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crypto: drbg - advance output buffer pointer

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The CTR DRBG segments the number of random bytes to be generated into
128 byte blocks. The current code misses the advancement of the output
buffer pointer when the requestor asks for more than 128 bytes of data.
In this case, the next 128 byte block of random numbers is copied to
the beginning of the output buffer again. This implies that only the
first 128 bytes of the output buffer would ever be filled.

The patch adds the advancement of the buffer pointer to fill the entire
buffer.

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 2016-11-18 12:27:56 +01:00 committed by Herbert Xu
parent 18f47f5e47
commit 8ff4c191d1
1 changed files with 1 additions and 0 deletions
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crypto/drbg.c
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@ -1766,6 +1766,7 @@ static int drbg_kcapi_sym_ctr(struct drbg_state *drbg,
init_completion(&drbg->ctr_completion); init_completion(&drbg->ctr_completion);
outlen -= cryptlen; outlen -= cryptlen;
outbuf += cryptlen;
} }
return 0; return 0;