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handle.go
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handle.go
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// Copyright 2019 gocrypt Author. All Rights Reserved.
//
// 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 gocrypt
import (
"bytes"
"crypto"
"crypto/md5"
"crypto/rsa"
"crypto/sha1"
"crypto/sha256"
"crypto/sha512"
"crypto/x509"
"encoding/base64"
"encoding/hex"
"fmt"
"hash"
)
//getHash gets the crypto hash type & hashed data in different hash type
func GetHash(data []byte, hashType Hash) (h crypto.Hash, hashed []byte, err error) {
nh, h := GetHashFunc(hashType)
hh := nh()
if _, err = hh.Write(data); err != nil {
return
}
hashed = hh.Sum(nil)
return
}
//GetHashFunc gets the crypto hash func & type in different hash type
func GetHashFunc(hashType Hash) (f func() hash.Hash, h crypto.Hash) {
switch hashType {
case SHA1:
f = sha1.New
h = crypto.SHA1
case SHA224:
f = sha256.New224
h = crypto.SHA224
case SHA256:
f = sha256.New
h = crypto.SHA256
case SHA384:
f = sha512.New384
h = crypto.SHA384
case SHA512:
f = sha512.New
h = crypto.SHA512
case SHA512_224:
f = sha512.New512_224
h = crypto.SHA512_224
case SHA512_256:
f = sha512.New512_256
h = crypto.SHA512_256
case MD5:
f = md5.New
h = crypto.MD5
default:
panic("unsupport hashType")
}
return
}
//DecodeString decodes string data to bytes in designed encoded type
func DecodeString(data string, encodedType Encode) ([]byte, error) {
var keyDecoded []byte
var err error
switch encodedType {
case String:
keyDecoded = []byte(data)
case HEX:
keyDecoded, err = hex.DecodeString(data)
case Base64:
keyDecoded, err = base64.StdEncoding.DecodeString(data)
default:
return keyDecoded, fmt.Errorf("secretInfo PublicKeyDataType unsupport")
}
return keyDecoded, err
}
//ParsePrivateKey parses private key bytes to rsa privateKey
func ParsePrivateKey(privateKeyDecoded []byte, keyType Secret) (*rsa.PrivateKey, error) {
switch keyType {
case PKCS1:
return x509.ParsePKCS1PrivateKey(privateKeyDecoded)
case PKCS8:
keyParsed, err := x509.ParsePKCS8PrivateKey(privateKeyDecoded)
return keyParsed.(*rsa.PrivateKey), err
default:
return &rsa.PrivateKey{}, fmt.Errorf("secretInfo PrivateKeyDataType unsupport")
}
}
//EncodeToString encodes data to string with encode type
func EncodeToString(data []byte, encodeType Encode) (string, error) {
switch encodeType {
case HEX:
return hex.EncodeToString(data), nil
case Base64:
return base64.StdEncoding.EncodeToString(data), nil
case String:
return string(data), nil
default:
return "", fmt.Errorf("secretInfo OutputType unsupport")
}
}
// UnPaddingPKCS7 un-padding src data to original data , adapt to PKCS5 & PKCS7
func UnPaddingPKCS7(src []byte, blockSize int) []byte {
n := len(src)
if n == 0 {
return src
}
paddingNum := int(src[n-1])
if n < paddingNum || paddingNum > blockSize {
return src
}
return src[:n-paddingNum]
}
//PKCS7Padding adds padding data using pkcs7 rules , adapt to PKCS5 &PKCS7
func PKCS7Padding(src []byte, blockSize int) []byte {
paddingNum := blockSize - len(src)%blockSize
padding := bytes.Repeat([]byte{byte(paddingNum)}, paddingNum)
return append(src, padding...)
}