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/*
*
* Modified for Anope.
* (C) 2006-2024 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 final
: public Encryption::Context
{
uint32_t state[5];
uint32_t count[2];
unsigned char buffer[64];
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()
{
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));
}
void Update(const unsigned char *data, size_t len) 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);
}
Anope::string Finalize() 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() */
unsigned char digest[20];
memset(digest, 0, sizeof(digest));
for (i = 0; i < 20; ++i)
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);
return Anope::string(reinterpret_cast<const char *>(&digest), sizeof(digest));
}
};
class ESHA1 final
: public Module
{
private:
Encryption::SimpleProvider<SHA1Context> sha1provider;
public:
ESHA1(const Anope::string &modname, const Anope::string &creator)
: Module(modname, creator, ENCRYPTION | VENDOR)
, sha1provider(this, "sha1", 20, 64)
{
if (ModuleManager::FindFirstOf(ENCRYPTION) == this)
throw ModuleException("enc_sha1 is deprecated and can not be used as a primary encryption method");
sha1provider.Check({
{ "da39a3ee5e6b4b0d3255bfef95601890afd80709", "" },
{ "2fd4e1c67a2d28fced849ee1bb76e7391b93eb12", "The quick brown fox jumps over the lazy dog" },
});
}
void OnCheckAuthentication(User *, IdentifyRequest *req) override
{
const auto *na = NickAlias::Find(req->GetAccount());
if (!na)
return;
NickCore *nc = na->nc;
auto 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;
auto enc = "sha1:" + Anope::Hex(sha1provider.Encrypt(req->GetPassword()));
if (nc->pass.equals_cs(enc))
{
// If we are NOT the first encryption module we want to re-encrypt
// the password with the primary encryption method.
if (ModuleManager::FindFirstOf(ENCRYPTION) != this)
Anope::Encrypt(req->GetPassword(), nc->pass);
req->Success(this);
}
}
};
MODULE_INIT(ESHA1)
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