diff options
Diffstat (limited to 'libar2.h')
| -rw-r--r-- | libar2.h | 23 |
1 files changed, 21 insertions, 2 deletions
@@ -14,8 +14,10 @@ #if defined(__GNUC__) # define LIBAR2_NONNULL__(...) __attribute__((nonnull(__VA_ARGS__))) +# define LIBAR2_PURE__ __attribute__((pure)) #else # define LIBAR2_NONNULL__(...) +# define LIBAR2_PURE__ #endif #ifndef LIBAR2_PUBLIC__ @@ -644,8 +646,8 @@ void libar2_erase(volatile void *mem, size_t size); * have erased data configured in `ctx` to be automatically * erased * - * @param hash Binary hash ("tag") output buffer, shall - * be at least `params->hashlen` bytes large + * @param hash Binary hash ("tag") output buffer, shall be at + * least `libar2_hash_buf_size(params)` bytes large * @param msg Message (password) to hash; only modified if * `ctx->autoerase_message` is non-zero * @param msglen The length of `msg`; at least 0, at most 2³²−1 @@ -656,6 +658,23 @@ void libar2_erase(volatile void *mem, size_t size); LIBAR2_PUBLIC__ LIBAR2_NONNULL__(1, 4, 5) int libar2_hash(void *hash, void *msg, size_t msglen, struct libar2_argon2_parameters *params, struct libar2_context *ctx); +/** + * Return the number of bytes that is required for + * the first parameter, the output parmeter, of + * `libar2_hash` + * + * If `params->hashlen <= 64`, this function will + * return `params->hashlen` as is, otherwise it + * will return a value that is no greater than + * `params->hashlen + 127` + * + * @param params Hashing parameters + * @return The required allocation size of the + * output parameter of `libar2_hash` + */ +LIBAR2_PUBLIC__ LIBAR2_NONNULL__(1) LIBAR2_PURE__ +size_t libar2_hash_buf_size(struct libar2_argon2_parameters *params); + #if defined(__clang__) # pragma clang diagnostic pop #endif |