No, file not needed.

contrib/pgcrypto/pgcrypto.sql

-
--- drop function digest(bytea, text);
--- drop function digest_exists(text);
--- drop function hmac(bytea, bytea, text);
--- drop function hmac_exists(text);
--- drop function crypt(text, text);
--- drop function gen_salt(text);
--- drop function gen_salt(text, int4);
--- drop function encrypt(bytea, bytea, text);
--- drop function decrypt(bytea, bytea, text);
--- drop function encrypt_iv(bytea, bytea, bytea, text);
--- drop function decrypt_iv(bytea, bytea, bytea, text);
--- drop function cipher_exists(text);
-
-
-
-CREATE FUNCTION digest(bytea, text) RETURNS bytea
-  AS '$libdir/pgcrypto',
-  'pg_digest' LANGUAGE 'C';
-
-CREATE FUNCTION digest_exists(text) RETURNS bool
-  AS '$libdir/pgcrypto',
-  'pg_digest_exists' LANGUAGE 'C';
-
-CREATE FUNCTION hmac(bytea, bytea, text) RETURNS bytea
-  AS '$libdir/pgcrypto',
-  'pg_hmac' LANGUAGE 'C';
-
-CREATE FUNCTION hmac_exists(text) RETURNS bool
-  AS '$libdir/pgcrypto',
-  'pg_hmac_exists' LANGUAGE 'C';
-
-CREATE FUNCTION crypt(text, text) RETURNS text
-  AS '$libdir/pgcrypto',
-  'pg_crypt' LANGUAGE 'C';
-
-CREATE FUNCTION gen_salt(text) RETURNS text
-  AS '$libdir/pgcrypto',
-  'pg_gen_salt' LANGUAGE 'C';
-
-CREATE FUNCTION gen_salt(text, int4) RETURNS text
-  AS '$libdir/pgcrypto',
-  'pg_gen_salt_rounds' LANGUAGE 'C';
-
-CREATE FUNCTION encrypt(bytea, bytea, text) RETURNS bytea
-  AS '$libdir/pgcrypto',
-  'pg_encrypt' LANGUAGE 'C';
-
-CREATE FUNCTION decrypt(bytea, bytea, text) RETURNS bytea
-  AS '$libdir/pgcrypto',
-  'pg_decrypt' LANGUAGE 'C';
-
-CREATE FUNCTION encrypt_iv(bytea, bytea, bytea, text) RETURNS bytea
-  AS '$libdir/pgcrypto',
-  'pg_encrypt_iv' LANGUAGE 'C';
-
-CREATE FUNCTION decrypt_iv(bytea, bytea, bytea, text) RETURNS bytea
-  AS '$libdir/pgcrypto',
-  'pg_decrypt_iv' LANGUAGE 'C';
-
-CREATE FUNCTION cipher_exists(text) RETURNS bool
-  AS '$libdir/pgcrypto',
-  'pg_cipher_exists' LANGUAGE 'C';
-
-