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crypto: Implement RSA algorithm by hogweed 

Implement RSA algorithm by hogweed from nettle. Thus QEMU supports
a 'real' RSA backend to handle request from guest side. It's
important to test RSA offload case without OS & hardware requirement.

Signed-off-by: lei he <helei.sig11@bytedance.com>
Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Lei He 2022-05-25 17:01:14 +08:00 committed by Daniel P. Berrangé
parent 99d423f10c
commit 4c5e512ee0
8 changed files with 964 additions and 0 deletions
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451
crypto/akcipher-nettle.c.inc Normal file
View File

@ -0,0 +1,451 @@
/*
* QEMU Crypto akcipher algorithms
*
* Copyright (c) 2022 Bytedance
* Author: lei he <helei.sig11@bytedance.com>
*
* This library 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 library 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 library; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include <nettle/rsa.h>
#include "qemu/osdep.h"
#include "qemu/host-utils.h"
#include "crypto/akcipher.h"
#include "crypto/random.h"
#include "qapi/error.h"
#include "sysemu/cryptodev.h"
#include "rsakey.h"
typedef struct QCryptoNettleRSA {
QCryptoAkCipher akcipher;
struct rsa_public_key pub;
struct rsa_private_key priv;
QCryptoRSAPaddingAlgorithm padding_alg;
QCryptoHashAlgorithm hash_alg;
} QCryptoNettleRSA;
static void qcrypto_nettle_rsa_free(QCryptoAkCipher *akcipher)
{
QCryptoNettleRSA *rsa = (QCryptoNettleRSA *)akcipher;
if (!rsa) {
return;
}
rsa_public_key_clear(&rsa->pub);
rsa_private_key_clear(&rsa->priv);
g_free(rsa);
}
static QCryptoAkCipher *qcrypto_nettle_rsa_new(
const QCryptoAkCipherOptionsRSA *opt,
QCryptoAkCipherKeyType type,
const uint8_t *key, size_t keylen,
Error **errp);
QCryptoAkCipher *qcrypto_akcipher_new(const QCryptoAkCipherOptions *opts,
QCryptoAkCipherKeyType type,
const uint8_t *key, size_t keylen,
Error **errp)
{
switch (opts->alg) {
case QCRYPTO_AKCIPHER_ALG_RSA:
return qcrypto_nettle_rsa_new(&opts->u.rsa, type, key, keylen, errp);
default:
error_setg(errp, "Unsupported algorithm: %u", opts->alg);
return NULL;
}
return NULL;
}
static void qcrypto_nettle_rsa_set_akcipher_size(QCryptoAkCipher *akcipher,
int key_size)
{
akcipher->max_plaintext_len = key_size;
akcipher->max_ciphertext_len = key_size;
akcipher->max_signature_len = key_size;
akcipher->max_dgst_len = key_size;
}
static int qcrypt_nettle_parse_rsa_private_key(QCryptoNettleRSA *rsa,
const uint8_t *key,
size_t keylen,
Error **errp)
{
g_autoptr(QCryptoAkCipherRSAKey) rsa_key = qcrypto_akcipher_rsakey_parse(
