diff options
Diffstat (limited to 'core/src/main/java/org/spongycastle/util/encoders/Hex.java')
-rw-r--r-- | core/src/main/java/org/spongycastle/util/encoders/Hex.java | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/core/src/main/java/org/spongycastle/util/encoders/Hex.java b/core/src/main/java/org/spongycastle/util/encoders/Hex.java new file mode 100644 index 00000000..5d0efc13 --- /dev/null +++ b/core/src/main/java/org/spongycastle/util/encoders/Hex.java @@ -0,0 +1,151 @@ +package org.spongycastle.util.encoders; + +import java.io.ByteArrayOutputStream; +import java.io.IOException; +import java.io.OutputStream; + +import org.spongycastle.util.Strings; + +/** + * Utility class for converting hex data to bytes and back again. + */ +public class Hex +{ + private static final Encoder encoder = new HexEncoder(); + + public static String toHexString( + byte[] data) + { + return toHexString(data, 0, data.length); + } + + public static String toHexString( + byte[] data, + int off, + int length) + { + byte[] encoded = encode(data, off, length); + return Strings.fromByteArray(encoded); + } + + /** + * encode the input data producing a Hex encoded byte array. + * + * @return a byte array containing the Hex encoded data. + */ + public static byte[] encode( + byte[] data) + { + return encode(data, 0, data.length); + } + + /** + * encode the input data producing a Hex encoded byte array. + * + * @return a byte array containing the Hex encoded data. + */ + public static byte[] encode( + byte[] data, + int off, + int length) + { + ByteArrayOutputStream bOut = new ByteArrayOutputStream(); + + try + { + encoder.encode(data, off, length, bOut); + } + catch (Exception e) + { + throw new EncoderException("exception encoding Hex string: " + e.getMessage(), e); + } + + return bOut.toByteArray(); + } + + /** + * Hex encode the byte data writing it to the given output stream. + * + * @return the number of bytes produced. + */ + public static int encode( + byte[] data, + OutputStream out) + throws IOException + { + return encoder.encode(data, 0, data.length, out); + } + + /** + * Hex encode the byte data writing it to the given output stream. + * + * @return the number of bytes produced. + */ + public static int encode( + byte[] data, + int off, + int length, + OutputStream out) + throws IOException + { + return encoder.encode(data, off, length, out); + } + + /** + * decode the Hex encoded input data. It is assumed the input data is valid. + * + * @return a byte array representing the decoded data. + */ + public static byte[] decode( + byte[] data) + { + ByteArrayOutputStream bOut = new ByteArrayOutputStream(); + + try + { + encoder.decode(data, 0, data.length, bOut); + } + catch (Exception e) + { + throw new DecoderException("exception decoding Hex data: " + e.getMessage(), e); + } + + return bOut.toByteArray(); + } + + /** + * decode the Hex encoded String data - whitespace will be ignored. + * + * @return a byte array representing the decoded data. + */ + public static byte[] decode( + String data) + { + ByteArrayOutputStream bOut = new ByteArrayOutputStream(); + + try + { + encoder.decode(data, bOut); + } + catch (Exception e) + { + throw new DecoderException("exception decoding Hex string: " + e.getMessage(), e); + } + + return bOut.toByteArray(); + } + + /** + * decode the Hex encoded String data writing it to the given output stream, + * whitespace characters will be ignored. + * + * @return the number of bytes produced. + */ + public static int decode( + String data, + OutputStream out) + throws IOException + { + return encoder.decode(data, out); + } +} |