Hello all. I am after some assistance regarding the creation of a basic authentication header.

I am been asked to code against a restAPI that requires the creation of the authentication header using hmac sha256. I am running into issues getting the hash values to match against the restAPI yet when I check using an online hmac generator my values are correct

This leads me to believe I am doing something wrong when using the app key as part of the hash

The documentation states that the key is comprised of 32 two-character base-16 hexadecimal values. I guess this where my issue is

I don't know how I should be handling the key other than just parsing it as a string.

my simple code so far

#set the strings

$method="GET";
$appid="d6468df6c1e8419fb5ec50f62be9a28b";
$appkey="15c7a6e1a5bd73500db29dffd0e19b6c6228b044c64348a6f5d6d470c54fc
+208";
$path="/xxxxx/xxxx/api/v1/users/xxxx/xxxxx";

#build the string to hash

$step1="$method\\n $datestring\\n $appid\\n $path";

#hmac sha256hash the string

$step2=hmac_sha256_hex($step1, $appkey);

[download]

I am using hmac_sha256_hex as the app key string is in hex. I am clearly doing something wrong but no idea what?

Do i need to perform some conversion of the app key before using it? I am lost!

thanks for looking

In reply to HMAC Sha256 Help! by ribble

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