From: Lei He <helei.si...@bytedance.com> Implement RSA algorithm by nettle hogweed, and apply it for virtio-crypto akcipher backend.
1, The self-test framework of crypto layer works fine in guest kernel 2, Test with Linux guest(with asym support), the following script test(note that pkey_XXX is supported only in a newer version of keyutils): - both public key & private key - create/close session - encrypt/decrypt/sign/verify basic driver operation - also test with kernel crypto layer(pkey add/query) All the cases work fine. rm -rf *.der *.pem *.pfx modprobe pkcs8_key_parser # if CONFIG_PKCS8_PRIVATE_KEY_PARSER=m rm -rf /tmp/data dd if=/dev/random of=/tmp/data count=1 bs=226 openssl req -nodes -x509 -newkey rsa:2048 -keyout key.pem -out cert.pem -subj "/C=CN/ST=BJ/L=HD/O=qemu/OU=dev/CN=qemu/emailAddress=q...@qemu.org" openssl pkcs8 -in key.pem -topk8 -nocrypt -outform DER -out key.der openssl x509 -in cert.pem -inform PEM -outform DER -out cert.der PRIV_KEY_ID=`cat key.der | keyctl padd asymmetric test_priv_key @s` echo "priv key id = "$PRIV_KEY_ID PUB_KEY_ID=`cat cert.der | keyctl padd asymmetric test_pub_key @s` echo "pub key id = "$PUB_KEY_ID keyctl pkey_query $PRIV_KEY_ID 0 keyctl pkey_query $PUB_KEY_ID 0 echo "Enc with priv key..." keyctl pkey_encrypt $PRIV_KEY_ID 0 /tmp/data enc=pkcs1 >/tmp/enc.priv echo "Dec with pub key..." keyctl pkey_decrypt $PRIV_KEY_ID 0 /tmp/enc.priv enc=pkcs1 >/tmp/dec cmp /tmp/data /tmp/dec echo "Sign with priv key..." keyctl pkey_sign $PRIV_KEY_ID 0 /tmp/data enc=pkcs1 hash=sha1 > /tmp/sig echo "Verify with pub key..." keyctl pkey_verify $PRIV_KEY_ID 0 /tmp/data /tmp/sig enc=pkcs1 hash=sha1 echo "Enc with pub key..." keyctl pkey_encrypt $PUB_KEY_ID 0 /tmp/data enc=pkcs1 >/tmp/enc.pub echo "Dec with priv key..." keyctl pkey_decrypt $PRIV_KEY_ID 0 /tmp/enc.pub enc=pkcs1 >/tmp/dec cmp /tmp/data /tmp/dec echo "Verify with pub key..." keyctl pkey_verify $PUB_KEY_ID 0 /tmp/data /tmp/sig enc=pkcs1 hash=sha1 Signed-off-by: zhenwei pi <pizhen...@bytedance.com> Signed-off-by: lei he <helei.si...@bytedance.com> --- crypto/akcipher-nettle.c | 486 +++++++++++++++++++++++++++++++++++++++ crypto/akcipher.c | 13 ++ crypto/asn1_decoder.c | 185 +++++++++++++++ crypto/asn1_decoder.h | 42 ++++ crypto/meson.build | 3 + meson.build | 11 + 6 files changed, 740 insertions(+) create mode 100644 crypto/akcipher-nettle.c create mode 100644 crypto/asn1_decoder.c create mode 100644 crypto/asn1_decoder.h diff --git a/crypto/akcipher-nettle.c b/crypto/akcipher-nettle.c new file mode 100644 index 0000000000..6ac39e7abc --- /dev/null +++ b/crypto/akcipher-nettle.c @@ -0,0 +1,486 @@ +/* + * 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 <nettle/rsa.h> + +#include "asn1_decoder.h" +#include "crypto/akcipher.h" +#include "crypto/random.h" +#include "qemu/osdep.h" +#include "qapi/error.h" +#include "sysemu/cryptodev.h" +#include "standard-headers/linux/virtio_crypto.h" + +typedef struct QCryptoNettleRsa { + QCryptoAkcipher akcipher; + struct rsa_public_key pub; + struct rsa_private_key priv; + int padding_algo; + int hash_algo; +} QCryptoNettleRsa; + +struct asn1_parse_ctx { + const uint8_t *data; + size_t dlen; +}; + +static int