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(PHP ActiveX) Duplicate .NET's Rfc2898DeriveBytes FunctionalityDemonstrates how to duplicate the results produced by .NET's System.Security.Cryptography.Rfc2898DeriveBytes class.
<?php // This example assumes Chilkat Crypt2 to have been previously unlocked. // See Unlock Crypt2 for sample code. // This example demonstrates how to duplicate the results produced // by .NET's System.Security.Cryptography.Rfc2898DeriveBytes class. // For example, here is C# code that transforms a password string into // bytes that can be used as a secret key for symmetric encryption (such as AES, blowfish, 3DES, etc.) // // Rfc2898DeriveBytes deriveBytes = new Rfc2898DeriveBytes("secret", System.Text.Encoding.UTF8.GetBytes("saltsalt123"), numIterations); // byte[] secretKeyBytes = deriveBytes.GetBytes(numBytes); // (The Rfc2898DeriveBytes computation is really just the PBKDF2 algorithm with SHA-1 hashing.) // In Chilkat, this is what we do to match... // First, let's get a test vector with known results. Both Chilkat AND Microsoft should produce // the same results. RFC 6070 has some PBKDF2 HMAC-SHA1 Test Vectors. Here is one of them: // Input: // P = "passwordPASSWORDpassword" (24 octets) // S = "saltSALTsaltSALTsaltSALTsaltSALTsalt" (36 octets) // c = 4096 // dkLen = 25 // // Output: // DK = 3d 2e ec 4f e4 1c 84 9b // 80 c8 d8 36 62 c0 e4 4a // 8b 29 1a 96 4c f2 f0 70 // 38 (25 octets) // // // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Crypt2') $crypt = new COM("Chilkat.Crypt2"); $salt = 'saltSALTsaltSALTsaltSALTsaltSALTsalt'; // Given that the salt is really binary data (can be any random bunch of bytes), // we must pass the exact hex string representation of the salt bytes. // In this case, we're getting the utf-8 byte representation of our salt string, // which is identical to the us-ascii byte representation because there are no 8bit chars.. $saltHex = $crypt->encodeString($salt,'utf-8','hex'); // Duplicate the test vector as shown above. $dkHex = $crypt->pbkdf2('passwordPASSWORDpassword','utf-8','sha1',$saltHex,4096,25 * 8,'hex'); print $dkHex . "\n"; ?> |
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