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-rw-r--r--lib/crypto/aes_cmac_128.c184
-rw-r--r--lib/crypto/aes_cmac_128.h41
-rw-r--r--lib/crypto/crypto.h1
-rw-r--r--lib/crypto/wscript_build9
4 files changed, 231 insertions, 4 deletions
diff --git a/lib/crypto/aes_cmac_128.c b/lib/crypto/aes_cmac_128.c
new file mode 100644
index 0000000000..b630eeacd4
--- /dev/null
+++ b/lib/crypto/aes_cmac_128.c
@@ -0,0 +1,184 @@
+/*
+ AES-CMAC-128 (rfc 4493)
+ Copyright (C) Stefan Metzmacher 2012
+ Copyright (C) Jeremy Allison 2012
+ Copyright (C) Michael Adam 2012
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program 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 a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "replace.h"
+#include "../lib/crypto/crypto.h"
+
+static const uint8_t const_Zero[] = {
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+};
+
+static const uint8_t const_Rb[] = {
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x87
+};
+
+#define _MSB(x) (((x)[0] & 0x80)?1:0)
+
+static inline void aes_cmac_128_left_shift_1(const uint8_t in[AES_BLOCK_SIZE],
+ uint8_t out[AES_BLOCK_SIZE])
+{
+ uint8_t overflow = 0;
+ int8_t i;
+
+ for (i = AES_BLOCK_SIZE - 1; i >= 0; i--) {
+ out[i] = in[i] << 1;
+
+ out[i] |= overflow;
+
+ overflow = _MSB(&in[i]);
+ }
+}
+
+static inline void aes_cmac_128_xor(const uint8_t in1[AES_BLOCK_SIZE],
+ const uint8_t in2[AES_BLOCK_SIZE],
+ uint8_t out[AES_BLOCK_SIZE])
+{
+ uint8_t i;
+
+ for (i = 0; i < AES_BLOCK_SIZE; i++) {
+ out[i] = in1[i] ^ in2[i];
+ }
+}
+
+void aes_cmac_128_init(struct aes_cmac_128_context *ctx,
+ const uint8_t K[AES_BLOCK_SIZE])
+{
+ uint8_t L[AES_BLOCK_SIZE];
+
+ ZERO_STRUCTP(ctx);
+
+ AES_set_encrypt_key(K, 128, &ctx->aes_key);
+
+ /* step 1 - generate subkeys k1 and k2 */
+
+ AES_encrypt(const_Zero, L, &ctx->aes_key);
+
+ if (_MSB(L) == 0) {
+ aes_cmac_128_left_shift_1(L, ctx->K1);
+ } else {
+ uint8_t tmp_block[AES_BLOCK_SIZE];
+
+ aes_cmac_128_left_shift_1(L, tmp_block);
+ aes_cmac_128_xor(tmp_block, const_Rb, ctx->K1);
+ ZERO_STRUCT(tmp_block);
+ }
+
+ if (_MSB(ctx->K1) == 0) {
+ aes_cmac_128_left_shift_1(ctx->K1, ctx->K2);
+ } else {
+ uint8_t tmp_block[AES_BLOCK_SIZE];
+
+ aes_cmac_128_left_shift_1(ctx->K1, tmp_block);
+ aes_cmac_128_xor(tmp_block, const_Rb, ctx->K2);
+ ZERO_STRUCT(tmp_block);
+ }
+
+ ZERO_STRUCT(L);
+}
+
+void aes_cmac_128_update(struct aes_cmac_128_context *ctx,
+ const uint8_t *_msg, size_t _msg_len)
+{
+ uint8_t tmp_block[AES_BLOCK_SIZE];
+ uint8_t Y[AES_BLOCK_SIZE];
+ const uint8_t *msg = _msg;
+ size_t msg_len = _msg_len;
+
+ /*
+ * copy the remembered last block
+ */
+ ZERO_STRUCT(tmp_block);
+ if (ctx->last_len) {
+ memcpy(tmp_block, ctx->last, ctx->last_len);
+ }
+
+ /*
+ * check if we expand the block
+ */
+ if (ctx->last_len < AES_BLOCK_SIZE) {
+ size_t len = MIN(AES_BLOCK_SIZE - ctx->last_len, msg_len);
+
+ memcpy(&tmp_block[ctx->last_len], msg, len);
+ memcpy(ctx->last, tmp_block, AES_BLOCK_SIZE);
+ msg += len;
+ msg_len -= len;
+ ctx->last_len += len;
+ }
+
+ if (msg_len == 0) {
+ /* if it is still the last block, we are done */
+ ZERO_STRUCT(tmp_block);
+ return;
+ }
+
+ /*
+ * It is not the last block anymore
+ */
+ ZERO_STRUCT(ctx->last);
+ ctx->last_len = 0;
+
+ /*
+ * now checksum everything but the last block
+ */
+ aes_cmac_128_xor(ctx->X, tmp_block, Y);
+ AES_encrypt(Y, ctx->X, &ctx->aes_key);
+
+ while (msg_len > AES_BLOCK_SIZE) {
+ memcpy(tmp_block, msg, AES_BLOCK_SIZE);
+ msg += AES_BLOCK_SIZE;
+ msg_len -= AES_BLOCK_SIZE;
+
+ aes_cmac_128_xor(ctx->X, tmp_block, Y);
+ AES_encrypt(Y, ctx->X, &ctx->aes_key);
+ }
+
+ /*
+ * copy the last block, it will be processed in
+ * aes_cmac_128_final().
