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11 lines
620 B
Scheme
11 lines
620 B
Scheme
14 years ago
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(use sha1 srfi-4 srfi-4-utils)
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; taken from example at http://wiki.call-cc.org/drupal-xml-rpc
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(define (sha1-hmac key)
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(when (> (string-length key) 64) (set! key (sha1-binary-digest key)))
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(set! key (string-pad-right key 64 (integer->char 0)))
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(set! key (blob->u8vector (string->blob key)))
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(let ((ipad (blob->string (u8vector->blob (u8vector-map (lambda (v) (bitwise-xor v #x36)) key))))
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(opad (blob->string (u8vector->blob (u8vector-map (lambda (v) (bitwise-xor v #x5c)) key)))))
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(lambda (message)
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(sha1-binary-digest (string-append opad (sha1-binary-digest (string-append ipad message)))))))
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