最近在接入一些腾讯云的API，腾讯是不是歧视我 iOS 没有 OC 示例，也没有 Swift 示例，可能是面向服务器的吧，但是边上安卓的童鞋直接复制JAVA代码就跑起来~~~我难受。
最看不起别人拿来主义，最希望自己可以 Command + C
更难受的是我用的是 Swift, 系统没有现成的加密库，但是真的不想又引入一个第三方库,这里指的是这个库 CryptoSwift，当然不Care的童鞋直接pod install就好,这个无非是个人喜好，100来行代码可以解决的问题自己试试不香吗~
准备
在桥接文件里导入 #import <CommonCrypto/CommonHMAC.h>
桥接文件在你的Swift工程里面创建一个OC文件，Xcode就会帮你创建好啦。
代码
代码不多，我直接贴这里了，要的直接拷贝就好，也欢迎直接去GitHub中ZYCrypto给予一个小小的Star：
import Foundationextension String {
func hmac(by algorithm: Algorithm, key: [UInt8]) -> [UInt8] {
var result = [UInt8](repeating: 0, count: algorithm.digestLength())
CCHmac(algorithm.algorithm(), key, key.count, self.bytes, self.bytes.count, &result)
return result
}func hashHex(by algorithm: Algorithm) -> String { return algorithm.hash(string: self).hexString } func hash(by algorithm: Algorithm) -> [UInt8] { return algorithm.hash(string: self) }}
enum Algorithm {
case MD5, SHA1, SHA224, SHA256, SHA384, SHA512func algorithm() -> 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) } func digestLength() -> Int { var result: CInt = 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) } func hash(string: String) -> [UInt8] { var hash = [UInt8](repeating: 0, count: self.digestLength()) switch self { case .MD5: CC_MD5( string.bytes, CC_LONG(string.bytes.count), &hash) case .SHA1: CC_SHA1( string.bytes, CC_LONG(string.bytes.count), &hash) case .SHA224: CC_SHA224(string.bytes, CC_LONG(string.bytes.count), &hash) case .SHA256: CC_SHA256(string.bytes, CC_LONG(string.bytes.count), &hash) case .SHA384: CC_SHA384(string.bytes, CC_LONG(string.bytes.count), &hash) case .SHA512: CC_SHA512(string.bytes, CC_LONG(string.bytes.count), &hash) } return hash }}
extension Array where Element == UInt8 {
var hexString: String {
return self.reduce(""){$0 + String(format: "%02x", $1)}
}var base64String: String { return self.data.base64EncodedString(options: Data.Base64EncodingOptions.lineLength76Characters) } var data: Data { return Data(self) }}
extension String {
var bytes: [UInt8] {
return UInt8
}
}
extension Data {
var bytes: [UInt8] {
return UInt8
}
}
从 swift 加密 抄了一点, 直接使用无法实现需求，同时好像代码太OC了，所以改了改，但是还是要在此表示感谢。
使用的话非常简单
HMAC
let tData = "test string".hmac(by: .SHA256, key: "key string".bytes)
let oDada = "other test string".hamc(by: .SHA256, key: tData)
let signature = oData.hexSting.lowercased()HASH
let sha256Hash = "test string".hashHex(by: .SHA256)
let md5Hash = "test string".hash(by: .MD5).base64String腾讯云 TC3-HMAC-SHA256 签名
这是 https://cloud.tencent.com/document/product/1131/42337 腾讯云文档的一个接口鉴权文档，前面说了，很遗憾，没有Swift 示例，也可能是因为iOS没有现成的加密工具有关。
主要还是加密功能的实现，实现了对应的加密方法，一切都按照流程来就好。
腾讯云 TC3-HMAC-SHA256 签名示例：
let secretId = "AKIDz8krbsJ5yKBZQpn74WFkmLPx3EXAMPLE"
let secretKey = "Gu5t9xGARNpq86cd98joQYCN3EXAMPLE"
let action = "DescribeInstances"
let service = "cvm"
let host = "cvm.tencentcloudapi.com"
let region = "ap-guangzhou"
let version = "2017-03-12"
let algorithm = "TC3-HMAC-SHA256"
let timestampInterval: TimeInterval = 1551113065
let timestamp = "\(Int(timestampInterval))"
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
//注意时区，否则容易出错
dateFormatter.timeZone = TimeZone(identifier: "UTC")
let date = dateFormatter.string(from: Date(timeIntervalSince1970: timestampInterval))
// ************* 步骤 1：拼接规范请求串 *************
let httpRequestMethod = "POST"
let canonicalUri = "/"
let canonicalQueryString = ""
let canonicalHeaders = "content-type:application/json; charset=utf-8\n" + "host:" + host + "\n"
let signedHeaders = "content-type;host"
let payload = "{"Limit": 1, "Filters": [{"Values": ["\u672a\u547d\u540d"], "Name":"instance-name"}]}"
let hashedRequestPayload = payload.hashHex(by: .SHA256)
let canonicalRequest = httpRequestMethod + "\n" + canonicalUri + "\n" + canonicalQueryString + "\n"
+ canonicalHeaders + "\n" + signedHeaders + "\n" + hashedRequestPayload;
print("第一步结果：", canonicalRequest)
// ************* 步骤 2：拼接待签名字符串 *************
let credentialScope = date + "/" + service + "/" + "tc3_request"
let hashedCanonicalRequest = canonicalRequest.hashHex(by: .SHA256)
let stringToSign = algorithm + "\n" + timestamp + "\n" + credentialScope + "\n" +
hashedCanonicalRequest
print("第二步结果：", stringToSign)
// ************* 步骤 3：计算签名 *************
let secretDate = date.hmac(by: .SHA256, key: ("TC3" + secretKey).bytes)
let secretService = service.hmac(by: .SHA256, key: secretDate)
let secretSigning = "tc3_request".hmac(by: .SHA256, key: secretService)
let signature = stringToSign.hmac(by: .SHA256, key: secretSigning).hexString.lowercased()
print("第三步结果：", signature)
// ************* 步骤 4：拼接 Authorization *************
let authorization = "TC3-HMAC-SHA256 " + "Credential=" + secretId + "/" + credentialScope + ", "
"SignedHeaders=" + signedHeaders + ", " + "Signature=" + signature
print("第四步结果：", authorization)
textView.text += "第四步结果：" + authorization + "\n"
var headerParams = String: Any
headerParams["Host"] = host
headerParams["Authorization"] = authorization
headerParams["Content-Type"] = "application/json; charset=utf-8"
headerParams["X-TC-Action"] = action
headerParams["X-TC-Timestamp"] = timestamp
headerParams["X-TC-Version"] = version
//然后例如AFN,可以使用AFHTTPRequestSerializer 的 requestSerializer 写入到请求头
// for headerParam in headerParams {
// requestSerializer.setValue(headerParam.value, forHTTPHeaderField: headerParam.key)
// }
这是加密结果，和文档中结果一致：
