Add SHA1 module

1 files changed, 199 insertions, 0 deletions

diff --git a/src/modules/m_sha1.cpp b/src/modules/m_sha1.cpp
new file mode 100644
index 000000000..5926e4926
--- /dev/null
+++ b/src/modules/m_sha1.cpp
@@ -0,0 +1,199 @@
+/*
+ * InspIRCd -- Internet Relay Chat Daemon
+ *
+ *   Copyright (C) 2016 Attila Molnar <attilamolnar@hush.com>
+ *
+ * This file is part of InspIRCd.  InspIRCd 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 <http://www.gnu.org/licenses/>.
+ */
+
+/*
+SHA-1 in C
+By Steve Reid <steve@edmweb.com>
+100% Public Domain
+*/
+
+#include "inspircd.h"
+#include "modules/hash.h"
+
+union CHAR64LONG16
+{
+	unsigned char c[64];
+	uint32_t l[16];
+};
+
+inline static uint32_t rol(uint32_t value, uint32_t bits) { return (value << bits) | (value >> (32 - bits)); }
+
+// blk0() and blk() perform the initial expand.
+// I got the idea of expanding during the round function from SSLeay
+static bool big_endian;
+inline static uint32_t blk0(CHAR64LONG16& block, uint32_t i)
+{
+	if (big_endian)
+		return block.l[i];
+	else
+		return block.l[i] = (rol(block.l[i], 24) & 0xFF00FF00) | (rol(block.l[i], 8) & 0x00FF00FF);
+}
+inline static uint32_t blk(CHAR64LONG16 &block, uint32_t i) { return block.l[i & 15] = rol(block.l[(i + 13) & 15] ^ block.l[(i + 8) & 15] ^ block.l[(i + 2) & 15] ^ block.l[i & 15],1); }
+
+// (R0+R1), R2, R3, R4 are the different operations used in SHA1
+inline static void R0(CHAR64LONG16& block, uint32_t v, uint32_t &w, uint32_t x, uint32_t y, uint32_t &z, uint32_t i) { z += ((w & (x ^ y)) ^ y) + blk0(block, i) + 0x5A827999 + rol(v, 5); w = rol(w, 30); }
+inline static void R1(CHAR64LONG16& block, uint32_t v, uint32_t &w, uint32_t x, uint32_t y, uint32_t &z, uint32_t i) { z += ((w & (x ^ y)) ^ y) + blk(block, i) + 0x5A827999 + rol(v, 5); w = rol(w, 30); }
+inline static void R2(CHAR64LONG16& block, uint32_t v, uint32_t &w, uint32_t x, uint32_t y, uint32_t &z, uint32_t i) { z += (w ^ x ^ y) + blk(block, i) + 0x6ED9EBA1 + rol(v, 5); w = rol(w, 30); }
+inline static void R3(CHAR64LONG16& block, uint32_t v, uint32_t &w, uint32_t x, uint32_t y, uint32_t &z, uint32_t i) { z += (((w | x) & y) | (w & x)) + blk(block, i) + 0x8F1BBCDC + rol(v, 5); w = rol(w, 30); }
+inline static void R4(CHAR64LONG16& block, uint32_t v, uint32_t &w, uint32_t x, uint32_t y, uint32_t &z, uint32_t i) { z += (w ^ x ^ y) + blk(block, i) + 0xCA62C1D6 + rol(v, 5); w = rol(w, 30); }
+
+static const uint32_t sha1_iv[5] =
+{
+	0x67452301, 0xEFCDAB89, 0x98BADCFE, 0x10325476, 0xC3D2E1F0
+};
+
+class SHA1Context
+{
+	uint32_t state[5];
+	uint32_t count[2];
+	unsigned char buffer[64];
+	unsigned char digest[20];
+
+	void Transform(const unsigned char buf[64])
+	{
+		uint32_t a, b, c, d, e;
+
+		CHAR64LONG16 block;
+		memcpy(block.c, buf, 64);
+
+		// Copy state[] to working vars
+		a = this->state[0];
+		b = this->state[1];
+		c = this->state[2];
+		d = this->state[3];
+		e = this->state[4];
+
+		// 4 rounds of 20 operations each. Loop unrolled.
