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integrity.go
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integrity.go
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/*
* Copyright 2018 The Service Manager Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package security
import (
"bytes"
"fmt"
)
// IntegralObject interface indicates that an objects needs to be processed with regards to its integrity
type IntegralObject interface {
IntegralData() []byte
SetIntegrity([]byte)
GetIntegrity() []byte
}
// IntegrityProcessor provides functionality to validate and calculate the integrity of an integral object
//go:generate counterfeiter . IntegrityProcessor
type IntegrityProcessor interface {
ValidateIntegrity(integral IntegralObject) bool
CalculateIntegrity(integral IntegralObject) ([]byte, error)
}
// HashingIntegrityProcessor is an integrity processor that uses a hashing func to calculate the integrity
type HashingIntegrityProcessor struct {
HashingFunc func(data []byte) []byte
}
// CalculateIntegrity calculates the integrity of an integral object using a hashing func
func (h *HashingIntegrityProcessor) CalculateIntegrity(integral IntegralObject) ([]byte, error) {
if integral == nil {
return nil, fmt.Errorf("cannot calculate integrity of nil object")
}
integralData := integral.IntegralData()
if len(integralData) == 0 {
return []byte{}, nil
}
return h.HashingFunc(integralData), nil
}
// ValidateIntegrity validates the integrity of an integral object using a hashing func
func (h *HashingIntegrityProcessor) ValidateIntegrity(integral IntegralObject) bool {
if integral == nil {
return true
}
integralData := integral.IntegralData()
if len(integralData) == 0 {
return true
}
hashedData := h.HashingFunc(integralData)
integrity := integral.GetIntegrity()
return bytes.Equal(hashedData, integrity)
}