mirror of
https://github.com/aljazceru/ark.git
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a8cf0ed204
* tx history * fix * fix * pr review refactor * pr review refactor * fix * pr review refactor * exclude gosec G115 Integer Overflow Conversion * ignore some gosec errs * ignore some gosec errs * ignore createdat in test assertion * Fixes (#7) * Fixes * Fixes * Update golang (#8) * update gha golangci-lint version * update gha golangci-lint version * fix linting issues * fix linting issues * fix linting issues * add linter timeout --------- Co-authored-by: Pietralberto Mazza <18440657+altafan@users.noreply.github.com>
108 lines
2.4 KiB
Go
108 lines
2.4 KiB
Go
package utils
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/rand"
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"fmt"
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"runtime/debug"
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"golang.org/x/crypto/scrypt"
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)
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type cypher struct{}
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func NewAES128Cypher() *cypher {
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return &cypher{}
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}
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func (c *cypher) Encrypt(privateKey, password []byte) ([]byte, error) {
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// Due to https://github.com/golang/go/issues/7168.
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// This call makes sure that memory is freed in case the GC doesn't do that
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// right after the encryption/decryption.
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defer debug.FreeOSMemory()
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if len(privateKey) == 0 {
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return nil, fmt.Errorf("missing plaintext private key")
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}
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if len(password) == 0 {
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return nil, fmt.Errorf("missing encryption password")
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}
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key, salt, err := deriveKey(password, nil)
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if err != nil {
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return nil, err
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}
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blockCipher, 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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gcm, err := cipher.NewGCM(blockCipher)
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if err != nil {
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return nil, err
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}
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nonce := make([]byte, gcm.NonceSize())
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if _, err = rand.Read(nonce); err != nil {
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return nil, err
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}
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ciphertext := gcm.Seal(nonce, nonce, privateKey, nil)
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ciphertext = append(ciphertext, salt...)
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return ciphertext, nil
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}
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func (c *cypher) decrypt(encrypted, password []byte) ([]byte, error) {
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defer debug.FreeOSMemory()
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if len(encrypted) == 0 {
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return nil, fmt.Errorf("missing encrypted mnemonic")
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}
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if len(password) == 0 {
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return nil, fmt.Errorf("missing decryption password")
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}
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salt := encrypted[len(encrypted)-32:]
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data := encrypted[:len(encrypted)-32]
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key, _, err := deriveKey(password, salt)
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if err != nil {
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return nil, err
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}
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blockCipher, 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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gcm, err := cipher.NewGCM(blockCipher)
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if err != nil {
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return nil, err
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}
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nonce, text := data[:gcm.NonceSize()], data[gcm.NonceSize():]
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// #nosec G407
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plaintext, err := gcm.Open(nil, nonce, text, nil)
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if err != nil {
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return nil, fmt.Errorf("invalid password")
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}
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return plaintext, nil
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}
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// deriveKey derives a 32 byte array key from a custom passhprase
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func deriveKey(password, salt []byte) ([]byte, []byte, error) {
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if salt == nil {
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salt = make([]byte, 32)
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if _, err := rand.Read(salt); err != nil {
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return nil, nil, err
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}
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}
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// 2^20 = 1048576 recommended length for key-stretching
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// check the doc for other recommended values:
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// https://godoc.org/golang.org/x/crypto/scrypt
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key, err := scrypt.Key(password, salt, 1048576, 8, 1, 32)
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if err != nil {
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return nil, nil, err
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}
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return key, salt, nil
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}
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