This section describes the CMAC extension of hash algorithm. The CMAC itself is described RFC 4493. The provided library make user be able to use the algorithm with the APIs of math library's hash algorithm APIs. For the APIs detail, see Hash operations.
Provides CMAC hash algorithm.
The name for CMAC hash algorithm.
The following example explains, how to use it.
(import (rnrs) (rfc cmac) (math) (crypto))
(define K (generate-secret-key AES (integer->bytevector
#x2b7e151628aed2a6abf7158809cf4f3c)))
(define aes-cipher (cipher AES K))
(hash CMAC #vu8() :cipher aes-cipher)
;; => #vu8(187 29 105 41 233 89 55 40 127 163 125 18 155 117 103 70)
;; for AES-CMAC-96
(hash CMAC #vu8() :cipher aes-cipher :size (/ 96 8))
;; => #vu8(187 29 105 41 233 89 55 40 127 163 125 18)
The RFC is defined for only AES block cipher however the implementation can take any block cipher such as DES3.
CAUTION: only AES cipher is tested.