct cmac64_ctx *ctx)
+{
+ memset(&ctx->X, 0, sizeof(ctx->X));
+ ctx->index = 0;
+}
+
+#define MIN(x,y) ((x)<(y)?(x):(y))
+
+void
+cmac64_update(struct cmac64_ctx *ctx, const 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 < 8)
+ {
+ size_t len = MIN(8 - 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, 8);
+ encrypt(cipher, 8, ctx->X.b, Y.b);
+
+ while (msg_len > 8)
+ {
+ memxor3(Y.b, ctx->X.b, msg, 8);
+ encrypt(cipher, 8, ctx->X.b, Y.b);
+ msg += 8;
+ msg_len -= 8;
+ }
+
+ /*
+ * copy the last block, it will be processed in
+ * cmac64_digest().
+ */
+ memcpy(ctx->block.b, msg, msg_len);
+ ctx->index = msg_len;
+}
+
+void
+cmac64_digest(struct cmac64_ctx *ctx, const struct cmac64_key *key,
+ const void *cipher, nettle_cipher_func *encrypt,
+ unsigned length, uint8_t *dst)
+{
+ union nettle_block8 Y;
+
+ memset(ctx->block.b+ctx->index, 0, sizeof(ctx->block.b)-ctx->index);
+
+ /* re-use ctx->block for memxor output */
+ if (ctx->index < 8)
+ {
+ ctx->block.b[ctx->index] = 0x80;
+ memxor(ctx->block.b, key->K2.b, 8);
+ }
+ else
+ {
+ memxor(ctx->block.b, key->K1.b, 8);
+ }
+
+ memxor3(Y.b, ctx->block.b, ctx->X.b, 8);
+
+ assert(length <= 8);
+ if (length == 8)
+ {
+ encrypt(cipher, 8, dst, Y.b);
+ }
+ else
+ {
+ encrypt(cipher, 8, 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;
+}
projects / thirdparty / nettle.git / commitdiff
