Add the fast crypto function in supplicant

optimize the speed when do wifi connect

components/wpa_supplicant/src/fast_crypto/fast_aes-unwrap.c

@@ -0,0 +1,81 @@
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Hardware crypto support Copyright 2017 Espressif Systems (Shanghai) PTE LTD
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "crypto/includes.h"
+#include "crypto/common.h"
+#include "mbedtls/aes.h"
+
+/**
+ * fast_aes_unwrap - Unwrap key with AES Key Wrap Algorithm (128-bit KEK) (RFC3394)
+ * @kek: Key encryption key (KEK)
+ * @n: Length of the plaintext key in 64-bit units; e.g., 2 = 128-bit = 16
+ * bytes
+ * @cipher: Wrapped key to be unwrapped, (n + 1) * 64 bits
+ * @plain: Plaintext key, n * 64 bits
+ * Returns: 0 on success, -1 on failure (e.g., integrity verification failed)
+ */
+int 
+fast_aes_unwrap(const uint8_t *kek, int n, const uint8_t *cipher, uint8_t *plain)
+{
+    uint8_t a[8], *r, b[16];
+    int32_t i, j;
+    int32_t ret = 0;
+    mbedtls_aes_context ctx;
+
+    /* 1) Initialize variables. */
+    os_memcpy(a, cipher, 8);
+    r = plain;
+    os_memcpy(r, cipher + 8, 8 * n);
+
+    mbedtls_aes_init(&ctx);
+    ret = mbedtls_aes_setkey_dec(&ctx, kek, 128);
+    if (ret < 0) {
+        mbedtls_aes_free(&ctx);
+        return ret;
+    }
+
+    /* 2) Compute intermediate values.
+     * For j = 5 to 0
+     *     For i = n to 1
+     *         B = AES-1(K, (A ^ t) | R[i]) where t = n*j+i
+     *         A = MSB(64, B)
+     *         R[i] = LSB(64, B)
+     */
+    for (j = 5; j >= 0; j--) {
+        r = plain + (n - 1) * 8;
+        for (i = n; i >= 1; i--) {
+            os_memcpy(b, a, 8);
+            b[7] ^= n * j + i;
+            os_memcpy(b + 8, r, 8);
+            mbedtls_aes_decrypt(&ctx, b, b);
+            os_memcpy(a, b, 8);
+            os_memcpy(r, b + 8, 8);
+            r -= 8;
+        }
+    }
+    mbedtls_aes_free(&ctx);
+
+    /* 3) Output results.
+     *
+     * These are already in @plain due to the location of temporary
+     * variables. Just verify that the IV matches with the expected value.
+     */
+    for (i = 0; i < 8; i++) {
+        if (a[i] != 0xa6) {
+            return -1;
+        }
+    }
+
+    return 0;
+}