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diff --git a/modules/encryption/md5.cpp b/modules/encryption/md5.cpp
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+/*
+ * Anope IRC Services
+ *
+ * Copyright (C) 2006-2017 Anope Team <team@anope.org>
+ *
+ * This file is part of Anope. Anope is free software; you can
+ * redistribute it and/or modify it under the terms of the GNU
+ * General Public License as published by the Free Software
+ * Foundation, version 2.
+ *
+ * This program 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 this program; if not, see see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * Taken from IRC Services and is copyright (c) 1996-2002 Andrew Church.
+ * E-mail: <achurch@achurch.org>
+ * Parts written by Andrew Kempe and others.
+ */
+
+#include "module.h"
+#include "modules/encryption.h"
+
+/* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
+rights reserved.
+
+License to copy and use this software is granted provided that it
+is identified as the "RSA Data Security, Inc. MD5 Message-Digest
+Algorithm" in all material mentioning or referencing this software
+or this function.
+
+License is also granted to make and use derivative works provided
+that such works are identified as "derived from the RSA Data
+Security, Inc. MD5 Message-Digest Algorithm" in all material
+mentioning or referencing the derived work.
+
+RSA Data Security, Inc. makes no representations concerning either
+the merchantability of this software or the suitability of this
+software for any particular purpose. It is provided "as is"
+without express or implied warranty of any kind.
+
+These notices must be retained in any copies of any part of this
+documentation and/or software.
+ */
+
+static unsigned char PADDING[64] = {
+ 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+};
+
+/* F, G, H and I are basic MD5 functions.
+ */
+inline static unsigned F(unsigned x, unsigned y, unsigned z) { return (x & y) | (~x & z); }
+inline static unsigned G(unsigned x, unsigned y, unsigned z) { return (x & z) | (y & ~z); }
+inline static unsigned H(unsigned x, unsigned y, unsigned z) { return x ^ y ^ z; }
+inline static unsigned I(unsigned x, unsigned y, unsigned z) { return y ^ (x | ~z); }
+
+/* ROTATE_LEFT rotates x left n bits.
+ */
+inline static unsigned ROTATE_LEFT(unsigned x, unsigned n) { return (x << n) | (x >> (32 - n)); }
+
+/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
+ * Rotation is separate from addition to prevent recomputation.
+ */
+inline static void FF(unsigned &a, unsigned b, unsigned c, unsigned d, unsigned x, unsigned s, unsigned ac)
+{
+ a += F(b, c, d) + x + ac;
+ a = ROTATE_LEFT(a, s);
+ a += b;
+}
+inline static void GG(unsigned &a, unsigned b, unsigned c, unsigned d, unsigned x, unsigned s, unsigned ac)
+{
+ a += G(b, c, d) + x + ac;
+ a = ROTATE_LEFT(a, s);
+ a += b;
+}
+inline static void HH(unsigned &a, unsigned b, unsigned c, unsigned d, unsigned x, unsigned s, unsigned ac)
+{
+ a += H(b, c, d) + x + ac;
+ a = ROTATE_LEFT(a, s);
+ a += b;
+}
+inline static void II(unsigned &a, unsigned b, unsigned c, unsigned d, unsigned x, unsigned s, unsigned ac)
+{
+ a += I(b, c, d) + x + ac;
+ a = ROTATE_LEFT(a, s);
+ a += b;
+}
+
+static const uint32_t md5_iv[4] =
+{
+ 0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476
+};
+
+class MD5Context : public Encryption::Context
+{
+ unsigned state[4]; /* state (ABCD) */
+ unsigned count[2]; /* number of bits, modulo 2^64 (lsb first) */
+ unsigned char buffer[64]; /* input buffer */
+ unsigned char digest[16]; /* final digest */
+
+ /* Constants for MD5Transform routine.
