Hi, To generate an HMAC key using SHA-256, I can issue the following command: openssl dgst -sha256 -hmac <key> -binary < message.bin > mac.bin I realised (eventually!) that the key is not supplied as a hex string (0a0b34e5.. etc.) but in a binary format. Obviously this leads to some fairly unpleasant command lines when the key contains non-printable characters. Can anybody comment on whether this is likely to cause problems for Windows or Linux? Looking at the source code, there doesn't appear to be any other mechanism for passing the key via the command line. I'm using the FIPS 1.2 flavour of OpenSSL. Many thanks, Alistair.
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