ECB mode is insecure

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Metadata

ID: java-security/cipher-padding-oracle

Language: Java

Severity: Error

Category: Security

Description

CBC mode used with PKCS5Padding is susceptible to padding attacks. Datadog recommends using AES/GCM/NoPadding.

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Non-Compliant Code Examples

class MyClass {

    public void test1() {
        Cipher c = Cipher.getInstance("AES/CBC/PKCS5Padding");
        c.init(Cipher.ENCRYPT_MODE, k, iv);
        byte[] cipherText = c.doFinal(plainText);
    }

    public void test2() {
        Cipher c = javax.crypto.Cipher.getInstance("AES/CBC/PKCS5Padding");
        c.init(Cipher.ENCRYPT_MODE, k, iv);
        byte[] cipherText = c.doFinal(plainText);
    }
}

Compliant Code Examples

class MyClass {

    public void test() {
        Cipher c = Cipher.getInstance("AES/GCM/NoPadding");
        c.init(Cipher.ENCRYPT_MODE, k, iv);
        byte[] cipherText = c.doFinal(plainText);
    }

    public void test2() {
        Cipher c = javax.crypto.Cipher.getInstance("AES/GCM/NoPadding");
        c.init(Cipher.ENCRYPT_MODE, k, iv);
        byte[] cipherText = c.doFinal(plainText);
    }
}