+ */
+ enum
+ {
+ S11 = 7,
+ S12 = 12,
+ S13 = 17,
+ S14 = 22,
+ S21 = 5,
+ S22 = 9,
+ S23 = 14,
+ S24 = 20,
+ S31 = 4,
+ S32 = 11,
+ S33 = 16,
+ S34 = 23,
+ S41 = 6,
+ S42 = 10,
+ S43 = 15,
+ S44 = 21
+ };
+
+ /* MD5 basic transformation. Transforms state based on block.
+ */
+ void Transform(const unsigned char block[64])
+ {
+ unsigned a = state[0], b = state[1], c = state[2], d = state[3], x[16];
+
+ Decode(x, block, 64);
+
+ /* Round 1 */
+ FF(a, b, c, d, x[0], S11, 0xd76aa478); /* 1 */
+ FF(d, a, b, c, x[1], S12, 0xe8c7b756); /* 2 */
+ FF(c, d, a, b, x[2], S13, 0x242070db); /* 3 */
+ FF(b, c, d, a, x[3], S14, 0xc1bdceee); /* 4 */
+ FF(a, b, c, d, x[4], S11, 0xf57c0faf); /* 5 */
+ FF(d, a, b, c, x[5], S12, 0x4787c62a); /* 6 */
+ FF(c, d, a, b, x[6], S13, 0xa8304613); /* 7 */
+ FF(b, c, d, a, x[7], S14, 0xfd469501); /* 8 */
+ FF(a, b, c, d, x[8], S11, 0x698098d8); /* 9 */
+ FF(d, a, b, c, x[9], S12, 0x8b44f7af); /* 10 */
+ FF(c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
+ FF(b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
+ FF(a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
+ FF(d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
+ FF(c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
+ FF(b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
+
+ /* Round 2 */
+ GG(a, b, c, d, x[1], S21, 0xf61e2562); /* 17 */
+ GG(d, a, b, c, x[6], S22, 0xc040b340); /* 18 */
+ GG(c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
+ GG(b, c, d, a, x[0], S24, 0xe9b6c7aa); /* 20 */
+ GG(a, b, c, d, x[5], S21, 0xd62f105d); /* 21 */
+ GG(d, a, b, c, x[10], S22, 0x2441453); /* 22 */
+ GG(c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
+ GG(b, c, d, a, x[4], S24, 0xe7d3fbc8); /* 24 */
+ GG(a, b, c, d, x[9], S21, 0x21e1cde6); /* 25 */
+ GG(d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
+ GG(c, d, a, b, x[3], S23, 0xf4d50d87); /* 27 */
+ GG(b, c, d, a, x[8], S24, 0x455a14ed); /* 28 */
+ GG(a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
+ GG(d, a, b, c, x[2], S22, 0xfcefa3f8); /* 30 */
+ GG(c, d, a, b, x[7], S23, 0x676f02d9); /* 31 */
+ GG(b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
+
+ /* Round 3 */
+ HH(a, b, c, d, x[5], S31, 0xfffa3942); /* 33 */
+ HH(d, a, b, c, x[8], S32, 0x8771f681); /* 34 */
+ HH(c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
+ HH(b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
+ HH(a, b, c, d, x[1], S31, 0xa4beea44); /* 37 */
+ HH(d, a, b, c, x[4], S32, 0x4bdecfa9); /* 38 */
+ HH(c, d, a, b, x[7], S33, 0xf6bb4b60); /* 39 */
+ HH(b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
+ HH(a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
+ HH(d, a, b, c, x[0], S32, 0xeaa127fa); /* 42 */
+ HH(c, d, a, b, x[3], S33, 0xd4ef3085); /* 43 */
+ HH(b, c, d, a, x[6], S34, 0x4881d05); /* 44 */
+ HH(a, b, c, d, x[9], S31, 0xd9d4d039); /* 45 */
+ HH(d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
+ HH(c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
+ HH(b, c, d, a, x[2], S34, 0xc4ac5665); /* 48 */
+
+ /* Round 4 */
+ II(a, b, c, d, x[0], S41, 0xf4292244); /* 49 */
+ II(d, a, b, c, x[7], S42, 0x432aff97); /* 50 */
+ II(c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
+ II(b, c, d, a, x[5], S44, 0xfc93a039); /* 52 */
+ II(a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
+ II(d, a, b, c, x[3], S42, 0x8f0ccc92); /* 54 */
+ II(c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
+ II(b, c, d, a, x[1], S44, 0x85845dd1); /* 56 */
+ II(a, b, c, d, x[8], S41, 0x6fa87e4f); /* 57 */
+ II(d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
+ II(c, d, a, b, x[6], S43, 0xa3014314); /* 59 */
+ II(b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
+ II(a, b, c, d, x[4], S41, 0xf7537e82); /* 61 */
+ II(d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
+ II(c, d, a, b, x[2], S43, 0x2ad7d2bb); /* 63 */
+ II(b, c, d, a, x[9], S44, 0xeb86d391); /* 64 */
+
+ state[0] += a;
+ state[1] += b;
+ state[2] += c;
+ state[3] += d;
+
+ /* Zeroize sensitive information. */
+ memset(x, 0, sizeof(x));
+ }
+
+ /* Encodes input (unsigned) into output (unsigned char). Assumes len is
+ * a multiple of 4.