+ */
+ memcpy(ctx->last, msg, msg_len);
+ ctx->last_len = msg_len;
+
+ ZERO_STRUCT(tmp_block);
+ ZERO_STRUCT(Y);
+}
+
+void aes_cmac_128_final(struct aes_cmac_128_context *ctx,
+ uint8_t T[AES_BLOCK_SIZE])
+{
+ uint8_t tmp_block[AES_BLOCK_SIZE];
+ uint8_t Y[AES_BLOCK_SIZE];
+
+ if (ctx->last_len < AES_BLOCK_SIZE) {
+ ctx->last[ctx->last_len] = 0x80;
+ aes_cmac_128_xor(ctx->last, ctx->K2, tmp_block);
+ } else {
+ aes_cmac_128_xor(ctx->last, ctx->K1, tmp_block);
+ }
+
+ aes_cmac_128_xor(tmp_block, ctx->X, Y);
+ AES_encrypt(Y, T, &ctx->aes_key);
+
+ ZERO_STRUCT(tmp_block);
+ ZERO_STRUCT(Y);
+ ZERO_STRUCTP(ctx);
+}
diff --git a/lib/crypto/aes_cmac_128.h b/lib/crypto/aes_cmac_128.h
new file mode 100644
index 0000000000..28117a06b3
--- /dev/null
+++ b/lib/crypto/aes_cmac_128.h
@@ -0,0 +1,41 @@
+/*
+ AES-CMAC-128 (rfc 4493)
+ Copyright (C) Stefan Metzmacher 2012
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program 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 a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef LIB_CRYPTO_AES_CMAC_128_H
+#define LIB_CRYPTO_AES_CMAC_128_H
+
+struct aes_cmac_128_context {
+ AES_KEY aes_key;
+
+ uint8_t K1[AES_BLOCK_SIZE];
+ uint8_t K2[AES_BLOCK_SIZE];
+
+ uint8_t X[AES_BLOCK_SIZE];
+
+ uint8_t last[AES_BLOCK_SIZE];
+ size_t last_len;
+};
+
+void aes_cmac_128_init(struct aes_cmac_128_context *ctx,
+ const uint8_t K[AES_BLOCK_SIZE]);
+void aes_cmac_128_update(struct aes_cmac_128_context *ctx,
+ const uint8_t *_msg, size_t _msg_len);
+void aes_cmac_128_final(struct aes_cmac_128_context *ctx,
+ uint8_t T[AES_BLOCK_SIZE]);
+
+#endif /* LIB_CRYPTO_AES_CMAC_128_H */
diff --git a/lib/crypto/crypto.h b/lib/crypto/crypto.h
index b5ea9c78d5..c0d85c899e 100644
--- a/lib/crypto/crypto.h
+++ b/lib/crypto/crypto.h
@@ -25,4 +25,5 @@
#include "../lib/crypto/hmacsha256.h"
#include "../lib/crypto/arcfour.h"
#include "../lib/crypto/aes.h"
+#include "../lib/crypto/aes_cmac_128.h"
diff --git a/lib/crypto/wscript_build b/lib/crypto/wscript_build
index 6ad1cade98..c4bfefc1fd 100644
--- a/lib/crypto/wscript_build
+++ b/lib/crypto/wscript_build
@@ -8,10 +8,11 @@ else:
extra_source += ' md5.c'
bld.SAMBA_SUBSYSTEM('LIBCRYPTO',
- source='crc32.c hmacmd5.c md4.c arcfour.c sha256.c hmacsha256.c aes.c rijndael-alg-fst.c' + extra_source,
- deps='talloc' + extra_deps
- )
-
+ source='''crc32.c hmacmd5.c md4.c arcfour.c sha256.c hmacsha256.c
+ aes.c rijndael-alg-fst.c aes_cmac_128.c
+ ''' + extra_source,
+ deps='talloc' + extra_deps
+ )
bld.SAMBA_SUBSYSTEM('TORTURE_LIBCRYPTO',
source='md4test.c md5test.c hmacmd5test.c',
generated by cgit (git 2.34.1) at 2024-11-03 02:56:33 +0000