inga-lovinde
/
TrustPilotChallenge
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Further MD5 optimizations

Browse Source
performance-simd-rust
Inga 🏳‍🌈 8 years ago
parent d9c2cad4b6
commit e5c1e743bc
2 changed files with 67 additions and 55 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Show Stats Download Patch File Download Diff File
  1. 17
      README.md
  2. 103
      WhiteRabbit/MD5Digest.cs

17
README.md
Unescape View File

@ -41,19 +41,28 @@ Anagrams generation is not parallelized, as even single-threaded performance for
Multi-threaded performance with RyuJIT (.NET 4.6, 64-bit system) on quad-core Sandy Bridge @2.8GHz is as follows: Multi-threaded performance with RyuJIT (.NET 4.6, 64-bit system) on quad-core Sandy Bridge @2.8GHz is as follows:
* If only phrases of at most 4 words are allowed, then it takes **around 2 seconds** to find and check all 7433016 anagrams; all hashes are solved in first 0.4 seconds. * If only phrases of at most 4 words are allowed, then it takes **less than 2 seconds** to find and check all 7433016 anagrams; all hashes are solved in first 0.3 seconds.
* If phrases of 5 words are allowed as well, then it takes around 5.5 minutes to find and check all 1348876896 anagrams; all hashes are solved in first 8.5 seconds. * If phrases of 5 words are allowed as well, then it takes around 5 minutes to find and check all 1348876896 anagrams; all hashes are solved in first 7.5 seconds.
Most of time is spent on MD5 computations for correct anagrams, so there is not a lot to optimize further. Most of time is spent on MD5 computations for correct anagrams, so there is not a lot to optimize further.
* If phrases of 6 words are allowed as well, then "more difficult" hash is solved in 9 seconds, "easiest" in 50 seconds, and "hard" in 2 minutes. * If phrases of 6 words are allowed as well, then "more difficult" hash is solved in 8 seconds, "easiest" in 48 seconds, and "hard" in less than 2 minutes.
* If phrases of 7 words are allowed as well, then "more difficult" hash is solved in 56 seconds, "easiest" in 7 minutes, and "hard" in 18 minutes. * If phrases of 7 words are allowed as well, then "more difficult" hash is solved in 46 seconds, "easiest" in less than 6 minutes, and "hard" in around 15 minutes.
Note that all measurements were done on a Release build; Debug build is significantly slower. Note that all measurements were done on a Release build; Debug build is significantly slower.
For comparison, certain other solutions available on GitHub seem to require 3 hours to find all 3-word anagrams. This solution is faster by 5-7 orders of magnitude (it finds and checks all 4-word anagrams in 1/2000th fraction of time required for other solution just to find all 3-word anagrams, with no MD5 calculations). For comparison, certain other solutions available on GitHub seem to require 3 hours to find all 3-word anagrams. This solution is faster by 5-7 orders of magnitude (it finds and checks all 4-word anagrams in 1/2000th fraction of time required for other solution just to find all 3-word anagrams, with no MD5 calculations).
Conditional compilation symbols
===============================
* Define `BIG_ENDIAN` if you plan to run this on big-endian PC; this will disable certain MD5 optimizations that only produce correct result on little-endian PCs.
* Define `SINGLE_THREADED` to use standard enumerables instead of ParallelEnumerable.
* Define `DEBUG`, or build in debug mode, to get the total number of anagrams (not optimized, memory-hogging).
Implementation notes Implementation notes
==================== ====================

103
WhiteRabbit/MD5Digest.cs
Unescape View File

@ -4,6 +4,7 @@
/** /**
* Code taken from BouncyCastle and optimized for specific constraints (e.g. input is always larger than 4 bytes and smaller than 52 bytes). * Code taken from BouncyCastle and optimized for specific constraints (e.g. input is always larger than 4 bytes and smaller than 52 bytes).
* Further optimization: input could be assumed to be smaller than 27 bytes (original phrase contains 18 letters, so that allows anagrams of 9 words)
* base implementation of MD4 family style digest as outlined in * base implementation of MD4 family style digest as outlined in
* "Handbook of Applied Cryptography", pages 344 - 347. * "Handbook of Applied Cryptography", pages 344 - 347.
* implementation of MD5 as outlined in "Handbook of Applied Cryptography", pages 346 - 347. * implementation of MD5 as outlined in "Handbook of Applied Cryptography", pages 346 - 347.
