开发环境Visual Studio 2015,Xamarin 3.11.1537,Xamarin Android5.1.7.12

下载支付宝移动支付的SDKhttp://doc.open.alipay.com/doc2/detail?treeId=54&articleId=103419&docType=1),找到AndriudSDK,其中有一个alipaySDK-20151014.jar(这个版本,以后肯定会变化),这是我们使用的重点。

  • 在Visual Studio中创建一个绑定库文件

    Xamarin只言片语3——Xamarin.Android下支付宝(Alipay SDK)使用_第1张图片

    把支付宝的alipaySDK-20151014.jar添加到Jars文件夹下,先中alipaySDK-20151014.jar,打开属性窗口,设置生成操作为EmbeddedJar,库文件搞定。

  • Android中使用绑定库文件

    在Visual Studio中创建一个BlankApp应用,然后在打开项目属性,Android Manifest选项卡,在Required permissions中选择ACCESS_WIFI_STATE和INTERNET权限,添加绑定库生成的dll到当前项目的引用中。

    添加签名生成类

using System;
using System.Text;
using System.IO;
using System.Security.Cryptography;
 
namespace App1
{
    class SignatureUtils
    {
        /// 
        /// 签名
        /// 
        /// 需要签名的内容
        /// 私钥
        /// 
        public static string Sign(string content, string privateKey)
        {      
            byte[] Data = Encoding.GetEncoding("utf-8").GetBytes(content);
            RSACryptoServiceProvider rsa = DecodePemPrivateKey(privateKey);
            SHA1 sh = new SHA1CryptoServiceProvider();
           
            byte[] signData = rsa.SignData(Data, sh);
            sh.Clear();
            return Convert.ToBase64String(signData);
        }
 
        /// 
        /// 对prikey进行处理,C#API默认的prikey是xml格式的,所以需要进行处理
        /// 
        /// 
        /// 
        private static RSACryptoServiceProvider DecodePemPrivateKey(String pemstr)
        {
            byte[] pkcs8privatekey;
            pkcs8privatekey = Convert.FromBase64String(pemstr);
            if (pkcs8privatekey != null)
            {
 
                RSACryptoServiceProvider rsa = DecodePrivateKeyInfo(pkcs8privatekey);
                return rsa;
            }
            else
                return null;
        }
 
        /// 
        /// 转换prikey
        /// 
        /// 
        /// 
        private static RSACryptoServiceProvider DecodePrivateKeyInfo(byte[] pkcs8)
        {
 
            byte[] SeqOID = { 0x30, 0x0D, 0x06, 0x09, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x01, 0x01, 0x05, 0x00 };
            byte[] seq = new byte[15];
 
            MemoryStream mem = new MemoryStream(pkcs8);
            int lenstream = (int)mem.Length;
            BinaryReader binr = new BinaryReader(mem);  
            byte bt = 0;
            ushort twobytes = 0;
 
            try
            {
 
                twobytes = binr.ReadUInt16();
                if (twobytes == 0x8130) 
                    binr.ReadByte();   
                else if (twobytes == 0x8230)
                    binr.ReadInt16();  
                else
                    return null;
 
 
                bt = binr.ReadByte();
                if (bt != 0x02)
                    return null;
 
                twobytes = binr.ReadUInt16();
 
                if (twobytes != 0x0001)
                    return null;
 
                seq = binr.ReadBytes(15);      
                if (!CompareBytearrays(seq, SeqOID))   
                    return null;
 
                bt = binr.ReadByte();
                if (bt != 0x04) 
                    return null;
 
                bt = binr.ReadByte();      
                if (bt == 0x81)
                    binr.ReadByte();
                else
                    if (bt == 0x82)
                        binr.ReadUInt16();
                
                byte[] rsaprivkey = binr.ReadBytes((int)(lenstream - mem.Position));
                RSACryptoServiceProvider rsacsp = DecodeRSAPrivateKey(rsaprivkey);
                return rsacsp;
            }
 
            catch (Exception)
            {
                return null;
            }
 
            finally { binr.Close(); }
 
        }
 
 
        private static bool CompareBytearrays(byte[] a, byte[] b)
        {
            if (a.Length != b.Length)
                return false;
            int i = 0;
            foreach (byte c in a)
            {
                if (c != b[i])
                    return false;
                i++;
            }
            return true;
        }
 
        /// 
        /// 处理私钥
        /// 
        /// 
        /// 
        private static RSACryptoServiceProvider DecodeRSAPrivateKey(byte[] privkey)
        {
            byte[] MODULUS, E, D, P, Q, DP, DQ, IQ;
 
