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37 changes: 37 additions & 0 deletions
37
src/main/java/eu/europa/ec/dgc/generation/Base45Encoder.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| package eu.europa.ec.dgc.generation; | ||
|
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| /** | ||
| * Base45 Encoder. | ||
| */ | ||
| public class Base45Encoder { | ||
| private static final String ALPHABET = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ $%*+-./:"; | ||
|
|
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| private Base45Encoder() { | ||
| } | ||
|
|
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| /** | ||
| * Encode a byte array to Base45 String. | ||
| * | ||
| * @param bytes bytes to encode | ||
| * @return encoded string | ||
| */ | ||
| public static String encodeToString(byte[] bytes) { | ||
| StringBuilder result = new StringBuilder(); | ||
| for (int i = 0; i < bytes.length; i += 2) { | ||
| if (bytes.length - i > 1) { | ||
| int x = ((bytes[i] & 0xFF) << 8) + (bytes[i + 1] & 0xFF); | ||
| int e = x / (45 * 45); | ||
| int y = x % (45 * 45); | ||
| int d = y / 45; | ||
| int c = y % 45; | ||
| result.append(ALPHABET.charAt(c)).append(ALPHABET.charAt(d)).append(ALPHABET.charAt(e)); | ||
| } else { | ||
| int x = bytes[i] & 0xFF; | ||
| int d = x / 45; | ||
| int c = x % 45; | ||
| result.append(ALPHABET.charAt(c)).append(ALPHABET.charAt(d)); | ||
| } | ||
| } | ||
| return result.toString(); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| package eu.europa.ec.dgc.generation; | ||
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| import java.io.ByteArrayOutputStream; | ||
| import org.bouncycastle.crypto.Digest; | ||
| import org.bouncycastle.crypto.digests.SHA256Digest; | ||
| import org.bouncycastle.util.Arrays; | ||
| import org.springframework.stereotype.Service; | ||
|
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| @Service | ||
| public class CopyDigest implements Digest { | ||
|
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| private final OpenByteArrayOutputStream binaryOut = new OpenByteArrayOutputStream(); | ||
| private final SHA256Digest sha256Digest = new SHA256Digest(); | ||
| private boolean wasReset = false; | ||
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| public String getAlgorithmName() { | ||
| return "NULL"; | ||
| } | ||
|
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| public int getDigestSize() { | ||
| return 32; | ||
| } | ||
|
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| /** | ||
| * Updates the Message Digest with one byte. | ||
| * | ||
| * @param in byte to update. | ||
| */ | ||
| public void update(byte in) { | ||
| if (wasReset) { | ||
| sha256Digest.update(in); | ||
| } else { | ||
| binaryOut.write(in); | ||
| } | ||
| } | ||
|
|
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| /** | ||
| * Updates the Message Digest with a byte array. | ||
| * | ||
| * @param in byte array to insert | ||
| * @param offset Offset | ||
| * @param length length | ||
| */ | ||
| public void update(byte[] in, int offset, int length) { | ||
| if (wasReset) { | ||
| sha256Digest.update(in, offset, length); | ||
| } else { | ||
| binaryOut.write(in, offset, length); | ||
| } | ||
| } | ||
|
|
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| /** | ||
| * close the digest, producing the final digest value. The doFinal | ||
| * call leaves the digest reset. | ||
| * | ||
| * @param out the array the digest is to be copied into. | ||
| * @param offset the offset into the out array the digest is to start at. | ||
| * @return size of output | ||
| */ | ||
| public int doFinal(byte[] out, int offset) { | ||
| if (wasReset) { | ||
| return sha256Digest.doFinal(out, offset); | ||
| } else { | ||
| int size = binaryOut.size(); | ||
| binaryOut.copy(out, offset); | ||
| reset(); | ||
| return size; | ||
| } | ||
| } | ||
|
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| /** | ||
| * Resets the Message Digest. | ||
| */ | ||
| @Override | ||
| public void reset() { | ||
| if (wasReset) { | ||
| sha256Digest.reset(); | ||
| } else { | ||
| if (binaryOut.size() > 0) { | ||
| wasReset = true; | ||
| binaryOut.reset(); | ||
| } | ||
| } | ||
| } | ||
|
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| private static class OpenByteArrayOutputStream | ||
| extends ByteArrayOutputStream { | ||
| public synchronized void reset() { | ||
| super.reset(); | ||
|
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| Arrays.clear(buf); | ||
| } | ||
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| void copy(byte[] out, int outOff) { | ||
| System.arraycopy(buf, 0, out, outOff, this.size()); | ||
| } | ||
| } | ||
| } |
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