1HMAC256(1)                         Libgcrypt                        HMAC256(1)
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NAME

6       hmac256 - Compute an HMAC-SHA-256 MAC
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SYNOPSIS

9       hmac256 [--binary] key [FILENAME]
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DESCRIPTION

13       This  is  a  standalone  HMAC-SHA-256 implementation used to compute an
14       HMAC-SHA-256 message authentication code.  The tool has originally been
15       developed  as  a second implementation for Libgcrypt to allow comparing
16       against the primary implementation and to be used for internal  consis‐
17       tency  checks.   It  should  not  be used for sensitive data because no
18       mechanisms to clear the stack etc are used.
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20       The code has been written in a highly portable manner and requires only
21       a few standard definitions to be provided in a config.h file.
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24       hmac256 is commonly invoked as
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26         hmac256 "This is my key" foo.txt
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29       This  compute  the MAC on the file ‘foo.txt’ using the key given on the
30       command line.
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OPTIONS

34       hmac256 understands these options:
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38       --binary
39              Print the MAC as a binary string.  The default is to  print  the
40              MAC encoded has lower case hex digits.
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43       --version
44              Print version of the program and exit.
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SEE ALSO

48       sha256sum(1)
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52Libgcrypt 1.8.4                   2018-12-04                        HMAC256(1)