1 files changed, 82 insertions, 0 deletions
diff --git a/include/crypto/sm3_base.h b/include/crypto/sm3_base.h
new file mode 100644
index 000000000000..7c53570bc05e
--- /dev/null
+++ b/include/crypto/sm3_base.h
@@ -0,0 +1,82 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * sm3_base.h - core logic for SM3 implementations
+ *
+ * Copyright (C) 2017 ARM Limited or its affiliates.
+ * Written by Gilad Ben-Yossef <gilad@benyossef.com>
+ */
+
+#ifndef _CRYPTO_SM3_BASE_H
+#define _CRYPTO_SM3_BASE_H
+
+#include <crypto/internal/hash.h>
+#include <crypto/sm3.h>
+#include <linux/math.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/unaligned.h>
+
+typedef void (sm3_block_fn)(struct sm3_state *sst, u8 const *src, int blocks);
+
+static inline int sm3_base_init(struct shash_desc *desc)
+{
+	sm3_init(shash_desc_ctx(desc));
+	return 0;
+}
+
+static inline int sm3_base_do_update_blocks(struct shash_desc *desc,
+					    const u8 *data, unsigned int len,
+					    sm3_block_fn *block_fn)
+{
+	unsigned int remain = len - round_down(len, SM3_BLOCK_SIZE);
+	struct sm3_state *sctx = shash_desc_ctx(desc);
+
+	sctx->count += len - remain;
+	block_fn(sctx, data, len / SM3_BLOCK_SIZE);
+	return remain;
+}
+
+static inline int sm3_base_do_finup(struct shash_desc *desc,
+				    const u8 *src, unsigned int len,
+				    sm3_block_fn *block_fn)
+{
+	unsigned int bit_offset = SM3_BLOCK_SIZE / 8 - 1;
+	struct sm3_state *sctx = shash_desc_ctx(desc);
+	union {
+		__be64 b64[SM3_BLOCK_SIZE / 4];
+		u8 u8[SM3_BLOCK_SIZE * 2];
+	} block = {};
+
+	if (len >= SM3_BLOCK_SIZE) {
+		int remain;
+
+		remain = sm3_base_do_update_blocks(desc, src, len, block_fn);
+		src += len - remain;
+		len = remain;
+	}
+
+	if (len >= bit_offset * 8)
+		bit_offset += SM3_BLOCK_SIZE / 8;
+	memcpy(&block, src, len);
+	block.u8[len] = 0x80;
+	sctx->count += len;
+	block.b64[bit_offset] = cpu_to_be64(sctx->count << 3);
+	block_fn(sctx, block.u8, (bit_offset + 1) * 8 / SM3_BLOCK_SIZE);
+	memzero_explicit(&block, sizeof(block));
+
+	return 0;
+}
+
+static inline int sm3_base_finish(struct shash_desc *desc, u8 *out)
+{
+	struct sm3_state *sctx = shash_desc_ctx(desc);
+	__be32 *digest = (__be32 *)out;
+	int i;
+
+	for (i = 0; i < SM3_DIGEST_SIZE / sizeof(__be32); i++)
+		put_unaligned_be32(sctx->state[i], digest++);
+	return 0;
+}
+
+#endif /* _CRYPTO_SM3_BASE_H */