extract_value(void *p, const uint8_t *data, size_t dlen) +{ + struct asn1_parse_ctx *ctx = (struct asn1_parse_ctx *)p; + ctx->data = (uint8_t *)data; + ctx->dlen = dlen; + + return 0; +} + +static int extract_mpi(void *p, const uint8_t *data, size_t dlen) +{ + mpz_t *target = (mpz_t *)p; + nettle_mpz_set_str_256_u(*target, dlen, data); + + return 0; +} + +static QCryptoNettleRsa *qcrypto_nettle_rsa_malloc(void); + +static void qcrypto_nettle_rsa_destroy(void *ptr) +{ + QCryptoNettleRsa *rsa = (QCryptoNettleRsa *)ptr; + if (!rsa) { + return; + } + + rsa_public_key_clear(&rsa->pub); + rsa_private_key_clear(&rsa->priv); + g_free(rsa); +} + +static QCryptoAkcipher *qcrypto_nettle_new_rsa(bool private, const uint8_t *key, + size_t keylen, void *para, + int index, Error **errp); + +QCryptoAkcipher *qcrypto_akcipher_nettle_new(uint32_t alg, bool private, + const uint8_t *key, + size_t keylen, void *para, + int index, Error **errp); + +QCryptoAkcipher *qcrypto_akcipher_nettle_new(uint32_t alg, bool private, + const uint8_t *key, + size_t keylen, void *para, + int index, Error **errp) +{ + switch (alg) { + case VIRTIO_CRYPTO_AKCIPHER_RSA: + return qcrypto_nettle_new_rsa(private, key, keylen, para, index, errp); + default: + error_setg(errp, "Unsupported algorithm: %u", alg); + return NULL; + } + + return NULL; +} + +/* + * Parse ber encoded rsa private key, asn1 schema: + * RsaPrivKey ::= SEQUENCE { + * version INTEGER + * n INTEGER + * e INTEGER + * d INTEGER + * p INTEGER + * q INTEGER + * e1 INTEGER + * e2 INTEGER + * u INTEGER + * } + */ +static int parse_rsa_private_key(QCryptoNettleRsa *rsa, + const uint8_t *key, size_t keylen) +{ + struct asn1_parse_ctx ctx; + + if (ber_decode_seq(&key, &keylen, extract_value, &ctx) != 0 || + keylen != 0) { + return -1; + } + + if (ber_decode_int(&ctx.data, &ctx.dlen, NULL, NULL) != 0 || + ber_decode_int(&ctx.data, &ctx.dlen, extract_mpi, &rsa->pub.n) != 0 || + ber_decode_int(&ctx.data, &ctx.dlen, extract_mpi, &rsa->pub.e) != 0 || + ber_decode_int(&ctx.data, &ctx.dlen, extract_mpi, &rsa->priv.d) != 0 || + ber_decode_int(&ctx.data, &ctx.dlen, extract_mpi, &rsa->priv.p) != 0 || + ber_decode_int(&ctx.data, &ctx.dlen, extract_mpi, &rsa->priv.q) != 0 || + ber_decode_int(&ctx.data, &ctx.dlen, extract_mpi, &rsa->priv.a) != 0 || + ber_decode_int(&ctx.data, &ctx.dlen, extract_mpi, &rsa->priv.b) != 0 || + ber_decode_int(&ctx.data, &ctx.dlen, extract_mpi, &rsa->priv.c) != 0 || + ctx.dlen != 0) { + return -1; + } + + 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 + */ + rsa->priv.size = rsa->pub.size; + + return 0; +} + +/* + * Parse ber encoded rsa pubkey, asn1 schema: + * RsaPrivKey ::= SEQUENCE { + * n INTEGER + * e INTEGER + * } + */ +static int parse_rsa_public_key(QCryptoNettleRsa *rsa, + const uint8_t *key, + size_t keylen) +{ + struct asn1_parse_ctx ctx; + + if (ber_decode_seq(&key, &keylen, extract_value, &ctx) != 0 || + keylen != 0) { + return -1; + } + + if (ber_decode_int(&ctx.data, &ctx.dlen, extract_mpi, &rsa->pub.n) != 0 || + ber_decode_int(&ctx.data, &ctx.dlen, extract_mpi, &rsa->pub.e) != 0 || + ctx.dlen != 0) { + return -1; + } + + if (!rsa_public_key_prepare(&rsa->pub)) { + return -1; + } + + return 