60 lines
1.5 KiB
Go
60 lines
1.5 KiB
Go
package pkcs8
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import (
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"bytes"
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"crypto/cipher"
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"crypto/des" //nolint:gosec
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"encoding/asn1"
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"fmt"
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pkcs8lib "github.com/youmark/pkcs8"
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)
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func init() { //nolint:gochecknoinits
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pkcs8lib.RegisterCipher(oidDESCBC, newCipherDESCBCBlock)
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}
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func newCipherDESCBCBlock() pkcs8lib.Cipher { //nolint:ireturn
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return cipherDESCBC{}
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}
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type cipherDESCBC struct{}
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func (c cipherDESCBC) IVSize() int {
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return des.BlockSize
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}
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func (c cipherDESCBC) KeySize() int {
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return 8 //nolint:gomnd
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}
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func (c cipherDESCBC) OID() asn1.ObjectIdentifier {
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return oidDESCBC
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}
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func (c cipherDESCBC) Encrypt(key, iv, plaintext []byte) ([]byte, error) {
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block, err := des.NewCipher(key) //nolint:gosec
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if err != nil {
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return nil, fmt.Errorf("creating DES cipher: %w", err)
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}
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blockEncrypter := cipher.NewCBCEncrypter(block, iv)
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paddingLen := block.BlockSize() - (len(plaintext) % block.BlockSize())
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ciphertext := make([]byte, len(plaintext)+paddingLen)
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copy(ciphertext, plaintext)
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copy(ciphertext[len(plaintext):],
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bytes.Repeat([]byte{byte(paddingLen)}, paddingLen))
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blockEncrypter.CryptBlocks(ciphertext, ciphertext)
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return ciphertext, nil
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}
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func (c cipherDESCBC) Decrypt(key, iv, ciphertext []byte) ([]byte, error) {
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block, err := des.NewCipher(key) //nolint:gosec
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if err != nil {
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return nil, fmt.Errorf("creating DES cipher: %w", err)
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}
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blockDecrypter := cipher.NewCBCDecrypter(block, iv)
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plaintext := make([]byte, len(ciphertext))
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blockDecrypter.CryptBlocks(plaintext, ciphertext)
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return plaintext, nil
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}
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