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// Copyright 2017 Frédéric Guillot. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.
package helper
import (
"crypto/rand"
"crypto/sha256"
"encoding/base64"
"fmt"
)
// HashFromBytes returns a SHA-256 checksum of the input.
func HashFromBytes(value []byte) string {
sum := sha256.Sum256(value)
return fmt.Sprintf("%x", sum)
}
// Hash returns a SHA-256 checksum of a string.
func Hash(value string) string {
return HashFromBytes([]byte(value))
}
// GenerateRandomBytes returns random bytes.
func GenerateRandomBytes(size int) []byte {
b := make([]byte, size)
if _, err := rand.Read(b); err != nil {
panic(fmt.Errorf("Unable to generate random string: %v", err))
}
return b
}
// GenerateRandomString returns a random string.
func GenerateRandomString(size int) string {
return base64.URLEncoding.EncodeToString(GenerateRandomBytes(size))
}
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