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2024年1月12日发(作者：unix大作业文件系统)
（java）RSAECBPKCS1Padding算法加密和解密直接上代码：（有许多调试信息）[java]
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import .*;
import ;
import ty.*;
import .*;
import 64;
import ;
public class TestEncryp {
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
PrivateKey pri=getPriKey("/Users/cqx/bh_pkcs8_rsa_private_key_","RSA");
PublicKey pub=getPubKey("/Users/cqx/rsa_public_key_","RSA");
n("hahhahah11");
String str="我是需要传递的字符串";
byte[] estr=encrypt(es(),pub,2048, 11,"RSA/ECB/PKCS1Padding");
n(new String(estr));
n("hahhahah12");
byte[] dstr=decrypt(estr, pri, 2048, 11, "RSA/ECB/PKCS1Padding");
n(new String(dstr));
}
public static byte[] decrypt(byte[] encryptedBytes, PrivateKey privateKey, int keyLength,
int keyByteSize = keyLength / 8;
int decryptBlockSize = keyByteSize - reserveSize;
int nBlock = / keyByteSize;
ByteArrayOutputStream outbuf = null;
try {
Cipher cipher = tance(cipherAlgorithm);
(T_MODE, privateKey);
outbuf = new ByteArrayOutputStream(nBlock * decryptBlockSize);
for (int offset = 0; offset < ; offset += keyByteSize) {
int inputLen = - offset;
if (inputLen > keyByteSize) {
inputLen = keyByteSize;
}
byte[] decryptedBlock = l(encryptedBytes, offset, inputLen);
(decryptedBlock);
}
();
return Array();
} catch (Exception e) {
throw new Exception("DEENCRYPT ERROR:", e);
} finally {
try{
if(outbuf != null){
();
}
}catch (Exception e){
outbuf = null;
throw new Exception("CLOSE ByteArrayOutputStream ERROR:", e);
}
}
}
public static byte[] encrypt(byte[] plainBytes, PublicKey publicKey, int keyLength, int reserveSize, String cipherAlgorithm)
int keyByteSize = keyLength / 8;
int encryptBlockSize = keyByteSize - reserveSize;
int nBlock = / encryptBlockSize;
if (( % encryptBlockSize) != 0) {
nBlock += 1;
}
ByteArrayOutputStream outbuf = null;
try {
Cipher cipher = tance(cipherAlgorithm);
(T_MODE, publicKey);
outbuf = new ByteArrayOutputStream(nBlock * keyByteSize);
for (int offset = 0; offset < ; offset += encryptBlockSize) {
int inputLen = - offset;
if (inputLen > encryptBlockSize) {
inputLen = encryptBlockSize;
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inputLen = encryptBlockSize;
}
byte[] encryptedBlock = l(plainBytes, offset, inputLen);
(encryptedBlock);
}
();
return Array();
} catch (Exception e) {
throw new Exception("ENCRYPT ERROR:", e);
} finally {
try{
if(outbuf != null){
();
}
}catch (Exception e){
outbuf = null;
throw new Exception("CLOSE ByteArrayOutputStream ERROR:", e);
}
}
}
public static PrivateKey getPriKey(String privateKeyPath,String keyAlgorithm){
PrivateKey privateKey = null;
InputStream inputStream = null;
try {
if(inputStream==null){
n("hahhah1!");
}
inputStream = new FileInputStream(privateKeyPath);
n("hahhah2!");
privateKey = getPrivateKey(inputStream,keyAlgorithm);
n("hahhah3!");
} catch (Exception e) {
n("加载私钥出错!");
} finally {
if (inputStream != null){
try {
();
}catch (Exception e){
n("加载私钥,关闭流时出错!");
}
}
}
return privateKey;
}
public static PublicKey getPubKey(String publicKeyPath,String keyAlgorithm){
PublicKey publicKey = null;
InputStream inputStream = null;
try {
n("hahhahah8");
inputStream = new FileInputStream(publicKeyPath);
n("hahhahah9");
publicKey = getPublicKey(inputStream,keyAlgorithm);
n("hahhahah10");
} catch (Exception e) {
n("加载公钥出错!");
} finally {
if (inputStream != null){
try {
();
}catch (Exception e){
n("加载公钥,关闭流时出错!");
}
}
}
return publicKey;
}
public static PublicKey getPublicKey(InputStream inputStream, String keyAlgorithm) throws try {
BufferedReader br = new BufferedReader(new InputStreamReader(inputStream));
StringBuilder sb = new StringBuilder();
String readLine = null;
while ((readLine = ne()) != null) {
if ((0) == '-') {
continue;
} else {
(readLine);
('r');
}
}
X509EncodedKeySpec pubX509 = new X509EncodedKeySpec(decodeBase64(ng()));
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