//generate signature in repeatable way
func SignDeterministic(msg []byte, seckey []byte, nonce_seed []byte) []byte {
nonce := SumSHA256(nonce_seed) //deterministicly generate nonce
var sig []byte = make([]byte, 65)
var recid C.int
var msg_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&msg[0]))
var seckey_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&seckey[0]))
var nonce_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&nonce[0]))
var sig_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&sig[0]))
if C.secp256k1_ecdsa_seckey_verify(seckey_ptr) != C.int(1) {
log.Panic("Invalid secret key")
}
ret := C.secp256k1_ecdsa_sign_compact(
msg_ptr, C.int(len(msg)),
sig_ptr,
seckey_ptr,
nonce_ptr,
&recid)
sig[64] = byte(int(recid))
if int(recid) > 4 {
log.Panic()
}
if ret != 1 {
return SignDeterministic(msg, seckey, nonce_seed) //nonce invalid,retry
}
return sig
}
func GenerateKeyPair() ([]byte, []byte) {
pubkey_len := C.int(33)
const seckey_len = 32
var pubkey []byte = make([]byte, pubkey_len)
var pubkey_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&pubkey[0]))
var ret C.int
new_seckey:
var seckey []byte = RandByte(seckey_len)
var seckey_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&seckey[0]))
ret = C.secp256k1_ecdsa_seckey_verify(seckey_ptr)
if ret != 1 {
goto new_seckey
}
//for C.secp256k1_ecdsa_seckey_verify(seckey_ptr) != 1 {
// seckey = RandByte(seckey_len)
// seckey_ptr = (*C.uchar)(unsafe.Pointer(&seckey[0]))
//}
ret = C.secp256k1_ecdsa_pubkey_create(
pubkey_ptr, &pubkey_len,
seckey_ptr, 1)
if ret != 1 {
goto new_seckey
}
return pubkey, seckey
}
//generates deterministic keypair with weak SHA256 hash of seed
//internal use only
//be extremely careful with golang slice semantics
func generateDeterministicKeyPair(seed []byte) ([]byte, []byte) {
if seed == nil {
log.Panic()
}
pubkey_len := C.int(33)
const seckey_len = 32
var pubkey []byte = make([]byte, pubkey_len)
var seckey []byte = make([]byte, seckey_len)
var pubkey_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&pubkey[0]))
var seckey_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&seckey[0]))
new_seckey:
seed = SumSHA256(seed[0:32])
copy(seckey[0:32], seed[0:32])
if C.secp256k1_ecdsa_seckey_verify(seckey_ptr) != 1 {
goto new_seckey //rehash seckey until it succeeds, almost never happens
}
ret := C.secp256k1_ecdsa_pubkey_create(
pubkey_ptr, &pubkey_len,
seckey_ptr, 1)
if ret != 1 {
log.Panic("secp256k1-g0, generateDeterministicKeyPair, pubkey generation failing for valid seckey")
}
return pubkey, seckey
}
func Sign(msg []byte, seckey []byte) []byte {
var nonce []byte = RandByte(32)
var sig []byte = make([]byte, 65)
var recid C.int
var msg_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&msg[0]))
var seckey_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&seckey[0]))
var nonce_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&nonce[0]))
var sig_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&sig[0]))
if C.secp256k1_ecdsa_seckey_verify(seckey_ptr) != C.int(1) {
log.Panic("Invalid secret key")
}
ret := C.secp256k1_ecdsa_sign_compact(
msg_ptr, C.int(len(msg)),
sig_ptr,
seckey_ptr,
nonce_ptr,
&recid)
sig[64] = byte(int(recid))
if int(recid) > 4 {
log.Panic()
}
if ret != 1 {
return Sign(msg, seckey) //nonce invalid,retry
}
return sig
}
//returns nil on error
//Does not return same output as generator does
func PubkeyFromSeckey(SecKey []byte) []byte {
if len(SecKey) != 32 {
log.Panic("PubkeyFromSeckey: invalid length")
}
pubkey_len := C.int(33)
const seckey_len = 32
var pubkey []byte = make([]byte, pubkey_len)
var seckey []byte = make([]byte, seckey_len)
copy(seckey, SecKey)
var pubkey_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&pubkey[0]))
var seckey_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&seckey[0]))
//ensure that private key is valid
ret := C.secp256k1_ecdsa_seckey_verify(seckey_ptr)
if ret != 1 {
log.Panic("PubkeyFromSeckey: invalid seckey")
}
//create public key from seckey
ret = C.secp256k1_ecdsa_pubkey_create(
pubkey_ptr, &pubkey_len,
seckey_ptr, 1)
if ret != 1 {
return nil
}
return pubkey
}
//Rename ChkSeckeyValidity
func VerifySeckey(seckey []byte) int {
if len(seckey) != 32 {
return 0
}
var seckey_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&seckey[0]))
ret := C.secp256k1_ecdsa_seckey_verify(seckey_ptr)
return int(ret)
}
//Rename SignHash
func Sign(msg []byte, seckey []byte) []byte {
if len(seckey) != 32 {
log.Panic("Sign, Invalid seckey length")
}
if msg == nil {
log.Panic("Sign, message nil")
}
var nonce []byte = RandByte(32) //going to get bitcoins stolen!
var sig []byte = make([]byte, 65)
var recid C.int
var msg_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&msg[0]))
var seckey_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&seckey[0]))
var nonce_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&nonce[0]))
var sig_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&sig[0]))
if C.secp256k1_ecdsa_seckey_verify(seckey_ptr) != C.int(1) {
log.Panic() //invalid seckey
}
ret := C.secp256k1_ecdsa_sign_compact(
msg_ptr, C.int(len(msg)),
sig_ptr,
seckey_ptr,
nonce_ptr,
&recid)
sig[64] = byte(int(recid))
if int(recid) > 4 {
log.Panic()
}
if ret != 1 {
return Sign(msg, seckey) //nonce invalid,retry
}
return sig
}
