2022-04-28 18:17:05

by zhenwei pi

[permalink] [raw]
Subject: [PATCH v5 5/9] crypto: Implement RSA algorithm by hogweed

From: Lei He <[email protected]>

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 <[email protected]>
Signed-off-by: zhenwei pi <[email protected]>
---
crypto/akcipher-nettle.c.inc | 432 +++++++++++++++++++++++++++++++++++
crypto/akcipher.c | 4 +
crypto/meson.build | 4 +
crypto/rsakey-builtin.c.inc | 209 +++++++++++++++++
crypto/rsakey-nettle.c.inc | 154 +++++++++++++
crypto/rsakey.c | 44 ++++
crypto/rsakey.h | 94 ++++++++
meson.build | 11 +
8 files changed, 952 insertions(+)
create mode 100644 crypto/akcipher-nettle.c.inc
create mode 100644 crypto/rsakey-builtin.c.inc
create mode 100644 crypto/rsakey-nettle.c.inc
create mode 100644 crypto/rsakey.c
create mode 100644 crypto/rsakey.h

diff --git a/crypto/akcipher-nettle.c.inc b/crypto/akcipher-nettle.c.inc
new file mode 100644
index 0000000000..1f688aa0f1
--- /dev/null
+++ b/crypto/akcipher-nettle.c.inc
@@ -0,0 +1,432 @@
+/*
+ * QEMU Crypto akcipher algorithms
+ *
+ * Copyright (c) 2022 Bytedance
+ * Author: lei he <[email protected]>
+ *
+ * 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)
+{
+ g_autoptr(QCryptoAkCipherRSAKey) rsa_key = qcrypto_akcipher_rsakey_parse(
+ QCRYPTO_AKCIPHER_KEY_TYPE_PRIVATE, key, keylen);
+
+ 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)) {
+ 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)) {
+ 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)
+{
+ g_autoptr(QCryptoAkCipherRSAKey) rsa_key = qcrypto_akcipher_rsakey_parse(
+ QCRYPTO_AKCIPHER_KEY_TYPE_PUBLIC, key, keylen);
+
+ 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)) {
+ 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)
+{
+ /* TODO: check result */
+ qcrypto_random_bytes(out, len, NULL);
+}
+
+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 || enc_len != rsa->pub.size) {
+ error_setg(errp, "Invalid buffer 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 = enc_len;
+ }
+ 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, "Invalid buffer 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:
+ ret = -1;
+ error_setg(errp, "Unknown padding");
+ }
+
+ 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;
+ 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 -1;
+ }
+
+ if (data_len > rsa->priv.size || sig_len != rsa->priv.size) {
+ error_setg(errp, "Invalid buffer size");
+ return -1;
+ }
+
+ mpz_init(s);
+ switch (rsa->hash_alg) {
+ case QCRYPTO_HASH_ALG_MD5:
+ ret = rsa_md5_sign_digest(&rsa->priv, data, s);
+ break;
+
+ case QCRYPTO_HASH_ALG_SHA1:
+ ret = rsa_sha1_sign_digest(&rsa->priv, data, s);
+ break;
+
+ case QCRYPTO_HASH_ALG_SHA256:
+ ret = rsa_sha256_sign_digest(&rsa->priv, data, s);
+ break;
+
+ case QCRYPTO_HASH_ALG_SHA512:
+ ret = rsa_sha512_sign_digest(&rsa->priv, data, s);
+ break;
+
+ default:
+ error_setg(errp, "Unknown hash algorithm");
+ ret = -1;
+ goto cleanup;
+ }
+
+ if (ret != 1) {
+ error_setg(errp, "Failed to make signature");
+ ret = -1;
+ goto cleanup;
+ }
+ nettle_mpz_get_str_256(sig_len, (uint8_t *)sig, s);
+ ret = sig_len;
+
+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;
+ 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, "Operation not supported");
+ return -1;
+ }
+ if (data_len > rsa->pub.size || sig_len < rsa->pub.size) {
+ error_setg(errp, "Invalid buffer size");
+ return -1;
+ }
+
+ nettle_mpz_init_set_str_256_u(s, sig_len, sig);
