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crypto/internal/boring: tolerate empty ECDSA signatures

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VerifyASN1 became directly reachable without encoding/decoding in
CL 353849, so it's now possible for the signature to be empty.

Change-Id: I37d6400945ab541120180bf73335e0ec93322947
Reviewed-on: https://go-review.googlesource.com/c/go/+/452635
Reviewed-by: Roland Shoemaker <roland@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Auto-Submit: Filippo Valsorda <filippo@golang.org>
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
Filippo Valsorda 2022-11-21 23:24:58 +01:00 committed by Gopher Robot
parent f41fdc1267
commit 6a72514076
1 changed files with 2 additions and 3 deletions
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5
src/crypto/internal/boring/ecdsa.go
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@ -11,7 +11,6 @@ import "C"
import (
"errors"
"runtime"
"unsafe"
)
type ecdsaSignature struct {
@ -124,7 +123,7 @@ func SignMarshalECDSA(priv *PrivateKeyECDSA, hash []byte) ([]byte, error) {
size := C._goboringcrypto_ECDSA_size(priv.key)
sig := make([]byte, size)
var sigLen C.uint
if C._goboringcrypto_ECDSA_sign(0, base(hash), C.size_t(len(hash)), (*C.uint8_t)(unsafe.Pointer(&sig[0])), &sigLen, priv.key) == 0 {
if C._goboringcrypto_ECDSA_sign(0, base(hash), C.size_t(len(hash)), base(sig), &sigLen, priv.key) == 0 {
return nil, fail("ECDSA_sign")
}
runtime.KeepAlive(priv)
@ -132,7 +131,7 @@ func SignMarshalECDSA(priv *PrivateKeyECDSA, hash []byte) ([]byte, error) {
}
func VerifyECDSA(pub *PublicKeyECDSA, hash []byte, sig []byte) bool {
ok := C._goboringcrypto_ECDSA_verify(0, base(hash), C.size_t(len(hash)), (*C.uint8_t)(unsafe.Pointer(&sig[0])), C.size_t(len(sig)), pub.key) != 0
ok := C._goboringcrypto_ECDSA_verify(0, base(hash), C.size_t(len(hash)), base(sig), C.size_t(len(sig)), pub.key) != 0
runtime.KeepAlive(pub)
return ok
}