/*
  *
  * Modified for Anope.
  * (C) 2006-2022 Anope Team
  * Contact us at team@anope.org
 
 SHA-1 in C
 By Steve Reid <steve@edmweb.com>
 100% Public Domain
 
 Test Vectors (from FIPS PUB 180-1)
 "abc"
   A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
 "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
   84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
 A million repetitions of "a"
   34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
 */
 
 /* #define LITTLE_ENDIAN * This should be #define'd if true. */
 
 #include "module.h"
 #include "modules/encryption.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 */
 inline static uint32_t blk0(CHAR64LONG16 &block, uint32_t i)
 {
 #ifdef LITTLE_ENDIAN
 	return block.l[i] = (rol(block.l[i], 24) & 0xFF00FF00) | (rol(block.l[i], 8) & 0x00FF00FF);
 #else
 	return block.l[i];
 #endif
 }
 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 : public Encryption::Context
 {
 	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 context->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 context.state[] */
 		this->state[0] += a;
 		this->state[1] += b;
 		this->state[2] += c;
 		this->state[3] += d;
 		this->state[4] += e;
 		/* Wipe variables */
 		a = b = c = d = e = 0;
 	}
 
  public:
 	SHA1Context(Encryption::IV *iv = NULL)
 	{
 		if (iv != NULL)
 		{
 			if (iv->second != 5)
 				throw CoreException("Invalid IV size");
 			for (int i = 0; i < 5; ++i)
 				this->state[i] = iv->first[i];
 		}
 		else
 			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) anope_override
 	{
 		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() anope_override
 	{
 		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);
 
 		/* Wipe variables */
 		memset(this->buffer, 0, sizeof(this->buffer));
 		memset(this->state, 0, sizeof(this->state));
 		memset(this->count, 0, sizeof(this->count));
 		memset(&finalcount, 0, sizeof(finalcount));
 
 		this->Transform(this->buffer);
 	}
 
 	Encryption::Hash GetFinalizedHash() anope_override
 	{
 		Encryption::Hash hash;
 		hash.first = this->digest;
 		hash.second = sizeof(this->digest);
 		return hash;
 	}
 };
 
 class SHA1Provider : public Encryption::Provider
 {
  public:
 	SHA1Provider(Module *creator) : Encryption::Provider(creator, "sha1") { }
 
 	Encryption::Context *CreateContext(Encryption::IV *iv) anope_override
 	{
 		return new SHA1Context(iv);
 	}
 
 	Encryption::IV GetDefaultIV() anope_override
 	{
 		Encryption::IV iv;
 		iv.first = sha1_iv;
 		iv.second = sizeof(sha1_iv) / sizeof(uint32_t);
 		return iv;
 	}
 };
 
 class ESHA1 : public Module
 {
 	SHA1Provider sha1provider;
 
  public:
 	ESHA1(const Anope::string &modname, const Anope::string &creator) : Module(modname, creator, ENCRYPTION | VENDOR),
 		sha1provider(this)
 	{
 
 	}
 
 	EventReturn OnEncrypt(const Anope::string &src, Anope::string &dest) anope_override
 	{
 		SHA1Context context;
 
 		context.Update(reinterpret_cast<const unsigned char *>(src.c_str()), src.length());
 		context.Finalize();
 
 		Encryption::Hash hash = context.GetFinalizedHash();
 
 		Anope::string buf = "sha1:" + Anope::Hex(reinterpret_cast<const char *>(hash.first), hash.second);
 
 		Log(LOG_DEBUG_2) << "(enc_sha1) hashed password from [" << src << "] to [" << buf << "]";
 		dest = buf;
 		return EVENT_ALLOW;
 	}
 
 	void OnCheckAuthentication(User *, IdentifyRequest *req) anope_override
 	{
 		const NickAlias *na = NickAlias::Find(req->GetAccount());
 		if (na == NULL)
 			return;
 		NickCore *nc = na->nc;
 
 		size_t pos = nc->pass.find(':');
 		if (pos == Anope::string::npos)
 			return;
 		Anope::string hash_method(nc->pass.begin(), nc->pass.begin() + pos);
 		if (!hash_method.equals_cs("sha1"))
 			return;
 
 		Anope::string buf;
 		this->OnEncrypt(req->GetPassword(), buf);
 		if (nc->pass.equals_cs(buf))
 		{
 			if (ModuleManager::FindFirstOf(ENCRYPTION) != this)
 				Anope::Encrypt(req->GetPassword(), nc->pass);
 			req->Success(this);
 		}
 	}
 };
 
 MODULE_INIT(ESHA1)

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