+ switch (rsa->hash_alg) {
+ case QCRYPTO_HASH_ALG_MD5:
+ ret = rsa_md5_verify_digest(&rsa->pub, data, s);
+ break;
+
+ case QCRYPTO_HASH_ALG_SHA1:
+ ret = rsa_sha1_verify_digest(&rsa->pub, data, s);
+ break;
+
+ case QCRYPTO_HASH_ALG_SHA256:
+ ret = rsa_sha256_verify_digest(&rsa->pub, data, s);
+ break;
+
+ case QCRYPTO_HASH_ALG_SHA512:
+ ret = rsa_sha512_verify_digest(&rsa->pub, data, s);
+ break;
+
+ default:
+ error_setg(errp, "Unsupported hash algorithm");
+ ret = -1;
+ goto cleanup;
+ }
+
+ if (ret != 1) {
+ error_setg(errp, "Failed to verify");
+ ret = -1;
+ 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) != 0) {
+ error_setg(errp, "Failed to parse rsa private key");
+ goto error;
+ }
+ break;
+
+ case QCRYPTO_AKCIPHER_KEY_TYPE_PUBLIC:
+ if (qcrypt_nettle_parse_rsa_public_key(rsa, key, keylen) != 0) {
+ error_setg(errp, "Failed to parse rsa public rsa key");
+ 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;
+ }
+}
diff --git a/crypto/akcipher.c b/crypto/akcipher.c
index ab28bf415b..f287083f92 100644
--- a/crypto/akcipher.c
+++ b/crypto/akcipher.c
@@ -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,
diff --git a/crypto/meson.build b/crypto/meson.build
index c9b36857a6..d9294eed83 100644
--- a/crypto/meson.build
+++ b/crypto/meson.build
@@ -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
diff --git a/crypto/rsakey-builtin.c.inc b/crypto/rsakey-builtin.c.inc
new file mode 100644
index 0000000000..0a93712f4f
--- /dev/null
+++ b/crypto/rsakey-builtin.c.inc
@@ -0,0 +1,209 @@
+/*
+ * QEMU Crypto akcipher algorithms
+ *
+ * Copyright (c) 2022 Bytedance
+ * Author: lei he <[email protected]>
+ *
+ * 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)
+{
+ QCryptoAkCipherRSAKey *rsa = g_new0(QCryptoAkCipherRSAKey, 1);
+ const uint8_t *seq;
+ size_t seq_length;
+ int decode_ret;
+ Error *local_error = NULL;
+
+ decode_ret = qcrypto_der_decode_seq(&key, &keylen,
+ extract_seq_content, &seq, &local_error);
+ if (decode_ret < 0) {
+ error_report_err(local_error);
+ goto error;
+ }
+ if (keylen != 0) {
+ goto error;
+ }
+ seq_length = decode_ret;
+
+ if (qcrypto_der_decode_int(&seq, &seq_length, extract_mpi,
+ &rsa->n, &local_error) < 0 ||
+ qcrypto_der_decode_int(&seq, &seq_length, extract_mpi,
+ &rsa->e, &local_error) < 0) {
+ error_report_err(local_error);
+ goto error;
+ }
+ if (seq_length != 0) {
+ goto error;
+ }
+
+ return rsa;
+
+error:
+ 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)
+{
+ QCryptoAkCipherRSAKey *rsa = g_new0(QCryptoAkCipherRSAKey, 1);
+ uint8_t version;
+ const uint8_t *seq;
+ int decode_ret;
+ size_t seq_length;
+ Error *local_error = NULL;
+
+ decode_ret = qcrypto_der_decode_seq(&key, &keylen,
+ extract_seq_content, &seq, &local_error);
+ if (decode_ret < 0) {
+ error_report_err(local_error);
+ goto error;
+ }
+ if (keylen != 0) {
+ goto error;
+ }
+ seq_length = decode_ret;
+
+ decode_ret = qcrypto_der_decode_int(&seq, &seq_length, extract_version,
+ &version, &local_error);
+ if (decode_ret < 0) {
+ error_report_err(local_error);
+ goto error;
+ }
+
+ if (qcrypto_der_decode_int(&seq, &seq_length, extract_mpi,
+ &rsa->n, &local_error) < 0 ||
+ qcrypto_der_decode_int(&seq, &seq_length, extract_mpi,
+ &rsa->e, &local_error) < 0 ||
+ qcrypto_der_decode_int(&seq, &seq_length, extract_mpi,
+ &rsa->d, &local_error) < 0 ||
+ qcrypto_der_decode_int(&seq, &seq_length, extract_mpi, &rsa->p,
+ &local_error) < 0 ||
+ qcrypto_der_decode_int(&seq, &seq_length, extract_mpi, &rsa->q,
