From ee7564166da9e218c3f605ee78ff16599d4d5a05 Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Sun, 9 Jul 2006 14:49:42 +1000 Subject: [PATCH] [CRYPTO] digest: Store temporary digest in tfm When the final result location is unaligned, we store the digest in a temporary buffer before copying it to the final location. Currently that buffer sits on the stack. This patch moves it to an area in the tfm, just like the CBC IV buffer. Signed-off-by: Herbert Xu --- crypto/digest.c | 16 ++++++++++------ crypto/internal.h | 9 ++++++++- 2 files changed, 18 insertions(+), 7 deletions(-) diff --git a/crypto/digest.c b/crypto/digest.c index 0df7f392a5..19e7556377 100644 --- a/crypto/digest.c +++ b/crypto/digest.c @@ -66,14 +66,18 @@ static void update(struct crypto_tfm *tfm, static void final(struct crypto_tfm *tfm, u8 *out) { unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); + struct digest_alg *digest = &tfm->__crt_alg->cra_digest; + if (unlikely((unsigned long)out & alignmask)) { - unsigned int size = crypto_tfm_alg_digestsize(tfm); - u8 buffer[size + alignmask]; - u8 *dst = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); - tfm->__crt_alg->cra_digest.dia_final(tfm, dst); - memcpy(out, dst, size); + unsigned long align = alignmask + 1; + unsigned long addr = (unsigned long)crypto_tfm_ctx(tfm); + u8 *dst = (u8 *)ALIGN(addr, align) + + ALIGN(tfm->__crt_alg->cra_ctxsize, align); + + digest->dia_final(tfm, dst); + memcpy(out, dst, digest->dia_digestsize); } else - tfm->__crt_alg->cra_digest.dia_final(tfm, out); + digest->dia_final(tfm, out); } static int nosetkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) diff --git a/crypto/internal.h b/crypto/internal.h index 03c00b0e6b..b110b979b9 100644 --- a/crypto/internal.h +++ b/crypto/internal.h @@ -99,7 +99,14 @@ static inline void crypto_exit_proc(void) static inline unsigned int crypto_digest_ctxsize(struct crypto_alg *alg, int flags) { - return alg->cra_ctxsize; + unsigned int len = alg->cra_ctxsize; + + if (alg->cra_alignmask) { + len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1); + len += alg->cra_digest.dia_digestsize; + } + + return len; } static inline unsigned int crypto_cipher_ctxsize(struct crypto_alg *alg, -- 2.39.5