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I'm using Ubuntu Server 10.10 and I have installed PostgreSQL 8.4 using apt-get install postgresql. I would like to use the built-in sha1() function, but it seems that I have to install pgcrypto first. But I don't know how to install it.

There is no pgcrypto if I try to install it using apt-get install pgcrypto and I don't find any files starting with pgcrypto in my system (I tried find / -name "pgcrypto*").

How do I install pgcrypto so I can use the digest('word-to-hash','sha1') function in my database queries?

Update: I'm struggling to install pgcrypto on another Ubuntu machine. After installing the package using sudo apt-get install postgresql-contrib-8.4 how do I install it to my current PostgreSQL database?

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Hi @Jonas, I'm not sure if you're having issues installing pgcrypto or if you're having issues getting it to work with your db install. It sounds like you have a repo issue. Verify this file exists on this path /usr/local/pgsql/share/contrib/pgcrypto.sql and let us know. – jcolebrand Mar 25 '11 at 14:46
@jcolebrand: No I don't have a /usr/local/pgsql directory. The only place where I have *.sql files are in /usr/share/postgresql/8.4/ but no crypto-related. – Jonas Mar 25 '11 at 15:00
up vote 15 down vote accepted

It's an external module for Postgres. You should install the postgresql-contrib-8.4 (or your pg version) package via apt:

apt-get install postgresql-contrib-8.4

Then you find the sql install file somewhere in the /usr/share/postgresql folder, and you'll need to run pgcryto.sql on the database.

psql -d <database> -f /usr/share/postgresql/8.4/contrib/pgcrypto.sql


$ cd /usr/share/postgresql/8.4/contrib
$ psql -d <database>
    psql (8.4.8)
    Type "help" for help.

    database=# \i pgcrypto.sql
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When I run sudo apt-get install postgres-contrib I get E: Unable to locate package postgres-contrib – Jonas Mar 25 '11 at 14:54
I googled and now I have installed it using sudo apt-get install postgresql-contrib-8.4 and then run \i <path-to-pgcrypto> using psql. – Jonas Mar 25 '11 at 15:59
That's the way to do it. I slightly updated the answer to include the note on the version for the package – DrColossos Mar 25 '11 at 17:19
Ah, the command was \i /usr/share/postgresql/8.4/contrib/pgcypto.sql – Jonas May 24 '11 at 16:24
Under postgresql 9.1 you type in command line: CREATE EXTENSION pgcrypto – Danubian Sailor Dec 30 '11 at 14:08

Note that I'm working on Ubuntu 12.04, which uses postgresql 9.1.

There, I needed to:

sudo apt-get install postgresql-contrib

And then in my database:

postgres@ztrustee:~$ psql test
psql (9.1.3)
Type "help" for help.
test=# CREATE EXTENSION pgcrypto;

And now I can use pgcrypto functionality, gen_random_bytes():

test=# create table test ( 
    not null 
    default encode( gen_random_bytes( 32 ), 'hex' ) 
    primary key, 
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "test_pkey" for table "test"
test=# \d test
                            Table "public.test"
 Column | Type |                         Modifiers                          
 id     | text | not null default encode(gen_random_bytes(32), 'hex'::text)
 value  | text | 
    "test_pkey" PRIMARY KEY, btree (id)

test=# insert into test (value) VALUES ('scoobydoo');
test=# select * from test;
                                id                                |   value   
 76dd5bd0120d3df797f932fbcb4f8aa5088e215ee2b920dddbff59c8595fbac7 | scoobydoo
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