+ &local_error) < 0 ||
+ qcrypto_der_decode_int(&seq, &seq_length, extract_mpi, &rsa->dp,
+ &local_error) < 0 ||
+ qcrypto_der_decode_int(&seq, &seq_length, extract_mpi, &rsa->dq,
+ &local_error) < 0 ||
+ qcrypto_der_decode_int(&seq, &seq_length, extract_mpi, &rsa->u,
+ &local_error) < 0) {
+ error_report_err(local_error);
+ 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, &local_error) < 0) {
+ error_report_err(local_error);
+ goto error;
+ }
+ if (seq_length != 0) {
+ goto error;
+ }
+ return rsa;
+ }
+ if (seq_length != 0) {
+ goto error;
+ }
+
+ return rsa;
+
+error:
+ qcrypto_akcipher_rsakey_free(rsa);
+ return NULL;
+}
+
+QCryptoAkCipherRSAKey *qcrypto_akcipher_rsakey_parse(
+ QCryptoAkCipherKeyType type, const uint8_t *key, size_t keylen)
+{
+ switch (type) {
+ case QCRYPTO_AKCIPHER_KEY_TYPE_PRIVATE:
+ return qcrypto_builtin_rsa_private_key_parse(key, keylen);
+
+ case QCRYPTO_AKCIPHER_KEY_TYPE_PUBLIC:
+ return qcrypto_builtin_rsa_public_key_parse(key, keylen);
+
+ default:
+ return NULL;
+ }
+}
diff --git a/crypto/rsakey-nettle.c.inc b/crypto/rsakey-nettle.c.inc
new file mode 100644
index 0000000000..2c89b3be88
--- /dev/null
+++ b/crypto/rsakey-nettle.c.inc
@@ -0,0 +1,154 @@
+/*
+ * QEMU Crypto akcipher algorithms
+ *
+ * Copyright (c) 2022 Bytedance
+ * Author: lei he <[email protected]>
+ *
+ * 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 <stdbool.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)
+{
+ 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:
+ 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)
+{
+
+ 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:
+ qcrypto_akcipher_rsakey_free(rsa);
+ return NULL;
+}
+
+QCryptoAkCipherRSAKey *qcrypto_akcipher_rsakey_parse(
+ QCryptoAkCipherKeyType type, const uint8_t *key, size_t keylen)
+{
+ switch (type) {
+ case QCRYPTO_AKCIPHER_KEY_TYPE_PRIVATE:
+ return qcrypto_nettle_rsa_private_key_parse(key, keylen);
+
+ case QCRYPTO_AKCIPHER_KEY_TYPE_PUBLIC:
+ return qcrypto_nettle_rsa_public_key_parse(key, keylen);
+
+ default:
+ return NULL;
+ }
+}
diff --git a/crypto/rsakey.c b/crypto/rsakey.c
new file mode 100644
index 0000000000..cc40e072f0
--- /dev/null
+++ b/crypto/rsakey.c
@@ -0,0 +1,44 @@
+/*
+ * QEMU Crypto RSA key parser
+ *
+ * Copyright (c) 2022 Bytedance
+ * Author: lei he <[email protected]>
+ *
+ * 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
diff --git a/crypto/rsakey.h b/crypto/rsakey.h
new file mode 100644
index 0000000000..a1e04ae021
--- /dev/null
+++ b/crypto/rsakey.h
@@ -0,0 +1,94 @@
+/*
+ * QEMU Crypto RSA key parser
+ *
+ * Copyright (c) 2022 Bytedance
+ * Author: lei he <[email protected]>
+ *
+ * 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 <nettle/bignum.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);
+
+void qcrypto_akcipher_rsakey_free(QCryptoAkCipherRSAKey *key);
+
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(QCryptoAkCipherRSAKey,
+ qcrypto_akcipher_rsakey_free);
+
+#endif
diff --git a/meson.build b/meson.build
index d083c6b7bf..fd0bf7aa5d 100644
--- a/meson.build
+++ b/meson.build
@@ -1049,6 +1049,7 @@ 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()
@@ -1086,6 +1087,15 @@ 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
@@ -1567,6 +1577,7 @@ config_host_data.set('CONFIG_GNUTLS', gnutls.found())
config_host_data.set('CONFIG_GNUTLS_CRYPTO', gnutls_crypto.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)
--
2.20.1