java代码实现python2中aes加密经历

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背景：

因项目需要，需要将一个python2编写的aes加密方式改为java实现。

1.源python2实现

def turnMd5(str): <略>

2.经历

1. 我只有python3的环境，因使用到

Crypto这个package的很难安装上去，经过多种尝试，使用pycryptodome替代，故需要修改部分代码

2. 改成python3的文件

from Crypto.Cipher import AES
from binascii import b2a_hex, a2b_hex
import hashlib
import urllibclass aesCrypt():
def __init__(self, undealKey):
key = turnMd5(undealKey)
print(undealKey)
dealKey = dealKeyAndIV(key.lower()) self.key = dealKey
# self.iv = iv
self.mode = AES.MODE_ECB
self.BS = AES.block_size
# 补位
self.pad = lambda s: s + (self.BS - len(s) % self.BS) * chr(self.BS - len(s) % self.BS)
self.unpad = lambda s: s[0:-ord(s[-1])] def encrypt(self, text):
text = self.pad(text)
#finalkey=bytes([239,159,125,206,247,119,225,116,254,91,100,130,255,144,207,70])
cryptor = AES.new(bytes(self.key), self.mode)
# 目前AES-128 足够目前使用
#ss=bytes([67, 122, 99, 115, 81, 111, 68, 112, 67, 47, 67, 75, 48, 108, 98, 90, 99, 68, 47, 115, 88, 87, 52, 65, 43, 105, 119, 83, 72, 122, 88, 109, 55, 110, 98, 54, 102, 85, 89, 84, 56, 89, 117, 120, 102, 79, 110, 78, 70, 69, 120, 104, 97, 48, 68, 115, 83, 112, 89, 85, 84, 57, 49, 98, 113, 66, 120, 77, 107, 108, 52, 74, 105, 99, 72, 56, 49, 112, 105, 71, 106, 116, 103, 77, 87, 69, 71, 57, 43, 52, 69, 120, 54, 86, 82, 56, 56, 51, 102, 88, 74, 52, 112, 86, 117, 110, 120, 68, 117, 68, 100, 56, 53, 100, 109, 109, 88, 82, 106, 110, 48, 118, 107, 99, 115, 105, 89, 102, 97, 51, 110, 122, 72, 85, 122, 54, 67, 107, 55, 74, 85, 109, 115, 49, 73, 79, 99, 78, 76, 86, 66, 53, 87, 110, 53, 110, 106, 68, 76, 83, 65, 70, 114, 84, 106, 71, 68, 87, 110, 73, 69, 61, 4, 4, 4, 4])
#ss=text.encode()
#print(a2b_hex(ss))
#print(a2b_hex(ss))
ciphertext = cryptor.encrypt(text.encode("utf-8"))
# 把加密后的字符串转化为16进制字符串
return b2a_hex(ciphertext) # 解密后，去掉补足的空格用strip() 去掉
def decrypt(self, text):
cryptor = AES.new(self.key, self.mode)
plain_text = cryptor.decrypt(a2b_hex(text))
return self.unpad(plain_text.rstrip('\0'))def turnHex(character):
value = ord(character)
# print value
temp = value - 48
if value - 48 > 9:
if (value - 97 <= 5) & (value - 97 >= 0):
temp = value - 87
return tempdef dealKeyAndIV(undealKey):
flag = 0
result=[]
# debugPrint 'len=',len(undealKey)/2
while flag < len(undealKey)/2:
characterH = undealKey[flag*2]
# debugPrint characterH
highBit = turnHex(characterH) * 16
# debugPrint highBit
characterL = undealKey[flag*2+1]
# debugPrint characterL
lowBit = turnHex(characterL)
# debugPrint lowBit
ascValue = highBit+lowBit
# debugPrint ascValue
result.append(ascValue)
# debugPrint result
flag += 1
# print '-------'
return resultdef turnMd5(str):
m2 = hashlib.md5()
data = str.encode(encoding="utf-8")
m2.update(data)
return m2.hexdigest()

