好的，所以当我加密任何东西时，假设在这种情况下是一个文件，用我的电脑。它可以很好地加密和解密所述文件。但是，如果用我的计算机加密文件，然后将其发送到我的 android 并运行我编写的相同解密代码，它将无法正确解密文件。它没有显示任何错误，但是文件显然没有正确解密。
所以我了解到 Bouncy CaSTLe 与 JVM/JDK 标准加密库有很大不同，所以我不能 100% 确定这是否是问题所在。然而，这是有道理的。问题是，如果是的话，我不知道如何在我的 android 上使用 JVM/JDK 库进行加密。我不想在我的计算机上过多地使用 Bouncy CaSTLe 库。
public static void encrypt(File source, File dest, String password){
try{
FileInputStream inFile = new FileInputStream(source.getPath());
FileOutputStream outFile = new FileOutputStream(dest.getPath());
byte[] salt = new byte[8], iv = new byte[16];
SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
KeySpec keySpec = new PBEKeySpec(password.toCharArray(), salt, 65536, 256);
SecretKey secretKey = factory.generateSecret(keySpec);
SecretKey secret = new SecretKeySpec(secretKey.getEncoded(), "AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, secret, new IvParameterSpec(iv));
byte[] input = new byte[64];
int bytesRead;
while((bytesRead = inFile.read(input)) != -1){
byte[] output = cipher.update(input, 0, bytesRead);
if(output != null){
outFile.write(output);
}
}
byte[] output = cipher.doFinal();
if(output != null){
outFile.write(output);
}
inFile.close();
outFile.flush();
outFile.close();
}catch(Exception e){
e.printStackTrace();
}
}
public static void decrypt(File source, File dest, String password){
try{
byte[] salt = new byte[8], iv = new byte[16];
SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
KeySpec keySpec = new PBEKeySpec(password.toCharArray(), salt, 65536, 256);
SecretKey tmp = factory.generateSecret(keySpec);
SecretKey secret = new SecretKeySpec(tmp.getEncoded(), "AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, secret, new IvParameterSpec(iv));
FileInputStream fis = new FileInputStream(source.getPath());
FileOutputStream fos = new FileOutputStream(dest.getPath());
byte[] in = new byte[64];
int read;
while((read = fis.read(in)) != -1){
byte[] output = cipher.update(in, 0, read);
if(output != null){
fos.write(output);
}
}
byte[] output = cipher.doFinal();
if(output != null){
fos.write(output);
}
fis.close();
fos.flush();
fos.close();
}catch(Exception e){
e.printStackTrace();
}
}
结果将是能够使用标准 JVM/JDK 加密库在我的计算机上加密任何文件，并且能够在我的 android 上解密同一个文件。
但是，如果除了 Bouncy CaSTLe 之外还有其他库可以与 android 一起使用，我欢迎提出想法。
最佳答案
我遇到过类似的问题。首先检查您的加密和解密设置是否正确。
如果这些没问题，那么您应该将加密文本转换为 Base64 或类似的编码。
然后在手机上先解码Base64编码，再解密文件。
出现此问题是因为某些字符不适合在媒体之间保存或传输。它们还会受到底层操作系统的影响。即使更改了一点，您的整个解密文本也会更改，这里可能就是这种情况
安卓代码
public static void decrypt(File source, File dest, String password){
try{
Base64InputStream fis = new Base64InputStream(new DataInputStream(new FileInputStream(source.getPath())), Base64.DEFAULT);
FileOutputStream fos = new FileOutputStream(dest.getPath());
byte[] salt = new byte[8], iv = new byte[16];
SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
KeySpec keySpec = new PBEKeySpec(password.toCharArray(), salt, 65536, 256);
SecretKey tmp = factory.generateSecret(keySpec);
SecretKey secret = new SecretKeySpec(tmp.getEncoded(), "AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, secret, new IvParameterSpec(iv));
byte[] in = new byte[64];
int read;
while((read = fis.read(in)) != -1){
byte[] output = cipher.update(in, 0, read);
if(output != null){
fos.write(output);
}
}
byte[] output = cipher.doFinal();
if(output != null){
fos.write(output);
}
fis.close();
fos.flush();
fos.close();
}catch(Exception e){
e.printStackTrace();
}
}
常规 JVM
public static void encrypt(File source, File dest, String password){
try{
FileInputStream inFile = new FileInputStream(source.getPath());
OutputStream outFile = Base64.getEncoder().wrap(new FileOutputStream(dest.getPath()));
byte[] salt = new byte[8], iv = new byte[16];
SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
KeySpec keySpec = new PBEKeySpec(password.toCharArray(), salt, 65536, 256);
SecretKey secretKey = factory.generateSecret(keySpec);
SecretKey secret = new SecretKeySpec(secretKey.getEncoded(), "AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, secret, new IvParameterSpec(iv));
byte[] input = new byte[64];
int bytesRead;
while((bytesRead = inFile.read(input)) != -1){
byte[] output = cipher.update(input, 0, bytesRead);
if(output != null){
outFile.write(output);
}
}
byte[] output = cipher.doFinal();
if(output != null){
outFile.write(output);
}
inFile.close();
outFile.flush();
outFile.close();
}catch(Exception e){
e.printStackTrace();
}
}
public static void decrypt(File source, File dest, String password){
try{
InputStream fis = Base64.getDecoder().wrap(new FileInputStream(source.getPath()));
//FileInputStream fis = new FileInputStream(source.getPath());
FileOutputStream fos = new FileOutputStream(dest.getPath());
byte[] salt = new byte[8], iv = new byte[16];
SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
KeySpec keySpec = new PBEKeySpec(password.toCharArray(), salt, 65536, 256);
SecretKey tmp = factory.generateSecret(keySpec);
SecretKey secret = new SecretKeySpec(tmp.getEncoded(), "AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, secret, new IvParameterSpec(iv));
byte[] in = new byte[64];
int read;
while((read = fis.read(in)) != -1){
byte[] output = cipher.update(in, 0, read);
if(output != null){
fos.write(output);
}
}
byte[] output = cipher.doFinal();
if(output != null){
fos.write(output);
}
fis.close();
fos.flush();
fos.close();
}catch(Exception e){
e.printStackTrace();
}
}
关于Java 加密不会在 Android 上解密，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/58724102/