Java Digest类代码示例

import org.spongycastle.crypto.Digest; //导入依赖的package包/类
@Override
public void encodeTag(byte[] tag, SecretKey tagKey, long streamNumber) {
	if (tag.length < TAG_LENGTH) throw new IllegalArgumentException();
	if (streamNumber < 0 || streamNumber > MAX_32_BIT_UNSIGNED)
		throw new IllegalArgumentException();
	// Initialise the PRF
	Digest prf = new Blake2sDigest(tagKey.getBytes());
	// The output of the PRF must be long enough to use as a tag
	int macLength = prf.getDigestSize();
	if (macLength < TAG_LENGTH) throw new IllegalStateException();
	// The input is the stream number as a 64-bit integer
	byte[] input = new byte[INT_64_BYTES];
	ByteUtils.writeUint64(streamNumber, input, 0);
	prf.update(input, 0, input.length);
	byte[] mac = new byte[macLength];
	prf.doFinal(mac, 0);
	// The output is the first TAG_LENGTH bytes of the MAC
	System.arraycopy(mac, 0, tag, 0, TAG_LENGTH);
}
 

import org.spongycastle.crypto.Digest; //导入依赖的package包/类
@Override
public byte[] hash(String label, byte[]... inputs) {
	byte[] labelBytes = StringUtils.toUtf8(label);
	Digest digest = new Blake2sDigest();
	byte[] length = new byte[INT_32_BYTES];
	ByteUtils.writeUint32(labelBytes.length, length, 0);
	digest.update(length, 0, length.length);
	digest.update(labelBytes, 0, labelBytes.length);
	for (byte[] input : inputs) {
		ByteUtils.writeUint32(input.length, length, 0);
		digest.update(length, 0, length.length);
		digest.update(input, 0, input.length);
	}
	byte[] output = new byte[digest.getDigestSize()];
	digest.doFinal(output, 0);
	return output;
}
 

import org.spongycastle.crypto.Digest; //导入依赖的package包/类
private byte[] macKdf(SecretKey key, byte[]... inputs) {
	// Initialise the PRF
	Digest prf = new Blake2sDigest(key.getBytes());
	// The output of the PRF must be long enough to use as a key
	int macLength = prf.getDigestSize();
	if (macLength < SecretKey.LENGTH) throw new IllegalStateException();
	// Calculate the PRF over the concatenated length-prefixed inputs
	byte[] length = new byte[INT_32_BYTES];
	for (byte[] input : inputs) {
		ByteUtils.writeUint32(input.length, length, 0);
		prf.update(length, 0, length.length);
		prf.update(input, 0, input.length);
	}
	byte[] mac = new byte[macLength];
	prf.doFinal(mac, 0);
	// The output is the first SecretKey.LENGTH bytes of the MAC
	if (mac.length == SecretKey.LENGTH) return mac;
	byte[] truncated = new byte[SecretKey.LENGTH];
	System.arraycopy(mac, 0, truncated, 0, truncated.length);
	return truncated;
}
 

import org.spongycastle.crypto.Digest; //导入依赖的package包/类
public static Digest getDigest(HashAlgorithmTypes shaType) {


        if (shaType.equals(HashAlgorithmTypes.SHA_1)) {
            return new SHA1Digest();
        }
        if (shaType.equals(HashAlgorithmTypes.MD_5)) {
            return new MD5Digest();
        }
        if (shaType.equals(HashAlgorithmTypes.SHA_256)) {
            return new SHA256Digest();
        }
        if (shaType.equals(HashAlgorithmTypes.SHA_384)) {
            return new SHA384Digest();
        }
        if (shaType.equals(HashAlgorithmTypes.SHA_512)) {
            return new SHA512Digest();
        }
        return null;
    }
 

import org.spongycastle.crypto.Digest; //导入依赖的package包/类
/**
 * @param data
 *            - message to hash
 * @return - reipmd160 hash of the message
 */
public static byte[] ripemd160(byte[] data) {
    Digest digest = new RIPEMD160Digest();
    if (data != null) {
        byte[] resBuf = new byte[digest.getDigestSize()];
        digest.update(data, 0, data.length);
        digest.doFinal(resBuf, 0);
        return resBuf;
    }
    throw new NullPointerException("Can't hash a NULL value");
}
 

import org.spongycastle.crypto.Digest; //导入依赖的package包/类
private byte[] pbkdf2(String password, byte[] salt, int iterations) {
	byte[] utf8 = StringUtils.toUtf8(password);
	Digest digest = new SHA256Digest();
	PKCS5S2ParametersGenerator gen = new PKCS5S2ParametersGenerator(digest);
	gen.init(utf8, salt, iterations);
	int keyLengthInBits = SecretKey.LENGTH * 8;
	CipherParameters p = gen.generateDerivedParameters(keyLengthInBits);
	return ((KeyParameter) p).getKey();
}
 

import org.spongycastle.crypto.Digest; //导入依赖的package包/类
private long sampleRunningTime(int iterations) {
	byte[] password = {'p', 'a', 's', 's', 'w', 'o', 'r', 'd'};
	byte[] salt = new byte[PBKDF_SALT_BYTES];
	int keyLengthInBits = SecretKey.LENGTH * 8;
	long start = System.nanoTime();
	Digest digest = new SHA256Digest();
	PKCS5S2ParametersGenerator gen = new PKCS5S2ParametersGenerator(digest);
	gen.init(password, salt, iterations);
	gen.generateDerivedParameters(keyLengthInBits);
	return System.nanoTime() - start;
}
 

