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一.ECDSA:

   椭圆曲线数字签名算法（ECDSA）是使用椭圆曲线密码（ECC）对数字签名算法（DSA）的模拟

二.模型

模型与 dsa ， rsa  一致 

三.具体的算法（注意!!!只有jdk1.7之后才提供了 ECDSA 算法的支持）

算法	密钥长度	默认长度	签名长度	实现的方
NONEwithECDSA	112-571	256	128	JDK/BC
RIPEMD160withECDSA	同上	256	160	BC
SHA1withECDSA	...	256	160	JDK/BC
SHA224withECDSA	...	256	224	BC
SHA256withECDSA	...	256	256	JDK/BC
SHA384withECDSA	...	256	384	JDK/BC
SHA512withECDSA	...	256	512	JDK/BC

四.优点：

速度快，强度高，签名短

五.具体的实现（java）:

import java.security.InvalidKeyException;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.SignatureException;
import java.security.interfaces.ECPrivateKey;
import java.security.interfaces.ECPublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

import org.apache.commons.codec.binary.Base64;

public class ECDSA {

static String src = "欧阳草帽";
	
	public static void main(String[] args) throws Exception {
		// TODO Auto-generated method stub
		
		// 获取公钥、私钥  
		KeyPair keyPair = getKeyPair();
		
		ECPublicKey ecPublicKey = getRSPublicKey(keyPair);
		ECPrivateKey ecPrivateKey = getESAPrivateKey(keyPair);
		byte [] publicKeyEnc = ecPublicKey.getEncoded();   // 公钥
		byte [] privateKeyEnc = ecPrivateKey.getEncoded(); //私钥
		
		//执行签名 
		byte[] result = sign(privateKeyEnc);
		System.out.println("签名后的数据："+Base64.encodeBase64String(result));
		
		//验证签名
		boolean ok = verify(publicKeyEnc, result);
		System.out.println("签名验证的结果：" + ok);
	}
	/**
	 * 验证签名
	 * @param publicKeyEnc
	 * @param result
	 * @return
	 * @throws NoSuchAlgorithmException
	 * @throws InvalidKeySpecException
	 * @throws InvalidKeyException
	 * @throws SignatureException
	 */
	public static boolean verify(byte[] publicKeyEnc, byte[] result)
			throws NoSuchAlgorithmException, InvalidKeySpecException,
			InvalidKeyException, SignatureException {
		X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(publicKeyEnc);
		KeyFactory keyFactory = KeyFactory.getInstance("EC");
		PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);
		Signature signature = Signature.getInstance("SHA1withECDSA");
		signature.initVerify(publicKey);
		signature.update(src.getBytes());
		boolean ok = signature.verify(result);  // 验证结果 
		return ok;
	}

	/**
	 * 执行签名
	 * @param privateKeyEnc
	 * @return
	 * @throws NoSuchAlgorithmException
	 * @throws InvalidKeySpecException
	 * @throws InvalidKeyException
	 * @throws SignatureException
	 */
	public static byte[] sign(byte[] privateKeyEnc)
			throws NoSuchAlgorithmException, InvalidKeySpecException,
			InvalidKeyException, SignatureException {
		KeyFactory keyFactory = KeyFactory.getInstance("EC");
		PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(privateKeyEnc);
		PrivateKey priKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
		//构建签名 
		Signature signature = Signature.getInstance("SHA1withECDSA");
		signature.initSign(priKey);
		signature.update(src.getBytes());
		byte [] result = signature.sign();   // 签名后的数据信息
		return result;
	}
	
	/**
	 * 生成私钥
	 * @param keyPair
	 * @return
	 */
	public static ECPrivateKey getESAPrivateKey(KeyPair keyPair) {
		ECPrivateKey ecPrivateKey = (ECPrivateKey) keyPair.getPrivate();
		return ecPrivateKey;
	}
	
	/**
	 * 生成公钥
	 * @param keyPair
	 * @return
	 */
	public static ECPublicKey getRSPublicKey(KeyPair keyPair) {
		ECPublicKey ecPublicKey = (ECPublicKey) keyPair.getPublic();
		return ecPublicKey;
	}

	/**
	 * 生成秘钥对的材料 
	 * @return
	 * @throws NoSuchAlgorithmException
	 */
	private static KeyPair getKeyPair() throws NoSuchAlgorithmException {
		KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("EC");
		keyPairGenerator.initialize(256);
		KeyPair keyPair = keyPairGenerator.generateKeyPair();
		return keyPair;
	}
}

输出结果：

签名后的数据：MEUCIQCpSOMWjSQtuCaRNPus8ukUwQ55c7HEc5Tx28al2zYg7wIgbKTtGEFoOZCtlxtT0gh08vhMJ0CO6on2juX4uTD7Wg0=
签名验证的结果：true

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