@ -14,26 +15,28 @@
{ {
var length = input.Length; var length = input.Length;
var xBytes = new byte[4 * 14]; var xUints = new uint[8]; // it seems that alignment helps
Buffer.BlockCopy(input, 0, xBytes, 0, length); #if BIG_ENDIAN
xBytes[length] = 128; xUints[0] = LE_To_UInt32(xBytes, 4 * 0);
xUints[1] = LE_To_UInt32(xBytes, 4 * 1);
xUints[2] = LE_To_UInt32(xBytes, 4 * 2);
xUints[3] = LE_To_UInt32(xBytes, 4 * 3);
xUints[4] = LE_To_UInt32(xBytes, 4 * 4);
xUints[5] = LE_To_UInt32(xBytes, 4 * 5);
xUints[6] = LE_To_UInt32(xBytes, 4 * 6);
#else
Buffer.BlockCopy(input, 0, xUints, 0, length);
#endif
xUints[length >> 2] |= (uint)128 << (8 * (length & 3));
var x0 = LE_To_UInt32(xBytes, 4 * 0); var x0 = xUints[0];
var x1 = LE_To_UInt32(xBytes, 4 * 1); var x1 = xUints[1];
var x2 = LE_To_UInt32(xBytes, 4 * 2); var x2 = xUints[2];
var x3 = LE_To_UInt32(xBytes, 4 * 3); var x3 = xUints[3];
var x4 = LE_To_UInt32(xBytes, 4 * 4); var x4 = xUints[4];
var x5 = LE_To_UInt32(xBytes, 4 * 5); var x5 = xUints[5];
var x6 = LE_To_UInt32(xBytes, 4 * 6); var x6 = xUints[6];
var x7 = LE_To_UInt32(xBytes, 4 * 7);
var x8 = LE_To_UInt32(xBytes, 4 * 8);
var x9 = LE_To_UInt32(xBytes, 4 * 9);
var x10 = LE_To_UInt32(xBytes, 4 * 10);
var x11 = LE_To_UInt32(xBytes, 4 * 11);
var x12 = LE_To_UInt32(xBytes, 4 * 12);
var x13 = LE_To_UInt32(xBytes, 4 * 13);
var x14 = (uint)(length << 3); var x14 = (uint)(length << 3);
uint x15 = 0;
uint a = 0x67452301; uint a = 0x67452301;
uint b = 0xefcdab89; uint b = 0xefcdab89;
@ -47,66 +50,66 @@
a = LeftRotate(x4 + 0xf57c0faf + a + ((b & c) | (~b & d)), 7, 32 - 7) + b; a = LeftRotate(x4 + 0xf57c0faf + a + ((b & c) | (~b & d)), 7, 32 - 7) + b;
d = LeftRotate(x5 + 0x4787c62a + d + ((a & b) | (~a & c)), 12, 32 - 12) + a; d = LeftRotate(x5 + 0x4787c62a + d + ((a & b) | (~a & c)), 12, 32 - 12) + a;
c = LeftRotate(x6 + 0xa8304613 + c + ((d & a) | (~d & b)), 17, 32 - 17) + d; c = LeftRotate(x6 + 0xa8304613 + c + ((d & a) | (~d & b)), 17, 32 - 17) + d;
b = LeftRotate(x7 + 0xfd469501 + b + ((c & d) | (~c & a)), 22, 32 - 22) + c; b = LeftRotate(0xfd469501 + b + ((c & d) | (~c & a)), 22, 32 - 22) + c;
a = LeftRotate(x8 + 0x698098d8 + a + ((b & c) | (~b & d)), 7, 32 - 7) + b; a = LeftRotate(0x698098d8 + a + ((b & c) | (~b & d)), 7, 32 - 7) + b;
d = LeftRotate(x9 + 0x8b44f7af + d + ((a & b) | (~a & c)), 12, 32 - 12) + a; d = LeftRotate(0x8b44f7af + d + ((a & b) | (~a & c)), 12, 32 - 12) + a;
c = LeftRotate(x10 + 0xffff5bb1 + c + ((d & a) | (~d & b)), 17, 32 - 17) + d; c = LeftRotate(0xffff5bb1 + c + ((d & a) | (~d & b)), 17, 32 - 17) + d;
