/*
 * Copyright (C) 2003-2007  Justin Karneges <justin@affinix.com>
 * Copyright (C) 2004,2005  Brad Hards <bradh@frogmouth.net>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301  USA
 *
 */

#include "qca_core.h"

#include "qca_cert.h"
#include "qca_textfilter.h"
#include "qcaprovider.h"
#include <QMutex>

#ifndef QCA_NO_SYSTEMSTORE
#include "qca_systemstore.h"
#endif

#include <cstdlib>

#define FRIENDLY_NAMES

namespace QCA {

class DefaultShared
{
private:
    mutable QMutex m;
    bool           _use_system;
    QString        _roots_file;
    QStringList    _skip_plugins;
    QStringList    _plugin_priorities;

public:
    DefaultShared()
        : _use_system(true)
    {
    }

    bool use_system() const
    {
        QMutexLocker locker(&m);
        return _use_system;
    }

    QString roots_file() const
    {
        QMutexLocker locker(&m);
        return _roots_file;
    }

    QStringList skip_plugins() const
    {
        QMutexLocker locker(&m);
        return _skip_plugins;
    }

    QStringList plugin_priorities() const
    {
        QMutexLocker locker(&m);
        return _plugin_priorities;
    }

    void set(bool               use_system,
             const QString     &roots_file,
             const QStringList &skip_plugins,
             const QStringList &plugin_priorities)
    {
        QMutexLocker locker(&m);
        _use_system        = use_system;
        _roots_file        = roots_file;
        _skip_plugins      = skip_plugins;
        _plugin_priorities = plugin_priorities;
    }
};

//----------------------------------------------------------------------------
// DefaultRandomContext
//----------------------------------------------------------------------------
class DefaultRandomContext : public RandomContext
{
    Q_OBJECT
public:
    DefaultRandomContext(Provider *p)
        : RandomContext(p)
    {
    }

    Provider::Context *clone() const override
    {
        return new DefaultRandomContext(provider());
    }

    SecureArray nextBytes(int size) override
    {
        SecureArray buf(size);
        for (int n = 0; n < (int)buf.size(); ++n)
            buf[n] = (char)std::rand();
        return buf;
    }
};

//----------------------------------------------------------------------------
// DefaultMD5Context
//----------------------------------------------------------------------------

/* NOTE: the following code was modified to not need BYTE_ORDER -- Justin */

/*
  Copyright (C) 1999, 2000, 2002 Aladdin Enterprises.  All rights reserved.

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.

  L. Peter Deutsch
  ghost@aladdin.com

 */
/* $Id$ */
/*
  Independent implementation of MD5 (RFC 1321).

  This code implements the MD5 Algorithm defined in RFC 1321, whose
  text is available at
    http://www.ietf.org/rfc/rfc1321.txt
  The code is derived from the text of the RFC, including the test suite
  (section A.5) but excluding the rest of Appendix A.  It does not include
  any code or documentation that is identified in the RFC as being
  copyrighted.

  The original and principal author of md5.c is L. Peter Deutsch
  <ghost@aladdin.com>.  Other authors are noted in the change history
  that follows (in reverse chronological order):

  2002-04-13 lpd Clarified derivation from RFC 1321; now handles byte order
    either statically or dynamically; added missing #include <string.h>
    in library.
  2002-03-11 lpd Corrected argument list for main(), and added int return
    type, in test program and T value program.
  2002-02-21 lpd Added missing #include <stdio.h> in test program.
  2000-07-03 lpd Patched to eliminate warnings about "constant is
    unsigned in ANSI C, signed in traditional"; made test program
    self-checking.
  1999-11-04 lpd Edited comments slightly for automatic TOC extraction.
  1999-10-18 lpd Fixed typo in header comment (ansi2knr rather than md5).
  1999-05-03 lpd Original version.
 */

/*
 * This package supports both compile-time and run-time determination of CPU
 * byte order.  If ARCH_IS_BIG_ENDIAN is defined as 0, the code will be
 * compiled to run only on little-endian CPUs; if ARCH_IS_BIG_ENDIAN is
 * defined as non-zero, the code will be compiled to run only on big-endian
 * CPUs; if ARCH_IS_BIG_ENDIAN is not defined, the code will be compiled to
 * run on either big- or little-endian CPUs, but will run slightly less
 * efficiently on either one than if ARCH_IS_BIG_ENDIAN is defined.
 */

typedef quint8  md5_byte_t; /* 8-bit byte */
typedef quint32 md5_word_t; /* 32-bit word */

/* Define the state of the MD5 Algorithm. */
struct md5_state_t
{
    md5_word_t count[2]; // 2   /* message length in bits, lsw first */
    md5_word_t abcd[4];  // 4   /* digest buffer */
    md5_byte_t buf[64];  // 64  /* accumulate block */

    md5_state_t()
    {
        memset(count, 0, sizeof(count));
        memset(abcd, 0, sizeof(abcd));
        memset(buf, 0, sizeof(buf));
    }
};

/* Initialize the algorithm. */
void md5_init(md5_state_t *pms);

/* Append a string to the message. */
void md5_append(md5_state_t *pms, const md5_byte_t *data, int nbytes);

/* Finish the message and return the digest. */
void md5_finish(md5_state_t *pms, md5_byte_t digest[16]);