0; +} + +static QCryptoAkcipher *qcrypto_nettle_new_rsa(bool private, const uint8_t *key, + size_t keylen, void *para, + int index, Error **errp) +{ + QCryptoNettleRsa *rsa = qcrypto_nettle_rsa_malloc(); + CryptoDevBackendRsaPara *p = (CryptoDevBackendRsaPara *)para; + rsa->padding_algo = p->padding_algo; + rsa->hash_algo = p->hash_algo; + + if (private && parse_rsa_private_key(rsa, key, keylen) == 0) { + return (QCryptoAkcipher *)rsa; + } else if (!private && parse_rsa_public_key(rsa, key, keylen) == 0) { + return (QCryptoAkcipher *)rsa; + } + + qcrypto_nettle_rsa_destroy(rsa); + error_setg(errp, "Failed to parse %s key", private ? "private" : "public"); + + return NULL; +} + + +/* + * nettle does not provide RSA interfaces without padding, + * here we implemented rsa algorithm with nettle/mpz. + */ +static int _rsa_enc_raw(QCryptoNettleRsa *rsa, const void *data, + size_t data_len, void *enc, + size_t enc_len, Error **errp) +{ + mpz_t m; + + nettle_mpz_init_set_str_256_u(m, data_len, data); + /* (1) Validate 0 <= m < n */ + if (mpz_cmp_ui(m, 0) < 0 || mpz_cmp(m, rsa->pub.n) >= 0) { + error_setg(errp, "Failed to validate input data"); + return -VIRTIO_CRYPTO_BADMSG; + } + + /* (2) c = m ^ e mod n */ + mpz_powm(m, m, rsa->pub.e, rsa->pub.n); + nettle_mpz_get_str_256(enc_len, (uint8_t *)enc, m); + + mpz_clear(m); + + return 0; +} + +static int _rsa_dec_raw(QCryptoNettleRsa *rsa, + const void *enc, + size_t enc_len, + void *data, + size_t data_len, + Error **errp) +{ + mpz_t c; + nettle_mpz_init_set_str_256_u(c, enc_len, enc); + + /* (1) Validate 0 <= c < n */ + if (mpz_cmp_ui(c, 0) < 0 || mpz_cmp(c, rsa->pub.n) >= 0) { + error_setg(errp, "Failed to validate input data"); + return -VIRTIO_CRYPTO_BADMSG; + } + + /* (2) m = c ^ d mod n */ + mpz_powm(c, c, rsa->priv.d, rsa->pub.n); + nettle_mpz_get_str_256(data_len, (uint8_t *)data, c); + mpz_clear(c); + + 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_driver, + const void *data, size_t data_len, + void *enc, size_t enc_len, + Error **errp) +{ + + QCryptoNettleRsa *rsa = + container_of(akcipher_driver, QCryptoNettleRsa, akcipher); + mpz_t c; + int enc_ret; + + if (data_len > rsa->pub.size || enc_len < rsa->pub.size) { + error_setg(errp, "Invalid buffer size"); + return -VIRTIO_CRYPTO_BADMSG; + } + + switch (rsa->padding_algo) { + case VIRTIO_CRYPTO_RSA_RAW_PADDING: + return _rsa_enc_raw(rsa, data, data_len, enc, enc_len, errp); + + case VIRTIO_CRYPTO_RSA_PKCS1_PADDING: + mpz_init(c); + enc_ret = rsa_encrypt(&rsa->pub, NULL, wrap_nettle_random_func, + data_len, (uint8_t *)data, c); + if (enc_ret != 1) { + error_setg(errp, "Failed to encrypt"); + } else { + nettle_mpz_get_str_256(enc_len, (uint8_t *)enc, c); + } + mpz_clear(c); + return enc_ret == 1 ? 0 : -1; + + default: + error_setg(errp, "Unknown padding"); + return -VIRTIO_CRYPTO_NOTSUPP; + } + + return -1; +} + +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 = container_of(akcipher, QCryptoNettleRsa, akcipher); + mpz_t m; + int dec_ret; + + if (enc_len > rsa->priv.size || data_len < rsa->priv.size) { + error_setg(errp, "Invalid buffer size"); + return -VIRTIO_CRYPTO_BADMSG; + } + + switch (rsa->padding_algo) { + case VIRTIO_CRYPTO_RSA_RAW_PADDING: + return _rsa_dec_raw(rsa, enc, enc_len, data, data_len, errp); + + case VIRTIO_CRYPTO_RSA_PKCS1_PADDING: + mpz_init(m); + dec_ret = rsa_encrypt(&rsa->pub, NULL, wrap_nettle_random_func, + data_len, (uint8_t *)data, m); + if (dec_ret != 1) { + error_setg(errp, "Failed to encrypt"); + } else { + nettle_mpz_get_str_256(data_len, (uint8_t *)data_len, m); + } + mpz_clear(m); + return dec_ret == 1 ? 