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crypto: sha512 - Move message schedule W[80] to static percpu area

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The message schedule W (u64[80]) is too big for the stack. In order
for this algorithm to be used with shash it is moved to a static
percpu area.

Signed-off-by: Adrian-Ken Rueegsegger <ken@codelabs.ch>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Adrian-Ken Rueegsegger 2008-12-17 16:47:52 +11:00 committed by Herbert Xu
parent 19e2bf1467
commit f9e2bca6c2
1 changed files with 9 additions and 8 deletions
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17
crypto/sha512_generic.c
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@ -18,16 +18,17 @@
#include <linux/crypto.h> #include <linux/crypto.h>
#include <linux/types.h> #include <linux/types.h>
#include <crypto/sha.h> #include <crypto/sha.h>
#include <linux/percpu.h>
#include <asm/byteorder.h> #include <asm/byteorder.h>
struct sha512_ctx { struct sha512_ctx {
u64 state[8]; u64 state[8];
u32 count[4]; u32 count[4];
u8 buf[128]; u8 buf[128];
u64 W[80];
}; };
static DEFINE_PER_CPU(u64[80], msg_schedule);
static inline u64 Ch(u64 x, u64 y, u64 z) static inline u64 Ch(u64 x, u64 y, u64 z)
{ {
return z ^ (x & (y ^ z)); return z ^ (x & (y ^ z));
@ -89,11 +90,12 @@ static inline void BLEND_OP(int I, u64 *W)
} }
static void static void
sha512_transform(u64 *state, u64 *W, const u8 *input) sha512_transform(u64 *state, const u8 *input)
{ {
u64 a, b, c, d, e, f, g, h, t1, t2; u64 a, b, c, d, e, f, g, h, t1, t2;
int i; int i;
u64 *W = get_cpu_var(msg_schedule);
/* load the input */ /* load the input */
for (i = 0; i < 16; i++) for (i = 0; i < 16; i++)
@ -132,6 +134,8 @@ sha512_transform(u64 *state, u64 *W, const u8 *input)
/* erase our data */ /* erase our data */
a = b = c = d = e = f = g = h = t1 = t2 = 0; a = b = c = d = e = f = g = h = t1 = t2 = 0;
memset(W, 0, sizeof(__get_cpu_var(msg_schedule)));
put_cpu_var(msg_schedule);
} }
static void static void
@ -187,10 +191,10 @@ sha512_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
/* Transform as many times as possible. */ /* Transform as many times as possible. */
if (len >= part_len) { if (len >= part_len) {
memcpy(&sctx->buf[index], data, part_len); memcpy(&sctx->buf[index], data, part_len);
sha512_transform(sctx->state, sctx->W, sctx->buf); sha512_transform(sctx->state, sctx->buf);
for (i = part_len; i + 127 < len; i+=128) for (i = part_len; i + 127 < len; i+=128)
sha512_transform(sctx->state, sctx->W, &data[i]); sha512_transform(sctx->state, &data[i]);
index = 0; index = 0;
} else { } else {
@ -199,9 +203,6 @@ sha512_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
/* Buffer remaining input */ /* Buffer remaining input */
memcpy(&sctx->buf[index], &data[i], len - i); memcpy(&sctx->buf[index], &data[i], len - i);
/* erase our data */
memset(sctx->W, 0, sizeof(sctx->W));
} }
static void static void