{**
 *
 * This file is part of the RenegadeBBS project.
 *
 * sikofitt <sikofitt@gmail.com>
 *
 * For the full copyright and license information,
 * pleave view the LICENSE file that was distributed
 * with this source code.
 *
 *}
unit BCrypt;
{$mode objfpc}{$H+}
{$codepage utf8}

interface

uses
  SysUtils,
  Classes;

const
  // bcrypt uses 128-bit (16-byte) salt
  BCRYPT_SALT_LEN = 16;
  BLOWFISH_NUM_ROUNDS = 16;
  BCRYPT_DEFAULT_COST = 12;

  PBoxOrg: array[0..17] of DWord = (
    $243f6a88, $85a308d3, $13198a2e, $03707344, $a4093822, $299f31d0, $082efa98,
    $ec4e6c89, $452821e6, $38d01377, $be5466cf, $34e90c6c, $c0ac29b7, $c97c50dd,
    $3f84d5b5, $b5470917, $9216d5d9, $8979fb1b
  );

  SBoxOrg: array[0..1023] of DWord = (
    $d1310ba6, $98dfb5ac, $2ffd72db, $d01adfb7, $b8e1afed, $6a267e96, $ba7c9045,
    $f12c7f99, $24a19947, $b3916cf7, $0801f2e2, $858efc16, $636920d8, $71574e69,
    $a458fea3, $f4933d7e, $0d95748f, $728eb658, $718bcd58, $82154aee, $7b54a41d,
    $c25a59b5, $9c30d539, $2af26013, $c5d1b023, $286085f0, $ca417918, $b8db38ef,
    $8e79dcb0, $603a180e, $6c9e0e8b, $b01e8a3e, $d71577c1, $bd314b27, $78af2fda,
    $55605c60, $e65525f3, $aa55ab94, $57489862, $63e81440, $55ca396a, $2aab10b6,
    $b4cc5c34, $1141e8ce, $a15486af, $7c72e993, $b3ee1411, $636fbc2a, $2ba9c55d,
    $741831f6, $ce5c3e16, $9b87931e, $afd6ba33, $6c24cf5c, $7a325381, $28958677,
    $3b8f4898, $6b4bb9af, $c4bfe81b, $66282193, $61d809cc, $fb21a991, $487cac60,
    $5dec8032, $ef845d5d, $e98575b1, $dc262302, $eb651b88, $23893e81, $d396acc5,
    $0f6d6ff3, $83f44239, $2e0b4482, $a4842004, $69c8f04a, $9e1f9b5e, $21c66842,
    $f6e96c9a, $670c9c61, $abd388f0, $6a51a0d2, $d8542f68, $960fa728, $ab5133a3,
    $6eef0b6c, $137a3be4, $ba3bf050, $7efb2a98, $a1f1651d, $39af0176, $66ca593e,
    $82430e88, $8cee8619, $456f9fb4, $7d84a5c3, $3b8b5ebe, $e06f75d8, $85c12073,
    $401a449f, $56c16aa6, $4ed3aa62, $363f7706, $1bfedf72, $429b023d, $37d0d724,
    $d00a1248, $db0fead3, $49f1c09b, $075372c9, $80991b7b, $25d479d8, $f6e8def7,
    $e3fe501a, $b6794c3b, $976ce0bd, $04c006ba, $c1a94fb6, $409f60c4, $5e5c9ec2,
    $196a2463, $68fb6faf, $3e6c53b5, $1339b2eb, $3b52ec6f, $6dfc511f, $9b30952c,
    $cc814544, $af5ebd09, $bee3d004, $de334afd, $660f2807, $192e4bb3, $c0cba857,
    $45c8740f, $d20b5f39, $b9d3fbdb, $5579c0bd, $1a60320a, $d6a100c6, $402c7279,
    $679f25fe, $fb1fa3cc, $8ea5e9f8, $db3222f8, $3c7516df, $fd616b15, $2f501ec8,
    $ad0552ab, $323db5fa, $fd238760, $53317b48, $3e00df82, $9e5c57bb, $ca6f8ca0,
    $1a87562e, $df1769db, $d542a8f6, $287effc3, $ac6732c6, $8c4f5573, $695b27b0,
    $bbca58c8, $e1ffa35d, $b8f011a0, $10fa3d98, $fd2183b8, $4afcb56c, $2dd1d35b,
    $9a53e479, $b6f84565, $d28e49bc, $4bfb9790, $e1ddf2da, $a4cb7e33, $62fb1341,
    $cee4c6e8, $ef20cada, $36774c01, $d07e9efe, $2bf11fb4, $95dbda4d, $ae909198,
    $eaad8e71, $6b93d5a0, $d08ed1d0, $afc725e0, $8e3c5b2f, $8e7594b7, $8ff6e2fb,
    $f2122b64, $8888b812, $900df01c, $4fad5ea0, $688fc31c, $d1cff191, $b3a8c1ad,
    $2f2f2218, $be0e1777, $ea752dfe, $8b021fa1, $e5a0cc0f, $b56f74e8, $18acf3d6,
    $ce89e299, $b4a84fe0, $fd13e0b7, $7cc43b81, $d2ada8d9, $165fa266, $80957705,
