vespa-athenz/src/main/java/com/yahoo/vespa/athenz/identityprovider/client/IdentityDocumentSigner.java


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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.athenz.identityprovider.client;

import com.yahoo.security.SignatureUtils;
import com.yahoo.vespa.athenz.api.AthenzIdentity;
import com.yahoo.vespa.athenz.identityprovider.api.DefaultSignedIdentityDocument;
import com.yahoo.vespa.athenz.identityprovider.api.IdentityDocument;
import com.yahoo.vespa.athenz.identityprovider.api.IdentityType;
import com.yahoo.vespa.athenz.identityprovider.api.SignedIdentityDocument;
import com.yahoo.vespa.athenz.identityprovider.api.VespaUniqueInstanceId;

import java.nio.ByteBuffer;
import java.security.GeneralSecurityException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.SignatureException;
import java.time.Instant;
import java.util.Base64;
import java.util.Set;
import java.util.TreeSet;

import static java.nio.charset.StandardCharsets.UTF_8;

/**
 * Generates and validates the signature for a {@link SignedIdentityDocument}
 *
 * @author bjorncs
 */
public class IdentityDocumentSigner {

    public String generateSignature(String identityDocumentData, PrivateKey privateKey) {
        try {
            Signature signer = SignatureUtils.createSigner(privateKey);
            signer.initSign(privateKey);
            signer.update(identityDocumentData.getBytes(UTF_8));
            byte[] signature = signer.sign();
            return Base64.getEncoder().encodeToString(signature);
        } catch (GeneralSecurityException e) {
            throw new RuntimeException(e);
        }
    }

    public boolean hasValidSignature(SignedIdentityDocument doc, PublicKey publicKey) {
        if (doc instanceof DefaultSignedIdentityDocument signedDoc) {
            try {
                Signature signer = SignatureUtils.createVerifier(publicKey);
                signer.initVerify(publicKey);
                signer.update(signedDoc.data().getBytes(UTF_8));
                return signer.verify(Base64.getDecoder().decode(doc.signature()));
            } catch (GeneralSecurityException e) {
                throw new RuntimeException(e);
            }
        } else {
            throw new IllegalArgumentException("Unknown identity document type: " + doc.getClass().getName());
        }
    }
}