diff options
Diffstat (limited to 'libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/digests/ShortenedDigest.java')
-rw-r--r-- | libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/digests/ShortenedDigest.java | 80 |
1 files changed, 0 insertions, 80 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/digests/ShortenedDigest.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/digests/ShortenedDigest.java deleted file mode 100644 index 274959f56..000000000 --- a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/digests/ShortenedDigest.java +++ /dev/null @@ -1,80 +0,0 @@ -package org.spongycastle.crypto.digests; - -import org.spongycastle.crypto.ExtendedDigest; - -/** - * Wrapper class that reduces the output length of a particular digest to - * only the first n bytes of the digest function. - */ -public class ShortenedDigest - implements ExtendedDigest -{ - private ExtendedDigest baseDigest; - private int length; - - /** - * Base constructor. - * - * @param baseDigest underlying digest to use. - * @param length length in bytes of the output of doFinal. - * @exception IllegalArgumentException if baseDigest is null, or length is greater than baseDigest.getDigestSize(). - */ - public ShortenedDigest( - ExtendedDigest baseDigest, - int length) - { - if (baseDigest == null) - { - throw new IllegalArgumentException("baseDigest must not be null"); - } - - if (length > baseDigest.getDigestSize()) - { - throw new IllegalArgumentException("baseDigest output not large enough to support length"); - } - - this.baseDigest = baseDigest; - this.length = length; - } - - public String getAlgorithmName() - { - return baseDigest.getAlgorithmName() + "(" + length * 8 + ")"; - } - - public int getDigestSize() - { - return length; - } - - public void update(byte in) - { - baseDigest.update(in); - } - - public void update(byte[] in, int inOff, int len) - { - baseDigest.update(in, inOff, len); - } - - public int doFinal(byte[] out, int outOff) - { - byte[] tmp = new byte[baseDigest.getDigestSize()]; - - baseDigest.doFinal(tmp, 0); - - System.arraycopy(tmp, 0, out, outOff, length); - - return length; - } - - public void reset() - { - baseDigest.reset(); - } - - public int getByteLength() - { - return baseDigest.getByteLength(); - } -} |