import org.spongycastle.crypto.Digest; //导入依赖的package包/类
PseudoRandomImpl(byte[] seed) {
	// Hash the seed to produce a 32-byte key
	byte[] key = new byte[32];
	Digest digest = new Blake2sDigest();
	digest.update(seed, 0, seed.length);
	digest.doFinal(key, 0);
	// Initialise the stream cipher with an all-zero nonce
	byte[] nonce = new byte[8];
	cipher.init(true, new ParametersWithIV(new KeyParameter(key), nonce));
}
 

import org.spongycastle.crypto.Digest; //导入依赖的package包/类
/**
 * @param data - message to hash
 * @return - reipmd160 hash of the message
 */
public static byte[] ripemd160(byte[] data) {
    Digest digest = new RIPEMD160Digest();
    if (data != null) {
        byte[] resBuf = new byte[digest.getDigestSize()];
        digest.update(data, 0, data.length);
        digest.doFinal(resBuf, 0);
        return resBuf;
    }
    throw new NullPointerException("Can't hash a NULL value");
}
 

import org.spongycastle.crypto.Digest; //导入依赖的package包/类
/**
 * @param data - message to hash
 *
 * @return - reipmd160 hash of the message
 */
public static byte[] ripemd160(byte[] data) {
  Digest digest = new RIPEMD160Digest();
  if (data != null) {
    byte[] resBuf = new byte[digest.getDigestSize()];
    digest.update(data, 0, data.length);
    digest.doFinal(resBuf, 0);
    return resBuf;
  }
  throw new NullPointerException("Can't hash a NULL value");
}
 

import org.spongycastle.crypto.Digest; //导入依赖的package包/类
private byte[] pbkdf2(char[] password, byte[] salt, int iterations) {
	byte[] utf8 = toUtf8ByteArray(password);
	Digest digest = new SHA384Digest();
	PKCS5S2ParametersGenerator gen = new PKCS5S2ParametersGenerator(digest);
	gen.init(utf8, salt, iterations);
	int keyLengthInBits = CIPHER_KEY_BYTES * 8;
	CipherParameters p = gen.generateDerivedParameters(keyLengthInBits);
	ByteUtils.erase(utf8);
	return ((KeyParameter) p).getKey();
}
 

import org.spongycastle.crypto.Digest; //导入依赖的package包/类
private long sampleRunningTime(int iterations) {
	byte[] password = { 'p', 'a', 's', 's', 'w', 'o', 'r', 'd' };
	byte[] salt = new byte[PBKDF_SALT_BYTES];
	int keyLengthInBits = CIPHER_KEY_BYTES * 8;
	long start = System.nanoTime();
	Digest digest = new SHA384Digest();
	PKCS5S2ParametersGenerator gen = new PKCS5S2ParametersGenerator(digest);
	gen.init(password, salt, iterations);
	gen.generateDerivedParameters(keyLengthInBits);
	return System.nanoTime() - start;
}
 

import org.spongycastle.crypto.Digest; //导入依赖的package包/类
/**
 * Calculate New Hash Value of the current thumbnail.
 * 
 * @param context
 * @param rawContact
 * @param batchOperation
 * @param rawContactId
 */
private static void setNewHashValue(Context context,
		BatchOperation batchOperation, long rawContactId) {
	// get photo and set new hash and version, because thumbnail will be
	// generated from the system.
	// Read photo
	final ContentResolver resolver = context.getContentResolver();
	final Cursor c = resolver.query(DataQuery.CONTENT_URI,
			DataQuery.PROJECTION, DataQuery.SELECTION_TYPE,
			new String[] { String.valueOf(rawContactId),
					Photo.CONTENT_ITEM_TYPE }, null);
	try {
		while (c.moveToNext()) {
			byte[] photo = c.getBlob(DataQuery.COLUMN_PHOTO_IMAGE);
			if (photo != null) {
				// Generate Hash
				Digest digest = new MD5Digest();
				byte[] resBuf = new byte[digest.getDigestSize()];
				digest.update(photo, 0, photo.length);
				digest.doFinal(resBuf, 0);
				String hash = Base64.encodeToString(resBuf, Base64.DEFAULT);
				int currVersion = c.getInt(DataQuery.COLUMN_VERSION);
				int newVersion = currVersion++;

				// Set Hash
				final ContactOperations contactOp = ContactOperations
						.updateExistingContact(rawContactId, true,
								batchOperation);
				final long id = c.getLong(DataQuery.COLUMN_ID);
				final Uri uri = ContentUris.withAppendedId(
						Data.CONTENT_URI, id);
				contactOp.updatePhotoHash(hash, newVersion, uri);
			}
		}
	} finally {
		c.close();
	}
}
 

import org.spongycastle.crypto.Digest; //导入依赖的package包/类
public ConcatKDFBytesGenerator(Digest digest) {
    this(1, digest);
}
 

import org.spongycastle.crypto.Digest; //导入依赖的package包/类
/**
 * return the underlying digest.
 */
public Digest getDigest()
{
    return digest;
}