[PATCH v2 13/15] crypto: arm64/sm4 - add CE implementation for cmac/xcbc/cbcmac

From: Tianjia Zhang
Date: Tue Oct 18 2022 - 03:11:48 EST

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This patch is a CE-optimized assembly implementation for cmac/xcbc/cbcmac.

Benchmark on T-Head Yitian-710 2.75 GHz, the data comes from the 300 mode of
tcrypt, and compared the performance before and after this patch (the driver
used before this patch is XXXmac(sm4-ce)). The abscissas are blocks of
different lengths. The data is tabulated and the unit is Mb/s:

Before:

update-size | 16 64 256 1024 2048 4096 8192
---------------+--------------------------------------------------------
cmac(sm4-ce) | 293.33 403.69 503.76 527.78 531.10 535.46 535.81
xcbc(sm4-ce) | 292.83 402.50 504.02 529.08 529.87 536.55 538.24
cbcmac(sm4-ce) | 318.42 415.79 497.12 515.05 523.15 521.19 523.01

After:

update-size | 16 64 256 1024 2048 4096 8192
---------------+--------------------------------------------------------
cmac-sm4-ce | 371.99 675.28 903.56 971.65 980.57 990.40 991.04
xcbc-sm4-ce | 372.11 674.55 903.47 971.61 980.96 990.42 991.10
cbcmac-sm4-ce | 371.63 675.33 903.23 972.07 981.42 990.93 991.45

Signed-off-by: Tianjia Zhang <tianjia.zhang@xxxxxxxxxxxxxxxxx>
---
arch/arm64/crypto/sm4-ce-core.S | 70 +++++++++
arch/arm64/crypto/sm4-ce-glue.c | 267 +++++++++++++++++++++++++++++++-
2 files changed, 336 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/crypto/sm4-ce-core.S b/arch/arm64/crypto/sm4-ce-core.S
index 6b923c3209a0..69fe3b90b7ad 100644
--- a/arch/arm64/crypto/sm4-ce-core.S
+++ b/arch/arm64/crypto/sm4-ce-core.S
@@ -35,6 +35,7 @@
#define RTMP3 v19

#define RIV v20
+#define RMAC v20
#define RMASK v21

@@ -1049,6 +1050,75 @@ SYM_FUNC_START(sm4_ce_xts_dec)
ret
SYM_FUNC_END(sm4_ce_xts_dec)

+.align 3
+SYM_FUNC_START(sm4_ce_mac_update)
+ /* input:
+ * x0: round key array, CTX
+ * x1: digest
+ * x2: src
+ * w3: nblocks
+ * w4: enc_before
+ * w5: enc_after
+ */
+ SM4_PREPARE(x0)
+
+ ld1 {RMAC.16b}, [x1]
+
+ cbz w4, .Lmac_update
+
+ SM4_CRYPT_BLK(RMAC)
+
+.Lmac_update:
+ cbz w3, .Lmac_ret
+
+ sub w6, w3, #1
+ cmp w5, wzr
+ csel w3, w3, w6, ne
+
+ cbz w3, .Lmac_end
+
+.Lmac_loop_4x:
+ cmp w3, #4
+ blt .Lmac_loop_1x
+
+ sub w3, w3, #4
+
+ ld1 {v0.16b-v3.16b}, [x2], #64
+
+ eor RMAC.16b, RMAC.16b, v0.16b
+ SM4_CRYPT_BLK(RMAC)
+ eor RMAC.16b, RMAC.16b, v1.16b
+ SM4_CRYPT_BLK(RMAC)
+ eor RMAC.16b, RMAC.16b, v2.16b
+ SM4_CRYPT_BLK(RMAC)
+ eor RMAC.16b, RMAC.16b, v3.16b
+ SM4_CRYPT_BLK(RMAC)
+
+ cbz w3, .Lmac_end
+ b .Lmac_loop_4x
+
+.Lmac_loop_1x:
+ sub w3, w3, #1
+
+ ld1 {v0.16b}, [x2], #16
+
+ eor RMAC.16b, RMAC.16b, v0.16b
+ SM4_CRYPT_BLK(RMAC)
+
+ cbnz w3, .Lmac_loop_1x
+
+
+.Lmac_end:
+ cbnz w5, .Lmac_ret
+
+ ld1 {v0.16b}, [x2], #16
+ eor RMAC.16b, RMAC.16b, v0.16b
+
+.Lmac_ret:
+ st1 {RMAC.16b}, [x1]
+ ret
+SYM_FUNC_END(sm4_ce_mac_update)
+

