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     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/perl-digest-hmac/description.txt	Sat May 21 21:38:29 2022 +0000
     1.3 @@ -0,0 +1,19 @@
     1.4 +HMAC is used for message integrity checks between two parties
     1.5 +that share a secret key, and works in combination with some
     1.6 +other Digest algorithm, usually MD5 or SHA-1.
     1.7 +The HMAC mechanism is described in RFC 2104.
     1.8 +
     1.9 +HMAC follow the common Digest:: interface, but the constructor
    1.10 +takes the secret key and the name of some other simple Digest::
    1.11 +as argument.
    1.12 +
    1.13 +The hmac() and hmac_hex() functions and the Digest::HMAC->new()
    1.14 +constructor takes an optional $blocksize argument as well.
    1.15 +The HMAC algorithm assumes the digester to hash by iterating a
    1.16 +basic compression function on blocks of data and the $blocksize
    1.17 +should match the byte-length of such blocks.
    1.18 +
    1.19 +The default $blocksize is 64 which is suitable for the MD5 and
    1.20 +SHA-1 digest functions.
    1.21 +For stronger algorithms the blocksize probably needs to be
    1.22 +increased.