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def hmac_crc32

bend-osdev-crypto@0.1.0.0 · check.bend:246

import bend-osdev-crypto@0.1.0.0/check.bend as Check
import Base
import bend-osdev-bytes@0.1.0.0/bytes.bend as B
import bend-osdev-crc@0.1.0.0/crc.bend as C
import bend-osdev-crypto@0.1.0.0/hmac.bend as Hm
import bend-osdev-crypto@0.1.0.0/inst_crc.bend as CR

246# HMAC over CRC-32: one-shot, in two pieces, and verify
247def hmac_crc32(+k: B.Octets, +a: B.Octets, +b: B.Octets) -> String:
248  +kk = Hm.CrHmac.key(~64n, ~CR.CrCrc32.digest(~C.crc32.spec()), k)
249  +t = Hm.CrHmac.mac(~CR.CrCrc32.digest(~C.crc32.spec()), kk, B.Octets.append(a, b))
250  +s = Hm.CrHmac.start(~U32, ~CR.CrCrc32.init(~C.crc32.spec()), ~CR.CrCrc32.update(~C.crc32.spec()), kk)
251  +t2 = Hm.CrHmac.finish(~U32, ~CR.CrCrc32.init(~C.crc32.spec()), ~CR.CrCrc32.update(~C.crc32.spec()), ~CR.CrCrc32.final(~C.crc32.spec()), Hm.CrHmac.update(~U32, ~CR.CrCrc32.update(~C.crc32.spec()), Hm.CrHmac.update(~U32, ~CR.CrCrc32.update(~C.crc32.spec()), s, a), b))
252  cat(B.Octets.hex(t), cat(" ", cat(B.Octets.hex(t2), cat(" ", yes_no(Hm.CrHmac.verify(~CR.CrCrc32.digest(~C.crc32.spec()), kk, B.Octets.append(a, b), t))))))

Uses (18)

Used by (1)