1 files changed, 25 insertions, 0 deletions
diff --git a/2016/5a.c b/2016/5a.c
new file mode 100644
index 0000000..d8bbd7f
--- /dev/null
+++ b/2016/5a.c
@@ -0,0 +1,25 @@
+#include <stdio.h>
+#include <stdbool.h>
+#include <openssl/md5.h>
+
+int main(void){
+	int counter=0;
+	char inbuf[100];
+	unsigned char outbuf[16];
+	int prelen;
+	scanf("%s%n",inbuf,&prelen);
+
+	for(int i=0;i<8;i++){
+		while(true){
+			int len=prelen+sprintf(inbuf+prelen,"%d",counter);
+			counter++;
+			MD5((const unsigned char*)inbuf,len,outbuf);
+			if(outbuf[0]==0&&outbuf[1]==0&&(outbuf[2]>>4)==0){
+				putchar("0123456789abcdef"[outbuf[2]&0xf]);
+				fflush(stdout);
+				break;
+			}
+		}
+	}
+	putchar('\n');
+}