Commit 37821da0 authored by Stephan Mueller's avatar Stephan Mueller Committed by Herbert Xu
Browse files

crypto: drbg - remove superflowous memsets 



The DRBG code contains memset(0) calls to initialize a varaible
that are not necessary as the variable is always overwritten by
the processing.

This patch increases the CTR and Hash DRBGs by about 5%.

Signed-off-by: default avatarStephan Mueller <smueller@chronox.de>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 04bcbfcf

crypto/drbg.c

+0 −18
Original line number Diff line number Diff line
@@ -308,9 +308,6 @@ static int drbg_ctr_bcc(struct drbg_state *drbg, 


	drbg_string_fill(&data, out, drbg_blocklen(drbg));



	/* 10.4.3 step 1 */

	memset(out, 0, drbg_blocklen(drbg));



	/* 10.4.3 step 2 / 4 */

	list_for_each_entry(curr, in, list) {

		const unsigned char *pos = curr->buf;
@@ -406,7 +403,6 @@ static int drbg_ctr_df(struct drbg_state *drbg, 


	memset(pad, 0, drbg_blocklen(drbg));

	memset(iv, 0, drbg_blocklen(drbg));

	memset(temp, 0, drbg_statelen(drbg));



	/* 10.4.2 step 1 is implicit as we work byte-wise */
@@ -523,7 +519,6 @@ static int drbg_ctr_update(struct drbg_state *drbg, struct list_head *seed, 
	unsigned int len = 0;

	struct drbg_string cipherin;



	memset(temp, 0, drbg_statelen(drbg) + drbg_blocklen(drbg));

	if (3 > reseed)

		memset(df_data, 0, drbg_statelen(drbg));
@@ -585,8 +580,6 @@ static int drbg_ctr_generate(struct drbg_state *drbg, 
	int ret = 0;

	struct drbg_string data;



	memset(drbg->scratchpad, 0, drbg_blocklen(drbg));



	/* 10.2.1.5.2 step 2 */

	if (addtl && !list_empty(addtl)) {

		ret = drbg_ctr_update(drbg, addtl, 2);
@@ -761,7 +754,6 @@ static struct drbg_state_ops drbg_hmac_ops = { 
	.generate	= drbg_hmac_generate,

	.crypto_init	= drbg_init_hash_kernel,

	.crypto_fini	= drbg_fini_hash_kernel,



};

#endif /* CONFIG_CRYPTO_DRBG_HMAC */
@@ -838,8 +830,6 @@ static int drbg_hash_df(struct drbg_state *drbg, 
	unsigned char *tmp = drbg->scratchpad + drbg_statelen(drbg);

	struct drbg_string data;



	memset(tmp, 0, drbg_blocklen(drbg));



	/* 10.4.1 step 3 */

	input[0] = 1;

	drbg_cpu_to_be32((outlen * 8), &input[1]);
@@ -879,7 +869,6 @@ static int drbg_hash_update(struct drbg_state *drbg, struct list_head *seed, 
	unsigned char *V = drbg->scratchpad;

	unsigned char prefix = DRBG_PREFIX1;



	memset(drbg->scratchpad, 0, drbg_statelen(drbg));

	if (!seed)

		return -EINVAL;
@@ -921,9 +910,6 @@ static int drbg_hash_process_addtl(struct drbg_state *drbg, 
	LIST_HEAD(datalist);

	unsigned char prefix = DRBG_PREFIX2;



	/* this is value w as per documentation */

	memset(drbg->scratchpad, 0, drbg_blocklen(drbg));



	/* 10.1.1.4 step 2 */

	if (!addtl || list_empty(addtl))

		return 0;
@@ -959,9 +945,6 @@ static int drbg_hash_hashgen(struct drbg_state *drbg, 
	struct drbg_string data;

	LIST_HEAD(datalist);



	memset(src, 0, drbg_statelen(drbg));

	memset(dst, 0, drbg_blocklen(drbg));



	/* 10.1.1.4 step hashgen 2 */

	memcpy(src, drbg->V, drbg_statelen(drbg));
@@ -1018,7 +1001,6 @@ static int drbg_hash_generate(struct drbg_state *drbg, 
	len = drbg_hash_hashgen(drbg, buf, buflen);



	/* this is the value H as documented in 10.1.1.4 */

	memset(drbg->scratchpad, 0, drbg_blocklen(drbg));

	/* 10.1.1.4 step 4 */

	drbg_string_fill(&data1, &prefix, 1);

	list_add_tail(&data1.list, &datalist);

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