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Hello All, I am working on a project where the client has provided me with the public key file and the private-key is being passed via url, along with 2 params that will be used on my end. These are the basics of the process that I am to use for verifying. Generate your own plaintext message matching the format of the string provided Create a SHA1withRSA hash of this message using the provided public key (UTF-16LE encode and pass this value) Base64 decode the signature Using a SHA1withRSA validator, verify your hashed message matches the Base64 decoded value in step 3 At this point I have performed steps 1-3 but am having an issue with step 4. The code is failing here. When I say failing I mean it is not being verified. $base64Sig = base64_decode($signature, true); $publickey = getPemKey(); $rsa = new Crypt_RSA(); $rsa->loadKey($publickey, CRYPT_RSA_PUBLIC_FORMAT_RAW); $hashedPlainText = sha1($utfString); $utfString = mb_convert_encoding($hashedPlainText ,"UTF-16LE"); echo $rsa->verify($hashedPlainText, $base64Sig) ? 'verified' : 'unverified'; If anyone can provide me with a basic example or a few sites that have examples with example data, it would be appreciated as I'm not sure I am "Using a SHA1withRSA validator". Thanks ahead of time!