From 5ff4c5af715d098852d124de116d354ee10f4ea4 Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Mon, 11 Feb 2019 16:22:00 +0100 Subject: Split most .c files into one per function and flatten file hierarchy MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- libkeccak_generalised_sum_fd.c | 49 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 libkeccak_generalised_sum_fd.c (limited to 'libkeccak_generalised_sum_fd.c') diff --git a/libkeccak_generalised_sum_fd.c b/libkeccak_generalised_sum_fd.c new file mode 100644 index 0000000..133ffa9 --- /dev/null +++ b/libkeccak_generalised_sum_fd.c @@ -0,0 +1,49 @@ +/* See LICENSE file for copyright and license details. */ +#include "common.h" + + +/** + * Calculate a Keccak-family hashsum of a file, + * the content of the file is assumed non-sensitive + * + * @param fd The file descriptor of the file to hash + * @param state The hashing state, should not be initialised (memory leak otherwise) + * @param spec Specifications for the hashing algorithm + * @param suffix The data suffix, see `libkeccak_digest` + * @param hashsum Output array for the hashsum, have an allocation size of + * at least `((spec->output + 7) / 8) * sizeof(char)`, may be `NULL` + * @return Zero on success, -1 on error + */ +int +libkeccak_generalised_sum_fd(int fd, libkeccak_state_t *restrict state, const libkeccak_spec_t *restrict spec, + const char *restrict suffix, void *restrict hashsum) +{ + ssize_t got; + struct stat attr; + size_t blksize = 4096; + char *restrict chunk; + + if (libkeccak_state_initialise(state, spec) < 0) + return -1; + + if (fstat(fd, &attr) == 0) + if (attr.st_blksize > 0) + blksize = (size_t)(attr.st_blksize); + + chunk = alloca(blksize); + + for (;;) { + got = read(fd, chunk, blksize); + if (got < 0) { + if (errno == EINTR) + continue; + return -1; + } + if (got == 0) + break; + if (libkeccak_fast_update(state, chunk, (size_t)got) < 0) + return -1; + } + + return libkeccak_fast_digest(state, NULL, 0, 0, suffix, hashsum); +} -- cgit v1.2.3-70-g09d2