From 1f2e8b5b87df91a0b8ff76fab75538dfcc2478f5 Mon Sep 17 00:00:00 2001 From: Nick Alcock Date: Fri, 5 Jun 2020 21:10:37 +0100 Subject: libctf: add SHA-1 support for libctf This very thin abstraction layer provides SHA-1ing facilities to all of libctf, almost all inlined wrappers around the libiberty functionality other than ctf_sha1_fini. The deduplicator will use this to recursively hash types to prove their identity. libctf/ * ctf-sha1.h: New, inline wrappers around sha1_init_ctx and sha1_process_bytes. * ctf-impl.h: Include it. (ctf_sha1_init): New. (ctf_sha1_add): Likewise. (ctf_sha1_fini): Likewise. * ctf-sha1.c: New, non-inline wrapper around sha1_finish_ctx producing strings. * Makefile.am: Add file. * Makefile.in: Regenerate. --- libctf/ctf-sha1.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 libctf/ctf-sha1.c (limited to 'libctf/ctf-sha1.c') diff --git a/libctf/ctf-sha1.c b/libctf/ctf-sha1.c new file mode 100644 index 0000000..47e6655 --- /dev/null +++ b/libctf/ctf-sha1.c @@ -0,0 +1,50 @@ +/* SHA-1 thunks. + Copyright (C) 2019 Free Software Foundation, Inc. + + This file is part of libctf. + + libctf is free software; you can redistribute it and/or modify it under + the terms of the GNU General Public License as published by the Free + Software Foundation; either version 3, or (at your option) any later + version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; see the file COPYING. If not see + . */ + +#include +#include + +static const char hex[] = "0123456789abcdef"; + +char * +ctf_sha1_fini (ctf_sha1_t *sha1, char *buf) +{ + size_t i; + + /* Alignment suitable for a uint32_t. */ + union + { + uint32_t align; + unsigned char digest[((CTF_SHA1_SIZE - 1) / 2) + 1]; + } align; + + sha1_finish_ctx (sha1, align.digest); + + if (!buf) + return NULL; + + buf[CTF_SHA1_SIZE - 1] = '\0'; + + for (i = 0; i < (CTF_SHA1_SIZE - 1) / 2; i++) + { + buf[2 * i] = hex[align.digest[i] >> 4]; + buf[2 * i + 1] = hex[align.digest[i] & 0xf]; + } + return buf; +} -- cgit v1.1