On Tue, 4 Jul 2023, James Almer wrote:
Uses the existing code for av_get_random_seed() to return a buffer with
cryptographically secure random data, or an error if none could be generated.
Signed-off-by: James Almer <jamr...@gmail.com>
---
libavutil/random_seed.c | 54 ++++++++++++++++++++++++++++-------------
libavutil/random_seed.h | 12 +++++++++
2 files changed, 49 insertions(+), 17 deletions(-)
diff --git a/libavutil/random_seed.c b/libavutil/random_seed.c
index 66dd504ef0..0ed8f89cc6 100644
--- a/libavutil/random_seed.c
+++ b/libavutil/random_seed.c
@@ -46,20 +46,22 @@
#define TEST 0
#endif
-static int read_random(uint32_t *dst, const char *file)
-{
#if HAVE_UNISTD_H
+static int read_random(uint8_t *dst, size_t len, const char *file)
Maybe it is cleaner if you also use ffmpeg error codes for this function,
and no special -1, 1 or 0 return value.
+{
int fd = avpriv_open(file, O_RDONLY);
- int err = -1;
+ ssize_t err = -1;
+ if (len > SSIZE_MAX)
+ return -1;
if (fd == -1)
return -1;
- err = read(fd, dst, sizeof(*dst));
+ err = read(fd, dst, len);
As Anton pointed out, this can read less than requested. I suggest using
avpriv_fopen_utf8() and fread(), that should loop reading internally
until the whole length is filled.
Regards,
Marton
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