Remove main from libdispass, add test executable

- Add ~dispasstest~ which is used to test the DisPass algorithms.
- Remove =main= from libdispass since shared libraries shouldn't have
  main functions
- Add ~dispass.h~ which defines and exports the DisPass algorithms.
- Make some functions in ~dispass.c~ static to make clear they're not
  exported anywhere.

.gitignore

@@ -1,2 +1,3 @@
 *.o
 *.so
+dispasstest

Makefile

@@ -2,3 +2,6 @@ CFLAGS = -lcrypto -fPIC
 
 libdispass.so: dispass.o
 	$(CC) $(CFLAGS) -shared -o libdispass.so $^
+
+dispasstest: libdispass.so dispasstest.o
+	$(CC) -o dispasstest -L. -ldispass dispasstest.o

README.org

@@ -3,9 +3,9 @@
 A simple test executable (should be converted to library) of [[https://babab.nl][Benjamin
 Althues]]' DisPass algorithms.
 
-To run:
+To run a test:
 
-: make && ./dispasstest
+: make dispasstest && LD_LIBRARY_PATH=. ./dispasstest
 
 It should output 4 lines with the hashed passphrases copied from the
 DisPass algorithms' doctests.

dispass.c

@@ -4,10 +4,12 @@
 #include <openssl/pem.h>
 #include <limits.h>
 
+#include "dispass.h"
+
 #define MIN(A, B) ((A) < (B) ? (A) : (B))
 #define MAXLEN (SHA512_DIGEST_LENGTH * 2)
 
-char *
+static char *
 base64encode(const void *data, int len)
 { /* Copied from http://stackoverflow.com/a/16511093/459915 */
     BIO *b64_bio, *mem_bio;
@@ -34,7 +36,7 @@ base64encode(const void *data, int len)
     return ret;
 }
 
-void
+static void
 sha512_to_string(unsigned char *data, char *buff)
 {
     int i;
@@ -46,7 +48,7 @@ sha512_to_string(unsigned char *data, char *buff)
     }
 }
 
-void
+static void
 rmchar(char rm, char **s)
 {
     int i, j = 0;
@@ -114,25 +116,3 @@ dispass2(char *label, char *password, int len, long long unsigned seqno)
 
     return b64;
 }
-
-int main(int argc, char *argv[])
-{
-    char *test1, *test2, *test3, *test4;
-
-    test1 = dispass1("test", "qqqqqqqq", 30, 0);
-    test2 = dispass1("test2", "qqqqqqqq", 50, 0);
-    test3 = dispass2("test", "qqqqqqqq", 30, 1);
-    test4 = dispass2("test2", "qqqqqqqq", 50, 10);
-
-    printf("%s\n", test1);
-    printf("%s\n", test2);
-    printf("%s\n", test3);
-    printf("%s\n", test4);
-
-    free(test1);
-    free(test2);
-    free(test3);
-    free(test4);
-
-    return 0;
-}

dispass.h

@@ -0,0 +1,7 @@
+#ifndef DISPASS_H
+#define DISPASS_H
+
+char *dispass1(char *label, char *password, int len, long long unsigned seqno);
+char *dispass2(char *label, char *password, int len, long long unsigned seqno);
+
+#endif  /* DISPASS_H */

dispasstest.c

@@ -0,0 +1,26 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "dispass.h"
+
+int main(int argc, char *argv[])
+{
+    char *test1, *test2, *test3, *test4;
+
+    test1 = dispass1("test", "qqqqqqqq", 30, 0);
+    test2 = dispass1("test2", "qqqqqqqq", 50, 0);
+    test3 = dispass2("test", "qqqqqqqq", 30, 1);
+    test4 = dispass2("test2", "qqqqqqqq", 50, 10);
+
+    printf("%s\n", test1);
+    printf("%s\n", test2);
+    printf("%s\n", test3);
+    printf("%s\n", test4);
+
+    free(test1);
+    free(test2);
+    free(test3);
+    free(test4);
+
+    return 0;
+}