--- /dev/null
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * SM4-CCM AEAD Algorithm using ARMv8 Crypto Extensions
+ * as specified in rfc8998
+ * https://datatracker.ietf.org/doc/html/rfc8998
+ *
+ * Copyright (C) 2022 Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include "sm4-ce-asm.h"
+
+.arch armv8-a+crypto
+
+.irp b, 0, 1, 8, 9, 10, 11, 12, 13, 14, 15, 16, 24, 25, 26, 27, 28, 29, 30, 31
+ .set .Lv\b\().4s, \b
+.endr
+
+.macro sm4e, vd, vn
+ .inst 0xcec08400 | (.L\vn << 5) | .L\vd
+.endm
+
+/* Register macros */
+
+#define RMAC v16
+
+/* Helper macros. */
+
+#define inc_le128(vctr) \
+ mov vctr.d[1], x8; \
+ mov vctr.d[0], x7; \
+ adds x8, x8, #1; \
+ rev64 vctr.16b, vctr.16b; \
+ adc x7, x7, xzr;
+
+
+.align 3
+SYM_FUNC_START(sm4_ce_cbcmac_update)
+ /* input:
+ * x0: round key array, CTX
+ * x1: mac
+ * x2: src
+ * w3: nblocks
+ */
+ SM4_PREPARE(x0)
+
+ ld1 {RMAC.16b}, [x1]
+
+.Lcbcmac_loop_4x:
+ cmp w3, #4
+ blt .Lcbcmac_loop_1x
+
+ sub w3, w3, #4
+
+ ld1 {v0.16b-v3.16b}, [x2], #64
+
+ SM4_CRYPT_BLK(RMAC)
+ 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
+
+ cbz w3, .Lcbcmac_end
+ b .Lcbcmac_loop_4x
+
+.Lcbcmac_loop_1x:
+ sub w3, w3, #1
+
+ ld1 {v0.16b}, [x2], #16
+
+ SM4_CRYPT_BLK(RMAC)
+ eor RMAC.16b, RMAC.16b, v0.16b
+
+ cbnz w3, .Lcbcmac_loop_1x
+
+.Lcbcmac_end:
+ st1 {RMAC.16b}, [x1]
+ ret
+SYM_FUNC_END(sm4_ce_cbcmac_update)
+
+.align 3
+SYM_FUNC_START(sm4_ce_ccm_final)
+ /* input:
+ * x0: round key array, CTX
+ * x1: ctr0 (big endian, 128 bit)
+ * x2: mac
+ */
+ SM4_PREPARE(x0)
+
+ ld1 {RMAC.16b}, [x2]
+ ld1 {v0.16b}, [x1]
+
+ SM4_CRYPT_BLK2(RMAC, v0)
+
+ /* en-/decrypt the mac with ctr0 */
+ eor RMAC.16b, RMAC.16b, v0.16b
+ st1 {RMAC.16b}, [x2]
+
+ ret
+SYM_FUNC_END(sm4_ce_ccm_final)
+
+.align 3
+SYM_FUNC_START(sm4_ce_ccm_enc)
+ /* input:
+ * x0: round key array, CTX
+ * x1: dst
+ * x2: src
+ * x3: ctr (big endian, 128 bit)
+ * w4: nbytes
+ * x5: mac
+ */
+ SM4_PREPARE(x0)
+
+ ldp x7, x8, [x3]
+ rev x7, x7
+ rev x8, x8
+
+ ld1 {RMAC.16b}, [x5]
+
+.Lccm_enc_loop_4x:
+ cmp w4, #(4 * 16)
+ blt .Lccm_enc_loop_1x
+
+ sub w4, w4, #(4 * 16)
+
+ /* construct CTRs */
+ inc_le128(v8) /* +0 */
+ inc_le128(v9) /* +1 */
+ inc_le128(v10) /* +2 */
+ inc_le128(v11) /* +3 */
+
+ ld1 {v0.16b-v3.16b}, [x2], #64
+
+ SM4_CRYPT_BLK2(v8, RMAC)
+ eor v8.16b, v8.16b, v0.16b
+ eor RMAC.16b, RMAC.16b, v0.16b
+ SM4_CRYPT_BLK2(v9, RMAC)
+ eor v9.16b, v9.16b, v1.16b
+ eor RMAC.16b, RMAC.16b, v1.16b
+ SM4_CRYPT_BLK2(v10, RMAC)
+ eor v10.16b, v10.16b, v2.16b
+ eor RMAC.16b, RMAC.16b, v2.16b
+ SM4_CRYPT_BLK2(v11, RMAC)
+ eor v11.16b, v11.16b, v3.16b
+ eor RMAC.16b, RMAC.16b, v3.16b
+