QCRYPTO_AKCIPHER_KEY_TYPE_PRIVATE, key, keylen, errp);
if (!rsa_key) {
return -1;
}
nettle_mpz_init_set_str_256_u(rsa->pub.n, rsa_key->n.len, rsa_key->n.data);
nettle_mpz_init_set_str_256_u(rsa->pub.e, rsa_key->e.len, rsa_key->e.data);
nettle_mpz_init_set_str_256_u(rsa->priv.d, rsa_key->d.len, rsa_key->d.data);
nettle_mpz_init_set_str_256_u(rsa->priv.p, rsa_key->p.len, rsa_key->p.data);
nettle_mpz_init_set_str_256_u(rsa->priv.q, rsa_key->q.len, rsa_key->q.data);
nettle_mpz_init_set_str_256_u(rsa->priv.a, rsa_key->dp.len,
rsa_key->dp.data);
nettle_mpz_init_set_str_256_u(rsa->priv.b, rsa_key->dq.len,
rsa_key->dq.data);
nettle_mpz_init_set_str_256_u(rsa->priv.c, rsa_key->u.len, rsa_key->u.data);
if (!rsa_public_key_prepare(&rsa->pub)) {
error_setg(errp, "Failed to check RSA key");
return -1;
}
/**
* Since in the kernel's unit test, the p, q, a, b, c of some
* private keys is 0, only the simplest length check is done here
*/
if (rsa_key->p.len > 1 &&
rsa_key->q.len > 1 &&
rsa_key->dp.len > 1 &&
rsa_key->dq.len > 1 &&
rsa_key->u.len > 1) {
if (!rsa_private_key_prepare(&rsa->priv)) {
error_setg(errp, "Failed to check RSA key");
return -1;
}
} else {
rsa->priv.size = rsa->pub.size;
}
qcrypto_nettle_rsa_set_akcipher_size(
(QCryptoAkCipher *)rsa, rsa->priv.size);
return 0;
}
static int qcrypt_nettle_parse_rsa_public_key(QCryptoNettleRSA *rsa,
const uint8_t *key,
size_t keylen,
Error **errp)
{
g_autoptr(QCryptoAkCipherRSAKey) rsa_key = qcrypto_akcipher_rsakey_parse(
QCRYPTO_AKCIPHER_KEY_TYPE_PUBLIC, key, keylen, errp);
if (!rsa_key) {
return -1;
}
nettle_mpz_init_set_str_256_u(rsa->pub.n, rsa_key->n.len, rsa_key->n.data);
nettle_mpz_init_set_str_256_u(rsa->pub.e, rsa_key->e.len, rsa_key->e.data);
if (!rsa_public_key_prepare(&rsa->pub)) {
error_setg(errp, "Failed to check RSA key");
return -1;
}
qcrypto_nettle_rsa_set_akcipher_size(
(QCryptoAkCipher *)rsa, rsa->pub.size);
return 0;
}
static void wrap_nettle_random_func(void *ctx, size_t len, uint8_t *out)
{
qcrypto_random_bytes(out, len, &error_abort);
}
static int qcrypto_nettle_rsa_encrypt(QCryptoAkCipher *akcipher,
const void *data, size_t data_len,
void *enc, size_t enc_len,
Error **errp)
{
QCryptoNettleRSA *rsa = (QCryptoNettleRSA *)akcipher;
mpz_t c;
int ret = -1;
if (data_len > rsa->pub.size) {
error_setg(errp, "Plaintext length %zu is greater than key size: %zu"
data_len, rsa->pub.size);
return ret;
}
if (enc_len < rsa->pub.size) {
error_setg(errp, "Ciphertext buffer length %zu is less than "
"key size: %zu", rsa->pub.size);
return ret;
}
/* Nettle do not support RSA encryption without any padding */
