appendSeq(aSequence)
Appends aSequence to the hash calculation. Returns self.
hmac(key, data)
Returns a hmac signature sequence or nil on error.
sha1
Completes the SHA1 calculation and returns the hash as a Buffer.
Once this method is called, append() should not be called again on the receiver or it will raise an exception.
sha1String
Returns a string containing a hexadecimal representation of the sha1 hash.
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