#define T_MASK ((md5_word_t)~0)
#define T1 /* 0xd76aa478 */ (T_MASK ^ 0x28955b87)
#define T2 /* 0xe8c7b756 */ (T_MASK ^ 0x173848a9)
#define T3 0x242070db
#define T4 /* 0xc1bdceee */ (T_MASK ^ 0x3e423111)
#define T5 /* 0xf57c0faf */ (T_MASK ^ 0x0a83f050)
#define T6 0x4787c62a
#define T7 /* 0xa8304613 */ (T_MASK ^ 0x57cfb9ec)
#define T8 /* 0xfd469501 */ (T_MASK ^ 0x02b96afe)
#define T9 0x698098d8
#define T10 /* 0x8b44f7af */ (T_MASK ^ 0x74bb0850)
#define T11 /* 0xffff5bb1 */ (T_MASK ^ 0x0000a44e)
#define T12 /* 0x895cd7be */ (T_MASK ^ 0x76a32841)
#define T13 0x6b901122
#define T14 /* 0xfd987193 */ (T_MASK ^ 0x02678e6c)
#define T15 /* 0xa679438e */ (T_MASK ^ 0x5986bc71)
#define T16 0x49b40821
#define T17 /* 0xf61e2562 */ (T_MASK ^ 0x09e1da9d)
#define T18 /* 0xc040b340 */ (T_MASK ^ 0x3fbf4cbf)
#define T19 0x265e5a51
#define T20 /* 0xe9b6c7aa */ (T_MASK ^ 0x16493855)
#define T21 /* 0xd62f105d */ (T_MASK ^ 0x29d0efa2)
#define T22 0x02441453
#define T23 /* 0xd8a1e681 */ (T_MASK ^ 0x275e197e)
#define T24 /* 0xe7d3fbc8 */ (T_MASK ^ 0x182c0437)
#define T25 0x21e1cde6
#define T26 /* 0xc33707d6 */ (T_MASK ^ 0x3cc8f829)
#define T27 /* 0xf4d50d87 */ (T_MASK ^ 0x0b2af278)
#define T28 0x455a14ed
#define T29 /* 0xa9e3e905 */ (T_MASK ^ 0x561c16fa)
#define T30 /* 0xfcefa3f8 */ (T_MASK ^ 0x03105c07)
#define T31 0x676f02d9
#define T32 /* 0x8d2a4c8a */ (T_MASK ^ 0x72d5b375)
#define T33 /* 0xfffa3942 */ (T_MASK ^ 0x0005c6bd)
#define T34 /* 0x8771f681 */ (T_MASK ^ 0x788e097e)
#define T35 0x6d9d6122
#define T36 /* 0xfde5380c */ (T_MASK ^ 0x021ac7f3)
#define T37 /* 0xa4beea44 */ (T_MASK ^ 0x5b4115bb)
#define T38 0x4bdecfa9
#define T39 /* 0xf6bb4b60 */ (T_MASK ^ 0x0944b49f)
#define T40 /* 0xbebfbc70 */ (T_MASK ^ 0x4140438f)
#define T41 0x289b7ec6
#define T42 /* 0xeaa127fa */ (T_MASK ^ 0x155ed805)
#define T43 /* 0xd4ef3085 */ (T_MASK ^ 0x2b10cf7a)
#define T44 0x04881d05
#define T45 /* 0xd9d4d039 */ (T_MASK ^ 0x262b2fc6)
#define T46 /* 0xe6db99e5 */ (T_MASK ^ 0x1924661a)
#define T47 0x1fa27cf8
#define T48 /* 0xc4ac5665 */ (T_MASK ^ 0x3b53a99a)
#define T49 /* 0xf4292244 */ (T_MASK ^ 0x0bd6ddbb)
#define T50 0x432aff97
#define T51 /* 0xab9423a7 */ (T_MASK ^ 0x546bdc58)
#define T52 /* 0xfc93a039 */ (T_MASK ^ 0x036c5fc6)
#define T53 0x655b59c3
#define T54 /* 0x8f0ccc92 */ (T_MASK ^ 0x70f3336d)
#define T55 /* 0xffeff47d */ (T_MASK ^ 0x00100b82)
#define T56 /* 0x85845dd1 */ (T_MASK ^ 0x7a7ba22e)
#define T57 0x6fa87e4f
#define T58 /* 0xfe2ce6e0 */ (T_MASK ^ 0x01d3191f)
#define T59 /* 0xa3014314 */ (T_MASK ^ 0x5cfebceb)
#define T60 0x4e0811a1
#define T61 /* 0xf7537e82 */ (T_MASK ^ 0x08ac817d)
#define T62 /* 0xbd3af235 */ (T_MASK ^ 0x42c50dca)
#define T63 0x2ad7d2bb
#define T64 /* 0xeb86d391 */ (T_MASK ^ 0x14792c6e)

static void md5_process(md5_state_t *pms, const md5_byte_t *data /*[64]*/)
{
    md5_word_t a = pms->abcd[0], b = pms->abcd[1], c = pms->abcd[2], d = pms->abcd[3];
    md5_word_t t;

    /* Define storage for little-endian or both types of CPUs. */
    md5_word_t        xbuf[16];
    const md5_word_t *X;

    {
        if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
            /*
             * On big-endian machines, we must arrange the bytes in the
             * right order.
             */
            const md5_byte_t *xp = data;
            int               i;

            X = xbuf; /* (dynamic only) */

            for (i = 0; i < 16; ++i, xp += 4)
                xbuf[i] = xp[0] + (xp[1] << 8) + (xp[2] << 16) + (xp[3] << 24);
        } else /* dynamic big-endian */
        {
            /*
             * On little-endian machines, we can process properly aligned
             * data without copying it. On arm do copying always
             */
#ifndef Q_PROCESSOR_ARM
            if (!(reinterpret_cast<uintptr_t>(data) & 3)) {
                /* data are properly aligned */
                X = reinterpret_cast<const md5_word_t *>(data);
            } else
#endif
            {
                /* not aligned */
                memcpy(xbuf, data, 64);
                X = xbuf;
            }
        }
    }

