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Programming language: Crystal
License: MIT License
Tags:
Cryptography
Latest version: v1.0.0
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README
Crystal Lang CMAC
Crystal implementation of the Cipher-based Message Authentication Code (CMAC) as defined in RFC4493, RFC4494, and RFC4615. Message authentication codes provide integrity protection of data given that two parties share a secret key.
key = Random.new.random_bytes(16)
message = "attack at dawn"
cmac = CMAC.new(key)
cmac.sign(message)
=> Bytes[246, 184, 193, 76, 93, 115, 191, 26, 135, 60, 164, 161, 90, 224, 102, 170]
Once you've obtained the signature (also called a tag) of a message you can use CMAC to verify it as well.
tag = Bytes[246, 184, 193, 76, 93, 115, 191, 26, 135, 60, 164, 161, 90, 224, 102, 170]
cmac.valid_message?(tag, message)
=> true
cmac.valid_message?(tag, "attack at dusk")
=> false
CMAC can also be used with a variable length input key as described in RFC4615.
key = "setec astronomy"
message = "attack at dawn"
cmac = CMAC.new(key)
cmac.sign(message)
=> Bytes[92, 17, 144, 230, 145, 178, 196, 130, 96, 144, 166, 236, 58, 14, 28, 243]