    $93cc7314, $211a1477, $e6ad2065, $77b5fa86, $c75442f5, $fb9d35cf, $ebcdaf0c,
    $7b3e89a0, $d6411bd3, $ae1e7e49, $00250e2d, $2071b35e, $226800bb, $57b8e0af,
    $2464369b, $f009b91e, $5563911d, $59dfa6aa, $78c14389, $d95a537f, $207d5ba2,
    $02e5b9c5, $83260376, $6295cfa9, $11c81968, $4e734a41, $b3472dca, $7b14a94a,
    $1b510052, $9a532915, $d60f573f, $bc9bc6e4, $2b60a476, $81e67400, $08ba6fb5,
    $571be91f, $f296ec6b, $2a0dd915, $b6636521, $e7b9f9b6, $ff34052e, $c5855664,
    $53b02d5d, $a99f8fa1, $08ba4799, $6e85076a, $4b7a70e9, $b5b32944, $db75092e,
    $c4192623, $ad6ea6b0, $49a7df7d, $9cee60b8, $8fedb266, $ecaa8c71, $699a17ff,
    $5664526c, $c2b19ee1, $193602a5, $75094c29, $a0591340, $e4183a3e, $3f54989a,
    $5b429d65, $6b8fe4d6, $99f73fd6, $a1d29c07, $efe830f5, $4d2d38e6, $f0255dc1,
    $4cdd2086, $8470eb26, $6382e9c6, $021ecc5e, $09686b3f, $3ebaefc9, $3c971814,
    $6b6a70a1, $687f3584, $52a0e286, $b79c5305, $aa500737, $3e07841c, $7fdeae5c,
    $8e7d44ec, $5716f2b8, $b03ada37, $f0500c0d, $f01c1f04, $0200b3ff, $ae0cf51a,
    $3cb574b2, $25837a58, $dc0921bd, $d19113f9, $7ca92ff6, $94324773, $22f54701,
    $3ae5e581, $37c2dadc, $c8b57634, $9af3dda7, $a9446146, $0fd0030e, $ecc8c73e,
    $a4751e41, $e238cd99, $3bea0e2f, $3280bba1, $183eb331, $4e548b38, $4f6db908,
    $6f420d03, $f60a04bf, $2cb81290, $24977c79, $5679b072, $bcaf89af, $de9a771f,
    $d9930810, $b38bae12, $dccf3f2e, $5512721f, $2e6b7124, $501adde6, $9f84cd87,
    $7a584718, $7408da17, $bc9f9abc, $e94b7d8c, $ec7aec3a, $db851dfa, $63094366,
    $c464c3d2, $ef1c1847, $3215d908, $dd433b37, $24c2ba16, $12a14d43, $2a65c451,
    $50940002, $133ae4dd, $71dff89e, $10314e55, $81ac77d6, $5f11199b, $043556f1,
    $d7a3c76b, $3c11183b, $5924a509, $f28fe6ed, $97f1fbfa, $9ebabf2c, $1e153c6e,
    $86e34570, $eae96fb1, $860e5e0a, $5a3e2ab3, $771fe71c, $4e3d06fa, $2965dcb9,
    $99e71d0f, $803e89d6, $5266c825, $2e4cc978, $9c10b36a, $c6150eba, $94e2ea78,
    $a5fc3c53, $1e0a2df4, $f2f74ea7, $361d2b3d, $1939260f, $19c27960, $5223a708,
    $f71312b6, $ebadfe6e, $eac31f66, $e3bc4595, $a67bc883, $b17f37d1, $018cff28,
    $c332ddef, $be6c5aa5, $65582185, $68ab9802, $eecea50f, $db2f953b, $2aef7dad,
    $5b6e2f84, $1521b628, $29076170, $ecdd4775, $619f1510, $13cca830, $eb61bd96,
    $0334fe1e, $aa0363cf, $b5735c90, $4c70a239, $d59e9e0b, $cbaade14, $eecc86bc,
    $60622ca7, $9cab5cab, $b2f3846e, $648b1eaf, $19bdf0ca, $a02369b9, $655abb50,
    $40685a32, $3c2ab4b3, $319ee9d5, $c021b8f7, $9b540b19, $875fa099, $95f7997e,
    $623d7da8, $f837889a, $97e32d77, $11ed935f, $16681281, $0e358829, $c7e61fd6,
    $96dedfa1, $7858ba99, $57f584a5, $1b227263, $9b83c3ff, $1ac24696, $cdb30aeb,
    $532e3054, $8fd948e4, $6dbc3128, $58ebf2ef, $34c6ffea, $fe28ed61, $ee7c3c73,
    $5d4a14d9, $e864b7e3, $42105d14, $203e13e0, $45eee2b6, $a3aaabea, $db6c4f15,
    $facb4fd0, $c742f442, $ef6abbb5, $654f3b1d, $41cd2105, $d81e799e, $86854dc7,
    $e44b476a, $3d816250, $cf62a1f2, $5b8d2646, $fc8883a0, $c1c7b6a3, $7f1524c3,
    $69cb7492, $47848a0b, $5692b285, $095bbf00, $ad19489d, $1462b174, $23820e00,
    $58428d2a, $0c55f5ea, $1dadf43e, $233f7061, $3372f092, $8d937e41, $d65fecf1,