#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32 - (n))))

    /* Round 1. */
    /* Let [abcd k s i] denote the operation
       a = b + ((a + F(b,c,d) + X[k] + T[i]) <<< s). */
#define F(x, y, z) (((x) & (y)) | (~(x) & (z)))
#define SET(a, b, c, d, k, s, Ti)                                                                                      \
    t = a + F(b, c, d) + X[k] + Ti;                                                                                    \
    a = ROTATE_LEFT(t, s) + b
    /* Do the following 16 operations. */
    SET(a, b, c, d, 0, 7, T1);
    SET(d, a, b, c, 1, 12, T2);
    SET(c, d, a, b, 2, 17, T3);
    SET(b, c, d, a, 3, 22, T4);
    SET(a, b, c, d, 4, 7, T5);
    SET(d, a, b, c, 5, 12, T6);
    SET(c, d, a, b, 6, 17, T7);
    SET(b, c, d, a, 7, 22, T8);
    SET(a, b, c, d, 8, 7, T9);
    SET(d, a, b, c, 9, 12, T10);
    SET(c, d, a, b, 10, 17, T11);
    SET(b, c, d, a, 11, 22, T12);
    SET(a, b, c, d, 12, 7, T13);
    SET(d, a, b, c, 13, 12, T14);
    SET(c, d, a, b, 14, 17, T15);
    SET(b, c, d, a, 15, 22, T16);
#undef SET

    /* Round 2. */
    /* Let [abcd k s i] denote the operation
         a = b + ((a + G(b,c,d) + X[k] + T[i]) <<< s). */
#define G(x, y, z) (((x) & (z)) | ((y) & ~(z)))
#define SET(a, b, c, d, k, s, Ti)                                                                                      \
    t = a + G(b, c, d) + X[k] + Ti;                                                                                    \
    a = ROTATE_LEFT(t, s) + b
    /* Do the following 16 operations. */
    SET(a, b, c, d, 1, 5, T17);
    SET(d, a, b, c, 6, 9, T18);
    SET(c, d, a, b, 11, 14, T19);
    SET(b, c, d, a, 0, 20, T20);
    SET(a, b, c, d, 5, 5, T21);
    SET(d, a, b, c, 10, 9, T22);
    SET(c, d, a, b, 15, 14, T23);
    SET(b, c, d, a, 4, 20, T24);
    SET(a, b, c, d, 9, 5, T25);
    SET(d, a, b, c, 14, 9, T26);
    SET(c, d, a, b, 3, 14, T27);
    SET(b, c, d, a, 8, 20, T28);
    SET(a, b, c, d, 13, 5, T29);
    SET(d, a, b, c, 2, 9, T30);
    SET(c, d, a, b, 7, 14, T31);
    SET(b, c, d, a, 12, 20, T32);
#undef SET

    /* Round 3. */
    /* Let [abcd k s t] denote the operation
         a = b + ((a + H(b,c,d) + X[k] + T[i]) <<< s). */
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define SET(a, b, c, d, k, s, Ti)                                                                                      \
    t = a + H(b, c, d) + X[k] + Ti;                                                                                    \
    a = ROTATE_LEFT(t, s) + b
    /* Do the following 16 operations. */
    SET(a, b, c, d, 5, 4, T33);
    SET(d, a, b, c, 8, 11, T34);
    SET(c, d, a, b, 11, 16, T35);
    SET(b, c, d, a, 14, 23, T36);
    SET(a, b, c, d, 1, 4, T37);
    SET(d, a, b, c, 4, 11, T38);
    SET(c, d, a, b, 7, 16, T39);
    SET(b, c, d, a, 10, 23, T40);
    SET(a, b, c, d, 13, 4, T41);
    SET(d, a, b, c, 0, 11, T42);
    SET(c, d, a, b, 3, 16, T43);
    SET(b, c, d, a, 6, 23, T44);
    SET(a, b, c, d, 9, 4, T45);
    SET(d, a, b, c, 12, 11, T46);
    SET(c, d, a, b, 15, 16, T47);
    SET(b, c, d, a, 2, 23, T48);
#undef SET

    /* Round 4. */
    /* Let [abcd k s t] denote the operation
         a = b + ((a + I(b,c,d) + X[k] + T[i]) <<< s). */
#define I(x, y, z) ((y) ^ ((x) | ~(z)))
#define SET(a, b, c, d, k, s, Ti)                                                                                      \
    t = a + I(b, c, d) + X[k] + Ti;                                                                                    \
    a = ROTATE_LEFT(t, s) + b
    /* Do the following 16 operations. */
    SET(a, b, c, d, 0, 6, T49);
    SET(d, a, b, c, 7, 10, T50);
    SET(c, d, a, b, 14, 15, T51);
    SET(b, c, d, a, 5, 21, T52);
    SET(a, b, c, d, 12, 6, T53);
    SET(d, a, b, c, 3, 10, T54);
    SET(c, d, a, b, 10, 15, T55);
    SET(b, c, d, a, 1, 21, T56);
    SET(a, b, c, d, 8, 6, T57);
    SET(d, a, b, c, 15, 10, T58);
    SET(c, d, a, b, 6, 15, T59);
    SET(b, c, d, a, 13, 21, T60);
    SET(a, b, c, d, 4, 6, T61);
    SET(d, a, b, c, 11, 10, T62);
    SET(c, d, a, b, 2, 15, T63);
    SET(b, c, d, a, 9, 21, T64);
#undef SET

