JAVA和PYTHON中的SHA256加密产生了不同的结果

Question

我希望您能帮助我理解为什么我在JAVA和PYTHON中的SHA256加密函数不能产生结果(1位数的差异，在PYTHON中多出一位数(：

要加密的哈希为："thisistest">
Java结果为：a7c96262c21db9a06fd49e307d694fd95f624569f9b35bb3ffacd88044f9787
Python结果为：a7c96262c21db9a06fd49e307d694fd95f624569f9b35bb3ffacd880440f9787

Python代码：

import hashlib
def encrypt_string(hash_string):
sha_signature = 
hashlib.sha256(hash_string.encode()).hexdigest()
return sha_signature

hash_string = "thisisatest"
print(encrypt_string(hash_string), end="")

Java代码：

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class OpenAPIPasswordEncryptor1 {

private static MessageDigest sha256;
// generated password is stored encrypted (using also user name for hashing)
public synchronized static String encrypt(String hash) {
try {
StringBuilder builder = new StringBuilder();
builder.append(hash);
// first time , encrypt user name , password and static key
String encryptedCredentials = encryptionIterator(builder.toString());
return encryptedCredentials;
} 
catch (Exception e) {
e.printStackTrace();
}
return "";
}
private static String encryptionIterator(String content) {
try {
sha256 = MessageDigest.getInstance("SHA-256");
// append the static key to each iteration
byte[] passBytes = (content).getBytes();
sha256.reset();
byte[] digested = sha256.digest(passBytes);
StringBuffer sb = new StringBuffer();
for (int i = 0; i < digested.length; i++) {
sb.append(Integer.toHexString(0xff & digested[i]));
}
return sb.toString();
} catch (NoSuchAlgorithmException ex) {
ex.printStackTrace();
}
return "";
}
// generate password for developers
public static void main(String[] args) {
String hash = "thisisatest";
String encrypt = encrypt(hash);
System.out.println("Your Password Is '" + encrypt + "'");
}
}

Answer 1

问题是，如果(无符号(字节值小于或等于15，Integer.toHexString(int)会删除前导零。作为一个快速解决方法，您可以使用以下方法：

sb.append(String.format("%02x", 0xff & digested[i]));

尽管更有效的实现当然是可能的。

要在Python中产生相同的错误，请使用以下命令：

def encrypt_string(hash_string):
sha_signature = hashlib.sha256(hash_string.encode()).digest()
return "".join(["{:x}".format(b) for b in sha_signature])