-(NSString *)createMD5SingForPayWithAppID:(NSString *)appid_key partnerid:(NSString *)partnerid_key prepayid:(NSString *)prepayid_key package:(NSString *)package_key noncestr:(NSString *)noncestr_key timestamp:(UInt32)timestamp_key{
NSMutableDictionary *signParams = [NSMutableDictionary dictionary];
[signParams setObject:appid_key forKey:@"appid"];//微信appid 例如wxfb132134e5342
[signParams setObject:noncestr_key forKey:@"noncestr"];//随机字符串
[signParams setObject:package_key forKey:@"package"];//扩展字段 参数为 Sign=WXPay
[signParams setObject:partnerid_key forKey:@"partnerid"];//商户账号
[signParams setObject:prepayid_key forKey:@"prepayid"];//此处为统一下单接口返回的预支付订单号
[signParams setObject:[NSString stringWithFormat:@"%u",timestamp_key] forKey:@"timestamp"];//时间戳
NSMutableString *contentString =[NSMutableString string];
NSArray *keys = [signParams allKeys];
//按字母顺序排序
NSArray *sortedArray = [keys sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
return [obj1 compare:obj2 options:NSNumericSearch];
}];
//拼接字符串
for (NSString *categoryId in sortedArray) {
if ( ![[signParams objectForKey:categoryId] isEqualToString:@""]
&& ![[signParams objectForKey:categoryId] isEqualToString:@"sign"]
&& ![[signParams objectForKey:categoryId] isEqualToString:@"key"]
)
{
[contentString appendFormat:@"%@=%@&", categoryId, [signParams objectForKey:categoryId]];
}
}
//添加商户密钥key字段 API 密钥
[contentString appendFormat:@"key=%@", @"BlH3IzF2v3WmZsC1IIowcrjnud3V8wBt"];
NSString *result = [self MD5ForLower32Bate:contentString];//md5加密
return result;
}
