int EVP_PKEY_save_parameters(EVP_PKEY *pkey,int mode);
int EVP_PKEY_cmp_parameters(EVP_PKEY *a,EVP_PKEY *b);
-int EVP_CIPHER_type(EVP_CIPHER *ctx);
+int EVP_CIPHER_type(const EVP_CIPHER *ctx);
/* calls methods */
int EVP_CIPHER_param_to_asn1(EVP_CIPHER_CTX *c, ASN1_TYPE *type);