我試圖使用AES算法生成加密文本在Android和iPhone平臺上,但問題是我們甚至使用相同的加密解密庫(AES-128)並使用相同的固定變量(Key,IV,模式),但是我得到了兩個不同的結果。iPhone和Android的加密方法
我很感激任何幫助。 :(
在下面的代碼呈現使用的加密和解密方法,
代碼版本的Android:
- 密鑰=「123456789ABCDEFG」;
- IV =「1111111111111111」;
- 純文本=「HelloThere」;
- Mode =「AES/CBC/NoPadding ;
代碼:
public class Crypto {
public static String encrypt(String seed, String cleartext) throws Exception {
byte[] rawKey = getRawKey(seed.getBytes());
byte[] result = encrypt(rawKey, cleartext.getBytes());
return toHex(result);
}
public static String decrypt(String seed, String encrypted) throws Exception {
byte[] rawKey = getRawKey(seed.getBytes());
byte[] enc = toByte(encrypted);
byte[] result = decrypt(rawKey, enc);
return new String(result);
}
private static byte[] getRawKey(byte[] seed) throws Exception {
KeyGenerator kgen = KeyGenerator.getInstance(「CBC」);
SecureRandom sr = SecureRandom.getInstance(「SHA1PRNG」);
sr.setSeed(seed);
kgen.init(128, sr); // 192 and 256 bits may not be available
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
return raw;
}
private static byte[] encrypt(byte[] raw, byte[] clear) throws Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, 「AES」);
Cipher cipher = Cipher.getInstance(「AES」);
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
byte[] encrypted = cipher.doFinal(clear);
return encrypted;
}
private static byte[] decrypt(byte[] raw, byte[] encrypted) throws Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, 「AES」);
Cipher cipher = Cipher.getInstance(「AES」);
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
byte[] decrypted = cipher.doFinal(encrypted);
return decrypted;
}
public static String toHex(String txt) {
return toHex(txt.getBytes());
}
public static String fromHex(String hex) {
return new String(toByte(hex));
}
public static byte[] toByte(String hexString) {
int len = hexString.length()/2;
byte[] result = new byte[len];
for (int i = 0; i < len; i++)
result[i] = Integer.valueOf(hexString.substring(2*i, 2*i+2), 16).byteValue();
return result;
}
public static String toHex(byte[] buf) {
if (buf == null)
return 「」;
StringBuffer result = new StringBuffer(2*buf.length);
for (int i = 0; i < buf.length; i++) {
appendHex(result, buf[i]);
}
return result.toString();
}
private final static String HEX = 「ABCDEF」;
private static void appendHex(StringBuffer sb, byte b) {
sb.append(HEX.charAt((b»4)&0x0f)).append(HEX.charAt(b&0x0f));
}
}
代碼版本的IPhone:
- (NSData *) transform:(CCOperation) encryptOrDecrypt data:(NSData *) inputData {
NSData* secretKey = [Cipher md5:cipherKey];
CCCryptorRef cryptor = NULL;
CCCryptorStatus status = kCCSuccess;
uint8_t iv[kCCBlockSizeAES128];
memset((void *) iv, 0x0, (size_t) sizeof(iv));
status = CCCryptorCreate(encryptOrDecrypt, kCCAlgorithmAES128, kCCOptionPKCS7Padding,
[secretKey bytes], kCCKeySizeAES128, iv, &cryptor);
if (status != kCCSuccess) {
return nil;
}
size_t bufsize = CCCryptorGetOutputLength(cryptor, (size_t)[inputData length], true);
void * buf = malloc(bufsize * sizeof(uint8_t));
memset(buf, 0x0, bufsize);
size_t bufused = 0;
size_t bytesTotal = 0;
status = CCCryptorUpdate(cryptor, [inputData bytes], (size_t)[inputData length],
buf, bufsize, &bufused);
if (status != kCCSuccess) {
free(buf);
CCCryptorRelease(cryptor);
return nil;
}
bytesTotal += bufused;
status = CCCryptorFinal(cryptor, buf + bufused, bufsize - bufused, &bufused);
if (status != kCCSuccess) {
free(buf);
CCCryptorRelease(cryptor);
return nil;
}
bytesTotal += bufused;
CCCryptorRelease(cryptor);
return [NSData dataWithBytesNoCopy:buf length:bytesTotal];
}
+ (NSData *) md5:(NSString *) stringToHash {
const char *src = [stringToHash UTF8String];
unsigned char result[CC_MD5_DIGEST_LENGTH];
CC_MD5(src, strlen(src), result);
return [NSData dataWithBytes:result length:CC_MD5_DIGEST_LENGTH];
}
我的一些參考資料:
http://automagical.rationalmind.net/2009/02/12/aes-interoperability-between-net-and-iphone/
http://code.google.com/p/aes-encryption-samples/wiki/HowToEncryptWithJava
請記住,字符串的getBytes()方法不確定每次都返回相同的字符串 –
您是否嘗試過通過此解密Java和Objective-C版本的輸出? http://www.everpassword.com/aes-encryptor –
你有沒有試過基本的plaintext.equals(解密(加密(明文)))測試?這兩種方法都返回true嗎? – Shark