[libav-devel] [PATCH 1/2] hmac: add support for SHA-2

[James Almer]

Signed-off-by: James Almer <jamr...@gmail.com>
---
 libavutil/hmac.c | 31 ++++++++++++++++++++++++++-----
 libavutil/hmac.h |  2 ++
 2 files changed, 28 insertions(+), 5 deletions(-)

diff --git a/libavutil/hmac.c b/libavutil/hmac.c
index f87728e..318174e 100644
--- a/libavutil/hmac.c
+++ b/libavutil/hmac.c
@@ -26,7 +26,7 @@
 #include "sha.h"
 #include "mem.h"
 
-#define MAX_HASHLEN 20
+#define MAX_HASHLEN 32
 #define MAX_BLOCKLEN 64
 
 struct AVHMAC {
@@ -39,11 +39,16 @@ struct AVHMAC {
     int keylen;
 };
 
-static av_cold void sha1_init(void *ctx)
-{
-    av_sha_init(ctx, 160);
+#define DEFINE_SHA(bits)                           \
+static av_cold void sha ## bits ##_init(void *ctx) \
+{                                                  \
+    av_sha_init(ctx, bits);                        \
 }
 
+DEFINE_SHA(160)
+DEFINE_SHA(224)
+DEFINE_SHA(256)
+
 AVHMAC *av_hmac_alloc(enum AVHMACType type)
 {
     AVHMAC *c = av_mallocz(sizeof(*c));
@@ -61,7 +66,23 @@ AVHMAC *av_hmac_alloc(enum AVHMACType type)
     case AV_HMAC_SHA1:
         c->blocklen = 64;
         c->hashlen  = 20;
-        c->init     = sha1_init;
+        c->init     = sha160_init;
+        c->update   = av_sha_update;
+        c->final    = av_sha_final;
+        c->hash     = av_sha_alloc();
+        break;
+    case AV_HMAC_SHA224:
+        c->blocklen = 64;
+        c->hashlen  = 28;
+        c->init     = sha224_init;
+        c->update   = av_sha_update;
+        c->final    = av_sha_final;
+        c->hash     = av_sha_alloc();
+        break;
+    case AV_HMAC_SHA256:
+        c->blocklen = 64;
+        c->hashlen  = 32;
+        c->init     = sha256_init;
         c->update   = av_sha_update;
         c->final    = av_sha_final;
         c->hash     = av_sha_alloc();
diff --git a/libavutil/hmac.h b/libavutil/hmac.h
index 28c2062..1ed5626 100644
--- a/libavutil/hmac.h
+++ b/libavutil/hmac.h
@@ -32,6 +32,8 @@
 enum AVHMACType {
     AV_HMAC_MD5,
     AV_HMAC_SHA1,
+    AV_HMAC_SHA224,
+    AV_HMAC_SHA256,
 };
 
 typedef struct AVHMAC AVHMAC;
-- 
2.4.6

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