switch (rsa->padding_alg) {
case QCRYPTO_RSA_PADDING_ALG_RAW:
error_setg(errp, "RSA with raw padding is not supported");
break;
case QCRYPTO_RSA_PADDING_ALG_PKCS1:
mpz_init(c);
if (rsa_encrypt(&rsa->pub, NULL, wrap_nettle_random_func,
data_len, (uint8_t *)data, c) != 1) {
error_setg(errp, "Failed to encrypt");
} else {
nettle_mpz_get_str_256(enc_len, (uint8_t *)enc, c);
ret = nettle_mpz_sizeinbase_256_u(c);
}
mpz_clear(c);
break;
default:
error_setg(errp, "Unknown padding");
}
return ret;
}
static int qcrypto_nettle_rsa_decrypt(QCryptoAkCipher *akcipher,
const void *enc, size_t enc_len,
void *data, size_t data_len,
Error **errp)
{
QCryptoNettleRSA *rsa = (QCryptoNettleRSA *)akcipher;
mpz_t c;
int ret = -1;
if (enc_len > rsa->priv.size) {
error_setg(errp, "Ciphertext length %zu is greater than key size: %zu",
rsa->priv.size);
return ret;
}
switch (rsa->padding_alg) {
case QCRYPTO_RSA_PADDING_ALG_RAW:
error_setg(errp, "RSA with raw padding is not supported");
break;
case QCRYPTO_RSA_PADDING_ALG_PKCS1:
nettle_mpz_init_set_str_256_u(c, enc_len, enc);
if (!rsa_decrypt(&rsa->priv, &data_len, (uint8_t *)data, c)) {
error_setg(errp, "Failed to decrypt");
} else {
ret = data_len;
}
mpz_clear(c);
break;
default:
error_setg(errp, "Unknown padding algorithm: %d", rsa->padding_alg);
}
return ret;
}
static int qcrypto_nettle_rsa_sign(QCryptoAkCipher *akcipher,
const void *data, size_t data_len,
void *sig, size_t sig_len, Error **errp)
{
QCryptoNettleRSA *rsa = (QCryptoNettleRSA *)akcipher;
int ret = -1, rv;
mpz_t s;
/**
* The RSA algorithm cannot be used for signature/verification
* without padding.
*/
if (rsa->padding_alg == QCRYPTO_RSA_PADDING_ALG_RAW) {
error_setg(errp, "Try to make signature without padding");
return ret;
}
if (data_len > rsa->priv.size) {
error_setg(errp, "Data length %zu is greater than key size: %zu",
rsa->priv.size);
return ret;
}
if (sig_len < rsa->priv.size) {
error_setg(errp, "Signature buffer length %zu is less than "
"key size: %zu", rsa->priv.size);
return ret;
}
mpz_init(s);
switch (rsa->hash_alg) {
case QCRYPTO_HASH_ALG_MD5:
rv = rsa_md5_sign_digest(&rsa->priv, data, s);
break;
case QCRYPTO_HASH_ALG_SHA1:
rv = rsa_sha1_sign_digest(&rsa->priv, data, s);
break;
case QCRYPTO_HASH_ALG_SHA256:
rv = rsa_sha256_sign_digest(&rsa->priv, data, s);
break;
case QCRYPTO_HASH_ALG_SHA512:
rv = rsa_sha512_sign_digest(&rsa->priv, data, s);
break;
default:
error_setg(errp, "Unknown hash algorithm: %d", rsa->hash_alg);
goto cleanup;
}
if (rv != 1) {
error_setg(errp, "Failed to make signature");
goto cleanup;
}
