[PATCH 3/7] crypto: sm2 - introduce OSCCA SM2 asymmetric cipher algorithm
From: Tianjia Zhang
Date: Sun Feb 16 2020 - 04:05:27 EST
This new module implement the SM2 public key algorithm. It was
published by State Encryption Management Bureau, China.
List of specifications for SM2 elliptic curve public key cryptography:
* GM/T 0003.1-2012
* GM/T 0003.2-2012
* GM/T 0003.3-2012
* GM/T 0003.4-2012
* GM/T 0003.5-2012
IETF: https://tools.ietf.org/html/draft-shen-sm2-ecdsa-02
oscca: http://www.oscca.gov.cn/sca/xxgk/2010-12/17/content_1002386.shtml
scctc: http://www.gmbz.org.cn/main/bzlb.html
Signed-off-by: Tianjia Zhang <tianjia.zhang@xxxxxxxxxxxxxxxxx>
---
crypto/Kconfig | 17 +
crypto/Makefile | 8 +
crypto/sm2.c | 1145 ++++++++++++++++++++++++++++++++++++++
crypto/sm2signature.asn1 | 4 +
include/crypto/sm2.h | 25 +
5 files changed, 1199 insertions(+)
create mode 100644 crypto/sm2.c
create mode 100644 crypto/sm2signature.asn1
create mode 100644 include/crypto/sm2.h
diff --git a/crypto/Kconfig b/crypto/Kconfig
index 5575d48473bd..4a58673c85dd 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -264,6 +264,23 @@ config CRYPTO_ECRDSA
standard algorithms (called GOST algorithms). Only signature verification
is implemented.
+config CRYPTO_SM2
+ tristate "SM2 algorithm"
+ select CRYPTO_SM3
+ select CRYPTO_AKCIPHER
+ select CRYPTO_MANAGER
+ select MPILIB
+ select ASN1
+ help
+ Generic implementation of the SM2 public key algorithm. It was
+ published by State Encryption Management Bureau, China.
+ as specified by OSCCA GM/T 0003.1-2012 -- 0003.5-2012.
+
+ References:
+ https://tools.ietf.org/html/draft-shen-sm2-ecdsa-02
+ http://www.oscca.gov.cn/sca/xxgk/2010-12/17/content_1002386.shtml
+ http://www.gmbz.org.cn/main/bzlb.html
+
config CRYPTO_CURVE25519
tristate "Curve25519 algorithm"
select CRYPTO_KPP
diff --git a/crypto/Makefile b/crypto/Makefile
index 4ca12b6044f7..b279483fba50 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -42,6 +42,14 @@ rsa_generic-y += rsa_helper.o
rsa_generic-y += rsa-pkcs1pad.o
obj-$(CONFIG_CRYPTO_RSA) += rsa_generic.o
+$(obj)/sm2signature.asn1.o: $(obj)/sm2signature.asn1.c $(obj)/sm2signature.asn1.h
+$(obj)/sm2.o: $(obj)/sm2signature.asn1.h
+
+sm2_generic-y += sm2signature.asn1.o
+sm2_generic-y += sm2.o
+
+obj-$(CONFIG_CRYPTO_SM2) += sm2_generic.o
+
crypto_acompress-y := acompress.o
crypto_acompress-y += scompress.o
obj-$(CONFIG_CRYPTO_ACOMP2) += crypto_acompress.o
diff --git a/crypto/sm2.c b/crypto/sm2.c
new file mode 100644
index 000000000000..0410975554d1
--- /dev/null
+++ b/crypto/sm2.c
@@ -0,0 +1,1145 @@
+/* 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@xxxxxxxxxxxxxxxxx>
+ */
+
+#include <linux/module.h>
+#include <linux/mpi.h>
+#include <crypto/internal/akcipher.h>
+#include <crypto/akcipher.h>
+#include <crypto/hash.h>
+#include <crypto/sm3_base.h>
+#include <crypto/rng.h>
+#include <crypto/sm2.h>
+#include "sm2signature.asn1.h"
+
