Re-defines SHA2 symbols so that they would not conflict with certain

versions of OpenSSL.  If your OpenSSL does not contain SHA2, then there
should be no conflict.  But ofcourse, if someone upgrades OpenSSL,
server starts crashing.

Backpatched to 8.1.X.

Marko Kreen

contrib/pgcrypto/sha2.c

@@ -33,7 +33,7 @@
  *
  * $From: sha2.c,v 1.1 2001/11/08 00:01:51 adg Exp adg $
  *
- * $PostgreSQL: pgsql/contrib/pgcrypto/sha2.c,v 1.5 2005/10/15 02:49:06 momjian Exp $
+ * $PostgreSQL: pgsql/contrib/pgcrypto/sha2.c,v 1.6 2006/05/30 12:56:45 momjian Exp $
  */
 
 #include "postgres.h"
@@ -163,9 +163,9 @@
  * library -- they are intended for private internal visibility/use
  * only.
  */
-void		SHA512_Last(SHA512_CTX *);
-void		SHA256_Transform(SHA256_CTX *, const uint8 *);
-void		SHA512_Transform(SHA512_CTX *, const uint8 *);
+static void SHA512_Last(SHA512_CTX *);
+static void SHA256_Transform(SHA256_CTX *, const uint8 *);
+static void SHA512_Transform(SHA512_CTX *, const uint8 *);
 
 
 /*** SHA-XYZ INITIAL HASH VALUES AND CONSTANTS ************************/
@@ -307,7 +307,7 @@ SHA256_Init(SHA256_CTX * context)
 	j++;									\
 } while(0)
 
-void
+static void
 SHA256_Transform(SHA256_CTX * context, const uint8 *data)
 {
 	uint32		a,
@@ -378,7 +378,7 @@ SHA256_Transform(SHA256_CTX * context, const uint8 *data)
 }
 #else							/* SHA2_UNROLL_TRANSFORM */
 
-void
+static void
 SHA256_Transform(SHA256_CTX * context, const uint8 *data)
 {
 	uint32		a,
@@ -631,7 +631,7 @@ SHA512_Init(SHA512_CTX * context)
 	j++;									\
 } while(0)
 
-void
+static void
 SHA512_Transform(SHA512_CTX * context, const uint8 *data)
 {
 	uint64		a,
@@ -699,7 +699,7 @@ SHA512_Transform(SHA512_CTX * context, const uint8 *data)
 }
 #else							/* SHA2_UNROLL_TRANSFORM */
 
-void
+static void
 SHA512_Transform(SHA512_CTX * context, const uint8 *data)
 {
 	uint64		a,
@@ -842,7 +842,7 @@ SHA512_Update(SHA512_CTX * context, const uint8 *data, size_t len)
 	usedspace = freespace = 0;
 }
 
-void
+static void
 SHA512_Last(SHA512_CTX * context)
 {
 	unsigned int usedspace;

contrib/pgcrypto/sha2.h

-/*	$PostgreSQL: pgsql/contrib/pgcrypto/sha2.h,v 1.2 2005/10/15 02:49:06 momjian Exp $ */
+/*	$PostgreSQL: pgsql/contrib/pgcrypto/sha2.h,v 1.3 2006/05/30 12:56:45 momjian Exp $ */
 /*	$OpenBSD: sha2.h,v 1.2 2004/04/28 23:11:57 millert Exp $	*/
 
 /*
@@ -38,6 +38,16 @@
 #ifndef _SHA2_H
 #define _SHA2_H
 
+/* avoid conflict with OpenSSL */
+#define SHA256_Init pg_SHA256_Init
+#define SHA256_Update pg_SHA256_Update
+#define SHA256_Final pg_SHA256_Final
+#define SHA384_Init pg_SHA384_Init
+#define SHA384_Update pg_SHA384_Update
+#define SHA384_Final pg_SHA384_Final
+#define SHA512_Init pg_SHA512_Init
+#define SHA512_Update pg_SHA512_Update
+#define SHA512_Final pg_SHA512_Final
 
 /*** SHA-256/384/512 Various Length Definitions ***********************/
 #define SHA256_BLOCK_LENGTH		64