为什么 java.security.NoSuchProviderException 没有这样的提供者：BC？

jar（bcprov-jdk16-145.jar）已添加到项目中，Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider())已添加到类中，并且BouncyCastleProvider.PROVIDER_NAME确实返回“BC”但 AesFileIo.writeFile() 仍然抛出java.security.NoSuchProviderException No such provider: BC。有任何想法吗？

import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.ObjectOutputStream;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

public class AesFileIo {

    private static final String AES_ALGORITHM = "AES/CTR/NoPadding";
    private static final String PROVIDER = BouncyCastleProvider.PROVIDER_NAME;
    private static final byte[] AES_KEY_128 = { // Hard coded for now
        78, -90, 42, 70, -5, 20, -114, 103,
        -99, -25, 76, 95, -85, 94, 57, 54};
    private static final byte[] IV = { // Hard coded for now
        -85, -67, -5, 88, 28, 49, 49, 85,
        114, 83, -40, 119, -65, 91, 76, 108};
    private static final SecretKeySpec secretKeySpec =
            new SecretKeySpec(AES_KEY_128, "AES");
    private static final IvParameterSpec ivSpec = new IvParameterSpec(IV);

    public void AesFileIo() {
        Security.addProvider(new org.bouncycastle.jce.provider
                .BouncyCastleProvider());
    }

    public void writeFile(String fileName, String theFile) {
        try {
            Cipher cipher = Cipher.getInstance(AES_ALGORITHM, PROVIDER);
            cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivSpec);
            byte[] encrypted = cipher.doFinal(theFile.getBytes());
            ObjectOutputStream os = new ObjectOutputStream(
                new FileOutputStream(fileName));
            os.write(encrypted);
            os.flush();
            os.close();
        } catch (Exception e) {
            StackTraceElement se = new Exception().getStackTrace()[0];
            System.err.println(se.getFileName() + " " + se.getLineNumber()
                    + " " + e);
        }
    }
}

我对Android sdk不是很熟悉，但似乎android-sdk附带BouncyCastle提供商已添加到安全性中。

在PC环境下你只需手动添加即可，

Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

如果您有权访问policy文件中，只需添加一个条目，例如：

security.provider.5=org.bouncycastle.jce.provider.BouncyCastleProvider 

注意.5它等于已添加的提供者的序号。