+#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_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;
+
+ /* mpi_ec_setup_elliptic_curve */
+ ec->G = mpi_point_new(0);
+ if (!ec->G)
+ goto free;
+
+ mpi_set(ec->G->x, x);
+ mpi_set(ec->G->y, y);
+ mpi_set_ui(ec->G->z, 1);
+
+ ec->n = mpi_scanval(ecp->n);
+ if (!ec->n) {
+ 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_free(ec->n);
+ mpi_point_release(ec->G);
+
+ mpi_ec_deinit(ec);
+
+ memset(ec, 0, sizeof(*ec));
+}
+
+static int sm2_ec_ctx_reset(struct mpi_ec_ctx *ec)
+{
+ sm2_ec_ctx_deinit(ec);
+ return sm2_ec_ctx_init(ec);
+}
+
+static unsigned char *sm2_ecc_ec2os(MPI x, MPI y, MPI p, unsigned int *plen)
+{
+ int rc;
+ int pbytes = (mpi_get_nbits(p)+7)/8;
+ size_t n;
+ unsigned char *buf, *ptr;
+
+ buf = kmalloc(1 + 2*pbytes, GFP_KERNEL);
+ if (!buf)
+ return NULL;
+ *buf = 04; /* Uncompressed point. */
+ ptr = buf+1;
+ rc = mpi_print(GCRYMPI_FMT_USG, ptr, pbytes, &n, x);
+ if (rc) {
+ kfree(buf);
+ return NULL;
+ }
+ if (n < pbytes) {
+ memmove(ptr+(pbytes-n), ptr, n);
+ memset(ptr, 0, (pbytes-n));
+ }
+ ptr += pbytes;
+ rc = mpi_print(GCRYMPI_FMT_USG, ptr, pbytes, &n, y);
+ if (rc) {
+ kfree(buf);
+ return NULL;
+ }
+ if (n < pbytes) {
+ memmove(ptr+(pbytes-n), ptr, n);
+ memset(ptr, 0, (pbytes-n));
+ }
+
+ if (plen)
+ *plen = 1 + 2 * pbytes;
+ return buf;
+}
+
+/* Convert POINT into affine coordinates using the context CTX and
+ * return a newly allocated MPI. If the conversion is not possible
+ * NULL is returned. This function won't print an error message.
+ */
+static unsigned char *
+sm2_mpi_ec_ec2os(MPI_POINT point, struct mpi_ec_ctx *ec, unsigned int *plen)
+{
+ MPI g_x, g_y;
+ unsigned char *result;
+
+ g_x = mpi_new(0);
+ g_y = mpi_new(0);
+ if (mpi_ec_get_affine(g_x, g_y, point, ec))
+ result = NULL;
+ else
+ result = sm2_ecc_ec2os(g_x, g_y, ec->p, plen);
+ mpi_free(g_x);
+ mpi_free(g_y);
+
+ return result;
+}
+
+/* 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;
+ const unsigned char *buf;
+ unsigned char *buf_memory;
+ MPI x, y;
+
+ n = (mpi_get_nbits(value)+7)/8;
+ buf_memory = kmalloc(n, GFP_KERNEL);
+ rc = mpi_print(GCRYMPI_FMT_USG, buf_memory, n, &n, value);
+ if (rc) {
+ kfree(buf_memory);
+ return rc;
+ }
+ buf = buf_memory;
+
+ if (n < 1) {
+ kfree(buf_memory);
+ return -EINVAL;
+ }
+ if (*buf != 4) {
+ kfree(buf_memory);
+ return -EINVAL; /* No support for point compression. */
+ }
+ if (((n-1)%2)) {
+ kfree(buf_memory);
+ return -EINVAL;
+ }
+ n = (n-1)/2;
+ x = mpi_read_raw_data(buf + 1, n);
+ if (!x) {
+ kfree(buf_memory);
+ return -ENOMEM;
+ }
+ y = mpi_read_raw_data(buf + 1 + n, n);
+ kfree(buf_memory);
+ if (!y) {
+ mpi_free(x);
+ return -ENOMEM;
+ }
+
+ mpi_normalize(x);
+ mpi_normalize(y);
+
+ mpi_set(result->x, x);
+ mpi_set(result->y, y);
+ mpi_set_ui(result->z, 1);
+
+ mpi_free(x);
+ mpi_free(y);
+
+ return 0;
+}
+
+/*
+ * Generate a random secret exponent K less than Q.
