package com.google.crypto.tink.signature;
import com.google.crypto.tink.KeyTypeManager;
import com.google.crypto.tink.PublicKeyVerify;
import com.google.crypto.tink.proto.KeyData.KeyMaterialType;
import com.google.crypto.tink.proto.RsaSsaPkcs1PublicKey;
import com.google.crypto.tink.subtle.EngineFactory;
import com.google.crypto.tink.subtle.RsaSsaPkcs1VerifyJce;
import com.google.crypto.tink.subtle.Validators;
import com.google.protobuf.ByteString;
import com.google.protobuf.ExtensionRegistryLite;
import com.google.protobuf.InvalidProtocolBufferException;
import java.math.BigInteger;
import java.security.GeneralSecurityException;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.RSAPublicKeySpec;
class RsaSsaPkcs1VerifyKeyManager extends KeyTypeManager<RsaSsaPkcs1PublicKey> {
public RsaSsaPkcs1VerifyKeyManager() {
super(
RsaSsaPkcs1PublicKey.class,
new KeyTypeManager.PrimitiveFactory<PublicKeyVerify, RsaSsaPkcs1PublicKey>(
PublicKeyVerify.class) {
@Override
public PublicKeyVerify getPrimitive(RsaSsaPkcs1PublicKey keyProto)
throws GeneralSecurityException {
java.security.KeyFactory kf = EngineFactory.KEY_FACTORY.getInstance("RSA");
BigInteger modulus = new BigInteger(1, keyProto.getN().toByteArray());
BigInteger exponent = new BigInteger(1, keyProto.getE().toByteArray());
RSAPublicKey publicKey =
(RSAPublicKey) kf.generatePublic(new RSAPublicKeySpec(modulus, exponent));
return new RsaSsaPkcs1VerifyJce(
publicKey, SigUtil.toHashType(keyProto.getParams().getHashType()));
}
});
}
@Override
public String getKeyType() {
return "type.googleapis.com/google.crypto.tink.RsaSsaPkcs1PublicKey";
}
@Override
public int getVersion() {
return 0;
}
@Override
public KeyMaterialType keyMaterialType() {
return KeyMaterialType.ASYMMETRIC_PUBLIC;
}
@Override
public RsaSsaPkcs1PublicKey parseKey(ByteString byteString)
throws InvalidProtocolBufferException {
return RsaSsaPkcs1PublicKey.parseFrom(byteString, ExtensionRegistryLite.getEmptyRegistry());
}
@Override
public void validateKey(RsaSsaPkcs1PublicKey pubKey) throws GeneralSecurityException {
Validators.validateVersion(pubKey.getVersion(), getVersion());
Validators.validateRsaModulusSize((new BigInteger(1, pubKey.getN().toByteArray())).bitLength());
SigUtil.validateRsaSsaPkcs1Params(pubKey.getParams());
}
}