Class ChaCha20Cipher

    • Constructor Detail

      • ChaCha20Cipher

        public ChaCha20Cipher()
    • Method Detail

      • init

        public void init​(Cipher.Mode mode,
                         byte[] key,
                         byte[] iv)
                  throws java.lang.Exception
        Description copied from interface: Cipher
        Initialize the cipher for encryption or decryption with the given key and initialization vector
        Specified by:
        init in interface Cipher
        Parameters:
        mode - Encrypt/Decrypt initialization
        key - Key bytes
        iv - Initialization vector bytes
        Throws:
        java.lang.Exception - If failed to initialize
      • updateAAD

        public void updateAAD​(byte[] data,
                              int offset,
                              int length)
                       throws java.lang.Exception
        Description copied from interface: Cipher
        Adds the provided input data as additional authenticated data during encryption or decryption.
        Specified by:
        updateAAD in interface Cipher
        Parameters:
        data - The additional data to authenticate
        offset - The offset of the additional data in the buffer
        length - The number of bytes in the buffer to use for authentication
        Throws:
        java.lang.Exception - If failed to execute
      • update

        public void update​(byte[] input,
                           int inputOffset,
                           int inputLen)
                    throws java.lang.Exception
        Description copied from interface: Cipher
        Performs in-place encryption or decryption on the given data.
        Specified by:
        update in interface Cipher
        Parameters:
        input - The input/output bytes
        inputOffset - The offset of the data in the data buffer
        inputLen - The number of bytes to update - starting at the given offset
        Throws:
        java.lang.Exception - If failed to execute
      • getTransformation

        public java.lang.String getTransformation()
        Specified by:
        getTransformation in interface CipherInformation
        Returns:
        The actual transformation used - e.g., AES/CBC/NoPadding
      • getIVSize

        public int getIVSize()
        Specified by:
        getIVSize in interface CipherInformation
        Returns:
        Size of the initialization vector (in bytes)
      • getAuthenticationTagSize

        public int getAuthenticationTagSize()
        Specified by:
        getAuthenticationTagSize in interface CipherInformation
        Returns:
        Size of the authentication tag (AT) in bytes or 0 if this cipher does not support authentication
      • getCipherBlockSize

        public int getCipherBlockSize()
        Specified by:
        getCipherBlockSize in interface CipherInformation
        Returns:
        Size of block data used by the cipher (in bytes). For stream ciphers this value is (currently) used to indicate some average work buffer size to be used for the automatic re-keying mechanism described in RFC 4253 - Section 9
      • getKdfSize

        public int getKdfSize()
        Specified by:
        getKdfSize in interface CipherInformation
        Returns:
        The block size (in bytes) used to derive the secret key for this cipher
      • getKeySize

        public int getKeySize()
        Specified by:
        getKeySize in interface KeySizeIndicator
        Returns:
        The number of bits used in the key