+ */
+ void Encode(unsigned char *output, unsigned *input, unsigned len)
+ {
+ for (unsigned i = 0, j = 0; j < len; ++i, j += 4)
+ {
+ output[j] = static_cast<unsigned char>(input[i] & 0xff);
+ output[j + 1] = static_cast<unsigned char>((input[i] >> 8) & 0xff);
+ output[j + 2] = static_cast<unsigned char>((input[i] >> 16) & 0xff);
+ output[j + 3] = static_cast<unsigned char>((input[i] >> 24) & 0xff);
+ }
+ }
+
+ /* Decodes input (unsigned char) into output (unsigned). Assumes len is
+ * a multiple of 4.
+ */
+ void Decode(unsigned *output, const unsigned char *input, unsigned len)
+ {
+ for (unsigned i = 0, j = 0; j < len; ++i, j += 4)
+ output[i] = static_cast<unsigned>(input[j]) | (static_cast<unsigned>(input[j + 1]) << 8) | (static_cast<unsigned>(input[j + 2]) << 16) | (static_cast<unsigned>(input[j + 3]) << 24);
+ }
+
+ public:
+ MD5Context(Encryption::IV *iv = NULL)
+ {
+ if (iv != NULL)
+ {
+ if (iv->second != 4)
+ throw CoreException("Invalid IV size");
+ /* Load magic initialization constants. */
+ for (int i = 0; i < 4; ++i)
+ this->state[i] = iv->first[i];
+ }
+ else
+ for (int i = 0; i < 4; ++i)
+ this->state[i] = md5_iv[i];
+
+ this->count[0] = this->count[1] = 0;
+ memset(this->buffer, 0, sizeof(this->buffer));
+ }
+
+ /* MD5 block update operation. Continues an MD5 message-digest
+ * operation, processing another message block, and updating the
+ * context.
+ */
+ void Update(const unsigned char *input, size_t len) override
+ {
+ unsigned i, index, partLen;
+
+ /* Compute number of bytes mod 64 */
+ index = (this->count[0] >> 3) & 0x3F;
+
+ /* Update number of bits */
+ if ((this->count[0] += len << 3) < (len << 3))
+ ++this->count[1];
+ this->count[1] += len >> 29;
+
+ partLen = 64 - index;
+
+ /* Transform as many times as possible. */
+ if (len >= partLen)
+ {
+ memcpy(&this->buffer[index], input, partLen);
+ this->Transform(this->buffer);
+
+ for (i = partLen; i + 63 < len; i += 64)
+ this->Transform(&input[i]);
+
+ index = 0;
+ }
+ else
+ i = 0;
+
+ /* Buffer remaining input */
+ memcpy(&this->buffer[index], &input[i], len - i);
+ }
+
+ /* MD5 finalization. Ends an MD5 message-digest opera
+ * the message digest and zeroizing the context.
