struct SigV4aKeyPair
s12SotoSignerV413SigV4aKeyPairV
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import SotoSignerV4
init(credential: some Credential)
static func compareConstantTime(lhs: [UInt8], rhs: [UInt8]) -> Int8
static func makeDerivedKey(bytes: [UInt8]) throws -> DerivedKeyResult
let key: P256.Signing.PrivateKey
func sign(_ string: String) throws -> String
enum DerivedKeyResult