Crisis.Ionic.Zip.ZipCrypto.InitCipher C# (CSharp) Method

ZipCrypto Class Documentation Usage Examples Of Crisis.Ionic.Zip.ZipCrypto::InitCipher Datei anzeigen Open project: teeknofil/Crisis-Wordlist-Generator

InitCipher() public method

This initializes the cipher with the given password. See AppNote.txt for details.
Step 1 - Initializing the encryption keys ----------------------------------------- Start with these keys: Key(0) := 305419896 (0x12345678) Key(1) := 591751049 (0x23456789) Key(2) := 878082192 (0x34567890) Then, initialize the keys with a password: loop for i from 0 to length(password)-1 update_keys(password(i)) end loop Where update_keys() is defined as: update_keys(char): Key(0) := crc32(key(0),char) Key(1) := Key(1) + (Key(0) bitwiseAND 000000ffH) Key(1) := Key(1) * 134775813 + 1 Key(2) := crc32(key(2),key(1) rightshift 24) end update_keys Where crc32(old_crc,char) is a routine that given a CRC value and a character, returns an updated CRC value after applying the CRC-32 algorithm described elsewhere in this document.

After the keys are initialized, then you can use the cipher to encrypt the plaintext.

Essentially we encrypt the password with the keys, then discard the ciphertext for the password. This initializes the keys for later use.

public InitCipher ( string passphrase ) : void
passphrase string /// The passphrase for encrypting or decrypting with this cipher. ///
return void 
        public void InitCipher(string passphrase)
        {
            byte[] p = SharedUtilities.StringToByteArray(passphrase);
            for (int i = 0; i < passphrase.Length; i++)
                UpdateKeys(p[i]);
        }

Usage Example

Beispiel #1
0
 public static ZipCrypto ForWrite(string password)
 {
     ZipCrypto z = new ZipCrypto();
     if (password == null)
         throw new BadPasswordException("This entry requires a password.");
     z.InitCipher(password);
     return z;
 }
All Usage Examples Of Crisis.Ionic.Zip.ZipCrypto::InitCipher
ZipCrypto
DecryptMessage
EncryptMessage
ForRead
ForWrite
InitCipher
UpdateKeys
ZipCrypto