diff options
Diffstat (limited to 'crypto/hmac.c')
| -rw-r--r-- | crypto/hmac.c | 56 |
1 files changed, 22 insertions, 34 deletions
diff --git a/crypto/hmac.c b/crypto/hmac.c index ea93f4c55f25..7cec25ff9889 100644 --- a/crypto/hmac.c +++ b/crypto/hmac.c @@ -24,31 +24,20 @@ struct hmac_ctx { struct crypto_shash *hash; + /* Contains 'u8 ipad[statesize];', then 'u8 opad[statesize];' */ + u8 pads[]; }; -static inline void *align_ptr(void *p, unsigned int align) -{ - return (void *)ALIGN((unsigned long)p, align); -} - -static inline struct hmac_ctx *hmac_ctx(struct crypto_shash *tfm) -{ - return align_ptr(crypto_shash_ctx_aligned(tfm) + - crypto_shash_statesize(tfm) * 2, - crypto_tfm_ctx_alignment()); -} - static int hmac_setkey(struct crypto_shash *parent, const u8 *inkey, unsigned int keylen) { int bs = crypto_shash_blocksize(parent); int ds = crypto_shash_digestsize(parent); int ss = crypto_shash_statesize(parent); - char *ipad = crypto_shash_ctx_aligned(parent); - char *opad = ipad + ss; - struct hmac_ctx *ctx = align_ptr(opad + ss, - crypto_tfm_ctx_alignment()); - struct crypto_shash *hash = ctx->hash; + struct hmac_ctx *tctx = crypto_shash_ctx(parent); + struct crypto_shash *hash = tctx->hash; + u8 *ipad = &tctx->pads[0]; + u8 *opad = &tctx->pads[ss]; SHASH_DESC_ON_STACK(shash, hash); unsigned int i; @@ -94,16 +83,18 @@ static int hmac_export(struct shash_desc *pdesc, void *out) static int hmac_import(struct shash_desc *pdesc, const void *in) { struct shash_desc *desc = shash_desc_ctx(pdesc); - struct hmac_ctx *ctx = hmac_ctx(pdesc->tfm); + const struct hmac_ctx *tctx = crypto_shash_ctx(pdesc->tfm); - desc->tfm = ctx->hash; + desc->tfm = tctx->hash; return crypto_shash_import(desc, in); } static int hmac_init(struct shash_desc *pdesc) { - return hmac_import(pdesc, crypto_shash_ctx_aligned(pdesc->tfm)); + const struct hmac_ctx *tctx = crypto_shash_ctx(pdesc->tfm); + + return hmac_import(pdesc, &tctx->pads[0]); } static int hmac_update(struct shash_desc *pdesc, @@ -119,7 +110,8 @@ static int hmac_final(struct shash_desc *pdesc, u8 *out) struct crypto_shash *parent = pdesc->tfm; int ds = crypto_shash_digestsize(parent); int ss = crypto_shash_statesize(parent); - char *opad = crypto_shash_ctx_aligned(parent) + ss; + const struct hmac_ctx *tctx = crypto_shash_ctx(parent); + const u8 *opad = &tctx->pads[ss]; struct shash_desc *desc = shash_desc_ctx(pdesc); return crypto_shash_final(desc, out) ?: @@ -134,7 +126,8 @@ static int hmac_finup(struct shash_desc *pdesc, const u8 *data, struct crypto_shash *parent = pdesc->tfm; int ds = crypto_shash_digestsize(parent); int ss = crypto_shash_statesize(parent); - char *opad = crypto_shash_ctx_aligned(parent) + ss; + const struct hmac_ctx *tctx = crypto_shash_ctx(parent); + const u8 *opad = &tctx->pads[ss]; struct shash_desc *desc = shash_desc_ctx(pdesc); return crypto_shash_finup(desc, data, nbytes, out) ?: @@ -147,7 +140,7 @@ static int hmac_init_tfm(struct crypto_shash *parent) struct crypto_shash *hash; struct shash_instance *inst = shash_alg_instance(parent); struct crypto_shash_spawn *spawn = shash_instance_ctx(inst); - struct hmac_ctx *ctx = hmac_ctx(parent); + struct hmac_ctx *tctx = crypto_shash_ctx(parent); hash = crypto_spawn_shash(spawn); if (IS_ERR(hash)) @@ -156,14 +149,14 @@ static int hmac_init_tfm(struct crypto_shash *parent) parent->descsize = sizeof(struct shash_desc) + crypto_shash_descsize(hash); - ctx->hash = hash; + tctx->hash = hash; return 0; } static int hmac_clone_tfm(struct crypto_shash *dst, struct crypto_shash *src) { - struct hmac_ctx *sctx = hmac_ctx(src); - struct hmac_ctx *dctx = hmac_ctx(dst); + struct hmac_ctx *sctx = crypto_shash_ctx(src); + struct hmac_ctx *dctx = crypto_shash_ctx(dst); struct crypto_shash *hash; hash = crypto_clone_shash(sctx->hash); @@ -176,9 +169,9 @@ static int hmac_clone_tfm(struct crypto_shash *dst, struct crypto_shash *src) static void hmac_exit_tfm(struct crypto_shash *parent) { - struct hmac_ctx *ctx = hmac_ctx(parent); + struct hmac_ctx *tctx = crypto_shash_ctx(parent); - crypto_free_shash(ctx->hash); + crypto_free_shash(tctx->hash); } static int hmac_create(struct crypto_template *tmpl, struct rtattr **tb) @@ -225,15 +218,10 @@ static int hmac_create(struct crypto_template *tmpl, struct rtattr **tb) inst->alg.base.cra_priority = alg->cra_priority; inst->alg.base.cra_blocksize = alg->cra_blocksize; - inst->alg.base.cra_alignmask = alg->cra_alignmask; + inst->alg.base.cra_ctxsize = sizeof(struct hmac_ctx) + (ss * 2); - ss = ALIGN(ss, alg->cra_alignmask + 1); inst->alg.digestsize = ds; inst->alg.statesize = ss; - - inst->alg.base.cra_ctxsize = sizeof(struct hmac_ctx) + - ALIGN(ss * 2, crypto_tfm_ctx_alignment()); - inst->alg.init = hmac_init; inst->alg.update = hmac_update; inst->alg.final = hmac_final; |