b = LeftRotate(x11 + 0x895cd7be + b + ((c & d) | (~c & a)), 22, 32 - 22) + c; b = LeftRotate(0x895cd7be + b + ((c & d) | (~c & a)), 22, 32 - 22) + c;
a = LeftRotate(x12 + 0x6b901122 + a + ((b & c) | (~b & d)), 7, 32 - 7) + b; a = LeftRotate(0x6b901122 + a + ((b & c) | (~b & d)), 7, 32 - 7) + b;
d = LeftRotate(x13 + 0xfd987193 + d + ((a & b) | (~a & c)), 12, 32 - 12) + a; d = LeftRotate(0xfd987193 + d + ((a & b) | (~a & c)), 12, 32 - 12) + a;
c = LeftRotate(x14 + 0xa679438e + c + ((d & a) | (~d & b)), 17, 32 - 17) + d; c = LeftRotate(x14 + 0xa679438e + c + ((d & a) | (~d & b)), 17, 32 - 17) + d;
b = LeftRotate(x15 + 0x49b40821 + b + ((c & d) | (~c & a)), 22, 32 - 22) + c; b = LeftRotate(0x49b40821 + b + ((c & d) | (~c & a)), 22, 32 - 22) + c;
a = LeftRotate(x1 + 0xf61e2562 + a + ((b & d) | (c & ~d)), 5, 32 - 5) + b; a = LeftRotate(x1 + 0xf61e2562 + a + ((b & d) | (c & ~d)), 5, 32 - 5) + b;
d = LeftRotate(x6 + 0xc040b340 + d + ((a & c) | (b & ~c)), 9, 32 - 9) + a; d = LeftRotate(x6 + 0xc040b340 + d + ((a & c) | (b & ~c)), 9, 32 - 9) + a;
c = LeftRotate(x11 + 0x265e5a51 + c + ((d & b) | (a & ~b)), 14, 32 - 14) + d; c = LeftRotate(0x265e5a51 + c + ((d & b) | (a & ~b)), 14, 32 - 14) + d;
b = LeftRotate(x0 + 0xe9b6c7aa + b + ((c & a) | (d & ~a)), 20, 32 - 20) + c; b = LeftRotate(x0 + 0xe9b6c7aa + b + ((c & a) | (d & ~a)), 20, 32 - 20) + c;
a = LeftRotate(x5 + 0xd62f105d + a + ((b & d) | (c & ~d)), 5, 32 - 5) + b; a = LeftRotate(x5 + 0xd62f105d + a + ((b & d) | (c & ~d)), 5, 32 - 5) + b;
d = LeftRotate(x10 + 0x2441453 + d + ((a & c) | (b & ~c)), 9, 32 - 9) + a; d = LeftRotate(0x2441453 + d + ((a & c) | (b & ~c)), 9, 32 - 9) + a;
c = LeftRotate(x15 + 0xd8a1e681 + c + ((d & b) | (a & ~b)), 14, 32 - 14) + d; c = LeftRotate(0xd8a1e681 + c + ((d & b) | (a & ~b)), 14, 32 - 14) + d;
b = LeftRotate(x4 + 0xe7d3fbc8 + b + ((c & a) | (d & ~a)), 20, 32 - 20) + c; b = LeftRotate(x4 + 0xe7d3fbc8 + b + ((c & a) | (d & ~a)), 20, 32 - 20) + c;
a = LeftRotate(x9 + 0x21e1cde6 + a + ((b & d) | (c & ~d)), 5, 32 - 5) + b; a = LeftRotate(0x21e1cde6 + a + ((b & d) | (c & ~d)), 5, 32 - 5) + b;
d = LeftRotate(x14 + 0xc33707d6 + d + ((a & c) | (b & ~c)), 9, 32 - 9) + a; d = LeftRotate(x14 + 0xc33707d6 + d + ((a & c) | (b & ~c)), 9, 32 - 9) + a;
c = LeftRotate(x3 + 0xf4d50d87 + c + ((d & b) | (a & ~b)), 14, 32 - 14) + d; c = LeftRotate(x3 + 0xf4d50d87 + c + ((d & b) | (a & ~b)), 14, 32 - 14) + d;
b = LeftRotate(x8 + 0x455a14ed + b + ((c & a) | (d & ~a)), 20, 32 - 20) + c; b = LeftRotate(0x455a14ed + b + ((c & a) | (d & ~a)), 20, 32 - 20) + c;
