tango.util.digest.Sha256

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class Sha256 : MerkleDamgard [final] ¶

this() ¶

Construct an Sha256

void reset() [protected, override] ¶

Initialize the cipher

Remarks:

Returns the cipher state to it's initial value

void createDigest(ubyte[] buf) [protected, override] ¶

Obtain the digest

Remarks:

Returns a digest of the current cipher state, this may be the final digest, or a digest of the state between calls to update()

uint digestSize() [override] ¶

The digest size of Sha-256 is 32 bytes

uint blockSize() [protected, override] ¶

Cipher block size

Returns:

the block size

Remarks:

Specifies the size (in bytes) of the block of data to pass to each call to transform(). For SHA256 the blockSize is 64.

uint addSize() [protected, override] ¶

Length padding size

Returns:

the length padding size

Remarks:

Specifies the size (in bytes) of the padding which uses the length of the data which has been ciphered, this padding is carried out by the padLength method. For SHA256 the addSize is 8.

void padMessage(ubyte[] data) [protected, override] ¶

Pads the cipher data

Parameters:

data	a slice of the cipher buffer to fill with padding

Remarks:

Fills the passed buffer slice with the appropriate padding for the final call to transform(). This padding will fill the cipher buffer up to blockSize()-addSize().

void padLength(ubyte[] data, ulong length) [protected, override] ¶

Performs the length padding

Parameters:

data	the slice of the cipher buffer to fill with padding
length	the length of the data which has been ciphered

Remarks:

Fills the passed buffer slice with addSize() bytes of padding based on the length in bytes of the input data which has been ciphered.

void transform(const(ubyte[]) input) [protected, override] ¶

Performs the cipher on a block of data

Parameters:

data	the block of data to cipher

Remarks:

The actual cipher algorithm is carried out by this method on the passed block of data. This method is called for every blockSize() bytes of input data and once more with the remaining data padded to blockSize().