class BlockCodec in Tinman.Core.Codec

Abstract base class for IBlockCodec implementations.

abstract class

BlockCodec

implements

IBlockCodec

Public / Attributes

BlockLengthInput

Length of a single input block, in bytes.

public abstract property	BlockLengthInput { get }
type	int32
value	[>0]	The input block length, in bytes.
implements	IBlockCodec.BlockLengthInput

Remarks:

This is the number of bytes that are read from the input during each call to ProcessBlock().

BlockLengthOutput

Length of a single output block, in bytes.

public abstract property	BlockLengthOutput { get }
type	int32
value	[>0]	The output block length, in bytes.
implements	IBlockCodec.BlockLengthOutput

Remarks:

This is the number of bytes that are written to the output during each call to ProcessBlock().

Mode

The mode of this block codec.

public abstract property	Mode { get }
type	CodecMode
value		The codec mode.
implements	IBlockCodec.Mode

Name

Name of this block codec.

public abstract property	Name { get }
type	string
value	[not-null]	The codec name.
implements	IBlockCodec.Name

Public / Methods

AES

Creates a new instance of IBlockCodec that implements the symmetric cipher AES.

public static method	AES (CodecMode mode, int8[] keyData)
type	IBlockCodec
params	mode		Encode or decode?
	keyData	[not-null]	Bytes of the cipher key. Must be 128, 192 or 256 bits in length.
returns		[not-null]	The created IBlockCodec instance.

ProcessBlock

Processes the given input data block.

public abstract method	ProcessBlock (ByteBuffer input, ByteBuffer output)
params	input	[not-null]	The input data block. Must have at least BlockLengthInput of Remaining bytes.
	output	[not-null]	The output data buffer. Must have at least BlockLengthOutput of Remaining bytes.
implements	IBlockCodec.ProcessBlock

---

Processes the given input data block.

public abstract method	ProcessBlock (int8[] input, int32 inputOffset, int8[] output, int32 outputOffset)
params	input	[not-null]	The input data block. Must contain at least BlockLengthInput bytes starting at inputOffset.
	inputOffset	[>=0]	Offset into input to first byte of input data block.
	output	[not-null]	The output data buffer. Must contain at least BlockLengthOutput bytes starting at outputOffset.
	outputOffset	[>=0]	Offset into output to first byte of output data buffer.
implements	IBlockCodec.ProcessBlock

RSA

Creates a new instance of IBlockCodec that implements the asymmetric cipher RSA.

public static method	RSA (CodecMode mode, int32[] modulus, int32[] exponent = null)
type	IBlockCodec
params	mode		Encode or decode?
	modulus	[not-null]	The shared modulus N of the key.
	exponent		The exponent (e or d, depending on Mode) of the key. If null, the value 65537 will be used. Defaults to null.
returns		[not-null]	The created IBlockCodec instance.

Remarks:

Separate keys are used for encoding and decoding:

(e, N)
(d, N)

where e is the encoding exponent, d is the decoding exponent and N is the shared modulus. A plaintext message m (i.e. a single input block, interpreted as a big integer value) is encrypted into ciphertext c using this formula:

c = m^e % N
m = c^d % N

Big integer values are specified as arrays of 32-bit integers, in big-endian order.