nettle_mpz_get_str_256(sig_len, (uint8_t *)sig, s);
ret = nettle_mpz_sizeinbase_256_u(s);
cleanup:
mpz_clear(s);
return ret;
}
static int qcrypto_nettle_rsa_verify(QCryptoAkCipher *akcipher,
const void *sig, size_t sig_len,
const void *data, size_t data_len,
Error **errp)
{
QCryptoNettleRSA *rsa = (QCryptoNettleRSA *)akcipher;
int ret = -1, rv;
mpz_t s;
/**
* The RSA algorithm cannot be used for signature/verification
* without padding.
*/
if (rsa->padding_alg == QCRYPTO_RSA_PADDING_ALG_RAW) {
error_setg(errp, "Try to verify signature without padding");
return ret;
}
if (data_len > rsa->pub.size) {
error_setg(errp, "Data length %zu is greater than key size: %zu",
rsa->pub.size);
return ret;
}
if (sig_len < rsa->pub.size) {
error_setg(errp, "Signature length %zu is greater than key size: %zu",
rsa->pub.size);
return ret;
}
nettle_mpz_init_set_str_256_u(s, sig_len, sig);
switch (rsa->hash_alg) {
case QCRYPTO_HASH_ALG_MD5:
rv = rsa_md5_verify_digest(&rsa->pub, data, s);
break;
case QCRYPTO_HASH_ALG_SHA1:
rv = rsa_sha1_verify_digest(&rsa->pub, data, s);
break;
case QCRYPTO_HASH_ALG_SHA256:
rv = rsa_sha256_verify_digest(&rsa->pub, data, s);
break;
case QCRYPTO_HASH_ALG_SHA512:
rv = rsa_sha512_verify_digest(&rsa->pub, data, s);
break;
default:
error_setg(errp, "Unsupported hash algorithm: %d", rsa->hash_alg);
goto cleanup;
}
if (rv != 1) {
error_setg(errp, "Failed to verify signature");
goto cleanup;
}
ret = 0;
cleanup:
mpz_clear(s);
return ret;
}
QCryptoAkCipherDriver nettle_rsa = {
.encrypt = qcrypto_nettle_rsa_encrypt,
.decrypt = qcrypto_nettle_rsa_decrypt,
.sign = qcrypto_nettle_rsa_sign,
.verify = qcrypto_nettle_rsa_verify,
.free = qcrypto_nettle_rsa_free,
};
static QCryptoAkCipher *qcrypto_nettle_rsa_new(
const QCryptoAkCipherOptionsRSA *opt,
QCryptoAkCipherKeyType type,
const uint8_t *key, size_t keylen,
Error **errp)
{
QCryptoNettleRSA *rsa = g_new0(QCryptoNettleRSA, 1);
rsa->padding_alg = opt->padding_alg;
rsa->hash_alg = opt->hash_alg;
rsa->akcipher.driver = &nettle_rsa;
rsa_public_key_init(&rsa->pub);
rsa_private_key_init(&rsa->priv);
switch (type) {
case QCRYPTO_AKCIPHER_KEY_TYPE_PRIVATE:
if (qcrypt_nettle_parse_rsa_private_key(rsa, key, keylen, errp) != 0) {
goto error;
}
break;
case QCRYPTO_AKCIPHER_KEY_TYPE_PUBLIC:
if (qcrypt_nettle_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 (QCryptoAkCipher *)rsa;
error:
qcrypto_nettle_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_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;
}
case QCRYPTO_RSA_PADDING_ALG_RAW:
default:
return false;
}
break;
default:
return false;
}
}

