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Diffstat (limited to 'core/src/main/java/org/spongycastle/pqc/crypto/rainbow/util/RainbowUtil.java')
| -rw-r--r-- | core/src/main/java/org/spongycastle/pqc/crypto/rainbow/util/RainbowUtil.java | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/core/src/main/java/org/spongycastle/pqc/crypto/rainbow/util/RainbowUtil.java b/core/src/main/java/org/spongycastle/pqc/crypto/rainbow/util/RainbowUtil.java new file mode 100644 index 00000000..1e4f40f4 --- /dev/null +++ b/core/src/main/java/org/spongycastle/pqc/crypto/rainbow/util/RainbowUtil.java @@ -0,0 +1,230 @@ +package org.spongycastle.pqc.crypto.rainbow.util; + +/** + * This class is needed for the conversions while encoding and decoding, as well as for + * comparison between arrays of some dimensions + */ +public class RainbowUtil +{ + + /** + * This function converts an one-dimensional array of bytes into a + * one-dimensional array of int + * + * @param in the array to be converted + * @return out + * the one-dimensional int-array that corresponds the input + */ + public static int[] convertArraytoInt(byte[] in) + { + int[] out = new int[in.length]; + for (int i = 0; i < in.length; i++) + { + out[i] = in[i] & GF2Field.MASK; + } + return out; + } + + /** + * This function converts an one-dimensional array of bytes into a + * one-dimensional array of type short + * + * @param in the array to be converted + * @return out + * one-dimensional short-array that corresponds the input + */ + public static short[] convertArray(byte[] in) + { + short[] out = new short[in.length]; + for (int i = 0; i < in.length; i++) + { + out[i] = (short)(in[i] & GF2Field.MASK); + } + return out; + } + + /** + * This function converts a matrix of bytes into a matrix of type short + * + * @param in the matrix to be converted + * @return out + * short-matrix that corresponds the input + */ + public static short[][] convertArray(byte[][] in) + { + short[][] out = new short[in.length][in[0].length]; + for (int i = 0; i < in.length; i++) + { + for (int j = 0; j < in[0].length; j++) + { + out[i][j] = (short)(in[i][j] & GF2Field.MASK); + } + } + return out; + } + + /** + * This function converts a 3-dimensional array of bytes into a 3-dimensional array of type short + * + * @param in the array to be converted + * @return out + * short-array that corresponds the input + */ + public static short[][][] convertArray(byte[][][] in) + { + short[][][] out = new short[in.length][in[0].length][in[0][0].length]; + for (int i = 0; i < in.length; i++) + { + for (int j = 0; j < in[0].length; j++) + { + for (int k = 0; k < in[0][0].length; k++) + { + out[i][j][k] = (short)(in[i][j][k] & GF2Field.MASK); + } + } + } + return out; + } + + /** + * This function converts an array of type int into an array of type byte + * + * @param in the array to be converted + * @return out + * the byte-array that corresponds the input + */ + public static byte[] convertIntArray(int[] in) + { + byte[] out = new byte[in.length]; + for (int i = 0; i < in.length; i++) + { + out[i] = (byte)in[i]; + } + return out; + } + + + /** + * This function converts an array of type short into an array of type byte + * + * @param in the array to be converted + * @return out + * the byte-array that corresponds the input + */ + public static byte[] convertArray(short[] in) + { + byte[] out = new byte[in.length]; + for (int i = 0; i < in.length; i++) + { + out[i] = (byte)in[i]; + } + return out; + } + + /** + * This function converts a matrix of type short into a matrix of type byte + * + * @param in the matrix to be converted + * @return out + * the byte-matrix that corresponds the input + */ + public static byte[][] convertArray(short[][] in) + { + byte[][] out = new byte[in.length][in[0].length]; + for (int i = 0; i < in.length; i++) + { + for (int j = 0; j < in[0].length; j++) + { + out[i][j] = (byte)in[i][j]; + } + } + return out; + } + + /** + * This function converts a 3-dimensional array of type short into a 3-dimensional array of type byte + * + * @param in the array to be converted + * @return out + * the byte-array that corresponds the input + */ + public static byte[][][] convertArray(short[][][] in) + { + byte[][][] out = new byte[in.length][in[0].length][in[0][0].length]; + for (int i = 0; i < in.length; i++) + { + for (int j = 0; j < in[0].length; j++) + { + for (int k = 0; k < in[0][0].length; k++) + { + out[i][j][k] = (byte)in[i][j][k]; + } + } + } + return out; + } + + /** + * Compare two short arrays. No null checks are performed. + * + * @param left the first short array + * @param right the second short array + * @return the result of the comparison + */ + public static boolean equals(short[] left, short[] right) + { + if (left.length != right.length) + { + return false; + } + boolean result = true; + for (int i = left.length - 1; i >= 0; i--) + { + result &= left[i] == right[i]; + } + return result; + } + + /** + * Compare two two-dimensional short arrays. No null checks are performed. + * + * @param left the first short array + * @param right the second short array + * @return the result of the comparison + */ + public static boolean equals(short[][] left, short[][] right) + { + if (left.length != right.length) + { + return false; + } + boolean result = true; + for (int i = left.length - 1; i >= 0; i--) + { + result &= equals(left[i], right[i]); + } + return result; + } + + /** + * Compare two three-dimensional short arrays. No null checks are performed. + * + * @param left the first short array + * @param right the second short array + * @return the result of the comparison + */ + public static boolean equals(short[][][] left, short[][][] right) + { + if (left.length != right.length) + { + return false; + } + boolean result = true; + for (int i = left.length - 1; i >= 0; i--) + { + result &= equals(left[i], right[i]); + } + return result; + } + +} |