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ASCII / ANSI Secret Key in Symmetric Encryption
Using an ASCII (or ANSI) secret key w/ symmetric encryption: AES, Blowfish, Twofish, RC2, 3DES, etc. Chilkat.Crypt2 crypt = new Chilkat.Crypt2(); bool success; success = crypt.UnlockComponent("Anything for 30-day trial"); if (success != true) { MessageBox.Show("Crypt component unlock failed"); return; } // A frequent support question goes something like this: // ------------------ // I am not able to decrypt strings encrypted using // cryptix.jce.provider.key.RawSecretKey (Java) like I would normally do. // The key generation is being done with the Rijndael algorithm (256-bit) // The AES encryption algorithm is "Rijndael/ECB/PKCS#5" // The 32 character source key I'm using is this: // 1234567890123456789012345678912 // // ------------------ // The customer tries to call GenerateSecretKey to // convert the 32-character source key to a binary secret key, // but this is incorrect (in this case). GenerateSecretKey // hashes a string of any length and produces binary hash output // that is of the appropriate size to be used as a secret key. // The telltale sign is that in this case, the string is the exact // length of the secret key. 32 ANSI characters = 256 bits. // Therefore, it is obvious that the bytes of the binary // secret key should be the exact ascii character values // of the string. string encKey; encKey = "1234567890123456789012345678912"; crypt.CryptAlgorithm = "aes"; // Mode is "ecb" or "cbc" crypt.CipherMode = "ecb"; crypt.KeyLength = 256; // Call SetEncodedKey with "ascii" to tell the component // to use the ascii-bytes as the binary secret key. // Make sure you call this after setting the KeyLength. crypt.SetEncodedKey(encKey,"ascii"); crypt.EncodingMode = "base64"; string text; text = "The quick brown fox jumped over the lazy dog."; // Encrypt a string and return the binary encrypted data // in a base-64 encoded string. string encText; encText = crypt.EncryptStringENC(text); textBox1.Text += encText + "\r\n"; // Decrypt and show the original string: string decryptedText; decryptedText = crypt.DecryptStringENC(encText); textBox1.Text += decryptedText + "\r\n"; |
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