4
crypto/akcipher.c
View File

@ -23,6 +23,9 @@
#include "crypto/akcipher.h"
#include "akcipherpriv.h"
#if defined(CONFIG_NETTLE) && defined(CONFIG_HOGWEED)
#include "akcipher-nettle.c.inc"
#else
QCryptoAkCipher *qcrypto_akcipher_new(const QCryptoAkCipherOptions *opts,
QCryptoAkCipherKeyType type,
const uint8_t *key, size_t keylen,
@ -37,6 +40,7 @@ bool qcrypto_akcipher_supports(QCryptoAkCipherOptions *opts)
{
return false;
}
#endif
int qcrypto_akcipher_encrypt(QCryptoAkCipher *akcipher,
const void *in, size_t in_len,

4
crypto/meson.build
View File

@ -21,10 +21,14 @@ crypto_ss.add(files(
'tlscredspsk.c',
'tlscredsx509.c',
'tlssession.c',
'rsakey.c',
))
if nettle.found()
crypto_ss.add(nettle, files('hash-nettle.c', 'hmac-nettle.c', 'pbkdf-nettle.c'))
if hogweed.found()
crypto_ss.add(gmp, hogweed)
endif
if xts == 'private'
crypto_ss.add(files('xts.c'))
endif

200
crypto/rsakey-builtin.c.inc Normal file
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@ -0,0 +1,200 @@
/*
* QEMU Crypto akcipher algorithms
*
* Copyright (c) 2022 Bytedance
* Author: lei he <helei.sig11@bytedance.com>
*
* This library 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 library 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 library; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include "der.h"
#include "rsakey.h"
static int extract_mpi(void *ctx, const uint8_t *value,
size_t vlen, Error **errp)
{
QCryptoAkCipherMPI *mpi = (QCryptoAkCipherMPI *)ctx;
if (vlen == 0) {
error_setg(errp, "Empty mpi field");
return -1;
}
mpi->data = g_memdup2(value, vlen);
mpi->len = vlen;
return 0;
}
static int extract_version(void *ctx, const uint8_t *value,
size_t vlen, Error **errp)
{
uint8_t *version = (uint8_t *)ctx;
if (vlen != 1 || *value > 1) {
error_setg(errp, "Invalid rsakey version");
return -1;
}
*version = *value;
return 0;
}
static int extract_seq_content(void *ctx, const uint8_t *value,
size_t vlen, Error **errp)
{
const uint8_t **content = (const uint8_t **)ctx;
if (vlen == 0) {
error_setg(errp, "Empty sequence");
return -1;
}
*content = value;
return 0;
}
/**
*
* RsaPubKey ::= SEQUENCE {
* n INTEGER
* e INTEGER
* }
*/
static QCryptoAkCipherRSAKey *qcrypto_builtin_rsa_public_key_parse(
const uint8_t *key, size_t keylen, Error **errp)
{
QCryptoAkCipherRSAKey *rsa = g_new0(QCryptoAkCipherRSAKey, 1);
const uint8_t *seq;
size_t seq_length;
int decode_ret;
decode_ret = qcrypto_der_decode_seq(&key, &keylen,
extract_seq_content, &seq, errp);
if (decode_ret < 0 || keylen != 0) {
goto error;
}
seq_length = decode_ret;
if (qcrypto_der_decode_int(&seq, &seq_length, extract_mpi,
&rsa->n, errp) < 0 ||