+ */
+ void Finalize() override
+ {
+ unsigned char bits[8];
+ unsigned index, padLen;
+
+ /* Save number of bits */
+ this->Encode(bits, this->count, 8);
+
+ /* Pad out to 56 mod 64. */
+ index = (this->count[0] >> 3) & 0x3f;
+ padLen = index < 56 ? 56 - index : 120 - index;
+ this->Update(PADDING, padLen);
+
+ /* Append length (before padding) */
+ this->Update(bits, 8);
+ /* Store state in digest */
+ this->Encode(digest, this->state, 16);
+
+ /* Zeroize sensitive information. */
+ memset(this->state, 0, sizeof(this->state));
+ memset(this->count, 0, sizeof(this->count));
+ memset(this->buffer, 0, sizeof(this->buffer));
+ }
+
+ Encryption::Hash GetFinalizedHash() override
+ {
+ Encryption::Hash hash;
+ hash.first = this->digest;
+ hash.second = sizeof(this->digest);
+ return hash;
+ }
+};
+
+class MD5Provider : public Encryption::Provider
+{
+ public:
+ MD5Provider(Module *creator) : Encryption::Provider(creator, "md5") { }
+
+ Encryption::Context *CreateContext(Encryption::IV *iv) override
+ {
+ return new MD5Context(iv);
+ }
+
+ Encryption::IV GetDefaultIV() override
+ {
+ Encryption::IV iv;
+ iv.first = md5_iv;
+ iv.second = sizeof(md5_iv) / sizeof(uint32_t);
+ return iv;
+ }
+};
+
+class EMD5 : public Module
+ , public EventHook<Event::Encrypt>
+ , public EventHook<Event::CheckAuthentication>
+{
+ MD5Provider md5provider;
+
+ public:
+ EMD5(const Anope::string &modname, const Anope::string &creator) : Module(modname, creator, ENCRYPTION | VENDOR)
+ , EventHook<Event::Encrypt>(this)
+ , EventHook<Event::CheckAuthentication>(this)
+ , md5provider(this)
+ {
+ if (ModuleManager::FindFirstOf(ENCRYPTION) == this)
+ throw ModuleException("enc_md5 is deprecated and can not be used as a primary encryption method");
+ }
+
+ EventReturn OnEncrypt(const Anope::string &src, Anope::string &dest) override
+ {
+ MD5Context context;
+
+ context.Update(reinterpret_cast<const unsigned char *>(src.c_str()), src.length());
+ context.Finalize();
+
+ Encryption::Hash hash = context.GetFinalizedHash();
+
+ Anope::string buf = "md5:" + Anope::Hex(reinterpret_cast<const char *>(hash.first), hash.second);
+
+ logger.Debug2("hashed password from [{0}] to [{1}]", src, buf);
+ dest = buf;
+ return EVENT_ALLOW;
+ }
+
+ void OnCheckAuthentication(User *, NickServ::IdentifyRequest *req) override
+ {
+ NickServ::Nick *na = NickServ::FindNick(req->GetAccount());
+ if (na == NULL)
+ return;
+ NickServ::Account *nc = na->GetAccount();
+
+ size_t pos = nc->GetPassword().find(':');
+ if (pos == Anope::string::npos)
+ return;
+ Anope::string hash_method(nc->GetPassword().begin(), nc->GetPassword().begin() + pos);
+ if (!hash_method.equals_cs("md5"))
+ return;
+
+ Anope::string buf;
+ this->OnEncrypt(req->GetPassword(), buf);
+ if (nc->GetPassword().equals_cs(buf))
+ {
+ /* if we are NOT the first module in the list,
+ * we want to re-encrypt the pass with the new encryption
+ */
+ if (ModuleManager::FindFirstOf(ENCRYPTION) != this)
+ {
+ Anope::string p;
+ Anope::Encrypt(req->GetPassword(), p);
+ nc->SetPassword(p);
+ }
+ req->Success(this);
+ }
+ }
+};
+
+MODULE_INIT(EMD5)
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