CREATE OR REPLACE FUNCTION digest(text, text)
RETURNS bytea
AS 'MODULE_PATHNAME', 'pg_digest'
-LANGUAGE 'C';
+LANGUAGE 'C' IMMUTABLE STRICT;
CREATE OR REPLACE FUNCTION digest(bytea, text)
RETURNS bytea
AS 'MODULE_PATHNAME', 'pg_digest'
-LANGUAGE 'C';
+LANGUAGE 'C' IMMUTABLE STRICT;
CREATE OR REPLACE FUNCTION digest_exists(text)
RETURNS bool
AS 'MODULE_PATHNAME', 'pg_digest_exists'
-LANGUAGE 'C';
+LANGUAGE 'C' IMMUTABLE STRICT;
CREATE OR REPLACE FUNCTION hmac(text, text, text)
RETURNS bytea
AS 'MODULE_PATHNAME', 'pg_hmac'
-LANGUAGE 'C';
+LANGUAGE 'C' IMMUTABLE STRICT;
CREATE OR REPLACE FUNCTION hmac(bytea, bytea, text)
RETURNS bytea
AS 'MODULE_PATHNAME', 'pg_hmac'
-LANGUAGE 'C';
+LANGUAGE 'C' IMMUTABLE STRICT;
CREATE OR REPLACE FUNCTION hmac_exists(text)
RETURNS bool
AS 'MODULE_PATHNAME', 'pg_hmac_exists'
-LANGUAGE 'C';
+LANGUAGE 'C' IMMUTABLE STRICT;
CREATE OR REPLACE FUNCTION crypt(text, text)
RETURNS text
AS 'MODULE_PATHNAME', 'pg_crypt'
-LANGUAGE 'C';
+LANGUAGE 'C' IMMUTABLE STRICT;
CREATE OR REPLACE FUNCTION gen_salt(text)
RETURNS text
AS 'MODULE_PATHNAME', 'pg_gen_salt'
-LANGUAGE 'C';
+LANGUAGE 'C' VOLATILE STRICT;
CREATE OR REPLACE FUNCTION gen_salt(text, int4)
RETURNS text
AS 'MODULE_PATHNAME', 'pg_gen_salt_rounds'
-LANGUAGE 'C';
+LANGUAGE 'C' VOLATILE STRICT;
CREATE OR REPLACE FUNCTION encrypt(bytea, bytea, text)
RETURNS bytea
AS 'MODULE_PATHNAME', 'pg_encrypt'
-LANGUAGE 'C';
+LANGUAGE 'C' IMMUTABLE STRICT;
CREATE OR REPLACE FUNCTION decrypt(bytea, bytea, text)
RETURNS bytea
AS 'MODULE_PATHNAME', 'pg_decrypt'
-LANGUAGE 'C';
+LANGUAGE 'C' IMMUTABLE STRICT;
CREATE OR REPLACE FUNCTION encrypt_iv(bytea, bytea, bytea, text)
RETURNS bytea
AS 'MODULE_PATHNAME', 'pg_encrypt_iv'
-LANGUAGE 'C';
+LANGUAGE 'C' IMMUTABLE STRICT;
CREATE OR REPLACE FUNCTION decrypt_iv(bytea, bytea, bytea, text)
RETURNS bytea
AS 'MODULE_PATHNAME', 'pg_decrypt_iv'
-LANGUAGE 'C';
+LANGUAGE 'C' IMMUTABLE STRICT;
CREATE OR REPLACE FUNCTION cipher_exists(text)
RETURNS bool
AS 'MODULE_PATHNAME', 'pg_cipher_exists'
-LANGUAGE 'C';
+LANGUAGE 'C' IMMUTABLE STRICT;