net.i2p.crypto
Class SHA256Generator

java.lang.Object
  net.i2p.crypto.SHA256Generator

public final class SHA256Generator
extends Object

Defines a wrapper for SHA-256 operation. As of release 0.8.7, uses java.security.MessageDigest by default. If that is unavailable, it uses GNU-Crypto Sha256Standalone

Constructor Summary

SHA256Generator(I2PAppContext context)

Method Summary

Hash	calculateHash(byte[] source) Calculate the SHA-256 hash of the source and cache the result.
Hash	calculateHash(byte[] source, int start, int len) Calculate the hash and cache the result.
void	calculateHash(byte[] source, int start, int len, byte[] out, int outOffset) Use this if you only need the data, not a Hash object.
static MessageDigest	getDigestInstance() Return a new MessageDigest from the system libs unless unavailable in this JVM, in that case return a wrapped GNU Sha256Standalone
static SHA256Generator	getInstance()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SHA256Generator

public SHA256Generator(I2PAppContext context)

Parameters:

context - unused

Method Detail

getInstance

public static final SHA256Generator getInstance()

calculateHash

public final Hash calculateHash(byte[] source)

Calculate the SHA-256 hash of the source and cache the result.

Parameters:

source - what to hash

Returns:

hash of the source

calculateHash

public final Hash calculateHash(byte[] source,
                                int start,
                                int len)

Calculate the hash and cache the result.

calculateHash

public final void calculateHash(byte[] source,
                                int start,
                                int len,
                                byte[] out,
                                int outOffset)

Use this if you only need the data, not a Hash object. Does not cache.

Parameters:

out - needs 32 bytes starting at outOffset

getDigestInstance

public static MessageDigest getDigestInstance()

Return a new MessageDigest from the system libs unless unavailable in this JVM, in that case return a wrapped GNU Sha256Standalone

Since:

0.8.7, public since 0.8.8 for FortunaStandalone