2 files changed, 44 insertions, 2 deletions
diff --git a/include/crypto/sm3.h b/include/crypto/sm3.h
index d49211ba9a20..6dc95264a836 100644
--- a/include/crypto/sm3.h
+++ b/include/crypto/sm3.h
@@ -14,6 +14,7 @@
 
 #define SM3_DIGEST_SIZE	32
 #define SM3_BLOCK_SIZE	64
+#define SM3_STATE_SIZE	40
 
 #define SM3_T1		0x79CC4519
 #define SM3_T2		0x7A879D8A
diff --git a/include/crypto/sm3_base.h b/include/crypto/sm3_base.h
index 835896228e8e..9460589c8cb8 100644
--- a/include/crypto/sm3_base.h
+++ b/include/crypto/sm3_base.h
@@ -62,6 +62,49 @@ static inline int sm3_base_do_update(struct shash_desc *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_do_finalize(struct shash_desc *desc,
 					sm3_block_fn *block_fn)
 {
@@ -93,8 +136,6 @@ static inline int sm3_base_finish(struct shash_desc *desc, u8 *out)
 
 	for (i = 0; i < SM3_DIGEST_SIZE / sizeof(__be32); i++)
 		put_unaligned_be32(sctx->state[i], digest++);
-
-	memzero_explicit(sctx, sizeof(*sctx));
 	return 0;
 }