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random.go
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random.go
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// Copyright (C) 2022 CYBERCRYPT
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package crypto
import (
"crypto/rand"
"errors"
)
// NativeRandom implements RandomInterface.
type NativeRandom struct {
}
func (r *NativeRandom) GetBytes(n uint) ([]byte, error) {
bytes := make([]byte, n)
if _, err := rand.Read(bytes); err != nil {
return nil, err
}
return bytes, nil
}
// MockRandom is a mock implementation of RandomInterface for testing.
type MockRandom struct {
Bytes []byte
}
func (r *MockRandom) GetBytes(n uint) ([]byte, error) {
if int(n) > len(r.Bytes) {
return nil, errors.New("No more random bytes")
}
var out []byte
out, r.Bytes = r.Bytes[:n], r.Bytes[n:]
return out, nil
}