+ */
+static MPI sm2_gen_k(MPI q)
+{
+ MPI k = NULL;
+ unsigned int nbits = mpi_get_nbits(q);
+ unsigned int nbytes = (nbits+7)/8;
+ char rndbuf[128];
+ int use_rng = 1;
+
+ if (nbytes > sizeof(rndbuf))
+ return NULL;
+ if (crypto_get_default_rng())
+ use_rng = 0;
+
+ for (;;) {
+
+ if (k) {
+ mpi_free(k);
+ k = NULL;
+ }
+
+ if (use_rng) {
+ if (crypto_rng_get_bytes(crypto_default_rng,
+ rndbuf, nbytes))
+ goto ret;
+ } else {
+ get_random_bytes(rndbuf, nbytes);
+ }
+
+ k = mpi_read_raw_data(rndbuf, nbytes);
+ if (!k)
+ goto ret;
+
+ /* Make sure we have the requested number of bits. This code
+ * looks a bit funny but it is easy to understand if you
+ * consider that mpi_set_highbit clears all higher bits. We
+ * don't have a clear_highbit, thus we first set the high bit
+ * and then clear it again.
+ */
+ if (mpi_test_bit(k, nbits-1))
+ mpi_set_highbit(k, nbits-1);
+ else {
+ mpi_set_highbit(k, nbits-1);
+ mpi_clear_bit(k, nbits-1);
+ }
+
+ if (!(mpi_cmp(k, q) < 0)) /* check: k < q */
+ continue;
+ if (!(mpi_cmp_ui(k, 0) > 0)) /* check: k > 0 */
+ continue;
+
+ break; /* okay */
+ }
+ret:
+ if (use_rng)
+ crypto_put_default_rng();
+ return k;
+}
+
+static MPI sm2_cipher_encode(MPI c1, MPI c3, MPI c2)
+{
+ unsigned int n;
+ unsigned char *buf, *p;
+ unsigned int nwritten;
+ int rc;
+ MPI result = NULL;
+
+ n = mpi_get_size(c1) + mpi_get_size(c3) + mpi_get_size(c2);
+
+ buf = kmalloc(n, GFP_KERNEL);
+ if (!buf)
+ return NULL;
+
+ p = buf;
+ rc = mpi_read_buffer(c1, p, mpi_get_size(c1), &nwritten, NULL);
+ if (rc)
+ goto err;
+ p += nwritten;
+ rc = mpi_read_buffer(c3, p, mpi_get_size(c3), &nwritten, NULL);
+ if (rc)
+ goto err;
+ p += nwritten;
+ rc = mpi_read_buffer(c2, p, mpi_get_size(c2), &nwritten, NULL);
+ if (rc)
+ goto err;
+
+ result = mpi_read_raw_data(buf, p + nwritten - buf);
+
+err:
+ kfree(buf);
+ return result;
+}
+
+static int sm2_cipher_decode(MPI c, MPI *c1, MPI *c3, MPI *c2)
+{
+ unsigned char *buf, *p;
+ unsigned int n;
+
+ buf = mpi_get_buffer(c, &n, NULL);
+ if (!buf)
+ return -ENOMEM;
+ if (n < 65 + SM3_DIGEST_SIZE)
+ return -EINVAL;
+
+ p = buf;
+ /* '0x04' + 2 * 256 bits */
+ *c1 = mpi_read_raw_data(p, 65);
+ p += 65;
+ *c3 = mpi_read_raw_data(p, SM3_DIGEST_SIZE);
+ p += SM3_DIGEST_SIZE;
+ *c2 = mpi_read_raw_data(p, buf + n - p);
+
+ kfree(buf);
+
+ if (!*c1 || !*c3 || !*c2) {
+ mpi_free(*c1);
+ mpi_free(*c3);
+ mpi_free(*c2);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static MPI sm2_signature_encode(MPI hash, MPI r, MPI s)
+{
+ unsigned char *buf;
+ unsigned int nwritten;
+ unsigned int n;
+ int rc;
+ MPI result = NULL;
+
+ /* both r and s are 256 bits */
