rspec/rules/S4426/kotlin/how-to-fix-it/java-cryptographic-extension.adoc

== How to fix it in Java Cryptographic Extension

=== Code examples

include::../../common/fix/code-rationale.adoc[]

==== Noncompliant code example

include::../../common/fix/rsa.adoc[]

[source,kotlin,diff-id=1,diff-type=noncompliant]
----
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;

fun main(args: Array<String>) {
    try {
        val keyPairGenerator = KeyPairGenerator.getInstance("RSA");
        keyPairGenerator.initialize(1024); // Noncompliant

    } catch (e: NoSuchAlgorithmException) {
        // ...
    }
}
----

include::../../common/fix/aes.adoc[]

[source,kotlin,diff-id=2,diff-type=noncompliant]
----
import java.security.KeyGenerator;
import java.security.NoSuchAlgorithmException;

fun main(args: Array<String>) {
    try {
        val keyGenerator = KeyGenerator.getInstance("AES");
        keyGenerator.initialize(64); // Noncompliant

    } catch (e: NoSuchAlgorithmException) {
        // ...
    }
}
----

include::../../common/fix/ec.adoc[]

[source,kotlin,diff-id=3,diff-type=noncompliant]
----
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.InvalidAlgorithmParameterException;
import java.security.spec.ECGenParameterSpec;

fun main(args: Array<String>) {
    try {
        val keyPairGenerator  = KeyPairGenerator.getInstance("EC");
        val ellipticCurveName = new ECGenParameterSpec("secp112r1"); // Noncompliant
        keyPairGenerator.initialize(ellipticCurveName);

    } catch (e: NoSuchAlgorithmException) {
        // ...
    } catch (e: InvalidAlgorithmParameterException) {
        // ...
    }
}
----

==== Compliant solution

[source,kotlin,diff-id=1,diff-type=compliant]
----
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;

fun main(args: Array<String>) {
    try {
        val keyPairGenerator = KeyPairGenerator.getInstance("RSA");
        keyPairGenerator.initialize(2048);

    } catch (e: NoSuchAlgorithmException) {
        // ...
    }
}
----

[source,kotlin,diff-id=2,diff-type=compliant]
----
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;

public static void main(String[] args) {
    try {
        val keyPairGenerator = KeyPairGenerator.getInstance("AES");
        keyPairGenerator.initialize(128);

    } catch (e: NoSuchAlgorithmException) {
        // ...
    }
}
----

[source,kotlin,diff-id=3,diff-type=compliant]
----
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.InvalidAlgorithmParameterException;
import java.security.spec.ECGenParameterSpec;

public static void main(String[] args) {
    try {
        val keyPairGenerator  = KeyPairGenerator.getInstance("EC");
        val ellipticCurveName = new ECGenParameterSpec("secp256r1");
        keyPairGenerator.initialize(ellipticCurveName);

    } catch (e: NoSuchAlgorithmException) {
        // ...
    } catch (e: InvalidAlgorithmParameterException) {
        // ...
    }
}
----

=== How does this work?

include::../../common/fix/fix.adoc[]

=== Going the extra mile

include::../../common/extra-mile/pre-quantum.adoc[]