+ st1 {v8.16b-v11.16b}, [x1], #64
+
+ cbz w4, .Lccm_enc_end
+ b .Lccm_enc_loop_4x
+
+.Lccm_enc_loop_1x:
+ cmp w4, #16
+ blt .Lccm_enc_tail
+
+ sub w4, w4, #16
+
+ /* construct CTRs */
+ inc_le128(v8)
+
+ ld1 {v0.16b}, [x2], #16
+
+ SM4_CRYPT_BLK2(v8, RMAC)
+ eor v8.16b, v8.16b, v0.16b
+ eor RMAC.16b, RMAC.16b, v0.16b
+
+ st1 {v8.16b}, [x1], #16
+
+ cbz w4, .Lccm_enc_end
+ b .Lccm_enc_loop_1x
+
+.Lccm_enc_tail:
+ /* construct CTRs */
+ inc_le128(v8)
+
+ SM4_CRYPT_BLK2(RMAC, v8)
+
+ /* store new MAC */
+ st1 {RMAC.16b}, [x5]
+
+.Lccm_enc_tail_loop:
+ ldrb w0, [x2], #1 /* get 1 byte from input */
+ umov w9, v8.b[0] /* get top crypted CTR byte */
+ umov w6, RMAC.b[0] /* get top MAC byte */
+
+ eor w9, w9, w0 /* w9 = CTR ^ input */
+ eor w6, w6, w0 /* w6 = MAC ^ input */
+
+ strb w9, [x1], #1 /* store out byte */
+ strb w6, [x5], #1 /* store MAC byte */
+
+ subs w4, w4, #1
+ beq .Lccm_enc_ret
+
+ /* shift out one byte */
+ ext RMAC.16b, RMAC.16b, RMAC.16b, #1
+ ext v8.16b, v8.16b, v8.16b, #1
+
+ b .Lccm_enc_tail_loop
+
+.Lccm_enc_end:
+ /* store new MAC */
+ st1 {RMAC.16b}, [x5]
+
+ /* store new CTR */
+ rev x7, x7
+ rev x8, x8
+ stp x7, x8, [x3]
+
+.Lccm_enc_ret:
+ ret
+SYM_FUNC_END(sm4_ce_ccm_enc)
+
+.align 3
+SYM_FUNC_START(sm4_ce_ccm_dec)
+ /* input:
+ * x0: round key array, CTX
+ * x1: dst
+ * x2: src
+ * x3: ctr (big endian, 128 bit)
+ * w4: nbytes
+ * x5: mac
+ */
+ SM4_PREPARE(x0)
+
+ ldp x7, x8, [x3]
+ rev x7, x7
+ rev x8, x8
+
+ ld1 {RMAC.16b}, [x5]
+
+.Lccm_dec_loop_4x:
+ cmp w4, #(4 * 16)
+ blt .Lccm_dec_loop_1x
+
+ sub w4, w4, #(4 * 16)
+
+ /* construct CTRs */
+ inc_le128(v8) /* +0 */
+ inc_le128(v9) /* +1 */
+ inc_le128(v10) /* +2 */
+ inc_le128(v11) /* +3 */
+
+ ld1 {v0.16b-v3.16b}, [x2], #64
+
+ SM4_CRYPT_BLK2(v8, RMAC)
+ eor v8.16b, v8.16b, v0.16b
+ eor RMAC.16b, RMAC.16b, v8.16b
+ SM4_CRYPT_BLK2(v9, RMAC)
+ eor v9.16b, v9.16b, v1.16b
+ eor RMAC.16b, RMAC.16b, v9.16b
+ SM4_CRYPT_BLK2(v10, RMAC)
+ eor v10.16b, v10.16b, v2.16b
+ eor RMAC.16b, RMAC.16b, v10.16b
+ SM4_CRYPT_BLK2(v11, RMAC)
+ eor v11.16b, v11.16b, v3.16b
+ eor RMAC.16b, RMAC.16b, v11.16b
+
+ st1 {v8.16b-v11.16b}, [x1], #64
+
+ cbz w4, .Lccm_dec_end
+ b .Lccm_dec_loop_4x
+
+.Lccm_dec_loop_1x:
+ cmp w4, #16
+ blt .Lccm_dec_tail
+
+ sub w4, w4, #16
+
+ /* construct CTRs */
+ inc_le128(v8)
+
+ ld1 {v0.16b}, [x2], #16
+
+ SM4_CRYPT_BLK2(v8, RMAC)
+ eor v8.16b, v8.16b, v0.16b
+ eor RMAC.16b, RMAC.16b, v8.16b
+
+ st1 {v8.16b}, [x1], #16
+
+ cbz w4, .Lccm_dec_end
+ b .Lccm_dec_loop_1x
+
+.Lccm_dec_tail:
+ /* construct CTRs */
+ inc_le128(v8)
+
+ SM4_CRYPT_BLK2(RMAC, v8)
+
+ /* store new MAC */
+ st1 {RMAC.16b}, [x5]
+
+.Lccm_dec_tail_loop:
+ ldrb w0, [x2], #1 /* get 1 byte from input */
+ umov w9, v8.b[0] /* get top crypted CTR byte */
+ umov w6, RMAC.b[0] /* get top MAC byte */
+
+ eor w9, w9, w0 /* w9 = CTR ^ input */
+ eor w6, w6, w9 /* w6 = MAC ^ output */
+
+ strb w9, [x1], #1 /* store out byte */
+ strb w6, [x5], #1 /* store MAC byte */
+
+ subs w4, w4, #1
+ beq .Lccm_dec_ret
+
+ /* shift out one byte */
+ ext RMAC.16b, RMAC.16b, RMAC.16b, #1
+ ext v8.16b, v8.16b, v8.16b, #1
+
+ b .Lccm_dec_tail_loop
+
+.Lccm_dec_end:
+ /* store new MAC */
+ st1 {RMAC.16b}, [x5]
+
+ /* store new CTR */
+ rev x7, x7
+ rev x8, x8
+ stp x7, x8, [x3]
+
+.Lccm_dec_ret:
+ ret
+SYM_FUNC_END(sm4_ce_ccm_dec)
--- /dev/null
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * SM4-CCM AEAD Algorithm using ARMv8 Crypto Extensions
+ * as specified in rfc8998
+ * https://datatracker.ietf.org/doc/html/rfc8998
+ *
+ * Copyright (C) 2022 Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
+ */
+
+#include <linux/module.h>
+#include <linux/crypto.h>
+#include <linux/kernel.h>
+#include <linux/cpufeature.h>
+#include <asm/neon.h>
+#include <crypto/scatterwalk.h>
+#include <crypto/internal/aead.h>
+#include <crypto/internal/skcipher.h>
+#include <crypto/sm4.h>
+#include "sm4-ce.h"
+
+asmlinkage void sm4_ce_cbcmac_update(const u32 *rkey_enc, u8 *mac,
+ const u8 *src, unsigned int nblocks);
+asmlinkage void sm4_ce_ccm_enc(const u32 *rkey_enc, u8 *dst, const u8 *src,
+ u8 *iv, unsigned int nbytes, u8 *mac);
+asmlinkage void sm4_ce_ccm_dec(const u32 *rkey_enc, u8 *dst, const u8 *src,
+ u8 *iv, unsigned int nbytes, u8 *mac);
+asmlinkage void sm4_ce_ccm_final(const u32 *rkey_enc, u8 *iv, u8 *mac);
+
+
+static int ccm_setkey(struct crypto_aead *tfm, const u8 *key,
+ unsigned int key_len)
+{
+ struct sm4_ctx *ctx = crypto_aead_ctx(tfm);
+
+ if (key_len != SM4_KEY_SIZE)
+ return -EINVAL;
+
+ kernel_neon_begin();
+ sm4_ce_expand_key(key, ctx->rkey_enc, ctx->rkey_dec,
+ crypto_sm4_fk, crypto_sm4_ck);
+ kernel_neon_end();
+
+ return 0;
+}
+
+static int ccm_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
+{
+ if ((authsize & 1) || authsize < 4)
+ return -EINVAL;
+ return 0;
+}
+
+static int ccm_format_input(u8 info[], struct aead_request *req,
+ unsigned int msglen)
+{
+ struct crypto_aead *aead = crypto_aead_reqtfm(req);
+ unsigned int l = req->iv[0] + 1;
+ unsigned int m;
+ __be32 len;
+
+ /* verify that CCM dimension 'L': 2 <= L <= 8 */
+ if (l < 2 || l > 8)
+ return -EINVAL;
+ if (l < 4 && msglen >> (8 * l))
+ return -EOVERFLOW;
+
+ memset(&req->iv[SM4_BLOCK_SIZE - l], 0, l);
+
+ memcpy(info, req->iv, SM4_BLOCK_SIZE);
+
+ m = crypto_aead_authsize(aead);
+