.section ".rodata", "a"
.align 4
diff --git a/arch/arm64/crypto/sm4-ce-glue.c b/arch/arm64/crypto/sm4-ce-glue.c
index 6267ec1cfac0..c2d10b8e92b2 100644
--- a/arch/arm64/crypto/sm4-ce-glue.c
+++ b/arch/arm64/crypto/sm4-ce-glue.c
@@ -14,8 +14,10 @@
#include <linux/cpufeature.h>
#include <asm/neon.h>
#include <asm/simd.h>
+#include <crypto/b128ops.h>
#include <crypto/internal/simd.h>
#include <crypto/internal/skcipher.h>
+#include <crypto/internal/hash.h>
#include <crypto/scatterwalk.h>
#include <crypto/xts.h>
#include <crypto/sm4.h>
@@ -55,6 +57,9 @@ asmlinkage void sm4_ce_xts_enc(const u32 *rkey1, u8 *dst, const u8 *src,
asmlinkage void sm4_ce_xts_dec(const u32 *rkey1, u8 *dst, const u8 *src,
u8 *tweak, unsigned int nbytes,
const u32 *rkey2_enc);
+asmlinkage void sm4_ce_mac_update(const u32 *rkey_enc, u8 *digest,
+ const u8 *src, unsigned int nblocks,
+ bool enc_before, bool enc_after);

EXPORT_SYMBOL(sm4_ce_expand_key);
EXPORT_SYMBOL(sm4_ce_crypt_block);
@@ -72,6 +77,16 @@ struct sm4_essiv_cbc_ctx {
struct crypto_shash *hash;
};

+struct sm4_mac_tfm_ctx {
+ struct sm4_ctx key;
+ u8 __aligned(8) consts[];
+};
+
+struct sm4_mac_desc_ctx {
+ unsigned int len;
+ u8 digest[SM4_BLOCK_SIZE];
+};
+
static int sm4_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int key_len)
{
@@ -721,13 +736,260 @@ static struct skcipher_alg sm4_algs[] = {
}
};

