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    <p>My favourite answer - I would use the OpenSSL libraries, the HMAC function. I've successfully used the OpenSSL libraries in Delphi by adopting and adapting work from M Ferrante <a href="http://www.disi.unige.it/person/FerranteM/delphiopenssl/" rel="nofollow noreferrer">http://www.disi.unige.it/person/FerranteM/delphiopenssl/</a><br /> For other OpenSSL signing etc see <a href="https://stackoverflow.com/questions/1792541/convert-this-php-digital-signing-to-delphi/1808145#1808145">this link</a> <br/> In D2010 it's something like this (libeay32 is the unit taken from the web site and slightly modified for unicode/D2010):<br/></p> <pre><code>uses libeay32; const LIBEAY_DLL_NAME = 'libeay32.dll'; EVP_MAX_MD_SIZE = 64; function EVP_sha256: pEVP_MD; cdecl; external LIBEAY_DLL_NAME; function HMAC(evp: pEVP_MD; key: PByte; key_len: integer; data: PByte; data_len: integer; md: PByte; var md_len: integer): PByte; cdecl; external LIBEAY_DLL_NAME; function GetHMAC(const AKey, AData: string): TBytes; var key, data: TBytes; md_len: integer; res: PByte; begin OpenSSL_add_all_algorithms; // Seed the pseudo-random number generator // This should be something a little more "random"! RAND_load_file('c:\windows\paint.exe', 512); key := TEncoding.UTF8.GetBytes(AKey); data := TEncoding.UTF8.GetBytes(AData); md_len := EVP_MAX_MD_SIZE; SetLength(result, md_len); res := HMAC(EVP_sha256, @key[0], Length(key), @data[0], Length(data), @result[0], md_len); if (res &lt;&gt; nil) then begin SetLength(result, md_len); end; end; </code></pre> <p>Then call it with a key phrase and data string. The result is a TBytes which can be converted as required eg to Base64 using something like JclMime or a simple HexToString type function.<br/> For older version of Delphi you'll have to do a bit of changing of PBytes to PChars or something similar.<br/> Disclaimer: I've got no reference data to test this on but it seems to work ok!</p>
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