[FFmpeg-cvslog] avutil: Add detailed Doxygen description to a few hashes

[Timothy Gu]

ffmpeg | branch: master | Timothy Gu <timothygu99 at gmail.com> | Mon Aug  1 19:53:50 2016 -0700| [0a7a4e33f3030253aa86eaecd4b05c047e0918f9] | committer: Timothy Gu

avutil: Add detailed Doxygen description to a few hashes

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0a7a4e33f3030253aa86eaecd4b05c047e0918f9
---

 libavutil/crc.h    | 4 ++++
 libavutil/sha.h    | 8 ++++++++
 libavutil/sha512.h | 9 +++++++++
 3 files changed, 21 insertions(+)

diff --git a/libavutil/crc.h b/libavutil/crc.h
index f0556a9..2a1b0d7 100644
--- a/libavutil/crc.h
+++ b/libavutil/crc.h
@@ -37,6 +37,10 @@
  * @ingroup lavu_hash
  * CRC (Cyclic Redundancy Check) hash function implementation.
  *
+ * This module supports numerous CRC polynomials, in addition to the most
+ * widely used CRC-32-IEEE. See @ref AVCRCId for a list of available
+ * polynomials.
+ *
  * @{
  */
 
diff --git a/libavutil/sha.h b/libavutil/sha.h
index 89052eb..c7558a8 100644
--- a/libavutil/sha.h
+++ b/libavutil/sha.h
@@ -37,6 +37,14 @@
  * @ingroup lavu_hash
  * SHA-1 and SHA-256 (Secure Hash Algorithm) hash function implementations.
  *
+ * This module supports the following SHA hash functions:
+ *
+ * - SHA-1: 160 bits
+ * - SHA-224: 224 bits, as a variant of SHA-2
+ * - SHA-256: 256 bits, as a variant of SHA-2
+ *
+ * @see For SHA-384, SHA-512, and variants thereof, see @ref lavu_sha512.
+ *
  * @{
  */
 
diff --git a/libavutil/sha512.h b/libavutil/sha512.h
index 2391e37..5bac184 100644
--- a/libavutil/sha512.h
+++ b/libavutil/sha512.h
@@ -38,6 +38,15 @@
  * @ingroup lavu_hash
  * SHA-512 (Secure Hash Algorithm) hash function implementations.
  *
+ * This module supports the following SHA-2 hash functions:
+ *
+ * - SHA-512/224: 224 bits
+ * - SHA-512/256: 256 bits
+ * - SHA-384: 384 bits
+ * - SHA-512: 512 bits
+ *
+ * @see For SHA-1, SHA-256, and variants thereof, see @ref lavu_sha.
+ *
  * @{
  */