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sm2: recover public keys

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Sun Yimin 2024-06-01 10:31:29 +08:00 committed by GitHub
parent 63affe5127
commit 7bb7903ce2
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
1 changed files with 2 additions and 9 deletions
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11
sm2/sm2.go
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@ -747,18 +747,11 @@ func RecoverPublicKeysFromSM2Signature(hash, sig []byte) ([]*ecdsa.PublicKey, er
} }
// Rx = r - e // Rx = r - e
if r.CmpGeq(e) == 0 { r.Sub(e, c.N)
// If r < e, then Rx = N - e + r
n0 := bigmod.NewNat().Set(c.N.Nat())
n0.Sub(e, c.P)
r.Add(n0, c.P)
} else {
r.Sub(e, c.P)
}
if r.IsZero() == 1 { if r.IsZero() == 1 {
return nil, ErrInvalidSignature return nil, ErrInvalidSignature
} }
rBytes = r.Bytes(c.P) rBytes = r.Bytes(c.N)
tmp := make([]byte, len(rBytes)+1) tmp := make([]byte, len(rBytes)+1)
copy(tmp[1:], rBytes) copy(tmp[1:], rBytes)
compressFlags := []byte{compressed02, compressed03} compressFlags := []byte{compressed02, compressed03}