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crypto: lib/sha1 - rename "sha" to "sha1"

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The library implementation of the SHA-1 compression function is
confusingly called just "sha_transform()".  Alongside it are some "SHA_"
constants and "sha_init()".  Presumably these are left over from a time
when SHA just meant SHA-1.  But now there are also SHA-2 and SHA-3, and
moreover SHA-1 is now considered insecure and thus shouldn't be used.

Therefore, rename these functions and constants to make it very clear
that they are for SHA-1.  Also add a comment to make it clear that these
shouldn't be used.

For the extra-misleadingly named "SHA_MESSAGE_BYTES", rename it to
SHA1_BLOCK_SIZE and define it to just '64' rather than '(512/8)' so that
it matches the same definition in <crypto/sha.h>.  This prepares for
merging <linux/cryptohash.h> into <crypto/sha.h>.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers
2020-05-02 11:24:25 -07:00
committed by Herbert Xu
parent 4d21e59450
commit 6b0b0fa2bc
8 changed files with 43 additions and 37 deletions
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18
kernel/bpf/core.c
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@@ -262,10 +262,10 @@ void __bpf_prog_free(struct bpf_prog *fp)
int bpf_prog_calc_tag(struct bpf_prog *fp)
{
const u32 bits_offset = SHA_MESSAGE_BYTES - sizeof(__be64);
const u32 bits_offset = SHA1_BLOCK_SIZE - sizeof(__be64);
u32 raw_size = bpf_prog_tag_scratch_size(fp);
u32 digest[SHA_DIGEST_WORDS];
u32 ws[SHA_WORKSPACE_WORDS];
u32 digest[SHA1_DIGEST_WORDS];
u32 ws[SHA1_WORKSPACE_WORDS];
u32 i, bsize, psize, blocks;
struct bpf_insn *dst;
bool was_ld_map;
@@ -277,7 +277,7 @@ int bpf_prog_calc_tag(struct bpf_prog *fp)
if (!raw)
return -ENOMEM;
sha_init(digest);
sha1_init(digest);
memset(ws, 0, sizeof(ws));
/* We need to take out the map fd for the digest calculation
@@ -308,8 +308,8 @@ int bpf_prog_calc_tag(struct bpf_prog *fp)
memset(&raw[psize], 0, raw_size - psize);
raw[psize++] = 0x80;
bsize = round_up(psize, SHA_MESSAGE_BYTES);
blocks = bsize / SHA_MESSAGE_BYTES;
bsize = round_up(psize, SHA1_BLOCK_SIZE);
blocks = bsize / SHA1_BLOCK_SIZE;
todo = raw;
if (bsize - psize >= sizeof(__be64)) {
bits = (__be64 *)(todo + bsize - sizeof(__be64));
@@ -320,12 +320,12 @@ int bpf_prog_calc_tag(struct bpf_prog *fp)
*bits = cpu_to_be64((psize - 1) << 3);
while (blocks--) {
sha_transform(digest, todo, ws);
todo += SHA_MESSAGE_BYTES;
sha1_transform(digest, todo, ws);
todo += SHA1_BLOCK_SIZE;
}
result = (__force __be32 *)digest;
for (i = 0; i < SHA_DIGEST_WORDS; i++)
for (i = 0; i < SHA1_DIGEST_WORDS; i++)
result[i] = cpu_to_be32(digest[i]);
memcpy(fp->tag, result, sizeof(fp->tag));