1 files changed, 112 insertions, 0 deletions
diff --git a/include/crypto/sm3_base.h b/include/crypto/sm3_base.h
new file mode 100644
index 000000000..2f3a32ab9
--- /dev/null
+++ b/include/crypto/sm3_base.h
@@ -0,0 +1,112 @@
+/* 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/crypto.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <asm/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)
+{
+	struct sm3_state *sctx = shash_desc_ctx(desc);
+
+	sctx->state[0] = SM3_IVA;
+	sctx->state[1] = SM3_IVB;
+	sctx->state[2] = SM3_IVC;
+	sctx->state[3] = SM3_IVD;
+	sctx->state[4] = SM3_IVE;
+	sctx->state[5] = SM3_IVF;
+	sctx->state[6] = SM3_IVG;
+	sctx->state[7] = SM3_IVH;
+	sctx->count = 0;
+
+	return 0;
+}
+
+static inline int sm3_base_do_update(struct shash_desc *desc,
+				      const u8 *data,
+				      unsigned int len,
+				      sm3_block_fn *block_fn)
+{
+	struct sm3_state *sctx = shash_desc_ctx(desc);
+	unsigned int partial = sctx->count % SM3_BLOCK_SIZE;
+
+	sctx->count += len;
+
+	if (unlikely((partial + len) >= SM3_BLOCK_SIZE)) {
+		int blocks;
+
+		if (partial) {
+			int p = SM3_BLOCK_SIZE - partial;
+
+			memcpy(sctx->buffer + partial, data, p);
+			data += p;
+			len -= p;
+
+			block_fn(sctx, sctx->buffer, 1);
+		}
+
+		blocks = len / SM3_BLOCK_SIZE;
+		len %= SM3_BLOCK_SIZE;
+
+		if (blocks) {
+			block_fn(sctx, data, blocks);
+			data += blocks * SM3_BLOCK_SIZE;
+		}
+		partial = 0;
+	}
+	if (len)
+		memcpy(sctx->buffer + partial, data, len);
+
+	return 0;
+}
+
+static inline int sm3_base_do_finalize(struct shash_desc *desc,
+					sm3_block_fn *block_fn)
+{
+	const int bit_offset = SM3_BLOCK_SIZE - sizeof(__be64);
+	struct sm3_state *sctx = shash_desc_ctx(desc);
+	__be64 *bits = (__be64 *)(sctx->buffer + bit_offset);
+	unsigned int partial = sctx->count % SM3_BLOCK_SIZE;
+
+	sctx->buffer[partial++] = 0x80;
+	if (partial > bit_offset) {
+		memset(sctx->buffer + partial, 0x0, SM3_BLOCK_SIZE - partial);
+		partial = 0;
+
+		block_fn(sctx, sctx->buffer, 1);
+	}
+
+	memset(sctx->buffer + partial, 0x0, bit_offset - partial);
+	*bits = cpu_to_be64(sctx->count << 3);
+	block_fn(sctx, sctx->buffer, 1);
+
+	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++);
+
+	memzero_explicit(sctx, sizeof(*sctx));
+	return 0;
+}
+
+#endif /* _CRYPTO_SM3_BASE_H */