找不到任何支持AES / GCM / NoPadding的提供商

Question

We are trying to do encryption supporting AES/GCM/NoPadding in java 7 getting below exception.

Cannot find any provider supporting AES/GCM/NoPadding

Code sample for generating cipher instance is below.

SecretKeySpec eks = new SecretKeySpec(k, "AES");
Cipher c = Cipher.getInstance("AES/GCM/NoPadding");
c.init(Cipher.ENCRYPT_MODE, eks, new GCMParameterSpec(128, iv));

Answer 1

This cipher is not supported by Java 7 SE ( exception for Solaris ).

public static void main(String[] args) throws Exception {
    for (Provider provider : Security.getProviders()) {
        for (Map.Entry<Object, Object> entry : provider.entrySet()) {
            if (((String) entry.getValue()).contains("GCM")) {
                System.out.printf("key: [%s]  value: [%s]%n",
                    entry.getKey(),
                    entry.getValue());
            }
        }
    }
}

You might have a look at Bouncy Castle as service provider in that case.

Small snippet for using Bouncycastle.

1. download bcprov-jdk15on-154.jar from http://www.bouncycastle.org/latest_releases.html

2. register the service provider in your code

    Security.addProvider(new BouncyCastleProvider()); 

3. then you are able to use the cipher as (the paramter "BC" specifies to use Bounce Castle as service provider, can be omitted if there is no other provider for the same cipher)

    Cipher c = Cipher.getInstance("AES/GCM/NOPADDING", "BC"); 

Java 8 support the cipher out of the box with

Cipher c = Cipher.getInstance("AES/GCM/NOPADDING");