信息计算2019级2班16号吴盛盛

吴盛盛 · 发表于 2022-4-5 16:51:04

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吴盛盛 · 发表于 2022-4-5 20:53:07

import java.io.InputStream;
import java.io.OutputStream;
import java.security.MessageDigest;
import java.security.spec.AlgorithmParameterSpec;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.CipherOutputStream;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import com.spire.doc.*;
import java.io.IOException;
class TestAES {
Cipher ecipher;
Cipher dcipher;
public TestAES() {
try {
SecretKeySpec skey = new SecretKeySpec(
"9f265d42ab3c66d8f50a3a2e793a30c2".getBytes(), "AES");
this.setupCrypto(skey);
} catch (Exception e) {
e.printStackTrace();
}
}
public TestAES(String key) {
SecretKeySpec skey = new SecretKeySpec(getMD5(key), "AES");
this.setupCrypto(skey);
}
private void setupCrypto(SecretKey key) {
byte[] iv = new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
AlgorithmParameterSpec paramSpec = new IvParameterSpec(iv);
try {
ecipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
dcipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
// CBC requires an initialization vector
ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
} catch (Exception e) {
e.printStackTrace();
}
}
public void encrypt(InputStream in, OutputStream out) {
byte[] buf = new byte[1024];
try {
out = new CipherOutputStream(out, ecipher);
int numRead = 0;
while ((numRead = in.read(buf)) >= 0) {
out.write(buf, 0, numRead);
}
out.close();
} catch (java.io.IOException e) {
e.printStackTrace();
}
}
public String encrypt(String plaintext) {
try {
byte[] ciphertext = ecipher.doFinal(plaintext.getBytes("UTF-8"));
return byteToHex(ciphertext);
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
public void decrypt(InputStream in, OutputStream out) {
try {
byte[] buf = new byte[1024];
in = new CipherInputStream(in, dcipher);
// Read in the decrypted bytes and write the cleartext to out
int numRead = 0;
while ((numRead = in.read(buf)) >= 0) {
out.write(buf, 0, numRead);
}
out.close();
} catch (java.io.IOException e) {
e.printStackTrace();
}
}
public String decrypt(String hexCipherText) {
try {
String plaintext = new String(
dcipher.doFinal(hexToByte(hexCipherText)), "UTF-8");
return plaintext;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
public String decrypt(byte[] ciphertext) {
try {
String plaintext = new String(dcipher.doFinal(ciphertext), "UTF-8");
return plaintext;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
private static byte[] getMD5(String input) {
try {
byte[] bytesOfMessage = input.getBytes("UTF-8");
MessageDigest md = MessageDigest.getInstance("MD5");
return md.digest(bytesOfMessage);
} catch (Exception e) {
return null;
}
}
static final String HEXES = "0123456789ABCDEF";
public static String byteToHex(byte[] raw) {
if (raw == null) {
return null;
}
final StringBuilder hex = new StringBuilder(2 * raw.length);
for (final byte b : raw) {
hex.append(HEXES.charAt((b & 0xF0) >> 4)).append(
HEXES.charAt((b & 0x0F)));
}
return hex.toString();
}
public static byte[] hexToByte(String hexString) {
int len = hexString.length();
byte[] ba = new byte[len / 2];
for (int i = 0; i < len; i += 2) {
ba[i / 2] = (byte) ((Character.digit(hexString.charAt(i), 16) << 4) + Character
.digit(hexString.charAt(i + 1), 16));
}
return ba;
}
public static void main(String[] args) {
String str="SHIYUNPENG";
}
}
public class TextReader{
public static void main(String[] args) throws IOException {
Document doc = new Document("text.docx");//文件名
String str=doc.getText();
String MY="sdgs@#12ad##@2423sdf@$*((*)ghgs23846gsjgs&%$%#gsjfg%6646fhfhU52364926423648326jsfjbsdj%^%#$^%GHFJV"; //双方协商好的密钥
String aesStr=new TestAES(MY).encrypt(str);
System.out.println("AES加密后的字符串为:\n["+aesStr+"]\n");
//进行解密后的内容：
String de=new TestAES(MY).decrypt(aesStr);
System.out.println("AES解密后的内容为:\n["+de+"]");
}}

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信息计算2019级2班16号吴盛盛

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