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author | Felix Lange <fjl@users.noreply.github.com> | 2018-06-12 21:26:08 +0800 |
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committer | Guillaume Ballet <gballet@gmail.com> | 2018-06-12 21:26:08 +0800 |
commit | 0255951587ef0eada5d162f3404bc481f70a2ce2 (patch) | |
tree | 6aa0c1c9405df6a88f4cbeb72e170e6e19cf55d5 /crypto/crypto.go | |
parent | 85cd64df0e3331e46f41ec86a647f1b8ff306eda (diff) | |
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crypto: replace ToECDSAPub with error-checking func UnmarshalPubkey (#16932)
ToECDSAPub was unsafe because it returned a non-nil key with nil X, Y in
case of invalid input. This change replaces ToECDSAPub with
UnmarshalPubkey across the codebase.
Diffstat (limited to 'crypto/crypto.go')
-rw-r--r-- | crypto/crypto.go | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/crypto/crypto.go b/crypto/crypto.go index 76d1ffaf6..619440e81 100644 --- a/crypto/crypto.go +++ b/crypto/crypto.go @@ -39,6 +39,8 @@ var ( secp256k1halfN = new(big.Int).Div(secp256k1N, big.NewInt(2)) ) +var errInvalidPubkey = errors.New("invalid secp256k1 public key") + // Keccak256 calculates and returns the Keccak256 hash of the input data. func Keccak256(data ...[]byte) []byte { d := sha3.NewKeccak256() @@ -122,12 +124,13 @@ func FromECDSA(priv *ecdsa.PrivateKey) []byte { return math.PaddedBigBytes(priv.D, priv.Params().BitSize/8) } -func ToECDSAPub(pub []byte) *ecdsa.PublicKey { - if len(pub) == 0 { - return nil - } +// UnmarshalPubkey converts bytes to a secp256k1 public key. +func UnmarshalPubkey(pub []byte) (*ecdsa.PublicKey, error) { x, y := elliptic.Unmarshal(S256(), pub) - return &ecdsa.PublicKey{Curve: S256(), X: x, Y: y} + if x == nil { + return nil, errInvalidPubkey + } + return &ecdsa.PublicKey{Curve: S256(), X: x, Y: y}, nil } func FromECDSAPub(pub *ecdsa.PublicKey) []byte { |