    $6c223bdb, $7cde3759, $cbee7460, $4085f2a7, $ce77326e, $a6078084, $19f8509e,
    $e8efd855, $61d99735, $a969a7aa, $c50c06c2, $5a04abfc, $800bcadc, $9e447a2e,
    $c3453484, $fdd56705, $0e1e9ec9, $db73dbd3, $105588cd, $675fda79, $e3674340,
    $c5c43465, $713e38d8, $3d28f89e, $f16dff20, $153e21e7, $8fb03d4a, $e6e39f2b,
    $db83adf7, $e93d5a68, $948140f7, $f64c261c, $94692934, $411520f7, $7602d4f7,
    $bcf46b2e, $d4a20068, $d4082471, $3320f46a, $43b7d4b7, $500061af, $1e39f62e,
    $97244546, $14214f74, $bf8b8840, $4d95fc1d, $96b591af, $70f4ddd3, $66a02f45,
    $bfbc09ec, $03bd9785, $7fac6dd0, $31cb8504, $96eb27b3, $55fd3941, $da2547e6,
    $abca0a9a, $28507825, $530429f4, $0a2c86da, $e9b66dfb, $68dc1462, $d7486900,
    $680ec0a4, $27a18dee, $4f3ffea2, $e887ad8c, $b58ce006, $7af4d6b6, $aace1e7c,
    $d3375fec, $ce78a399, $406b2a42, $20fe9e35, $d9f385b9, $ee39d7ab, $3b124e8b,
    $1dc9faf7, $4b6d1856, $26a36631, $eae397b2, $3a6efa74, $dd5b4332, $6841e7f7,
    $ca7820fb, $fb0af54e, $d8feb397, $454056ac, $ba489527, $55533a3a, $20838d87,
    $fe6ba9b7, $d096954b, $55a867bc, $a1159a58, $cca92963, $99e1db33, $a62a4a56,
    $3f3125f9, $5ef47e1c, $9029317c, $fdf8e802, $04272f70, $80bb155c, $05282ce3,
    $95c11548, $e4c66d22, $48c1133f, $c70f86dc, $07f9c9ee, $41041f0f, $404779a4,
    $5d886e17, $325f51eb, $d59bc0d1, $f2bcc18f, $41113564, $257b7834, $602a9c60,
    $dff8e8a3, $1f636c1b, $0e12b4c2, $02e1329e, $af664fd1, $cad18115, $6b2395e0,
    $333e92e1, $3b240b62, $eebeb922, $85b2a20e, $e6ba0d99, $de720c8c, $2da2f728,
    $d0127845, $95b794fd, $647d0862, $e7ccf5f0, $5449a36f, $877d48fa, $c39dfd27,
    $f33e8d1e, $0a476341, $992eff74, $3a6f6eab, $f4f8fd37, $a812dc60, $a1ebddf8,
    $991be14c, $db6e6b0d, $c67b5510, $6d672c37, $2765d43b, $dcd0e804, $f1290dc7,
    $cc00ffa3, $b5390f92, $690fed0b, $667b9ffb, $cedb7d9c, $a091cf0b, $d9155ea3,
    $bb132f88, $515bad24, $7b9479bf, $763bd6eb, $37392eb3, $cc115979, $8026e297,
    $f42e312d, $6842ada7, $c66a2b3b, $12754ccc, $782ef11c, $6a124237, $b79251e7,
    $06a1bbe6, $4bfb6350, $1a6b1018, $11caedfa, $3d25bdd8, $e2e1c3c9, $44421659,
    $0a121386, $d90cec6e, $d5abea2a, $64af674e, $da86a85f, $bebfe988, $64e4c3fe,
    $9dbc8057, $f0f7c086, $60787bf8, $6003604d, $d1fd8346, $f6381fb0, $7745ae04,
    $d736fccc, $83426b33, $f01eab71, $b0804187, $3c005e5f, $77a057be, $bde8ae24,
    $55464299, $bf582e61, $4e58f48f, $f2ddfda2, $f474ef38, $8789bdc2, $5366f9c3,
    $c8b38e74, $b475f255, $46fcd9b9, $7aeb2661, $8b1ddf84, $846a0e79, $915f95e2,
    $466e598e, $20b45770, $8cd55591, $c902de4c, $b90bace1, $bb8205d0, $11a86248,
    $7574a99e, $b77f19b6, $e0a9dc09, $662d09a1, $c4324633, $e85a1f02, $09f0be8c,
    $4a99a025, $1d6efe10, $1ab93d1d, $0ba5a4df, $a186f20f, $2868f169, $dcb7da83,
    $573906fe, $a1e2ce9b, $4fcd7f52, $50115e01, $a70683fa, $a002b5c4, $0de6d027,
    $9af88c27, $773f8641, $c3604c06, $61a806b5, $f0177a28, $c0f586e0, $006058aa,
    $30dc7d62, $11e69ed7, $2338ea63, $53c2dd94, $c2c21634, $bbcbee56, $90bcb6de,
    $ebfc7da1, $ce591d76, $6f05e409, $4b7c0188, $39720a3d, $7c927c24, $86e3725f,
