From: Stephan Mueller <smueller@chronox•de>
To: herbert@gondor•apana.org.au
Cc: joe@perches•com, dan.carpenter@oracle•com,
Stephen Rothwell <sfr@canb•auug.org.au>,
fengguang.wu@intel•com, Randy Dunlap <rdunlap@infradead•org>,
linux-crypto@vger•kernel.org, linux-next@vger•kernel.org,
linux-kernel@vger•kernel.org, Rafael Aquini <aquini@redhat•com>,
aris@redhat•com
Subject: [PATCH 6/6] DRBG: HMAC-SHA1 DRBG has crypto strength of 128 bits
Date: Sun, 06 Jul 2014 02:26:37 +0200 [thread overview]
Message-ID: <2038501.NQxD5ZZc1H@myon.chronox.de> (raw)
In-Reply-To: <2266932.bfVPMOTOeI@myon.chronox.de>
The patch corrects the security strength of the HMAC-SHA1 DRBG to 128
bits. This strength defines the size of the seed required for the DRBG.
Thus, the patch lowers the seeding requirement from 256 bits to 128 bits
for HMAC-SHA1.
Signed-off-by: Stephan Mueller <smueller@chronox•de>
---
crypto/drbg.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/crypto/drbg.c b/crypto/drbg.c
index a76b3cb..84478cb 100644
--- a/crypto/drbg.c
+++ b/crypto/drbg.c
@@ -184,7 +184,7 @@ static const struct drbg_core drbg_cores[] = {
#endif /* CONFIG_CRYPTO_DRBG_HASH */
#ifdef CONFIG_CRYPTO_DRBG_HMAC
{
- .flags = DRBG_HMAC | DRBG_STRENGTH256,
+ .flags = DRBG_HMAC | DRBG_STRENGTH128,
.statelen = 20, /* block length of cipher */
.max_addtllen = 35,
.max_bits = 19,
--
1.9.3
next prev parent reply other threads:[~2014-07-06 0:35 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-06 0:22 [PATCH 0/6] DRBG: Rebasing unapplied patches Stephan Mueller
2014-07-06 0:23 ` [PATCH 1/6] DRBG: cleanup of preprocessor macros Stephan Mueller
2014-07-06 0:24 ` [PATCH 2/6] DRBG: Fix format string for debugging statements Stephan Mueller
2014-07-06 0:24 ` [PATCH 3/6] DRBG: Call CTR DRBG DF function only once Stephan Mueller
2014-07-06 0:25 ` [PATCH 4/6] DRBG: Select correct DRBG core for stdrng Stephan Mueller
2014-07-06 0:25 ` [PATCH 5/6] DRBG: Mix a time stamp into DRBG state Stephan Mueller
2014-07-06 0:26 ` Stephan Mueller [this message]
2014-07-08 13:21 ` [PATCH 0/6] DRBG: Rebasing unapplied patches Herbert Xu
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