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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-rsa-mechanism.h"
#include "gkm-sexp.h"
#include "egg/egg-libgcrypt.h"
#include "egg/egg-secure-memory.h"
/* ----------------------------------------------------------------------------
* PUBLIC
*/
CK_RV
gkm_rsa_mechanism_encrypt (gcry_sexp_t sexp, EggPadding padding, CK_BYTE_PTR data,
CK_ULONG n_data, CK_BYTE_PTR encrypted, CK_ULONG_PTR n_encrypted)
{
gcry_sexp_t splain, sdata;
gcry_error_t gcry;
guint nbits;
CK_RV rv;
g_return_val_if_fail (sexp, CKR_GENERAL_ERROR);
g_return_val_if_fail (n_encrypted, CKR_ARGUMENTS_BAD);
g_return_val_if_fail (data, CKR_ARGUMENTS_BAD);
nbits = gcry_pk_get_nbits (sexp);
g_return_val_if_fail (nbits > 0, CKR_GENERAL_ERROR);
/* Just want to know the length */
if (!encrypted) {
*n_encrypted = (nbits + 7) / 8;
return CKR_OK;
}
/* Prepare the input s expression */
rv = gkm_crypto_data_to_sexp ("(data (flags raw) (value %m))",
nbits, padding, data, n_data, &splain);
if (rv != CKR_OK)
return rv;
/* Do the magic */
gcry = gcry_pk_encrypt (&sdata, splain, sexp);
gcry_sexp_release (splain);
/* TODO: Certain codes should be returned (data too big etc... ) */
if (gcry) {
g_message ("encrypting of the data failed: %s", gcry_strerror (gcry));
return CKR_FUNCTION_FAILED;
}
/* Now extract and send it back out */
rv = gkm_crypto_sexp_to_data (sdata, nbits, encrypted, n_encrypted, NULL,
"enc-val", "rsa", "a", NULL);
gcry_sexp_release (sdata);
return rv;
}
CK_RV
gkm_rsa_mechanism_decrypt (gcry_sexp_t sexp, EggPadding padding, CK_BYTE_PTR encrypted,
CK_ULONG n_encrypted, CK_BYTE_PTR data, CK_ULONG_PTR n_data)
{
gcry_sexp_t splain, sdata;
gcry_error_t gcry;
guint nbits;
CK_RV rv;
g_return_val_if_fail (sexp, CKR_GENERAL_ERROR);
g_return_val_if_fail (n_data, CKR_ARGUMENTS_BAD);
g_return_val_if_fail (encrypted, CKR_ARGUMENTS_BAD);
nbits = gcry_pk_get_nbits (sexp);
g_return_val_if_fail (nbits > 0, CKR_GENERAL_ERROR);
/* Just want to know the length */
if (!data) {
*n_data = (nbits + 7) / 8;
return CKR_OK;
}
if (n_encrypted != (nbits + 7) / 8)
return CKR_DATA_LEN_RANGE;
/* Prepare the input s expression */
rv = gkm_crypto_data_to_sexp ("(enc-val (flags) (rsa (a %m)))",
nbits, NULL, encrypted, n_encrypted, &sdata);
if (rv != CKR_OK)
return rv;
/* Do the magic */
gcry = gcry_pk_decrypt (&splain, sdata, sexp);
gcry_sexp_release (sdata);
/* TODO: Certain codes should be returned (data too big etc... ) */
if (gcry) {
g_message ("decrypting of the data failed: %s", gcry_strerror (gcry));
return CKR_FUNCTION_FAILED;
}
/* Now extract and send it back out */
rv = gkm_crypto_sexp_to_data (splain, nbits, data, n_data, padding, "value", NULL);
gcry_sexp_release (splain);
return rv;
}
CK_RV
gkm_rsa_mechanism_sign (gcry_sexp_t sexp, EggPadding padding, CK_BYTE_PTR data,
CK_ULONG n_data, CK_BYTE_PTR signature, CK_ULONG_PTR n_signature)
{
gcry_sexp_t ssig, sdata;
guint nbits;
gcry_error_t gcry;
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);
nbits = gcry_pk_get_nbits (sexp);
g_return_val_if_fail (nbits > 0, CKR_GENERAL_ERROR);
/* Just want to know the length */
if (!signature) {
*n_signature = (nbits + 7) / 8;
return CKR_OK;
}
/* Prepare the input sexp */
rv = gkm_crypto_data_to_sexp ("(data (flags raw) (value %m))",
nbits, padding, data, n_data, &sdata);
if (rv != CKR_OK)
return rv;
/* Do the magic */
gcry = gcry_pk_sign (&ssig, sdata, sexp);
gcry_sexp_release (sdata);
/* 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;
}
/* Now extract and send it back out */
rv = gkm_crypto_sexp_to_data (ssig, nbits, signature, n_signature, NULL, "rsa", "s", NULL);
gcry_sexp_release (ssig);
return rv;
}
CK_RV
gkm_rsa_mechanism_verify (gcry_sexp_t sexp, EggPadding padding, CK_BYTE_PTR data,
CK_ULONG n_data, CK_BYTE_PTR signature, CK_ULONG n_signature)
{
gcry_sexp_t ssig, sdata;
gcry_error_t gcry;
guint nbits;
CK_RV rv;
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);
/* The key size */
nbits = gcry_pk_get_nbits (sexp);
g_return_val_if_fail (nbits > 0, CKR_GENERAL_ERROR);
if (n_signature != (nbits + 7) / 8)
return CKR_SIGNATURE_LEN_RANGE;
/* Prepare the input s expressions */
rv = gkm_crypto_data_to_sexp ("(data (flags raw) (value %m))",
nbits, padding, data, n_data, &sdata);
if (rv != CKR_OK)
return rv;
rv = gkm_crypto_data_to_sexp ("(sig-val (rsa (s %m)))",
nbits, NULL, signature, n_signature, &ssig);
if (rv != CKR_OK) {
gcry_sexp_release (sdata);
return rv;
}
/* Do the magic */
gcry = gcry_pk_verify (ssig, sdata, sexp);
gcry_sexp_release (sdata);
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 ("signing of the data failed: %s", gcry_strerror (gcry));
return CKR_FUNCTION_FAILED;
}
return CKR_OK;
}
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