The standards documents are silent on how to handle multi-part
output, so this is an RFC for something in the spirit of the
source specifications, but not actually required by them.
Signed-off-by: George Spelvin <linux@xxxxxxxxxxx>
---
crypto/ansi_cprng.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/crypto/ansi_cprng.c b/crypto/ansi_cprng.c
index d39ce301..b88d3446 100644
--- a/crypto/ansi_cprng.c
+++ b/crypto/ansi_cprng.c
@@ -198,12 +198,14 @@ static int get_prng_bytes(u8 *buf, unsigned int nbytes,
read_pos = ctx->rand_read_pos;
if (byte_count > DEFAULT_BLK_SZ - read_pos) {
- /* Leading partial block */
- unsigned int avail = DEFAULT_BLK_SZ - read_pos;
+ if (ctx->flags & PRNG_DETERMINISTIC) {
+ /* Return leftover data from previous call */
+ unsigned int avail = DEFAULT_BLK_SZ - read_pos;
- memcpy(ptr, ctx->rand_data.b + read_pos, avail);
- ptr += avail;
- byte_count -= avail;
+ memcpy(ptr, ctx->rand_data.b + read_pos, avail);
+ ptr += avail;
+ byte_count -= avail;
+ }
read_pos = 0;
/* Intermediate full blocks */
--
2.1.3
--
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