    /* Then perform the following additions. (That is increment each
       of the four registers by the value it had before this block
       was started.) */
    pms->abcd[0] += a;
    pms->abcd[1] += b;
    pms->abcd[2] += c;
    pms->abcd[3] += d;
}

void md5_init(md5_state_t *pms)
{
    pms->count[0] = pms->count[1] = 0;
    pms->abcd[0]                  = 0x67452301;
    pms->abcd[1]                  = /*0xefcdab89*/ T_MASK ^ 0x10325476;
    pms->abcd[2]                  = /*0x98badcfe*/ T_MASK ^ 0x67452301;
    pms->abcd[3]                  = 0x10325476;
}

void md5_append(md5_state_t *pms, const md5_byte_t *data, int nbytes)
{
    const md5_byte_t *p      = data;
    int               left   = nbytes;
    int               offset = (pms->count[0] >> 3) & 63;
    md5_word_t        nbits  = (md5_word_t)(nbytes << 3);

    if (nbytes <= 0)
        return;

    /* Update the message length. */
    pms->count[1] += nbytes >> 29;
    pms->count[0] += nbits;
    if (pms->count[0] < nbits)
        pms->count[1]++;

    /* Process an initial partial block. */
    if (offset) {
        int copy = (offset + nbytes > 64 ? 64 - offset : nbytes);

        memcpy(pms->buf + offset, p, copy);
        if (offset + copy < 64)
            return;
        p += copy;
        left -= copy;
        md5_process(pms, pms->buf);
    }

    /* Process full blocks. */
    for (; left >= 64; p += 64, left -= 64)
        md5_process(pms, p);

    /* Process a final partial block. */
    if (left)
        memcpy(pms->buf, p, left);
}

void md5_finish(md5_state_t *pms, md5_byte_t digest[16])
{
    static const md5_byte_t pad[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};
    md5_byte_t              data[8];
    int                     i;

    /* Save the length before padding. */
    for (i = 0; i < 8; ++i)
        data[i] = (md5_byte_t)(pms->count[i >> 2] >> ((i & 3) << 3));
    /* Pad to 56 bytes mod 64. */
    md5_append(pms, pad, ((55 - (pms->count[0] >> 3)) & 63) + 1);
    /* Append the length. */
    md5_append(pms, data, 8);
    for (i = 0; i < 16; ++i)
        digest[i] = (md5_byte_t)(pms->abcd[i >> 2] >> ((i & 3) << 3));
}

class DefaultMD5Context : public HashContext
{
    Q_OBJECT
public:
    DefaultMD5Context(Provider *p)
        : HashContext(p, QStringLiteral("md5"))
    {
        clear();
    }

    Provider::Context *clone() const override
    {
        return new DefaultMD5Context(*this);
    }

    void clear() override
    {
        secure = true;
        md5_init(&md5);
    }

    void update(const MemoryRegion &in) override
    {
        if (!in.isSecure())
            secure = false;
        md5_append(&md5, (const md5_byte_t *)in.data(), in.size());
    }

    MemoryRegion final() override
    {
        if (secure) {
            SecureArray b(16, 0);
            md5_finish(&md5, (md5_byte_t *)b.data());
            return b;
        } else {
            QByteArray b(16, 0);
            md5_finish(&md5, (md5_byte_t *)b.data());
            return b;
        }
    }

    bool        secure;
    md5_state_t md5;
};

//----------------------------------------------------------------------------
// DefaultSHA1Context
//----------------------------------------------------------------------------

// SHA1 - from a public domain implementation by Steve Reid (steve@edmweb.com)

#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))

#ifdef Q_PROCESSOR_ARM
#define blk(i)                                                                                                         \
    (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))
#else
#define blk(i)                                                                                                         \
    (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))
#endif

/* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
#define R0(v, w, x, y, z, i)                                                                                           \
    z += ((w & (x ^ y)) ^ y) + blk0(i) + 0x5A827999 + rol(v, 5);                                                       \
    w = rol(w, 30);
#define R1(v, w, x, y, z, i)                                                                                           \
    z += ((w & (x ^ y)) ^ y) + blk(i) + 0x5A827999 + rol(v, 5);                                                        \
    w = rol(w, 30);
#define R2(v, w, x, y, z, i)                                                                                           \
    z += (w ^ x ^ y) + blk(i) + 0x6ED9EBA1 + rol(v, 5);                                                                \
    w = rol(w, 30);
#define R3(v, w, x, y, z, i)                                                                                           \
    z += (((w | x) & y) | (w & x)) + blk(i) + 0x8F1BBCDC + rol(v, 5);                                                  \
    w = rol(w, 30);
#define R4(v, w, x, y, z, i)                                                                                           \
    z += (w ^ x ^ y) + blk(i) + 0xCA62C1D6 + rol(v, 5);                                                                \
    w = rol(w, 30);

struct SHA1_CONTEXT
{
    quint32       state[5];   // 5
    quint32       count[2];   // 2
    unsigned char buffer[64]; // 64

    SHA1_CONTEXT()
    {
        memset(state, 0, sizeof(state));
        memset(count, 0, sizeof(count));
        memset(buffer, 0, sizeof(buffer));
    }
};

typedef union {
    unsigned char c[64];
    quint32       l[16];
} CHAR64LONG16;

class DefaultSHA1Context : public HashContext
{
    Q_OBJECT
public:
    SHA1_CONTEXT _context;
#ifdef Q_PROCESSOR_ARM
    CHAR64LONG16 block;
#else
    CHAR64LONG16 *block;
#endif
    bool secure;

