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Move subtle.go to its own package

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This commit is contained in:
Daniel Huigens 2019-05-15 00:35:39 +02:00
parent 784c5cfc2e
commit d4cdec5229
3 changed files with 4 additions and 4 deletions
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33
crypto/subtle.go
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@ -1,33 +0,0 @@
package crypto
import (
"crypto/aes"
"crypto/cipher"
"golang.org/x/crypto/scrypt"
)
// EncryptWithoutIntegrity encrypts data with AES-CTR. Note: this encryption
// mode is not secure when stored/sent on an untrusted medium.
func EncryptWithoutIntegrity(key, input, iv []byte) (output []byte, err error) {
var block cipher.Block
if block, err = aes.NewCipher(key); err != nil {
return
}
output = make([]byte, len(input))
stream := cipher.NewCTR(block, iv)
stream.XORKeyStream(output, input)
return
}
// DecryptWithoutIntegrity decrypts data encrypted with AES-CTR.
func DecryptWithoutIntegrity(key, input, iv []byte) ([]byte, error) {
// AES-CTR decryption is identical to encryption.
return EncryptWithoutIntegrity(key, input, iv)
}
// DeriveKey derives a key from a password using scrypt. N should be set to the
// highest power of 2 you can derive within 100 milliseconds.
func DeriveKey(password string, salt []byte, N int) ([]byte, error) {
return scrypt.Key([]byte(password), salt, N, 8, 1, 32)
}

31
crypto/subtle_test.go
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@ -1,31 +0,0 @@
package crypto
import (
"github.com/stretchr/testify/assert"
"encoding/hex"
"testing"
)
func TestSubtle_EncryptWithoutIntegrity(t *testing.T) {
key, _ := hex.DecodeString("9469cccfc8a8d005247f39fa3e5b35a97db456cecf18deac6d84364d0818d763")
plaintext := []byte("some plaintext")
iv, _ := hex.DecodeString("c828f258a76aad7bc828f258a76aad7b")
ciphertext, _ := EncryptWithoutIntegrity(key, plaintext, iv)
assert.Exactly(t, "14697192f7e112fc88d83380693f", hex.EncodeToString(ciphertext))
}
func TestSubtle_DecryptWithoutIntegrity(t *testing.T) {
key, _ := hex.DecodeString("9469cccfc8a8d005247f39fa3e5b35a97db456cecf18deac6d84364d0818d763")
ciphertext, _ := hex.DecodeString("14697192f7e112fc88d83380693f")
iv, _ := hex.DecodeString("c828f258a76aad7bc828f258a76aad7b")
plaintext, _ := DecryptWithoutIntegrity(key, ciphertext, iv)
assert.Exactly(t, "some plaintext", string(plaintext))
}
func TestSubtle_DeriveKey(t *testing.T) {
salt, _ := hex.DecodeString("c828f258a76aad7b")
dk, _ := DeriveKey("some password", salt, 32768)
assert.Exactly(t, "9469cccfc8a8d005247f39fa3e5b35a97db456cecf18deac6d84364d0818d763", hex.EncodeToString(dk))
}