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feat: Add ES256, ES384 and ES512 support (#40)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| /** | ||
| * Copyright IBM Corporation 2019 | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| **/ | ||
|
|
||
| import CryptorECC | ||
| import LoggerAPI | ||
| import Foundation | ||
|
|
||
| // Class for ECDSA signing using BlueECC | ||
| @available(OSX 10.13, *) | ||
| class BlueECSigner: SignerAlgorithm { | ||
| let name: String = "ECDSA" | ||
|
|
||
| private let key: Data | ||
| private let curve: EllipticCurve | ||
|
|
||
| // Initialize a signer using .utf8 encoded PEM private key. | ||
| init(key: Data, curve: EllipticCurve) { | ||
| self.key = key | ||
| self.curve = curve | ||
| } | ||
|
|
||
| // Sign the header and claims to produce a signed JWT String | ||
| func sign(header: String, claims: String) throws -> String { | ||
| let unsignedJWT = header + "." + claims | ||
| guard let unsignedData = unsignedJWT.data(using: .utf8) else { | ||
| throw JWTError.invalidJWTString | ||
| } | ||
| let signature = try sign(unsignedData) | ||
| let signatureString = signature.base64urlEncodedString() | ||
| return header + "." + claims + "." + signatureString | ||
| } | ||
|
|
||
| // send utf8 encoded `header.claims` to BlueECC for signing | ||
| private func sign(_ data: Data) throws -> Data { | ||
| guard let keyString = String(data: key, encoding: .utf8) else { | ||
| throw JWTError.invalidPrivateKey | ||
| } | ||
| let privateKey = try ECPrivateKey(key: keyString) | ||
| guard privateKey.curve == curve else { | ||
| throw JWTError.invalidPrivateKey | ||
| } | ||
| let signedData = try data.sign(with: privateKey) | ||
| return signedData.r + signedData.s | ||
| } | ||
| } | ||
|
|
||
| // Class for ECDSA verifying using BlueECC | ||
| @available(OSX 10.13, *) | ||
| class BlueECVerifier: VerifierAlgorithm { | ||
|
|
||
| let name: String = "ECDSA" | ||
|
|
||
| private let key: Data | ||
| private let curve: EllipticCurve | ||
|
|
||
| // Initialize a verifier using .utf8 encoded PEM public key. | ||
| init(key: Data, curve: EllipticCurve) { | ||
| self.key = key | ||
| self.curve = curve | ||
| } | ||
|
|
||
| // Verify a signed JWT String | ||
| func verify(jwt: String) -> Bool { | ||
| let components = jwt.components(separatedBy: ".") | ||
| if components.count == 3 { | ||
| guard let signature = Data(base64urlEncoded: components[2]), | ||
| let jwtData = (components[0] + "." + components[1]).data(using: .utf8) | ||
| else { | ||
| return false | ||
| } | ||
| return self.verify(signature: signature, for: jwtData) | ||
| } else { | ||
| return false | ||
| } | ||
| } | ||
|
|
||
| // Send the base64URLencoded signature and `header.claims` to BlueECC for verification. | ||
| private func verify(signature: Data, for data: Data) -> Bool { | ||
| guard #available(OSX 10.13, *) else { | ||
| return false | ||
| } | ||
| do { | ||
| guard let keyString = String(data: key, encoding: .utf8) else { | ||
| return false | ||
| } | ||
| let r = signature.subdata(in: 0 ..< signature.count/2) | ||
| let s = signature.subdata(in: signature.count/2 ..< signature.count) | ||
| let signature = try ECSignature(r: r, s: s) | ||
| let publicKey = try ECPublicKey(key: keyString) | ||
| guard publicKey.curve == curve else { | ||
| return false | ||
| } | ||
| return signature.verify(plaintext: data, using: publicKey) | ||
| } | ||
| catch { | ||
| Log.error("Verification failed: \(error)") | ||
| return false | ||
| } | ||
| } | ||
| } |
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