crypto: sha256 - implement base layer for SHA-256

To reduce the number of copies of boilerplate code throughout
the tree, this patch implements generic glue for the SHA-256
algorithm. This allows a specific arch or hardware implementation
to only implement the special handling that it needs.

The users need to supply an implementation of

  void (sha256_block_fn)(struct sha256_state *sst, u8 const *src, int blocks)

and pass it to the SHA-256 base functions. For easy casting between the
prototype above and existing block functions that take a 'u32 state[]'
as their first argument, the 'state' member of struct sha256_state is
moved to the base of the struct.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

2 files changed, 129 insertions, 1 deletions

diff --git a/include/crypto/sha.h b/include/crypto/sha.h
index a9aad8e63f43..a75bc80cc776 100644
--- a/include/crypto/sha.h
+++ b/include/crypto/sha.h
@@ -71,8 +71,8 @@ struct sha1_state {
 };
 
 struct sha256_state {
-        u64 count;
         u32 state[SHA256_DIGEST_SIZE / 4];
+        u64 count;
         u8 buf[SHA256_BLOCK_SIZE];
 };
 
diff --git a/include/crypto/sha256_base.h b/include/crypto/sha256_base.h
new file mode 100644
index 000000000000..d1f2195bb7de
--- /dev/null
+++ b/include/crypto/sha256_base.h
@@ -0,0 +1,128 @@
+/*
+ * sha256_base.h - core logic for SHA-256 implementations
+ *
+ * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <crypto/internal/hash.h>
+#include <crypto/sha.h>
+#include <linux/crypto.h>
+#include <linux/module.h>
+
+#include <asm/unaligned.h>
+
+typedef void (sha256_block_fn)(struct sha256_state *sst, u8 const *src,
+                               int blocks);
+
+static inline int sha224_base_init(struct shash_desc *desc)
+{
+        struct sha256_state *sctx = shash_desc_ctx(desc);
+
+        sctx->state[0] = SHA224_H0;
+        sctx->state[1] = SHA224_H1;
+        sctx->state[2] = SHA224_H2;
+        sctx->state[3] = SHA224_H3;
+        sctx->state[4] = SHA224_H4;
+        sctx->state[5] = SHA224_H5;
+        sctx->state[6] = SHA224_H6;
+        sctx->state[7] = SHA224_H7;
+        sctx->count = 0;
+
+        return 0;
+}
+
+static inline int sha256_base_init(struct shash_desc *desc)
+{
+        struct sha256_state *sctx = shash_desc_ctx(desc);
+
+        sctx->state[0] = SHA256_H0;
+        sctx->state[1] = SHA256_H1;
+        sctx->state[2] = SHA256_H2;
+        sctx->state[3] = SHA256_H3;
+        sctx->state[4] = SHA256_H4;
+        sctx->state[5] = SHA256_H5;
+        sctx->state[6] = SHA256_H6;
+        sctx->state[7] = SHA256_H7;
+        sctx->count = 0;
+
+        return 0;
+}
+
+static inline int sha256_base_do_update(struct shash_desc *desc,
+                                        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;
+
+        if (unlikely((partial + len) >= SHA256_BLOCK_SIZE)) {
+                int blocks;
+
+                if (partial) {
+                        int p = SHA256_BLOCK_SIZE - partial;
+
+                        memcpy(sctx->buf + partial, data, p);
+                        data += p;
+                        len -= p;
+
+                        block_fn(sctx, sctx->buf, 1);
+                }
+
+                blocks = len / SHA256_BLOCK_SIZE;
+                len %= SHA256_BLOCK_SIZE;
+
+                if (blocks) {
+                        block_fn(sctx, data, blocks);
+                        data += blocks * SHA256_BLOCK_SIZE;
+                }
+                partial = 0;
+        }
+        if (len)
+                memcpy(sctx->buf + partial, data, len);
+
+        return 0;
+}
+
+static inline int sha256_base_do_finalize(struct shash_desc *desc,
+                                          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;
+
+        sctx->buf[partial++] = 0x80;
+        if (partial > bit_offset) {
+                memset(sctx->buf + partial, 0x0, SHA256_BLOCK_SIZE - partial);
+                partial = 0;
+
+                block_fn(sctx, sctx->buf, 1);
+        }
+
+        memset(sctx->buf + partial, 0x0, bit_offset - partial);
+        *bits = cpu_to_be64(sctx->count << 3);
+        block_fn(sctx, sctx->buf, 1);
+
+        return 0;
+}
+
+static inline int sha256_base_finish(struct shash_desc *desc, 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;
+
+        for (i = 0; digest_size > 0; i++, digest_size -= sizeof(__be32))
+                put_unaligned_be32(sctx->state[i], digest++);
+
+        *sctx = (struct sha256_state){};
+        return 0;
+}