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Find hardcoded algorithm-specific parameters

io.moderne.cryptography.FindHardcodedAlgorithmParameters

Detects hardcoded algorithm-specific parameters like RSA public exponents or EC curve parameters. These hardcoded values prevent algorithm agility and may use weak or non-standard parameters that compromise security.

Recipe source​

This recipe is only available to users of Moderne.

This recipe is available under the Moderne Proprietary License.

Example​

Before​
import java.math.BigInteger;
import java.security.spec.RSAKeyGenParameterSpec;
import java.security.KeyPairGenerator;

public class RSAExample {
    public void generateRSAKey() throws Exception {
        BigInteger publicExponent = new BigInteger("65537");
        RSAKeyGenParameterSpec spec = new RSAKeyGenParameterSpec(2048, publicExponent);

        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
        kpg.initialize(spec);
        kpg.generateKeyPair();
    }
}
After​
import java.math.BigInteger;
import java.security.spec.RSAKeyGenParameterSpec;
import java.security.KeyPairGenerator;

public class RSAExample {
    public void generateRSAKey() throws Exception {
        BigInteger publicExponent = /*~~(ALGORITHM_PARAMETER use)~~>*/new BigInteger("65537");
        RSAKeyGenParameterSpec spec = /*~~(ALGORITHM_PARAMETER use)~~>*/new RSAKeyGenParameterSpec(2048, publicExponent);

        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
        kpg.initialize(spec);
        kpg.generateKeyPair();
    }
}

Usage​

This recipe has no required configuration options. Users of Moderne can run it via the Moderne CLI.

You will need to have configured the Moderne CLI on your machine before you can run the following command.

shell
mod run . --recipe FindHardcodedAlgorithmParameters

If the recipe is not available locally, then you can install it using:

mod config recipes jar install io.moderne.recipe:rewrite-cryptography:0.13.5

See how this recipe works across multiple open-source repositories​

Run this recipe on OSS repos at scale with the Moderne SaaS.

The community edition of the Moderne platform enables you to easily run recipes across thousands of open-source repositories.

Please contact Moderne for more information about safely running the recipes on your own codebase in a private SaaS.

Data Tables​

Taint flow​

org.openrewrite.analysis.java.taint.table.TaintFlowTable

Records taint flows from sources to sinks with their taint types.

Column NameDescription
Source fileThe source file that the method call occurred in.
Source lineThe line number where the taint source is located.
SourceThe source code where taint originates.
Sink lineThe line number where the taint sink is located.
SinkThe sink code where taint flows to.
Taint typeThe taint type that matched at the sink.