Created
September 3, 2019 16:08
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JWT Swift5 + Common Crypto
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import Foundation | |
import CommonCrypto | |
public func jwt(payload: [String: Any], secret: String) -> String? { | |
guard let data = try? JSONSerialization.data(withJSONObject: payload, options: []) else { | |
return nil | |
} | |
return jwt(payload: data, secret: secret) | |
} | |
public func jwt(payload: Data, secret: String) -> String? { | |
guard let str = String(data: payload, encoding: .utf8) else { | |
return nil | |
} | |
return jwt(payload: str, secret: secret) | |
} | |
public func jwt<T: Encodable>(payload: T, secret: String) -> String? { | |
guard let data = try? JSONEncoder().encode(payload) else { | |
return nil | |
} | |
return jwt(payload: data, secret: secret) | |
} | |
public func jwt(payload: String, secret: String) -> String? { | |
guard let payload64String = payload.data(using: .utf8)?.base64EncodedString() else { | |
return nil | |
} | |
let headers = """ | |
{"alg":"HS256","typ":"JWT"} | |
""" | |
guard let headers64String = headers.data(using: .utf8)?.base64EncodedString() else { | |
return nil | |
} | |
var jwt = "\(headers64String).\(payload64String)" | |
guard let signature = jwt.hmac256(secret: secret) else { | |
return nil | |
} | |
jwt += ".\(signature)" | |
return jwt | |
} | |
private extension String { | |
func hmac256(secret: String) -> String? { | |
guard let dataCharPtr = self.base64URL.cString(using: .utf8) else { return nil } | |
guard let keyCharPtr = secret.cString(using: .utf8) else { return nil } | |
var digest = [UInt8](repeating: 0, count: Int(CC_SHA256_DIGEST_LENGTH)) | |
CCHmac( | |
CCHmacAlgorithm(kCCHmacAlgSHA256), | |
keyCharPtr, | |
strlen(keyCharPtr), | |
dataCharPtr, | |
strlen(dataCharPtr), | |
&digest | |
) | |
return Data(digest).base64EncodedString().base64URL | |
} | |
/// https://en.wikipedia.org/wiki/Base64#Variants_summary_table | |
var base64URL: String { | |
return self | |
.replacingOccurrences(of: "=", with: "") | |
.replacingOccurrences(of: "+", with: "-") | |
.replacingOccurrences(of: "/", with: "_") | |
} | |
} |
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