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Add tag validation during decrypt

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This commit is contained in:
Neeraj Gupta 2023-10-21 09:00:33 +05:30
parent f05be385d5
commit 33bda4cbb7
1 changed files with 15 additions and 12 deletions
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27
internal/crypto/stream.go
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@ -25,7 +25,8 @@ const (
StreamKeyBytes = chacha20poly1305.KeySize
StreamHeaderBytes = chacha20poly1305.NonceSizeX
StreamABytes = 16 + 1
// crypto_secretstream_xchacha20poly1305_ABYTES
XChaCha20Poly1305IetfABYTES = 16 + 1
)
const crypto_core_hchacha20_INPUTBYTES = 16
@ -129,7 +130,7 @@ func (s *encryptor) Push(plain []byte, tag byte) ([]byte, error) {
//sodium_misuse();
//}
out := make([]byte, mlen+StreamABytes)
out := make([]byte, mlen+XChaCha20Poly1305IetfABYTES)
chacha, err := chacha20.NewUnauthenticatedCipher(s.k[:], s.nonce[:])
if err != nil {
@ -240,7 +241,7 @@ func NewDecryptor(key, header []byte) (Decryptor, error) {
}
func (s *decryptor) Pull(cipher []byte) ([]byte, byte, error) {
inlen := len(cipher)
ciperLen := len(cipher)
//crypto_onetimeauth_poly1305_state poly1305_state;
var poly1305State [32]byte
@ -253,8 +254,8 @@ func (s *decryptor) Pull(cipher []byte) ([]byte, byte, error) {
//unsigned char mac[crypto_onetimeauth_poly1305_BYTES];
//const unsigned char *c;
//const unsigned char *stored_mac;
//unsigned long long mlen;
//unsigned char tag;
//unsigned long long mlen; // length of the returned message
//unsigned char tag; // for the return value
//
//if (mlen_p != NULL) {
//*mlen_p = 0U;
@ -263,24 +264,26 @@ func (s *decryptor) Pull(cipher []byte) ([]byte, byte, error) {
//*tag_p = 0xff;
//}
//if (inlen < crypto_secretstream_xchacha20poly1305_ABYTES) {
//return -1;
//}
if inlen < StreamABytes {
/*
if (inlen < crypto_secretstream_xchacha20poly1305_ABYTES) {
return -1;
}
mlen = inlen - crypto_secretstream_xchacha20poly1305_ABYTES;
*/
if ciperLen < XChaCha20Poly1305IetfABYTES {
return nil, 0, invalidInput
}
//mlen = inlen - crypto_secretstream_xchacha20poly1305_ABYTES;
mlen := inlen - StreamABytes
mlen := ciperLen - XChaCha20Poly1305IetfABYTES
//if (mlen > crypto_secretstream_xchacha20poly1305_MESSAGEBYTES_MAX) {
//sodium_misuse();
//}
//crypto_stream_chacha20_ietf(block, sizeof block, state->nonce, state->k);
chacha, err := chacha20.NewUnauthenticatedCipher(s.k[:], s.nonce[:])
if err != nil {
return nil, 0, err
}
//crypto_stream_chacha20_ietf(block, sizeof block, state->nonce, state->k);
chacha.XORKeyStream(block[:], block[:])
//crypto_onetimeauth_poly1305_init(&poly1305_state, block);