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crypto: make cgo Ecrevoer not escape sig in place like precompile ecrevoer

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weixie.cui 2026-01-10 00:05:56 +08:00
parent 127d1f42bb
commit 012a15725e
1 changed files with 12 additions and 2 deletions
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14
crypto/secp256k1/secp256.go
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@ -43,6 +43,16 @@ func init() {
C.secp256k1_context_set_error_callback(context, C.callbackFunc(C.secp256k1GoPanicError), nil) C.secp256k1_context_set_error_callback(context, C.callbackFunc(C.secp256k1GoPanicError), nil)
} }
// noescape hides a pointer from escape analysis. It is the identity function
// but escape analysis doesn't think the output depends on the input.
//
//go:nosplit
//go:nocheckptr
func noescape(p unsafe.Pointer) unsafe.Pointer {
x := uintptr(p)
return unsafe.Pointer(x ^ 0)
}
var ( var (
ErrInvalidMsgLen = errors.New("invalid message length, need 32 bytes") ErrInvalidMsgLen = errors.New("invalid message length, need 32 bytes")
ErrInvalidSignatureLen = errors.New("invalid signature length") ErrInvalidSignatureLen = errors.New("invalid signature length")
@ -104,8 +114,8 @@ func RecoverPubkey(msg []byte, sig []byte) ([]byte, error) {
var ( var (
pubkey = make([]byte, 65) pubkey = make([]byte, 65)
sigdata = (*C.uchar)(unsafe.Pointer(&sig[0])) sigdata = (*C.uchar)(noescape(unsafe.Pointer(&sig[0])))
msgdata = (*C.uchar)(unsafe.Pointer(&msg[0])) msgdata = (*C.uchar)(noescape(unsafe.Pointer(&msg[0])))
) )
if C.secp256k1_ext_ecdsa_recover(context, (*C.uchar)(unsafe.Pointer(&pubkey[0])), sigdata, msgdata) == 0 { if C.secp256k1_ext_ecdsa_recover(context, (*C.uchar)(unsafe.Pointer(&pubkey[0])), sigdata, msgdata) == 0 {
return nil, ErrRecoverFailed return nil, ErrRecoverFailed