CSecp256k1.swift
Swift C module for bitcoin secp256k1 library.
Installation
CSecp256k1.swift deploys to macOS, iOS, tvOS, watchOS and Linux. It has been tested on the latest OS releases only however, as the module uses very few platform-provided APIs, there should be very few issues with earlier versions.
Setup instructions:
-
Swift Package Manager: Add this to the dependency section of your
Package.swiftmanifest:.package(url: "https://github.com/tesseract-one/CSecp256k1.swift.git", from: "0.1.0")
-
CocoaPods: Put this in your
Podfile:pod 'CSecp256k1', '~> 0.1'
Usage Examples
Sign and Verify
import CSecp256k1
let privKey: [UInt8] = [
0x9d, 0x61, 0xb1, 0x9d, 0xef, 0xfd, 0x5a, 0x60, 0xba,
0x84, 0x4a, 0xf4, 0x92, 0xec, 0x2c, 0xc4, 0x44, 0x49,
0xc5, 0x69, 0x7b, 0x32, 0x69, 0x19, 0x70, 0x3b, 0xac,
0x03, 0x1c, 0xae, 0x7f, 0x60
]
let data = [UInt8](repeating: 0, count: 32)
let context: OpaquePointer! = secp256k1_context_create(
UInt32(SECP256K1_CONTEXT_SIGN|SECP256K1_CONTEXT_VERIFY)
)
var signature = secp256k1_ecdsa_recoverable_signature()
let res = secp256k1_ecdsa_sign_recoverable(context, &signature, data, privKey, nil, nil)
assert(res > 0)
var pubKey = secp256k1_pubkey()
let res2 = secp256k1_ec_pubkey_create(context, &pubKey, privKey)
assert(res2 > 0)
var ssig = secp256k1_ecdsa_signature()
let res3 = secp256k1_ecdsa_recoverable_signature_convert(context, &ssig, &signature)
assert(res3 > 0)
let isValid = secp256k1_ecdsa_verify(context, &ssig, hash, &pubKey)
assert(isValid == 1)License
CSecp256k1.swift can be used, distributed and modified under the Apache 2.0 license.
Bitcoin secp256k1 can be used, distributed and modified under the MIT license.
