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// Copyright 2020 PingCAP, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package utils
import (
"crypto/sha256"
"crypto/sha512"
"encoding/hex"
"io"
"strings"
"github.com/pingcap/errors"
)
// CheckSHA256 returns an error if the hash of reader mismatches `sha`
func CheckSHA256(reader io.Reader, sha string) error {
shaWriter := sha256.New()
if _, err := io.Copy(shaWriter, reader); err != nil {
return errors.Trace(err)
}
checksum := hex.EncodeToString(shaWriter.Sum(nil))
if checksum != strings.TrimSpace(sha) {
return &HashValidationErr{
cipher: "sha256",
expect: sha,
actual: checksum,
}
}
return nil
}
// SHA256 returns the hash of reader
func SHA256(reader io.Reader) (string, error) {
shaWriter := sha256.New()
if _, err := io.Copy(shaWriter, reader); err != nil {
return "", errors.Trace(err)
}
checksum := hex.EncodeToString(shaWriter.Sum(nil))
return checksum, nil
}
// SHA512 returns the hash of reader
func SHA512(reader io.Reader) (string, error) {
shaWriter := sha512.New()
if _, err := io.Copy(shaWriter, reader); err != nil {
return "", errors.Trace(err)
}
checksum := hex.EncodeToString(shaWriter.Sum(nil))
return checksum, nil
}
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