    $724d9db9, $1ac15bb4, $d39eb8fc, $ed545578, $08fca5b5, $d83d7cd3, $4dad0fc4,
    $1e50ef5e, $b161e6f8, $a28514d9, $6c51133c, $6fd5c7e7, $56e14ec4, $362abfce,
    $ddc6c837, $d79a3234, $92638212, $670efa8e, $406000e0, $3a39ce37, $d3faf5cf,
    $abc27737, $5ac52d1b, $5cb0679e, $4fa33742, $d3822740, $99bc9bbe, $d5118e9d,
    $bf0f7315, $d62d1c7e, $c700c47b, $b78c1b6b, $21a19045, $b26eb1be, $6a366eb4,
    $5748ab2f, $bc946e79, $c6a376d2, $6549c2c8, $530ff8ee, $468dde7d, $d5730a1d,
    $4cd04dc6, $2939bbdb, $a9ba4650, $ac9526e8, $be5ee304, $a1fad5f0, $6a2d519a,
    $63ef8ce2, $9a86ee22, $c089c2b8, $43242ef6, $a51e03aa, $9cf2d0a4, $83c061ba,
    $9be96a4d, $8fe51550, $ba645bd6, $2826a2f9, $a73a3ae1, $4ba99586, $ef5562e9,
    $c72fefd3, $f752f7da, $3f046f69, $77fa0a59, $80e4a915, $87b08601, $9b09e6ad,
    $3b3ee593, $e990fd5a, $9e34d797, $2cf0b7d9, $022b8b51, $96d5ac3a, $017da67d,
    $d1cf3ed6, $7c7d2d28, $1f9f25cf, $adf2b89b, $5ad6b472, $5a88f54c, $e029ac71,
    $e019a5e6, $47b0acfd, $ed93fa9b, $e8d3c48d, $283b57cc, $f8d56629, $79132e28,
    $785f0191, $ed756055, $f7960e44, $e3d35e8c, $15056dd4, $88f46dba, $03a16125,
    $0564f0bd, $c3eb9e15, $3c9057a2, $97271aec, $a93a072a, $1b3f6d9b, $1e6321f5,
    $f59c66fb, $26dcf319, $7533d928, $b155fdf5, $03563482, $8aba3cbb, $28517711,
    $c20ad9f8, $abcc5167, $ccad925f, $4de81751, $3830dc8e, $379d5862, $9320f991,
    $ea7a90c2, $fb3e7bce, $5121ce64, $774fbe32, $a8b6e37e, $c3293d46, $48de5369,
    $6413e680, $a2ae0810, $dd6db224, $69852dfd, $09072166, $b39a460a, $6445c0dd,
    $586cdecf, $1c20c8ae, $5bbef7dd, $1b588d40, $ccd2017f, $6bb4e3bb, $dda26a7e,
    $3a59ff45, $3e350a44, $bcb4cdd5, $72eacea8, $fa6484bb, $8d6612ae, $bf3c6f47,
    $d29be463, $542f5d9e, $aec2771b, $f64e6370, $740e0d8d, $e75b1357, $f8721671,
    $af537d5d, $4040cb08, $4eb4e2cc, $34d2466a, $0115af84, $e1b00428, $95983a1d,
    $06b89fb4, $ce6ea048, $6f3f3b82, $3520ab82, $011a1d4b, $277227f8, $611560b1,
    $e7933fdc, $bb3a792b, $344525bd, $a08839e1, $51ce794b, $2f32c9b7, $a01fbac9,
    $e01cc87e, $bcc7d1f6, $cf0111c3, $a1e8aac7, $1a908749, $d44fbd9a, $d0dadecb,
    $d50ada38, $0339c32a, $c6913667, $8df9317c, $e0b12b4f, $f79e59b7, $43f5bb3a,
    $f2d519ff, $27d9459c, $bf97222c, $15e6fc2a, $0f91fc71, $9b941525, $fae59361,
    $ceb69ceb, $c2a86459, $12baa8d1, $b6c1075e, $e3056a0c, $10d25065, $cb03a442,
    $e0ec6e0e, $1698db3b, $4c98a0be, $3278e964, $9f1f9532, $e0d392df, $d3a0342b,
    $8971f21e, $1b0a7441, $4ba3348c, $c5be7120, $c37632d8, $df359f8d, $9b992f2e,
    $e60b6f47, $0fe3f11d, $e54cda54, $1edad891, $ce6279cf, $cd3e7e6f, $1618b166,
    $fd2c1d05, $848fd2c5, $f6fb2299, $f523f357, $a6327623, $93a83531, $56cccd02,
    $acf08162, $5a75ebb5, $6e163697, $88d273cc, $de966292, $81b949d0, $4c50901b,
    $71c65614, $e6c6c7bd, $327a140a, $45e1d006, $c3f27b9a, $c9aa53fd, $62a80f00,
    $bb25bfe2, $35bdd2f6, $71126905, $b2040222, $b6cbcf7c, $cd769c2b, $53113ec0,
    $1640e3d3, $38abbd60, $2547adf0, $ba38209c, $f746ce76, $77afa1c5, $20756060,
    $85cbfe4e, $8ae88dd8, $7aaaf9b0, $4cf9aa7e, $1948c25c, $02fb8a8c, $01c36ae4,
    $d6ebe1f9, $90d4f869, $a65cdea0, $3f09252d, $c208e69f, $b74e6132, $ce77e25b,
    $578fdfe3, $3ac372e6
  );

