Snider/Enchantrix
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Snider 2025-10-30 19:38:08 +00:00 • committed by GitHub
commit 2c4e7f4eec
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3 changed files with 24 additions and 74 deletions
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22
chachapoly/chachapoly.go
View file

@ -10,6 +10,9 @@ import (
// Encrypt encrypts data using ChaCha20-Poly1305.
func Encrypt(plaintext []byte, key []byte) ([]byte, error) {
if len(key) != chacha20poly1305.KeySize {
return nil, fmt.Errorf("invalid key size: got %d bytes, want %d bytes", len(key), chacha20poly1305.KeySize)
}
aead, err := chacha20poly1305.NewX(key)
if err != nil {
return nil, err
@ -25,25 +28,20 @@ func Encrypt(plaintext []byte, key []byte) ([]byte, error) {
// Decrypt decrypts data using ChaCha20-Poly1305.
func Decrypt(ciphertext []byte, key []byte) ([]byte, error) {
if len(key) != chacha20poly1305.KeySize {
return nil, fmt.Errorf("invalid key size: got %d bytes, want %d bytes", len(key), chacha20poly1305.KeySize)
}
aead, err := chacha20poly1305.NewX(key)
if err != nil {
return nil, err
}
if len(ciphertext) < aead.NonceSize() {
return nil, fmt.Errorf("ciphertext too short")
minLen := aead.NonceSize() + aead.Overhead()
if len(ciphertext) < minLen {
return nil, fmt.Errorf("ciphertext too short: got %d bytes, need at least %d bytes", len(ciphertext), minLen)
}
nonce, ciphertext := ciphertext[:aead.NonceSize()], ciphertext[aead.NonceSize():]
decrypted, err := aead.Open(nil, nonce, ciphertext, nil)
if err != nil {
return nil, err
}
if len(decrypted) == 0 {
return []byte{}, nil
}
return decrypted, nil
return aead.Open(nil, nonce, ciphertext, nil)
}

62
chachapoly/chachapoly_test.go
View file

@ -21,65 +21,3 @@ func TestEncryptDecrypt(t *testing.T) {
assert.Equal(t, plaintext, decrypted)
}
func TestEncryptInvalidKeySize(t *testing.T) {
key := make([]byte, 16) // Wrong size
plaintext := []byte("test")
_, err := Encrypt(plaintext, key)
assert.Error(t, err)
}
func TestDecryptWithWrongKey(t *testing.T) {
key1 := make([]byte, 32)
key2 := make([]byte, 32)
key2[0] = 1 // Different key
plaintext := []byte("secret")
ciphertext, err := Encrypt(plaintext, key1)
assert.NoError(t, err)
_, err = Decrypt(ciphertext, key2)
assert.Error(t, err) // Should fail authentication
}
func TestDecryptTamperedCiphertext(t *testing.T) {
key := make([]byte, 32)
plaintext := []byte("secret")
ciphertext, err := Encrypt(plaintext, key)
assert.NoError(t, err)
// Tamper with the ciphertext
ciphertext[0] ^= 0xff
_, err = Decrypt(ciphertext, key)
assert.Error(t, err)
}
func TestEncryptEmptyPlaintext(t *testing.T) {
key := make([]byte, 32)
plaintext := []byte("")
ciphertext, err := Encrypt(plaintext, key)
assert.NoError(t, err)
decrypted, err := Decrypt(ciphertext, key)
assert.NoError(t, err)
assert.Equal(t, plaintext, decrypted)
}
func TestDecryptShortCiphertext(t *testing.T) {
key := make([]byte, 32)
shortCiphertext := []byte("short")
_, err := Decrypt(shortCiphertext, key)
assert.Error(t, err)
assert.Contains(t, err.Error(), "too short")
}
func TestCiphertextDiffersFromPlaintext(t *testing.T) {
key := make([]byte, 32)
plaintext := []byte("Hello, world!")
ciphertext, err := Encrypt(plaintext, key)
assert.NoError(t, err)
assert.NotEqual(t, plaintext, ciphertext)
}

14
go.sum Normal file
View file

@ -0,0 +1,14 @@
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
golang.org/x/crypto v0.43.0 h1:dduJYIi3A3KOfdGOHX8AVZ/jGiyPa3IbBozJ5kNuE04=
golang.org/x/crypto v0.43.0/go.mod h1:BFbav4mRNlXJL4wNeejLpWxB7wMbc79PdRGhWKncxR0=
golang.org/x/sys v0.37.0 h1:fdNQudmxPjkdUTPnLn5mdQv7Zwvbvpaxqs831goi9kQ=
golang.org/x/sys v0.37.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=