1 files changed, 67 insertions, 0 deletions

diff --git a/src/libcrypto/libaes/aes_xcbc_mac.c b/src/libcrypto/libaes/aes_xcbc_mac.c
new file mode 100644
index 000000000..89d7bc067
--- /dev/null
+++ b/src/libcrypto/libaes/aes_xcbc_mac.c
@@ -0,0 +1,67 @@
+#ifdef __KERNEL__
+#include <linux/types.h>
+#include <linux/kernel.h>
+#define DEBUG(x) 
+#else
+#include <stdio.h>
+#include <sys/types.h>
+#define DEBUG(x) x
+#endif
+
+#include "aes.h"
+#include "aes_xcbc_mac.h"
+
+int AES_xcbc_mac_set_key(aes_context_mac *ctxm, const u_int8_t *key, int keylen)
+{
+	int ret=1;
+	aes_block kn[3] = { 
+		{ 0x01010101, 0x01010101, 0x01010101, 0x01010101 },
+		{ 0x02020202, 0x02020202, 0x02020202, 0x02020202 },
+		{ 0x03030303, 0x03030303, 0x03030303, 0x03030303 },
+	};
+	aes_set_key(&ctxm->ctx_k1, key, keylen, 0);
+	aes_encrypt(&ctxm->ctx_k1, (u_int8_t *) kn[0], (u_int8_t *) kn[0]);
+	aes_encrypt(&ctxm->ctx_k1, (u_int8_t *) kn[1], (u_int8_t *) ctxm->k2);
+	aes_encrypt(&ctxm->ctx_k1, (u_int8_t *) kn[2], (u_int8_t *) ctxm->k3);
+	aes_set_key(&ctxm->ctx_k1, (u_int8_t *) kn[0], 16, 0);
+	return ret;
+}
+static void do_pad_xor(u_int8_t *out, const u_int8_t *in, int len) {
+	int pos=0;
+	for (pos=1; pos <= 16; pos++, in++, out++) {
+		if (pos <= len)
+			*out ^= *in;
+		if (pos > len) {
+			DEBUG(printf("put 0x80 at pos=%d\n", pos));
+			*out ^= 0x80;
+			break;
+		}
+	}
+}
+static void xor_block(aes_block res, const aes_block op) {
+	res[0] ^= op[0];
+	res[1] ^= op[1];
+	res[2] ^= op[2];
+	res[3] ^= op[3];
+}
+int AES_xcbc_mac_hash(const aes_context_mac *ctxm, const u_int8_t * in, int ilen, u_int8_t hash[16]) {
+	int ret=ilen;
+	u_int32_t out[4] = { 0, 0, 0, 0 }; 
+	for (; ilen > 16 ; ilen-=16) {
+		xor_block(out, (const u_int32_t*) &in[0]);
+		aes_encrypt(&ctxm->ctx_k1, in, (u_int8_t *)&out[0]);
+		in+=16; 
+	}
+	do_pad_xor((u_int8_t *)&out, in, ilen);
+	if (ilen==16) {
+		DEBUG(printf("using k3\n"));
+		xor_block(out, ctxm->k3);
+	}
+	else 
+	{
+		DEBUG(printf("using k2\n"));
+		xor_block(out, ctxm->k2);
+	}
+	aes_encrypt(&ctxm->ctx_k1, (u_int8_t *)out, hash);
+	return ret;
+}