+ n = SM3_DIGEST_SIZE + 32 * 2;
+ buf = kzalloc(n, GFP_KERNEL);
+ if (!buf)
+ return NULL;
+
+ rc = mpi_read_buffer(hash, buf, SM3_DIGEST_SIZE, &nwritten, NULL);
+ if (rc)
+ goto err;
+ rc = mpi_read_buffer(r, buf + SM3_DIGEST_SIZE, 32, &nwritten, NULL);
+ if (rc)
+ goto err;
+ rc = mpi_read_buffer(s, buf + SM3_DIGEST_SIZE + 32,
+ 32, &nwritten, NULL);
+ if (rc)
+ goto err;
+
+ result = mpi_read_raw_data(buf, n);
+
+err:
+ kfree(buf);
+ return result;
+}
+
+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;
+
+ in = mpi_get_buffer(m, &inlen, NULL);
+ if (!in)
+ return -EINVAL;
+
+ if (inlen < pbytes) {
+ /* padding with zero */
+ crypto_sm3_update(desc, zero, pbytes - inlen);
+ crypto_sm3_update(desc, in, inlen);
+ } else if (inlen > pbytes) {
+ /* skip the starting zero */
+ crypto_sm3_update(desc, in + inlen - pbytes, pbytes);
+ } else {
+ crypto_sm3_update(desc, in, inlen);
+ }
+
+ kfree(in);
+ return 0;
+}
+
+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);
+
+ if (!mpi_ec_get_affine(x, y, point, ec) &&
+ !sm2_z_digest_update(desc, x, pbytes) &&
+ !sm2_z_digest_update(desc, y, pbytes))
+ ret = 0;
+
+ mpi_free(x);
+ mpi_free(y);
+ return ret;
+}
+
+int sm2_compute_z_digest(struct crypto_akcipher *tfm,
+ const unsigned char *id, size_t id_len,
+ unsigned char dgst[SM3_DIGEST_SIZE])
+{
+ struct mpi_ec_ctx *ec = akcipher_tfm_ctx(tfm);
+ uint16_t bits_len;
+ unsigned char entl[2];
+ SHASH_DESC_ON_STACK(desc, NULL);
+ unsigned int pbytes;
+
+ if (id_len > (USHRT_MAX / 8) || !ec->Q)
+ return -EINVAL;
+
+ bits_len = (uint16_t)(id_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) */
+ sm3_base_init(desc);
+ crypto_sm3_update(desc, entl, 2);
+ crypto_sm3_update(desc, id, id_len);
+
+ if (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))
+ return -EINVAL;
+
+ crypto_sm3_finup(desc, NULL, 0, dgst);
+ return 0;
+}
+EXPORT_SYMBOL(sm2_compute_z_digest);
+
+/* Key derivation function from X9.63/SECG */
+static void kdf_x9_63(const void *in, size_t inlen, void *out, size_t outlen)
+{
+ int mdlen = SM3_DIGEST_SIZE;
+ u32 counter = 1;
+ u32 counter_be;
+ unsigned char dgst[SM3_DIGEST_SIZE];
+ unsigned char *pout = out;
+ size_t rlen = outlen;
+ size_t len;
+ SHASH_DESC_ON_STACK(desc, NULL);
+
+ while (rlen > 0) {
+ counter_be = cpu_to_be32(counter);
+ counter++;
+
+ sm3_base_init(desc);
+ crypto_sm3_update(desc, in, inlen);
+ crypto_sm3_finup(desc, (const u8 *)&counter_be,
+ sizeof(counter_be), dgst);
+
+ len = mdlen < rlen ? mdlen : rlen; /* min(mdlen, rlen) */
+ memcpy(pout, dgst, len);
+ rlen -= len;
+ pout += len;
+ }
+}
+
+static int _sm2_enc(struct mpi_ec_ctx *ec, MPI m, MPI *c1, MPI *c3, MPI *c2)
