+ * EXAMPLE
+ *
+ * // Allocate AES-128 cipher in CBC mode
+ * SilcCipher aes;
+ *
+ * silc_cipher_alloc(SILC_CIPHER_AES_128_CBC, &aes);
+ *
+ * // Set key for encryption, key length must in bits
+ * silc_cipher_set_key(aes, key, key_len * 8, TRUE);
+ *
+ * // Set IV
+ * silc_cipher_set_iv(aes, iv);
+ *
+ * // Encrypt data
+ * silc_cipher_encrypt(aes, src, dst, len, NULL);
+ *