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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#if HAVE_GCRYPT
#include "gcrypt-util.h"
#include "hexdecoct.h"
static void *gcrypt_dl = NULL;
static DLSYM_FUNCTION(gcry_control);
static DLSYM_FUNCTION(gcry_check_version);
DLSYM_FUNCTION(gcry_md_close);
DLSYM_FUNCTION(gcry_md_copy);
DLSYM_FUNCTION(gcry_md_ctl);
DLSYM_FUNCTION(gcry_md_get_algo_dlen);
DLSYM_FUNCTION(gcry_md_open);
DLSYM_FUNCTION(gcry_md_read);
DLSYM_FUNCTION(gcry_md_reset);
DLSYM_FUNCTION(gcry_md_setkey);
DLSYM_FUNCTION(gcry_md_write);
DLSYM_FUNCTION(gcry_mpi_add);
DLSYM_FUNCTION(gcry_mpi_add_ui);
DLSYM_FUNCTION(gcry_mpi_cmp);
DLSYM_FUNCTION(gcry_mpi_cmp_ui);
DLSYM_FUNCTION(gcry_mpi_get_nbits);
DLSYM_FUNCTION(gcry_mpi_invm);
DLSYM_FUNCTION(gcry_mpi_mod);
DLSYM_FUNCTION(gcry_mpi_mul);
DLSYM_FUNCTION(gcry_mpi_mulm);
DLSYM_FUNCTION(gcry_mpi_new);
DLSYM_FUNCTION(gcry_mpi_powm);
DLSYM_FUNCTION(gcry_mpi_print);
DLSYM_FUNCTION(gcry_mpi_release);
DLSYM_FUNCTION(gcry_mpi_scan);
DLSYM_FUNCTION(gcry_mpi_set_ui);
DLSYM_FUNCTION(gcry_mpi_sub);
DLSYM_FUNCTION(gcry_mpi_subm);
DLSYM_FUNCTION(gcry_mpi_sub_ui);
DLSYM_FUNCTION(gcry_prime_check);
DLSYM_FUNCTION(gcry_randomize);
DLSYM_FUNCTION(gcry_strerror);
static int dlopen_gcrypt(void) {
ELF_NOTE_DLOPEN("gcrypt",
"Support for journald forward-sealing",
ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
"libgcrypt.so.20");
return dlopen_many_sym_or_warn(
&gcrypt_dl,
"libgcrypt.so.20", LOG_DEBUG,
DLSYM_ARG(gcry_control),
DLSYM_ARG(gcry_check_version),
DLSYM_ARG(gcry_md_close),
DLSYM_ARG(gcry_md_copy),
DLSYM_ARG(gcry_md_ctl),
DLSYM_ARG(gcry_md_get_algo_dlen),
DLSYM_ARG(gcry_md_open),
DLSYM_ARG(gcry_md_read),
DLSYM_ARG(gcry_md_reset),
DLSYM_ARG(gcry_md_setkey),
DLSYM_ARG(gcry_md_write),
DLSYM_ARG(gcry_mpi_add),
DLSYM_ARG(gcry_mpi_add_ui),
DLSYM_ARG(gcry_mpi_cmp),
DLSYM_ARG(gcry_mpi_cmp_ui),
DLSYM_ARG(gcry_mpi_get_nbits),
DLSYM_ARG(gcry_mpi_invm),
DLSYM_ARG(gcry_mpi_mod),
DLSYM_ARG(gcry_mpi_mul),
DLSYM_ARG(gcry_mpi_mulm),
DLSYM_ARG(gcry_mpi_new),
DLSYM_ARG(gcry_mpi_powm),
DLSYM_ARG(gcry_mpi_print),
DLSYM_ARG(gcry_mpi_release),
DLSYM_ARG(gcry_mpi_scan),
DLSYM_ARG(gcry_mpi_set_ui),
DLSYM_ARG(gcry_mpi_sub),
DLSYM_ARG(gcry_mpi_subm),
DLSYM_ARG(gcry_mpi_sub_ui),
DLSYM_ARG(gcry_prime_check),
DLSYM_ARG(gcry_randomize),
DLSYM_ARG(gcry_strerror));
}
int initialize_libgcrypt(bool secmem) {
int r;
r = dlopen_gcrypt();
if (r < 0)
return r;
if (sym_gcry_control(GCRYCTL_INITIALIZATION_FINISHED_P))
return 0;
sym_gcry_control(GCRYCTL_SET_PREFERRED_RNG_TYPE, GCRY_RNG_TYPE_SYSTEM);
assert_se(sym_gcry_check_version("1.4.5"));
/* Turn off "secmem". Clients which wish to make use of this
* feature should initialize the library manually */
if (!secmem)
sym_gcry_control(GCRYCTL_DISABLE_SECMEM);
sym_gcry_control(GCRYCTL_INITIALIZATION_FINISHED, 0);
return 0;
}
# if !PREFER_OPENSSL
int string_hashsum(const char *s, size_t len, int md_algorithm, char **out) {
_cleanup_(sym_gcry_md_closep) gcry_md_hd_t md = NULL;
gcry_error_t err;
size_t hash_size;
void *hash;
char *enc;
int r;
r = initialize_libgcrypt(false);
if (r < 0)
return r;
hash_size = sym_gcry_md_get_algo_dlen(md_algorithm);
assert(hash_size > 0);
err = sym_gcry_md_open(&md, md_algorithm, 0);
if (gcry_err_code(err) != GPG_ERR_NO_ERROR || !md)
return -EIO;
sym_gcry_md_write(md, s, len);
hash = sym_gcry_md_read(md, 0);
if (!hash)
return -EIO;
enc = hexmem(hash, hash_size);
if (!enc)
return -ENOMEM;
*out = enc;
return 0;
}
# endif
#endif
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