Example usage for org.bouncycastle.crypto Digest getAlgorithmName

Introduction

In this page you can find the example usage for org.bouncycastle.crypto Digest getAlgorithmName.

Prototype

public String getAlgorithmName();

Source Link

Document

return the algorithm name

Usage

From source file:android.core.CryptoTest.java

License:Apache License

/**
 * Processes the two given message digests for the same data and checks
 * the results. Requirement is that the results must be equal, the digest
 * implementations must have the same properties, and the new implementation
 * must be faster than the old one./* w  w  w  . j a  v  a 2s.c  om*/
 * 
 * @param oldDigest The old digest implementation, provided by Bouncy Castle 
 * @param newDigest The new digest implementation, provided by OpenSSL
 */
public void doTestMessageDigest(Digest oldDigest, Digest newDigest) {
    final int ITERATIONS = 10;

    byte[] data = new byte[1024];

    byte[] oldHash = new byte[oldDigest.getDigestSize()];
    byte[] newHash = new byte[newDigest.getDigestSize()];

    Assert.assertEquals("Hash names must be equal", oldDigest.getAlgorithmName(), newDigest.getAlgorithmName());
    Assert.assertEquals("Hash sizes must be equal", oldHash.length, newHash.length);
    Assert.assertEquals("Hash block sizes must be equal", ((ExtendedDigest) oldDigest).getByteLength(),
            ((ExtendedDigest) newDigest).getByteLength());
    for (int i = 0; i < data.length; i++) {
        data[i] = (byte) i;
    }

    long oldTime = 0;
    long newTime = 0;

    for (int j = 0; j < ITERATIONS; j++) {
        long t0 = System.currentTimeMillis();
        for (int i = 0; i < 4; i++) {
            oldDigest.update(data, 0, data.length);
        }
        int oldLength = oldDigest.doFinal(oldHash, 0);
        long t1 = System.currentTimeMillis();

        oldTime = oldTime + (t1 - t0);

        long t2 = System.currentTimeMillis();
        for (int i = 0; i < 4; i++) {
            newDigest.update(data, 0, data.length);
        }
        int newLength = newDigest.doFinal(newHash, 0);
        long t3 = System.currentTimeMillis();

        newTime = newTime + (t3 - t2);

        Assert.assertEquals("Hash sizes must be equal", oldLength, newLength);

        for (int i = 0; i < oldLength; i++) {
            Assert.assertEquals("Hashes[" + i + "] must be equal", oldHash[i], newHash[i]);
        }
    }

    android.util.Log.d("CryptoTest", "Time for " + ITERATIONS + " x old hash processing: " + oldTime + " ms");
    android.util.Log.d("CryptoTest", "Time for " + ITERATIONS + " x new hash processing: " + newTime + " ms");

    // Assert.assertTrue("New hash should be faster", newTime < oldTime);
}

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From source file:edu.vt.middleware.crypt.digest.DigestAlgorithm.java

License:Open Source License

/**
 * Sets the internal object responsible for digest computation.
 *
 * @param  d  Used for digest computation.
 *///  ww w  .  jav a2 s .c  om
protected void setDigest(final Digest d) {
    this.digest = d;
    this.algorithm = d.getAlgorithmName();
}

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