//Rename SignHash
func Sign(msg []byte, seckey []byte) []byte {
if len(seckey) != 32 {
log.Panic("Sign, Invalid seckey length")
}
if secp.SeckeyIsValid(seckey) != 1 {
log.Panic("Attempting to sign with invalid seckey")
}
if msg == nil {
log.Panic("Sign, message nil")
}
var nonce []byte = RandByte(32)
var sig []byte = make([]byte, 65)
var recid int
var cSig secp.Signature
var seckey1 secp.Number
var msg1 secp.Number
var nonce1 secp.Number
seckey1.SetBytes(seckey)
msg1.SetBytes(msg)
nonce1.SetBytes(nonce)
ret := cSig.Sign(&seckey1, &msg1, &nonce1, &recid)
if ret != 1 {
log.Panic("Secp25k1-go, Sign, signature operation failed")
}
sig_bytes := cSig.Bytes()
for i := 0; i < 64; i++ {
sig[i] = sig_bytes[i]
}
if len(sig_bytes) != 64 {
log.Fatal("Invalid signature byte count: %s", len(sig_bytes))
}
sig[64] = byte(int(recid))
if int(recid) > 4 {
log.Panic()
}
return sig
}
//generate signature in repeatable way
func SignDeterministic(msg []byte, seckey []byte, nonce_seed []byte) []byte {
nonce_seed2 := SumSHA256(nonce_seed) //deterministicly generate nonce
var sig []byte = make([]byte, 65)
var recid int
var cSig secp.Signature
var seckey1 secp.Number
var msg1 secp.Number
var nonce1 secp.Number
seckey1.SetBytes(seckey)
msg1.SetBytes(msg)
nonce1.SetBytes(nonce_seed2)
ret := cSig.Sign(&seckey1, &msg1, &nonce1, &recid)
if ret != 1 {
log.Panic("Secp256k1-go, SignDeterministic, signature fail")
}
sig_bytes := cSig.Bytes()
for i := 0; i < 64; i++ {
sig[i] = sig_bytes[i]
}
sig[64] = byte(recid)
if len(sig_bytes) != 64 {
log.Fatal("Invalid signature byte count: %s", len(sig_bytes))
}
if int(recid) > 4 {
log.Panic()
}
return sig
}