Seperate out sha256 into m_sha256.so. API is identical to MD5 except where the class names are MD5 for MD5, these are SHA256... duh ;)

Now we're left with a dialemma - is m_opersha256.cpp now pointless? Does anyone use both sha256 and md5 together? Should we just rename this to m_oper_hash, and have them pick their encryption in the config? :P


git-svn-id: http://svn.inspircd.org/repository/trunk/inspircd@5858 e03df62e-2008-0410-955e-edbf42e46eb7

1 files changed, 316 insertions, 0 deletions

diff --git a/src/modules/m_sha256.cpp b/src/modules/m_sha256.cpp
new file mode 100644
index 000000000..f446633b6
--- /dev/null
+++ b/src/modules/m_sha256.cpp
@@ -0,0 +1,316 @@
+/*       +------------------------------------+
+ *       | Inspire Internet Relay Chat Daemon |
+ *       +------------------------------------+
+ *
+ *  InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
+ *                       E-mail:
+ *                <brain@chatspike.net>
+ *                <Craig@chatspike.net>
+ *     
+ * Written by Craig Edwards, Craig McLure, and others.
+ * This program is free but copyrighted software; see
+ *            the file COPYING for details.
+ *
+ * ---------------------------------------------------
+ */
+
+/* m_sha256 - Based on m_opersha256 written by Special <john@yarbbles.com>
+ * Modified and improved by Craig Edwards, December 2006.
+ *
+ *
+ * FIPS 180-2 SHA-224/256/384/512 implementation
+ * Last update: 05/23/2005
+ * Issue date:  04/30/2005
+ *
+ * Copyright (C) 2005 Olivier Gay <olivier.gay@a3.epfl.ch>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/* $ModDesc: Allows for SHA-256 encrypted oper passwords */
+/* $ModDep: m_sha256.h */
+
+#include "inspircd_config.h"
+#ifdef HAS_STDINT
+#include <stdint.h>
+#endif
+#include "users.h"
+#include "channels.h"
+#include "modules.h"
+#include "inspircd.h"
+
+#include "m_sha256.h"
+
+#ifndef HAS_STDINT
+typedef unsigned int uint32_t;
+#endif
+
+/** An sha 256 context, used by m_opersha256
+ */
+class SHA256Context : public classbase
+{
+ public:
+	unsigned int tot_len;
+	unsigned int len;
+	unsigned char block[2 * SHA256_BLOCK_SIZE];
+	uint32_t h[8];
+};
+
+#define SHFR(x, n)    (x >> n)
+#define ROTR(x, n)   ((x >> n) | (x << ((sizeof(x) << 3) - n)))
+#define ROTL(x, n)   ((x << n) | (x >> ((sizeof(x) << 3) - n)))
+#define CH(x, y, z)  ((x & y) ^ (~x & z))
+#define MAJ(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
+
+#define SHA256_F1(x) (ROTR(x,  2) ^ ROTR(x, 13) ^ ROTR(x, 22))
+#define SHA256_F2(x) (ROTR(x,  6) ^ ROTR(x, 11) ^ ROTR(x, 25))
+#define SHA256_F3(x) (ROTR(x,  7) ^ ROTR(x, 18) ^ SHFR(x,  3))
+#define SHA256_F4(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHFR(x, 10))
+
+#define UNPACK32(x, str)		       \
+{					      \
+	*((str) + 3) = (uint8_t) ((x)      );      \
+	*((str) + 2) = (uint8_t) ((x) >>  8);      \
+	*((str) + 1) = (uint8_t) ((x) >> 16);      \
+	*((str) + 0) = (uint8_t) ((x) >> 24);      \
+}
+
+#define PACK32(str, x)			 \
+{					      \
+	*(x) = ((uint32_t) *((str) + 3)      )     \
+	| ((uint32_t) *((str) + 2) <<  8)     \
+	| ((uint32_t) *((str) + 1) << 16)     \
+	| ((uint32_t) *((str) + 0) << 24);    \
+}
+
+/* Macros used for loops unrolling */
+
+#define SHA256_SCR(i)			  \
+{					      \
+	w[i] =  SHA256_F4(w[i - 2]) + w[i - 7]     \
+	+ SHA256_F3(w[i - 15]) + w[i - 16];  \
+}
+
+const unsigned int sha256_h0[8] =
+{
+	0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
+	0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
+};
+
+uint32_t sha256_k[64] =
+{
+	0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
+	0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
+	0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
+	0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
+	0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
+	0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
+	0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
+	0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
+	0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
+	0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
+	0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
+	0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
+	0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
+	0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
