feat: implement MD5 algorithm

test/MD5.cpp

@@ -0,0 +1,55 @@
+#include "common/MD5.hpp"
+#include "test/Test.hpp"
+
+#include <cstdio>
+#include <cstring>
+
+static bool test_hash(const char* data, const char* expected, int length = -1) {
+    const size_t digestLength = 16;
+
+    uint8_t digest[digestLength] = {};
+    char hex[(2 * digestLength) + 1];
+
+    if (length < 0) {
+        length = strlen(data);
+    }
+
+    /* calculate hash */
+    MD5_CTX context;
+    MD5Init(&context);
+    MD5Update(&context, data, static_cast<size_t>(length));
+    MD5Final(digest, &context);
+
+    /* copy hash to string */
+    for (size_t i = 0; i < digestLength; i++) {
+        sprintf(&(hex[i * 2]), "%02x", digest[i]);
+    }
+    hex[digestLength * 2] = '\0';
+
+    /* compare with result string */
+    return strcmp(hex, expected) == 0;
+}
+
+TEST_CASE("MD5", "[md5]") {
+    SECTION("zero data") {
+        REQUIRE(test_hash("", "d41d8cd98f00b204e9800998ecf8427e"));
+    }
+    SECTION("test 1") {
+        REQUIRE(test_hash("a", "0cc175b9c0f1b6a831c399e269772661"));
+    }
+    SECTION("test 2") {
+        REQUIRE(test_hash("abc", "900150983cd24fb0d6963f7d28e17f72"));
+    }
+    SECTION("test 3") {
+        REQUIRE(test_hash(
+            "12345678901234567890123456789012345678901234567890123456789012345678901234567890",
+            "57edf4a22be3c955ac49da2e2107b67a"));
+    }
+    SECTION("binary array test") {
+        char data[8192];
+        for (size_t i = 0; i < sizeof(data); ++i) {
+            data[i] = static_cast<char>(i % 256);
+        }
+        test_hash(data, "6556112372898c69e1de0bf689d8db26", sizeof(data));
+    }
+}