1 files changed, 30 insertions, 0 deletions
diff --git a/src/2015/day4/md5.h b/src/2015/day4/md5.h
new file mode 100644
index 0000000..2726e41
--- /dev/null
+++ b/src/2015/day4/md5.h
@@ -0,0 +1,30 @@
+#pragma once
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+extern "C" {
+typedef struct {
+  uint64_t size;      // Size of input in bytes
+  uint32_t buffer[4]; // Current accumulation of hash
+  uint8_t input[64];  // Input to be used in the next step
+  uint8_t digest[16]; // Result of algorithm
+} MD5Context;
+
+void md5Init(MD5Context* ctx);
+void md5Update(MD5Context* ctx, uint8_t* input, size_t input_len);
+void md5Finalize(MD5Context* ctx);
+void md5Step(uint32_t* buffer, uint32_t* input);
+
+uint8_t* md5String(char* input);
+uint8_t* md5File(FILE* file);
+
+uint32_t F(uint32_t X, uint32_t Y, uint32_t Z);
+uint32_t G(uint32_t X, uint32_t Y, uint32_t Z);
+uint32_t H(uint32_t X, uint32_t Y, uint32_t Z);
+uint32_t I(uint32_t X, uint32_t Y, uint32_t Z);
+
+uint32_t rotateLeft(uint32_t x, uint32_t n);
+}