Adds support for salted MD5 passwords (username+password concatenated) like in pg_shadow-table.

Auth_PG_encrypted ON
Auth_PG_hash_type MD5PGSQL

--- libapache2-mod-auth-pgsql-2.0.3-orig/mod_auth_pgsql.c	2006-01-05 15:15:13.000000000 +0100
+++ libapache2-mod-auth-pgsql-2.0.3/mod_auth_pgsql.c	2010-02-14 18:28:11.000000000 +0100
@@ -142,6 +142,7 @@
 #define AUTH_PG_HASH_TYPE_CRYPT 	1
 #define AUTH_PG_HASH_TYPE_MD5   	2
 #define AUTH_PG_HASH_TYPE_BASE64	3
+#define AUTH_PG_HASH_TYPE_MD5PGSQL	4
 
 
 typedef struct {
@@ -268,6 +269,8 @@
 
 	if (!strcasecmp(hash_type, "MD5"))
 		sec->auth_pg_hash_type = AUTH_PG_HASH_TYPE_MD5;
+	else if (!strcasecmp(hash_type, "MD5PGSQL"))
+		sec->auth_pg_hash_type = AUTH_PG_HASH_TYPE_MD5PGSQL;
 	else if (!strcasecmp(hash_type, "CRYPT"))
 		sec->auth_pg_hash_type = AUTH_PG_HASH_TYPE_CRYPT;
 	else if (!strcasecmp(hash_type, "BASE64"))
@@ -753,6 +756,7 @@
 	char *sent_pw, *real_pw;
 	int res;
 	char *user;
+	char bss[MAX_STRING_LEN];
 
 	if ((res = ap_get_basic_auth_pw(r, (const char **) &sent_pw)))
 		return res;
@@ -837,6 +841,13 @@
 		case AUTH_PG_HASH_TYPE_MD5:
 			sent_pw = auth_pg_md5(sent_pw);
 			break;
+		case AUTH_PG_HASH_TYPE_MD5PGSQL:
+			bss[0] = '\0';
+			apr_snprintf(bss, MAX_STRING_LEN, "%s%s",sent_pw,user);
+			sent_pw = bss;
+			sent_pw = auth_pg_md5(bss);
+			sec->auth_pg_hash_type=AUTH_PG_HASH_TYPE_MD5PGSQL;
+			break;
 		case AUTH_PG_HASH_TYPE_CRYPT:
 			sent_pw = (char *) crypt(sent_pw, real_pw);
 			break;