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small performance patch for header encryption (#500)

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This commit is contained in:
Logan oos Even
2020-11-13 10:57:01 +01:00
committed by GitHub
parent 176e17dedf
commit 08ef50e7fc
1 changed files with 9 additions and 7 deletions
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src/header_encryption.c
+9 -7
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@@ -35,12 +35,6 @@ uint32_t packet_header_decrypt (uint8_t packet[], uint16_t packet_len,
// to full 128 bit IV
memcpy (iv, packet, 12);
// extract time stamp (first 64 bit) and checksum (last 16 bit) blended in IV
speck_he_iv_decrypt (iv, (speck_context_t*)ctx_iv);
*checksum = be16toh (((uint16_t*)iv)[5]);
*stamp = be64toh (((uint64_t*)iv)[0]);
memcpy (iv, packet, 12);
// try community name as possible key and check for magic bytes
uint32_t magic = 0x6E326E00; // ="n2n_"
@@ -54,12 +48,20 @@ uint32_t packet_header_decrypt (uint8_t packet[], uint16_t packet_len,
) {
// decrypt the complete header
speck_he (&packet[12], &packet[12], (uint8_t)(test_magic) - 12, iv, (speck_context_t*)ctx);
// extract time stamp (first 64 bit) and checksum (last 16 bit) blended in IV
speck_he_iv_decrypt (iv, (speck_context_t*)ctx_iv);
*checksum = be16toh (((uint16_t*)iv)[5]);
*stamp = be64toh (((uint64_t*)iv)[0]);
// restore original packet order
memcpy (&packet[0], &packet[16], 4);
memcpy (&packet[4], community_name, N2N_COMMUNITY_SIZE);
return (1); // successful
} else
} else {
return (0); // unsuccessful
}
}
/* ********************************************************************** */