Commit 8ff4c191 authored Nov 18, 2016 by Stephan Mueller Committed by Herbert Xu Nov 21, 2016

crypto: drbg - advance output buffer pointer



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>

parent 18f47f5e

crypto/drbg.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -1766,6 +1766,7 @@ static int drbg_kcapi_sym_ctr(struct drbg_state *drbg,
		init_completion(&drbg->ctr_completion);

		outlen -= cryptlen;
		outbuf += cryptlen;
		}

		return 0;

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