    DefaultSHA1Context(Provider *p)
        : HashContext(p, QStringLiteral("sha1"))
    {
        clear();
    }

    Provider::Context *clone() const override
    {
        return new DefaultSHA1Context(*this);
    }

    void clear() override
    {
        secure = true;
        sha1_init(&_context);
    }

    void update(const MemoryRegion &in) override
    {
        if (!in.isSecure())
            secure = false;
        sha1_update(&_context, (unsigned char *)in.data(), (unsigned int)in.size());
    }

    MemoryRegion final() override
    {
        if (secure) {
            SecureArray b(20, 0);
            sha1_final((unsigned char *)b.data(), &_context);
            return b;
        } else {
            QByteArray b(20, 0);
            sha1_final((unsigned char *)b.data(), &_context);
            return b;
        }
    }

    inline unsigned long blk0(quint32 i)
    {
        if (QSysInfo::ByteOrder == QSysInfo::BigEndian)
#ifdef Q_PROCESSOR_ARM
            return block.l[i];
#else
            return block->l[i];
#endif
        else
#ifdef Q_PROCESSOR_ARM
            return (block.l[i] = (rol(block.l[i], 24) & 0xFF00FF00) | (rol(block.l[i], 8) & 0x00FF00FF));
#else
            return (block->l[i] = (rol(block->l[i], 24) & 0xFF00FF00) | (rol(block->l[i], 8) & 0x00FF00FF));
#endif
    }

    // Hash a single 512-bit block. This is the core of the algorithm.
    void transform(quint32 state[5], unsigned char buffer[64])
    {
        quint32 a, b, c, d, e;

#ifdef Q_PROCESSOR_ARM
        memcpy(&block, buffer, sizeof(block));
#else
        block = reinterpret_cast<CHAR64LONG16 *>(buffer);
#endif
        // Copy context->state[] to working vars
        a = state[0];
        b = state[1];
        c = state[2];
        d = state[3];
        e = state[4];

        // 4 rounds of 20 operations each. Loop unrolled.
        R0(a, b, c, d, e, 0);
        R0(e, a, b, c, d, 1);
        R0(d, e, a, b, c, 2);
        R0(c, d, e, a, b, 3);
        R0(b, c, d, e, a, 4);
        R0(a, b, c, d, e, 5);
        R0(e, a, b, c, d, 6);
        R0(d, e, a, b, c, 7);
        R0(c, d, e, a, b, 8);
        R0(b, c, d, e, a, 9);
        R0(a, b, c, d, e, 10);
        R0(e, a, b, c, d, 11);
        R0(d, e, a, b, c, 12);
        R0(c, d, e, a, b, 13);
        R0(b, c, d, e, a, 14);
        R0(a, b, c, d, e, 15);
        R1(e, a, b, c, d, 16);
        R1(d, e, a, b, c, 17);
        R1(c, d, e, a, b, 18);
        R1(b, c, d, e, a, 19);
        R2(a, b, c, d, e, 20);
        R2(e, a, b, c, d, 21);
        R2(d, e, a, b, c, 22);
        R2(c, d, e, a, b, 23);
        R2(b, c, d, e, a, 24);
        R2(a, b, c, d, e, 25);
        R2(e, a, b, c, d, 26);
        R2(d, e, a, b, c, 27);
        R2(c, d, e, a, b, 28);
        R2(b, c, d, e, a, 29);
        R2(a, b, c, d, e, 30);
        R2(e, a, b, c, d, 31);
        R2(d, e, a, b, c, 32);
        R2(c, d, e, a, b, 33);
        R2(b, c, d, e, a, 34);
        R2(a, b, c, d, e, 35);
        R2(e, a, b, c, d, 36);
        R2(d, e, a, b, c, 37);
        R2(c, d, e, a, b, 38);
        R2(b, c, d, e, a, 39);
        R3(a, b, c, d, e, 40);
        R3(e, a, b, c, d, 41);
        R3(d, e, a, b, c, 42);
        R3(c, d, e, a, b, 43);
        R3(b, c, d, e, a, 44);
        R3(a, b, c, d, e, 45);
        R3(e, a, b, c, d, 46);
        R3(d, e, a, b, c, 47);
        R3(c, d, e, a, b, 48);
        R3(b, c, d, e, a, 49);
        R3(a, b, c, d, e, 50);
        R3(e, a, b, c, d, 51);
        R3(d, e, a, b, c, 52);
        R3(c, d, e, a, b, 53);
        R3(b, c, d, e, a, 54);
        R3(a, b, c, d, e, 55);
        R3(e, a, b, c, d, 56);
        R3(d, e, a, b, c, 57);
        R3(c, d, e, a, b, 58);
        R3(b, c, d, e, a, 59);
        R4(a, b, c, d, e, 60);
        R4(e, a, b, c, d, 61);
        R4(d, e, a, b, c, 62);
        R4(c, d, e, a, b, 63);
        R4(b, c, d, e, a, 64);
        R4(a, b, c, d, e, 65);
        R4(e, a, b, c, d, 66);
        R4(d, e, a, b, c, 67);
        R4(c, d, e, a, b, 68);
        R4(b, c, d, e, a, 69);
        R4(a, b, c, d, e, 70);
        R4(e, a, b, c, d, 71);
        R4(d, e, a, b, c, 72);
        R4(c, d, e, a, b, 73);
        R4(b, c, d, e, a, 74);
        R4(a, b, c, d, e, 75);
        R4(e, a, b, c, d, 76);
        R4(d, e, a, b, c, 77);
        R4(c, d, e, a, b, 78);
        R4(b, c, d, e, a, 79);

