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-rw-r--r--crypto/sm2.c498
1 files changed, 498 insertions, 0 deletions
diff --git a/crypto/sm2.c b/crypto/sm2.c
new file mode 100644
index 0000000000..5ab120d74c
--- /dev/null
+++ b/crypto/sm2.c
@@ -0,0 +1,498 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * SM2 asymmetric public-key algorithm
+ * as specified by OSCCA GM/T 0003.1-2012 -- 0003.5-2012 SM2 and
+ * described at https://tools.ietf.org/html/draft-shen-sm2-ecdsa-02
+ *
+ * Copyright (c) 2020, Alibaba Group.
+ * Authors: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
+ */
+
+#include <linux/module.h>
+#include <linux/mpi.h>
+#include <crypto/internal/akcipher.h>
+#include <crypto/akcipher.h>
+#include <crypto/hash.h>
+#include <crypto/rng.h>
+#include <crypto/sm2.h>
+#include "sm2signature.asn1.h"
+
+/* The default user id as specified in GM/T 0009-2012 */
+#define SM2_DEFAULT_USERID "1234567812345678"
+#define SM2_DEFAULT_USERID_LEN 16
+
+#define MPI_NBYTES(m) ((mpi_get_nbits(m) + 7) / 8)
+
+struct ecc_domain_parms {
+ const char *desc; /* Description of the curve. */
+ unsigned int nbits; /* Number of bits. */
+ unsigned int fips:1; /* True if this is a FIPS140-2 approved curve */
+
+ /* The model describing this curve. This is mainly used to select
+ * the group equation.
+ */
+ enum gcry_mpi_ec_models model;
+
+ /* The actual ECC dialect used. This is used for curve specific
+ * optimizations and to select encodings etc.
+ */
+ enum ecc_dialects dialect;
+
+ const char *p; /* The prime defining the field. */
+ const char *a, *b; /* The coefficients. For Twisted Edwards
+ * Curves b is used for d. For Montgomery
+ * Curves (a,b) has ((A-2)/4,B^-1).
+ */
+ const char *n; /* The order of the base point. */
+ const char *g_x, *g_y; /* Base point. */
+ unsigned int h; /* Cofactor. */
+};
+
+static const struct ecc_domain_parms sm2_ecp = {
+ .desc = "sm2p256v1",
+ .nbits = 256,
+ .fips = 0,
+ .model = MPI_EC_WEIERSTRASS,
+ .dialect = ECC_DIALECT_STANDARD,
+ .p = "0xfffffffeffffffffffffffffffffffffffffffff00000000ffffffffffffffff",
+ .a = "0xfffffffeffffffffffffffffffffffffffffffff00000000fffffffffffffffc",
+ .b = "0x28e9fa9e9d9f5e344d5a9e4bcf6509a7f39789f515ab8f92ddbcbd414d940e93",
+ .n = "0xfffffffeffffffffffffffffffffffff7203df6b21c6052b53bbf40939d54123",
+ .g_x = "0x32c4ae2c1f1981195f9904466a39c9948fe30bbff2660be1715a4589334c74c7",
+ .g_y = "0xbc3736a2f4f6779c59bdcee36b692153d0a9877cc62a474002df32e52139f0a0",
+ .h = 1
+};
+
+static int __sm2_set_pub_key(struct mpi_ec_ctx *ec,
+ const void *key, unsigned int keylen);
+
+static int sm2_ec_ctx_init(struct mpi_ec_ctx *ec)
+{
+ const struct ecc_domain_parms *ecp = &sm2_ecp;
+ MPI p, a, b;
+ MPI x, y;
+ int rc = -EINVAL;
+
+ p = mpi_scanval(ecp->p);
+ a = mpi_scanval(ecp->a);
+ b = mpi_scanval(ecp->b);
+ if (!p || !a || !b)
+ goto free_p;
+
+ x = mpi_scanval(ecp->g_x);
+ y = mpi_scanval(ecp->g_y);
+ if (!x || !y)
+ goto free;
+
+ rc = -ENOMEM;
+
+ ec->Q = mpi_point_new(0);
+ if (!ec->Q)
+ goto free;
+
+ /* mpi_ec_setup_elliptic_curve */
+ ec->G = mpi_point_new(0);
+ if (!ec->G) {
+ mpi_point_release(ec->Q);
+ goto free;
+ }
+
+ mpi_set(ec->G->x, x);
+ mpi_set(ec->G->y, y);
+ mpi_set_ui(ec->G->z, 1);
+
+ rc = -EINVAL;
+ ec->n = mpi_scanval(ecp->n);
+ if (!ec->n) {
+ mpi_point_release(ec->Q);
+ mpi_point_release(ec->G);
+ goto free;
+ }
+
+ ec->h = ecp->h;
+ ec->name = ecp->desc;
+ mpi_ec_init(ec, ecp->model, ecp->dialect, 0, p, a, b);
+
+ rc = 0;
+
+free:
+ mpi_free(x);
+ mpi_free(y);
+free_p:
+ mpi_free(p);
+ mpi_free(a);
+ mpi_free(b);
+
+ return rc;
+}
+
+static void sm2_ec_ctx_deinit(struct mpi_ec_ctx *ec)
+{
+ mpi_ec_deinit(ec);
+
+ memset(ec, 0, sizeof(*ec));
+}
+
+/* RESULT must have been initialized and is set on success to the
+ * point given by VALUE.
