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Expose SkToBigInt for usage from other packages & repos

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arnaucube
2020-04-22 14:53:31 +02:00
parent 14c3144613
commit d189a6bedc
1 changed files with 8 additions and 1 deletions
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9
babyjub/eddsa.go
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@@ -36,6 +36,13 @@ func NewRandPrivKey() PrivateKey {
// Scalar converts a private key into the scalar value s following the EdDSA
// standard, and using blake-512 hash.
func (k *PrivateKey) Scalar() *PrivKeyScalar {
s := SkToBigInt(k)
return NewPrivKeyScalar(s)
}
// SkToBigInt converts a private key into the *big.Int value following the
// EdDSA standard, and using blake-512 hash
func SkToBigInt(k *PrivateKey) *big.Int {
sBuf := Blake512(k[:])
sBuf32 := [32]byte{}
copy(sBuf32[:], sBuf[:32])
@@ -43,7 +50,7 @@ func (k *PrivateKey) Scalar() *PrivKeyScalar {
s := new(big.Int)
utils.SetBigIntFromLEBytes(s, sBuf32[:])
s.Rsh(s, 3)
return NewPrivKeyScalar(s)
return s
}
// Pub returns the public key corresponding to a private key.