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-rw-r--r--lib/aes.c75
1 files changed, 75 insertions, 0 deletions
diff --git a/lib/aes.c b/lib/aes.c
index e996b27..9d7a0a1 100644
--- a/lib/aes.c
+++ b/lib/aes.c
@@ -22,7 +22,11 @@
* REDISTRIBUTION OF THIS SOFTWARE.
*/
+#ifndef USE_HOSTCC
#include <common.h>
+#else
+#include <string.h>
+#endif
#include "aes.h"
/* forward s-box */
@@ -580,3 +584,74 @@ void aes_decrypt(u8 *in, u8 *expkey, u8 *out)
memcpy(out, state, sizeof(state));
}
+
+static void debug_print_vector(char *name, u32 num_bytes, u8 *data)
+{
+#ifdef DEBUG
+ printf("%s [%d] @0x%08x", name, num_bytes, (u32)data);
+ print_buffer(0, data, 1, num_bytes, 16);
+#endif
+}
+
+void aes_apply_cbc_chain_data(u8 *cbc_chain_data, u8 *src, u8 *dst)
+{
+ int i;
+
+ for (i = 0; i < AES_KEY_LENGTH; i++)
+ *dst++ = *src++ ^ *cbc_chain_data++;
+}
+
+void aes_cbc_encrypt_blocks(u8 *key_exp, u8 *src, u8 *dst, u32 num_aes_blocks)
+{
+ u8 zero_key[AES_KEY_LENGTH] = { 0 };
+ u8 tmp_data[AES_KEY_LENGTH];
+ /* Convenient array of 0's for IV */
+ u8 *cbc_chain_data = zero_key;
+ u32 i;
+
+ for (i = 0; i < num_aes_blocks; i++) {
+ debug("encrypt_object: block %d of %d\n", i, num_aes_blocks);
+ debug_print_vector("AES Src", AES_KEY_LENGTH, src);
+
+ /* Apply the chain data */
+ aes_apply_cbc_chain_data(cbc_chain_data, src, tmp_data);
+ debug_print_vector("AES Xor", AES_KEY_LENGTH, tmp_data);
+
+ /* Encrypt the AES block */
+ aes_encrypt(tmp_data, key_exp, dst);
+ debug_print_vector("AES Dst", AES_KEY_LENGTH, dst);
+
+ /* Update pointers for next loop. */
+ cbc_chain_data = dst;
+ src += AES_KEY_LENGTH;
+ dst += AES_KEY_LENGTH;
+ }
+}
+
+void aes_cbc_decrypt_blocks(u8 *key_exp, u8 *src, u8 *dst, u32 num_aes_blocks)
+{
+ u8 tmp_data[AES_KEY_LENGTH], tmp_block[AES_KEY_LENGTH];
+ /* Convenient array of 0's for IV */
+ u8 cbc_chain_data[AES_KEY_LENGTH] = { 0 };
+ u32 i;
+
+ for (i = 0; i < num_aes_blocks; i++) {
+ debug("encrypt_object: block %d of %d\n", i, num_aes_blocks);
+ debug_print_vector("AES Src", AES_KEY_LENGTH, src);
+
+ memcpy(tmp_block, src, AES_KEY_LENGTH);
+
+ /* Decrypt the AES block */
+ aes_decrypt(src, key_exp, tmp_data);
+ debug_print_vector("AES Xor", AES_KEY_LENGTH, tmp_data);
+
+ /* Apply the chain data */
+ aes_apply_cbc_chain_data(cbc_chain_data, tmp_data, dst);
+ debug_print_vector("AES Dst", AES_KEY_LENGTH, dst);
+
+ /* Update pointers for next loop. */
+ memcpy(cbc_chain_data, tmp_block, AES_KEY_LENGTH);
+ src += AES_KEY_LENGTH;
+ dst += AES_KEY_LENGTH;
+ }
+}