+ */
+static int sm2_ecc_os2ec(MPI_POINT result, MPI value)
+{
+ int rc;
+ size_t n;
+ unsigned char *buf;
+ MPI x, y;
+
+ n = MPI_NBYTES(value);
+ buf = kmalloc(n, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ rc = mpi_print(GCRYMPI_FMT_USG, buf, n, &n, value);
+ if (rc)
+ goto err_freebuf;
+
+ rc = -EINVAL;
+ if (n < 1 || ((n - 1) % 2))
+ goto err_freebuf;
+ /* No support for point compression */
+ if (*buf != 0x4)
+ goto err_freebuf;
+
+ rc = -ENOMEM;
+ n = (n - 1) / 2;
+ x = mpi_read_raw_data(buf + 1, n);
+ if (!x)
+ goto err_freebuf;
+ y = mpi_read_raw_data(buf + 1 + n, n);
+ if (!y)
+ goto err_freex;
+
+ mpi_normalize(x);
+ mpi_normalize(y);
+ mpi_set(result->x, x);
+ mpi_set(result->y, y);
+ mpi_set_ui(result->z, 1);
+
+ rc = 0;
+
+ mpi_free(y);
+err_freex:
+ mpi_free(x);
+err_freebuf:
+ kfree(buf);
+ return rc;
+}
+
+struct sm2_signature_ctx {
+ MPI sig_r;
+ MPI sig_s;
+};
+
+int sm2_get_signature_r(void *context, size_t hdrlen, unsigned char tag,
+ const void *value, size_t vlen)
+{
+ struct sm2_signature_ctx *sig = context;
+
+ if (!value || !vlen)
+ return -EINVAL;
+
+ sig->sig_r = mpi_read_raw_data(value, vlen);
+ if (!sig->sig_r)
+ return -ENOMEM;
+
+ return 0;
+}
+
+int sm2_get_signature_s(void *context, size_t hdrlen, unsigned char tag,
+ const void *value, size_t vlen)
+{
+ struct sm2_signature_ctx *sig = context;
+
+ if (!value || !vlen)
+ return -EINVAL;
+
+ sig->sig_s = mpi_read_raw_data(value, vlen);
+ if (!sig->sig_s)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static int sm2_z_digest_update(struct shash_desc *desc,
+ MPI m, unsigned int pbytes)
+{
+ static const unsigned char zero[32];
+ unsigned char *in;
+ unsigned int inlen;
+ int err;
+
+ in = mpi_get_buffer(m, &inlen, NULL);
+ if (!in)
+ return -EINVAL;
+
+ if (inlen < pbytes) {
+ /* padding with zero */
+ err = crypto_shash_update(desc, zero, pbytes - inlen) ?:
+ crypto_shash_update(desc, in, inlen);
+ } else if (inlen > pbytes) {
+ /* skip the starting zero */
+ err = crypto_shash_update(desc, in + inlen - pbytes, pbytes);
+ } else {
+ err = crypto_shash_update(desc, in, inlen);
+ }
+
+ kfree(in);
+ return err;
+}
+
+static int sm2_z_digest_update_point(struct shash_desc *desc,
+ MPI_POINT point, struct mpi_ec_ctx *ec,
+ unsigned int pbytes)
+{
+ MPI x, y;
+ int ret = -EINVAL;
+
+ x = mpi_new(0);
+ y = mpi_new(0);
+
+ ret = mpi_ec_get_affine(x, y, point, ec) ? -EINVAL :
+ sm2_z_digest_update(desc, x, pbytes) ?:
+ sm2_z_digest_update(desc, y, pbytes);
+
+ mpi_free(x);
+ mpi_free(y);
