Import patches for old macOS from MacPorts

Author: nobu

ext/digest/md5/md5cc.h

@@ -25,3 +25,11 @@ static DEFINE_FINISH_FUNC_FROM_FINAL(MD5)
 #undef MD5_Finish
 #define MD5_Update rb_digest_MD5_update
 #define MD5_Finish rb_digest_MD5_finish
+
+/*
+ * Pre-10.6 defines are with args, which don't match the argless use in
+ * the function pointer inits.  Thus, we redefine MD5_Init as well.
+ * This is a NOP on 10.6+.
+ */
+#undef MD5_Init
+#define MD5_Init CC_MD5_Init

ext/digest/sha1/sha1cc.h

@@ -12,3 +12,11 @@ static DEFINE_FINISH_FUNC_FROM_FINAL(SHA1)
 #undef SHA1_Finish
 #define SHA1_Update rb_digest_SHA1_update
 #define SHA1_Finish rb_digest_SHA1_finish
+
+/*
+ * Pre-10.6 defines are with args, which don't match the argless use in
+ * the function pointer inits.  Thus, we redefine SHA1_Init as well.
+ * This is a NOP on 10.6+.
+ */
+#undef SHA1_Init
+#define SHA1_Init CC_SHA1_Init

ext/digest/sha2/sha2cc.h

@@ -1,6 +1,33 @@
 #define COMMON_DIGEST_FOR_OPENSSL 1
 #include <CommonCrypto/CommonDigest.h>
 
+/*
+ * Prior to 10.5, OpenSSL-compatible definitions are missing for
+ * SHA2 macros, though the CC_ versions are present.
+ * Add the missing definitions we actually use here if needed.
+ * Note that the definitions are the argless 10.6+-style.
+ * The weird CTX mismatch is copied from the 10.6 header.
+ */
+#ifndef SHA256_DIGEST_LENGTH
+#define SHA256_DIGEST_LENGTH	CC_SHA256_DIGEST_LENGTH
+#define SHA256_CTX		CC_SHA256_CTX
+#define SHA256_Update		CC_SHA256_Update
+#define SHA256_Final		CC_SHA256_Final
+#endif /* !defined SHA256_DIGEST_LENGTH */
+
+#ifndef SHA384_DIGEST_LENGTH
+#define SHA384_DIGEST_LENGTH	CC_SHA384_DIGEST_LENGTH
+#define SHA512_CTX		CC_SHA512_CTX
+#define SHA384_Update		CC_SHA384_Update
+#define SHA384_Final		CC_SHA384_Final
+#endif /* !defined SHA384_DIGEST_LENGTH */
+
+#ifndef SHA512_DIGEST_LENGTH
+#define SHA512_DIGEST_LENGTH	CC_SHA512_DIGEST_LENGTH
+#define SHA512_Update		CC_SHA512_Update
+#define SHA512_Final		CC_SHA512_Final
+#endif /* !defined SHA512_DIGEST_LENGTH */
+
 #define SHA256_BLOCK_LENGTH	CC_SHA256_BLOCK_BYTES
 #define SHA384_BLOCK_LENGTH	CC_SHA384_BLOCK_BYTES
 #define SHA512_BLOCK_LENGTH	CC_SHA512_BLOCK_BYTES
@@ -29,3 +56,15 @@ static DEFINE_FINISH_FUNC_FROM_FINAL(SHA512)
 #undef SHA512_Finish
 #define SHA512_Update rb_digest_SHA512_update
 #define SHA512_Finish rb_digest_SHA512_finish
+
+/*
+ * Pre-10.6 defines are with args, which don't match the argless use in
+ * the function pointer inits.  Thus, we redefine SHA*_Init as well.
+ * This is a NOP on 10.6+.
+ */
+#undef SHA256_Init
+#define SHA256_Init CC_SHA256_Init
+#undef SHA384_Init
+#define SHA384_Init CC_SHA384_Init
+#undef SHA512_Init
+#define SHA512_Init CC_SHA512_Init