+{
+ int rc;
+ MPI k = NULL;
+ MPI x2, y2;
+ struct gcry_mpi_point kG, kP;
+ unsigned char *in = NULL;
+ unsigned int inlen;
+ unsigned int len;
+ unsigned char *x1y1 = NULL;
+ unsigned char *x2y2 = NULL;
+ unsigned char *cipher = NULL;
+ int i;
+
+ mpi_point_init(&kG);
+ mpi_point_init(&kP);
+ x2 = mpi_new(0);
+ y2 = mpi_new(0);
+
+ rc = -ENOMEM;
+ in = mpi_get_buffer(m, &inlen, NULL);
+ if (!in)
+ goto leave;
+
+ cipher = kmalloc(inlen, GFP_KERNEL);
+ if (!cipher)
+ goto leave;
+
+ /* rand k in [1, n-1] */
+ k = sm2_gen_k(ec->n);
+ if (k == NULL)
+ goto leave;
+
+ /* [k]G = (x1, y1) */
+ mpi_ec_mul_point(&kG, k, ec->G, ec);
+ x1y1 = sm2_mpi_ec_ec2os(&kG, ec, &len);
+ if (x1y1 == NULL)
+ goto leave;
+ *c1 = mpi_read_raw_data(x1y1, len);
+ if (*c1 == NULL)
+ goto leave;
+
+ /* [k]P = (x2, y2) */
+ rc = -EINVAL;
+ mpi_ec_mul_point(&kP, k, ec->Q, ec);
+ if (mpi_ec_get_affine(x2, y2, &kP, ec))
+ goto leave;
+
+ /* t = KDF(x2 || y2, klen) */
+ rc = -ENOMEM;
+ x2y2 = sm2_ecc_ec2os(x2, y2, ec->p, &len);
+ if (x2y2 == NULL)
+ goto leave;
+
+ /* skip the prefix '0x04' */
+ kdf_x9_63(x2y2 + 1, len - 1, cipher, inlen);
+
+ /* cipher = t xor in */
+ for (i = 0; i < inlen; i++)
+ cipher[i] ^= in[i];
+
+ *c2 = mpi_read_raw_data(cipher, inlen);
+ if (*c2 == NULL) {
+ rc = -ENOMEM;
+ goto leave;
+ }
+
+ /* hash(x2 || IN || y2) */
+ do {
+ SHASH_DESC_ON_STACK(desc, NULL);
+ unsigned char dgst[SM3_DIGEST_SIZE];
+
+ sm3_base_init(desc);
+ crypto_sm3_update(desc, x2y2 + 1, MPI_NBYTES(x2));
+ crypto_sm3_update(desc, in, inlen);
+ crypto_sm3_finup(desc, x2y2 + 1 + MPI_NBYTES(x2),
+ MPI_NBYTES(y2), dgst);
+
+ *c3 = mpi_read_raw_data(dgst, sizeof(dgst));
+ if (*c3 == NULL) {
+ rc = -ENOMEM;
+ goto leave;
+ }
+ } while (0);
+
+ rc = 0;
+
+leave:
+ if (rc) {
+ if (*c1)
+ mpi_free(*c1);
+ if (*c2)
+ mpi_free(*c2);
+ if (*c3)
+ mpi_free(*c3);
+ *c1 = NULL;
+ *c2 = NULL;
+ *c3 = NULL;
+ }
+
+ kfree(x2y2);
+ kfree(x1y1);
+ mpi_free(k);
+
+ kfree(cipher);
+ kfree(in);
+
+ mpi_point_free_parts(&kG);
+ mpi_point_free_parts(&kP);
+ mpi_free(x2);
+ mpi_free(y2);
+
+ return rc;
+}
+
+static int _sm2_dec(struct mpi_ec_ctx *ec, MPI c1, MPI c3, MPI c2, MPI *m)
+{
+ int rc;
+ MPI x2, y2;
+ struct gcry_mpi_point point_c1;
+ struct gcry_mpi_point kP;
+ unsigned char *x2y2 = NULL;
+ unsigned char *in = NULL;
+ unsigned int inlen;
+ unsigned char *plain = NULL;
+ unsigned int len;
+ unsigned char *hash = NULL;
+ int i;
+
+ mpi_point_init(&point_c1);
+ mpi_point_init(&kP);
+ x2 = mpi_new(0);
+ y2 = mpi_new(0);
+
+ rc = -ENOMEM;
+ in = mpi_get_buffer(c2, &inlen, NULL);
+ if (!in)
+ goto leave;
+