+static int sm4_cbcmac_setkey(struct crypto_shash *tfm, const u8 *key,
+ unsigned int key_len)
+{
+ struct sm4_mac_tfm_ctx *ctx = crypto_shash_ctx(tfm);
+
+ if (key_len != SM4_KEY_SIZE)
+ return -EINVAL;
+
+ kernel_neon_begin();
+ sm4_ce_expand_key(key, ctx->key.rkey_enc, ctx->key.rkey_dec,
+ crypto_sm4_fk, crypto_sm4_ck);
+ kernel_neon_end();
+
+ return 0;
+}
+
+static int sm4_cmac_setkey(struct crypto_shash *tfm, const u8 *key,
+ unsigned int key_len)
+{
+ struct sm4_mac_tfm_ctx *ctx = crypto_shash_ctx(tfm);
+ be128 *consts = (be128 *)ctx->consts;
+ u64 a, b;
+
+ if (key_len != SM4_KEY_SIZE)
+ return -EINVAL;
+
+ memset(consts, 0, SM4_BLOCK_SIZE);
+
+ kernel_neon_begin();
+
+ sm4_ce_expand_key(key, ctx->key.rkey_enc, ctx->key.rkey_dec,
+ crypto_sm4_fk, crypto_sm4_ck);
+
+ /* encrypt the zero block */
+ sm4_ce_crypt_block(ctx->key.rkey_enc, (u8 *)consts, (const u8 *)consts);
+
+ kernel_neon_end();
+
+ /* gf(2^128) multiply zero-ciphertext with u and u^2 */
+ a = be64_to_cpu(consts[0].a);
+ b = be64_to_cpu(consts[0].b);
+ consts[0].a = cpu_to_be64((a << 1) | (b >> 63));
+ consts[0].b = cpu_to_be64((b << 1) ^ ((a >> 63) ? 0x87 : 0));
+
+ a = be64_to_cpu(consts[0].a);
+ b = be64_to_cpu(consts[0].b);
+ consts[1].a = cpu_to_be64((a << 1) | (b >> 63));
+ consts[1].b = cpu_to_be64((b << 1) ^ ((a >> 63) ? 0x87 : 0));
+
+ return 0;
+}
+
+static int sm4_xcbc_setkey(struct crypto_shash *tfm, const u8 *key,
+ unsigned int key_len)
+{
+ struct sm4_mac_tfm_ctx *ctx = crypto_shash_ctx(tfm);
+ u8 __aligned(8) key2[SM4_BLOCK_SIZE];
+ static u8 const ks[3][SM4_BLOCK_SIZE] = {
+ { [0 ... SM4_BLOCK_SIZE - 1] = 0x1},
+ { [0 ... SM4_BLOCK_SIZE - 1] = 0x2},
+ { [0 ... SM4_BLOCK_SIZE - 1] = 0x3},
+ };
+
+ if (key_len != SM4_KEY_SIZE)
+ return -EINVAL;
+
+ kernel_neon_begin();
+
+ sm4_ce_expand_key(key, ctx->key.rkey_enc, ctx->key.rkey_dec,
+ crypto_sm4_fk, crypto_sm4_ck);
+
+ sm4_ce_crypt_block(ctx->key.rkey_enc, key2, ks[0]);
+ sm4_ce_crypt(ctx->key.rkey_enc, ctx->consts, ks[1], 2);
+
+ sm4_ce_expand_key(key2, ctx->key.rkey_enc, ctx->key.rkey_dec,
+ crypto_sm4_fk, crypto_sm4_ck);
+
+ kernel_neon_end();
+
+ return 0;
+}
+
+static int sm4_mac_init(struct shash_desc *desc)
+{
+ struct sm4_mac_desc_ctx *ctx = shash_desc_ctx(desc);
+
+ memset(ctx->digest, 0, SM4_BLOCK_SIZE);
+ ctx->len = 0;
+
+ return 0;
+}
+
+static int sm4_mac_update(struct shash_desc *desc, const u8 *p,
+ unsigned int len)
+{
+ struct sm4_mac_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
+ struct sm4_mac_desc_ctx *ctx = shash_desc_ctx(desc);
+ unsigned int l, nblocks;
+
+ if (len == 0)
+ return 0;
+
+ if (ctx->len || ctx->len + len < SM4_BLOCK_SIZE) {
+ l = min(len, SM4_BLOCK_SIZE - ctx->len);
+
+ crypto_xor(ctx->digest + ctx->len, p, l);
+ ctx->len += l;
+ len -= l;
+ p += l;
+ }
+
+ if (len && (ctx->len % SM4_BLOCK_SIZE) == 0) {
+ kernel_neon_begin();
+
+ if (len < SM4_BLOCK_SIZE && ctx->len == SM4_BLOCK_SIZE) {
+ sm4_ce_crypt_block(tctx->key.rkey_enc,
+ ctx->digest, ctx->digest);
+ ctx->len = 0;
+ } else {
+ nblocks = len / SM4_BLOCK_SIZE;
+ len %= SM4_BLOCK_SIZE;
+
+ sm4_ce_mac_update(tctx->key.rkey_enc, ctx->digest, p,
+ nblocks, (ctx->len == SM4_BLOCK_SIZE),
+ (len != 0));
+
+ p += nblocks * SM4_BLOCK_SIZE;
+
+ if (len == 0)
+ ctx->len = SM4_BLOCK_SIZE;
+ }
+
+ kernel_neon_end();
+
+ if (len) {
+ crypto_xor(ctx->digest, p, len);