  MagicText: array[0..5] of DWord = (
    $4f727068, $65616e42, $65686f6c, $64657253, $63727944, $6f756274
  );

  BsdBase64EncodeTable: array[0..63] of char =
    { 0:} './' +
    { 2:} 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' +
    {28:} 'abcdefghijklmnopqrstuvwxyz' +
    {54:} '0123456789';

  BsdBase64DecodeTable: array[#0..#127] of integer = (
    // ________________
    {  0:} -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    // ________________
    { 16:} -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    // ______________./
    { 32:} -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1,
    // 0123456789______
    { 48:} 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, -1, -1, -1, -1, -1, -1,
    // _ABCDEFGHIJKLMNO
    { 64:} -1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
    // PQRSTUVWXYZ_____
    { 80:} 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, -1, -1, -1, -1, -1,
    // _abcdefghijklmno
    { 96:} -1, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42,
    // pqrstuvwxyz_____
    {113:} 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, -1, -1, -1, -1, -1
  );

type
  THashTypes = (bcDefault, bcPHP, bcBSD, bcUnknown);
  RTPasswordInformation = Object
    Algo : THashTypes;
    Cost : Word;
    AlgoName,
    BCryptSalt,
    BCryptHash : AnsiString;
  end;

EHash = class(EArgumentException);

TBCryptHash = class(TObject)
private
  FSBox: array[0..1023] of DWord;
  FPBox: array[0..17] of DWord;
  function BsdBase64Encode(const RawByteData: TBytes; CharacterLength: Sizeint): AnsiString;
  function BsdBase64Decode(const EncodedString : AnsiString): TBytes;
  function Crypt(const Password, Salt : AnsiString; Cost : Byte; HashType : THashTypes) : AnsiString;
  function CryptRaw(const HashKey, Salt: TBytes; Cost : Byte): TBytes;
  procedure EKSKey(const Salt, HashKey: TBytes);
  procedure Encipher(var lr: array of DWord; const offset: SizeInt);
  function FormatPasswordHash(const Salt, Hash: TBytes; Cost : Byte; HashType : THashTypes): AnsiString;
  function getRandomBlockFileName : AnsiString;
  procedure InitializeKey();
  function isBSDAlphabet(CurrentCharacter : Char) : Boolean;
  function MakeSalt : TBytes;
  function MTRandomBytes(NumberOfBytes : SizeUInt) : AnsiString;
  procedure NKey(const HashKey: TBytes);
  function osHasRandomBlock : Boolean;
  function osHasURandomBlock : Boolean;
  function ResolveHashType(const HashType : AnsiString) : THashTypes;
  function StreamToWord(const RawByteData: TBytes; var offset: SizeInt): DWord;
  function UnixRandomBytes(NumberOfBytes : SizeUInt) : AnsiString;
public
  constructor Create; overload;
  destructor Destroy; override;
  function CreateHash(const Password : AnsiString) : AnsiString; overload;
  function CreateHash(const Password : AnsiString; HashType : THashTypes) : AnsiString; overload;
  function CreateHash(const Password : AnsiString; HashType : THashTypes; Cost : Byte) : AnsiString; overload;
  function VerifyHash(const Password, Hash : AnsiString) : Boolean;
  function NeedsRehash(const BCryptHash : AnsiString) : Boolean; overload;
  function NeedsRehash(const BCryptHash : AnsiString; Cost : Byte) : Boolean; overload;
  function HashGetInfo(const Hash : AnsiString) : RTPasswordInformation;
end;

implementation

Uses
  Math; // @Todo : Remove and use Renegade.Random

constructor TBCryptHash.Create;
   begin
     inherited Create;
   end;

destructor TBCryptHash.Destroy;
  begin
    inherited Destroy;
  end;

function TBCryptHash.BsdBase64Decode(const EncodedString : AnsiString): TBytes;

  function Char64(Character: AnsiChar): Sizeint;
    begin
      if Ord(Character) > Length(BsdBase64DecodeTable) then
        begin
          Result := -1;
        end
      else begin
        Result := BsdBase64DecodeTable[Character];
      end;
    end; { Char64 }

  procedure Append(Value: Byte);
  var
    i: SizeUint;
    begin
      i := Length(Result);
      SetLength(Result, i + 1);
      Result[i] := Value;
    end; { Append }

var
  i,
  EncodedStringLength,
  c1, c2, c3, c4: Sizeint;

begin
  SetLength(Result, 0);
  i := 1;
  EncodedStringLength := Length(EncodedString);
  while (i < EncodedStringLength) and (Length(Result) < BCRYPT_SALT_LEN) do
    begin
      c1 := Char64(EncodedString[i]);
      Inc(i);
      c2 := Char64(EncodedString[i]);
      Inc(i);
      if (c1 = -1) or (c2 = -1) then
        begin
            Exit;
        end;

      {
        Now we have at least one byte in c1|c2
        c1 = ..111111
        c2 = ..112222
      }
      Append((c1 shl 2) or ((c2 and $30) shr 4));
      //If there's a 3rd character, then we can use c2|c3 to form the second byte
      if (i > EncodedStringLength) or (Length(Result) >= BCRYPT_SALT_LEN) then
        begin
            Break;
        end;

      c3 := Char64(EncodedString[i]);
      Inc(i);
      if (c3 = -1) then
        begin
            Exit;
        end;

      {
        Now we have the next byte in c2|c3
        c2 = ..112222
        c3 = ..222233
      }
      Append(((c2 and $0f) shl 4) or ((c3 and $3c) shr 2));
      //If there's a 4th caracter, then we can use c3|c4 to form the third byte
      if (i > EncodedStringLength) or (Length(Result) >= BCRYPT_SALT_LEN) then
        begin
            Break;
        end;

      c4 := Char64(EncodedString[i]);
      Inc(i);
      if c4 = -1 then
        begin
            Exit;
        end;

      {
        Now we have the next byte in c3|c4
        c3 = ..222233
        c4 = ..333333
      }
      Append(((c3 and $03) shl 6) or c4);
    end; { While }
end; { TBCryptHash.BsdBase64Decode }

function TBCryptHash.BsdBase64Encode(const RawByteData: TBytes; CharacterLength: Sizeint): AnsiString;
var
  i,
  b1, b2: SizeInt;
begin
  Result := '';
  if (CharacterLength <= 0) or (CharacterLength > Length(RawByteData)) then
    begin
      Exit;
    end;

  i := 0;
  while i < CharacterLength do
    begin
      b1 := RawByteData[i] and $ff;
      Inc(i);

