Add macros to construct openssl version numbers

It's a pain to convert 0x0090813f to and from 0.9.8s-release on the
fly, so these macros should help.

1 files changed, 32 insertions, 0 deletions

diff --git a/src/common/crypto.h b/src/common/crypto.h
index 771c49c2d..478365444 100644
--- a/src/common/crypto.h
+++ b/src/common/crypto.h
@@ -16,6 +16,38 @@
 #include <stdio.h>
 #include "torint.h"
 
+/*
+  Macro to create an arbitrary OpenSSL version number as used by
+  OPENSSL_VERSION_NUMBER or SSLeay(), since the actual numbers are a bit hard
+  to read.
+
+  Don't use this directly, instead use one of the other OPENSSL_V macros
+  below.
+
+  The format is: 4 bits major, 8 bits minor, 8 bits fix, 8 bits patch, 4 bit
+  status.
+ */
+#define OPENSSL_VER(a,b,c,d,e)                                \
+  (((a)<<28) |                                                \
+   ((b)<<20) |                                                \
+   ((c)<<12) |                                                \
+   ((d)<< 4) |                                                \
+    (e))
+/** An openssl release number.  For example, OPENSSL_V(0,9,8,'j') is the
+ * version for the released version of 0.9.8j */
+#define OPENSSL_V(a,b,c,d) \
+  OPENSSL_VER((a),(b),(c),(d)-'a'+1,0xf)
+/** An openssl release number for the first release in the series.  For
+ * example, OPENSSL_V_NOPATCH(1,0,0) is the first released version of OpenSSL
+ * 1.0.0. */
+#define OPENSSL_V_NOPATCH(a,b,c) \
+  OPENSSL_VER((a),(b),(c),0,0xf)
+/** The first version that would occur for any alpha or beta in an openssl
+ * series. For example, OPENSSL_V_SERIES(0,9,8) is greater than any released
+ * 0.9.7, and less than any released 0.9.8. */
+#define OPENSSL_V_SERIES(a,b,c) \
+  OPENSSL_VER((a),(b),(c),0,0)
+
 /** Length of the output of our message digest. */
 #define DIGEST_LEN 20
 /** Length of the output of our second (improved) message digests.  (For now