int crypto_akcipher_sync_prep(struct crypto_akcipher_sync_data *data)
{
unsigned int reqsize = crypto_akcipher_reqsize(data->tfm);
- unsigned int mlen = max(data->slen, data->dlen);
struct akcipher_request *req;
struct scatterlist *sg;
+ unsigned int mlen;
unsigned int len;
u8 *buf;
+ if (data->dst)
+ mlen = max(data->slen, data->dlen);
+ else
+ mlen = data->slen + data->dlen;
+
len = sizeof(*req) + reqsize + mlen;
if (len < mlen)
return -EOVERFLOW;
data->buf = buf;
memcpy(buf, data->src, data->slen);
- sg = data->sg;
+ sg = &data->sg;
sg_init_one(sg, buf, mlen);
- akcipher_request_set_crypt(req, sg, sg, data->slen, data->dlen);
+ akcipher_request_set_crypt(req, sg, data->dst ? sg : NULL,
+ data->slen, data->dlen);
crypto_init_wait(&data->cwait);
akcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP,
if (err)
return err;
- sg_init_table(data.sg, 2);
- sg_set_buf(&data.sg[0], src, slen);
- sg_set_buf(&data.sg[1], digest, dlen);
+ memcpy(data.buf + slen, digest, dlen);
return crypto_akcipher_sync_post(&data,
crypto_akcipher_verify(data.req));