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Class Acme.Crypto.CryptoUtils

java.lang.Object
   |
   +----Acme.Crypto.CryptoUtils

public class CryptoUtils

extends Object

These are static methods used by a lot of the cryptography classes. Most of them operate on byte arrays, which we call blocks. They could be encapsulated in a "Block" class, but that would mean a big efficiency hit - method calls are a lot more expensive than array accesses.

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CryptoUtils()

copyBlock(byte[], byte[])

Utility routine to copy one block to another.

copyBlock(byte[], int, byte[], int, int)

Utility routine to copy one block to another.

equalsBlock(byte[], byte[])

Utility routine to check two blocks for equality.

equalsBlock(byte[], int, byte[], int, int)

Utility routine to check two blocks for equality.

fillBlock(byte[], byte)

Utility routine fill a block with a given byte.

fillBlock(byte[], int, byte, int)

Utility routine fill a block with a given byte.

randomBlock(byte[])

Utility routine to fill a block with random bytes.

randomBlock(byte[], int, int)

Utility routine to fill a block with random bytes.

spreadIntsToBytes(int[], int, byte[], int, int)

Spread ints into bytes.

spreadIntsToBytesLittle(int[], int, byte[], int, int)

Spread ints into bytes, little-endian.

spreadShortsToBytes(int[], int, byte[], int, int)

Spread shorts into bytes.

spreadShortsToBytesLittle(int[], int, byte[], int, int)

Spread shorts into bytes, little endian.

squashBytesToInts(byte[], int, int[], int, int)

Squash bytes down to ints.

squashBytesToIntsLittle(byte[], int, int[], int, int)

Squash bytes down to ints, little-endian.

squashBytesToShorts(byte[], int, int[], int, int)

Squash bytes down to shorts.

squashBytesToShortsLittle(byte[], int, int[], int, int)

Squash bytes down to shorts, little endian.

toStringBlock(byte[])

Convert a block to a String representation.

toStringBlock(byte[], int, int)

Convert a block to a String representation.

xorBlock(byte[], byte[], byte[])

Utility routine to XOR two blocks.

xorBlock(byte[], int, byte[], int, byte[], int, int)

Utility routine to XOR two blocks.

zeroBlock(byte[])

Utility routine to fill a block with zeros.

zeroBlock(byte[], int, int)

Utility routine to fill a block with zeros.

 public CryptoUtils()

 public static void zeroBlock(byte block[],
                              int off,
                              int len)

Utility routine to fill a block with zeros.

 public static void zeroBlock(byte block[])

Utility routine to fill a block with zeros.

 public static void randomBlock(byte block[],
                                int off,
                                int len)

Utility routine to fill a block with random bytes.

 public static void randomBlock(byte block[])

Utility routine to fill a block with random bytes.

 public static void xorBlock(byte a[],
                             int aOff,
                             byte b[],
                             int bOff,
                             byte dst[],
                             int dstOff,
                             int len)

Utility routine to XOR two blocks.

 public static void xorBlock(byte a[],
                             byte b[],
                             byte dst[])

Utility routine to XOR two blocks.

 public static void copyBlock(byte src[],
                              int srcOff,
                              byte dst[],
                              int dstOff,
                              int len)

Utility routine to copy one block to another.

 public static void copyBlock(byte src[],
                              byte dst[])

Utility routine to copy one block to another.

 public static boolean equalsBlock(byte a[],
                                   int aOff,
                                   byte b[],
                                   int bOff,
                                   int len)

Utility routine to check two blocks for equality.

 public static boolean equalsBlock(byte a[],
                                   byte b[])

Utility routine to check two blocks for equality.

 public static void fillBlock(byte block[],
                              int blockOff,
                              byte b,
                              int len)

Utility routine fill a block with a given byte.

 public static void fillBlock(byte block[],
                              byte b)

Utility routine fill a block with a given byte.

 public static void squashBytesToInts(byte inBytes[],
                                      int inOff,
                                      int outInts[],
                                      int outOff,
                                      int intLen)

Squash bytes down to ints.

 public static void spreadIntsToBytes(int inInts[],
                                      int inOff,
                                      byte outBytes[],
                                      int outOff,
                                      int intLen)

Spread ints into bytes.

 public static void squashBytesToIntsLittle(byte inBytes[],
                                            int inOff,
                                            int outInts[],
                                            int outOff,
                                            int intLen)

Squash bytes down to ints, little-endian.

 public static void spreadIntsToBytesLittle(int inInts[],
                                            int inOff,
                                            byte outBytes[],
                                            int outOff,
                                            int intLen)

Spread ints into bytes, little-endian.

 public static void squashBytesToShorts(byte inBytes[],
                                        int inOff,
                                        int outShorts[],
                                        int outOff,
                                        int shortLen)

Squash bytes down to shorts.

 public static void spreadShortsToBytes(int inShorts[],
                                        int inOff,
                                        byte outBytes[],
                                        int outOff,
                                        int shortLen)

Spread shorts into bytes.

 public static void squashBytesToShortsLittle(byte inBytes[],
                                              int inOff,
                                              int outShorts[],
                                              int outOff,
                                              int shortLen)

Squash bytes down to shorts, little endian.

 public static void spreadShortsToBytesLittle(int inShorts[],
                                              int inOff,
                                              byte outBytes[],
                                              int outOff,
                                              int shortLen)

Spread shorts into bytes, little endian.

 public static String toStringBlock(byte block[],
                                    int off,
                                    int len)

Convert a block to a String representation.

 public static String toStringBlock(byte block[])

Convert a block to a String representation.

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