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(Visual FoxPro) Twofish Encryption - 128-bit, 192-bit, 256-bitTwofish encryption. The Chilkat encryption component supports 128-bit, 192-bit, and 256-bit Twofish encryption in both ECB (Electronic Cookbook) and CBC (Cipher-Block Chaining) modes.
LOCAL loCrypt LOCAL lcIvHex LOCAL lcKeyHex LOCAL lcEncStr LOCAL lcDecStr * 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 CreateObject('Chilkat_9_5_0.Crypt2') loCrypt = CreateObject('Chilkat.Crypt2') * Set the encryption algorithm = "twofish" loCrypt.CryptAlgorithm = "twofish" * CipherMode may be "ecb" or "cbc" loCrypt.CipherMode = "cbc" * KeyLength may be 128, 192, 256 loCrypt.KeyLength = 256 * The padding scheme determines the contents of the bytes * that are added to pad the result to a multiple of the * encryption algorithm's block size. Twofish has a block * size of 16 bytes, so encrypted output is always * a multiple of 16. loCrypt.PaddingScheme = 0 * EncodingMode specifies the encoding of the output for * encryption, and the input for decryption. * It may be "hex", "url", "base64", or "quoted-printable". loCrypt.EncodingMode = "hex" * An initialization vector is required if using CBC mode. * ECB mode does not use an IV. * The length of the IV is equal to the algorithm's block size. * It is NOT equal to the length of the key. lcIvHex = "000102030405060708090A0B0C0D0E0F" loCrypt.SetEncodedIV(lcIvHex,"hex") * The secret key must equal the size of the key. For * 256-bit encryption, the binary secret key is 32 bytes. * For 128-bit encryption, the binary secret key is 16 bytes. lcKeyHex = "000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F" loCrypt.SetEncodedKey(lcKeyHex,"hex") * Encrypt a string... * The input string is 44 ANSI characters (i.e. 44 bytes), so * the output should be 48 bytes (a multiple of 16). * Because the output is a hex string, it should * be 96 characters long (2 chars per byte). lcEncStr = loCrypt.EncryptStringENC("The quick brown fox jumps over the lazy dog.") ? lcEncStr * Now decrypt: lcDecStr = loCrypt.DecryptStringENC(lcEncStr) ? lcDecStr RELEASE loCrypt |
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