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Added support for RSA based JWT tokens #72

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dfb5baa
Added support for RSA based JWT tokens
May 18, 2017
f8251b3
Convert PEM keys to DER
May 18, 2017
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10 changes: 10 additions & 0 deletions JWT.xcodeproj/project.pbxproj
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,10 @@
520A71181C469F010005C709 /* Claims.swift in Sources */ = {isa = PBXBuildFile; fileRef = 520A71141C469F010005C709 /* Claims.swift */; };
520A71191C469F010005C709 /* Decode.swift in Sources */ = {isa = PBXBuildFile; fileRef = 520A71151C469F010005C709 /* Decode.swift */; };
520A711A1C469F010005C709 /* JWT.swift in Sources */ = {isa = PBXBuildFile; fileRef = 520A71161C469F010005C709 /* JWT.swift */; };
893A292B1ECDE8A700C10A48 /* SwCrypt.swift in Sources */ = {isa = PBXBuildFile; fileRef = 893A292A1ECDE8A700C10A48 /* SwCrypt.swift */; };
893A292C1ECDE8A700C10A48 /* SwCrypt.swift in Sources */ = {isa = PBXBuildFile; fileRef = 893A292A1ECDE8A700C10A48 /* SwCrypt.swift */; };
893A292D1ECDE8A700C10A48 /* SwCrypt.swift in Sources */ = {isa = PBXBuildFile; fileRef = 893A292A1ECDE8A700C10A48 /* SwCrypt.swift */; };
893A292E1ECDE8A700C10A48 /* SwCrypt.swift in Sources */ = {isa = PBXBuildFile; fileRef = 893A292A1ECDE8A700C10A48 /* SwCrypt.swift */; };
CD9B62171C7753D8005D4844 /* Claims.swift in Sources */ = {isa = PBXBuildFile; fileRef = 520A71141C469F010005C709 /* Claims.swift */; };
CD9B62181C7753D8005D4844 /* JWT.swift in Sources */ = {isa = PBXBuildFile; fileRef = 520A71161C469F010005C709 /* JWT.swift */; };
CD9B62191C7753D8005D4844 /* Decode.swift in Sources */ = {isa = PBXBuildFile; fileRef = 520A71151C469F010005C709 /* Decode.swift */; };
Expand Down Expand Up @@ -95,6 +99,7 @@
520A711B1C469F440005C709 /* Package.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Package.swift; sourceTree = "<group>"; };
540942F3614C41E3827F2013 /* Pods_JWT.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = Pods_JWT.framework; sourceTree = BUILT_PRODUCTS_DIR; };
66725DA21C59202E00FC32F4 /* CryptoSwift.xcodeproj */ = {isa = PBXFileReference; lastKnownFileType = "wrapper.pb-project"; name = CryptoSwift.xcodeproj; path = Carthage/Checkouts/CryptoSwift/CryptoSwift.xcodeproj; sourceTree = "<group>"; };
893A292A1ECDE8A700C10A48 /* SwCrypt.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = SwCrypt.swift; sourceTree = "<group>"; };
CD9B62231C7753D8005D4844 /* JWT.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = JWT.framework; sourceTree = BUILT_PRODUCTS_DIR; };
CD9B62351C7753EC005D4844 /* JWT.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = JWT.framework; sourceTree = BUILT_PRODUCTS_DIR; };
CD9B62471C7753FB005D4844 /* JWT.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = JWT.framework; sourceTree = BUILT_PRODUCTS_DIR; };
Expand Down Expand Up @@ -218,6 +223,7 @@
520A71151C469F010005C709 /* Decode.swift */,
2777940F1DF22D0D00573F3E /* Encode.swift */,
520A71161C469F010005C709 /* JWT.swift */,
893A292A1ECDE8A700C10A48 /* SwCrypt.swift */,
);
path = Sources;
sourceTree = "<group>";
Expand Down Expand Up @@ -479,6 +485,7 @@
520A711A1C469F010005C709 /* JWT.swift in Sources */,
520A71191C469F010005C709 /* Decode.swift in Sources */,
277794101DF22D0D00573F3E /* Encode.swift in Sources */,
893A292B1ECDE8A700C10A48 /* SwCrypt.swift in Sources */,
2777940B1DF22BE400573F3E /* JOSEHeader.swift in Sources */,
277794051DF221F800573F3E /* ClaimSet.swift in Sources */,
520A71171C469F010005C709 /* Base64.swift in Sources */,
Expand All @@ -501,6 +508,7 @@
CD9B62181C7753D8005D4844 /* JWT.swift in Sources */,
CD9B62191C7753D8005D4844 /* Decode.swift in Sources */,
277794111DF22D0D00573F3E /* Encode.swift in Sources */,
893A292C1ECDE8A700C10A48 /* SwCrypt.swift in Sources */,
2777940C1DF22BE400573F3E /* JOSEHeader.swift in Sources */,
277794061DF221F800573F3E /* ClaimSet.swift in Sources */,
CD9B621A1C7753D8005D4844 /* Base64.swift in Sources */,
Expand All @@ -515,6 +523,7 @@
CD9B622A1C7753EC005D4844 /* JWT.swift in Sources */,
CD9B622B1C7753EC005D4844 /* Decode.swift in Sources */,
277794121DF22D0D00573F3E /* Encode.swift in Sources */,
893A292D1ECDE8A700C10A48 /* SwCrypt.swift in Sources */,
2777940D1DF22BE400573F3E /* JOSEHeader.swift in Sources */,
277794071DF221F800573F3E /* ClaimSet.swift in Sources */,
CD9B622C1C7753EC005D4844 /* Base64.swift in Sources */,
Expand All @@ -529,6 +538,7 @@
CD9B623C1C7753FB005D4844 /* JWT.swift in Sources */,
CD9B623D1C7753FB005D4844 /* Decode.swift in Sources */,
277794131DF22D0D00573F3E /* Encode.swift in Sources */,
893A292E1ECDE8A700C10A48 /* SwCrypt.swift in Sources */,
2777940E1DF22BE400573F3E /* JOSEHeader.swift in Sources */,
277794081DF221F800573F3E /* ClaimSet.swift in Sources */,
CD9B623E1C7753FB005D4844 /* Base64.swift in Sources */,
Expand Down
83 changes: 74 additions & 9 deletions Sources/JWT.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -3,20 +3,40 @@ import CryptoSwift