        // Add the working vars back into context.state[]
        state[0] += a;
        state[1] += b;
        state[2] += c;
        state[3] += d;
        state[4] += e;

        // Wipe variables
        a = b = c = d = e = 0;
    }

    // SHA1Init - Initialize new context
    void sha1_init(SHA1_CONTEXT *context)
    {
        // SHA1 initialization constants
        context->state[0] = 0x67452301;
        context->state[1] = 0xEFCDAB89;
        context->state[2] = 0x98BADCFE;
        context->state[3] = 0x10325476;
        context->state[4] = 0xC3D2E1F0;
        context->count[0] = context->count[1] = 0;
    }

    // Run your data through this
    void sha1_update(SHA1_CONTEXT *context, unsigned char *data, quint32 len)
    {
        quint32 i, j;

        j = (context->count[0] >> 3) & 63;
        if ((context->count[0] += len << 3) < (len << 3))
            context->count[1]++;

        context->count[1] += (len >> 29);

        if ((j + len) > 63) {
            memcpy(&context->buffer[j], data, (i = 64 - j));
            transform(context->state, context->buffer);
            for (; i + 63 < len; i += 64) {
                transform(context->state, &data[i]);
            }
            j = 0;
        } else
            i = 0;
        memcpy(&context->buffer[j], &data[i], len - i);
    }

    // Add padding and return the message digest
    void sha1_final(unsigned char digest[20], SHA1_CONTEXT *context)
    {
        quint32       i;
        unsigned char finalcount[8];

        for (i = 0; i < 8; i++) {
            finalcount[i] =
                (unsigned char)((context->count[(i >= 4 ? 0 : 1)] >> ((3 - (i & 3)) * 8)) & 255); // Endian independent
        }
        sha1_update(context, (unsigned char *)"\200", 1);
        while ((context->count[0] & 504) != 448) {
            sha1_update(context, (unsigned char *)"\0", 1);
        }
        sha1_update(context, finalcount, 8); // Should cause a transform()
        for (i = 0; i < 20; i++) {
            digest[i] = (unsigned char)((context->state[i >> 2] >> ((3 - (i & 3)) * 8)) & 255);
        }

        // Wipe variables
        i = 0;
        memset(context->buffer, 0, 64);
        memset(context->state, 0, 20);
        memset(context->count, 0, 8);
        memset(&finalcount, 0, 8);
    }
};

//----------------------------------------------------------------------------
// DefaultKeyStoreEntry
//----------------------------------------------------------------------------

// this escapes colons, commas, and newlines.  colons and commas so that they
//   are available as delimiters, and newlines so that our output can be a
//   single line of text.
static QString escape_string(const QString &in)
{
    QString out;
    for (const QChar &c : in) {
        if (c == QLatin1Char('\\'))
            out += QLatin1String("\\\\");
        else if (c == QLatin1Char(':'))
            out += QLatin1String("\\c");
        else if (c == QLatin1Char(','))
            out += QLatin1String("\\o");
        else if (c == QLatin1Char('\n'))
            out += QLatin1String("\\n");
        else
            out += c;
    }
    return out;
}

static bool unescape_string(const QString &in, QString *_out)
{
    QString out;
    for (int n = 0; n < in.length(); ++n) {
        if (in[n] == QLatin1Char('\\')) {
            if (n + 1 >= in.length())
                return false;

            if (in[n + 1] == QLatin1Char('\\'))
                out += QLatin1Char('\\');
            else if (in[n + 1] == QLatin1Char('c'))
                out += QLatin1Char(':');
            else if (in[n + 1] == QLatin1Char('o'))
                out += QLatin1Char(',');
            else if (in[n + 1] == QLatin1Char('n'))
                out += QLatin1Char('\n');
            else
                return false;
            ++n;
        } else
            out += in[n];
    }
    *_out = out;
    return true;
}

static QString escape_stringlist(const QStringList &in)
{
    QStringList list;
    for (int n = 0; n < in.count(); ++n)
        list += escape_string(in[n]);
    return list.join(QStringLiteral(":"));
}

static bool unescape_stringlist(const QString &in, QStringList *_out)
{
    QStringList       out;
    const QStringList list = in.split(QLatin1Char(':'));
    for (int n = 0; n < list.count(); ++n) {
        QString str;
        if (!unescape_string(list[n], &str))
            return false;
        out += str;
    }
    *_out = out;
    return true;
}

// serialization format is a colon separated list of 7 escaped strings
//  0 - "qca_def_1" (header)
//  1 - store id
//  2 - store name
//  3 - entry id
//  4 - entry name
//  5 - entry type (e.g. "cert")
//  6 - string encoding of object (e.g. DER encoded in Base64)
static QString entry_serialize(const QString &storeId,
                               const QString &storeName,
                               const QString &entryId,
                               const QString &entryName,
                               const QString &entryType,
                               const QString &data)
{
    QStringList out;
    out += QStringLiteral("qca_def");
    out += storeId;
    out += storeName;
    out += entryId;
    out += entryName;
    out += entryType;
    out += data;
    return escape_stringlist(out);
}

static bool entry_deserialize(const QString &in,
                              QString       *storeId,
                              QString       *storeName,
                              QString       *entryId,
                              QString       *entryName,
                              QString       *entryType,
                              QString       *data)
{
    QStringList list;
    if (!unescape_stringlist(in, &list))
        return false;
    if (list.count() != 7)
        return false;
    if (list[0] != QLatin1String("qca_def"))
        return false;
    *storeId   = list[1];
    *storeName = list[2];
    *entryId   = list[3];
    *entryName = list[4];
    *entryType = list[5];
    *data      = list[6];
    return true;
}

class DefaultKeyStoreEntry : public KeyStoreEntryContext
{
    Q_OBJECT
public:
    KeyStoreEntry::Type _type;
    QString             _id, _name, _storeId, _storeName;
    Certificate         _cert;
    CRL                 _crl;
    mutable QString     _serialized;