+ plain = kmalloc(inlen, GFP_KERNEL);
+ if (!plain)
+ goto leave;
+
+ rc = sm2_ecc_os2ec(&point_c1, c1);
+ if (rc)
+ goto leave;
+
+ rc = -EINVAL;
+ if (!mpi_ec_curve_point(&point_c1, ec))
+ goto leave;
+
+ /* [d]C1 = (x2, y2), C1 = [k]G */
+ mpi_ec_mul_point(&kP, ec->d, &point_c1, ec);
+ if (mpi_ec_get_affine(x2, y2, &kP, ec))
+ goto leave;
+
+ /* t = KDF(x2 || y2, inlen) */
+ x2y2 = sm2_ecc_ec2os(x2, y2, ec->p, &len);
+ /* skip the prefix '0x04' */
+ kdf_x9_63(x2y2 + 1, len - 1, plain, inlen);
+
+ /* plain = C2 xor t */
+ for (i = 0; i < inlen; i++)
+ plain[i] ^= in[i];
+
+ /* Hash(x2 || IN || y2) == C3 */
+ do {
+ SHASH_DESC_ON_STACK(desc, NULL);
+ unsigned char dgst[SM3_DIGEST_SIZE];
+
+ sm3_base_init(desc);
+ crypto_sm3_update(desc, x2y2 + 1, MPI_NBYTES(x2));
+ crypto_sm3_update(desc, plain, inlen);
+ crypto_sm3_finup(desc, x2y2 + 1 + MPI_NBYTES(x2),
+ MPI_NBYTES(y2), dgst);
+
+ rc = -EINVAL;
+ hash = mpi_get_buffer(c3, &len, NULL);
+ if (len != sizeof(dgst) || memcmp(dgst, hash, len) != 0)
+ goto leave;
+ } while (0);
+
+ rc = -ENOMEM;
+ *m = mpi_read_raw_data(plain, inlen);
+ if (*m == NULL)
+ goto leave;
+
+ rc = 0;
+
+leave:
+ kfree(hash);
+ kfree(x2y2);
+ if (plain) {
+ memset(plain, 0, inlen);
+ kfree(plain);
+ }
+ kfree(in);
+
+ mpi_point_free_parts(&point_c1);
+ mpi_point_free_parts(&kP);
+ mpi_free(x2);
+ mpi_free(y2);
+
+ return rc;
+}
+
+static int _sm2_sign(struct mpi_ec_ctx *ec, MPI hash, MPI *r, MPI *s)
+{
+ int rc = -EINVAL;
+ struct gcry_mpi_point kG;
+ MPI sig_r = NULL;
+ MPI sig_s = NULL;
+ MPI tmp = NULL;
+ MPI k = NULL;
+ MPI rk = NULL;
+ MPI x1 = NULL;
+
+ mpi_point_init(&kG);
+ x1 = mpi_new(0);
+ sig_r = mpi_new(0);
+ sig_s = mpi_new(0);
+ rk = mpi_new(0);
+ tmp = mpi_new(0);
+
+ for (;;) {
+ /* rand k in [1, n-1] */
+ k = sm2_gen_k(ec->n);
+ if (k == NULL)
+ goto leave;
+
+ /* [k]G = (x1, y1) */
+ mpi_ec_mul_point(&kG, k, ec->G, ec);
+ if (mpi_ec_get_affine(x1, NULL, &kG, ec))
+ goto leave;
+
+ /* r = (e + x1) % n */
+ mpi_addm(sig_r, hash, x1, ec->n);
+
+ /* r != 0 && r + k != n */
+ if (mpi_cmp_ui(sig_r, 0) == 0)
+ continue;
+ mpi_add(rk, sig_r, k);
+ if (mpi_cmp(rk, ec->n) == 0)
+ continue;
+
+ /* s = ((d + 1)^-1 * (k - rd)) % n */
+ mpi_addm(sig_s, ec->d, mpi_const(MPI_C_ONE), ec->n);
+ mpi_invm(sig_s, sig_s, ec->n);
+ mpi_mulm(tmp, sig_r, ec->d, ec->n);
+ mpi_subm(tmp, k, tmp, ec->n);
+ mpi_mulm(sig_s, sig_s, tmp, ec->n);
+
+ break;
+ }
+
+ *r = sig_r;
+ *s = sig_s;
+ rc = 0;
+
+leave:
+ if (rc) {
+ mpi_free(sig_r);
+ mpi_free(sig_s);
+ }
+ mpi_point_free_parts(&kG);
+ mpi_free(x1);
+ mpi_free(k);
+ mpi_free(rk);
+ mpi_free(tmp);
+
+ return rc;
+}
+
