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/*
* gnome-keyring
*
* Copyright (C) 2008 Stefan Walter
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, see
* <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "gkm-crypto.h"
#include "gkm-dsa-mechanism.h"
#include "gkm-session.h"
#include "gkm-sexp.h"
#include "gkm-sexp-key.h"
#include "egg/egg-libgcrypt.h"
#include "egg/egg-secure-memory.h"
/* ----------------------------------------------------------------------------
* PUBLIC
*/
CK_RV
gkm_dsa_mechanism_sign (gcry_sexp_t sexp, CK_BYTE_PTR data, CK_ULONG n_data,
CK_BYTE_PTR signature, CK_ULONG_PTR n_signature)
{
gcry_sexp_t ssig, splain;
gcry_error_t gcry;
gcry_mpi_t mpi;
CK_ULONG size;
CK_RV rv;
g_return_val_if_fail (sexp, CKR_GENERAL_ERROR);
g_return_val_if_fail (n_signature, CKR_ARGUMENTS_BAD);
g_return_val_if_fail (data, CKR_ARGUMENTS_BAD);
if (n_data != 20)
return CKR_DATA_LEN_RANGE;
/* If no output, then don't process */
if (!signature) {
*n_signature = 40;
return CKR_OK;
} else if (*n_signature < 40) {
*n_signature = 40;
return CKR_BUFFER_TOO_SMALL;
}
/* Prepare the input s-expression */
gcry = gcry_mpi_scan (&mpi, GCRYMPI_FMT_USG, data, n_data, NULL);
g_return_val_if_fail (gcry == 0, CKR_GENERAL_ERROR);
gcry = gcry_sexp_build (&splain, NULL, "(data (flags raw) (value %m))", mpi);
gcry_mpi_release (mpi);
g_return_val_if_fail (gcry == 0, CKR_GENERAL_ERROR);
/* Do the magic */
gcry = gcry_pk_sign (&ssig, splain, sexp);
gcry_sexp_release (splain);
/* TODO: Certain codes should be returned (data too big etc... ) */
if (gcry) {
g_message ("signing of the data failed: %s", gcry_strerror (gcry));
return CKR_FUNCTION_FAILED;
}
g_assert (*n_signature >= 40);
size = 20;
rv = gkm_crypto_sexp_to_data (ssig, 20 * 8, signature, &size, NULL, "dsa", "r", NULL);
if (rv == CKR_OK) {
g_return_val_if_fail (size == 20, CKR_GENERAL_ERROR);
rv = gkm_crypto_sexp_to_data (ssig, 20 * 8, signature + 20, &size, NULL, "dsa", "s", NULL);
if (rv == CKR_OK) {
g_return_val_if_fail (size == 20, CKR_GENERAL_ERROR);
*n_signature = 40;
}
}
gcry_sexp_release (ssig);
return CKR_OK;
}
CK_RV
gkm_dsa_mechanism_verify (gcry_sexp_t sexp, CK_BYTE_PTR data, CK_ULONG n_data,
CK_BYTE_PTR signature, CK_ULONG n_signature)
{
gcry_sexp_t ssig, splain;
gcry_error_t gcry;
gcry_mpi_t mpi, mpi2;
g_return_val_if_fail (sexp, CKR_GENERAL_ERROR);
g_return_val_if_fail (signature, CKR_ARGUMENTS_BAD);
g_return_val_if_fail (data, CKR_ARGUMENTS_BAD);
if (n_data != 20)
return CKR_DATA_LEN_RANGE;
if (n_signature != 40)
return CKR_SIGNATURE_LEN_RANGE;
/* Prepare the input s-expressions */
gcry = gcry_mpi_scan (&mpi, GCRYMPI_FMT_USG, data, n_data, NULL);
g_return_val_if_fail (gcry == 0, CKR_GENERAL_ERROR);
gcry = gcry_sexp_build (&splain, NULL, "(data (flags raw) (value %m))", mpi);
gcry_mpi_release (mpi);
g_return_val_if_fail (gcry == 0, CKR_GENERAL_ERROR);
gcry = gcry_mpi_scan (&mpi, GCRYMPI_FMT_USG, signature, 20, NULL);
g_return_val_if_fail (gcry == 0, CKR_GENERAL_ERROR);
gcry = gcry_mpi_scan (&mpi2, GCRYMPI_FMT_USG, signature + 20, 20, NULL);
g_return_val_if_fail (gcry == 0, CKR_GENERAL_ERROR);
gcry = gcry_sexp_build (&ssig, NULL, "(sig-val (dsa (r %m) (s %m)))", mpi, mpi2);
gcry_mpi_release (mpi);
gcry_mpi_release (mpi2);
g_return_val_if_fail (gcry == 0, CKR_GENERAL_ERROR);
/* Do the magic */
gcry = gcry_pk_verify (ssig, splain, sexp);
gcry_sexp_release (splain);
gcry_sexp_release (ssig);
/* TODO: See if any other codes should be mapped */
if (gcry_err_code (gcry) == GPG_ERR_BAD_SIGNATURE) {
return CKR_SIGNATURE_INVALID;
} else if (gcry) {
g_message ("verifying of the data failed: %s", gcry_strerror (gcry));
return CKR_FUNCTION_FAILED;
}
return CKR_OK;
}
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