Hi chaps, I think I'm going to struggle to describe this, but hopefully someone can squint and see where I'm going wrong. I've got a c function called "ftest", all it does is take some text and prepend "abcdefghijklmnopqr" onto it. I use it to pass a key into pgp_sym_encrypt/decrypt working on a bytea field in a table. The problem is that once the string I pass to "ftest" is longer than 10 characters it stops working when I use it with the bytea column and pgp_sym_decrypt, but it appears to work fine on it's own. 1) The source is here: http://privatepaste.com/890Bj3FGW0 2) I created a little makefile, as follows: MODULES = testf PGXS := $(shell pg_config --pgxs) include $(PGXS) 3) Then I did make, make install and created the function in the database: CREATE OR REPLACE FUNCTION testf( TEXT ) RETURNS TEXT AS 'testf.so', 'testf' LANGUAGE C STRICT IMMUTABLE; REVOKE ALL ON FUNCTION testf( TEXT ) FROM PUBLIC; GRANT EXECUTE ON FUNCTION testf( TEXT ) TO admins; 4) I created a table mytest as follows: CREATE TABLE mytest( username TEXT PRIMARY KEY, password BYTEA NOT NULL ); 5) Now with a 10 character string passed to ftest this works: TEST=# insert into mytest (username,password) values ('short_user', pgp_sym_encrypt('testword', testf('short_user'))); INSERT 0 1 TEST=# select pgp_sym_decrypt(password, testf('short_user')) from mytest where username = 'short_user'; pgp_sym_decrypt ----------------- testword (1 row) 6) However if the I make the string longer, the decryption fails: TEST=# insert into mytest (username,password) values ('longer_user', pgp_sym_encrypt('testword', testf('longer_user'))); INSERT 0 1 TEST=# select pgp_sym_decrypt(password, testf('longer_user')) from mytest where username = 'longer_user'; ERROR: Wrong key or corrupt data But the C function appears to be working on it's own: TEST=# select testf('longer_user'); testf ------------------------------- abcdefghijklmnopqrlonger_user (1 row) 7) But, if I insert the data into the table without using my function it works: TEST=# insert into mytest (username,password) values ('longer_user', pgp_sym_encrypt('testword', 'abcdefghijklmnopqrlonger_user')); INSERT 0 1 TEST=# select pgp_sym_decrypt(password, testf('longer_user')) from mytest where username = 'longer_user'; pgp_sym_decrypt ----------------- testword (1 row) So it appears that my function is only working in conjunction with pgp_sym_encrypt on an insert when the text value I pass into it is less than 10 characters long. It's driving me nuts, can anyone see what I'm doing wrong? Thanks Glyn -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