+ /* format flags field per RFC 3610/NIST 800-38C */
+ *info |= ((m - 2) / 2) << 3;
+ if (req->assoclen)
+ *info |= (1 << 6);
+
+ /*
+ * format message length field,
+ * Linux uses a u32 type to represent msglen
+ */
+ if (l >= 4)
+ l = 4;
+
+ len = cpu_to_be32(msglen);
+ memcpy(&info[SM4_BLOCK_SIZE - l], (u8 *)&len + 4 - l, l);
+
+ return 0;
+}
+
+static void ccm_calculate_auth_mac(struct aead_request *req, u8 mac[])
+{
+ struct crypto_aead *aead = crypto_aead_reqtfm(req);
+ struct sm4_ctx *ctx = crypto_aead_ctx(aead);
+ struct __packed { __be16 l; __be32 h; } aadlen;
+ u32 assoclen = req->assoclen;
+ struct scatter_walk walk;
+ unsigned int len;
+
+ if (assoclen < 0xff00) {
+ aadlen.l = cpu_to_be16(assoclen);
+ len = 2;
+ } else {
+ aadlen.l = cpu_to_be16(0xfffe);
+ put_unaligned_be32(assoclen, &aadlen.h);
+ len = 6;
+ }
+
+ sm4_ce_crypt_block(ctx->rkey_enc, mac, mac);
+ crypto_xor(mac, (const u8 *)&aadlen, len);
+
+ scatterwalk_start(&walk, req->src);
+
+ do {
+ u32 n = scatterwalk_clamp(&walk, assoclen);
+ u8 *p, *ptr;
+
+ if (!n) {
+ scatterwalk_start(&walk, sg_next(walk.sg));
+ n = scatterwalk_clamp(&walk, assoclen);
+ }
+
+ p = ptr = scatterwalk_map(&walk);
+ assoclen -= n;
+ scatterwalk_advance(&walk, n);
+
+ while (n > 0) {
+ unsigned int l, nblocks;
+
+ if (len == SM4_BLOCK_SIZE) {
+ if (n < SM4_BLOCK_SIZE) {
+ sm4_ce_crypt_block(ctx->rkey_enc,
+ mac, mac);
+
+ len = 0;
+ } else {
+ nblocks = n / SM4_BLOCK_SIZE;
+ sm4_ce_cbcmac_update(ctx->rkey_enc,
+ mac, ptr, nblocks);
+
+ ptr += nblocks * SM4_BLOCK_SIZE;
+ n %= SM4_BLOCK_SIZE;
+
+ continue;
+ }
+ }
+
+ l = min(n, SM4_BLOCK_SIZE - len);
+ if (l) {
+ crypto_xor(mac + len, ptr, l);
+ len += l;
+ ptr += l;
+ n -= l;
+ }
+ }
+
+ scatterwalk_unmap(p);
+ scatterwalk_done(&walk, 0, assoclen);
+ } while (assoclen);
+}
+
+static int ccm_crypt(struct aead_request *req, struct skcipher_walk *walk,
+ u32 *rkey_enc, u8 mac[],
+ void (*sm4_ce_ccm_crypt)(const u32 *rkey_enc, u8 *dst,
+ const u8 *src, u8 *iv,
+ unsigned int nbytes, u8 *mac))
+{
+ u8 __aligned(8) ctr0[SM4_BLOCK_SIZE];
+ int err;
+
+ /* preserve the initial ctr0 for the TAG */
+ memcpy(ctr0, walk->iv, SM4_BLOCK_SIZE);
+ crypto_inc(walk->iv, SM4_BLOCK_SIZE);
+
+ kernel_neon_begin();
+
+ if (req->assoclen)
+ ccm_calculate_auth_mac(req, mac);
+
+ do {
+ unsigned int tail = walk->nbytes % SM4_BLOCK_SIZE;
+ const u8 *src = walk->src.virt.addr;
+ u8 *dst = walk->dst.virt.addr;
+
+ if (walk->nbytes == walk->total)
+ tail = 0;
+
+ if (walk->nbytes - tail)
+ sm4_ce_ccm_crypt(rkey_enc, dst, src, walk->iv,
+ walk->nbytes - tail, mac);
+
+ if (walk->nbytes == walk->total)
+ sm4_ce_ccm_final(rkey_enc, ctr0, mac);
+
