Fix constness issue in pkcs5_pbes2()
diff --git a/include/mbedtls/pkcs5.h b/include/mbedtls/pkcs5.h
index 6a21af1..5a765e0 100644
--- a/include/mbedtls/pkcs5.h
+++ b/include/mbedtls/pkcs5.h
@@ -63,7 +63,7 @@
*
* \returns 0 on success, or a POLARSSL_ERR_xxx code if verification fails.
*/
-int pkcs5_pbes2( asn1_buf *pbe_params, int mode,
+int pkcs5_pbes2( const asn1_buf *pbe_params, int mode,
const unsigned char *pwd, size_t pwdlen,
const unsigned char *data, size_t datalen,
unsigned char *output );