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crypto: poly1305 - Use unaligned access where required 

By using the unaligned access helpers, we drastically improve
performance on small MIPS routers that have to go through the exception
fix-up handler for these unaligned accesses.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Eric Biggers <ebiggers@google.com>
Acked-by: Martin Willi <martin@strongswan.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Jason A. Donenfeld 2016-11-07 20:47:09 +01:00 committed by Herbert Xu
parent 650d4a9782
commit 109e23bd10
1 changed files with 15 additions and 19 deletions
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34
crypto/poly1305_generic.c
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@ -17,6 +17,7 @@
#include <linux/crypto.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <asm/unaligned.h>
static inline u64 mlt(u64 a, u64 b)
{
@ -33,11 +34,6 @@ static inline u32 and(u32 v, u32 mask)
return v & mask;
}
static inline u32 le32_to_cpuvp(const void *p)
{
return le32_to_cpup(p);
}
int crypto_poly1305_init(struct shash_desc *desc)
{
struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
@ -65,19 +61,19 @@ EXPORT_SYMBOL_GPL(crypto_poly1305_setkey);
static void poly1305_setrkey(struct poly1305_desc_ctx *dctx, const u8 *key)
{
/* r &= 0xffffffc0ffffffc0ffffffc0fffffff */
dctx->r[0] = (le32_to_cpuvp(key + 0) >> 0) & 0x3ffffff;
dctx->r[1] = (le32_to_cpuvp(key + 3) >> 2) & 0x3ffff03;
dctx->r[2] = (le32_to_cpuvp(key + 6) >> 4) & 0x3ffc0ff;
dctx->r[3] = (le32_to_cpuvp(key + 9) >> 6) & 0x3f03fff;
dctx->r[4] = (le32_to_cpuvp(key + 12) >> 8) & 0x00fffff;
dctx->r[0] = (get_unaligned_le32(key + 0) >> 0) & 0x3ffffff;
dctx->r[1] = (get_unaligned_le32(key + 3) >> 2) & 0x3ffff03;
dctx->r[2] = (get_unaligned_le32(key + 6) >> 4) & 0x3ffc0ff;
dctx->r[3] = (get_unaligned_le32(key + 9) >> 6) & 0x3f03fff;
dctx->r[4] = (get_unaligned_le32(key + 12) >> 8) & 0x00fffff;
}
static void poly1305_setskey(struct poly1305_desc_ctx *dctx, const u8 *key)
{
dctx->s[0] = le32_to_cpuvp(key + 0);
dctx->s[1] = le32_to_cpuvp(key + 4);
dctx->s[2] = le32_to_cpuvp(key + 8);
dctx->s[3] = le32_to_cpuvp(key + 12);
dctx->s[0] = get_unaligned_le32(key + 0);
dctx->s[1] = get_unaligned_le32(key + 4);
dctx->s[2] = get_unaligned_le32(key + 8);
dctx->s[3] = get_unaligned_le32(key + 12);
}
unsigned int crypto_poly1305_setdesckey(struct poly1305_desc_ctx *dctx,
@ -137,11 +133,11 @@ static unsigned int poly1305_blocks(struct poly1305_desc_ctx *dctx,
while (likely(srclen >= POLY1305_BLOCK_SIZE)) {
/* h += m[i] */
h0 += (le32_to_cpuvp(src + 0) >> 0) & 0x3ffffff;
h1 += (le32_to_cpuvp(src + 3) >> 2) & 0x3ffffff;
h2 += (le32_to_cpuvp(src + 6) >> 4) & 0x3ffffff;
h3 += (le32_to_cpuvp(src + 9) >> 6) & 0x3ffffff;
h4 += (le32_to_cpuvp(src + 12) >> 8) | hibit;
h0 += (get_unaligned_le32(src + 0) >> 0) & 0x3ffffff;
h1 += (get_unaligned_le32(src + 3) >> 2) & 0x3ffffff;
h2 += (get_unaligned_le32(src + 6) >> 4) & 0x3ffffff;
h3 += (get_unaligned_le32(src + 9) >> 6) & 0x3ffffff;
h4 += (get_unaligned_le32(src + 12) >> 8) | hibit;
/* h *= r */
d0 = mlt(h0, r0) + mlt(h1, s4) + mlt(h2, s3) +