+ return ret;
+}
+
+int sm2_compute_z_digest(struct shash_desc *desc,
+ const void *key, unsigned int keylen, void *dgst)
+{
+ struct mpi_ec_ctx *ec;
+ unsigned int bits_len;
+ unsigned int pbytes;
+ u8 entl[2];
+ int err;
+
+ ec = kmalloc(sizeof(*ec), GFP_KERNEL);
+ if (!ec)
+ return -ENOMEM;
+
+ err = sm2_ec_ctx_init(ec);
+ if (err)
+ goto out_free_ec;
+
+ err = __sm2_set_pub_key(ec, key, keylen);
+ if (err)
+ goto out_deinit_ec;
+
+ bits_len = SM2_DEFAULT_USERID_LEN * 8;
+ entl[0] = bits_len >> 8;
+ entl[1] = bits_len & 0xff;
+
+ pbytes = MPI_NBYTES(ec->p);
+
+ /* ZA = H256(ENTLA | IDA | a | b | xG | yG | xA | yA) */
+ err = crypto_shash_init(desc);
+ if (err)
+ goto out_deinit_ec;
+
+ err = crypto_shash_update(desc, entl, 2);
+ if (err)
+ goto out_deinit_ec;
+
+ err = crypto_shash_update(desc, SM2_DEFAULT_USERID,
+ SM2_DEFAULT_USERID_LEN);
+ if (err)
+ goto out_deinit_ec;
+
+ err = sm2_z_digest_update(desc, ec->a, pbytes) ?:
+ sm2_z_digest_update(desc, ec->b, pbytes) ?:
+ sm2_z_digest_update_point(desc, ec->G, ec, pbytes) ?:
+ sm2_z_digest_update_point(desc, ec->Q, ec, pbytes);
+ if (err)
+ goto out_deinit_ec;
+
+ err = crypto_shash_final(desc, dgst);
+
+out_deinit_ec:
+ sm2_ec_ctx_deinit(ec);
+out_free_ec:
+ kfree(ec);
+ return err;
+}
+EXPORT_SYMBOL_GPL(sm2_compute_z_digest);
+
+static int _sm2_verify(struct mpi_ec_ctx *ec, MPI hash, MPI sig_r, MPI sig_s)
+{
+ int rc = -EINVAL;
+ struct gcry_mpi_point sG, tP;
+ MPI t = NULL;
+ MPI x1 = NULL, y1 = NULL;
+
+ mpi_point_init(&sG);
+ mpi_point_init(&tP);
+ x1 = mpi_new(0);
+ y1 = mpi_new(0);
+ t = mpi_new(0);
+
+ /* r, s in [1, n-1] */
+ if (mpi_cmp_ui(sig_r, 1) < 0 || mpi_cmp(sig_r, ec->n) > 0 ||
+ mpi_cmp_ui(sig_s, 1) < 0 || mpi_cmp(sig_s, ec->n) > 0) {
+ goto leave;
+ }
+
+ /* t = (r + s) % n, t == 0 */
+ mpi_addm(t, sig_r, sig_s, ec->n);
+ if (mpi_cmp_ui(t, 0) == 0)
+ goto leave;
+
+ /* sG + tP = (x1, y1) */
+ rc = -EBADMSG;
+ mpi_ec_mul_point(&sG, sig_s, ec->G, ec);
+ mpi_ec_mul_point(&tP, t, ec->Q, ec);
+ mpi_ec_add_points(&sG, &sG, &tP, ec);
+ if (mpi_ec_get_affine(x1, y1, &sG, ec))
+ goto leave;
+
+ /* R = (e + x1) % n */
+ mpi_addm(t, hash, x1, ec->n);
+
+ /* check R == r */
+ rc = -EKEYREJECTED;
+ if (mpi_cmp(t, sig_r))
+ goto leave;
+
+ rc = 0;
+
+leave:
+ mpi_point_free_parts(&sG);
+ mpi_point_free_parts(&tP);
+ mpi_free(x1);
+ mpi_free(y1);
+ mpi_free(t);
+
+ return rc;
+}
+
+static int sm2_verify(struct akcipher_request *req)
+{
+ struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+ struct mpi_ec_ctx *ec = akcipher_tfm_ctx(tfm);
