596 lines
19 KiB
C++
596 lines
19 KiB
C++
/*
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* QEMU Crypto akcipher algorithms
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*
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* Copyright (c) 2022 Bytedance
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* Author: lei he <helei.sig11@bytedance.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <gcrypt.h>
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#include "qemu/osdep.h"
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#include "qemu/host-utils.h"
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#include "crypto/akcipher.h"
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#include "crypto/random.h"
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#include "qapi/error.h"
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#include "sysemu/cryptodev.h"
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#include "rsakey.h"
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typedef struct QCryptoGcryptRSA {
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QCryptoAkCipher akcipher;
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gcry_sexp_t key;
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QCryptoRSAPaddingAlgorithm padding_alg;
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QCryptoHashAlgorithm hash_alg;
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} QCryptoGcryptRSA;
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static void qcrypto_gcrypt_rsa_free(QCryptoAkCipher *akcipher)
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{
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QCryptoGcryptRSA *rsa = (QCryptoGcryptRSA *)akcipher;
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if (!rsa) {
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return;
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}
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gcry_sexp_release(rsa->key);
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g_free(rsa);
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}
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static QCryptoGcryptRSA *qcrypto_gcrypt_rsa_new(
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const QCryptoAkCipherOptionsRSA *opt,
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QCryptoAkCipherKeyType type,
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const uint8_t *key, size_t keylen,
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Error **errp);
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QCryptoAkCipher *qcrypto_akcipher_new(const QCryptoAkCipherOptions *opts,
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QCryptoAkCipherKeyType type,
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const uint8_t *key, size_t keylen,
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Error **errp)
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{
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switch (opts->alg) {
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case QCRYPTO_AKCIPHER_ALG_RSA:
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return (QCryptoAkCipher *)qcrypto_gcrypt_rsa_new(
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&opts->u.rsa, type, key, keylen, errp);
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default:
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error_setg(errp, "Unsupported algorithm: %u", opts->alg);
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return NULL;
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}
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return NULL;
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}
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static void qcrypto_gcrypt_set_rsa_size(QCryptoAkCipher *akcipher, gcry_mpi_t n)
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{
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size_t key_size = (gcry_mpi_get_nbits(n) + 7) / 8;
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akcipher->max_plaintext_len = key_size;
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akcipher->max_ciphertext_len = key_size;
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akcipher->max_dgst_len = key_size;
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akcipher->max_signature_len = key_size;
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}
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static int qcrypto_gcrypt_parse_rsa_private_key(
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QCryptoGcryptRSA *rsa,
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const uint8_t *key, size_t keylen, Error **errp)
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{
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g_autoptr(QCryptoAkCipherRSAKey) rsa_key = qcrypto_akcipher_rsakey_parse(
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QCRYPTO_AKCIPHER_KEY_TYPE_PRIVATE, key, keylen, errp);
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gcry_mpi_t n = NULL, e = NULL, d = NULL, p = NULL, q = NULL, u = NULL;
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bool compute_mul_inv = false;
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int ret = -1;
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gcry_error_t err;
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if (!rsa_key) {
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return ret;
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}
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err = gcry_mpi_scan(&n, GCRYMPI_FMT_STD,
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rsa_key->n.data, rsa_key->n.len, NULL);
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if (gcry_err_code(err) != 0) {
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error_setg(errp, "Failed to parse RSA parameter n: %s/%s",
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gcry_strsource(err), gcry_strerror(err));
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goto cleanup;
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}
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err = gcry_mpi_scan(&e, GCRYMPI_FMT_STD,
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rsa_key->e.data, rsa_key->e.len, NULL);
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if (gcry_err_code(err) != 0) {
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error_setg(errp, "Failed to parse RSA parameter e: %s/%s",
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gcry_strsource(err), gcry_strerror(err));
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goto cleanup;
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}
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err = gcry_mpi_scan(&d, GCRYMPI_FMT_STD,
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rsa_key->d.data, rsa_key->d.len, NULL);
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if (gcry_err_code(err) != 0) {
