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

Reviewed-by: Jonathan Nieder <jrnie...@gmail.com>
Signed-off-by: David Aguilar <dav...@gmail.com>
---
Rebased to 2/3.

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

diff --git a/Makefile b/Makefile
index f698c1a..25282b4 100644
--- a/Makefile
+++ b/Makefile
@@ -1054,6 +1054,7 @@ ifeq ($(uname_S),Darwin)
                        BASIC_LDFLAGS += -L/opt/local/lib
                endif
        endif
+       COMMON_DIGEST_HMAC = YesPlease
        NO_REGEX = YesPlease
        PTHREAD_LIBS =
 endif
@@ -1393,6 +1394,10 @@ else
        EXTLIBS += $(LIB_4_CRYPTO)
 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.rc1.47.g41936fa

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