a = LeftRotate(x13 + 0xa9e3e905 + a + ((b & d) | (c & ~d)), 5, 32 - 5) + b; a = LeftRotate(0xa9e3e905 + a + ((b & d) | (c & ~d)), 5, 32 - 5) + b;
d = LeftRotate(x2 + 0xfcefa3f8 + d + ((a & c) | (b & ~c)), 9, 32 - 9) + a; d = LeftRotate(x2 + 0xfcefa3f8 + d + ((a & c) | (b & ~c)), 9, 32 - 9) + a;
c = LeftRotate(x7 + 0x676f02d9 + c + ((d & b) | (a & ~b)), 14, 32 - 14) + d; c = LeftRotate(0x676f02d9 + c + ((d & b) | (a & ~b)), 14, 32 - 14) + d;
b = LeftRotate(x12 + 0x8d2a4c8a + b + ((c & a) | (d & ~a)), 20, 32 - 20) + c; b = LeftRotate(0x8d2a4c8a + b + ((c & a) | (d & ~a)), 20, 32 - 20) + c;
a = LeftRotate(x5 + 0xfffa3942 + a + (b ^ c ^ d), 4, 32 - 4) + b; a = LeftRotate(x5 + 0xfffa3942 + a + (b ^ c ^ d), 4, 32 - 4) + b;
d = LeftRotate(x8 + 0x8771f681 + d + (a ^ b ^ c), 11, 32 - 11) + a; d = LeftRotate(0x8771f681 + d + (a ^ b ^ c), 11, 32 - 11) + a;
c = LeftRotate(x11 + 0x6d9d6122 + c + (d ^ a ^ b), 16, 32 - 16) + d; c = LeftRotate(0x6d9d6122 + c + (d ^ a ^ b), 16, 32 - 16) + d;
b = LeftRotate(x14 + 0xfde5380c + b + (c ^ d ^ a), 23, 32 - 23) + c; b = LeftRotate(x14 + 0xfde5380c + b + (c ^ d ^ a), 23, 32 - 23) + c;
a = LeftRotate(x1 + 0xa4beea44 + a + (b ^ c ^ d), 4, 32 - 4) + b; a = LeftRotate(x1 + 0xa4beea44 + a + (b ^ c ^ d), 4, 32 - 4) + b;
d = LeftRotate(x4 + 0x4bdecfa9 + d + (a ^ b ^ c), 11, 32 - 11) + a; d = LeftRotate(x4 + 0x4bdecfa9 + d + (a ^ b ^ c), 11, 32 - 11) + a;
c = LeftRotate(x7 + 0xf6bb4b60 + c + (d ^ a ^ b), 16, 32 - 16) + d; c = LeftRotate(0xf6bb4b60 + c + (d ^ a ^ b), 16, 32 - 16) + d;
b = LeftRotate(x10 + 0xbebfbc70 + b + (c ^ d ^ a), 23, 32 - 23) + c; b = LeftRotate(0xbebfbc70 + b + (c ^ d ^ a), 23, 32 - 23) + c;
a = LeftRotate(x13 + 0x289b7ec6 + a + (b ^ c ^ d), 4, 32 - 4) + b; a = LeftRotate(0x289b7ec6 + a + (b ^ c ^ d), 4, 32 - 4) + b;
d = LeftRotate(x0 + 0xeaa127fa + d + (a ^ b ^ c), 11, 32 - 11) + a; d = LeftRotate(x0 + 0xeaa127fa + d + (a ^ b ^ c), 11, 32 - 11) + a;
c = LeftRotate(x3 + 0xd4ef3085 + c + (d ^ a ^ b), 16, 32 - 16) + d; c = LeftRotate(x3 + 0xd4ef3085 + c + (d ^ a ^ b), 16, 32 - 16) + d;
b = LeftRotate(x6 + 0x4881d05 + b + (c ^ d ^ a), 23, 32 - 23) + c; b = LeftRotate(x6 + 0x4881d05 + b + (c ^ d ^ a), 23, 32 - 23) + c;
a = LeftRotate(x9 + 0xd9d4d039 + a + (b ^ c ^ d), 4, 32 - 4) + b; a = LeftRotate(0xd9d4d039 + a + (b ^ c ^ d), 4, 32 - 4) + b;
d = LeftRotate(x12 + 0xe6db99e5 + d + (a ^ b ^ c), 11, 32 - 11) + a; d = LeftRotate(0xe6db99e5 + d + (a ^ b ^ c), 11, 32 - 11) + a;