+ unsigned char *buffer;
+ struct sm2_signature_ctx sig;
+ MPI hash;
+ int ret;
+
+ if (unlikely(!ec->Q))
+ return -EINVAL;
+
+ buffer = kmalloc(req->src_len + req->dst_len, GFP_KERNEL);
+ if (!buffer)
+ return -ENOMEM;
+
+ sg_pcopy_to_buffer(req->src,
+ sg_nents_for_len(req->src, req->src_len + req->dst_len),
+ buffer, req->src_len + req->dst_len, 0);
+
+ sig.sig_r = NULL;
+ sig.sig_s = NULL;
+ ret = asn1_ber_decoder(&sm2signature_decoder, &sig,
+ buffer, req->src_len);
+ if (ret)
+ goto error;
+
+ ret = -ENOMEM;
+ hash = mpi_read_raw_data(buffer + req->src_len, req->dst_len);
+ if (!hash)
+ goto error;
+
+ ret = _sm2_verify(ec, hash, sig.sig_r, sig.sig_s);
+
+ mpi_free(hash);
+error:
+ mpi_free(sig.sig_r);
+ mpi_free(sig.sig_s);
+ kfree(buffer);
+ return ret;
+}
+
+static int sm2_set_pub_key(struct crypto_akcipher *tfm,
+ const void *key, unsigned int keylen)
+{
+ struct mpi_ec_ctx *ec = akcipher_tfm_ctx(tfm);
+
+ return __sm2_set_pub_key(ec, key, keylen);
+
+}
+
+static int __sm2_set_pub_key(struct mpi_ec_ctx *ec,
+ const void *key, unsigned int keylen)
+{
+ MPI a;
+ int rc;
+
+ /* include the uncompressed flag '0x04' */
+ a = mpi_read_raw_data(key, keylen);
+ if (!a)
+ return -ENOMEM;
+
+ mpi_normalize(a);
+ rc = sm2_ecc_os2ec(ec->Q, a);
+ mpi_free(a);
+
+ return rc;
+}
+
+static unsigned int sm2_max_size(struct crypto_akcipher *tfm)
+{
+ /* Unlimited max size */
+ return PAGE_SIZE;
+}
+
+static int sm2_init_tfm(struct crypto_akcipher *tfm)
+{
+ struct mpi_ec_ctx *ec = akcipher_tfm_ctx(tfm);
+
+ return sm2_ec_ctx_init(ec);
+}
+
+static void sm2_exit_tfm(struct crypto_akcipher *tfm)
+{
+ struct mpi_ec_ctx *ec = akcipher_tfm_ctx(tfm);
+
+ sm2_ec_ctx_deinit(ec);
+}
+
+static struct akcipher_alg sm2 = {
+ .verify = sm2_verify,
+ .set_pub_key = sm2_set_pub_key,
+ .max_size = sm2_max_size,
+ .init = sm2_init_tfm,
+ .exit = sm2_exit_tfm,
+ .base = {
+ .cra_name = "sm2",
+ .cra_driver_name = "sm2-generic",
+ .cra_priority = 100,
+ .cra_module = THIS_MODULE,
+ .cra_ctxsize = sizeof(struct mpi_ec_ctx),
+ },
+};
+
+static int __init sm2_init(void)
+{
+ return crypto_register_akcipher(&sm2);
+}
+
+static void __exit sm2_exit(void)
+{
+ crypto_unregister_akcipher(&sm2);
+}
+
+subsys_initcall(sm2_init);
+module_exit(sm2_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Tianjia Zhang <tianjia.zhang@linux.alibaba.com>");
+MODULE_DESCRIPTION("SM2 generic algorithm");
+MODULE_ALIAS_CRYPTO("sm2-generic");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-14 08:39:54 +0000