+ ctx->len = len;
+ }
+ }
+
+ return 0;
+}
+
+static int sm4_cmac_final(struct shash_desc *desc, u8 *out)
+{
+ struct sm4_mac_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
+ struct sm4_mac_desc_ctx *ctx = shash_desc_ctx(desc);
+ const u8 *consts = tctx->consts;
+
+ if (ctx->len != SM4_BLOCK_SIZE) {
+ ctx->digest[ctx->len] ^= 0x80;
+ consts += SM4_BLOCK_SIZE;
+ }
+
+ kernel_neon_begin();
+ sm4_ce_mac_update(tctx->key.rkey_enc, ctx->digest, consts, 1,
+ false, true);
+ kernel_neon_end();
+
+ memcpy(out, ctx->digest, SM4_BLOCK_SIZE);
+
+ return 0;
+}
+
+static int sm4_cbcmac_final(struct shash_desc *desc, u8 *out)
+{
+ struct sm4_mac_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
+ struct sm4_mac_desc_ctx *ctx = shash_desc_ctx(desc);
+
+ if (ctx->len) {
+ kernel_neon_begin();
+ sm4_ce_crypt_block(tctx->key.rkey_enc, ctx->digest,
+ ctx->digest);
+ kernel_neon_end();
+ }
+
+ memcpy(out, ctx->digest, SM4_BLOCK_SIZE);
+
+ return 0;
+}
+
+static struct shash_alg sm4_mac_algs[] = {
+ {
+ .base = {
+ .cra_name = "cmac(sm4)",
+ .cra_driver_name = "cmac-sm4-ce",
+ .cra_priority = 400,
+ .cra_blocksize = SM4_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct sm4_mac_tfm_ctx)
+ + SM4_BLOCK_SIZE * 2,
+ .cra_module = THIS_MODULE,
+ },
+ .digestsize = SM4_BLOCK_SIZE,
+ .init = sm4_mac_init,
+ .update = sm4_mac_update,
+ .final = sm4_cmac_final,
+ .setkey = sm4_cmac_setkey,
+ .descsize = sizeof(struct sm4_mac_desc_ctx),
+ }, {
+ .base = {
+ .cra_name = "xcbc(sm4)",
+ .cra_driver_name = "xcbc-sm4-ce",
+ .cra_priority = 400,
+ .cra_blocksize = SM4_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct sm4_mac_tfm_ctx)
+ + SM4_BLOCK_SIZE * 2,
+ .cra_module = THIS_MODULE,
+ },
+ .digestsize = SM4_BLOCK_SIZE,
+ .init = sm4_mac_init,
+ .update = sm4_mac_update,
+ .final = sm4_cmac_final,
+ .setkey = sm4_xcbc_setkey,
+ .descsize = sizeof(struct sm4_mac_desc_ctx),
+ }, {
+ .base = {
+ .cra_name = "cbcmac(sm4)",
+ .cra_driver_name = "cbcmac-sm4-ce",
+ .cra_priority = 400,
+ .cra_blocksize = 1,
+ .cra_ctxsize = sizeof(struct sm4_mac_tfm_ctx),
+ .cra_module = THIS_MODULE,
+ },
+ .digestsize = SM4_BLOCK_SIZE,
+ .init = sm4_mac_init,
+ .update = sm4_mac_update,
+ .final = sm4_cbcmac_final,
+ .setkey = sm4_cbcmac_setkey,
+ .descsize = sizeof(struct sm4_mac_desc_ctx),
+ }
+};
+
static int __init sm4_init(void)
{
- return crypto_register_skciphers(sm4_algs, ARRAY_SIZE(sm4_algs));
+ int err;
+
+ err = crypto_register_skciphers(sm4_algs, ARRAY_SIZE(sm4_algs));
+ if (err)
+ return err;
+
+ err = crypto_register_shashes(sm4_mac_algs, ARRAY_SIZE(sm4_mac_algs));
+ if (err)
+ goto out_err;
+
+ return 0;
+
+out_err:
+ crypto_unregister_skciphers(sm4_algs, ARRAY_SIZE(sm4_algs));
+ return err;
}

static void __exit sm4_exit(void)
{
+ crypto_unregister_shashes(sm4_mac_algs, ARRAY_SIZE(sm4_mac_algs));
crypto_unregister_skciphers(sm4_algs, ARRAY_SIZE(sm4_algs));
}

@@ -744,5 +1006,8 @@ MODULE_ALIAS_CRYPTO("ctr(sm4)");
MODULE_ALIAS_CRYPTO("cts(cbc(sm4))");
MODULE_ALIAS_CRYPTO("xts(sm4)");
MODULE_ALIAS_CRYPTO("essiv(cbc(sm4),sm3)");
+MODULE_ALIAS_CRYPTO("cmac(sm4)");
+MODULE_ALIAS_CRYPTO("xcbc(sm4)");
+MODULE_ALIAS_CRYPTO("cbcmac(sm4)");
MODULE_AUTHOR("Tianjia Zhang <tianjia.zhang@xxxxxxxxxxxxxxxxx>");
MODULE_LICENSE("GPL v2");
--
2.24.3 (Apple Git-128)

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