From: Andy Lutomirski <luto@xxxxxxxxxx>
I want to expose a minimal SHA256 API that can be used without the
depending on the crypto core. To prepare for this, factor out the
meat of the sha256_base_*() helpers.
Cc: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx>
---
include/crypto/sha256_base.h | 53 ++++++++++++++++++++++++------------
1 file changed, 36 insertions(+), 17 deletions(-)
diff --git a/include/crypto/sha256_base.h b/include/crypto/sha256_base.h
index 59159bc944f5..5317946a813a 100644
--- a/include/crypto/sha256_base.h
+++ b/include/crypto/sha256_base.h
@@ -15,10 +15,8 @@
typedef void (sha256_block_fn)(struct sha256_state *sst, u8 const *src,
int blocks);
-static inline int sha224_base_init(struct shash_desc *desc)
+static inline void sha224_init_direct(struct sha256_state *sctx)
{
- struct sha256_state *sctx = shash_desc_ctx(desc);
-
sctx->state[0] = SHA224_H0;
sctx->state[1] = SHA224_H1;
sctx->state[2] = SHA224_H2;
@@ -28,14 +26,16 @@ static inline int sha224_base_init(struct shash_desc *desc)
sctx->state[6] = SHA224_H6;
sctx->state[7] = SHA224_H7;
sctx->count = 0;
+}
+static inline int sha224_base_init(struct shash_desc *desc)
+{
+ sha224_init_direct(shash_desc_ctx(desc));
return 0;
}
-static inline int sha256_base_init(struct shash_desc *desc)
+static inline void sha256_init_direct(struct sha256_state *sctx)
{
- struct sha256_state *sctx = shash_desc_ctx(desc);
-
sctx->state[0] = SHA256_H0;
sctx->state[1] = SHA256_H1;
sctx->state[2] = SHA256_H2;
@@ -45,16 +45,19 @@ static inline int sha256_base_init(struct shash_desc *desc)
sctx->state[6] = SHA256_H6;
sctx->state[7] = SHA256_H7;
sctx->count = 0;
+}
+static inline int sha256_base_init(struct shash_desc *desc)
+{
+ sha256_init_direct(shash_desc_ctx(desc));
return 0;
}
-static inline int sha256_base_do_update(struct shash_desc *desc,
- const u8 *data,
- unsigned int len,
- sha256_block_fn *block_fn)
+static inline void __sha256_base_do_update(struct sha256_state *sctx,
+ const u8 *data,
+ unsigned int len,
+ sha256_block_fn *block_fn)
{
- struct sha256_state *sctx = shash_desc_ctx(desc);
unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;
sctx->count += len;
@@ -83,15 +86,21 @@ static inline int sha256_base_do_update(struct shash_desc *desc,
}
if (len)
memcpy(sctx->buf + partial, data, len);
+}
+static inline int sha256_base_do_update(struct shash_desc *desc,
+ const u8 *data,
+ unsigned int len,
+ sha256_block_fn *block_fn)
+{
+ __sha256_base_do_update(shash_desc_ctx(desc), data, len, block_fn);
return 0;
}
-static inline int sha256_base_do_finalize(struct shash_desc *desc,
- sha256_block_fn *block_fn)
+static inline void sha256_do_finalize_direct(struct sha256_state *sctx,
+ sha256_block_fn *block_fn)
{
const int bit_offset = SHA256_BLOCK_SIZE - sizeof(__be64);
- struct sha256_state *sctx = shash_desc_ctx(desc);
__be64 *bits = (__be64 *)(sctx->buf + bit_offset);
unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;
@@ -106,14 +115,18 @@ static inline int sha256_base_do_finalize(struct shash_desc *desc,
memset(sctx->buf + partial, 0x0, bit_offset - partial);
*bits = cpu_to_be64(sctx->count << 3);
block_fn(sctx, sctx->buf, 1);
+}
+static inline int sha256_base_do_finalize(struct shash_desc *desc,
+ sha256_block_fn *block_fn)
+{
+ sha256_do_finalize_direct(shash_desc_ctx(desc), block_fn);
return 0;
}
-static inline int sha256_base_finish(struct shash_desc *desc, u8 *out)
+static inline void __sha256_base_finish(struct sha256_state *sctx,
+ unsigned int digest_size, u8 *out)
{
- unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
- struct sha256_state *sctx = shash_desc_ctx(desc);
__be32 *digest = (__be32 *)out;
int i;
@@ -121,5 +134,11 @@ static inline int sha256_base_finish(struct shash_desc *desc, u8 *out)
put_unaligned_be32(sctx->state[i], digest++);
*sctx = (struct sha256_state){};
+}
+
+static inline int sha256_base_finish(struct shash_desc *desc, u8 *out)
+{
+ __sha256_base_finish(shash_desc_ctx(desc),
+ crypto_shash_digestsize(desc->tfm), out);
return 0;
}
--
2.21.0