      Result := Result + BsdBase64EncodeTable[(b1 shr 2) and $3f];
      b1 := (b1 and $03) shl 4;
      if i >= CharacterLength then
        begin
          Result := Result + BsdBase64EncodeTable[b1 and $3f];
          Exit;
        end;

      b2 := RawByteData[i] and $ff;
      Inc(i);
      b1 := b1 or ((b2 shr 4) and $0f);

      Result := Result + BsdBase64EncodeTable[b1 and $3f];
      b1 := (b2 and $0f) shl 2;
      if i >= CharacterLength then
        begin
          Result := Result + BsdBase64EncodeTable[b1 and $3f];
          Exit;
        end;

      b2 := RawByteData[i] and $ff;
      Inc(i);
      b1 := b1 or ((b2 shr 6) and $03);
      Result := Result + BsdBase64EncodeTable[b1 and $3f];
      Result := Result + BsdBase64EncodeTable[b2 and $3f];
    end;
end; { TBCryptHash.BsdBase64Encode }

function TBCryptHash.CryptRaw(const HashKey, Salt: TBytes; Cost : Byte): TBytes;
var
  CryptData: array[0..5] of DWord;
  CryptLength: integer;
  BCryptRounds: DWord;
  i, j: SizeInt;
begin
  Move(MagicText[0], CryptData[0], Sizeof(MagicText));
  CryptLength := Length(CryptData);
  BCryptRounds := 1 shl Cost;
  InitializeKey();
  EKSKey(Salt, HashKey);

  for i := 1 to BCryptRounds do
    begin
      NKey(HashKey);
      NKey(Salt);
    end;

  for i := 1 to 64 do
    begin
      for j := 0 to (CryptLength shr 1) - 1 do
        begin
          Encipher(CryptData, j shl 1);
        end;
    end;

  SetLength(Result, CryptLength * 4);
  j := 0;
  for i := 0 to CryptLength - 1 do
    begin
      Result[j] := (CryptData[i] shr 24) and $FF;
      Inc(j);
      Result[j] := (CryptData[i] shr 16) and $FF;
      Inc(j);
      Result[j] := (CryptData[i] shr 8) and $FF;
      Inc(j);
      Result[j] := CryptData[i] and $FF;
      Inc(j);
    end;
end; { TBCryptHash.CryptRaw }

procedure TBCryptHash.EKSKey(const Salt, HashKey: TBytes);
var
  lr: array[0..1] of DWord;
  i, passwordOffset, saltOffset, PLen, SLen: SizeInt;
begin
  passwordOffset := 0;
  saltOffset := 0;
  PLen := Length(FPBox);
  SLen := Length(FSBox);
  lr[0] := 0;
  lr[1] := 0;

  for i := 0 to PLen - 1 do
  begin
    FPBox[i] := FPBox[i] xor StreamToWord(HashKey, passwordOffset);
  end;
  for i := 0 to (PLen div 2) - 1 do
  begin
    lr[0] := lr[0] xor StreamToWord(Salt, saltOffset);
    lr[1] := lr[1] xor StreamToWord(Salt, saltOffset);
    Encipher(lr, 0);
    FPBox[2 * i] := lr[0];
    FPBox[2 * i + 1] := lr[1];
  end;
  for i := 0 to (SLen div 2) - 1 do
  begin
    lr[0] := lr[0] xor StreamToWord(Salt, saltOffset);
    lr[1] := lr[1] xor StreamToWord(Salt, saltOffset);
    Encipher(lr, 0);
    FSBox[2 * i] := lr[0];
    FSBox[2 * i + 1] := lr[1];
  end;
end; { TBCryptHash.EKSKey }

{$OVERFLOWCHECKS OFF}
procedure TBCryptHash.Encipher(var lr: array of DWord; const offset: SizeInt);
var
  i, n, block, r: DWord;
begin
  block := lr[offset];
  r := lr[offset + 1];
  block := block xor FPBox[0];
  i := 1;
  while i <= BLOWFISH_NUM_ROUNDS - 1 do
  begin
    n := FSBox[(block shr 24) and $FF];
    n := n + FSBox[$100 or ((block shr 16) and $FF)];
    n := n xor FSBox[$200 or ((block shr 8) and $FF)];
    n := n + FSBox[$300 or (block and $FF)];
    r := r xor (n xor FPBox[i]);
    Inc(i);

    n := FSBox[(r shr 24) and $FF];
    n := n + FSBox[$100 or ((r shr 16) and $FF)];
    n := n xor FSBox[$200 or ((r shr 8) and $FF)];
    n := n + FSBox[$300 or (r and $FF)];
    block := block xor (n xor FPBox[i]);
    Inc(i);
  end;
  lr[offset] := r xor FPBox[BLOWFISH_NUM_ROUNDS + 1];
  lr[offset + 1] := block;
end;
{$OVERFLOWCHECKS ON}

function TBCryptHash.FormatPasswordHash(const Salt, Hash: TBytes; Cost : Byte; HashType : THashTypes): AnsiString;
var
  SaltString: ansistring;
  HashString: ansistring;
  HashPrefix : AnsiString;
begin
  case HashType of
  bcBSD : begin
    HashPrefix := '2a';
  end;
  bcPHP,bcDefault : begin
    HashPrefix := '2y';
  end;
 end;
  SaltString := BsdBase64Encode(Salt, Length(Salt));
  HashString := BsdBase64Encode(Hash, Length(MagicText) * 4 - 1);
  Result := Format('$%s$%d$%s%s', [HashPrefix, Cost, SaltString, HashString]);
end;