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error_setg(errp, "Failed to parse RSA parameter d: %s/%s",
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gcry_strsource(err), gcry_strerror(err));
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goto cleanup;
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}
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err = gcry_mpi_scan(&p, GCRYMPI_FMT_STD,
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rsa_key->p.data, rsa_key->p.len, NULL);
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if (gcry_err_code(err) != 0) {
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error_setg(errp, "Failed to parse RSA parameter p: %s/%s",
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gcry_strsource(err), gcry_strerror(err));
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goto cleanup;
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}
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err = gcry_mpi_scan(&q, GCRYMPI_FMT_STD,
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rsa_key->q.data, rsa_key->q.len, NULL);
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if (gcry_err_code(err) != 0) {
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error_setg(errp, "Failed to parse RSA parameter q: %s/%s",
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gcry_strsource(err), gcry_strerror(err));
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goto cleanup;
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}
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if (gcry_mpi_cmp_ui(p, 0) > 0 && gcry_mpi_cmp_ui(q, 0) > 0) {
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compute_mul_inv = true;
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u = gcry_mpi_new(0);
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if (gcry_mpi_cmp(p, q) > 0) {
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gcry_mpi_swap(p, q);
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}
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gcry_mpi_invm(u, p, q);
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}
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if (compute_mul_inv) {
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err = gcry_sexp_build(&rsa->key, NULL,
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"(private-key (rsa (n %m) (e %m) (d %m) (p %m) (q %m) (u %m)))",
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n, e, d, p, q, u);
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} else {
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err = gcry_sexp_build(&rsa->key, NULL,
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"(private-key (rsa (n %m) (e %m) (d %m)))", n, e, d);
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}
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if (gcry_err_code(err) != 0) {
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error_setg(errp, "Failed to build RSA private key: %s/%s",
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gcry_strsource(err), gcry_strerror(err));
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goto cleanup;
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}
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qcrypto_gcrypt_set_rsa_size((QCryptoAkCipher *)rsa, n);
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ret = 0;
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cleanup:
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gcry_mpi_release(n);
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gcry_mpi_release(e);
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gcry_mpi_release(d);
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gcry_mpi_release(p);
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gcry_mpi_release(q);
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gcry_mpi_release(u);
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return ret;
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}
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static int qcrypto_gcrypt_parse_rsa_public_key(QCryptoGcryptRSA *rsa,
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const uint8_t *key,
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size_t keylen,
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Error **errp)
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{
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g_autoptr(QCryptoAkCipherRSAKey) rsa_key = qcrypto_akcipher_rsakey_parse(
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QCRYPTO_AKCIPHER_KEY_TYPE_PUBLIC, key, keylen, errp);
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gcry_mpi_t n = NULL, e = NULL;
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int ret = -1;
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gcry_error_t err;
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if (!rsa_key) {
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return ret;
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}
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err = gcry_mpi_scan(&n, GCRYMPI_FMT_STD,
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rsa_key->n.data, rsa_key->n.len, NULL);
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if (gcry_err_code(err) != 0) {
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error_setg(errp, "Failed to parse RSA parameter n: %s/%s",
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gcry_strsource(err), gcry_strerror(err));
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goto cleanup;
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}
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err = gcry_mpi_scan(&e, GCRYMPI_FMT_STD,
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rsa_key->e.data, rsa_key->e.len, NULL);
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if (gcry_err_code(err) != 0) {
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error_setg(errp, "Failed to parse RSA parameter e: %s/%s",
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gcry_strsource(err), gcry_strerror(err));
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goto cleanup;
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}
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err = gcry_sexp_build(&rsa->key, NULL,
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"(public-key (rsa (n %m) (e %m)))", n, e);
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if (gcry_err_code(err) != 0) {
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error_setg(errp, "Failed to build RSA public key: %s/%s",
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gcry_strsource(err), gcry_strerror(err));
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goto cleanup;
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}
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qcrypto_gcrypt_set_rsa_size((QCryptoAkCipher *)rsa, n);
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ret = 0;
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cleanup:
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gcry_mpi_release(n);
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gcry_mpi_release(e);
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return ret;
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}
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static int qcrypto_gcrypt_rsa_encrypt(QCryptoAkCipher *akcipher,
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const void *in, size_t in_len,
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void *out, size_t out_len,
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Error **errp)
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{
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QCryptoGcryptRSA *rsa = (QCryptoGcryptRSA *)akcipher;
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int ret = -1;
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gcry_sexp_t data_sexp = NULL, cipher_sexp = NULL;
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gcry_sexp_t cipher_sexp_item = NULL;
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gcry_mpi_t cipher_mpi = NULL;
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const char *result;
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gcry_error_t err;
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size_t actual_len;
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if (in_len > akcipher->max_plaintext_len) {
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error_setg(errp, "Plaintext length is greater than key size: %d",
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akcipher->max_plaintext_len);
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return ret;
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}
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err = gcry_sexp_build(&data_sexp, NULL,
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"(data (flags %s) (value %b))",
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QCryptoRSAPaddingAlgorithm_str(rsa->padding_alg),
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in_len, in);
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if (gcry_err_code(err) != 0) {
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error_setg(errp, "Failed to build plaintext: %s/%s",
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gcry_strsource(err), gcry_strerror(err));
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goto cleanup;
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}
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err = gcry_pk_encrypt(&cipher_sexp, data_sexp, rsa->key);
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if (gcry_err_code(err) != 0) {
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error_setg(errp, "Failed to encrypt: %s/%s",
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gcry_strsource(err), gcry_strerror(err));
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goto cleanup;
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}
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/* S-expression of cipher: (enc-val (rsa (a a-mpi))) */
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cipher_sexp_item = gcry_sexp_find_token(cipher_sexp, "a", 0);
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if (!cipher_sexp_item || gcry_sexp_length(cipher_sexp_item) != 2) {
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error_setg(errp, "Invalid ciphertext result");
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goto cleanup;
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}
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if (rsa->padding_alg == QCRYPTO_RSA_PADDING_ALG_RAW) {
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cipher_mpi = gcry_sexp_nth_mpi(cipher_sexp_item, 1, GCRYMPI_FMT_USG);
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if (!cipher_mpi) {
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error_setg(errp, "Invalid ciphertext result");
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goto cleanup;
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}
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err = gcry_mpi_print(GCRYMPI_FMT_USG, out, out_len,
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&actual_len, cipher_mpi);
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if (gcry_err_code(err) != 0) {
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error_setg(errp, "Failed to print MPI: %s/%s",
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gcry_strsource(err), gcry_strerror(err));
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goto cleanup;
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}
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if (actual_len > out_len) {
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error_setg(errp, "Ciphertext buffer length is too small");
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goto cleanup;
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}
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/* We always padding leading-zeros for RSA-RAW */
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if (actual_len < out_len) {
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memmove((uint8_t *)out + (out_len - actual_len), out, actual_len);
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memset(out, 0, out_len - actual_len);
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}
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ret = out_len;
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} else {
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result = gcry_sexp_nth_data(cipher_sexp_item, 1, &actual_len);
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if (!result) {
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error_setg(errp, "Invalid ciphertext result");
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goto cleanup;
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}
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if (actual_len > out_len) {
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error_setg(errp, "Ciphertext buffer length is too small");
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goto cleanup;
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}
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memcpy(out, result, actual_len);
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ret = actual_len;
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}
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cleanup:
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gcry_sexp_release(data_sexp);
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gcry_sexp_release(cipher_sexp);
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gcry_sexp_release(cipher_sexp_item);
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gcry_mpi_release(cipher_mpi);
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return ret;
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}