qcrypto_der_decode_int(&seq, &seq_length, extract_mpi,
&rsa->e, errp) < 0) {
goto error;
}
if (seq_length != 0) {
goto error;
}
return rsa;
error:
if (errp && !*errp) {
error_setg(errp, "Invalid RSA public key");
}
qcrypto_akcipher_rsakey_free(rsa);
return NULL;
}
/**
* RsaPrivKey ::= SEQUENCE {
* version INTEGER
* n INTEGER
* e INTEGER
* d INTEGER
* p INTEGER
* q INTEGER
* dp INTEGER
* dq INTEGER
* u INTEGER
* otherPrimeInfos OtherPrimeInfos OPTIONAL
* }
*/
static QCryptoAkCipherRSAKey *qcrypto_builtin_rsa_private_key_parse(
const uint8_t *key, size_t keylen, Error **errp)
{
QCryptoAkCipherRSAKey *rsa = g_new0(QCryptoAkCipherRSAKey, 1);
uint8_t version;
const uint8_t *seq;
int decode_ret;
size_t seq_length;
decode_ret = qcrypto_der_decode_seq(&key, &keylen, extract_seq_content,
&seq, errp);
if (decode_ret < 0 || keylen != 0) {
goto error;
}
seq_length = decode_ret;
decode_ret = qcrypto_der_decode_int(&seq, &seq_length, extract_version,
&version, errp);
if (qcrypto_der_decode_int(&seq, &seq_length, extract_mpi,
&rsa->n, errp) < 0 ||
qcrypto_der_decode_int(&seq, &seq_length, extract_mpi,
&rsa->e, errp) < 0 ||
qcrypto_der_decode_int(&seq, &seq_length, extract_mpi,
&rsa->d, errp) < 0 ||
qcrypto_der_decode_int(&seq, &seq_length, extract_mpi, &rsa->p,
errp) < 0 ||
qcrypto_der_decode_int(&seq, &seq_length, extract_mpi, &rsa->q,
errp) < 0 ||
qcrypto_der_decode_int(&seq, &seq_length, extract_mpi, &rsa->dp,
errp) < 0 ||
qcrypto_der_decode_int(&seq, &seq_length, extract_mpi, &rsa->dq,
errp) < 0 ||
qcrypto_der_decode_int(&seq, &seq_length, extract_mpi, &rsa->u,
errp) < 0) {
goto error;
}
/**
* According to the standard, otherPrimeInfos must be present for version 1.
* There is no strict verification here, this is to be compatible with
* the unit test of the kernel. TODO: remove this until linux kernel's
* unit-test is fixed.
*/
if (version == 1 && seq_length != 0) {
if (qcrypto_der_decode_seq(&seq, &seq_length, NULL, NULL, errp) < 0) {
goto error;
}
if (seq_length != 0) {
goto error;
}
return rsa;
}
if (seq_length != 0) {
goto error;
}
return rsa;
error:
if (errp && !*errp) {
error_setg(errp, "Invalid RSA private key");
}
qcrypto_akcipher_rsakey_free(rsa);
return NULL;
}
QCryptoAkCipherRSAKey *qcrypto_akcipher_rsakey_parse(
QCryptoAkCipherKeyType type, const uint8_t *key,
size_t keylen, Error **errp)
{
switch (type) {
case QCRYPTO_AKCIPHER_KEY_TYPE_PRIVATE:
return qcrypto_builtin_rsa_private_key_parse(key, keylen, errp);
case QCRYPTO_AKCIPHER_KEY_TYPE_PUBLIC:
return qcrypto_builtin_rsa_public_key_parse(key, keylen, errp);
default:
error_setg(errp, "Unknown key type: %d", type);
return NULL;
}
}

