标签：java getInstance localStringBuffer DES 加解密 signature import Java security
项目结构
des代码
package rsa_code;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import utils.Base64Utils;
public class rsa {
private static String src = "cakin security rsa";
public static void main(String[] args) {
jdkRSA();
}
public static void jdkRSA() {
try {
//1.初始化密钥
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
keyPairGenerator.initialize(512);
KeyPair keyPair = keyPairGenerator.generateKeyPair();
RSAPublicKey rsaPublicKey = (RSAPublicKey)keyPair.getPublic();
RSAPrivateKey rsaPrivateKey = (RSAPrivateKey)keyPair.getPrivate();
//2.执行签名
PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(rsaPrivateKey.getEncoded());
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
Signature signature = Signature.getInstance("MD5withRSA");
signature.initSign(privateKey);
signature.update(src.getBytes());
byte[] result = signature.sign();
System.out.println("jdk rsa sign : " + Base64Utils.encode(result));
//3.验证签名
X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(rsaPublicKey.getEncoded());
keyFactory = KeyFactory.getInstance("RSA");
PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);
signature = Signature.getInstance("MD5withRSA");
signature.initVerify(publicKey);
signature.update(src.getBytes());
boolean bool = signature.verify(result);
System.out.println("jdk rsa verify : " + bool);
} catch (Exception e) {
e.printStackTrace();
}
}
}RSA代码
package rsa_code;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import utils.Base64Utils;
public class rsa {
private static String src = "cakin security rsa";
public static void main(String[] args) {
jdkRSA();
}
public static void jdkRSA() {
try {
//1.初始化密钥
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
keyPairGenerator.initialize(512);
KeyPair keyPair = keyPairGenerator.generateKeyPair();
RSAPublicKey rsaPublicKey = (RSAPublicKey)keyPair.getPublic();
RSAPrivateKey rsaPrivateKey = (RSAPrivateKey)keyPair.getPrivate();
//2.执行签名
PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(rsaPrivateKey.getEncoded());
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
Signature signature = Signature.getInstance("MD5withRSA");
signature.initSign(privateKey);
signature.update(src.getBytes());
byte[] result = signature.sign();
System.out.println("jdk rsa sign : " + Base64Utils.encode(result));
//3.验证签名
X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(rsaPublicKey.getEncoded());
keyFactory = KeyFactory.getInstance("RSA");
PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);
signature = Signature.getInstance("MD5withRSA");
signature.initVerify(publicKey);
signature.update(src.getBytes());
boolean bool = signature.verify(result);
System.out.println("jdk rsa verify : " + bool);
} catch (Exception e) {
e.printStackTrace();
}
}
}工具类
package utils;
import java.io.UnsupportedEncodingException;
public class Base64Utils {
private static char[] base64EncodeChars = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/' };
private static byte[] base64DecodeChars = { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1 };
public static String encode(byte[] paramArrayOfByte)
{
StringBuffer localStringBuffer = new StringBuffer();
int i = paramArrayOfByte.length;
int j = 0;
while (j < i)
{
int k = paramArrayOfByte[(j++)] & 0xFF;
if (j == i)
{
localStringBuffer.append(base64EncodeChars[(k >>> 2)]);
localStringBuffer.append(base64EncodeChars[((k & 0x3) << 4)]);
localStringBuffer.append("==");
break;
}
int m = paramArrayOfByte[(j++)] & 0xFF;
if (j == i)
{
localStringBuffer.append(base64EncodeChars[(k >>> 2)]);
localStringBuffer.append(base64EncodeChars[((k & 0x3) << 4 | (m & 0xF0) >>> 4)]);
localStringBuffer.append(base64EncodeChars[((m & 0xF) << 2)]);
localStringBuffer.append("=");
break;
}
int n = paramArrayOfByte[(j++)] & 0xFF;
localStringBuffer.append(base64EncodeChars[(k >>> 2)]);
localStringBuffer.append(base64EncodeChars[((k & 0x3) << 4 | (m & 0xF0) >>> 4)]);
localStringBuffer.append(base64EncodeChars[((m & 0xF) << 2 | (n & 0xC0) >>> 6)]);
localStringBuffer.append(base64EncodeChars[(n & 0x3F)]);
}
return localStringBuffer.toString();
}
public static byte[] decode(String paramString) throws UnsupportedEncodingException {
StringBuffer localStringBuffer = new StringBuffer();
byte[] arrayOfByte = paramString.getBytes("US-ASCII");
int i = arrayOfByte.length;
int j = 0;
while (j < i)
{
int k;
do
{
k = base64DecodeChars[arrayOfByte[(j++)]];
} while ((j < i) && (k == -1));
if (k == -1) {
break;
}
int m;
do
{
m = base64DecodeChars[arrayOfByte[(j++)]];
} while ((j < i) && (m == -1));
if (m == -1) {
break;
}
localStringBuffer.append((char)(k << 2 | (m & 0x30) >>> 4));
int n;
do
{
n = arrayOfByte[(j++)];
if (n == 61) {
return localStringBuffer.toString().getBytes("ISO-8859-1");
}
n = base64DecodeChars[n];
} while ((j < i) && (n == -1));
if (n == -1) {
break;
}
localStringBuffer.append((char)((m & 0xF) << 4 | (n & 0x3C) >>> 2));
int i1;
do
{
i1 = arrayOfByte[(j++)];
if (i1 == 61) {
return localStringBuffer.toString().getBytes("ISO-8859-1");
}
i1 = base64DecodeChars[i1];
} while ((j < i) && (i1 == -1));
if (i1 == -1) {
break;
}
localStringBuffer.append((char)((n & 0x3) << 6 | i1));
}
return localStringBuffer.toString().getBytes("ISO-8859-1");
}
}
标签：java,getInstance,localStringBuffer,DES,加解密,signature,import,Java,security 来源： https://www.cnblogs.com/dgwblog/p/14204299.html
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