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encryption.go
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encryption.go
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// Copyright (c) 2020 Xelaj Software
//
// This file is a part of go-dry package.
// See https://github.com/xelaj/go-dry/blob/master/LICENSE for details
package dry
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"crypto/sha1"
"encoding/hex"
"io"
"sync"
"golang.org/x/crypto/sha3"
)
var (
AES = aesCipherPool{NewSyncPoolMap()}
)
// The pool uses sync.Pool internally.
type aesCipherPool struct {
poolMap *SyncPoolMap
}
func (pool *aesCipherPool) forKey(key []byte) *sync.Pool {
return pool.poolMap.GetOrAddNew(string(key), func() any {
block, err := aes.NewCipher(key)
if err != nil {
panic(err)
}
return block
})
}
func (pool *aesCipherPool) GetCypher(key []byte) cipher.Block {
return pool.forKey(key).Get().(cipher.Block)
}
func (pool *aesCipherPool) ReturnCypher(key []byte, block cipher.Block) {
pool.forKey(key).Put(block)
}
// EncryptAES encrypts plaintext using AES with the given key.
// key should be either 16, 24, or 32 bytes to select
// AES-128, AES-192, or AES-256.
// plaintext must not be shorter than key.
func EncryptAES(key []byte, plaintext []byte) []byte {
block := AES.GetCypher(key)
defer AES.ReturnCypher(key, block)
// The IV needs to be unique, but not secure. Therefore it's common to
// include it at the beginning of the ciphertext.
ciphertext := make([]byte, aes.BlockSize+len(plaintext))
iv := ciphertext[:aes.BlockSize]
if _, err := io.ReadFull(rand.Reader, iv); err != nil {
panic(err)
}
stream := cipher.NewCFBEncrypter(block, iv)
stream.XORKeyStream(ciphertext[aes.BlockSize:], plaintext)
return ciphertext
}
// DecryptAES decrypts ciphertext using AES with the given key.
// key should be either 16, 24, or 32 bytes to select
// AES-128, AES-192, or AES-256.
func DecryptAES(key []byte, ciphertext []byte) []byte {
block := AES.GetCypher(key)
defer AES.ReturnCypher(key, block)
// The IV needs to be unique, but not secure. Therefore it's common to
// include it at the beginning of the ciphertext.
if len(ciphertext) < aes.BlockSize {
panic("ciphertext too short")
}
iv := ciphertext[:aes.BlockSize]
ciphertext = ciphertext[aes.BlockSize:]
stream := cipher.NewCFBDecrypter(block, iv)
// XORKeyStream can work in-place if the two arguments are the same.
stream.XORKeyStream(ciphertext, ciphertext)
return ciphertext
}
func Sha3256(text string) []byte {
h := sha3.New256()
h.Write([]byte(text))
return h.Sum(nil)
}
func Sha3512(text string) []byte {
h := sha3.New512()
h.Write([]byte(text))
return h.Sum(nil)
}
func Sha3512Hex(text string) string {
h := sha3.New512()
h.Write([]byte(text))
return hex.EncodeToString(h.Sum(nil))
}
func Sha1(input string) []byte {
r := sha1.Sum([]byte(input))
return r[:]
}
func Sha1Byte(input []byte) []byte {
r := sha1.Sum(input)
return r[:]
}