158
crypto/rsakey-nettle.c.inc Normal file
View File

@ -0,0 +1,158 @@
/*
* QEMU Crypto akcipher algorithms
*
* Copyright (c) 2022 Bytedance
* Author: lei he <helei.sig11@bytedance.com>
*
* This library 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 library 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 library; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include <nettle/asn1.h>
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "rsakey.h"
static bool DumpMPI(struct asn1_der_iterator *i, QCryptoAkCipherMPI *mpi)
{
mpi->data = g_memdup2(i->data, i->length);
mpi->len = i->length;
return true;
}
static bool GetMPI(struct asn1_der_iterator *i, QCryptoAkCipherMPI *mpi)
{
if (asn1_der_iterator_next(i) != ASN1_ITERATOR_PRIMITIVE ||
i->type != ASN1_INTEGER) {
return false;
}
return DumpMPI(i, mpi);
}
/**
* RsaPrivKey ::= SEQUENCE {
* version INTEGER
* n INTEGER
* e INTEGER
* d INTEGER
* p INTEGER
* q INTEGER
* dp INTEGER
* dq INTEGER
* u INTEGER
* otherPrimeInfos OtherPrimeInfos OPTIONAL
* }
*/
static QCryptoAkCipherRSAKey *qcrypto_nettle_rsa_private_key_parse(
const uint8_t *key, size_t keylen, Error **errp)
{
QCryptoAkCipherRSAKey *rsa = g_new0(QCryptoAkCipherRSAKey, 1);
struct asn1_der_iterator i;
uint32_t version;
int tag;
/* Parse entire struct */
if (asn1_der_iterator_first(&i, keylen, key) != ASN1_ITERATOR_CONSTRUCTED ||
i.type != ASN1_SEQUENCE ||
asn1_der_decode_constructed_last(&i) != ASN1_ITERATOR_PRIMITIVE ||
i.type != ASN1_INTEGER ||
!asn1_der_get_uint32(&i, &version) ||
version > 1 ||
!GetMPI(&i, &rsa->n) ||
!GetMPI(&i, &rsa->e) ||
!GetMPI(&i, &rsa->d) ||
!GetMPI(&i, &rsa->p) ||
!GetMPI(&i, &rsa->q) ||
!GetMPI(&i, &rsa->dp) ||
!GetMPI(&i, &rsa->dq) ||
!GetMPI(&i, &rsa->u)) {
goto error;
}
if (version == 1) {
tag = asn1_der_iterator_next(&i);
/**
* According to the standard otherPrimeInfos must be present for
* version 1. There is no strict verification here, this is to be
* compatible with the unit test of the kernel. TODO: remove this
* until linux-kernel's unit-test is fixed;
*/
if (tag == ASN1_ITERATOR_END) {
return rsa;
}
if (tag != ASN1_ITERATOR_CONSTRUCTED ||
i.type != ASN1_SEQUENCE) {
goto error;
}
}
if (asn1_der_iterator_next(&i) != ASN1_ITERATOR_END) {
goto error;
}
return rsa;
error:
error_setg(errp, "Failed to parse RSA private key");
qcrypto_akcipher_rsakey_free(rsa);
return NULL;
}
/**
* RsaPubKey ::= SEQUENCE {
* n INTEGER
* e INTEGER
* }
*/
static QCryptoAkCipherRSAKey *qcrypto_nettle_rsa_public_key_parse(
const uint8_t *key, size_t keylen, Error **errp)
{
QCryptoAkCipherRSAKey *rsa = g_new0(QCryptoAkCipherRSAKey, 1);
struct asn1_der_iterator i;
if (asn1_der_iterator_first(&i, keylen, key) != ASN1_ITERATOR_CONSTRUCTED ||
i.type != ASN1_SEQUENCE ||
asn1_der_decode_constructed_last(&i) != ASN1_ITERATOR_PRIMITIVE ||
!DumpMPI(&i, &rsa->n) ||
!GetMPI(&i, &rsa->e) ||
asn1_der_iterator_next(&i) != ASN1_ITERATOR_END) {
goto error;
}
return rsa;
error:
error_setg(errp, "Failed to parse RSA public key");
qcrypto_akcipher_rsakey_free(rsa);
return NULL;
}
QCryptoAkCipherRSAKey *qcrypto_akcipher_rsakey_parse(
QCryptoAkCipherKeyType type, const uint8_t *key,
size_t keylen, Error **errp)
{
switch (type) {
case QCRYPTO_AKCIPHER_KEY_TYPE_PRIVATE:
return qcrypto_nettle_rsa_private_key_parse(key, keylen, errp);
case QCRYPTO_AKCIPHER_KEY_TYPE_PUBLIC:
return qcrypto_nettle_rsa_public_key_parse(key, keylen, errp);
default:
error_setg(errp, "Unknown key type: %d", type);
return NULL;
}
}

44
crypto/rsakey.c Normal file
View File

@ -0,0 +1,44 @@
/*
* QEMU Crypto RSA key parser
*
* Copyright (c) 2022 Bytedance
* Author: lei he <helei.sig11@bytedance.com>
*
* This library 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 library 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 library; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include "rsakey.h"
void qcrypto_akcipher_rsakey_free(QCryptoAkCipherRSAKey *rsa_key)
{
if (!rsa_key) {
return;
}
g_free(rsa_key->n.data);
g_free(rsa_key->e.data);
g_free(rsa_key->d.data);
g_free(rsa_key->p.data);
g_free(rsa_key->q.data);
g_free(rsa_key->dp.data);
g_free(rsa_key->dq.data);
g_free(rsa_key->u.data);
g_free(rsa_key);
}
#if defined(CONFIG_NETTLE) && defined(CONFIG_HOGWEED)
#include "rsakey-nettle.c.inc"
#else
#include "rsakey-builtin.c.inc"
#endif