function TBCryptHash.getRandomBlockFileName : AnsiString;
var
  OSRandomBlockFileName : PAnsiString;
begin
  OSRandomBlockFileName := NewStr(Space(12));
  SetLength(OSRandomBlockFileName^, 12);
  if osHasURandomBlock then
    begin
      AssignStr(OSRandomBlockFileName, '/dev/urandom');
    end
  else if osHasRandomBlock then
    begin
      AssignStr(OSRandomBlockFileName,'/dev/random');
    end;
    Result := OSRandomBlockFileName^;
    DisposeStr(OSRandomBlockFileName);
end; { TBCryptHash.getRandomBlockFileName }

procedure TBCryptHash.InitializeKey();
begin
  Move(SBoxOrg, FSBox, Sizeof(FSBox));
  Move(PBoxOrg, FPBox, Sizeof(FPBox));
end; { TBCryptHash.InitializeKey }

function TBCryptHash.isBSDAlphabet(CurrentCharacter : Char) : Boolean;
begin
  Result := CurrentCharacter in ['.','/','a'..'z', 'A'..'Z', '0'..'9'];
end; { TBCryptHash.isBSDAlphabet }

function TBCryptHash.MTRandomBytes(NumberOfBytes : SizeUInt) : AnsiString;
var
  RandomByteString : AnsiString;
  Count : SizeUint;
  WorkingByte : sizeUInt;
begin
  Count := 1;
  WorkingByte := 0;
  SetLength(RandomByteString, (NumberOfBytes * 2) +1);

  Randomize;
  while Count <= (NumberOfBytes * 2) do
    begin
      { ???: Replace this with internal Windows CryptGenRandom function
         when I get ahold of a Windows machine. }
      WorkingByte := WorkingByte or RandomRange(1000000, Maxint) xor RandomRange(10000, Maxint);
      RandomByteString[Count] := Chr(WorkingByte mod 256);
      Inc(Count);
    end;
    SetLength(RandomByteString, NumberOfBytes);
    Result := RandomByteString;
end; { TBCryptHash.MTRandomBytes }

procedure TBCryptHash.NKey(const HashKey: TBytes);
var
  lr: array[0..1] of DWord;
  i, passwordOffset, PLen, SLen: SizeInt;
begin
  passwordOffset := 0;
  PLen := Length(FPBox);
  SLen := Length(FSBox);
  lr[0] := 0;
  lr[1] := 0;

  for i := 0 to PLen - 1 do
  begin
    FPBox[i] := FPBox[i] xor StreamToWord(HashKey, passwordOffset);
  end;
  for i := 0 to (PLen div 2) - 1 do
  begin
    Encipher(lr, 0);
    FPBox[2 * i] := lr[0];
    FPBox[2 * i + 1] := lr[1];
  end;
  for i := 0 to (SLen div 2) - 1 do
  begin
    Encipher(lr, 0);
    FSBox[2 * i] := lr[0];
    FSBox[2 * i + 1] := lr[1];
  end;
end; { TBCryptHash.NKey }

function TBCryptHash.osHasRandomBlock : Boolean;
begin
  osHasRandomBlock := FileExists('/dev/random');
end; { TBCryptHash.osHasRandomBlock }

function TBCryptHash.osHasURandomBlock : Boolean;
begin
   osHasURandomBlock := FileExists('/dev/urandom');
end; { TBCryptHash.osHasURandomBlock }

function TBCryptHash.MakeSalt : TBytes;
var
  ByteArray: TBytes;
  RandomTempString : AnsiString;
  i : SizeInt;
begin
SetLength(RandomTempString, 17);
SetLength(ByteArray, 16);
{$IFDEF UNIX}
  RandomTempString := UnixRandomBytes(BCRYPT_SALT_LEN);
{$ELSE}
  Randomize;
  RandomTempString := MTRandomBytes(BCRYPT_SALT_LEN);
{$ENDIF}
  i := 0;
  while i <= Length(RandomTempString) do
    begin
      ByteArray[i] := Ord(RandomTempString[i+1]);
      Inc(i);
    end;
    SetLength(ByteArray, 16);
    Result := ByteArray;
end;

function TBCryptHash.StreamToWord(const RawByteData: TBytes; var offset: SizeInt): DWord;
var
  i: SizeInt;
begin
  Result := 0;
  for i := 1 to 4 do
  begin
    Result := (Result shl 8) or (RawByteData[offset] and $FF);
    offset := (offset + 1) mod Length(RawByteData);
  end;
end; { TBCryptHash.StreamToWord }

function TBCryptHash.UnixRandomBytes(NumberOfBytes : SizeUInt) : AnsiString;
var
  OSRandomBlockFileName : AnsiString;
  RandomFileStream : TFileStream;
  RandomFileBuffer : AnsiString;
  FileBytesRead : SizeUInt;
begin
    SetLength(OSRandomBlockFileName, 13);
    OSRandomBlockFileName := getRandomBlockFileName;
    SetLength(RandomFileBuffer, (NumberOfBytes * 2));
  try
    RandomFileStream := TFileStream.Create(OSRandomBlockFileName, fmOpenRead);
    RandomFileStream.Position := 0;
    FileBytesRead := 1;

    while FileBytesRead <= (NumberOfBytes * 2) do
      begin
        RandomFileStream.Read(RandomFileBuffer[FileBytesRead], 1);
        Inc(FileBytesRead);
      end;
  except
    on E:Exception do
      writeln('File : ', OSRandomBlockFileName, ' could not be read or written because: ', E.Message);
    end;

