Java Code Examples for java.security.MessageDigest#clone()

The following examples show how to use java.security.MessageDigest#clone() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.

Example 1

Source File: MessageDigest2Test.java From j2objc with Apache License 2.0

6 votes

/**
 * java.security.MessageDigest#clone()
 */
public void test_clone() throws Exception {
    for (Entry<Provider, List<String>> e : digestAlgs.entrySet()) {
        for (String algorithm : e.getValue()) {
            MessageDigest d1 = MessageDigest.getInstance(algorithm, e.getKey().getName());
            for (byte b = 0; b < 84; b++) {
                d1.update(b);
            }

            MessageDigest d2 = (MessageDigest) d1.clone();
            d1.update((byte) 1);
            d2.update((byte) 1);

            assertTrue("cloned hash differs from original for algorithm " + algorithm,
                       MessageDigest.isEqual(d1.digest(), d2.digest()));
        }
    }
}

Example 2

Source File: MD5DigestCalculatingInputStream.java From markdown-image-kit with MIT License

5 votes

private MessageDigest cloneFrom(MessageDigest from) {
    try {
        return (MessageDigest)from.clone();
    } catch (CloneNotSupportedException e) { // should never occur
        throw new IllegalStateException("unexpected", e);
    }
}

Example 3

Source File: MD5DigestCalculatingInputStream.java From cos-java-sdk-v5 with MIT License

5 votes

private MessageDigest cloneFrom(MessageDigest from) {
    try {
        return (MessageDigest)from.clone();
    } catch (CloneNotSupportedException e) { // should never occur
        throw new IllegalStateException("unexpected", e);
    }
}

Example 4

Source File: TestCloning.java From openjdk-jdk9 with GNU General Public License v2.0

5 votes

private static MessageDigest testCloning(MessageDigest mdObj, Provider p)
    throws Exception {

    // copy#0: clone at state BLANK w/o any data
    MessageDigest mdCopy0 = (MessageDigest) mdObj.clone();

    // copy#1: clone again at state BUFFERED w/ very short data
    mdObj.update(data1);
    mdCopy0.update(data1);
    MessageDigest mdCopy1 = (MessageDigest) mdObj.clone();

    // copy#2: clone again after updating it w/ long data to trigger
    // the state into INIT
    mdObj.update(data2);
    mdCopy0.update(data2);
    mdCopy1.update(data2);
    MessageDigest mdCopy2 = (MessageDigest) mdObj.clone();

    // copy#3: clone again after updating it w/ very short data
    mdObj.update(data1);
    mdCopy0.update(data1);
    mdCopy1.update(data1);
    mdCopy2.update(data1);
    MessageDigest mdCopy3 = (MessageDigest) mdObj.clone();

    // copy#4: clone again after updating it w/ long data
    mdObj.update(data2);
    mdCopy0.update(data2);
    mdCopy1.update(data2);
    mdCopy2.update(data2);
    mdCopy3.update(data2);
    MessageDigest mdCopy4 = (MessageDigest) mdObj.clone();

    // check digest equalities
    byte[] answer = mdObj.digest();
    byte[] result0 = mdCopy0.digest();
    byte[] result1 = mdCopy1.digest();
    byte[] result2 = mdCopy2.digest();
    byte[] result3 = mdCopy3.digest();
    byte[] result4 = mdCopy4.digest();


    check(answer, result0, "copy0");
    check(answer, result1, "copy1");
    check(answer, result2, "copy2");
    check(answer, result3, "copy3");
    check(answer, result4, "copy4");

    return mdCopy3;
}

Example 5

Source File: Md5Checksum.java From aws-sdk-java-v2 with Apache License 2.0

5 votes

private MessageDigest cloneFrom(MessageDigest from) {
    try {
        return (MessageDigest) from.clone();
    } catch (CloneNotSupportedException e) { // should never occur
        throw new IllegalStateException("unexpected", e);
    }
}

Example 6

Source File: MD5DigestCalculatingInputStream.java From ibm-cos-sdk-java with Apache License 2.0

5 votes

private static boolean canBeCloned(MessageDigest digest) {
    try {
        digest.clone();
        return true;
    } catch (CloneNotSupportedException e) {
        return false;
    }
}

Example 7

Source File: MD5DigestCalculatingInputStream.java From ibm-cos-sdk-java with Apache License 2.0

5 votes

private MessageDigest cloneFrom(MessageDigest from) {
    try {
        return (MessageDigest)from.clone();
    } catch (CloneNotSupportedException e) {
        throw new IllegalStateException("Message digest implementation does not support cloning.", e);
    }
}

Example 8

Source File: MessageDigestHashFunction.java From exonum-java-binding with Apache License 2.0

5 votes

private static boolean supportsClone(MessageDigest digest) {
  try {
    digest.clone();
    return true;
  } catch (CloneNotSupportedException e) {
    return false;
  }
}

Example 9