c = LeftRotate(x15 + 0x1fa27cf8 + c + (d ^ a ^ b), 16, 32 - 16) + d; c = LeftRotate(0x1fa27cf8 + c + (d ^ a ^ b), 16, 32 - 16) + d;
b = LeftRotate(x2 + 0xc4ac5665 + b + (c ^ d ^ a), 23, 32 - 23) + c; b = LeftRotate(x2 + 0xc4ac5665 + b + (c ^ d ^ a), 23, 32 - 23) + c;
a = LeftRotate(x0 + 0xf4292244 + a + (c ^ (b | ~d)), 6, 32 - 6) + b; a = LeftRotate(x0 + 0xf4292244 + a + (c ^ (b | ~d)), 6, 32 - 6) + b;
d = LeftRotate(x7 + 0x432aff97 + d + (b ^ (a | ~c)), 10, 32 - 10) + a; d = LeftRotate(0x432aff97 + d + (b ^ (a | ~c)), 10, 32 - 10) + a;
c = LeftRotate(x14 + 0xab9423a7 + c + (a ^ (d | ~b)), 15, 32 - 15) + d; c = LeftRotate(x14 + 0xab9423a7 + c + (a ^ (d | ~b)), 15, 32 - 15) + d;
b = LeftRotate(x5 + 0xfc93a039 + b + (d ^ (c | ~a)), 21, 32 - 21) + c; b = LeftRotate(x5 + 0xfc93a039 + b + (d ^ (c | ~a)), 21, 32 - 21) + c;
a = LeftRotate(x12 + 0x655b59c3 + a + (c ^ (b | ~d)), 6, 32 - 6) + b; a = LeftRotate(0x655b59c3 + a + (c ^ (b | ~d)), 6, 32 - 6) + b;
d = LeftRotate(x3 + 0x8f0ccc92 + d + (b ^ (a | ~c)), 10, 32 - 10) + a; d = LeftRotate(x3 + 0x8f0ccc92 + d + (b ^ (a | ~c)), 10, 32 - 10) + a;
c = LeftRotate(x10 + 0xffeff47d + c + (a ^ (d | ~b)), 15, 32 - 15) + d; c = LeftRotate(0xffeff47d + c + (a ^ (d | ~b)), 15, 32 - 15) + d;
b = LeftRotate(x1 + 0x85845dd1 + b + (d ^ (c | ~a)), 21, 32 - 21) + c; b = LeftRotate(x1 + 0x85845dd1 + b + (d ^ (c | ~a)), 21, 32 - 21) + c;
a = LeftRotate(x8 + 0x6fa87e4f + a + (c ^ (b | ~d)), 6, 32 - 6) + b; a = LeftRotate(0x6fa87e4f + a + (c ^ (b | ~d)), 6, 32 - 6) + b;
d = LeftRotate(x15 + 0xfe2ce6e0 + d + (b ^ (a | ~c)), 10, 32 - 10) + a; d = LeftRotate(0xfe2ce6e0 + d + (b ^ (a | ~c)), 10, 32 - 10) + a;
c = LeftRotate(x6 + 0xa3014314 + c + (a ^ (d | ~b)), 15, 32 - 15) + d; c = LeftRotate(x6 + 0xa3014314 + c + (a ^ (d | ~b)), 15, 32 - 15) + d;
b = LeftRotate(x13 + 0x4e0811a1 + b + (d ^ (c | ~a)), 21, 32 - 21) + c; b = LeftRotate(0x4e0811a1 + b + (d ^ (c | ~a)), 21, 32 - 21) + c;
a = LeftRotate(x4 + 0xf7537e82 + a + (c ^ (b | ~d)), 6, 32 - 6) + b; a = LeftRotate(x4 + 0xf7537e82 + a + (c ^ (b | ~d)), 6, 32 - 6) + b;
d = LeftRotate(x11 + 0xbd3af235 + d + (b ^ (a | ~c)), 10, 32 - 10) + a; d = LeftRotate(0xbd3af235 + d + (b ^ (a | ~c)), 10, 32 - 10) + a;
c = LeftRotate(x2 + 0x2ad7d2bb + c + (a ^ (d | ~b)), 15, 32 - 15) + d; c = LeftRotate(x2 + 0x2ad7d2bb + c + (a ^ (d | ~b)), 15, 32 - 15) + d;
b = LeftRotate(x9 + 0xeb86d391 + b + (d ^ (c | ~a)), 21, 32 - 21) + c; b = LeftRotate(0xeb86d391 + b + (d ^ (c | ~a)), 21, 32 - 21) + c;
return new[] return new[]
{ {

Write Preview
Loading…
Cancel
Save