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static int qcrypto_gcrypt_rsa_decrypt(QCryptoAkCipher *akcipher,
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const void *in, size_t in_len,
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void *out, size_t out_len,
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Error **errp)
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{
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QCryptoGcryptRSA *rsa = (QCryptoGcryptRSA *)akcipher;
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int ret = -1;
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gcry_sexp_t data_sexp = NULL, cipher_sexp = NULL;
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gcry_mpi_t data_mpi = NULL;
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gcry_error_t err;
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size_t actual_len;
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const char *result;
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if (in_len > akcipher->max_ciphertext_len) {
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error_setg(errp, "Ciphertext length is greater than key size: %d",
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akcipher->max_ciphertext_len);
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return ret;
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}
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err = gcry_sexp_build(&cipher_sexp, NULL,
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"(enc-val (flags %s) (rsa (a %b) ))",
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QCryptoRSAPaddingAlgorithm_str(rsa->padding_alg),
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in_len, in);
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if (gcry_err_code(err) != 0) {
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error_setg(errp, "Failed to build ciphertext: %s/%s",
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gcry_strsource(err), gcry_strerror(err));
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goto cleanup;
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}
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err = gcry_pk_decrypt(&data_sexp, cipher_sexp, rsa->key);
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if (gcry_err_code(err) != 0) {
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error_setg(errp, "Failed to decrypt: %s/%s",
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gcry_strsource(err), gcry_strerror(err));
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goto cleanup;
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}
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/* S-expression of plaintext: (value plaintext) */
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if (rsa->padding_alg == QCRYPTO_RSA_PADDING_ALG_RAW) {
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data_mpi = gcry_sexp_nth_mpi(data_sexp, 1, GCRYMPI_FMT_USG);
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if (!data_mpi) {
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error_setg(errp, "Invalid plaintext result");
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goto cleanup;
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}
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err = gcry_mpi_print(GCRYMPI_FMT_USG, out, out_len,
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&actual_len, data_mpi);
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if (gcry_err_code(err) != 0) {
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error_setg(errp, "Failed to print MPI: %s/%s",
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gcry_strsource(err), gcry_strerror(err));
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goto cleanup;
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}
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if (actual_len > out_len) {
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error_setg(errp, "Plaintext buffer length is too small");
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goto cleanup;
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}
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/* We always padding leading-zeros for RSA-RAW */
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if (actual_len < out_len) {
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memmove((uint8_t *)out + (out_len - actual_len), out, actual_len);
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memset(out, 0, out_len - actual_len);
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}
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ret = out_len;
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} else {
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result = gcry_sexp_nth_data(data_sexp, 1, &actual_len);
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if (!result) {
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error_setg(errp, "Invalid plaintext result");
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goto cleanup;
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}
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if (actual_len > out_len) {
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error_setg(errp, "Plaintext buffer length is too small");
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goto cleanup;
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}
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memcpy(out, result, actual_len);
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ret = actual_len;
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}
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cleanup:
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gcry_sexp_release(cipher_sexp);
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gcry_sexp_release(data_sexp);
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gcry_mpi_release(data_mpi);
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return ret;
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}
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static int qcrypto_gcrypt_rsa_sign(QCryptoAkCipher *akcipher,
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const void *in, size_t in_len,
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void *out, size_t out_len, Error **errp)
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{
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QCryptoGcryptRSA *rsa = (QCryptoGcryptRSA *)akcipher;
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int ret = -1;
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gcry_sexp_t dgst_sexp = NULL, sig_sexp = NULL;
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gcry_sexp_t sig_sexp_item = NULL;
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const char *result;
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gcry_error_t err;
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size_t actual_len;
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if (in_len > akcipher->max_dgst_len) {
