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27 lines
813 B
Markdown
27 lines
813 B
Markdown
# Compute Hashes With pgcrypto
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The `pgcrypto` extension that comes with PostgreSQL adds access to some
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general hashing functions. Included are `md5`, `sha1`, `sha224`, `sha256`,
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`sha384` and `sha512`. Any of these hashing functions can be applied to an
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arbitrary string using the `digest` function. Here are example of the `md5`
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and `sha1` algorithms:
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```sql
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> create extension pgcrypto;
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CREATE EXTENSION
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> select digest('Hello, World!', 'md5');
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digest
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------------------------------------
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\x65a8e27d8879283831b664bd8b7f0ad4
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> select digest('Hello, World!', 'sha1');
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digest
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--------------------------------------------
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\x0a0a9f2a6772942557ab5355d76af442f8f65e01
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```
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See the [`pgcrypto` docs](
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http://www.postgresql.org/docs/current/static/pgcrypto.html) for more
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details.
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