java.security.KeyException：操作已被用户取消

Question

在我的应用程序中，我使用Class 2数字证书加密和解密密钥。密钥已成功加密，但在解密时会产生异常。此异常不是一直随机发生的。

我遇到异常的SecretKey是： DvhvSsG2AYDIWqoZcO687Q ==

异常是： java.security.KeyException：操作已被用户取消。

以下是我的代码：

生成SecretKey的函数：

public static String getSecretKey() {
    KeyGenerator kgen;
    String strSecretkey;
    try {
        kgen = KeyGenerator.getInstance("AES");
        kgen.init(128);
        SecretKey secretkey = kgen.generateKey();
        BASE64Encoder encode = new BASE64Encoder();
        strSecretkey = encode.encode(secretkey.getEncoded());
    } 
    catch (Exception e) {
        exceptionLogFile(e,null);
        e.printStackTrace();
        strSecretkey = "Error@SecretKeyGeneration: " + e.getMessage();
    }
    return strSecretkey;
}

加密SecretKey的功能：

public String Encrypt(String text, String pubkey) {
        String encryptedText;
        PublicKey publicKey = null;
        Cipher cipher;
        try {
            publicKey = getPublicKeyFromString(pubkey);
            if (publicKey!=null) {
                if(text != null){
                    byte[] plainText = text.getBytes();
                    cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
                    cipher.init(Cipher.ENCRYPT_MODE, publicKey);
                    encryptedText = bASE64Encoder.encode(cipher.doFinal(plainText));
                }
                else{
                    encryptedText =  "Error@Encrypt: Null data received";
                }
            }
            else{
                encryptedText =  "Error@Encrypt: Public Key not found";
            }
        } 
        catch (Exception e) {
            encryptedText =  "Error@Encrypt: "+ e.getMessage();
        }
        return encryptedText;

    }

解密密钥的功能：

public String Decrypt(String text, String pubkey) {
        PrivateKey privatekey = null;
        KeyStore keyStoreBrowser = null;
        String decryptedString;
        Cipher cipher = null;
        byte[] encryptText;
        try {
            keyStoreBrowser = initializeBrowserKeyStore();
            if(keyStoreBrowser != null) {
                privatekey = getPrivateKeyFromKeyStore(pubkey, keyStoreBrowser);
                if(privatekey != null) {
                    if(text != null){
                        encryptText = this.bASE64Decoder.decodeBuffer(text);
                        cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
                        cipher.init(Cipher.DECRYPT_MODE, privatekey);
                        decryptedString = new String(cipher.doFinal(encryptText));
                    }
                    else{
                        decryptedString =  "Error@Decrypt: Null data received to decrypt.";
                    }
                }
                else{
                    printMessageToConsole("Private is null");
                    decryptedString =  "Error@Decrypt: Private Key Not Found.";
                }
            }
            else{
                printMessageToConsole("KeyStore  not found");
                decryptedString =  "Error@Decrypt: KeyStore is null.";
            }
        }
        catch (Exception e) {
            decryptedString = "Error@Decrypt:"+ e.getMessage();
        }
        return decryptedString;
    }

获取私钥表单密钥库的函数：

private PrivateKey getPrivateKeyFromKeyStore(String pubkey,KeyStore browser) {
        PrivateKey privateKey = null;
        String pubKey1 = "";
        printMessageToConsole("Inside Get Private Key" );

        if (browser != null) {
            printMessageToConsole("Checking Browser Key Store keys for : " + browserName);
            try {
                Field spiField = KeyStore.class.getDeclaredField("keyStoreSpi");
                spiField.setAccessible(true);
                KeyStoreSpi spi = (KeyStoreSpi) spiField.get(browser);
                Field entriesField = spi.getClass().getSuperclass().getDeclaredField("entries");
                entriesField.setAccessible(true);
                @SuppressWarnings("rawtypes")
                Collection entries = (Collection) entriesField.get(spi);
                for (Object entry : entries) {
                    String alias = (String) invokeGetter(entry, "getAlias");
                    X509Certificate[] certificateChain = (X509Certificate[]) invokeGetter(entry, "getCertificateChain");
                    for (X509Certificate current : certificateChain) {
                        pubKey1 = this.bASE64Encoder.encode(current.getPublicKey().getEncoded());
                        if (pubkey.equals(pubKey1) && !pubkey.equals("")) {
                            privateKey = (PrivateKey) invokeGetter(entry,"getPrivateKey");
                            printMessageToConsole("Private Key is " + privateKey.toString());
                            printMessageToConsole("Private Key Found from Browser");
                            return privateKey;
                        }
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
                return null;
            }

        }
        return privateKey;
    }