com.google.crypto.tink.mac

Interface ChunkedMacVerification

public interface ChunkedMacVerification

An interface representing a verification of the Streaming MAC.

WARNING: Implementations of this interface are not thread-safe, so the caller must ensure thread-safety if accessing objects implementing this interface concurrently.

Method Summary

Modifier and Type	Method and Description
void	update(ByteBuffer data) Processes the next chunk of input, represented by ByteBuffer data.
void	verifyMac() Verifies that the provided data matches the tag.

Method Detail

update

void update(ByteBuffer data)
     throws GeneralSecurityException

Processes the next chunk of input, represented by ByteBuffer data. In particular, reads the data.remaining() number of bytes from the provided buffer, starting at the byte with position data.position().

Updates the inner state of the computation. Requires exclusive access.

NOTE: arbitrary slicing of data is permitted, i.e. a series of update()'s with inputs "ab", "cd", and "ef" produces the same result as a series of inputs "abc", "def".

Throws:

IllegalStateException - if called after verifyMac()

GeneralSecurityException - when something went wrong with the update

verifyMac

void verifyMac()
        throws GeneralSecurityException

Verifies that the provided data matches the tag. After this method has been called, the object can no longer be used.

Requires exclusive access.

Throws:

IllegalStateException - when called more than once

GeneralSecurityException - when the tag does not match the data