java SHA1WithRSA 算法

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.security.KeyFactory;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

import javax.crypto.Cipher;

public class RSA{

	public static final String  SIGN_ALGORITHMS = "SHA1WithRSA";

	/**
	* RSA签名
	* @param content 待签名数据
	* @param privateKey 商户私钥
	* @param input_charset 编码格式
	* @return 签名值
	*/
	public static String sign(String content, String privateKey, String input_charset)
	{
        try
        {
        	PKCS8EncodedKeySpec priPKCS8 	= new PKCS8EncodedKeySpec( Base64.decode(privateKey) );
        	KeyFactory keyf 				= KeyFactory.getInstance("RSA");
        	PrivateKey priKey 				= keyf.generatePrivate(priPKCS8);

            java.security.Signature signature = java.security.Signature
                .getInstance(SIGN_ALGORITHMS);

            signature.initSign(priKey);
            signature.update( content.getBytes(input_charset) );

            byte[] signed = signature.sign();

            return Base64.encode(signed);
        }
        catch (Exception e)
        {
        	e.printStackTrace();
        }

        return null;
    }

	/**
	* RSA验签名检查
	* @param content 待签名数据
	* @param sign 签名值
	* @param ali_public_key 支付宝公钥
	* @param input_charset 编码格式
	* @return 布尔值
	*/
	public static boolean verify(String content, String sign, String ali_public_key, String input_charset)
	{
		try
		{
			KeyFactory keyFactory = KeyFactory.getInstance("RSA");
	        byte[] encodedKey = Base64.decode(ali_public_key);
	        PublicKey pubKey = keyFactory.generatePublic(new X509EncodedKeySpec(encodedKey));

			java.security.Signature signature = java.security.Signature
			.getInstance(SIGN_ALGORITHMS);

			signature.initVerify(pubKey);
			signature.update( content.getBytes(input_charset) );

			boolean bverify = signature.verify( Base64.decode(sign) );
			return bverify;

		}
		catch (Exception e)
		{
			e.printStackTrace();
		}

		return false;
	}

	/**
	* 解密
	* @param content 密文
	* @param private_key 商户私钥
	* @param input_charset 编码格式
	* @return 解密后的字符串
	*/
	public static String decrypt(String content, String private_key, String input_charset) throws Exception {
        PrivateKey prikey = getPrivateKey(private_key);

        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, prikey);

        InputStream ins = new ByteArrayInputStream(Base64.decode(content));
        ByteArrayOutputStream writer = new ByteArrayOutputStream();
        //rsa解密的字节大小最多是128，将需要解密的内容，按128位拆开解密
        byte[] buf = new byte[128];
        int bufl;

        while ((bufl = ins.read(buf)) != -1) {
            byte[] block = null;

            if (buf.length == bufl) {
                block = buf;
            } else {
                block = new byte[bufl];
                for (int i = 0; i < bufl; i++) {
                    block[i] = buf[i];
                }
            }

            writer.write(cipher.doFinal(block));
        }

        return new String(writer.toByteArray(), input_charset);
    }

	/**
	* 得到私钥
	* @param key 密钥字符串（经过base64编码）
	* @throws Exception
	*/
	public static PrivateKey getPrivateKey(String key) throws Exception {

		byte[] keyBytes;

		keyBytes = Base64.decode(key);

		PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);

		KeyFactory keyFactory = KeyFactory.getInstance("RSA");

		PrivateKey privateKey = keyFactory.generatePrivate(keySpec);

		return privateKey;
	}
}