From: Lei He <helei.si...@bytedance.com> Added gcryt implementation of RSA algorithm, RSA algorithm implemented by gcrypt has a higher priority than nettle because it supports raw padding.
Signed-off-by: Lei He <helei.si...@bytedance.com> --- crypto/akcipher-gcrypt.c.inc | 531 +++++++++++++++++++++++++++++++++++ crypto/akcipher.c | 4 +- 2 files changed, 534 insertions(+), 1 deletion(-) create mode 100644 crypto/akcipher-gcrypt.c.inc diff --git a/crypto/akcipher-gcrypt.c.inc b/crypto/akcipher-gcrypt.c.inc new file mode 100644 index 0000000000..c109bf0566 --- /dev/null +++ b/crypto/akcipher-gcrypt.c.inc @@ -0,0 +1,531 @@ +/* + * QEMU Crypto akcipher algorithms + * + * Copyright (c) 2022 Bytedance + * Author: lei he <helei.si...@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 <stdbool.h> + +#include <gcrypt.h> + +#include "qemu/osdep.h" +#include "qemu/host-utils.h" +#include "asn1_decoder.h" +#include "crypto/akcipher.h" +#include "crypto/random.h" +#include "qapi/error.h" +#include "sysemu/cryptodev.h" +#include "rsakey.h" + +typedef struct QCryptoGcryptRSA { + QCryptoAkCipher akcipher; + gcry_sexp_t key; + QCryptoRSAPaddingAlgorithm padding_alg; + QCryptoHashAlgorithm hash_alg; +} QCryptoGcryptRSA; + +static void qcrypto_gcrypt_rsa_destroy(QCryptoGcryptRSA *rsa) +{ + if (!rsa) { + return; + } + + gcry_sexp_release(rsa->key); + g_free(rsa); +} + +static QCryptoGcryptRSA *qcrypto_gcrypt_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->algorithm) { + case QCRYPTO_AKCIPHER_ALG_RSA: + return (QCryptoAkCipher *)qcrypto_gcrypt_rsa_new( + &opts->u.rsa, type, key, keylen, errp); + + default: + error_setg(errp, "Unsupported algorithm: %u", opts->algorithm); + return NULL; + } + + return NULL; +} + +static void qcrypto_gcrypt_set_rsa_size(QCryptoAkCipher *akcipher, gcry_mpi_t n) +{ + size_t key_size = (gcry_mpi_get_nbits(n) + 7) / 8; + akcipher->max_plaintext_len = key_size; + akcipher->max_ciphertext_len = key_size; + akcipher->max_dgst_len = key_size; + akcipher->max_signature_len = key_size; +} + +static int qcrypto_gcrypt_parse_rsa_private_key( + QCryptoGcryptRSA *rsa, + const uint8_t *key, size_t keylen) +{ + QCryptoAkCipherRSAKey *rsa_key = + qcrypto_akcipher_parse_rsa_private_key(key, keylen); + gcry_mpi_t n = NULL, e = NULL, d = NULL, p = NULL, q = NULL, u = NULL; + int ret = -1; + bool compute_mul_inv = false; + gcry_error_t err; + if (!rsa_key) { + return ret; + } + + err = gcry_mpi_scan(&n, GCRYMPI_FMT_STD, + rsa_key->n.data, rsa_key->n.len, NULL); + if (gcry_err_code(err) != 0) { + goto clear; + } + + err = gcry_mpi_scan(&e, GCRYMPI_FMT_STD, + rsa_key->e.data, rsa_key->e.len, NULL); + if (gcry_err_code(err) != 0) { + goto clear; + } + + err = gcry_mpi_scan(&d, GCRYMPI_FMT_STD, + rsa_key->d.data, rsa_key->d.len, NULL); + if (gcry_err_code(err) != 0) { + goto clear; + } + + err = gcry_mpi_scan(&p, GCRYMPI_FMT_STD, + rsa_key->p.data, rsa_key->p.len, NULL); + if (gcry_err_code(err) != 0) { + goto clear; + } + + err = gcry_mpi_scan(&q, GCRYMPI_FMT_STD, + rsa_key->q.data, rsa_key->q.len, NULL); + if (gcry_err_code(err) != 0) { + goto clear; + } + + if (gcry_mpi_cmp_ui(p, 0) > 0 && gcry_mpi_cmp_ui(q, 0) > 0) { + compute_mul_inv = true; + + u = gcry_mpi_new(0); + if (gcry_mpi_cmp(p, q) > 0) { + gcry_mpi_swap(p, q); + } + gcry_mpi_invm(u, p, q); + } + + if (compute_mul_inv) { + err = gcry_sexp_build(&rsa->key, NULL, + "(private-key (rsa (n %m) (e %m) (d %m) (p %m) (q %m) (u %m)))", + n, e, d, p, q, u); + } else { + err = gcry_sexp_build(&rsa->key, NULL, + "(private-key (rsa (n %m) (e %m) (d %m)))", n, e, d); + } + if (gcry_err_code(err) != 0) { + goto clear; + } + qcrypto_gcrypt_set_rsa_size((QCryptoAkCipher *)rsa, n); + ret = 0; + +clear: + qcrypto_akcipher_free_rsa_key(rsa_key); + gcry_mpi_release(n); + gcry_mpi_release(e); + gcry_mpi_release(d); + gcry_mpi_release(p); + gcry_mpi_release(q); + gcry_mpi_release(u); + return ret; +} + +static int qcrypto_gcrypt_parse_rsa_public_key(QCryptoGcryptRSA *rsa, + const uint8_t *key, + size_t keylen) +{ + + QCryptoAkCipherRSAKey *rsa_key = + qcrypto_akcipher_parse_rsa_public_key(key, keylen); + gcry_mpi_t n = NULL, e = NULL; + int ret = -1; + gcry_error_t err; + if (!rsa_key) { + return ret; + } + + err = gcry_mpi_scan(&n, GCRYMPI_FMT_STD, + rsa_key->n.data, rsa_key->n.len, NULL); + if (gcry_err_code(err) != 0) { + goto clear; + } + + err = gcry_mpi_scan(&e, GCRYMPI_FMT_STD, + rsa_key->e.data, rsa_key->e.len, NULL); + if (gcry_err_code(err) != 0) { + goto clear; + } + + err = gcry_sexp_build(&rsa->key, NULL, + "(public-key (rsa (n %m) (e %m)))", n, e); + if (gcry_err_code(err) != 0) { + goto clear; + } + qcrypto_gcrypt_set_rsa_size((QCryptoAkCipher *)rsa, n); + ret = 0; + +clear: + qcrypto_akcipher_free_rsa_key(rsa_key); + gcry_mpi_release(n); + gcry_mpi_release(e); + return ret; +} + +static int qcrypto_gcrypt_rsa_encrypt(QCryptoAkCipher *akcipher, + const void *in, size_t in_len, + void *out, size_t out_len, + Error **errp) +{ + QCryptoGcryptRSA *rsa = + container_of(akcipher, QCryptoGcryptRSA, akcipher); + int ret = -1; + gcry_sexp_t data_sexp = NULL, cipher_sexp = NULL; + gcry_sexp_t cipher_sexp_item = NULL; + gcry_mpi_t cipher_mpi = NULL; + const char *result; + gcry_error_t err; + size_t actual_len; + + if (in_len > akcipher->max_plaintext_len) { + error_setg(errp, "Invalid buffer size"); + return ret; + } + + err = gcry_sexp_build(&data_sexp, NULL, + "(data (flags %s) (value %b))", + QCryptoRSAPaddingAlgorithm_str(rsa->padding_alg), + in_len, in); + if (gcry_err_code(err) != 0) { + goto clear; + } + + err = gcry_pk_encrypt(&cipher_sexp, data_sexp, rsa->key); + if (gcry_err_code(err) != 0) { + goto clear; + } + + /* S-expression of cipher: (enc-val (rsa (a a-mpi))) */ + cipher_sexp_item = gcry_sexp_find_token(cipher_sexp, "a", 0); + if (!cipher_sexp_item || gcry_sexp_length(cipher_sexp_item) != 2) { + goto clear; + } + + if (rsa->padding_alg == QCRYPTO_RSA_PADDING_ALG_RAW) { + cipher_mpi = gcry_sexp_nth_mpi(cipher_sexp_item, 1, GCRYMPI_FMT_USG); + if (!cipher_mpi) { + goto clear; + } + err = gcry_mpi_print(GCRYMPI_FMT_USG, out, out_len, + &actual_len, cipher_mpi); + if (gcry_err_code(err) != 0 || actual_len > out_len) { + goto clear; + } + + /* We always padding leading-zeros for RSA-RAW */ + if (actual_len < out_len) { + memmove((uint8_t *)out + (out_len - actual_len), out, actual_len); + memset(out, 0, out_len - actual_len); + } + ret = out_len; + + } else { + result = gcry_sexp_nth_data(cipher_sexp_item, 1, &actual_len); + if (!result || actual_len > out_len) { + goto clear; + } + memcpy(out, result, actual_len); + ret = actual_len; + } + +clear: + gcry_sexp_release(data_sexp); + gcry_sexp_release(cipher_sexp); + gcry_sexp_release(cipher_sexp_item); + gcry_mpi_release(cipher_mpi); + return ret; +} + +static int qcrypto_gcrypt_rsa_decrypt(QCryptoAkCipher *akcipher, + const void *in, size_t in_len, + void *out, size_t out_len, + Error **errp) +{ + QCryptoGcryptRSA *rsa = + container_of(akcipher, QCryptoGcryptRSA, akcipher); + int ret = -1; + gcry_sexp_t data_sexp = NULL, cipher_sexp = NULL; + gcry_mpi_t data_mpi = NULL; + gcry_error_t err; + size_t actual_len; + const char *result; + + if (in_len > akcipher->max_ciphertext_len) { + error_setg(errp, "Invalid buffer size"); + return ret; + } + + err = gcry_sexp_build(&cipher_sexp, NULL, + "(enc-val (flags %s) (rsa (a %b) ))", + QCryptoRSAPaddingAlgorithm_str(rsa->padding_alg), + in_len, in); + if (gcry_err_code(err) != 0) { + goto clear; + } + + err = gcry_pk_decrypt(&data_sexp, cipher_sexp, rsa->key); + if (gcry_err_code(err) != 0) { + goto clear; + } + + /* S-expression of cipher: (value plaintext) */ + if (rsa->padding_alg == QCRYPTO_RSA_PADDING_ALG_RAW) { + data_mpi = gcry_sexp_nth_mpi(data_sexp, 1, GCRYMPI_FMT_USG); + if (!data_mpi) { + goto clear; + } + err = gcry_mpi_print(GCRYMPI_FMT_USG, out, out_len, + &actual_len, data_mpi); + if (gcry_err_code(err) != 0) { + goto clear; + } + if (actual_len > out_len) { + goto clear; + } + /* We always padding leading-zeros for RSA-RAW */ + if (actual_len < out_len) { + memmove((uint8_t *)out + (out_len - actual_len), out, actual_len); + memset(out, 0, out_len - actual_len); + } + ret = out_len; + } else { + result = gcry_sexp_nth_data(data_sexp, 1, &actual_len); + if (!result || actual_len > out_len) { + goto clear; + } + memcpy(out, result, actual_len); + ret = actual_len; + } + +clear: + gcry_sexp_release(cipher_sexp); + gcry_sexp_release(data_sexp); + gcry_mpi_release(data_mpi); + return ret; +} + +static int qcrypto_gcrypt_rsa_sign(QCryptoAkCipher *akcipher, + const void *in, size_t in_len, + void *out, size_t out_len, Error **errp) +{ + QCryptoGcryptRSA *rsa = + container_of(akcipher, QCryptoGcryptRSA, akcipher); + int ret = -1; + gcry_sexp_t dgst_sexp = NULL, sig_sexp = NULL; + gcry_sexp_t sig_sexp_item = NULL; + const char *result; + gcry_error_t err; + size_t actual_len; + + if (in_len > akcipher->max_dgst_len) { + error_setg(errp, "Invalid buffer size"); + return ret; + } + + if (rsa->padding_alg != QCRYPTO_RSA_PADDING_ALG_PKCS1) { + return ret; + } + err = gcry_sexp_build(&dgst_sexp, NULL, + "(data (flags pkcs1) (hash %s %b))", + QCryptoHashAlgorithm_str(rsa->hash_alg), + in_len, in); + + if (gcry_err_code(err) != 0) { + goto clear; + } + + err = gcry_pk_sign(&sig_sexp, dgst_sexp, rsa->key); + if (gcry_err_code(err) != 0) { + goto clear; + } + + /* S-expression of signature: (sig-val (rsa (s s-mpi))) */ + sig_sexp_item = gcry_sexp_find_token(sig_sexp, "s", 0); + if (!sig_sexp_item || gcry_sexp_length(sig_sexp_item) != 2) { + goto clear; + } + + result = gcry_sexp_nth_data(sig_sexp_item, 1, &actual_len); + if (!result || actual_len > out_len) { + goto clear; + } + memcpy(out, result, actual_len); + ret = actual_len; + +clear: + 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 = + container_of(akcipher, 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 || + in2_len > akcipher->max_dgst_len) { + error_setg(errp, "Invalid buffer size"); + 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) { + goto clear; + } + + 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) { + goto clear; + } + + err = gcry_pk_verify(sig_sexp, dgst_sexp, rsa->key); + if (gcry_err_code(err) == 0) { + ret = 0; + } + +clear: + gcry_sexp_release(dgst_sexp); + gcry_sexp_release(sig_sexp); + + return ret; +} + +static int qcrypto_gcrypt_rsa_free(QCryptoAkCipher *akcipher, + Error **errp) +{ + qcrypto_gcrypt_rsa_destroy((QCryptoGcryptRSA *)akcipher); + return 0; +} + +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) != 0) { + error_setg(errp, "Failed to parse rsa private key"); + goto err; + } + break; + + case QCRYPTO_AKCIPHER_KEY_TYPE_PUBLIC: + if (qcrypto_gcrypt_parse_rsa_public_key(rsa, key, keylen) != 0) { + error_setg(errp, "Failed to parse rsa public rsa key"); + goto err; + } + break; + + default: + error_setg(errp, "Unknown akcipher key type %d", type); + } + + return rsa; + +err: + qcrypto_gcrypt_rsa_destroy(rsa); + return NULL; +} + + +bool qcrypto_akcipher_supports(QCryptoAkCipherOptions *opts) +{ + switch (opts->algorithm) { + 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; + } +} diff --git a/crypto/akcipher.c b/crypto/akcipher.c index dc29127bb4..5c60d54565 100644 --- a/crypto/akcipher.c +++ b/crypto/akcipher.c @@ -23,7 +23,9 @@ #include "crypto/akcipher.h" #include "akcipherpriv.h" -#if defined(CONFIG_NETTLE) && defined(CONFIG_HOGWEED) +#if defined(CONFIG_GCRYPT) +#include "akcipher-gcrypt.c.inc" +#elif defined(CONFIG_NETTLE) && defined(CONFIG_HOGWEED) #include "akcipher-nettle.c.inc" #else QCryptoAkCipher *qcrypto_akcipher_new(const QCryptoAkCipherOptions *opts, -- 2.20.1
