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Diffstat (limited to 'core/src/main/java/org/bouncycastle/pqc/math/linearalgebra/LittleEndianConversions.java')
-rw-r--r--core/src/main/java/org/bouncycastle/pqc/math/linearalgebra/LittleEndianConversions.java230
1 files changed, 0 insertions, 230 deletions
diff --git a/core/src/main/java/org/bouncycastle/pqc/math/linearalgebra/LittleEndianConversions.java b/core/src/main/java/org/bouncycastle/pqc/math/linearalgebra/LittleEndianConversions.java
deleted file mode 100644
index c97fdc58..00000000
--- a/core/src/main/java/org/bouncycastle/pqc/math/linearalgebra/LittleEndianConversions.java
+++ /dev/null
@@ -1,230 +0,0 @@
-package org.bouncycastle.pqc.math.linearalgebra;
-
-/**
- * This is a utility class containing data type conversions using little-endian
- * byte order.
- *
- * @see BigEndianConversions
- */
-public final class LittleEndianConversions
-{
-
- /**
- * Default constructor (private).
- */
- private LittleEndianConversions()
- {
- // empty
- }
-
- /**
- * Convert an octet string of length 4 to an integer. No length checking is
- * performed.
- *
- * @param input the byte array holding the octet string
- * @return an integer representing the octet string <tt>input</tt>
- * @throws ArithmeticException if the length of the given octet string is larger than 4.
- */
- public static int OS2IP(byte[] input)
- {
- return ((input[0] & 0xff)) | ((input[1] & 0xff) << 8)
- | ((input[2] & 0xff) << 16) | ((input[3] & 0xff)) << 24;
- }
-
- /**
- * Convert an byte array of length 4 beginning at <tt>offset</tt> into an
- * integer.
- *
- * @param input the byte array
- * @param inOff the offset into the byte array
- * @return the resulting integer
- */
- public static int OS2IP(byte[] input, int inOff)
- {
- int result = input[inOff++] & 0xff;
- result |= (input[inOff++] & 0xff) << 8;
- result |= (input[inOff++] & 0xff) << 16;
- result |= (input[inOff] & 0xff) << 24;
- return result;
- }
-
- /**
- * Convert a byte array of the given length beginning at <tt>offset</tt>
- * into an integer.
- *
- * @param input the byte array
- * @param inOff the offset into the byte array
- * @param inLen the length of the encoding
- * @return the resulting integer
- */
- public static int OS2IP(byte[] input, int inOff, int inLen)
- {
- int result = 0;
- for (int i = inLen - 1; i >= 0; i--)
- {
- result |= (input[inOff + i] & 0xff) << (8 * i);
- }
- return result;
- }
-
- /**
- * Convert a byte array of length 8 beginning at <tt>inOff</tt> into a
- * long integer.
- *
- * @param input the byte array
- * @param inOff the offset into the byte array
- * @return the resulting long integer
- */
- public static long OS2LIP(byte[] input, int inOff)
- {
- long result = input[inOff++] & 0xff;
- result |= (input[inOff++] & 0xff) << 8;
- result |= (input[inOff++] & 0xff) << 16;
- result |= ((long)input[inOff++] & 0xff) << 24;
- result |= ((long)input[inOff++] & 0xff) << 32;
- result |= ((long)input[inOff++] & 0xff) << 40;
- result |= ((long)input[inOff++] & 0xff) << 48;
- result |= ((long)input[inOff++] & 0xff) << 56;
- return result;
- }
-
- /**
- * Convert an integer to an octet string of length 4.
- *
- * @param x the integer to convert
- * @return the converted integer
- */
- public static byte[] I2OSP(int x)
- {
- byte[] result = new byte[4];
- result[0] = (byte)x;
- result[1] = (byte)(x >>> 8);
- result[2] = (byte)(x >>> 16);
- result[3] = (byte)(x >>> 24);
- return result;
- }
-
- /**
- * Convert an integer into a byte array beginning at the specified offset.
- *
- * @param value the integer to convert
- * @param output the byte array to hold the result
- * @param outOff the integer offset into the byte array
- */
- public static void I2OSP(int value, byte[] output, int outOff)
- {
- output[outOff++] = (byte)value;
- output[outOff++] = (byte)(value >>> 8);
- output[outOff++] = (byte)(value >>> 16);
- output[outOff++] = (byte)(value >>> 24);
- }
-
- /**
- * Convert an integer to a byte array beginning at the specified offset. No
- * length checking is performed (i.e., if the integer cannot be encoded with
- * <tt>length</tt> octets, it is truncated).
- *
- * @param value the integer to convert
- * @param output the byte array to hold the result
- * @param outOff the integer offset into the byte array
- * @param outLen the length of the encoding
- */
- public static void I2OSP(int value, byte[] output, int outOff, int outLen)
- {
- for (int i = outLen - 1; i >= 0; i--)
- {
- output[outOff + i] = (byte)(value >>> (8 * i));
- }
- }
-
- /**
- * Convert an integer to a byte array of length 8.
- *
- * @param input the integer to convert
- * @return the converted integer
- */
- public static byte[] I2OSP(long input)
- {
- byte[] output = new byte[8];
- output[0] = (byte)input;
- output[1] = (byte)(input >>> 8);
- output[2] = (byte)(input >>> 16);
- output[3] = (byte)(input >>> 24);
- output[4] = (byte)(input >>> 32);
- output[5] = (byte)(input >>> 40);
- output[6] = (byte)(input >>> 48);
- output[7] = (byte)(input >>> 56);
- return output;
- }
-
- /**
- * Convert an integer to a byte array of length 8.
- *
- * @param input the integer to convert
- * @param output byte array holding the output
- * @param outOff offset in output array where the result is stored
- */
- public static void I2OSP(long input, byte[] output, int outOff)
- {
- output[outOff++] = (byte)input;
- output[outOff++] = (byte)(input >>> 8);
- output[outOff++] = (byte)(input >>> 16);
- output[outOff++] = (byte)(input >>> 24);
- output[outOff++] = (byte)(input >>> 32);
- output[outOff++] = (byte)(input >>> 40);
- output[outOff++] = (byte)(input >>> 48);
- output[outOff] = (byte)(input >>> 56);
- }
-
- /**
- * Convert an int array to a byte array of the specified length. No length
- * checking is performed (i.e., if the last integer cannot be encoded with
- * <tt>length % 4</tt> octets, it is truncated).
- *
- * @param input the int array
- * @param outLen the length of the converted array
- * @return the converted array
- */
- public static byte[] toByteArray(int[] input, int outLen)
- {
- int intLen = input.length;
- byte[] result = new byte[outLen];
- int index = 0;
- for (int i = 0; i <= intLen - 2; i++, index += 4)
- {
- I2OSP(input[i], result, index);
- }
- I2OSP(input[intLen - 1], result, index, outLen - index);
- return result;
- }
-
- /**
- * Convert a byte array to an int array.
- *
- * @param input the byte array
- * @return the converted array
- */
- public static int[] toIntArray(byte[] input)
- {
- int intLen = (input.length + 3) / 4;
- int lastLen = input.length & 0x03;
- int[] result = new int[intLen];
-
- int index = 0;
- for (int i = 0; i <= intLen - 2; i++, index += 4)
- {
- result[i] = OS2IP(input, index);
- }
- if (lastLen != 0)
- {
- result[intLen - 1] = OS2IP(input, index, lastLen);
- }
- else
- {
- result[intLen - 1] = OS2IP(input, index);
- }
-
- return result;
- }
-
-}