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我正在使用 cipher java 进行密码解密逻辑。在那，同时使用cipher.getInstance("RSA/NONE/NoPadding"). 我收到以下异常：NoSuchAlgorithm.

相同的代码在我的本地 jboss 服务器设置中有效，但在 IBM-WAS 服务器设置中无效。本地 jboss 服务器和 WAS 服务器有什么区别吗？

public static String decrypt(String encrypted, KeyPair keys) {
    Cipher dec;
    try {

        dec = Cipher.getInstance("RSA/NONE/NoPadding"); //Exception raised
        dec.init(Cipher.DECRYPT_MODE, keys.getPrivate());

    } catch (GeneralSecurityException e) {
        throw new RuntimeException("RSA algorithm  not supported", e);//Catch block executed
    }
}

日志： 

R Caused by: java.security.NoSuchAlgorithmException: Cannot find any provider supporting RSA/NONE/NoPadding
    at java.lang.Throwable.<init>(Throwable.java:80)
    at javax.crypto.Cipher.getInstance(Unknown Source)
    at com.lsi.utils.JCryptionUtil.decrypt(JCryptionUtil.java:59)
    Caused by: java.security.NoSuchAlgorithmException: Mode: NONE not implemented
    at com.ibm.crypto.provider.RSA.engineSetMode(Unknown Source)
    at javax.crypto.Cipher$a_.a(Unknown Source)

**Jar**

Jce.jar - javax.crypto.Cipher;
bcprov-jdk15-140.jar (External security provider jar)
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1 回答 1

3

Oracle security provider supports only ECB mode instead of NONE. Algorithms are provided by security providers, registered to JVM and their names up to provider creators.

In situation, when you cannot know beforehand, which security providers installed in the execution environment, you may try different options. For example, like this:

Cipher cipher = null;
try {
    cipher = Cipher.getInstance("RSA/ECB/NoPadding");
} catch (NoSuchAlgorithmException e) {
    cipher = Cipher.getInstance("RSA/NONE/NoPadding");
}

Another possibility is to check installed providers on startup an make decision about algorithms

for (Provider provider : Security.getProviders()) {
    for (Provider.Service service : provider.getServices()) {
        System.out.println(provider.getName() + ": " + service.getType() + "." + service.getAlgorithm());
        // check these values and find a best match
    }
}
于 2014-12-04T14:32:01.490 回答