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crypto: DRBG - initialize SGL only once

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An SGL to be initialized only once even when its buffers are written
to several times.

Signed-off-by: Stephan Mueller <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
This commit is contained in:
Stephan Mueller 2017-03-22 15:26:36 +01:00 • committed by Herbert Xu
commit 44068d5999
1 changed files with 2 additions and 3 deletions
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5
crypto/drbg.c
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@ -1749,17 +1749,16 @@ static int drbg_kcapi_sym_ctr(struct drbg_state *drbg,
u8 *inbuf, u32 inlen,
u8 *outbuf, u32 outlen)
{
struct scatterlist sg_in;
struct scatterlist sg_in, sg_out;
int ret;
sg_init_one(&sg_in, inbuf, inlen);
sg_init_one(&sg_out, drbg->outscratchpad, DRBG_OUTSCRATCHLEN);
while (outlen) {
u32 cryptlen = min3(inlen, outlen, (u32)DRBG_OUTSCRATCHLEN);
struct scatterlist sg_out;
/* Output buffer may not be valid for SGL, use scratchpad */
sg_init_one(&sg_out, drbg->outscratchpad, cryptlen);
skcipher_request_set_crypt(drbg->ctr_req, &sg_in, &sg_out,
cryptlen, drbg->V);
ret = crypto_skcipher_encrypt(drbg->ctr_req);