-int silc_cipher_is_supported(const unsigned char *name);
-char *silc_cipher_get_supported();
-int silc_cipher_encrypt(SilcCipher cipher, const unsigned char *src,
- unsigned char *dst, uint32 len,
- unsigned char *iv);
-int silc_cipher_decrypt(SilcCipher cipher, const unsigned char *src,
- unsigned char *dst, uint32 len,
- unsigned char *iv);
-int silc_cipher_set_key(SilcCipher cipher, const unsigned char *key,
- uint32 keylen);
+bool silc_cipher_is_supported(const unsigned char *name);
+char *silc_cipher_get_supported(void);
+bool silc_cipher_encrypt(SilcCipher cipher, const unsigned char *src,
+ unsigned char *dst, uint32 len,
+ unsigned char *iv);
+bool silc_cipher_decrypt(SilcCipher cipher, const unsigned char *src,
+ unsigned char *dst, uint32 len,
+ unsigned char *iv);
+bool silc_cipher_set_key(SilcCipher cipher, const unsigned char *key,
+ uint32 keylen);