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author | Mattias Andrée <maandree@operamail.com> | 2015-09-14 09:42:37 +0200 |
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committer | Mattias Andrée <maandree@operamail.com> | 2015-09-14 09:42:37 +0200 |
commit | ab1775193129c6fb32a39d229b959b5b75d31d1b (patch) | |
tree | 4ac32ef6c254d1dc419b9b34a4f2b44b4144a4af /src | |
parent | implement sha2 (diff) | |
download | libsha2-ab1775193129c6fb32a39d229b959b5b75d31d1b.tar.gz libsha2-ab1775193129c6fb32a39d229b959b5b75d31d1b.tar.bz2 libsha2-ab1775193129c6fb32a39d229b959b5b75d31d1b.tar.xz |
add libsha2_sum_fd
Signed-off-by: Mattias Andrée <maandree@operamail.com>
Diffstat (limited to 'src')
-rw-r--r-- | src/libsha2.h | 1 | ||||
-rw-r--r-- | src/libsha2/files.c | 65 | ||||
-rw-r--r-- | src/libsha2/files.h | 40 |
3 files changed, 106 insertions, 0 deletions
diff --git a/src/libsha2.h b/src/libsha2.h index 7fdee6b..d6ebd2b 100644 --- a/src/libsha2.h +++ b/src/libsha2.h @@ -23,6 +23,7 @@ #include "libsha2/digest.h" #include "libsha2/state.h" #include "libsha2/hex.h" +#include "libsha2/files.h" #endif diff --git a/src/libsha2/files.c b/src/libsha2/files.c new file mode 100644 index 0000000..2f4bb72 --- /dev/null +++ b/src/libsha2/files.c @@ -0,0 +1,65 @@ +/** + * libsha2 – SHA-2-family hashing library + * + * Copyright © 2015 Mattias Andrée (maandree@member.fsf.org) + * + * This library is free software: you can redistribute it and/or modify + * it under the terms of the GNU Affero General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this library. If not, see <http://www.gnu.org/licenses/>. + */ +#include "files.h" +#include "digest.h" +#include <stddef.h> +#include <unistd.h> +#include <sys/stat.h> +#include <alloca.h> + + + +/** + * Calculate the checksum for a file, + * the content of the file is assumed non-sensitive + * + * @param fd The file descriptor of the file + * @param algorithm The hashing algorithm + * @param hashsum Output buffer for the hash + * @return Zero on success, -1 on error + */ +int libsha2_sum_fd(int fd, libsha2_algorithm_t algorithm, char* restrict hashsum) +{ + libsha2_state_t state; + ssize_t got; + struct stat attr; + size_t blksize = 4096; + char* restrict chunk; + + if (libsha2_state_initialise(&state, algorithm) < 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) return -1; + if (got == 0) break; + libsha2_update(&state, chunk, (size_t)got); + } + + libsha2_digest(&state, NULL, 0, hashsum); + return 0; +} + diff --git a/src/libsha2/files.h b/src/libsha2/files.h new file mode 100644 index 0000000..2854cd7 --- /dev/null +++ b/src/libsha2/files.h @@ -0,0 +1,40 @@ +/** + * libsha2 – SHA-2-family hashing library + * + * Copyright © 2015 Mattias Andrée (maandree@member.fsf.org) + * + * This library is free software: you can redistribute it and/or modify + * it under the terms of the GNU Affero General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this library. If not, see <http://www.gnu.org/licenses/>. + */ +#ifndef LIBSHA2_FILES_H +#define LIBSHA2_FILES_H 1 + + +#include "state.h" + + +/** + * Calculate the checksum for a file, + * the content of the file is assumed non-sensitive + * + * @param fd The file descriptor of the file + * @param algorithm The hashing algorithm + * @param hashsum Output buffer for the hash + * @return Zero on success, -1 on error + */ +__attribute__((nonnull, leaf)) +int libsha2_sum_fd(int fd, libsha2_algorithm_t algorithm, char* restrict hashsum); + + +#endif + |