  SetLength(RandomFileBuffer, NumberOfBytes);
  RandomFileStream.Free;
  Result := RandomFileBuffer;
end; { TBCryptHash.unixRandomBytes }

function TBCryptHash.CreateHash(const Password : AnsiString) : AnsiString; overload;
begin
  Result := CreateHash(Password, bcPHP, BCRYPT_DEFAULT_COST);
end;
function TBCryptHash.CreateHash(const Password : AnsiString; HashType : THashTypes) : AnsiString; overload;
begin
 Result := CreateHash(Password, HashType, BCRYPT_DEFAULT_COST);
end; { TBCryptHash.CreateHash }

function TBCryptHash.CreateHash(const Password : AnsiString; HashType : THashTypes; Cost : Byte) : AnsiString; overload;
var
  PasswordKey,
  SaltBytes,
  Hash : TBytes;
begin
 if (Cost < 10) or (Cost > 30) then
   begin
     raise Exception.Create('Invalid value for cost.  It must be between 10 and 30.');
   end;
 SetLength(PasswordKey, Length(Password) + 1);
 Move(Password[1], PasswordKey[0], Length(Password));
 PasswordKey[High(PasswordKey)] := 0;
 SaltBytes := MakeSalt;
 Hash := CryptRaw(PasswordKey, SaltBytes, Cost);
 Result := FormatPasswordHash(SaltBytes, Hash, Cost, HashType);
end; { TBCryptHash.CreateHash }

function TBCryptHash.Crypt(const Password, Salt : AnsiString; Cost : Byte; HashType : THashTypes) : AnsiString;
var
  PasswordKey,
  SaltBytes,
  Hash : TBytes;
begin
  SetLength(PasswordKey, Length(Password) +1);
  Move(Password[1], PasswordKey[0], Length(Password));
  PasswordKey[High(PasswordKey)] := 0;
  saltBytes := BsdBase64Decode(Salt);

  Hash := CryptRaw(PasswordKey, SaltBytes, Cost);
  Result := FormatPasswordHash(SaltBytes, Hash, Cost, HashType);
end;

function TBCryptHash.ResolveHashType(const HashType : AnsiString) : THashTypes;
begin
  case HashType of
    '$2y$': begin
      Result := (bcPHP);
    end;
    '$2a$': begin
      Result := (bcBSD);
    end;
  else
   begin
     Result := (bcUnknown);
   end;
  end;
end;

function TBCryptHash.VerifyHash(const Password, Hash : AnsiString) : Boolean;
var
  WorkingBcryptHash, Salt : AnsiString;
  HashCounter, ResultStatus, BCryptCost : Byte;
  HashType : THashTypes;
  PasswordInfo :RTPasswordInformation;
Begin
  ResultStatus := 0;
  try
    PasswordInfo := HashGetInfo(Hash);
  except
    on e: EHash do
      begin
        Result := False;
        Exit;
      end;
  end;
  with PasswordInfo do
    begin
        HashType := Algo;
        BCryptCost := Cost;
        Salt := BCryptSalt;
    end;
      WorkingBcryptHash := Crypt(Password, Salt, BCryptCost, HashType);
      if (Length(WorkingBcryptHash) < 60) or (Length(WorkingBcryptHash) > 60) then
        begin
          Result := False;
          Exit;
        end;
      if Length(Hash) <> Length(WorkingBcryptHash) then
        begin
          Result := False;
          Exit;
        end;
      for HashCounter := 1 to Length(Hash) do
      begin
      { From ext/standard/password.c php_password_verify line 244
        We're using this method instead of = in order to provide
        resistance towards timing attacks. This is a constant time
        equality check that will always check every byte of both
        values. }
        ResultStatus := ResultStatus or (ord(WorkingBcryptHash[HashCounter]) xor ord(Hash[HashCounter]));
      end;

      Result := (ResultStatus = 0);

end;

function TBCryptHash.NeedsRehash(const BCryptHash : AnsiString) : Boolean; overload;
begin
  Result := NeedsRehash(BCryptHash, BCRYPT_DEFAULT_COST);
end;

function TBCryptHash.NeedsRehash(const BCryptHash : AnsiString; Cost : Byte) : Boolean; overload;
var
  OldCost: Byte;
begin
  OldCost := StrToInt(Copy(BCryptHash, 5, 2));
  if OldCost <> Cost then
    begin
      Result := True;
    end else
    begin
      Result := False;
    end;
end;

function TBCryptHash.HashGetInfo(const Hash : AnsiString) : RTPasswordInformation;
var
  PasswordInfo : RTPasswordInformation;
  BCryptCost : Byte;
  BCryptHash,
  BCryptSalt : AnsiString;
  HashType : THashTypes;
begin
  if (Length(Hash) < 60) or (Length(Hash) > 60) then
    begin
      raise EHash.Create(Format(#10#13'Invalid hash %s'#10#13, [Hash]));
      Exit;
    end;
  HashType := ResolveHashType(Copy(Hash, 1, 4));
  BCryptCost := StrToInt(Copy(Hash, 5, 2));
  BCryptSalt := Copy(Hash, 8, 22);
  BCryptHash := Copy(Hash, 30, 60);

  PasswordInfo.Algo := HashType;
  PasswordInfo.Cost := BCryptCost;
  PasswordInfo.AlgoName := 'bcrypt';
  PasswordInfo.BCryptSalt := BCryptSalt;
  PasswordInfo.BCryptHash := BCryptHash;

  Result := PasswordInfo;
end;

end.