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Fix rich consent signing with Android Keystore keys #150

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Fix rich consent signing with Android Keystore keys #150

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25 changes: 17 additions & 8 deletions guardian/src/main/java/com/auth0/android/guardian/sdk/RichConsentsAPIClient.java
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Original file line number Diff line number Diff line change
Expand Up @@ -8,14 +8,17 @@
import androidx.annotation.NonNull;

import com.auth0.android.guardian.sdk.networking.RequestFactory;
import com.auth0.jwt.JWT;
import com.auth0.jwt.algorithms.Algorithm;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.reflect.TypeToken;

import java.lang.reflect.Type;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.interfaces.RSAPrivateKey;
import java.security.Signature;
import java.security.SignatureException;
import java.security.interfaces.RSAPublicKey;
import java.util.Date;
import java.util.HashMap;
Expand Down Expand Up @@ -84,11 +87,17 @@ private static String createProofOfPossessionAssertion(HttpUrl url, PrivateKey p
claims.put("jti", UUID.randomUUID().toString());
claims.put("iat", currentTime);

Algorithm alg = Algorithm.RSA256(null, (RSAPrivateKey) privateKey);
return JWT.create()
.withHeader(headers)
.withPayload(claims)
.sign(alg);
try {
Gson gson = new GsonBuilder().create();
String headerAndPayload = base64UrlSafeEncode(gson.toJson(headers).getBytes())
+ "." + base64UrlSafeEncode(gson.toJson(claims).getBytes());
Signature signer = Signature.getInstance("SHA256withRSA");
signer.initSign(privateKey);
signer.update(headerAndPayload.getBytes());
return headerAndPayload + "." + base64UrlSafeEncode(signer.sign());
} catch (NoSuchAlgorithmException | InvalidKeyException | SignatureException exception) {
throw new GuardianException("Unable to generate the signed DPoP assertion", exception);
}
}

/**
Expand Down