# Security

Rules that flag potential security flaws.
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## HardCodedCryptoKey

Since: PMD 6.4.0

Priority: Medium (3)

Do not use hard coded values for cryptographic operations. Please store keys outside of source code.

This rule is defined by the following Java class: net.sourceforge.pmd.lang.java.rule.security.HardCodedCryptoKeyRule

Example(s):

    public class Foo {
        void good() {
            SecretKeySpec secretKeySpec = new SecretKeySpec(Properties.getKey(), "AES");
        }

        void bad() {
            SecretKeySpec secretKeySpec = new SecretKeySpec("my secret here".getBytes(), "AES");
        }
    }

Use this rule by referencing it:

    <rule ref="category/java/security.xml/HardCodedCryptoKey" />

## InsecureCryptoIv

Since: PMD 6.3.0

Priority: Medium (3)

Do not use hard coded initialization vector in cryptographic operations. Please use a randomly generated IV.

This rule is defined by the following Java class: net.sourceforge.pmd.lang.java.rule.security.InsecureCryptoIvRule

Example(s):

    public class Foo {
        void good() {
            SecureRandom random = new SecureRandom();
            byte iv[] = new byte[16];
            random.nextBytes(bytes);
        }

        void bad() {
            byte[] iv = new byte[] { 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, };
        }

        void alsoBad() {
            byte[] iv = "secret iv in here".getBytes();
        }
    }

Use this rule by referencing it:

    <rule ref="category/java/security.xml/InsecureCryptoIv" />