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123 lines
3.1 KiB
Go
123 lines
3.1 KiB
Go
package starcrypto
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import (
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"bytes"
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"crypto/aes"
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"crypto/cipher"
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"crypto/rand"
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"errors"
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"io"
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)
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const (
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PKCS5PADDING = "PKCS5"
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)
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func CustomEncryptAesCFB(origData []byte, key []byte) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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encrypted := make([]byte, aes.BlockSize+len(origData))
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iv := encrypted[:aes.BlockSize]
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if _, err := io.ReadFull(rand.Reader, iv); err != nil {
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return nil, err
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}
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stream := cipher.NewCFBEncrypter(block, iv)
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stream.XORKeyStream(encrypted[aes.BlockSize:], origData)
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return encrypted, nil
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}
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func CustomDecryptAesCFB(encrypted []byte, key []byte) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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if len(encrypted) < aes.BlockSize {
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return nil, errors.New("ciphertext too short")
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}
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iv := encrypted[:aes.BlockSize]
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encrypted = encrypted[aes.BlockSize:]
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stream := cipher.NewCFBDecrypter(block, iv)
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stream.XORKeyStream(encrypted, encrypted)
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return encrypted, nil
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}
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func CustomEncryptAesCFBNoBlock(origData []byte, key []byte, iv []byte) ([]byte, error) {
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if len(iv) != 16 {
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return nil, errors.New("iv length must be 16")
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}
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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encrypted := make([]byte, len(origData))
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stream := cipher.NewCFBEncrypter(block, iv)
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stream.XORKeyStream(encrypted, origData)
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return encrypted, err
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}
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func CustomDecryptAesCFBNoBlock(encrypted []byte, key []byte, iv []byte) ([]byte, error) {
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if len(iv) != 16 {
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return nil, errors.New("iv length must be 16")
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}
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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stream := cipher.NewCFBDecrypter(block, iv)
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stream.XORKeyStream(encrypted, encrypted)
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return encrypted, err
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}
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func EncryptAesCBC(data, key []byte, iv []byte, paddingType string) ([]byte, error) {
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var content []byte
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aesBlockEncrypter, err := aes.NewCipher(key)
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switch paddingType {
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case PKCS5PADDING:
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content = PKCS5Padding(data, aesBlockEncrypter.BlockSize())
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default:
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return nil, errors.New("padding type not supported")
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}
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encrypted := make([]byte, len(content))
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if err != nil {
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return nil, err
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}
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aesEncrypter := cipher.NewCBCEncrypter(aesBlockEncrypter, iv)
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aesEncrypter.CryptBlocks(encrypted, content)
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return encrypted, nil
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}
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func PKCS5Padding(cipherText []byte, blockSize int) []byte {
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padding := blockSize - len(cipherText)%blockSize
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padText := bytes.Repeat([]byte{byte(padding)}, padding)
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return append(cipherText, padText...)
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}
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func PKCS5Trimming(encrypt []byte) []byte {
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padding := encrypt[len(encrypt)-1]
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if len(encrypt)-int(padding) < 0 {
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return nil
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}
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return encrypt[:len(encrypt)-int(padding)]
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}
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func DecryptAesCBC(src, key []byte, iv []byte, paddingType string) (data []byte, err error) {
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decrypted := make([]byte, len(src))
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var aesBlockDecrypter cipher.Block
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aesBlockDecrypter, err = aes.NewCipher(key)
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if err != nil {
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println(err.Error())
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return nil, err
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}
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aesDecrypter := cipher.NewCBCDecrypter(aesBlockDecrypter, iv)
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aesDecrypter.CryptBlocks(decrypted, src)
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switch paddingType {
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case PKCS5PADDING:
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return PKCS5Trimming(decrypted), nil
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default:
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return nil, errors.New("padding type not supported")
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}
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}
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