+ kernel_neon_end();
+
+ if (walk->nbytes) {
+ err = skcipher_walk_done(walk, tail);
+ if (err)
+ return err;
+ if (walk->nbytes)
+ kernel_neon_begin();
+ }
+ } while (walk->nbytes > 0);
+
+ return 0;
+}
+
+static int ccm_encrypt(struct aead_request *req)
+{
+ struct crypto_aead *aead = crypto_aead_reqtfm(req);
+ struct sm4_ctx *ctx = crypto_aead_ctx(aead);
+ u8 __aligned(8) mac[SM4_BLOCK_SIZE];
+ struct skcipher_walk walk;
+ int err;
+
+ err = ccm_format_input(mac, req, req->cryptlen);
+ if (err)
+ return err;
+
+ err = skcipher_walk_aead_encrypt(&walk, req, false);
+ if (err)
+ return err;
+
+ err = ccm_crypt(req, &walk, ctx->rkey_enc, mac, sm4_ce_ccm_enc);
+ if (err)
+ return err;
+
+ /* copy authtag to end of dst */
+ scatterwalk_map_and_copy(mac, req->dst, req->assoclen + req->cryptlen,
+ crypto_aead_authsize(aead), 1);
+
+ return 0;
+}
+
+static int ccm_decrypt(struct aead_request *req)
+{
+ struct crypto_aead *aead = crypto_aead_reqtfm(req);
+ unsigned int authsize = crypto_aead_authsize(aead);
+ struct sm4_ctx *ctx = crypto_aead_ctx(aead);
+ u8 __aligned(8) mac[SM4_BLOCK_SIZE];
+ u8 authtag[SM4_BLOCK_SIZE];
+ struct skcipher_walk walk;
+ int err;
+
+ err = ccm_format_input(mac, req, req->cryptlen - authsize);
+ if (err)
+ return err;
+
+ err = skcipher_walk_aead_decrypt(&walk, req, false);
+ if (err)
+ return err;
+
+ err = ccm_crypt(req, &walk, ctx->rkey_enc, mac, sm4_ce_ccm_dec);
+ if (err)
+ return err;
+
+ /* compare calculated auth tag with the stored one */
+ scatterwalk_map_and_copy(authtag, req->src,
+ req->assoclen + req->cryptlen - authsize,
+ authsize, 0);
+
+ if (crypto_memneq(authtag, mac, authsize))
+ return -EBADMSG;
+
+ return 0;
+}
+
+static struct aead_alg sm4_ccm_alg = {
+ .base = {
+ .cra_name = "ccm(sm4)",
+ .cra_driver_name = "ccm-sm4-ce",
+ .cra_priority = 400,
+ .cra_blocksize = 1,
+ .cra_ctxsize = sizeof(struct sm4_ctx),
+ .cra_module = THIS_MODULE,
+ },
+ .ivsize = SM4_BLOCK_SIZE,
+ .chunksize = SM4_BLOCK_SIZE,
+ .maxauthsize = SM4_BLOCK_SIZE,
+ .setkey = ccm_setkey,
+ .setauthsize = ccm_setauthsize,
+ .encrypt = ccm_encrypt,
+ .decrypt = ccm_decrypt,
+};
+
+static int __init sm4_ce_ccm_init(void)
+{
+ return crypto_register_aead(&sm4_ccm_alg);
+}
+
+static void __exit sm4_ce_ccm_exit(void)
+{
+ crypto_unregister_aead(&sm4_ccm_alg);
+}
+
+module_cpu_feature_match(SM4, sm4_ce_ccm_init);
+module_exit(sm4_ce_ccm_exit);
+
+MODULE_DESCRIPTION("Synchronous SM4 in CCM mode using ARMv8 Crypto Extensions");
+MODULE_ALIAS_CRYPTO("ccm(sm4)");
+MODULE_AUTHOR("Tianjia Zhang <tianjia.zhang@linux.alibaba.com>");
+MODULE_LICENSE("GPL v2");
projects / users / dwmw2 / linux.git / commitdiff