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error_setg(errp, "Data length is greater than key size: %d",
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akcipher->max_dgst_len);
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return ret;
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}
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if (rsa->padding_alg != QCRYPTO_RSA_PADDING_ALG_PKCS1) {
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error_setg(errp, "Invalid padding %u", rsa->padding_alg);
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return ret;
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}
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err = gcry_sexp_build(&dgst_sexp, NULL,
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"(data (flags pkcs1) (hash %s %b))",
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QCryptoHashAlgorithm_str(rsa->hash_alg),
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in_len, in);
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if (gcry_err_code(err) != 0) {
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error_setg(errp, "Failed to build dgst: %s/%s",
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gcry_strsource(err), gcry_strerror(err));
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goto cleanup;
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}
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err = gcry_pk_sign(&sig_sexp, dgst_sexp, rsa->key);
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if (gcry_err_code(err) != 0) {
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error_setg(errp, "Failed to make signature: %s/%s",
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gcry_strsource(err), gcry_strerror(err));
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goto cleanup;
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}
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/* S-expression of signature: (sig-val (rsa (s s-mpi))) */
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sig_sexp_item = gcry_sexp_find_token(sig_sexp, "s", 0);
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if (!sig_sexp_item || gcry_sexp_length(sig_sexp_item) != 2) {
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error_setg(errp, "Invalid signature result");
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goto cleanup;
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}
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result = gcry_sexp_nth_data(sig_sexp_item, 1, &actual_len);
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if (!result) {
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error_setg(errp, "Invalid signature result");
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goto cleanup;
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}
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if (actual_len > out_len) {
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error_setg(errp, "Signature buffer length is too small");
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goto cleanup;
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}
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memcpy(out, result, actual_len);
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ret = actual_len;
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cleanup:
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gcry_sexp_release(dgst_sexp);
|
|
gcry_sexp_release(sig_sexp);
|
|
gcry_sexp_release(sig_sexp_item);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int qcrypto_gcrypt_rsa_verify(QCryptoAkCipher *akcipher,
|
|
const void *in, size_t in_len,
|
|
const void *in2, size_t in2_len,
|
|
Error **errp)
|
|
{
|
|
QCryptoGcryptRSA *rsa = (QCryptoGcryptRSA *)akcipher;
|
|
int ret = -1;
|
|
gcry_sexp_t sig_sexp = NULL, dgst_sexp = NULL;
|
|
gcry_error_t err;
|
|
|
|
if (in_len > akcipher->max_signature_len) {
|
|
error_setg(errp, "Signature length is greater than key size: %d",
|
|
akcipher->max_signature_len);
|
|
return ret;
|
|
}
|
|
|
|
if (in2_len > akcipher->max_dgst_len) {
|
|
error_setg(errp, "Data length is greater than key size: %d",
|
|
akcipher->max_dgst_len);
|
|
return ret;
|
|
}
|
|
|
|
if (rsa->padding_alg != QCRYPTO_RSA_PADDING_ALG_PKCS1) {
|
|
error_setg(errp, "Invalid padding %u", rsa->padding_alg);
|
|
return ret;
|
|
}
|
|
|
|
err = gcry_sexp_build(&sig_sexp, NULL,
|
|
"(sig-val (rsa (s %b)))", in_len, in);
|
|
if (gcry_err_code(err) != 0) {
|
|
error_setg(errp, "Failed to build signature: %s/%s",
|
|
gcry_strsource(err), gcry_strerror(err));
|
|
goto cleanup;
|
|
}
|
|
|
|
err = gcry_sexp_build(&dgst_sexp, NULL,
|
|
"(data (flags pkcs1) (hash %s %b))",
|
|
QCryptoHashAlgorithm_str(rsa->hash_alg),
|
|
in2_len, in2);
|
|
if (gcry_err_code(err) != 0) {
|
|
error_setg(errp, "Failed to build dgst: %s/%s",
|
|
gcry_strsource(err), gcry_strerror(err));
|
|
goto cleanup;
|
|
}
|
|
|
|
err = gcry_pk_verify(sig_sexp, dgst_sexp, rsa->key);
|
|
if (gcry_err_code(err) != 0) {
|
|
error_setg(errp, "Failed to verify signature: %s/%s",
|
|
gcry_strsource(err), gcry_strerror(err));
|
|
goto cleanup;
|
|
}
|
|
ret = 0;
|
|
|
|
cleanup:
|
|
gcry_sexp_release(dgst_sexp);
|
|
gcry_sexp_release(sig_sexp);
|
|
|
|
return ret;
|
|
}
|
|
|
|
QCryptoAkCipherDriver gcrypt_rsa = {
|
|
.encrypt = qcrypto_gcrypt_rsa_encrypt,
|
|
.decrypt = qcrypto_gcrypt_rsa_decrypt,
|
|
.sign = qcrypto_gcrypt_rsa_sign,
|
|
.verify = qcrypto_gcrypt_rsa_verify,
|
|
.free = qcrypto_gcrypt_rsa_free,
|
|
};
|
|
|
|
static QCryptoGcryptRSA *qcrypto_gcrypt_rsa_new(
|
|
const QCryptoAkCipherOptionsRSA *opt,
|
|
QCryptoAkCipherKeyType type,
|
|
const uint8_t *key, size_t keylen,
|
|
Error **errp)
|
|
{
|
|
QCryptoGcryptRSA *rsa = g_new0(QCryptoGcryptRSA, 1);
|
|
rsa->padding_alg = opt->padding_alg;
|
|
rsa->hash_alg = opt->hash_alg;
|
|
rsa->akcipher.driver = &gcrypt_rsa;
|
|
|
|
switch (type) {
|
|
case QCRYPTO_AKCIPHER_KEY_TYPE_PRIVATE:
|
|
if (qcrypto_gcrypt_parse_rsa_private_key(rsa, key, keylen, errp) != 0) {
|
|
goto error;
|
|
}
|
|
break;
|
|
|
|
case QCRYPTO_AKCIPHER_KEY_TYPE_PUBLIC:
|
|
if (qcrypto_gcrypt_parse_rsa_public_key(rsa, key, keylen, errp) != 0) {
|
|
goto error;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
error_setg(errp, "Unknown akcipher key type %d", type);
|
|
goto error;
|
|
}
|
|
|
|
return rsa;
|
|
|
|
error:
|
|
qcrypto_gcrypt_rsa_free((QCryptoAkCipher *)rsa);
|
|
return NULL;
|
|
}
|
|
|
|
|
|
bool qcrypto_akcipher_supports(QCryptoAkCipherOptions *opts)
|
|
{
|
|
switch (opts->alg) {
|
|
case QCRYPTO_AKCIPHER_ALG_RSA:
|
|
switch (opts->u.rsa.padding_alg) {
|
|
case QCRYPTO_RSA_PADDING_ALG_RAW:
|
|
return true;
|
|
|
|
case QCRYPTO_RSA_PADDING_ALG_PKCS1:
|
|
switch (opts->u.rsa.hash_alg) {
|
|
case QCRYPTO_HASH_ALG_MD5:
|
|
case QCRYPTO_HASH_ALG_SHA1:
|
|
case QCRYPTO_HASH_ALG_SHA256:
|
|
case QCRYPTO_HASH_ALG_SHA512:
|
|
return true;
|
|
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
default:
|
|
return true;
|
|
}
|
|
}
|