两个知识点,一个是桥接一个是扩展

新建一个. h 头文件 我取名为 Header.h

#ifndef Header_h
#define Header_h

#import <CommonCrypto/CommonHMAC.h>
#import <CommonCrypto/CommonDigest.h>//md5

#endif /* Header_h */

路径为 项目名/所在文件价/头文件

项目名/http_bdy/other/Header.h

image.png

对字符串扩展方便加密

import Foundation


enum CryptoAlgorithm {
    case MD5, SHA1, SHA224, SHA256, SHA384, SHA512
    
    var HMACAlgorithm: CCHmacAlgorithm {
        var result: Int = 0
        switch self {
        case .MD5:      result = kCCHmacAlgMD5
        case .SHA1:     result = kCCHmacAlgSHA1
        case .SHA224:   result = kCCHmacAlgSHA224
        case .SHA256:   result = kCCHmacAlgSHA256
        case .SHA384:   result = kCCHmacAlgSHA384
        case .SHA512:   result = kCCHmacAlgSHA512
        }
        return CCHmacAlgorithm(result)
    }
    
    var digestLength: Int {
        var result: Int32 = 0
        switch self {
        case .MD5:      result = CC_MD5_DIGEST_LENGTH
        case .SHA1:     result = CC_SHA1_DIGEST_LENGTH
        case .SHA224:   result = CC_SHA224_DIGEST_LENGTH
        case .SHA256:   result = CC_SHA256_DIGEST_LENGTH
        case .SHA384:   result = CC_SHA384_DIGEST_LENGTH
        case .SHA512:   result = CC_SHA512_DIGEST_LENGTH
        }
        return Int(result)
    }
}

extension String {
    func hmac(algorithm: CryptoAlgorithm) -> String {
        let key = "DaMai"
        let str = self.cString(using: String.Encoding.utf8)
        let strLen = Int(self.lengthOfBytes(using: String.Encoding.utf8))
        let digestLen = algorithm.digestLength
        let result = UnsafeMutablePointer<CUnsignedChar>.allocate(capacity: digestLen)
        let keyStr = key.cString(using: String.Encoding.utf8)
        let keyLen = Int(key.lengthOfBytes(using: String.Encoding.utf8))
        
        CCHmac(algorithm.HMACAlgorithm, keyStr!, keyLen, str!, strLen, result)
        
        let digest = stringFromResult(result: result, length: digestLen)
        
        result.deallocate(capacity: digestLen)
        
        return digest
    }
    
    private func stringFromResult(result: UnsafeMutablePointer<CUnsignedChar>,
                                  length: Int) -> String {
        let hash = NSMutableString()
        for i in 0..<length {
            hash.appendFormat("%02x", result[i])
        }
        return String(hash)
    }
}




class SignUtil{
    var waitSignStr = String()
    init(datas: inout [String:String]){
        let keys = datas.sorted(by: {$0.0 < $1.0})
//        let values = datas.sorted(by: {$0.1 < $1.1})//对value排序
        for(mkey , mvalue) in keys {
            if waitSignStr.isEmpty {
                if !mvalue.isEmpty {
                   waitSignStr = mkey + "=" + mvalue
                }else{
                    datas.removeValue(forKey: mkey)
                }
                
            } else {
                if !mvalue.isEmpty {
                   waitSignStr = waitSignStr + "&" + mkey + "=" + mvalue
                }else{
                   datas.removeValue(forKey: mkey)
                }
            }
        }
        waitSignStr = waitSignStr + "&key=uUwUCQTvZ70$a37Pf!CJhodg0u0$!Uw9"
        
        print("加密串:\(waitSignStr)")
    }
}

extension SignUtil {
    func signInfo() -> String{
        let hmacStr = waitSignStr.hmac(algorithm:.SHA1)
        return hmacStr
    }
}

使用,我这边是网络请求的时候加密参数用的,所以传的是字典,使用时根据实际情况而定

    let signStr = SignUtil.init(datas: &params).signInfo()