+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_enc(struct akcipher_request *req)
+{
+ struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+ struct mpi_ec_ctx *ec = akcipher_tfm_ctx(tfm);
+ MPI m, c;
+ MPI c1 = NULL, c3 = NULL, c2 = NULL;
+ int ret = 0;
+ int sign;
+
+ if (unlikely(!ec->Q))
+ return -EINVAL;
+
+ m = mpi_read_raw_from_sgl(req->src, req->src_len);
+ if (!m)
+ return -ENOMEM;
+
+ ret = _sm2_enc(ec, m, &c1, &c3, &c2);
+ if (ret)
+ goto err_free_m;
+
+ ret = -EFAULT;
+ c = sm2_cipher_encode(c1, c3, c2);
+ if (!c)
+ goto err_free_c;
+
+ ret = mpi_write_to_sgl(c, req->dst, req->dst_len, &sign);
+ if (ret)
+ goto err_free_cipher;
+
+ if (sign < 0)
+ ret = -EBADMSG;
+
+err_free_cipher:
+ mpi_free(c);
+err_free_c:
+ mpi_free(c1);
+ mpi_free(c3);
+ mpi_free(c2);
+err_free_m:
+ mpi_free(m);
+ return ret;
+}
+
+static int sm2_dec(struct akcipher_request *req)
+{
+ struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+ struct mpi_ec_ctx *ec = akcipher_tfm_ctx(tfm);
+ MPI m, c;
+ MPI c1 = NULL, c3 = NULL, c2 = NULL;
+ int ret = 0;
+ int sign;
+
+ if (unlikely(!ec->d))
+ return -EINVAL;
+
+ c = mpi_read_raw_from_sgl(req->src, req->src_len);
+ if (!c)
+ return -ENOMEM;
+
+ ret = sm2_cipher_decode(c, &c1, &c3, &c2);
+ if (ret)
+ goto err_free_cipher;
+
+ ret = _sm2_dec(ec, c1, c3, c2, &m);
+ if (ret)
+ goto err_free_c;
+
+ ret = mpi_write_to_sgl(m, req->dst, req->dst_len, &sign);
+ if (ret)
+ goto err_free_m;
+
+ if (sign < 0)
+ ret = -EBADMSG;
+
+err_free_m:
+ mpi_free(m);
+err_free_c:
+ mpi_free(c1);
+ mpi_free(c3);
+ mpi_free(c2);
+err_free_cipher:
+ mpi_free(c);
+ return ret;
+}
+
+static int sm2_sign(struct akcipher_request *req)
+{
+ struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+ struct mpi_ec_ctx *ec = akcipher_tfm_ctx(tfm);
+ MPI hash, c;
+ MPI r = NULL, s = NULL;
+ int ret = 0;
+ int sign;
+
+ if (unlikely(!ec->d))
+ return -EINVAL;
+
+ hash = mpi_read_raw_from_sgl(req->src, req->src_len);
+ if (!hash)
+ return -ENOMEM;
+
+ ret = _sm2_sign(ec, hash, &r, &s);
+ if (ret)
+ goto err_free_hash;
+
+ ret = -EFAULT;
+ c = sm2_signature_encode(hash, r, s);
+ if (!c)
+ goto err_free_r;
+
+ ret = mpi_write_to_sgl(c, req->dst, req->dst_len, &sign);
+ if (ret)
+ goto err_free_c;
+
+ if (sign < 0)
+ ret = -EBADMSG;
+
+err_free_c:
+ mpi_free(c);
+err_free_r:
+ mpi_free(r);
+ mpi_free(s);
+err_free_hash:
+ mpi_free(hash);
+ return ret;
+}
+
+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);
+ MPI a;
+ int rc;
+
+ rc = sm2_ec_ctx_reset(ec);
+ if (rc)
+ return rc;
+
+ ec->Q = mpi_point_new(0);
+ if (!ec->Q)
+ return -ENOMEM;
+
+ /* include the uncompressed flag '0x04' */
