Android解密错误
Android Decryption Error
我正在尝试在我的 Android 应用程序中加密和解密字符串,但我一直收到 InvalidKeyException 错误。
这是我的代码:
//生成密钥方法
public void generateKeys() {
Calendar cal = Calendar.getInstance();
Date now = cal.getTime();
cal.add(Calendar.YEAR, 25);
Date end = cal.getTime();
KeyPairGenerator kpg = null;
try {
kpg = KeyPairGenerator.getInstance("RSA", "AndroidKeyStore");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchProviderException e) {
e.printStackTrace();
}
try {
kpg.initialize(new KeyPairGeneratorSpec.Builder(context)
.setAlias(KEY_ALIAS)
.setStartDate(now)
.setEndDate(end)
.setSerialNumber(BigInteger.valueOf(1))
.setSubject(new X500Principal("CN=" + KEY_ALIAS))
.build());
} catch (InvalidAlgorithmParameterException e) {
e.printStackTrace();
}
KeyPair kp = kpg.generateKeyPair();
KeyStore ks = null;
try {
ks = KeyStore.getInstance("AndroidKeyStore");
ks.load(null);
Enumeration<String> aliases = ks.aliases();
} catch (KeyStoreException e) {
e.printStackTrace();
} catch (CertificateException e) {
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
KeyStore.Entry entry = null;
try {
entry = ks.getEntry(KEY_ALIAS, null);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (UnrecoverableEntryException e) {
e.printStackTrace();
} catch (KeyStoreException e) {
e.printStackTrace();
}
if (!(entry instanceof KeyStore.PrivateKeyEntry)) {
Log.e(LOG_TAG, "Not an instance of PrivateKeyEntry.");
}
else{
privKey = ((KeyStore.PrivateKeyEntry) entry).getPrivateKey();
pubKey = ((KeyStore.PrivateKeyEntry) entry).getCertificate().getPublicKey();
}
}
//加密方式
private String encryptString(String value){
byte[] encodedBytes = null;
try {
Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding", "AndroidOpenSSL");
cipher.init(Cipher.ENCRYPT_MODE, pubKey);
encodedBytes = cipher.doFinal(value.getBytes());
} catch (Exception e) {
e.printStackTrace();
}
return Base64.encodeToString(encodedBytes, Base64.DEFAULT);
}
//解密方法
private String decryptString(String value){
byte[] decodedBytes = null;
try {
Cipher c = Cipher.getInstance("RSA/ECB/PKCS1Padding", "AndroidOpenSSL");
c.init(Cipher.DECRYPT_MODE, privKey);
decodedBytes = c.doFinal(Base64.decode(value, Base64.DEFAULT));
} catch (Exception e) {
e.printStackTrace();
Log.e("Error", "Error = " + e);
return "SECURE_FAILURE";
}
return new String(decodedBytes);
}
//测试代码
generateKeys();
String encrypted = encryptString("Hello World");
Log.e("Encrypt", "encrypted = " + encrypted);
String decrypted = decryptString(encrypted);
Log.e("Decrypt", "decrypted = " + decrypted);
看起来加密工作正常,因为它打印出如下内容:
encrypted =
SbA2iWWKQbDL7NTA9xvtjD/viYDdpx9fLRYTSZ8UQzdBy3QLqzkswBY21ErH7FPza3vZys4E4PZw
uxaGkRz0aC0FLqsYlbpcJernGm5+D5lRcBOaZmgkNY9pMf0YP75cBbcJdcmb1rDaH40nCRDnEoXv
rGESJRqT6p0NMzlZqdd9KO3tqfExwgservAWxPNtRDBbMgE4I/09418jM5Ock5eayfOuv/STwEy6
Ecd56UjFH63h+gP6ed2aMDhBVeExMxvdloY+VnsAxS5Dkoc2GdaljtjRuPK48HQASoJK8EwAMNpz
但是当我尝试解密时出现以下错误:
java.security.InvalidKeyException: Need RSA private or public key
我不明白为什么会出现此异常?有人可以帮忙吗?
尝试使用不同的提供商,例如:
Cipher.getInstance("RSA/ECB/PKCS1Padding", "AndroidKeyStoreBCWorkaround");
这对我有用:
private Cipher getCipher() {
try {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) { // below android m
return Cipher.getInstance("RSA/ECB/PKCS1Padding", "AndroidOpenSSL"); // error in android 6: InvalidKeyException: Need RSA private or public key
}
else { // android m and above
return Cipher.getInstance("RSA/ECB/PKCS1Padding", "AndroidKeyStoreBCWorkaround"); // error in android 5: NoSuchProviderException: Provider not available: AndroidKeyStoreBCWorkaround
}
} catch(Exception exception) {
throw new RuntimeException("getCipher: Failed to get an instance of Cipher", exception);
}
}
删除提供商对我有用:
Cipher.getInstance("RSA/ECB/PKCS1Padding")
来自 Java docs:"This method traverses the list of registered security Providers, starting with the most preferred Provider. A new Cipher object encapsulating the CipherSpi implementation from the first Provider that supports the specified algorithm is returned."
