[FFmpeg-devel] [PATCH 2/2] avutil/random_seed: ass support for gcrypt and OpenSSL as source of randomness

[James Almer <jamrial@gmail.com>]

Signed-off-by: James Almer <jamrial@gmail.com>
---
I put these after /dev/random/ to not change the current behavior of
av_get_random_seed(), but if either of these are prefered i can move them up.

 configure               |  2 +-
 libavutil/random_seed.c | 13 +++++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index 107d533b3e..d6e78297fe 100755
--- a/configure
+++ b/configure
@@ -3892,7 +3892,7 @@ avfilter_deps="avutil"
 avfilter_suggest="libm stdatomic"
 avformat_deps="avcodec avutil"
 avformat_suggest="libm network zlib stdatomic"
-avutil_suggest="clock_gettime ffnvcodec libm libdrm libmfx opencl user32 vaapi vulkan videotoolbox corefoundation corevideo coremedia bcrypt stdatomic"
+avutil_suggest="clock_gettime ffnvcodec gcrypt libm libdrm libmfx opencl openssl user32 vaapi vulkan videotoolbox corefoundation corevideo coremedia bcrypt stdatomic"
 postproc_deps="avutil gpl"
 postproc_suggest="libm stdatomic"
 swresample_deps="avutil"
diff --git a/libavutil/random_seed.c b/libavutil/random_seed.c
index 39fb27c5ad..e8967c0cfe 100644
--- a/libavutil/random_seed.c
+++ b/libavutil/random_seed.c
@@ -30,6 +30,11 @@
 #include <windows.h>
 #include <bcrypt.h>
 #endif
+#if CONFIG_GCRYPT
+#include <gcrypt.h>
+#elif CONFIG_OPENSSL
+#include <openssl/rand.h>
+#endif
 #include <fcntl.h>
 #include <math.h>
 #include <time.h>
@@ -144,6 +149,14 @@ int av_random(uint8_t* buf, size_t len)
         return 0;
 #endif
 
+#if CONFIG_GCRYPT
+    gcry_randomize(buf, len, GCRY_VERY_STRONG_RANDOM);
+    return 0;
+#elif CONFIG_OPENSSL
+    if (RAND_bytes(buf, len))
+        return 0;
+#endif
+
     return AVERROR_INVALIDDATA;
 }
 
-- 
2.41.0

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