diff --git a/common/CMakeLists.txt b/common/CMakeLists.txt
index 22f2ff07c7..9a855288ec 100644
--- a/common/CMakeLists.txt
+++ b/common/CMakeLists.txt
@@ -24,6 +24,7 @@ target_sources(common PRIVATE
IniInterface.cpp
Mutex.cpp
Misc.cpp
+ MD5Digest.cpp
PathUtils.cpp
PrecompiledHeader.cpp
Perf.cpp
@@ -79,6 +80,7 @@ target_sources(common PRIVATE
HashCombine.h
MemcpyFast.h
MemsetFast.inl
+ MD5Digest.h
Path.h
PageFaultSource.h
PrecompiledHeader.h
diff --git a/common/MD5Digest.cpp b/common/MD5Digest.cpp
new file mode 100644
index 0000000000..98cb1e1ce2
--- /dev/null
+++ b/common/MD5Digest.cpp
@@ -0,0 +1,222 @@
+/* PCSX2 - PS2 Emulator for PCs
+ * Copyright (C) 2002-2021 PCSX2 Dev Team
+ *
+ * PCSX2 is free software: you can redistribute it and/or modify it under the terms
+ * of the GNU Lesser General Public License as published by the Free Software Found-
+ * ation, either version 3 of the License, or (at your option) any later version.
+ *
+ * PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with PCSX2.
+ * If not, see .
+ */
+
+#include "MD5Digest.h"
+#include
+
+// mostly based on this implementation (public domain): http://www.fourmilab.ch/md5/
+
+/* The four core functions - F1 is optimized somewhat */
+
+/* #define F1(x, y, z) (x & y | ~x & z) */
+#define F1(x, y, z) (z ^ (x & (y ^ z)))
+#define F2(x, y, z) F1(z, x, y)
+#define F3(x, y, z) (x ^ y ^ z)
+#define F4(x, y, z) (y ^ (x | ~z))
+
+/* This is the central step in the MD5 algorithm. */
+#define MD5STEP(f, w, x, y, z, data, s) (w += f(x, y, z) + data, w = w << s | w >> (32 - s), w += x)
+
+/*
+ * The core of the MD5 algorithm, this alters an existing MD5 hash to
+ * reflect the addition of 16 longwords of new data. MD5Update blocks
+ * the data and converts bytes into longwords for this routine.
+ */
+static void MD5Transform(u32 buf[4], u32 in[16])
+{
+ u32 a, b, c, d;
+
+ a = buf[0];
+ b = buf[1];
+ c = buf[2];
+ d = buf[3];
+
+ MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
+ MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
+ MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
+ MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
+ MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
+ MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
+ MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
+ MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
+ MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
+ MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
+ MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
+ MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
+ MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
+ MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
+ MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
+ MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
+
+ MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
+ MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
+ MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
+ MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
+ MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
+ MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
+ MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
+ MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
+ MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
+ MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
+ MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
+ MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
+ MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
+ MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
+ MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
+ MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
+
+ MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
+ MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
+ MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
+ MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
+ MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
+ MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
+ MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
+ MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
+ MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
+ MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
+ MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
+ MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
+ MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
+ MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
+ MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
+ MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
+
+ MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
+ MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
+ MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
+ MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
+ MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
+ MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
+ MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
+ MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
+ MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
+ MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
+ MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
+ MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
+ MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
+ MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
+ MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
+ MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
+
+ buf[0] += a;
+ buf[1] += b;
+ buf[2] += c;
+ buf[3] += d;
+}
+
+MD5Digest::MD5Digest()
+{
+ Reset();
+}
+
+void MD5Digest::Reset()
+{
+ buf[0] = 0x67452301;
+ buf[1] = 0xefcdab89;
+ buf[2] = 0x98badcfe;
+ buf[3] = 0x10325476;
+
+ bits[0] = 0;
+ bits[1] = 0;
+
+ std::memset(in, 0, sizeof(in));
+}
+
+void MD5Digest::Update(const void* pData, u32 cbData)
+{
+ u32 t;
+ const u8* pByteData = reinterpret_cast(pData);
+
+ /* Update bitcount */
+
+ t = this->bits[0];
+ if ((this->bits[0] = t + ((u32)cbData << 3)) < t)
+ this->bits[1]++; /* Carry from low to high */
+ this->bits[1] += cbData >> 29;
+
+ t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */
+
+ /* Handle any leading odd-sized chunks */
+
+ if (t)
+ {
+ u8* p = (u8*)this->in + t;
+
+ t = 64 - t;
+ if (cbData < t)
+ {
+ std::memcpy(p, pByteData, cbData);
+ return;
+ }
+ std::memcpy(p, pByteData, t);
+ MD5Transform(this->buf, (u32*)this->in);
+ pByteData += t;
+ cbData -= t;
+ }
+ /* Process data in 64-byte chunks */
+
+ while (cbData >= 64)
+ {
+ std::memcpy(this->in, pByteData, 64);
+ MD5Transform(this->buf, (u32*)this->in);
+ pByteData += 64;
+ cbData -= 64;
+ }
+
+ /* Handle any remaining bytes of data. */
+
+ std::memcpy(this->in, pByteData, cbData);
+}
+
+void MD5Digest::Final(u8 Digest[16])
+{
+ u32 count;
+ u8* p;
+
+ /* Compute number of bytes mod 64 */
+ count = (this->bits[0] >> 3) & 0x3F;
+
+ /* Set the first char of padding to 0x80. This is safe since there is
+ always at least one byte free */
+ p = this->in + count;
+ *p++ = 0x80;
+
+ /* Bytes of padding needed to make 64 bytes */
+ count = 64 - 1 - count;
+
+ /* Pad out to 56 mod 64 */
+ if (count < 8)
+ {
+ /* Two lots of padding: Pad the first block to 64 bytes */
+ std::memset(p, 0, count);
+ MD5Transform(this->buf, (u32*)this->in);
+
+ /* Now fill the next block with 56 bytes */
+ std::memset(this->in, 0, 56);
+ }
+ else
+ {
+ /* Pad block to 56 bytes */
+ std::memset(p, 0, count - 8);
+ }
+
+ /* Append length in bits and transform */
+ ((u32*)this->in)[14] = this->bits[0];
+ ((u32*)this->in)[15] = this->bits[1];
+
+ MD5Transform(this->buf, (u32*)this->in);
+ std::memcpy(Digest, this->buf, 16);
+}
diff --git a/common/MD5Digest.h b/common/MD5Digest.h
new file mode 100644
index 0000000000..40016f4465
--- /dev/null
+++ b/common/MD5Digest.h
@@ -0,0 +1,32 @@
+/* PCSX2 - PS2 Emulator for PCs
+ * Copyright (C) 2002-2021 PCSX2 Dev Team
+ *
+ * PCSX2 is free software: you can redistribute it and/or modify it under the terms
+ * of the GNU Lesser General Public License as published by the Free Software Found-
+ * ation, either version 3 of the License, or (at your option) any later version.
+ *
+ * PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with PCSX2.
+ * If not, see .
+ */
+
+#pragma once
+#include "Pcsx2Types.h"
+
+class MD5Digest
+{
+public:
+ MD5Digest();
+
+ void Update(const void* pData, u32 cbData);
+ void Final(u8 Digest[16]);
+ void Reset();
+
+private:
+ u32 buf[4];
+ u32 bits[2];
+ u8 in[64];
+};
diff --git a/common/common.vcxproj b/common/common.vcxproj
index 3b5422402b..5b1d8a9870 100644
--- a/common/common.vcxproj
+++ b/common/common.vcxproj
@@ -54,6 +54,7 @@
+
@@ -113,6 +114,7 @@
+
diff --git a/common/common.vcxproj.filters b/common/common.vcxproj.filters
index 3c7014fd22..05369d0ef6 100644
--- a/common/common.vcxproj.filters
+++ b/common/common.vcxproj.filters
@@ -142,6 +142,9 @@
Source Files
+
+ Source Files
+
@@ -333,6 +336,9 @@
Header Files
+
+ Header Files
+