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encoding.go
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encoding.go
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// Copyright (c) 2018 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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 utils
import (
"crypto/rsa"
"crypto/sha1"
"crypto/sha256"
"crypto/x509"
"encoding/base64"
"encoding/hex"
"encoding/pem"
"errors"
"sort"
"strconv"
)
// EncodeBase64 takes a byte slice and returns the Base64-encoded string.
func EncodeBase64(in []byte) string {
return base64.StdEncoding.EncodeToString(in)
}
// DecodeBase64 takes a Base64-encoded string and returns the decoded byte slice.
func DecodeBase64(in string) ([]byte, error) {
return base64.StdEncoding.DecodeString(in)
}
// EncodePrivateKey takes a RSA private key object, encodes it to the PEM format, and returns it as
// a byte slice.
func EncodePrivateKey(key *rsa.PrivateKey) []byte {
return pem.EncodeToMemory(&pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(key),
})
}
// EncodePrivateKeyInPKCS8 takes a RSA private key object, encodes it to the PKCS8 format, and returns it as
// a byte slice.
func EncodePrivateKeyInPKCS8(key *rsa.PrivateKey) ([]byte, error) {
bytes, err := x509.MarshalPKCS8PrivateKey(key)
if err != nil {
return nil, err
}
return pem.EncodeToMemory(&pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: bytes,
}), nil
}
// DecodeRSAPrivateKeyFromPKCS8 takes a byte slice, decodes it from the PKCS8 format, tries to convert it
// to an rsa.PrivateKey object, and returns it. In case an error occurs, it returns the error.
func DecodeRSAPrivateKeyFromPKCS8(bytes []byte) (*rsa.PrivateKey, error) {
block, _ := pem.Decode(bytes)
if block == nil || block.Type != "RSA PRIVATE KEY" {
return nil, errors.New("could not decode the PEM-encoded RSA private key")
}
key, err := x509.ParsePKCS8PrivateKey(block.Bytes)
if err != nil {
return nil, err
}
rsaKey, ok := key.(*rsa.PrivateKey)
if !ok {
return nil, errors.New("the decoded key is not an RSA private key")
}
return rsaKey, nil
}
// DecodePrivateKey takes a byte slice, decodes it from the PEM format, converts it to an rsa.PrivateKey
// object, and returns it. In case an error occurs, it returns the error.
func DecodePrivateKey(bytes []byte) (*rsa.PrivateKey, error) {
block, _ := pem.Decode(bytes)
if block == nil || block.Type != "RSA PRIVATE KEY" {
return nil, errors.New("could not decode the PEM-encoded RSA private key")
}
return x509.ParsePKCS1PrivateKey(block.Bytes)
}
// EncodeCertificate takes a certificate as a byte slice, encodes it to the PEM format, and returns
// it as byte slice.
func EncodeCertificate(certificate []byte) []byte {
return pem.EncodeToMemory(&pem.Block{
Type: "CERTIFICATE",
Bytes: certificate,
})
}
// DecodeCertificate takes a byte slice, decodes it from the PEM format, converts it to an x509.Certificate
// object, and returns it. In case an error occurs, it returns the error.
func DecodeCertificate(bytes []byte) (*x509.Certificate, error) {
block, _ := pem.Decode(bytes)
if block == nil || block.Type != "CERTIFICATE" {
return nil, errors.New("PEM block type must be CERTIFICATE")
}
return x509.ParseCertificate(block.Bytes)
}
// DecodeCertificateRequest parses the given PEM-encoded CSR.
func DecodeCertificateRequest(data []byte) (*x509.CertificateRequest, error) {
block, _ := pem.Decode(data)
if block == nil || block.Type != "CERTIFICATE REQUEST" {
return nil, errors.New("PEM block type must be CERTIFICATE REQUEST")
}
return x509.ParseCertificateRequest(block.Bytes)
}
// SHA1 takes a byte slice and returns the sha1-hashed byte slice.
func SHA1(in []byte) []byte {
s := sha1.New()
_, _ = s.Write(in)
return s.Sum(nil)
}
// SHA256 takes a byte slice and returns the sha256-hashed byte slice.
func SHA256(in []byte) []byte {
h := sha256.Sum256(in)
return h[:]
}
// EncodeSHA1 takes a byte slice and returns the sha1-hashed string (base64-encoded).
func EncodeSHA1(in []byte) string {
return EncodeBase64(SHA1(in))
}
// CreateSHA1Secret takes a username and a password and returns a sha1-schemed credentials pair as bytes.
func CreateSHA1Secret(username, password []byte) []byte {
credentials := append(username, ":{SHA}"...)
credentials = append(credentials, EncodeSHA1(password)...)
return credentials
}
// ComputeSHA1Hex computes the hexadecimal representation of the SHA1 hash of the given input byte
// slice <in>, converts it to a string and returns it (length of returned string is 40 characters).
func ComputeSHA1Hex(in []byte) string {
return hex.EncodeToString(SHA1(in))
}
// ComputeSHA256Hex computes the hexadecimal representation of the SHA256 hash of the given input byte
// slice <in>, converts it to a string and returns it.
func ComputeSHA256Hex(in []byte) string {
return hex.EncodeToString(SHA256(in))
}
// HashForMap creates a hash value for a map of type map[string]interface{} and returns it.
func HashForMap(m map[string]interface{}) string {
var (
hash string
keys []string
)
for k := range m {
keys = append(keys, k)
}
sort.Strings(keys)
for _, k := range keys {
switch v := m[k].(type) {
case string:
hash += ComputeSHA256Hex([]byte(v))
case int:
hash += ComputeSHA256Hex([]byte(strconv.Itoa(v)))
case bool:
hash += ComputeSHA256Hex([]byte(strconv.FormatBool(v)))
case []string:
for _, val := range v {
hash += ComputeSHA256Hex([]byte(val))
}
case map[string]interface{}:
hash += HashForMap(v)
case []map[string]interface{}:
for _, val := range v {
hash += HashForMap(val)
}
}
}
return ComputeSHA256Hex([]byte(hash))
}