+		R0(block, a, b, c, d, e, 0); R0(block, e, a, b, c, d, 1); R0(block, d, e, a, b, c, 2); R0(block, c, d, e, a, b, 3);
+		R0(block, b, c, d, e, a, 4); R0(block, a, b, c, d, e, 5); R0(block, e, a, b, c, d, 6); R0(block, d, e, a, b, c, 7);
+		R0(block, c, d, e, a, b, 8); R0(block, b, c, d, e, a, 9); R0(block, a, b, c, d, e, 10); R0(block, e, a, b, c, d, 11);
+		R0(block, d, e, a, b, c, 12); R0(block, c, d, e, a, b, 13); R0(block, b, c, d, e, a, 14); R0(block, a, b, c, d, e, 15);
+		R1(block, e, a, b, c, d, 16); R1(block, d, e, a, b, c, 17); R1(block, c, d, e, a, b, 18); R1(block, b, c, d, e, a, 19);
+		R2(block, a, b, c, d, e, 20); R2(block, e, a, b, c, d, 21); R2(block, d, e, a, b, c, 22); R2(block, c, d, e, a, b, 23);
+		R2(block, b, c, d, e, a, 24); R2(block, a, b, c, d, e, 25); R2(block, e, a, b, c, d, 26); R2(block, d, e, a, b, c, 27);
+		R2(block, c, d, e, a, b, 28); R2(block, b, c, d, e, a, 29); R2(block, a, b, c, d, e, 30); R2(block, e, a, b, c, d, 31);
+		R2(block, d, e, a, b, c, 32); R2(block, c, d, e, a, b, 33); R2(block, b, c, d, e, a, 34); R2(block, a, b, c, d, e, 35);
+		R2(block, e, a, b, c, d, 36); R2(block, d, e, a, b, c, 37); R2(block, c, d, e, a, b, 38); R2(block, b, c, d, e, a, 39);
+		R3(block, a, b, c, d, e, 40); R3(block, e, a, b, c, d, 41); R3(block, d, e, a, b, c, 42); R3(block, c, d, e, a, b, 43);
+		R3(block, b, c, d, e, a, 44); R3(block, a, b, c, d, e, 45); R3(block, e, a, b, c, d, 46); R3(block, d, e, a, b, c, 47);
+		R3(block, c, d, e, a, b, 48); R3(block, b, c, d, e, a, 49); R3(block, a, b, c, d, e, 50); R3(block, e, a, b, c, d, 51);
+		R3(block, d, e, a, b, c, 52); R3(block, c, d, e, a, b, 53); R3(block, b, c, d, e, a, 54); R3(block, a, b, c, d, e, 55);
+		R3(block, e, a, b, c, d, 56); R3(block, d, e, a, b, c, 57); R3(block, c, d, e, a, b, 58); R3(block, b, c, d, e, a, 59);
+		R4(block, a, b, c, d, e, 60); R4(block, e, a, b, c, d, 61); R4(block, d, e, a, b, c, 62); R4(block, c, d, e, a, b, 63);
+		R4(block, b, c, d, e, a, 64); R4(block, a, b, c, d, e, 65); R4(block, e, a, b, c, d, 66); R4(block, d, e, a, b, c, 67);
+		R4(block, c, d, e, a, b, 68); R4(block, b, c, d, e, a, 69); R4(block, a, b, c, d, e, 70); R4(block, e, a, b, c, d, 71);
+		R4(block, d, e, a, b, c, 72); R4(block, c, d, e, a, b, 73); R4(block, b, c, d, e, a, 74); R4(block, a, b, c, d, e, 75);
+		R4(block, e, a, b, c, d, 76); R4(block, d, e, a, b, c, 77); R4(block, c, d, e, a, b, 78); R4(block, b, c, d, e, a, 79);
+		// Add the working vars back into state[]
+		this->state[0] += a;
+		this->state[1] += b;
+		this->state[2] += c;
+		this->state[3] += d;
+		this->state[4] += e;
+	}
+
+ public:
+	SHA1Context()
+	{
+		for (int i = 0; i < 5; ++i)
+			this->state[i] = sha1_iv[i];
+
+		this->count[0] = this->count[1] = 0;
+		memset(this->buffer, 0, sizeof(this->buffer));
+		memset(this->digest, 0, sizeof(this->digest));
+	}
+
+	void Update(const unsigned char* data, size_t len)
+	{
+		uint32_t i, j;
+
+		j = (this->count[0] >> 3) & 63;
+		if ((this->count[0] += len << 3) < (len << 3))
+			++this->count[1];
+		this->count[1] += len >> 29;
+		if (j + len > 63)
+		{
+			memcpy(&this->buffer[j], data, (i = 64 - j));
+			this->Transform(this->buffer);
+			for (; i + 63 < len; i += 64)
+				this->Transform(&data[i]);
+			j = 0;
+		}
+		else
+			i = 0;
+		memcpy(&this->buffer[j], &data[i], len - i);
+	}
+
+	void Finalize()
+	{
+		uint32_t i;
+		unsigned char finalcount[8];
+
+		for (i = 0; i < 8; ++i)
+			finalcount[i] = static_cast<unsigned char>((this->count[i >= 4 ? 0 : 1] >> ((3 - (i & 3)) * 8)) & 255); /* Endian independent */
+		this->Update(reinterpret_cast<const unsigned char *>("\200"), 1);
+		while ((this->count[0] & 504) != 448)
+			this->Update(reinterpret_cast<const unsigned char *>("\0"), 1);
+		this->Update(finalcount, 8); // Should cause a SHA1Transform()
+		for (i = 0; i < 20; ++i)
+			this->digest[i] = static_cast<unsigned char>((this->state[i>>2] >> ((3 - (i & 3)) * 8)) & 255);
+
+		this->Transform(this->buffer);
+	}
+
+	std::string GetRaw() const
+	{
+		return std::string((const char*)digest, sizeof(digest));
+	}
+};
+
+class SHA1HashProvider : public HashProvider
+{
+ public:
+ 	SHA1HashProvider(Module* mod)
+		: HashProvider(mod, "hash/sha1", 20, 64)
+	{
+	}
+
+	std::string GenerateRaw(const std::string& data)
+	{
+		SHA1Context ctx;
+		ctx.Update(reinterpret_cast<const unsigned char*>(data.data()), data.length());
+		ctx.Finalize();
+		return ctx.GetRaw();
+	}
+};
+
+class ModuleSHA1 : public Module
+{
+	SHA1HashProvider sha1;
+
+ public:
+	ModuleSHA1()
+		: sha1(this)
+	{
+		big_endian = (htonl(1337) == 1337);
+	}
+
+	Version GetVersion()
+	{
+		return Version("Implements SHA-1 hashing", VF_VENDOR);
+	}
+};
+
+MODULE_INIT(ModuleSHA1)