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(PHP ActiveX) Hash a Hex StringDemonstrates common pitfalls in hashing a hex string.. Note: This example requires Chilkat v9.5.0.70 or greater.
<?php // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Crypt2') $crypt = new COM("Chilkat.Crypt2"); // We have a hex string to be SHA-256 hashed: "b08538d832bf" // The result we expect to receive is "8a9f04cb1adfbd7f59c5918635f92f6c847e5b15f9828519d2fdbd6ead0918fc" $strToHash = 'b08538d832bf'; // How do we get this result? // The 1st question to be answered is: What bytes are getting hashed? // There are two possibilities: // 1) Hash 12 bytes, namely the us-ascii values for 'b', '0', '8', '5', .... 'b', 'f' // or // 2) Hash 6 bytes: 0xb0, 0x85, ... 0xbf // // This is how to hash the 12 us-ascii byte values: // The Charset property defines the byte representation of the string passed to the hash algorithm: $crypt->Charset = 'us-ascii'; // The EncodingMode property defines the binary encoding (hex, base64, etc.) of the hash returned as an encoded string. $crypt->EncodingMode = 'hex'; $crypt->HashAlgorithm = 'sha256'; $hashValue = $crypt->hashStringENC($strToHash); print $crypt->LastErrorText . "\n"; print 'hash of 12 us-ascii bytes: ' . $hashValue . "\n"; // The result is: 327F2B33A0F0580D09840B0D7CEE54514CA33E9A (not what we were hoping). // ------------------------------------------- // This is how to hash the 6 bytes // // "hex" is not an actual character encoding. It's a special value to be used to tell Chilkat to hex decode // the string and pass the decoded bytes to the hash algorithm... // Note: This example requires Chilkat v9.5.0.70 or greater for the "hex" Charset to work properly. $crypt->Charset = 'hex'; // The EncodingMode and HashAlgorithm remain the same.. $hashValue = $crypt->hashStringENC($strToHash); print $crypt->LastErrorText . "\n"; print 'hash of 6 hex bytes: ' . $hashValue . "\n"; // The result is 8A9F04CB1ADFBD7F59C5918635F92F6C847E5B15F9828519D2FDBD6EAD0918FC (which equals the hash we were expecting) ?> |
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