add cfb8-aes modes

lib/hcrypto/aes.c

@@ -119,3 +119,26 @@ AES_cbc_encrypt(const unsigned char *in, unsigned char *out,
 	}
     }
 }
+
+void
+AES_cfb8_encrypt(const unsigned char *in, unsigned char *out,
+                 unsigned long size, const AES_KEY *key,
+                 unsigned char *iv, int forward_encrypt)
+{
+    int i;
+
+    for (i = 0; i < size; i++) {
+        unsigned char tmp[AES_BLOCK_SIZE + 1];
+
+        memcpy(tmp, iv, AES_BLOCK_SIZE);
+        AES_encrypt(iv, iv, key);
+        if (!forward_encrypt) {
+            tmp[AES_BLOCK_SIZE] = in[i];
+        }
+        out[i] = in[i] ^ iv[0];
+        if (forward_encrypt) {
+            tmp[AES_BLOCK_SIZE] = out[i];
+        }
+        memcpy(iv, &tmp[1], AES_BLOCK_SIZE);
+    }
+}