frostfs-sdk-java/cryptography/src/main/java/info/FrostFS/sdk/Helper.java

package info.FrostFS.sdk;

import com.google.protobuf.AbstractMessage;
import com.google.protobuf.ByteString;
import org.bouncycastle.crypto.digests.RIPEMD160Digest;

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Helper {

    public static byte[] getRIPEMD160(byte[] value) {
        var hash = new byte[20];
        var digest = new RIPEMD160Digest();
        digest.update(value, 0, value.length);
        digest.doFinal(hash, 0);
        return hash;
    }

    public static MessageDigest getSha256Instance() {
        try {
            return MessageDigest.getInstance("SHA-256");
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        }
    }

    public static byte[] getSha256(byte[] value) {
        return getSha256Instance().digest(value);
    }

    public static ByteString getSha256(AbstractMessage value) {
        return ByteString.copyFrom(getSha256(value.toByteArray()));
    }

    public static String getHexString(byte[] array) {
        return String.format("%0" + (array.length << 1) + "x", new BigInteger(1, array));
    }
}