    DefaultKeyStoreEntry(const Certificate &cert, const QString &storeId, const QString &storeName, Provider *p)
        : KeyStoreEntryContext(p)
    {
        _type      = KeyStoreEntry::TypeCertificate;
        _storeId   = storeId;
        _storeName = storeName;
        _cert      = cert;
    }

    DefaultKeyStoreEntry(const CRL &crl, const QString &storeId, const QString &storeName, Provider *p)
        : KeyStoreEntryContext(p)
    {
        _type      = KeyStoreEntry::TypeCRL;
        _storeId   = storeId;
        _storeName = storeName;
        _crl       = crl;
    }

    Provider::Context *clone() const override
    {
        return new DefaultKeyStoreEntry(*this);
    }

    KeyStoreEntry::Type type() const override
    {
        return _type;
    }

    QString id() const override
    {
        return _id;
    }

    QString name() const override
    {
        return _name;
    }

    QString storeId() const override
    {
        return _storeId;
    }

    QString storeName() const override
    {
        return _storeName;
    }

    Certificate certificate() const override
    {
        return _cert;
    }

    CRL crl() const override
    {
        return _crl;
    }

    QString serialize() const override
    {
        if (_serialized.isEmpty()) {
            QString typestr;
            QString datastr;

            if (_type == KeyStoreEntry::TypeCertificate) {
                typestr = QStringLiteral("cert");
                datastr = Base64().arrayToString(_cert.toDER());
            } else {
                typestr = QStringLiteral("crl");
                datastr = Base64().arrayToString(_crl.toDER());
            }

            _serialized = entry_serialize(_storeId, _storeName, _id, _name, typestr, datastr);
        }

        return _serialized;
    }

    static DefaultKeyStoreEntry *deserialize(const QString &in, Provider *provider)
    {
        QString storeId, storeName, id, name, typestr, datastr;

        if (entry_deserialize(in, &storeId, &storeName, &id, &name, &typestr, &datastr)) {
            const QByteArray      data = Base64().stringToArray(datastr).toByteArray();
            DefaultKeyStoreEntry *c;

            if (typestr == QLatin1String("cert")) {
                Certificate cert = Certificate::fromDER(data);
                if (cert.isNull())
                    return nullptr;
                c = new DefaultKeyStoreEntry(cert, storeId, storeName, provider);
            } else if (typestr == QLatin1String("crl")) {
                CRL crl = CRL::fromDER(data);
                if (crl.isNull())
                    return nullptr;
                c = new DefaultKeyStoreEntry(crl, storeId, storeName, provider);
            } else
                return nullptr;

            c->_id         = id;
            c->_name       = name;
            c->_serialized = in;
            return c;
        }
        return nullptr;
    }

    QString simpleId() const
    {
        if (_type == KeyStoreEntry::TypeCertificate)
            return QString::number(qHash(_cert.toDER()));
        else
            return QString::number(qHash(_crl.toDER()));
    }

    QString simpleName() const
    {
        // use the common name, else orgname
        if (_type == KeyStoreEntry::TypeCertificate) {
            QString str = _cert.commonName();
            if (str.isEmpty())
                str = _cert.subjectInfo().value(Organization);
            return str;
        } else
            return _crl.issuerInfo().value(CommonName);
    }
};

//----------------------------------------------------------------------------
// DefaultKeyStoreList
//----------------------------------------------------------------------------
class DefaultKeyStoreList : public KeyStoreListContext
{
    Q_OBJECT
public:
    bool           x509_supported;
    DefaultShared *shared;

    DefaultKeyStoreList(Provider *p, DefaultShared *_shared)
        : KeyStoreListContext(p)
        , shared(_shared)
    {
    }

    ~DefaultKeyStoreList() override
    {
    }

    Provider::Context *clone() const override
    {
        return nullptr;
    }

    void start() override
    {
        x509_supported = false;

        QMetaObject::invokeMethod(this, "busyEnd", Qt::QueuedConnection);
    }

    QList<int> keyStores() override
    {
        if (!x509_supported) {
            if (isSupported("cert") && isSupported("crl"))
                x509_supported = true;
        }

        bool have_systemstore = false;
#ifndef QCA_NO_SYSTEMSTORE
        if (shared->use_system())
            have_systemstore = qca_have_systemstore();
#endif

        QList<int> list;

        // system store only shows up if the OS store is available or
        //   there is a configured store file
        if (x509_supported && (have_systemstore || !shared->roots_file().isEmpty()))
            list += 0;

        return list;
    }

    KeyStore::Type type(int) const override
    {
        return KeyStore::System;
    }

    QString storeId(int) const override
    {
        return QStringLiteral("qca-default-systemstore");
    }

    QString name(int) const override
    {
        return QStringLiteral("System Trusted Certificates");
    }

    QList<KeyStoreEntry::Type> entryTypes(int) const override
    {
        QList<KeyStoreEntry::Type> list;
        list += KeyStoreEntry::TypeCertificate;
        list += KeyStoreEntry::TypeCRL;
        return list;
    }

