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Rounded out the rest of the SmartCardStore API.

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This commit is contained in:
Maxwell Swadling 2023-02-28 15:40:21 +10:00
parent f54b2a33bf
commit d7b5cca182
3 changed files with 126 additions and 1 deletions
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4
Sources/Packages/Sources/SecretKit/OpenSSH/OpenSSHKeyWriter.swift
View File

@ -64,6 +64,8 @@ extension OpenSSHKeyWriter {
switch algorithm {
case .ellipticCurve:
return "ecdsa-sha2-nistp" + String(describing: length)
case .rsa:
return "rsa-sha2-512"
}
}
@ -76,6 +78,8 @@ extension OpenSSHKeyWriter {
switch algorithm {
case .ellipticCurve:
return "nistp" + String(describing: length)
case .rsa:
return "rsa-sha2-512"
}
}

12
Sources/Packages/Sources/SecretKit/Types/Secret.swift
View File

@ -20,6 +20,7 @@ public protocol Secret: Identifiable, Hashable {
public enum Algorithm: Hashable {
case ellipticCurve
case rsa
/// Initializes the Algorithm with a secAttr representation of an algorithm.
/// - Parameter secAttr: the secAttr, represented as an NSNumber.
@ -28,8 +29,19 @@ public enum Algorithm: Hashable {
switch secAttrString {
case kSecAttrKeyTypeEC:
self = .ellipticCurve
case kSecAttrKeyTypeRSA:
self = .rsa
default:
fatalError()
}
}
public var secAttrKeyType: CFString {
switch self {
case .ellipticCurve:
return kSecAttrKeyTypeEC
case .rsa:
return kSecAttrKeyTypeRSA
}
}
}

111
Sources/Packages/Sources/SmartCardSecretKit/SmartCardStore.swift
View File

@ -74,6 +74,10 @@ extension SmartCard {
signatureAlgorithm = .ecdsaSignatureMessageX962SHA256
case (.ellipticCurve, 384):
signatureAlgorithm = .ecdsaSignatureMessageX962SHA384
case (.rsa, 1024):
signatureAlgorithm = .rsaSignatureMessagePKCS1v15SHA512
case (.rsa, 2048):
signatureAlgorithm = .rsaSignatureMessagePKCS1v15SHA512
default:
fatalError()
}
@ -82,6 +86,112 @@ extension SmartCard {
}
return signature as Data
}
public func verify(data: Data, signature: Data, with secret: SecretType) throws -> Bool {
let attributes = KeychainDictionary([
kSecAttrKeyType: secret.algorithm.secAttrKeyType,
kSecAttrKeySizeInBits: secret.keySize,
kSecAttrKeyClass: kSecAttrKeyClassPublic
])
var encryptError: SecurityError?
var untyped: CFTypeRef? = SecKeyCreateWithData(secret.publicKey as CFData, attributes, &encryptError)
guard let untypedSafe = untyped else {
throw KeychainError(statusCode: errSecSuccess)
}
let key = untypedSafe as! SecKey
let signatureAlgorithm: SecKeyAlgorithm
switch (secret.algorithm, secret.keySize) {
case (.ellipticCurve, 256):
signatureAlgorithm = .ecdsaSignatureMessageX962SHA256
case (.ellipticCurve, 384):
signatureAlgorithm = .ecdsaSignatureMessageX962SHA384
case (.rsa, 1024):
signatureAlgorithm = .rsaSignatureMessagePKCS1v15SHA512
case (.rsa, 2048):
signatureAlgorithm = .rsaSignatureMessagePKCS1v15SHA512
default:
fatalError()
}
let signature = SecKeyVerifySignature(key, signatureAlgorithm, data as CFData, signature as CFData, &encryptError)
if !signature {
throw SigningError(error: encryptError)
}
return signature
}
public func encrypt(data: Data, with secret: SecretType) throws -> Data {
let attributes = KeychainDictionary([
kSecAttrKeyType: secret.algorithm.secAttrKeyType,
kSecAttrKeySizeInBits: secret.keySize,
kSecAttrKeyClass: kSecAttrKeyClassPublic
])
var encryptError: SecurityError?
let untyped: CFTypeRef? = SecKeyCreateWithData(secret.publicKey as CFData, attributes, &encryptError)
guard let untypedSafe = untyped else {
throw KeychainError(statusCode: errSecSuccess)
}
let key = untypedSafe as! SecKey
let signatureAlgorithm: SecKeyAlgorithm
switch (secret.algorithm, secret.keySize) {
case (.ellipticCurve, 256):
signatureAlgorithm = .eciesEncryptionCofactorVariableIVX963SHA256AESGCM
case (.ellipticCurve, 384):
signatureAlgorithm = .eciesEncryptionCofactorVariableIVX963SHA256AESGCM
case (.rsa, 1024):
signatureAlgorithm = .rsaEncryptionOAEPSHA512AESGCM
case (.rsa, 2048):
signatureAlgorithm = .rsaEncryptionOAEPSHA512AESGCM
default:
fatalError()
}
guard let signature = SecKeyCreateEncryptedData(key, signatureAlgorithm, data as CFData, &encryptError) else {
throw SigningError(error: encryptError)
}
return signature as Data
}
public func decrypt(data: Data, with secret: SecretType) throws -> Data {
guard let tokenID = tokenID else { fatalError() }
let context = LAContext()
context.localizedReason = "decrypt a file using secret \"\(secret.name)\""
context.localizedCancelTitle = "Deny"
let attributes = KeychainDictionary([
kSecClass: kSecClassKey,
kSecAttrKeyClass: kSecAttrKeyClassPrivate,
kSecAttrApplicationLabel: secret.id as CFData,
kSecAttrTokenID: tokenID,
kSecUseAuthenticationContext: context,
kSecReturnRef: true
])
var untyped: CFTypeRef?
let status = SecItemCopyMatching(attributes, &untyped)
if status != errSecSuccess {
throw KeychainError(statusCode: status)
}
guard let untypedSafe = untyped else {
throw KeychainError(statusCode: errSecSuccess)
}
let key = untypedSafe as! SecKey
var encryptError: SecurityError?
let signatureAlgorithm: SecKeyAlgorithm
switch (secret.algorithm, secret.keySize) {
case (.ellipticCurve, 256):
signatureAlgorithm = .eciesEncryptionStandardX963SHA256AESGCM
case (.ellipticCurve, 384):
signatureAlgorithm = .eciesEncryptionStandardX963SHA384AESGCM
case (.rsa, 1024):
signatureAlgorithm = .rsaEncryptionOAEPSHA512AESGCM
case (.rsa, 2048):
signatureAlgorithm = .rsaEncryptionOAEPSHA512AESGCM
default:
fatalError()
}
guard let signature = SecKeyCreateDecryptedData(key, signatureAlgorithm, data as CFData, &encryptError) else {
throw SigningError(error: encryptError)
}
return signature as Data
}
public func existingPersistedAuthenticationContext(secret: SmartCard.Secret) -> PersistedAuthenticationContext? {
nil
@ -140,7 +250,6 @@ extension SmartCard.Store {
let attributes = KeychainDictionary([
kSecClass: kSecClassKey,
kSecAttrTokenID: tokenID,
kSecAttrKeyType: kSecAttrKeyTypeEC, // Restrict to EC
kSecReturnRef: true,
kSecMatchLimit: kSecMatchLimitAll,
kSecReturnAttributes: true