           
            MemoryStream mem = new MemoryStream(privkey);
            BinaryReader binr = new BinaryReader(mem);   
            byte bt = 0;
            ushort twobytes = 0;
            int elems = 0;
            try
            {
                twobytes = binr.ReadUInt16();
                if (twobytes == 0x8130) 
                    binr.ReadByte();    
                else if (twobytes == 0x8230)
                    binr.ReadInt16();   
                else
                    return null;
 
                twobytes = binr.ReadUInt16();
                if (twobytes != 0x0102) 
                    return null;
                bt = binr.ReadByte();
                if (bt != 0x00)
                    return null;
 
 
                elems = GetIntegerSize(binr);
                MODULUS = binr.ReadBytes(elems);
 
                elems = GetIntegerSize(binr);
                E = binr.ReadBytes(elems);
 
                elems = GetIntegerSize(binr);
                D = binr.ReadBytes(elems);
 
                elems = GetIntegerSize(binr);
                P = binr.ReadBytes(elems);
 
                elems = GetIntegerSize(binr);
                Q = binr.ReadBytes(elems);
 
                elems = GetIntegerSize(binr);
                DP = binr.ReadBytes(elems);
 
                elems = GetIntegerSize(binr);
                DQ = binr.ReadBytes(elems);
 
                elems = GetIntegerSize(binr);
                IQ = binr.ReadBytes(elems);
 
                CspParameters cspParams = new CspParameters();
                cspParams.Flags = CspProviderFlags.UseMachineKeyStore;
                         //System.Security.Cryptography.RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(1024, cspParams); 
                                 RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(1024);
                RSAParameters RSAparams = new RSAParameters();
                RSAparams.Modulus = MODULUS;
                RSAparams.Exponent = E;
                RSAparams.D = D;
                RSAparams.P = P;
                RSAparams.Q = Q;
                RSAparams.DP = DP;
                RSAparams.DQ = DQ;
                RSAparams.InverseQ = IQ;
                RSA.ImportParameters(RSAparams);
                return RSA;
            }
            catch (Exception)
            {
                return null;
            }
            finally { binr.Close(); }
        }
 
        /// 
        /// 获取binr的长度
        /// 
        /// 
        /// 
        private static int GetIntegerSize(BinaryReader binr)
        {
            byte bt = 0;
            byte lowbyte = 0x00;
            byte highbyte = 0x00;
            int count = 0;
            bt = binr.ReadByte();
            if (bt != 0x02)     
                return 0;
            bt = binr.ReadByte();
 
            if (bt == 0x81)
                count = binr.ReadByte();    
            else
                if (bt == 0x82)
                {
                    highbyte = binr.ReadByte(); 
                    lowbyte = binr.ReadByte();
                    byte[] modint = { lowbyte, highbyte, 0x00, 0x00 };
                    count = BitConverter.ToInt32(modint, 0);
                }
                else
                {
                    count = bt;     
                }
 
            while (binr.ReadByte() == 0x00)
            {   
                count -= 1;
            }
            binr.BaseStream.Seek(-1, SeekOrigin.Current);       
            return count;
        }
    }
}


在主程序中添加如下代码:

using System;
using Android.App;
using Android.Widget;
using Android.OS;
using Java.Net;
 
namespace App1
{
    [Activity(Label = "App1", MainLauncher = true)]
    public class MainActivity : Activity
    { 
        // 合作商户ID。用签约支付宝账号登录ms.alipay.com后,在账户信息页面获取。
        public static string PARTNER = "替换你支付宝申请的partner";
        // 商户收款的支付宝账号
        public static string SELLER = "替换你支付宝申请的seller";
        //商户私密
        string RSA_PRIVATE = "替换你支付宝申请的private_key";
;
 
        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);
 
            SetContentView(Resource.Layout.Main);
            Button button = FindViewById

            orderInfo += "&service=\"mobile.securitypay.pay\"";

            // 支付类型, 固定值

            orderInfo += "&payment_type=\"1\"";

            // 参数编码, 固定值

            orderInfo += "&_input_charset=\"utf-8\"";

            // 设置未付款交易的超时时间

            // 默认30分钟,一旦超时,该笔交易就会自动被关闭。

            // 取值范围:1m15d

            // m-分钟,h-小时,d-天,1c-当天(无论交易何时创建,都在0点关闭)。

            // 该参数数值不接受小数点,如1.5h,可转换为90m

            orderInfo += "&it_b_pay=\"30m\"";

            // extern_token为经过快登授权获取到的alipay_open_id,带上此参数用户将使用授权的账户进行支付

            // orderInfo += "&extern_token=" + "\"" + extern_token + "\"";

            // 支付宝处理完请求后,当前页面跳转到商户指定页面的路径,可空

            orderInfo += "&return_url=\"m.alipay.com\"";

            // 调用银行卡支付,需配置此参数,参与签名, 固定值 (需要签约《无线银行卡快捷支付》才能使用)

            // orderInfo += "&paymethod=\"expressGateway\"";

            return orderInfo;

        }  

        public String MySignType

        {

            get

            {

                return "sign_type=\"RSA\"";

            }

        }

        #endregion

    }

}


源代码见附件