    QList<KeyStoreEntryContext *> entryList(int) override
    {
        QList<KeyStoreEntryContext *> out;

        QList<Certificate> certs;
        QList<CRL>         crls;

        if (shared->use_system()) {
            CertificateCollection col;
#ifndef QCA_NO_SYSTEMSTORE
            col = qca_get_systemstore(QString());
#endif
            certs += col.certificates();
            crls += col.crls();
        }

        const QString roots = shared->roots_file();
        if (!roots.isEmpty()) {
            CertificateCollection col = CertificateCollection::fromFlatTextFile(roots);
            certs += col.certificates();
            crls += col.crls();
        }

#ifdef FRIENDLY_NAMES
        const QStringList names = makeFriendlyNames(certs);
#endif
        for (int n = 0; n < certs.count(); ++n) {
            DefaultKeyStoreEntry *c = new DefaultKeyStoreEntry(certs[n], storeId(0), name(0), provider());
            c->_id                  = c->simpleId();
#ifdef FRIENDLY_NAMES
            c->_name = names[n];
#else
            c->_name = c->simpleName();
#endif
            out.append(c);
        }

        for (int n = 0; n < crls.count(); ++n) {
            DefaultKeyStoreEntry *c = new DefaultKeyStoreEntry(crls[n], storeId(0), name(0), provider());
            c->_id                  = c->simpleId();
            c->_name                = c->simpleName();
            out.append(c);
        }

        return out;
    }

    KeyStoreEntryContext *entryPassive(const QString &serialized) override
    {
        return DefaultKeyStoreEntry::deserialize(serialized, provider());
    }
};

//----------------------------------------------------------------------------
// DefaultProvider
//----------------------------------------------------------------------------
static bool unescape_config_stringlist(const QString &in, QStringList *_out)
{
    QStringList       out;
    const QStringList list = in.split(QLatin1Char(','));
    for (int n = 0; n < list.count(); ++n) {
        QString str;
        if (!unescape_string(list[n], &str))
            return false;
        out += str.trimmed();
    }
    *_out = out;
    return true;
}

class DefaultProvider : public Provider
{
public:
    DefaultShared shared;

    void init() override
    {
        const QDateTime now = QDateTime::currentDateTime();

        uint t = now.toSecsSinceEpoch();
        if (now.time().msec() > 0)
            t /= now.time().msec();
        std::srand(t);
    }

    int version() const override
    {
        return QCA_VERSION;
    }

    int qcaVersion() const override
    {
        return QCA_VERSION;
    }

    QString name() const override
    {
        return QStringLiteral("default");
    }

    QStringList features() const override
    {
        QStringList list;
        list += QStringLiteral("random");
        list += QStringLiteral("md5");
        list += QStringLiteral("sha1");
        list += QStringLiteral("keystorelist");
        return list;
    }

    Provider::Context *createContext(const QString &type) override
    {
        if (type == QLatin1String("random"))
            return new DefaultRandomContext(this);
        else if (type == QLatin1String("md5"))
            return new DefaultMD5Context(this);
        else if (type == QLatin1String("sha1"))
            return new DefaultSHA1Context(this);
        else if (type == QLatin1String("keystorelist"))
            return new DefaultKeyStoreList(this, &shared);
        else
            return nullptr;
    }

    QVariantMap defaultConfig() const override
    {
        QVariantMap config;
        config[QStringLiteral("formtype")]          = QStringLiteral("http://affinix.com/qca/forms/default#1.0");
        config[QStringLiteral("use_system")]        = true;
        config[QStringLiteral("roots_file")]        = QString();
        config[QStringLiteral("skip_plugins")]      = QString();
        config[QStringLiteral("plugin_priorities")] = QString();
        return config;
    }

    void configChanged(const QVariantMap &config) override
    {
        const bool    use_system            = config[QStringLiteral("use_system")].toBool();
        const QString roots_file            = config[QStringLiteral("roots_file")].toString();
        const QString skip_plugins_str      = config[QStringLiteral("skip_plugins")].toString();
        const QString plugin_priorities_str = config[QStringLiteral("plugin_priorities")].toString();

        QStringList tmp;

        QStringList skip_plugins;
        if (unescape_config_stringlist(skip_plugins_str, &tmp))
            skip_plugins = tmp;

        QStringList plugin_priorities;
        if (unescape_config_stringlist(plugin_priorities_str, &tmp))
            plugin_priorities = tmp;

        for (int n = 0; n < plugin_priorities.count(); ++n) {
            QString &s = plugin_priorities[n];

            // make sure the entry ends with ":number"
            int  x  = s.indexOf(QLatin1Char(':'));
            bool ok = false;
            if (x != -1)
#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 2)
                (void)QStringView(s).mid(x + 1).toInt(&ok);
#else
                s.midRef(x + 1).toInt(&ok);
#endif
            if (!ok) {
                plugin_priorities.removeAt(n);
                --n;
            }
        }

        shared.set(use_system, roots_file, skip_plugins, plugin_priorities);
    }
};

Provider *create_default_provider()
{
    return new DefaultProvider;
}

QStringList skip_plugins(Provider *defaultProvider)
{
    DefaultProvider *that = (DefaultProvider *)defaultProvider;
    return that->shared.skip_plugins();
}

QStringList plugin_priorities(Provider *defaultProvider)
{
    DefaultProvider *that = (DefaultProvider *)defaultProvider;
    return that->shared.plugin_priorities();
}

}

#include "qca_default.moc"
