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; author: Thomas Hintz
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; email: t@thintz.com
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; license: bsd
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(module hmac
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(hmac)
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(import scheme chicken srfi-4 srfi-13)
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(use message-digest-port)
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; taken from example at http://wiki.call-cc.org/drupal-xml-rpc
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(define (hmac key digest-primitive #!optional (block-size 64))
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(when (> (string-length key) block-size)
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(set! key (call-with-output-digest digest-primitive (cut display key <>) 'string)))
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(set! key (string-pad-right key block-size (integer->char 0)))
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(let ((ipad (string-map (lambda (c) (integer->char (bitwise-xor (char->integer c) #x36))) key))
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(opad (string-map (lambda (c) (integer->char (bitwise-xor (char->integer c) #x5c))) key)))
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(lambda (message)
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(call-with-output-digest digest-primitive (cut display (string-append opad (call-with-output-digest digest-primitive (cut display (string-append ipad message) <>) 'string)) <>) 'string))))
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)
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