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69 lines
1.9 KiB
Go
69 lines
1.9 KiB
Go
/*
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* Mini Object Storage, (C) 2015 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package keys
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import (
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"crypto/rand"
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"encoding/base64"
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)
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// Static alphaNumeric table used for generating unique keys
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var alphaNumericTable = []byte("0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ")
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var alphaNumericTableFull = []byte("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789")
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/// helpers
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// Generate random alpha numeric value using only uppercase characters
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// takes input as size in integer
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func GetRandomAlphaNumeric(size int) ([]byte, error) {
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alpha := make([]byte, size)
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_, err := rand.Read(alpha)
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if err != nil {
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return nil, err
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}
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for i := 0; i < size; i++ {
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alpha[i] = alphaNumericTable[alpha[i]%byte(len(alphaNumericTable))]
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}
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return alpha, nil
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}
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// Generate random alpha numeric value using all alphanumeric characters
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// takes input as size in integer
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func GetRandomAlphaNumericFull(size int) ([]byte, error) {
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alphaFull := make([]byte, size)
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_, err := rand.Read(alphaFull)
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if err != nil {
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return nil, err
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}
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for i := 0; i < size; i++ {
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alphaFull[i] = alphaNumericTableFull[alphaFull[i]%byte(len(alphaNumericTableFull))]
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}
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return alphaFull, nil
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}
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// Generate random base64 numeric value from a random seed.
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func GetRandomBase64(size int) ([]byte, error) {
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rb := make([]byte, size)
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_, err := rand.Read(rb)
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if err != nil {
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return nil, err
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}
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dest := base64.StdEncoding.EncodeToString(rb)
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return []byte(dest), nil
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}
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