改写java程序

private static byte[] pading(String str){
byte[] strBs=str.getBytes();
int n=strBs.length/16;
byte[] pading=new byte[16*(n+1)];
System.arraycopy(strBs, 0, pading, 0, strBs.length);
//不足16位的进行补足
int len=16 - str.length()%16;
for(int i=strBs.length;i<pading.length;i++){
pading[i]=(byte)len;
}
return pading;
} public static String bytesToHexString(byte[] src){
StringBuilder stringBuilder = new StringBuilder("");
if (src == null || src.length <= 0) {
return null;
}
for (int i = 0; i < src.length; i++) {
int v = src[i] & 0xFF;
String hv = Integer.toHexString(v);
if (hv.length() < 2) {
stringBuilder.append(0);
}
stringBuilder.append(hv);
}
return stringBuilder.toString();
} public static String MD5Encode(String source, String encoding, boolean uppercase) {
String result = null;
try {
result = source;
// 获得MD5摘要对象
MessageDigest messageDigest = MessageDigest.getInstance("MD5");
// 使用指定的字节数组更新摘要信息
messageDigest.update(result.getBytes(encoding));
// messageDigest.digest()获得16位长度
result = bytesToHexString(messageDigest.digest()); } catch (Exception e) {
e.printStackTrace();
}
return uppercase ? result.toUpperCase() : result;
} public static Integer turnHex(char c){
int ret=0;
switch(c){
case '0':return 0;
case '1':return 1;
case '2':return 2;
case '3':return 3;
case '4':return 4;
case '5':return 5;
case '6':return 6;
case '7':return 7;
case '8':return 8;
case '9':return 9;
case 'a':return 10;
case 'b':return 11;
case 'c':return 12;
case 'd':return 13;
case 'e':return 14;
case 'f':return 15;
}
return ret;
} private static byte[] dealKeyAndIV(String str){
byte[] keys=new byte[16];
int flag = 0;
while(flag < str.length()/2){
char characterH =str.charAt(flag*2);
int highBit = turnHex(characterH) * 16;
char characterL = str.charAt(flag*2+1);
int lowBit = turnHex(characterL);
int ascValue = highBit+lowBit;
keys[flag]=(byte) ascValue;
//System.out.println(ascValue);
flag += 1;
}
return keys;
} public static String encrypt() throws Exception {
try {
String data = "CzcsQoDpC/CK0lbZcD/sXW4A+iwSHzXm7nb6fUYT8YuxfOnNFExha0DsSpYUT91bqBxMkl4JicH81piGjtgMWEG9+4Ex6VR883fXJ4pVunxDuDd85dmmXRjn0vkcsiYfa3nzHUz6Ck7JUms1IOcNLVB5Wn5njDLSAFrTjGDWnIE=";
String key = "IMgzwYRjA3sZgiXl";
String md5key=MD5Encode(key,"utf-8",false); //'ef9f7dcef777e174fe5b6482ff90cf46' //String finalKey = dealKeyAndIV(md5key);
//System.out.println(finalKey.length());
//System.out.println("c3afc29f7dc38ec3b777c3a174c3be5b64c282c3bfc290c38f46".length());
//String ss=bytesToHexString(finalKey.getBytes());//b'c3afc29f7dc38ec3b777c3a174c3be5b64c282c3bfc290c38f46' Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding");
int blockSize = cipher.getBlockSize();
byte[] plaintext=pading(data);
/* byte[] dataBytes = data.getBytes();
int plaintextLength = dataBytes.length;
if (plaintextLength % blockSize != 0) {
plaintextLength = plaintextLength + (blockSize - (plaintextLength % blockSize));
} byte[] plaintext = new byte[plaintextLength];
System.arraycopy(dataBytes, 0, plaintext, 0, dataBytes.length);*/
byte[] keys=dealKeyAndIV(md5key);
// byte[] keys=new byte[]{(byte)239,(byte)159,125,(byte)206,(byte)247,119,(byte)225,116,(byte)254,91,100,(byte)130,(byte)255,(byte)144,(byte)207,70};
SecretKeySpec keyspec = new SecretKeySpec(keys, "AES");
cipher.init(Cipher.ENCRYPT_MODE, keyspec);
//byte[] bb=new byte[]{67, 122, 99, 115, 81, 111, 68, 112, 67, 47, 67, 75, 48, 108, 98, 90, 99, 68, 47, 115, 88, 87, 52, 65, 43, 105, 119, 83, 72, 122, 88, 109, 55, 110, 98, 54, 102, 85, 89, 84, 56, 89, 117, 120, 102, 79, 110, 78, 70, 69, 120, 104, 97, 48, 68, 115, 83, 112, 89, 85, 84, 57, 49, 98, 113, 66, 120, 77, 107, 108, 52, 74, 105, 99, 72, 56, 49, 112, 105, 71, 106, 116, 103, 77, 87, 69, 71, 57, 43, 52, 69, 120, 54, 86, 82, 56, 56, 51, 102, 88, 74, 52, 112, 86, 117, 110, 120, 68, 117, 68, 100, 56, 53, 100, 109, 109, 88, 82, 106, 110, 48, 118, 107, 99, 115, 105, 89, 102, 97, 51, 110, 122, 72, 85, 122, 54, 67, 107, 55, 74, 85, 109, 115, 49, 73, 79, 99, 78, 76, 86, 66, 53, 87, 110, 53, 110, 106, 68, 76, 83, 65, 70, 114, 84, 106, 71, 68, 87, 110, 73, 69, 61, 4, 4, 4, 4};
byte[] encrypted = cipher.doFinal(plaintext);
return bytesToHexString(encrypted);
//return new sun.misc.BASE64Encoder().encode(encrypted); } catch (Exception e) {
e.printStackTrace();
return null;
}
}