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crypto: rng - RNGs must return 0 in success case

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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>
This commit is contained in:
Stephan Mueller
2015-03-06 08:26:31 +01:00
committed by Herbert Xu
parent 4842234f83
commit cde001e4c3
3 changed files with 12 additions and 4 deletions
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6
crypto/ansi_cprng.c
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@@ -210,7 +210,11 @@ static int get_prng_bytes(char *buf, size_t nbytes, struct prng_context *ctx,
byte_count = DEFAULT_BLK_SZ;
}
err = byte_count;
/*
* Return 0 in case of success as mandated by the kernel
* crypto API interface definition.
*/
err = 0;
dbgprint(KERN_CRIT "getting %d random bytes for context %p\n",
byte_count, ctx);