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libsecp256k1: use a static global context and add verification tests.

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This commit is contained in:
fiatjaf
2024-05-29 15:40:57 -03:00
parent 427bfc7a4b
commit 31e0645afe
4 changed files with 34 additions and 25 deletions
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libsecp256k1/bip340.go
+11 -18
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@@ -14,45 +14,38 @@ import (
"unsafe"
)
type Context struct {
ctx *C.secp256k1_context
}
var globalSecp256k1Context *C.secp256k1_context
func NewContext() (*Context, error) {
ctx := C.secp256k1_context_create(C.SECP256K1_CONTEXT_SIGN | C.SECP256K1_CONTEXT_VERIFY)
if ctx == nil {
return nil, errors.New("failed to create secp256k1 context")
func init() {
globalSecp256k1Context = C.secp256k1_context_create(C.SECP256K1_CONTEXT_SIGN | C.SECP256K1_CONTEXT_VERIFY)
if globalSecp256k1Context == nil {
panic("failed to create secp256k1 context")
}
return &Context{ctx: ctx}, nil
}
func (c *Context) Destroy() {
C.secp256k1_context_destroy(c.ctx)
}
func (c *Context) Sign(msg [32]byte, sk [32]byte) ([64]byte, error) {
func Sign(msg [32]byte, sk [32]byte) ([64]byte, error) {
var sig [64]byte
var keypair C.secp256k1_keypair
if C.secp256k1_keypair_create(c.ctx, &keypair, (*C.uchar)(unsafe.Pointer(&sk[0]))) != 1 {
if C.secp256k1_keypair_create(globalSecp256k1Context, &keypair, (*C.uchar)(unsafe.Pointer(&sk[0]))) != 1 {
return sig, errors.New("failed to parse private key")
}
var random [32]byte
rand.Read(random[:])
if C.secp256k1_schnorrsig_sign32(c.ctx, (*C.uchar)(unsafe.Pointer(&sig[0])), (*C.uchar)(unsafe.Pointer(&msg[0])), &keypair, (*C.uchar)(unsafe.Pointer(&random[0]))) != 1 {
if C.secp256k1_schnorrsig_sign32(globalSecp256k1Context, (*C.uchar)(unsafe.Pointer(&sig[0])), (*C.uchar)(unsafe.Pointer(&msg[0])), &keypair, (*C.uchar)(unsafe.Pointer(&random[0]))) != 1 {
return sig, errors.New("failed to sign message")
}
return sig, nil
}
func (c *Context) Verify(msg [32]byte, sig [64]byte, pk [32]byte) bool {
func Verify(msg [32]byte, sig [64]byte, pk [32]byte) bool {
var xonly C.secp256k1_xonly_pubkey
if C.secp256k1_xonly_pubkey_parse(c.ctx, &xonly, (*C.uchar)(unsafe.Pointer(&pk[0]))) != 1 {
if C.secp256k1_xonly_pubkey_parse(globalSecp256k1Context, &xonly, (*C.uchar)(unsafe.Pointer(&pk[0]))) != 1 {
return false
}
return C.secp256k1_schnorrsig_verify(c.ctx, (*C.uchar)(unsafe.Pointer(&sig[0])), (*C.uchar)(unsafe.Pointer(&msg[0])), 32, &xonly) == 1
return C.secp256k1_schnorrsig_verify(globalSecp256k1Context, (*C.uchar)(unsafe.Pointer(&sig[0])), (*C.uchar)(unsafe.Pointer(&msg[0])), 32, &xonly) == 1
}