start of md5 sum.

1 files changed, 44 insertions, 0 deletions

diff --git a/md5.c b/md5.c
new file mode 100644
index 0000000..ed5e1fa
--- /dev/null
+++ b/md5.c
@@ -0,0 +1,44 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#if defined(__APPLE__)
+#  define COMMON_DIGEST_FOR_OPENSSL
+#  include <CommonCrypto/CommonDigest.h>
+#  define SHA1 CC_SHA1
+#else
+#  include <openssl/md5.h>
+#endif
+
+int main(int argc, const char *argv[])
+{
+	const char *filename = argv[1];
+  int length = 4;
+	MD5_CTX c;
+	unsigned char digest[16];
+	char *md5 = (char*)malloc(33);
+  char *str = "blah";
+
+	MD5_Init(&c);
+
+	while (length > 0) {
+		if (length > 512) {
+			MD5_Update(&c, str, 512);
+		} else {
+			MD5_Update(&c, str, length);
+		}
+		length -= 512;
+		str += 512;
+	}
+
+	MD5_Final(digest, &c);
+
+	for (int i = 0; i < 16; ++i) {
+		snprintf(&(md5[i*2]), 16*2, "%02x", (unsigned int)digest[i]);
+	}
+
+  printf("%s (%s) = %s\n", "MD5", filename, md5);
+	return 0;
+}
+