我正在尝试在我的 Android 应用程序中加密和解密字符串,但我一直收到 InvalidKeyException 错误。
这是我的代码:
//生成密钥方法
public void generateKeys() {
Calendar cal = Calendar.getInstance();
Date now = cal.getTime();
cal.add(Calendar.YEAR, 25);
Date end = cal.getTime();
KeyPairGenerator kpg = null;
try {
kpg = KeyPairGenerator.getInstance("RSA", "AndroidKeyStore");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchProviderException e) {
e.printStackTrace();
}
try {
kpg.initialize(new KeyPairGeneratorSpec.Builder(context)
.setAlias(KEY_ALIAS)
.setStartDate(now)
.setEndDate(end)
.setSerialNumber(BigInteger.valueOf(1))
.setSubject(new X500Principal("CN=" + KEY_ALIAS))
.build());
} catch (InvalidAlgorithmParameterException e) {
e.printStackTrace();
}
KeyPair kp = kpg.generateKeyPair();
KeyStore ks = null;
try {
ks = KeyStore.getInstance("AndroidKeyStore");
ks.load(null);
Enumeration<String> aliases = ks.aliases();
} catch (KeyStoreException e) {
e.printStackTrace();
} catch (CertificateException e) {
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
KeyStore.Entry entry = null;
try {
entry = ks.getEntry(KEY_ALIAS, null);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (UnrecoverableEntryException e) {
e.printStackTrace();
} catch (KeyStoreException e) {
e.printStackTrace();
}
if (!(entry instanceof KeyStore.PrivateKeyEntry)) {
Log.e(LOG_TAG, "Not an instance of PrivateKeyEntry.");
}
else{
privKey = ((KeyStore.PrivateKeyEntry) entry).getPrivateKey();
pubKey = ((KeyStore.PrivateKeyEntry) entry).getCertificate().getPublicKey();
}
}
//加密方式
private String encryptString(String value){
byte[] encodedBytes = null;
try {
Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding", "AndroidOpenSSL");
cipher.init(Cipher.ENCRYPT_MODE, pubKey);
encodedBytes = cipher.doFinal(value.getBytes());
} catch (Exception e) {
e.printStackTrace();
}
return Base64.encodeToString(encodedBytes, Base64.DEFAULT);
}
//解密方法
private String decryptString(String value){
byte[] decodedBytes = null;
try {
Cipher c = Cipher.getInstance("RSA/ECB/PKCS1Padding", "AndroidOpenSSL");
c.init(Cipher.DECRYPT_MODE, privKey);
decodedBytes = c.doFinal(Base64.decode(value, Base64.DEFAULT));
} catch (Exception e) {
e.printStackTrace();
Log.e("Error", "Error = " + e);
return "SECURE_FAILURE";
}
return new String(decodedBytes);
}
//测试代码
generateKeys();
String encrypted = encryptString("Hello World");
Log.e("Encrypt", "encrypted = " + encrypted);
String decrypted = decryptString(encrypted);
Log.e("Decrypt", "decrypted = " + decrypted);
看起来加密工作正常,因为它打印出如下内容:
encrypted = SbA2iWWKQbDL7NTA9xvtjD/viYDdpx9fLRYTSZ8UQzdBy3QLqzkswBY21ErH7FPza3vZys4E4PZw uxaGkRz0aC0FLqsYlbpcJernGm5+D5lRcBOaZmgkNY9pMf0YP75cBbcJdcmb1rDaH40nCRDnEoXv rGESJRqT6p0NMzlZqdd9KO3tqfExwgservAWxPNtRDBbMgE4I/09418jM5Ock5eayfOuv/STwEy6 Ecd56UjFH63h+gP6ed2aMDhBVeExMxvdloY+VnsAxS5Dkoc2GdaljtjRuPK48HQASoJK8EwAMNpz
但是当我尝试解密时出现以下错误:
java.security.InvalidKeyException: Need RSA private or public key
我不明白为什么会出现此异常?有人可以帮忙吗?
尝试使用不同的提供商,例如:
Cipher.getInstance("RSA/ECB/PKCS1Padding", "AndroidKeyStoreBCWorkaround");
这对我有用:
private Cipher getCipher() {
try {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) { // below android m
return Cipher.getInstance("RSA/ECB/PKCS1Padding", "AndroidOpenSSL"); // error in android 6: InvalidKeyException: Need RSA private or public key
}
else { // android m and above
return Cipher.getInstance("RSA/ECB/PKCS1Padding", "AndroidKeyStoreBCWorkaround"); // error in android 5: NoSuchProviderException: Provider not available: AndroidKeyStoreBCWorkaround
}
} catch(Exception exception) {
throw new RuntimeException("getCipher: Failed to get an instance of Cipher", exception);
}
}
删除提供商对我有用:
Cipher.getInstance("RSA/ECB/PKCS1Padding")
来自 Java docs:"This method traverses the list of registered security Providers, starting with the most preferred Provider. A new Cipher object encapsulating the CipherSpi implementation from the first Provider that supports the specified algorithm is returned."