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edwards25519: expand the SetUniformBytes docs

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This commit is contained in:
Filippo Valsorda 2021-06-07 01:08:54 +02:00
parent ed0a5aec82
commit 26ce6fc341
1 changed files with 7 additions and 4 deletions
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11
scalar.go
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@ -22,7 +22,7 @@ import (
// The zero value is a valid zero element.
type Scalar struct {
// s is the Scalar value in little-endian. The value is always reduced
// between operations.
// modulo l between operations.
s [32]byte
}
@ -79,9 +79,12 @@ func (s *Scalar) Set(x *Scalar) *Scalar {
return s
}
// SetUniformBytes sets s to an uniformly distributed value given 64 uniformly
// distributed random bytes. If x is not of the right length, SetUniformBytes
// returns nil and an error, and the receiver is unchanged.
// SetUniformBytes sets s = x mod l, where x is a 64-byte little-endian integer.
// If x is not of the right length, SetUniformBytes returns nil and an error,
// and the receiver is unchanged.
//
// SetUniformBytes can be used to set s to an uniformly distributed value given
// 64 uniformly distributed random bytes.
func (s *Scalar) SetUniformBytes(x []byte) (*Scalar, error) {
if len(x) != 64 {
return nil, errors.New("edwards25519: invalid SetUniformBytes input length")