NAME

       kcapi_md_hmac_sha512 - HMAC SHA-512 keyed message digest on one buffer

SYNOPSIS

       ssize_t kcapi_md_hmac_sha512(const uint8_t * key, uint32_t keylen, const uint8_t * in,
                                    size_t inlen, uint8_t * out, size_t outlen);

ARGUMENTS

       key
           [in] buffer with HMAC key

       keylen
           [in] length of HMAC key buffer

       in
           [in] buffer with input data

       inlen
           [in] length of input buffer

       out
           [out] buffer for message digest

       outlen
           [in] length of out

DESCRIPTION

       With this one-shot convenience function, a keyed message digest of the given buffer is
       generated. The output buffer must be allocated by the caller and have at least the length
       of the message digest size for the chosen keyed message digest.

       return size of message digest upon success; -EIO - data cannot be obtained; -ENOMEM -
       buffer is too small for the complete message digest, the buffer is filled with the
       truncated message digest

AUTHOR

       Stephan Mueller <smueller@chronox.de>
           Author.

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