92
crypto/rsakey.h Normal file
View File

@ -0,0 +1,92 @@
/*
* QEMU Crypto RSA key parser
*
* Copyright (c) 2022 Bytedance
* Author: lei he <helei.sig11@bytedance.com>
*
* This library 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 library 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 library; if not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef QCRYPTO_RSAKEY_H
#define QCRYPTO_RSAKEY_H
#include "qemu/osdep.h"
#include "qemu/host-utils.h"
#include "crypto/akcipher.h"
typedef struct QCryptoAkCipherRSAKey QCryptoAkCipherRSAKey;
typedef struct QCryptoAkCipherMPI QCryptoAkCipherMPI;
/**
* Multiple precious integer, encoded as two' complement,
* copied directly from DER encoded ASN.1 structures.
*/
struct QCryptoAkCipherMPI {
uint8_t *data;
size_t len;
};
/* See rfc2437: https://datatracker.ietf.org/doc/html/rfc2437 */
struct QCryptoAkCipherRSAKey {
/* The modulus */
QCryptoAkCipherMPI n;
/* The public exponent */
QCryptoAkCipherMPI e;
/* The private exponent */
QCryptoAkCipherMPI d;
/* The first factor */
QCryptoAkCipherMPI p;
/* The second factor */
QCryptoAkCipherMPI q;
/* The first factor's exponent */
QCryptoAkCipherMPI dp;
/* The second factor's exponent */
QCryptoAkCipherMPI dq;
/* The CRT coefficient */
QCryptoAkCipherMPI u;
};
/**
* Parse DER encoded ASN.1 RSA keys, expected ASN.1 schemas:
* RsaPrivKey ::= SEQUENCE {
* version INTEGER
* n INTEGER
* e INTEGER
* d INTEGER
* p INTEGER
* q INTEGER
* dp INTEGER
* dq INTEGER
* u INTEGER
* otherPrimeInfos OtherPrimeInfos OPTIONAL
* }
*
* RsaPubKey ::= SEQUENCE {
* n INTEGER
* e INTEGER
* }
*
* Returns: On success QCryptoAkCipherRSAKey is returned, otherwise returns NULL
*/
QCryptoAkCipherRSAKey *qcrypto_akcipher_rsakey_parse(
QCryptoAkCipherKeyType type,
const uint8_t *key, size_t keylen, Error **errp);
void qcrypto_akcipher_rsakey_free(QCryptoAkCipherRSAKey *key);
G_DEFINE_AUTOPTR_CLEANUP_FUNC(QCryptoAkCipherRSAKey,
qcrypto_akcipher_rsakey_free);
#endif

11
meson.build
View File

@ -1121,6 +1121,7 @@ endif
# gcrypt over nettle for performance reasons.
gcrypt = not_found
nettle = not_found
hogweed = not_found
xts = 'none'
if get_option('nettle').enabled() and get_option('gcrypt').enabled()
@ -1158,6 +1159,15 @@ if not gnutls_crypto.found()
endif
endif
gmp = dependency('gmp', required: false, method: 'pkg-config', kwargs: static_kwargs)
if nettle.found() and gmp.found()
hogweed = dependency('hogweed', version: '>=3.4',
method: 'pkg-config',
required: get_option('nettle'),
kwargs: static_kwargs)
endif
gtk = not_found
gtkx11 = not_found
vte = not_found
@ -1769,6 +1779,7 @@ config_host_data.set('CONFIG_GNUTLS_CRYPTO', gnutls_crypto.found())
config_host_data.set('CONFIG_TASN1', tasn1.found())
config_host_data.set('CONFIG_GCRYPT', gcrypt.found())
config_host_data.set('CONFIG_NETTLE', nettle.found())
config_host_data.set('CONFIG_HOGWEED', hogweed.found())
config_host_data.set('CONFIG_QEMU_PRIVATE_XTS', xts == 'private')
config_host_data.set('CONFIG_MALLOC_TRIM', has_malloc_trim)
config_host_data.set('CONFIG_STATX', has_statx)