diff options
Diffstat (limited to 'src/include/gnunet_common.h')
| -rw-r--r-- | src/include/gnunet_common.h | 34 |
1 files changed, 33 insertions, 1 deletions
diff --git a/src/include/gnunet_common.h b/src/include/gnunet_common.h index 6d9652a16..76c2b9352 100644 --- a/src/include/gnunet_common.h +++ b/src/include/gnunet_common.h @@ -1,6 +1,6 @@ /* This file is part of GNUnet. - Copyright (C) 2006-2013 GNUnet e.V. + Copyright (C) 2006-2020 GNUnet e.V. GNUnet is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published @@ -1089,6 +1089,9 @@ GNUNET_ntoh_double (double d); /** * Compare memory in @a a and @a b, where both must be of * the same pointer type. + * + * Do NOT use this function on arrays, it would only compare + * the first element! */ #define GNUNET_memcmp(a, b) \ ({ \ @@ -1099,6 +1102,35 @@ GNUNET_ntoh_double (double d); /** + * Compare memory in @a b1 and @a b2 in constant time, suitable for private + * data. + * + * @param b1 some buffer of size @a len + * @param b2 another buffer of size @a len + * @param len number of bytes in @a b1 and @a b2 + * @return 0 if buffers are equal, + */ +int +GNUNET_memcmp_ct_ (const void *b1, + const void *b2, + size_t len); + +/** + * Compare memory in @a a and @a b in constant time, suitable for private + * data. Both @a a and @a b must be of the same pointer type. + * + * Do NOT use this function on arrays, it would only compare + * the first element! + */ +#define GNUNET_memcmp_priv(a, b) \ + ({ \ + const typeof (*b) * _a = (a); \ + const typeof (*a) * _b = (b); \ + GNUNET_memcmp_ct_ (_a, _b, sizeof(*a)); \ + }) + + +/** * Check that memory in @a a is all zeros. @a a must be a pointer. * * @param a pointer to @a n bytes which should be tested for the |