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md5sum and sha1sum functions

From: Paul Gearon <gearon@ieee.org>
Date: Fri, 3 Dec 2010 18:04:40 -0500
Message-ID: <AANLkTinZmapFSKmiexneAid8B+y+V1tOKD6M52cjhnTW@mail.gmail.com>
To: SPARQL Working Group <public-rdf-dawg@w3.org>
As discussed in the last teleconf, I would like to propose the include
of an "md5sum" function, in a similar fashion to MySQL.

MD5SUM is often used for storing passwords. SHA1SUM is used in a
similar way, and is also used for hashing email addresses in FOAF.

---

MD5SUM

The MD5SUM function accepts a single plain literal argument and
returns a simple literal containing a string of exactly 32 characters.
Each character represents a hexadecimal digit and is one of [0-9a-f].

The value returned from MD5SUM, is the result of applying the MD5
message-digest algorithm to the argument, as described in RFC 1321.
  http://tools.ietf.org/html/rfc1321

Examples:

SELECT (MD5SUM('') AS ?m)
WHERE { }

?m
--
"d41d8cd98f00b204e9800998ecf8427e"


SELECT (MD5SUM('a') AS ?m)
WHERE { }

?m
--
"0cc175b9c0f1b6a831c399e269772661"

SELECT (MD5SUM('message digest') AS ?m)
WHERE { }

?r
--
"f96b697d7cb7938d525a2f31aaf161d0"


------


Also, since SHA1SUM is used in FOAF, it could be included in the same
way. SHA1 is defined at:
  http://csrc.nist.gov/publications/fips/fips180-2/fips180-2withchangenotice.pdf
Example code is provided at:
  http://tools.ietf.org/html/rfc3174



SHA1SUM

The SHA1SUM function accepts a single plain literal argument and
returns a simple literal containing a string of exactly 32 characters.
Each character represents a hexadecimal digit and is one of [0-9a-f].

The value returned from SHA1SUM, is the result of applying the SHA-1
message-digest algorithm to the argument, as described in RFC 3174.
  http://tools.ietf.org/html/rfc3174

Examples:

SELECT (SHA1SUM('') AS ?m)
WHERE { }

?m
--
"da39a3ee5e6b4b0d3255bfef95601890afd80709"


SELECT (SHA1SUM('abc') AS ?m)
WHERE { }

?m
--
"a9993e364706816aba3e25717850c26c9cd0d89d"




Regards,
Paul Gearon
Received on Friday, 3 December 2010 23:05:14 GMT

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