MD5加密

最新推荐文章于 2024-10-10 19:55:17 发布

转载最新推荐文章于 2024-10-10 19:55:17 发布 · 561 阅读

文章标签：

#加密 #string #exception #buffer #import #byte

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本文介绍了一个使用Java编写的简单程序，该程序可以计算文件的多种哈希值，包括MD5、SHA1、SHA-256、SHA-384和SHA-512。通过读取指定文件并应用不同的哈希算法，程序能够验证文件的完整性和一致性。

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import java.applet.*;
import java.io.*;
import java.security.*;

public class HashFile {
public static char[] hexChar = {'0', '1', '2', '3',
'4', '5', '6', '7',
'8', '9', 'a', 'b',
'c', 'd', 'e', 'f'};
public static void main(String[] args) throws
Exception {
String fileName = "D:\\programs\\Foxmail.rar";
String hashType = "MD5";
System.out.println(hashType + " == " +
getHash(fileName, hashType));
hashType = "SHA1";
System.out.println(hashType + " == " +
getHash(fileName, hashType));
hashType = "SHA-256";
System.out.println(hashType + " == " +
getHash(fileName, hashType));
hashType = "SHA-384";
System.out.println(hashType + " == " +
getHash(fileName, hashType));
hashType = "SHA-512";
System.out.println(hashType + " == " +
getHash(fileName, hashType));

}

public static String getHash(String fileName, String hashType) throws
Exception {
InputStream fis;
fis = new FileInputStream(fileName);
byte[] buffer = new byte[1024];
MessageDigest md5 = MessageDigest.getInstance(hashType);
int numRead = 0;
while ((numRead = fis.read(buffer)) > 0) {
md5.update(buffer, 0, numRead);
}
fis.close();
return toHexString(md5.digest());
}

public static String toHexString(byte[] b) {
StringBuilder sb = new StringBuilder(b.length * 2);
for (int i = 0; i < b.length; i++) {
sb.append(hexChar[(b[i] & 0xf0) >>> 4]);
sb.append(hexChar[b[i] & 0x0f]);
}
return sb.toString();
}
}