支付宝对接RSA加解签及ILLEGAL_SIGN踩坑

ILLEGAL_SIGN踩坑记：需对sign值进行URLEncoder编码

RSA加解签

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

import java.io.*;
import java.security.KeyFactory;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

public class RSA {

    private static final String SIGN_TYPE_RSA = "RSA";

    private static final String SIGN_TYPE_RSA2 = "RSA2";

    private static final String SIGN_ALGORITHMS = "SHA1WithRSA";

    private static final String SIGN_SHA256RSA_ALGORITHMS = "SHA256WithRSA";

    private static final int DEFAULT_BUFFER_SIZE = 8192;

    /**
     * RSA/RSA2 加签
     * @param signType
     * @param privateKey
     * @param content
     * @param charset
     * @return
     * @throws Exception
     */
    public static String rsaSign(String signType, String privateKey, String content, String charset) throws Exception {
        PrivateKey priKey = null;
        Signature signature = null;
        if (SIGN_TYPE_RSA.equals(signType)) {
            priKey = getPrivateKeyFromPKCS8(SIGN_TYPE_RSA, new ByteArrayInputStream(privateKey.getBytes()));
            signature = java.security.Signature.getInstance(SIGN_ALGORITHMS);
        } else if (SIGN_TYPE_RSA2.equals(signType)) {
            priKey = getPrivateKeyFromPKCS8(SIGN_TYPE_RSA, new ByteArrayInputStream(privateKey.getBytes()));
            signature = java.security.Signature.getInstance(SIGN_SHA256RSA_ALGORITHMS);
        } else {
            throw new Exception("不是支持的签名类型: signType=" + signType);
        }
        signature.initSign(priKey);

        if (StringUtils.isEmpty(charset)) {
            signature.update(content.getBytes());
        } else {
            signature.update(content.getBytes(charset));
        }

        byte[] signed = signature.sign();

        return new String(Base64.encodeBase64(signed));
    }

    /**
     * 验签方法
     *
     * @param content 参数的合成字符串格式: key1=value1&key2=value2&key3=value3
     * @param signType
     * @param sign
     * @param publicKey
     * @param content
     * @param charset
     * @return
     */
    public static boolean rsaVerify(String signType, String sign, String publicKey, String content, String charset) throws Exception {
        java.security.Signature signature = null;
        PublicKey pubKey = getPublicKeyFromX509("RSA", new ByteArrayInputStream(publicKey.getBytes()));
        if (SIGN_TYPE_RSA.equals(signType)) {
            signature = java.security.Signature.getInstance(SIGN_ALGORITHMS);
        } else if (SIGN_TYPE_RSA2.equals(signType)) {
            signature = java.security.Signature.getInstance(SIGN_SHA256RSA_ALGORITHMS);
        } else {
            throw new Exception("不是支持的签名类型: signType=" + signType);
        }
        signature.initVerify(pubKey);

        if (StringUtils.isEmpty(charset)) {
            signature.update(content.getBytes());
        } else {
            signature.update(content.getBytes(charset));
        }

        return signature.verify(Base64.decodeBase64(sign.getBytes()));
    }

    private static PrivateKey getPrivateKeyFromPKCS8(String algorithm, InputStream ins) throws Exception {
        if (ins == null || StringUtils.isEmpty(algorithm)) {
            return null;
        }

        KeyFactory keyFactory = KeyFactory.getInstance(algorithm);

        byte[] encodedKey = readText(ins).getBytes();

        encodedKey = Base64.decodeBase64(encodedKey);

        return keyFactory.generatePrivate(new PKCS8EncodedKeySpec(encodedKey));
    }

    private static PublicKey getPublicKeyFromX509(String algorithm, InputStream ins) throws Exception {
        KeyFactory keyFactory = KeyFactory.getInstance(algorithm);

        StringWriter writer = new StringWriter();
        io(new InputStreamReader(ins), writer, -1);

        byte[] encodedKey = writer.toString().getBytes();

        encodedKey = Base64.decodeBase64(encodedKey);

        return keyFactory.generatePublic(new X509EncodedKeySpec(encodedKey));
    }

    private static String readText(InputStream ins) throws IOException {
        Reader reader = new InputStreamReader(ins);
        StringWriter writer = new StringWriter();

        io(reader, writer, -1);
        return writer.toString();
    }

    private static void io(Reader in, Writer out, int bufferSize) throws IOException {
        if (bufferSize == -1) {
            bufferSize = DEFAULT_BUFFER_SIZE >> 1;
        }

        char[] buffer = new char[bufferSize];
        int amount;

        while ((amount = in.read(buffer)) >= 0) {
            out.write(buffer, 0, amount);
        }
    }

}

ILLEGAL_SIGN解决

private String getSign(String signType, String signKey, String content, String inputCharset) {
    String sign = "";
    if ("MD5".equalsIgnoreCase(signType)) {
        sign = MD5.sign(content, signKey, inputCharset);
    } else if ("RSA".equalsIgnoreCase(signType) || "RSA2".equalsIgnoreCase(signType)) {
        try {
            sign = RSA.rsaSign(signType, privateKey, content, inputCharset);
            sign = URLEncoder.encode(sign, inputCharset);  //解决ILLEGAL_SIGN
        } catch (Exception e) {
        }
    }
    return sign;
}

MD5加解签

import org.apache.commons.codec.digest.DigestUtils;

import java.io.UnsupportedEncodingException;
import java.security.SignatureException;

public class MD5 {

    /**
     * 签名字符串
     *
     * @param text    需要签名的字符串
     * @param key     密钥
     * @param charset 编码格式
     * @return 签名结果
     */
    public static String sign(String text, String key, String charset) {
        text = text + key;
        return DigestUtils.md5Hex(getContentBytes(text, charset));
    }

    /**
     * 签名字符串
     *
     * @param text    需要签名的字符串
     * @param sign    签名结果
     * @param key     密钥
     * @param charset 编码格式
     * @return 签名结果
     */
    public static boolean verify(String text, String sign, String key, String charset) {
        text = text + key;
        String mySign = DigestUtils.md5Hex(getContentBytes(text, charset));
        if (mySign.equals(sign)) {
            return true;
        } else {
            return false;
        }
    }

    /**
     * @param content
     * @param charset
     * @return
     * @throws SignatureException
     * @throws UnsupportedEncodingException
     */
    private static byte[] getContentBytes(String content, String charset) {
        if (charset == null || "".equals(charset)) {
            return content.getBytes();
        }
        try {
            return content.getBytes(charset);
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException("MD5签名过程中出现错误,指定的编码集不对,您目前指定的编码集是:" + charset);
        }
    }

}