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crypto: check key for validity

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This commit is contained in:
Alexander Neumann 2015-11-22 20:42:20 +01:00
parent 4f6bc754b8
commit b841eb4c54
1 changed files with 8 additions and 0 deletions
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8
crypto/crypto.go
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@ -233,6 +233,10 @@ var ErrInvalidCiphertext = errors.New("invalid ciphertext, same slice used for p
// necessary. ciphertext and plaintext may not point to (exactly) the same
// slice or non-intersecting slices.
func Encrypt(ks *Key, ciphertext []byte, plaintext []byte) ([]byte, error) {
if !ks.Valid() {
return nil, errors.New("invalid key")
}
ciphertext = ciphertext[:cap(ciphertext)]
// test for same slice, if possible
@ -271,6 +275,10 @@ func Encrypt(ks *Key, ciphertext []byte, plaintext []byte) ([]byte, error) {
// IV || Ciphertext || MAC. plaintext and ciphertext may point to (exactly) the
// same slice.
func Decrypt(ks *Key, plaintext []byte, ciphertextWithMac []byte) ([]byte, error) {
if !ks.Valid() {
return nil, errors.New("invalid key")
}
// check for plausible length
if len(ciphertextWithMac) < ivSize+macSize {
panic("trying to decrypt invalid data: ciphertext too small")