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A cryptographic algorithm that contains a possibly reversible hashing algorithm.
Some cryptography algorithms are nowadays considered as outdated and unsafe or actually broken, since they are too easy to decode. This checker identifies uses of unsafe algorithms for cryptography.
The OWASP documentation provides more information on Using the Java Cryptographic Extensions.
| Class Name | Cryptographic Algorithm with Weak Hash (Java) | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Significance | security | ||||||||||||||||||
| Mnemonic | JAVA.CRYPTO.CAWH | ||||||||||||||||||
| Categories |
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| Availability | Available for Java and Kotlin. |
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| Enabling | Checks for this warning class are enabled by
default. To disable them, add the following WARNING_FILTER rule to the
project configuration file.
WARNING_FILTER += discard class="Cryptographic Algorithm with Weak Hash (Java)" |
Japanese (ja)
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.Signature;
import java.security.SignatureException;
import java.util.Arrays;
public class Signature {
public static String getSignature(String text) {
String ret = null;
try {
KeyPair keyPair = getKeyPair();
byte[] data = text.getBytes("UTF8");
Signature signature = Signature.getInstance("SHA1withRSA"); // "Cryptographic Algorithm with Weak Hash (Java)" warning issued here
signature.initSign(keyPair.getPrivate());
signature.update(data);
byte[] bytes = signature.sign();
ret = Arrays.toString(bytes);
} catch (UnsupportedEncodingException | NoSuchAlgorithmException
| InvalidKeyException | SignatureException e) {
System.out.println("Unable to compute the signature: " + e);
}
return ret;
}
private static KeyPair getKeyPair() throws NoSuchAlgorithmException
{
KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA");
generator.initialize(1024);
return generator.genKeyPair();
}
}
In this example, the analysis triggers a Cryptographic Algorithm with Weak Hash (Java) warning because RSA (a safe cryptographic algorithm) is used in combination with SHA-1 (an unsafe hashing algorithm) to generate a signature. The OWASP documentation provides more information on Testing for Weak Encryption.
To resolve this issue, change the hashing algorithm to a more secure one. For example, replace string "SHA1withRSA" with "SHA256withRSA" in the call to Signature.getInstance().
Use a safer cryptography algorithm.
The following configuration file parameters affect checks for this warning class.
To report problems with this documentation, please visit https://support.codesecure.com/.