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| author | Stephan Mueller <smueller@chronox.de> | 2015-03-06 08:26:31 +0100 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2015-03-09 21:06:18 +1100 |
| commit | cde001e4c3c3625c60b68a83eb1f1c2572dee07a (patch) | |
| tree | 6b0a069f9fdfa36c3741164564ea163f9cb69820 /crypto/drbg.c | |
| parent | 4842234f83bfce83c93f84f5972a956ef2c87805 (diff) | |
| download | lwn-cde001e4c3c3625c60b68a83eb1f1c2572dee07a.tar.gz lwn-cde001e4c3c3625c60b68a83eb1f1c2572dee07a.zip | |
crypto: rng - RNGs must return 0 in success case
Change the RNGs to always return 0 in success case.
This patch ensures that seqiv.c works with RNGs other than krng. seqiv
expects that any return code other than 0 is an error. Without the
patch, rfc4106(gcm(aes)) will not work when using a DRBG or an ANSI
X9.31 RNG.
Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/drbg.c')
| -rw-r--r-- | crypto/drbg.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/crypto/drbg.c b/crypto/drbg.c index 56c1d7ec3d9e..b69409cb7e6a 100644 --- a/crypto/drbg.c +++ b/crypto/drbg.c @@ -1280,7 +1280,7 @@ static void drbg_restore_shadow(struct drbg_state *drbg, * as defined in SP800-90A. The additional input is mixed into * the state in addition to the pulled entropy. * - * return: generated number of bytes + * return: 0 when all bytes are generated; < 0 in case of an error */ static int drbg_generate(struct drbg_state *drbg, unsigned char *buf, unsigned int buflen, @@ -1419,6 +1419,11 @@ static int drbg_generate(struct drbg_state *drbg, } #endif + /* + * All operations were successful, return 0 as mandated by + * the kernel crypto API interface. + */ + len = 0; err: shadow->d_ops->crypto_fini(shadow); drbg_restore_shadow(drbg, &shadow); |