0 : -1; + + default: + error_setg(errp, "Unknown padding"); + return -VIRTIO_CRYPTO_NOTSUPP; + } + + return -1; +} + + +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 = container_of(akcipher, QCryptoNettleRsa, akcipher); + int ret; + mpz_t s; + + /* + * The RSA algorithm cannot be used for signature/verification + * without padding. + */ + if (rsa->padding_algo == VIRTIO_CRYPTO_RSA_RAW_PADDING) { + error_setg(errp, "Try to make signature without padding"); + return -VIRTIO_CRYPTO_NOTSUPP; + } + + if (data_len > rsa->priv.size || sig_len < rsa->priv.size) { + error_setg(errp, "Invalid buffer size"); + return -VIRTIO_CRYPTO_BADMSG; + } + + mpz_init(s); + switch (rsa->hash_algo) { + case VIRTIO_CRYPTO_RSA_MD5: + ret = rsa_md5_sign_digest(&rsa->priv, data, s); + break; + + case VIRTIO_CRYPTO_RSA_SHA1: + ret = rsa_sha1_sign_digest(&rsa->priv, data, s); + break; + + case VIRTIO_CRYPTO_RSA_SHA256: + ret = rsa_sha256_sign_digest(&rsa->priv, data, s); + break; + + case VIRTIO_CRYPTO_RSA_SHA512: + ret = rsa_sha512_sign_digest(&rsa->priv, data, s); + break; + + default: + error_setg(errp, "Unknown hash algorithm"); + ret = -VIRTIO_CRYPTO_NOTSUPP; + goto clear; + } + + if (ret != 1) { + error_setg(errp, "Failed to make signature"); + ret = -VIRTIO_CRYPTO_BADMSG; + goto clear; + } + nettle_mpz_get_str_256(sig_len, (uint8_t *)sig, s); + ret = 0; + +clear: + 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 = container_of(akcipher, QCryptoNettleRsa, akcipher); + + int ret; + mpz_t s; + + /* + * The RSA algorithm cannot be used for signature/verification + * without padding. + */ + if (rsa->padding_algo == VIRTIO_CRYPTO_RSA_RAW_PADDING) { + 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_algo) { + case VIRTIO_CRYPTO_RSA_MD5: + ret = rsa_md5_verify_digest(&rsa->pub, data, s); + break; + + case VIRTIO_CRYPTO_RSA_SHA1: + ret = rsa_sha1_verify_digest(&rsa->pub, data, s); + break; + + case VIRTIO_CRYPTO_RSA_SHA256: + ret = rsa_sha256_verify_digest(&rsa->pub, data, s); + break; + + case VIRTIO_CRYPTO_RSA_SHA512: + ret = rsa_sha512_verify_digest(&rsa->pub, data, s); + break; + + default: + error_setg(errp, "Unknown hash algorithm"); + ret = -VIRTIO_CRYPTO_NOTSUPP; + goto clear; + } + + if (ret != 1) { + error_setg(errp, "Failed to verify"); + ret = -VIRTIO_CRYPTO_KEY_REJECTED; + goto clear; + } + ret = 0; + +clear: + mpz_clear(s); + + return ret; +} + +static int qcrypto_nettle_rsa_free(struct QCryptoAkcipher *akcipher, + Error **errp) +{ + qcrypto_nettle_rsa_destroy(akcipher); + + return 0; +} + +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 QCryptoNettleRsa *qcrypto_nettle_rsa_malloc(void) +{ + QCryptoNettleRsa *rsa = g_malloc0(sizeof(QCryptoNettleRsa)); + memset(rsa, 0, sizeof(QCryptoNettleRsa)); + rsa->akcipher.driver = &nettle_rsa; + rsa_public_key_init(&rsa->pub); + rsa_private_key_init(&rsa->priv); + + return rsa; +} diff --git a/crypto/akcipher.c b/crypto/akcipher.c index ac8d1c9bf1..f5bdc35e18 100644 --- a/crypto/akcipher.c +++ b/crypto/akcipher.c @@ -24,6 +24,12 @@ #include "qapi/error.h" #include "crypto/akcipher.h" +QCryptoAkcipher *qcrypto_akcipher_nettle_new(uint32_t alg, bool private, + const uint8_t *key, + size_t keylen, + void *para, + int index, Error **errp); + QCryptoAkcipher *qcrypto_akcipher_new(uint32_t alg, bool private, const uint8_t *key, size_t keylen, void *para, @@ -31,6 +37,13 @@ QCryptoAkcipher *qcrypto_akcipher_new(uint32_t alg, bool private, { QCryptoAkcipher *akcipher = NULL; +#ifdef CONFIG_HOGWEED + akcipher = qcrypto_akcipher_nettle_new(alg, private, key, keylen, + para, index, errp); +#else + error_setg(errp, "qcrypto akcipher has no nettle/hogweed support"); +#endif + return akcipher; } diff --git a/crypto/asn1_decoder.c b/crypto/asn1_decoder.c new file mode 100644 index 0000000000..bfb145e84e --- /dev/null +++ b/crypto/asn1_decoder.c @@ -0,0 +1,185 @@ +/* + * 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 <stdint.h> +#include <stddef.h> + +#include "crypto/asn1_decoder.h" + +enum ber_type_tag { + ber_type_tag_bool = 0x1, + ber_type_tag_int = 0x2, + ber_type_tag_bit_str = 0x3, + ber_type_tag_oct_str = 0x4, + ber_type_tag_oct_null = 0x5, + ber_type_tag_oct_oid = 0x6, + ber_type_tag_seq = 0x10, + ber_type_tag_set = 0x11, +}; + +#define BER_CONSTRUCTED_MASK 0x20 +#define BER_SHORT_LEN_MASK 0x80 + +static uint8_t ber_peek_byte(const uint8_t **data, size_t *dlen) +{ + return **data; +} + +static int invoke_callback(BerDecodeCb cb, void *ctx, + const uint8_t *value, size_t vlen) +{ + if (!cb) { + return 0; + } + + return cb(ctx, value, vlen); +} + +static void ber_cut_nbytes(const uint8_t **data, size_t *dlen, + size_t nbytes) +{ + *data += nbytes; + *dlen -= nbytes; +} + +static uint8_t ber_cut_byte(const uint8_t **data, size_t *dlen) +{ + uint8_t val = ber_peek_byte(data, dlen); + + ber_cut_nbytes(data, dlen, 1); + + return val; +} + +static int ber_extract_definite_data(const uint8_t **data, size_t *dlen, + BerDecodeCb cb, void *ctx) +{ + const uint8_t *value; + size_t vlen = 0; + uint8_t byte_count = ber_cut_byte(data, dlen); + + /* short format of definite-length */ + if (!(byte_count & BER_SHORT_LEN_MASK)) { + if (byte_count > *dlen) { + return -1; + } + + value = *data; + vlen = byte_count; + ber_cut_nbytes(data, dlen, vlen); + + return invoke_callback(cb, ctx, value, vlen); + } + + /* Ignore highest bit */ + byte_count &= ~BER_SHORT_LEN_MASK; + + /* + * size_t is enough to express the length, although the ber encoding + * standard supports larger length. + */ + if (byte_count > sizeof(size_t)) { + return -1; + } + + while (byte_count--) { + vlen <<= 8; + vlen += ber_cut_byte(data, dlen); + } + + if (vlen > *dlen) { + return -1; + } + + value = *data; + ber_cut_nbytes(data, dlen, vlen); + + return invoke_callback(cb, ctx, value, vlen); +} + +static int ber_extract_undefinite_data(const uint8_t **data, size_t *dlen, + BerDecodeCb cb, void *ctx) +{ + size_t vlen = 0; + const uint8_t *value; + + if (*dlen < 3) { + return -1; + } + + /* skip undefinite-length-mask 0x80 */ + ber_cut_nbytes(data, dlen, 1); + + value = *data; + while (vlen < *dlen) { + if ((*data)[vlen] != 0) { + vlen++; + continue; + } + + if (vlen + 1 < *dlen && (*data[vlen + 1] == 0)) { + ber_cut_nbytes(data, dlen, vlen + 2); + return invoke_callback(cb, ctx, value, vlen); + } + + vlen += 2; + } + + return -1; +} + +static int ber_extract_data(const uint8_t **data, size_t *dlen, + BerDecodeCb cb, void *ctx) +{ + uint8_t val = ber_peek_byte(data, dlen); + + if (val == BER_SHORT_LEN_MASK) { + return ber_extract_undefinite_data(data, dlen, cb, ctx); + } + + return ber_extract_definite_data(data, dlen, cb, ctx); +} + +int ber_decode_int(const uint8_t **data, size_t *dlen, + BerDecodeCb cb, void *ctx) +{ + uint8_t tag = ber_cut_byte(data, dlen); + + /* INTEGER must encoded in primitive-form */ + if (tag != ber_type_tag_int) { + return -1; + } + + return ber_extract_data(data, dlen, cb, ctx); +} + +int ber_decode_seq(const uint8_t **data, size_t *dlen, + BerDecodeCb cb, void *ctx) +{ + uint8_t val = ber_cut_byte(data, dlen); + + /* SEQUENCE must use constructed form */ + if (val != (ber_type_tag_seq | BER_CONSTRUCTED_MASK)) { + return -1; + } + + return ber_extract_data(data, dlen, cb, ctx); +} diff --git a/crypto/asn1_decoder.h b/crypto/asn1_decoder.h new file mode 100644 index 0000000000..d33a7c81c4 --- /dev/null +++ b/crypto/asn1_decoder.h @@ -0,0 +1,42 @@ +/* + * 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/>. + * + */ + +#ifndef QCRYPTO_ASN1_DECODER_H +#define QCRYPTO_ASN1_DECODER_H + +/* + * ctx: user content. + * value: the starting address of |value| part of 'Tag-Length-Value' pattern. + * vlen: length of the |value|. + */ +typedef int (*BerDecodeCb) (void *ctx, const uint8_t *value, size_t vlen); + +int ber_decode_int(const uint8_t **data, + size_t *dlen, + BerDecodeCb cb, + void *ctx); + +int ber_decode_seq(const uint8_t **data, + size_t *dlen, + BerDecodeCb cb, + void *ctx); + +#endif /* QCRYPTO_ASN1_DECODER_H */ diff --git a/crypto/meson.build b/crypto/meson.build index 72b36f450a..28d14cb153 100644 --- a/crypto/meson.build +++ b/crypto/meson.build @@ -27,6 +27,9 @@ if nettle.found() if xts == 'private' crypto_ss.add(files('xts.c')) endif + if hogweed.found() + crypto_ss.add(gmp, hogweed, files('akcipher-nettle.c', 'asn1_decoder.c')) + endif elif gcrypt.found() crypto_ss.add(gcrypt, files('hash-gcrypt.c', 'hmac-gcrypt.c', 'pbkdf-gcrypt.c')) elif gnutls_crypto.found() diff --git a/meson.build b/meson.build index 5f43355071..fdc7ffabef 100644 --- a/meson.build +++ b/meson.build @@ -1027,6 +1027,7 @@ 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() @@ -1064,6 +1065,14 @@ 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 @@ -1516,6 +1525,7 @@ 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) @@ -3413,6 +3423,7 @@ summary_info += {'libgcrypt': gcrypt} summary_info += {'nettle': nettle} if nettle.found() summary_info += {' XTS': xts != 'private'} + summary_info += {' hogweed': hogweed.found()} endif summary_info += {'crypto afalg': config_host.has_key('CONFIG_AF_ALG')} summary_info += {'rng-none': config_host.has_key('CONFIG_RNG_NONE')} -- 2.20.1
