[PATCH] imap-send: eliminate HMAC warnings on OS X 10.8

[David Aguilar <davvid@gmail.com>]

Mac OS X Mountain Lion warns that HMAC_Init() and friends are
deprecated.  Use CommonCrypto's HMAC to eliminate the warnings.

Signed-off-by: David Aguilar <davvid@gmail.com>
---
This builds upon the patch I sent earlier, so technically it's 2/2

While researching these errors I found this:

http://opensource.apple.com/source/Git/Git-37/src/git/imap-send.c

The approach in this patch is similar in spirit, but simpler since
it avoids pushing #ifdefs into the function bodies.

 Makefile    |  5 +++++
 imap-send.c | 10 ++++++++++
 2 files changed, 15 insertions(+)

diff --git a/Makefile b/Makefile
index d8a45b4..7e12999 100644
--- a/Makefile
+++ b/Makefile
@@ -1055,6 +1055,7 @@ ifeq ($(uname_S),Darwin)
 		endif
 	endif
 	COMMON_DIGEST_SHA1 = YesPlease
+	COMMON_DIGEST_HMAC = YesPlease
 	PTHREAD_LIBS =
 endif
 
@@ -1399,6 +1400,10 @@ else
 endif
 endif
 endif
+
+ifdef COMMON_DIGEST_HMAC
+	BASIC_CFLAGS += -DCOMMON_DIGEST_FOR_HMAC=1
+endif
 ifdef NO_PERL_MAKEMAKER
 	export NO_PERL_MAKEMAKER
 endif
diff --git a/imap-send.c b/imap-send.c
index d9bcfb4..1b2e69c 100644
--- a/imap-send.c
+++ b/imap-send.c
@@ -29,8 +29,18 @@
 #ifdef NO_OPENSSL
 typedef void *SSL;
 #else
+#ifdef COMMON_DIGEST_FOR_HMAC
+#include <CommonCrypto/CommonHMAC.h>
+#define HMAC_CTX CCHmacContext
+#define HMAC_Init(hmac, key, len, algo) CCHmacInit(hmac, algo, key, len)
+#define HMAC_Update CCHmacUpdate
+#define HMAC_Final(hmac, hash, ptr) CCHmacFinal(hmac, hash)
+#define HMAC_CTX_cleanup
+#define EVP_md5() kCCHmacAlgMD5
+#else
 #include <openssl/evp.h>
 #include <openssl/hmac.h>
+#endif
 #include <openssl/x509v3.h>
 #endif
 
-- 
1.8.3.rc1.46.g9f9589e