ECDSA
例如微软产品的序列号的验证算法。
Elliptic Curve Digital Signature Algorithm,椭圆曲线数字签名算法。
速度快,强度高,签名短
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密钥长度 112~571 默认 256
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NONEwithECDSA 签名长度:128 实现方:JDK/BC
RIPEMD160withECDSA 签名长度:160 实现方:BC
SHA1withECDSA 签名长度:160 实现方:JDK/BC
SHA224withECDSA 签名长度:224 实现方:BC
SHA384withECDSA 签名长度:384 实现方:JDK/BC
SHA512withECDSA 签名长度:512 实现方:JDK/BC
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代码:
1 package ECDSA; 2 3 import com.sun.org.apache.xerces.internal.impl.dv.util.HexBin; 4 5 import java.security.*; 6 import java.security.interfaces.ECPrivateKey; 7 import java.security.interfaces.ECPublicKey; 8 import java.security.spec.PKCS8EncodedKeySpec; 9 import java.security.spec.X509EncodedKeySpec; 10 11 public class Ecdsa { 12 private static String src = "hello berber" ; 13 public static void mainString []args){ 14 jdkECDSA); 15 } 16 public static void jdkECDSA){ 17 // 1.初始化密钥 18 try{ 19 KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance"EC"); 20 keyPairGenerator.initialize256); 21 KeyPair keyPair = keyPairGenerator.generateKeyPair) ; 22 ECPublicKey ecPublicKey = ECPublicKey)keyPair.getPublic) ; 23 ECPrivateKey ecPrivateKey = ECPrivateKey)keyPair.getPrivate) ; 24 // 执行签名 25 PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpececPrivateKey.getEncoded)); 26 KeyFactory keyFactory = KeyFactory.getInstance"EC") ; 27 PrivateKey privateKey = keyFactory.generatePrivatepkcs8EncodedKeySpec) ; 28 Signature signature = Signature.getInstance"SHA1withECDSA"); 29 signature.initSignprivateKey); 30 signature.updatesrc.getBytes)); 31 byte []arr = signature.sign); 32 System.out.println"jdk ecdsa sign :"+ HexBin.encodearr)); 33 // 验证签名 34 X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpececPublicKey.getEncoded)); 35 keyFactory = KeyFactory.getInstance"EC"); 36 PublicKey publicKey = keyFactory.generatePublicx509EncodedKeySpec); 37 signature = Signature.getInstance"SHA1withECDSA"); 38 signature.initVerifypublicKey); 39 signature.updatesrc.getBytes)); 40 boolean bool = signature.verifyarr); 41 System.out.println"jdk ecdsa verify:"+bool); 42 }catchException e){ 43 44 } 45 } 46 }