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-rw-r--r--include/crypto/sm3_base.h112
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 */