public typealias Payload = [String: Any]


/// The supported Algorithms
public enum Algorithm: CustomStringConvertible {
/// No Algorithm, i-e, insecure
case none

/// HMAC using SHA-256 hash algorithm
case hs256(Data)

/// HMAC using SHA-384 hash algorithm
case hs384(Data)

/// HMAC using SHA-512 hash algorithm
case hs512(Data)


/// RSA PKCS#1 using SHA-256 hash algorithm
case rs256(String)

/// RSA PKCS#1 using SHA-384 hash algorithm
case rs384(String)

/// RSA PKCS#1 using SHA-512 hash algorithm
case rs512(String)

/// RSA PSS using SHA-256 hash algorithm
case ps256(String)

/// RSA PSS using SHA-384 hash algorithm
case ps384(String)

/// RSA PSS using SHA-512 hash algorithm
case ps512(String)


public var description: String {
switch self {
case .none:
Expand All @@ -27,9 +47,21 @@ public enum Algorithm: CustomStringConvertible {
return "HS384"
case .hs512:
return "HS512"
case .rs256:
return "RS256"
case .rs384:
return "RS384"
case .rs512:
return "RS512"
case .ps256:
return "PS256"
case .ps384:
return "PS384"
case .ps512:
return "PS512"
}
}

/// Sign a message using the algorithm
func sign(_ message: String) -> String {
func signHS(_ key: Data, variant: CryptoSwift.HMAC.Variant) -> String {
Expand All @@ -43,22 +75,55 @@ public enum Algorithm: CustomStringConvertible {
}
return base64encode(Data(bytes: result))
}

func signRS(_ key: String, variant: CC.DigestAlgorithm, padding: CC.RSA.AsymmetricSAPadding) -> String {
let messageData = message.data(using: String.Encoding.utf8, allowLossyConversion: false)!
let result: Data
do {
let derKey = try SwKeyConvert.PublicKey.pemToPKCS1DER(key)

result = try CC.RSA.sign(messageData, derKey: derKey, padding: padding, digest: variant, saltLen:16)
} catch {
result = Data()
}
return base64encode(result)
}


switch self {
case .none:
return ""

case .hs256(let key):
return signHS(key, variant: .sha256)

case .hs384(let key):
return signHS(key, variant: .sha384)

case .hs512(let key):
return signHS(key, variant: .sha512)

case .rs256(let key):
return signRS(key, variant: .sha256, padding: .pkcs15)

case .rs384(let key):
return signRS(key, variant: .sha384, padding: .pkcs15)

case .rs512(let key):
return signRS(key, variant: .sha256, padding: .pkcs15)

case .ps256(let key):
return signRS(key, variant: .sha256, padding: .pss)

case .ps384(let key):
return signRS(key, variant: .sha384, padding: .pss)

case .ps512(let key):
return signRS(key, variant: .sha512, padding: .pss)

}
}

/// Verify a signature for a message using the algorithm
func verify(_ message: String, signature: Data) -> Bool {
return sign(message) == base64encode(signature)
Expand Down
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