+ rc = -ENOMEM;
+ a = mpi_read_raw_data(key, keylen);
+ if (!a)
+ goto error;
+
+ mpi_normalize(a);
+ rc = sm2_ecc_os2ec(ec->Q, a);
+ mpi_free(a);
+ if (rc)
+ goto error;
+
+ return 0;
+
+error:
+ mpi_point_release(ec->Q);
+ ec->Q = NULL;
+ return rc;
+}
+
+static int sm2_set_priv_key(struct crypto_akcipher *tfm, const void *key,
+ unsigned int keylen)
+{
+ struct mpi_ec_ctx *ec = akcipher_tfm_ctx(tfm);
+ int rc;
+
+ rc = sm2_ec_ctx_reset(ec);
+ if (rc)
+ return rc;
+
+ ec->d = mpi_read_raw_data(key, keylen);
+ if (!ec->d)
+ return -ENOMEM;
+
+ /* compute pubkey if it not exist */
+ if (!ec->Q) {
+ ec->Q = mpi_point_new(0);
+ if (!ec->Q)
+ return -ENOMEM;
+ mpi_ec_mul_point(ec->Q, ec->d, ec->G, ec);
+ }
+
+ return 0;
+}
+
+static unsigned int sm2_max_size(struct crypto_akcipher *tfm)
+{
+ /* Unlimited max size */
+ return PAGE_SIZE;
+}
+
+static void sm2_exit_tfm(struct crypto_akcipher *tfm)
+{
+ struct mpi_ec_ctx *ec = akcipher_tfm_ctx(tfm);
+
+ mpi_ec_deinit(ec);
+}
+
+static struct akcipher_alg sm2 = {
+ .encrypt = sm2_enc,
+ .decrypt = sm2_dec,
+ .sign = sm2_sign,
+ .verify = sm2_verify,
+ .set_priv_key = sm2_set_priv_key,
+ .set_pub_key = sm2_set_pub_key,
+ .max_size = sm2_max_size,
+ .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 sm2_init(void)
+{
+ return crypto_register_akcipher(&sm2);
+}
+
+static void sm2_exit(void)
+{
+ crypto_unregister_akcipher(&sm2);
+}
+
+subsys_initcall(sm2_init);
+module_exit(sm2_exit);
+
+MODULE_ALIAS_CRYPTO("sm2");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("SM2 generic algorithm");
diff --git a/crypto/sm2signature.asn1 b/crypto/sm2signature.asn1
new file mode 100644
index 000000000000..ab8c0b754d21
--- /dev/null
+++ b/crypto/sm2signature.asn1
@@ -0,0 +1,4 @@
+Sm2Signature ::= SEQUENCE {
+ sig_r INTEGER ({ sm2_get_signature_r }),
+ sig_s INTEGER ({ sm2_get_signature_s })
+}
diff --git a/include/crypto/sm2.h b/include/crypto/sm2.h
new file mode 100644
index 000000000000..af452556dcd4
--- /dev/null
+++ b/include/crypto/sm2.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * sm2.h - 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.
+ * Written by Tianjia Zhang <tianjia.zhang@xxxxxxxxxxxxxxxxx>
+ */
+
+#ifndef _CRYPTO_SM2_H
+#define _CRYPTO_SM2_H
+
+#include <crypto/sm3.h>
+#include <crypto/akcipher.h>
+
+/* The default user id as specified in GM/T 0009-2012 */
+#define SM2_DEFAULT_USERID "1234567812345678"
+#define SM2_DEFAULT_USERID_LEN 16
+
+extern int sm2_compute_z_digest(struct crypto_akcipher *tfm,
+ const unsigned char *id, size_t id_len,
+ unsigned char dgst[SM3_DIGEST_SIZE]);
+
+#endif /* _CRYPTO_SM2_H */
--
2.17.1