+	0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
+	0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
+};
+
+class ModuleSHA256 : public Module
+{
+	void SHA256Init(struct SHA256Context *ctx, const unsigned int* key)
+	{
+		if (key)
+		{
+			for (int i = 0; i < 8; i++)
+				ctx->h[i] = key[i];
+		}
+		else
+		{
+			for (int i = 0; i < 8; i++)
+				ctx->h[i] = sha256_h0[i];
+		}
+		ctx->len = 0;
+		ctx->tot_len = 0;
+	}
+
+	void SHA256Transform(struct SHA256Context *ctx, unsigned char *message, unsigned int block_nb)
+	{
+		uint32_t w[64];
+		uint32_t wv[8];
+		unsigned char *sub_block;
+		for (unsigned int i = 1; i <= block_nb; i++)
+		{
+			int j;
+			sub_block = message + ((i - 1) << 6);
+	
+			for (j = 0; j < 16; j++)
+				PACK32(&sub_block[j << 2], &w[j]);
+			for (j = 16; j < 64; j++)
+				SHA256_SCR(j);
+			for (j = 0; j < 8; j++)
+				wv[j] = ctx->h[j];
+			for (j = 0; j < 64; j++)
+			{
+				uint32_t t1 = wv[7] + SHA256_F2(wv[4]) + CH(wv[4], wv[5], wv[6]) + sha256_k[j] + w[j];
+				uint32_t t2 = SHA256_F1(wv[0]) + MAJ(wv[0], wv[1], wv[2]);
+				wv[7] = wv[6];
+				wv[6] = wv[5];
+				wv[5] = wv[4];
+				wv[4] = wv[3] + t1;
+				wv[3] = wv[2];
+				wv[2] = wv[1];
+				wv[1] = wv[0];
+				wv[0] = t1 + t2;
+			}
+			for (j = 0; j < 8; j++)
+				ctx->h[j] += wv[j];
+		}
+	}
+	
+	void SHA256Update(struct SHA256Context *ctx, unsigned char *message, unsigned int len)
+	{
+		unsigned int rem_len = SHA256_BLOCK_SIZE - ctx->len;
+		memcpy(&ctx->block[ctx->len], message, rem_len);
+		if (ctx->len + len < SHA256_BLOCK_SIZE)
+		{
+			ctx->len += len;
+			return;
+		}
+		unsigned int new_len = len - rem_len;
+		unsigned int block_nb = new_len / SHA256_BLOCK_SIZE;
+		unsigned char *shifted_message = message + rem_len;
+		SHA256Transform(ctx, ctx->block, 1);
+		SHA256Transform(ctx, shifted_message, block_nb);
+		rem_len = new_len % SHA256_BLOCK_SIZE;
+		memcpy(ctx->block, &shifted_message[block_nb << 6],rem_len);
+		ctx->len = rem_len;
+		ctx->tot_len += (block_nb + 1) << 6;
+	}
+	
+	void SHA256Final(struct SHA256Context *ctx, unsigned char *digest)
+	{
+		unsigned int block_nb = (1 + ((SHA256_BLOCK_SIZE - 9) < (ctx->len % SHA256_BLOCK_SIZE)));
+		unsigned int len_b = (ctx->tot_len + ctx->len) << 3;
+		unsigned int pm_len = block_nb << 6;
+		memset(ctx->block + ctx->len, 0, pm_len - ctx->len);
+		ctx->block[ctx->len] = 0x80;
+		UNPACK32(len_b, ctx->block + pm_len - 4);
+		SHA256Transform(ctx, ctx->block, block_nb);
+		for (int i = 0 ; i < 8; i++)
+			UNPACK32(ctx->h[i], &digest[i << 2]);
+	}
+	
+	void SHA256(const char *src, char *dest, int len, const char* hxc, const unsigned int* key = NULL)
+	{
+		// Generate the hash
+		unsigned char bytehash[SHA256_DIGEST_SIZE];
+		struct SHA256Context ctx;
+		SHA256Init(&ctx, key);
+		SHA256Update(&ctx, (unsigned char *)src, (unsigned int)len);
+		SHA256Final(&ctx, bytehash);
+		// Convert it to hex
+		for (int i = 0, j = 0; i < SHA256_DIGEST_SIZE; i++)
+		{
+			dest[j++] = hxc[bytehash[i] / 16];
+			dest[j++] = hxc[bytehash[i] % 16];
+			dest[j] = '\0';
+		}
+	}
+
+	unsigned int* key;
+	char* chars;
+
+ public:
+
+	ModuleSHA256(InspIRCd* Me) : Module::Module(Me), key(NULL), chars(NULL)
+	{
+	}
+
+	virtual ~ModuleSHA256()
+	{
+	}
+
+	void Implements(char *List)
+	{
+		List[I_OnRequest] = 1;
+	}
+
+	virtual char* OnRequest(Request* request)
+	{
+		SHA256Request* SHA = (SHA256Request*)request;
+		if (strcmp("SHA256_KEY", request->GetId()) == 0)
+		{
+			this->key = (unsigned int*)SHA->GetKeyData();
+		}
+		else if (strcmp("SHA256_HEX", request->GetId()) == 0)
+		{
+			this->chars = (char*)SHA->GetOutputs();
+		}
+		else if (strcmp("SHA256_SUM", request->GetId()) == 0)
+		{
+			static char data[MAXBUF];
+			SHA256((const char*)SHA->GetHashData(), data, strlen(SHA->GetHashData()), chars ? chars : "0123456789abcdef", key);
+			return data;
+		}
+		else if (strcmp("SHA256_RESET", request->GetId()) == 0)
+		{
+			this->chars = NULL;
+			this->key = NULL;
+		}
+		return NULL;
+	}
+
+	virtual Version GetVersion()
+	{
+		return Version(1, 1, 0, 1, VF_VENDOR, API_VERSION);
+	}
+};
+
+
+class ModuleSHA256Factory : public ModuleFactory
+{
+public:
+	ModuleSHA256Factory()
+	{
+	}
+
+	~ModuleSHA256Factory()
+	{
+	}
+
+	virtual Module *CreateModule(InspIRCd* Me)
+	{
+		return new ModuleSHA256(Me);
+	}
+
+};
+
+extern "C" void * init_module( void )
+{
+	return new ModuleSHA256Factory;
+}