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rainmakr
Known Participant
September 8, 2023
Question

Converting PHP hash to CF

Hello.  I'm hoping someone can help me convert some PHP hash code to CF (2018).  I'm confused by PHPs hash_init, hash_hmac, hash_update and hash_final.  

// PHP
  $sha256_hash  = hash_init("sha256",HASH_HMAC,$secret);
  hash_update($sha256_hash,$hash_string);
  $signature = hash_final($sha256_hash);

I'm having a hard time wrapping my head around the three steps being done here and what the HASH_HMAC contstant is in PHP (yes, I've Googled...).

I've taken a few stabs at it in CF with HASH and HMAC but am coming up empty.

<CFSET signature = lcase(hmac(hash_string, secret, "HMACSHA256")) >

Any thoughts?

      Thanks,

      John.     

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1 reply

BKBK
Community Expert
BKBKCommunity Expert
Community Expert
September 10, 2023

The PHP code,

 

$secret="123";
$hash_string="The quick brown fox jumped over the lazy dog.";
$sha256_hash  = hash_init("sha256",HASH_HMAC,$secret);
hash_update($sha256_hash,$hash_string);
$signature = hash_final($sha256_hash);
echo $signature;

 

and the following ColdFusion code,

 

secret="123";
hash_string="The quick brown fox jumped over the lazy dog.";
signature=lCase(hmac(hash_string,secret,"HMACSHA256"));
writeOutput(signature);

 

have the same output, which is: fb5d860dae8cd951827983f9581807771f31c584541595264eed0615ec86ae78 

 

See a similar question from last year: https://community.adobe.com/t5/coldfusion-discussions/php-base64-encode-hash-hmac-to-tobase64-hmac/m-p/12948287 

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