Swift 4中的HMAC SHA256 [英] HMAC SHA256 in Swift 4
本文介绍了Swift 4中的HMAC SHA256的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有一个字符串和一个密钥，我想从中生成一个HMAC SHA256.虽然我正在使用2个库
没有什么真正适合我的.我的真实来源是那两个网站
和
https://www.freeformatter.com/hmac-generator.html #ad-output
他们总是为我的情况生成正确的哈希键. 有什么想法可以在这里工作吗?一些代码示例
对于IDZSwiftCommonCrypto
func getHMacSHA256(forMessage message: String, key: String) -> String? {
let hMacVal = HMAC(algorithm: HMAC.Algorithm.sha256, key: key).update(string: message)?.final()
if let encryptedData = hMacVal {
let decData = NSData(bytes: encryptedData, length: Int(encryptedData.count))
let base64String = decData.base64EncodedString(options: .lineLength64Characters)
print("base64String: \(base64String)")
return base64String
} else {
return nil
}
}
对于CryptoSwift
let password: Array<UInt8> = Array(payload.utf8)
let salt: Array<UInt8> = Array("somekey".utf8)
let signedBody = try? HKDF(password: password, salt: salt, variant: .sha256).calculate()
但是没有什么能像真理的源头一样工作.有想法吗?
解决方案
我一直在使用它:
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, key: String) -> String {
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).lowercased()
}
}
您需要将#import <CommonCrypto/CommonHMAC.h>添加到Objective-C桥接标头中.
来源: @thevalyreangroup在此github线程上
I have a string and a key, which i want to generate an HMAC SHA256 from it. Although i'm using 2 libs
IDZSwiftCommonCrypto and CryptoSwift
and this answer
Nothing really worked for me. My source of truth are those 2 websites
and
https://www.freeformatter.com/hmac-generator.html#ad-output
Which they always generate the correct hash key for my case. Any idea in what can work here? Some code samples
For IDZSwiftCommonCrypto
func getHMacSHA256(forMessage message: String, key: String) -> String? {
let hMacVal = HMAC(algorithm: HMAC.Algorithm.sha256, key: key).update(string: message)?.final()
if let encryptedData = hMacVal {
let decData = NSData(bytes: encryptedData, length: Int(encryptedData.count))
let base64String = decData.base64EncodedString(options: .lineLength64Characters)
print("base64String: \(base64String)")
return base64String
} else {
return nil
}
}
And for CryptoSwift
let password: Array<UInt8> = Array(payload.utf8)
let salt: Array<UInt8> = Array("somekey".utf8)
let signedBody = try? HKDF(password: password, salt: salt, variant: .sha256).calculate()
But nothing really works like the sources of truth.Any idea?
解决方案
I've been using this:
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, key: String) -> String {
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).lowercased()
}
}
You'll need to add #import <CommonCrypto/CommonHMAC.h> to your Objective-C bridging header.
Source: @thevalyreangroup on this github thread
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