//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 Sign(msg []byte, seckey []byte) ([]byte, error) {
nonce := randentropy.GetEntropyCSPRNG(32)
var sig []byte = make([]byte, 65)
var recid C.int
var msg_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&msg[0]))
var sig_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&sig[0]))
var seckey_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&seckey[0]))
var noncefp_ptr = &(*C.secp256k1_nonce_function_default)
var ndata_ptr = unsafe.Pointer(&nonce[0])
if C.secp256k1_ec_seckey_verify(seckey_ptr) != C.int(1) {
return nil, errors.New("Invalid secret key")
}
ret := C.secp256k1_ecdsa_sign_compact(
msg_ptr,
sig_ptr,
seckey_ptr,
noncefp_ptr,
ndata_ptr,
&recid)
sig[64] = byte(int(recid))
if ret != C.int(1) {
// nonce invalid, retry
return Sign(msg, seckey)
}
return sig, nil
}
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
}
//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
}
