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authorArd Biesheuvel <ardb@kernel.org>2019-11-08 13:22:21 +0100
committerHerbert Xu <herbert@gondor.apana.org.au>2019-11-17 09:02:41 +0800
commita1d93064094cc5e24d64e35cf093e7191d0c9344 (patch)
tree9ad12ad3cad4006d7f348dec1e69d308163e7a66 /crypto/poly1305_generic.c
parentcrypto: x86/poly1305 - unify Poly1305 state struct with generic code (diff)
downloadlinux-dev-a1d93064094cc5e24d64e35cf093e7191d0c9344.tar.xz
linux-dev-a1d93064094cc5e24d64e35cf093e7191d0c9344.zip
crypto: poly1305 - expose init/update/final library interface
Expose the existing generic Poly1305 code via a init/update/final library interface so that callers are not required to go through the crypto API's shash abstraction to access it. At the same time, make some preparations so that the library implementation can be superseded by an accelerated arch-specific version in the future. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/poly1305_generic.c')
-rw-r--r--crypto/poly1305_generic.c22
1 files changed, 1 insertions, 21 deletions
diff --git a/crypto/poly1305_generic.c b/crypto/poly1305_generic.c
index f3fcd9578a47..afe9a9e576dd 100644
--- a/crypto/poly1305_generic.c
+++ b/crypto/poly1305_generic.c
@@ -85,31 +85,11 @@ EXPORT_SYMBOL_GPL(crypto_poly1305_update);
int crypto_poly1305_final(struct shash_desc *desc, u8 *dst)
{
struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
- __le32 digest[4];
- u64 f = 0;
if (unlikely(!dctx->sset))
return -ENOKEY;
- if (unlikely(dctx->buflen)) {
- dctx->buf[dctx->buflen++] = 1;
- memset(dctx->buf + dctx->buflen, 0,
- POLY1305_BLOCK_SIZE - dctx->buflen);
- poly1305_core_blocks(&dctx->h, dctx->r, dctx->buf, 1, 0);
- }
-
- poly1305_core_emit(&dctx->h, digest);
-
- /* mac = (h + s) % (2^128) */
- f = (f >> 32) + le32_to_cpu(digest[0]) + dctx->s[0];
- put_unaligned_le32(f, dst + 0);
- f = (f >> 32) + le32_to_cpu(digest[1]) + dctx->s[1];
- put_unaligned_le32(f, dst + 4);
- f = (f >> 32) + le32_to_cpu(digest[2]) + dctx->s[2];
- put_unaligned_le32(f, dst + 8);
- f = (f >> 32) + le32_to_cpu(digest[3]) + dctx->s[3];
- put_unaligned_le32(f, dst + 12);
-
+ poly1305_final_generic(dctx, dst);
return 0;
}
EXPORT_SYMBOL_GPL(crypto_poly1305_final);