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timing, I know :)) At the moment the digest() function returns hexadecimal coded hash, but I want it to return pure binary. I have also included functions encode() and decode() which support 'base64' and 'hex' encodings, so if anyone needs digest() in hex he can do encode(digest(...), 'hex'). Main reason for it is "to do one thing and do it well" :) Another reason is if someone needs really lot of digesting, in the end he wants to store the binary not the hexadecimal result. It is really silly to convert it to hex then back to binary again. As I said if someone needs hex he can get it. Well, and the real reason that I am doing encrypt()/decrypt() functions and _they_ return binary. For testing I like to see it in hex occasionally, but it is really wrong to let them return hex. Only now it caught my eye that hex-coding in digest() is wrong. When doing digest() I thought about 'common case' but hacking with psql is probably _not_ the common case :) Marko Kreen
48 lines
1.0 KiB
Plaintext
48 lines
1.0 KiB
Plaintext
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DESCRIPTION
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Here are various cryptographic and otherwise useful
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functions for PostgreSQL.
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encode(data, type)
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encodes binary data into ASCII-only representation.
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Types supported are 'hex' and 'base64'.
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decode(data, type)
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decodes the data processed by encode()
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digest(data::text, hash_name::text)
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which returns cryptographic checksum over data by
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specified algorithm. eg
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> select encode(digest('blah', 'sha1'), 'hex');
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5bf1fd927dfb8679496a2e6cf00cbe50c1c87145
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digest_exists(hash_name::text)::bool
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which reports if particular hash type exists.
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If any of arguments are NULL they return NULL.
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HASHES
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For choosing library you must edit Makefile.
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standalone (default):
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MD5, SHA1
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(the code is from KAME project. Actually I hate code
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duplication, but I also want to quarantee that MD5 and
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SHA1 exist)
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mhash (0.8.1):
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MD5, SHA1, CRC32, CRC32B, GOST, TIGER, RIPEMD160,
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HAVAL(256,224,192,160,128)
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openssl:
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MD5, SHA1, RIPEMD160, MD2
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kerberos5 (heimdal):
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MD5, SHA1
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