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(Unicode C) Hashing Encoded DataThis example explains how it's important to know exactly what bytes are getting hashed when working with encoded data, such as hex, base64, etc.
#include <C_CkCrypt2W.h> void ChilkatSample(void) { HCkCrypt2W crypt; const wchar_t *strToHash; const wchar_t *hashValue; // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. crypt = CkCrypt2W_Create(); // Imagine we want to SHA-1 hash this A9133F6DC63E85BE0619763F8975CA076FF91B95CB6F121CD21C016143315E11B9ED4374F174B2CC strToHash = L"A9133F6DC63E85BE0619763F8975CA076FF91B95CB6F121CD21C016143315E11B9ED4374F174B2CC"; // The question is: Do we want to hash the bytes 0xA9, 0x13, 0x3F... // or do we want to literally hash each us-ascii byte: 'A', '9', '1', '3'. // The results will obviously be different depending on what bytes are actually hashed. // To hash the decoded bytes (i.e. 0xA9, 0x13, 0x3F...) we do this: // "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... CkCrypt2W_putCharset(crypt,L"hex"); CkCrypt2W_putHashAlgorithm(crypt,L"sha1"); // Get the hash result in lowercase hex CkCrypt2W_putEncodingMode(crypt,L"hex_lower"); hashValue = CkCrypt2W_hashStringENC(crypt,strToHash); wprintf(L"hash of decoded hex bytes: %s\n",hashValue); // The result is 7a4a2ba73811fab98b4baaee2df164cbdd0d8e8e // This is how to hash the us-ascii byte values: // The Charset property defines the byte representation of the string passed to the hash algorithm: CkCrypt2W_putCharset(crypt,L"us-ascii"); // The EncodingMode property defines the binary encoding (hex, base64, etc.) of the hash returned as an encoded string. CkCrypt2W_putEncodingMode(crypt,L"hex"); CkCrypt2W_putHashAlgorithm(crypt,L"sha1"); hashValue = CkCrypt2W_hashStringENC(crypt,strToHash); wprintf(L"hash of us-ascii bytes: %s\n",hashValue); // The result is: 2A7500F88734F4B19C79852CA0FF3E1C561F31C8 // CkCrypt2W_Dispose(crypt); } |
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