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    "## Hash-based Message Authentication Codes\n",
    "\n",
    "[https://en.wikipedia.org/wiki/HMAC]\n",
    "\n",
    "In cryptography, an HMAC (sometimes expanded as either keyed-hash\n",
    "message authentication code or hash-based message authentication code)\n",
    "is a specific type of message authentication code (MAC) involving a\n",
    "cryptographic hash function and a secret cryptographic key. As with\n",
    "any MAC, it may be used to simultaneously verify both the data\n",
    "integrity and authenticity of a message.\n",
    "\n",
    "    select crypto_auth_hmacsha512_keygen() hmac512key \\gset\n",
    "    select crypto_auth_hmacsha512('food', :'hmac512key') hmac512 \\gset\n",
    "\n",
    "    select is(crypto_auth_hmacsha512_verify(:'hmac512', 'food', :'hmac512key'), true, 'hmac512 verified');\n",
    "    select is(crypto_auth_hmacsha512_verify(:'hmac512', 'fo0d', :'hmac512key'), false, 'hmac512 not verified');\n",
    "\n",
    "[C API Documentation](https://doc.libsodium.org/advanced/hmac-sha2)\n"
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