[PATCH v5 2/2] imap-send: eliminate HMAC deprecation warnings on Mac OS X

[David Aguilar <davvid@gmail.com>]

Mac OS X 10.8 Mountain Lion warns that HMAC_Init() and friends
are deprecated.  Detect the COMMON_CRYPTO_FOR_OPENSSL definition
and use CommonCrypto's HMAC functions to eliminate the warnings.

Signed-off-by: David Aguilar <davvid@gmail.com>
---
Changes since last time:

This version re-uses the existing COMMON_CRYPTO_FOR_OPENSSL define
instead of tweaking the Makefile to add a new one, so it's simpler.

My previous patch had Jonathan's reviewed-by tag, but he hasn't
reviewed this exact patch, so I removed it.  The C macros are unchanged.

 imap-send.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/imap-send.c b/imap-send.c
index d9bcfb4..96012b1 100644
--- a/imap-send.c
+++ b/imap-send.c
@@ -29,8 +29,18 @@
 #ifdef NO_OPENSSL
 typedef void *SSL;
 #else
+#ifdef COMMON_DIGEST_FOR_OPENSSL
+#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.rc2.2.gbc955d1