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

Code cleanup

Browse Source
flocal-proof
Inga 🏳‍🌈 8 years ago
parent 581572fa4e
commit 6b8c2f56b6
2 changed files with 93 additions and 71 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. 4
      README.md
  2. 160
      dotnet/WhiteRabbit/MD5Digest.cs

4
README.md
Unescape View File

@ -110,3 +110,7 @@ There is no need in processing all the words that are too large to be useful at
11. Filtering the original dictionary (e.g. throwing away all single-letter words) does not really improve the performance, thanks to the optimizations mentioned in notes 7-9.
This solution finds all anagrams, including those with single-letter words.
12. MD5 computation could be further optimized by:
* Using CPU instructions for rotation (implemented in not yet released version of RyuJIT): https://github.com/dotnet/coreclr/pull/1830
* Computing several MD5 hashes in parallel on each core, using SSE (4 hashes / core) or AVX2 (8 hashes / core). However, even bit shifts on vectors are not yet supported by .NET: https://github.com/dotnet/coreclr/issues/3226

160
dotnet/WhiteRabbit/MD5Digest.cs
Unescape View File

@ -1,9 +1,7 @@
namespace WhiteRabbit
{
using System;
using System.Linq;
using System.Reflection;
using System.Runtime.CompilerServices;
namespace WhiteRabbit
{
/**
* 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)
@ -13,6 +11,7 @@
*/
internal static class MD5Digest
{
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static unsafe uint[] Compute(Phrase input)
{
uint a = 0x67452301;
@ -20,73 +19,73 @@
uint c = 0x98badcfe;
uint d = 0x10325476;
a = LeftRotate(input.Buffer[0] + 0xd76aa478 + a + ((b & c) | (~b & d)), 7, 32 - 7) + b;
d = LeftRotate(input.Buffer[1] + 0xe8c7b756 + d + ((a & b) | (~a & c)), 12, 32 - 12) + a;
c = LeftRotate(input.Buffer[2] + 0x242070db + c + ((d & a) | (~d & b)), 17, 32 - 17) + d;
b = LeftRotate(input.Buffer[3] + 0xc1bdceee + b + ((c & d) | (~c & a)), 22, 32 - 22) + c;
a = LeftRotate(input.Buffer[4] + 0xf57c0faf + a + ((b & c) | (~b & d)), 7, 32 - 7) + b;
d = LeftRotate(input.Buffer[5] + 0x4787c62a + d + ((a & b) | (~a & c)), 12, 32 - 12) + a;
c = LeftRotate(input.Buffer[6] + 0xa8304613 + c + ((d & a) | (~d & b)), 17, 32 - 17) + d;
b = LeftRotate(0xfd469501 + b + ((c & d) | (~c & a)), 22, 32 - 22) + c;
a = LeftRotate(0x698098d8 + a + ((b & c) | (~b & d)), 7, 32 - 7) + b;
d = LeftRotate(0x8b44f7af + d + ((a & b) | (~a & c)), 12, 32 - 12) + a;
c = LeftRotate(0xffff5bb1 + c + ((d & a) | (~d & b)), 17, 32 - 17) + d;
b = LeftRotate(0x895cd7be + b + ((c & d) | (~c & a)), 22, 32 - 22) + c;
a = LeftRotate(0x6b901122 + a + ((b & c) | (~b & d)), 7, 32 - 7) + b;
d = LeftRotate(0xfd987193 + d + ((a & b) | (~a & c)), 12, 32 - 12) + a;
c = LeftRotate(input.Buffer[7] + 0xa679438e + c + ((d & a) | (~d & b)), 17, 32 - 17) + d;
b = LeftRotate(0x49b40821 + b + ((c & d) | (~c & a)), 22, 32 - 22) + c;
a = b + LeftRotate(0xd76aa478 + a + Blend(d, c, b) + input.Buffer[0], 7);
d = a + LeftRotate(0xe8c7b756 + d + Blend(c, b, a) + input.Buffer[1], 12);
c = d + LeftRotate(0x242070db + c + Blend(b, a, d) + input.Buffer[2], 17);
b = c + LeftRotate(0xc1bdceee + b + Blend(a, d, c) + input.Buffer[3], 22);
a = b + LeftRotate(0xf57c0faf + a + Blend(d, c, b) + input.Buffer[4], 7);
d = a + LeftRotate(0x4787c62a + d + Blend(c, b, a) + input.Buffer[5], 12);
c = d + LeftRotate(0xa8304613 + c + Blend(b, a, d) + input.Buffer[6], 17);
b = c + LeftRotate(0xfd469501 + b + Blend(a, d, c), 22);
a = b + LeftRotate(0x698098d8 + a + Blend(d, c, b), 7);
d = a + LeftRotate(0x8b44f7af + d + Blend(c, b, a), 12);
c = d + LeftRotate(0xffff5bb1 + c + Blend(b, a, d), 17);
b = c + LeftRotate(0x895cd7be + b + Blend(a, d, c), 22);
a = b + LeftRotate(0x6b901122 + a + Blend(d, c, b), 7);
d = a + LeftRotate(0xfd987193 + d + Blend(c, b, a), 12);
c = d + LeftRotate(0xa679438e + c + Blend(b, a, d) + input.Buffer[7], 17);
b = c + LeftRotate(0x49b40821 + b + Blend(a, d, c), 22);
a = LeftRotate(input.Buffer[1] + 0xf61e2562 + a + ((b & d) | (c & ~d)), 5, 32 - 5) + b;
d = LeftRotate(input.Buffer[6] + 0xc040b340 + d + ((a & c) | (b & ~c)), 9, 32 - 9) + a;
c = LeftRotate(0x265e5a51 + c + ((d & b) | (a & ~b)), 14, 32 - 14) + d;
b = LeftRotate(input.Buffer[0] + 0xe9b6c7aa + b + ((c & a) | (d & ~a)), 20, 32 - 20) + c;
a = LeftRotate(input.Buffer[5] + 0xd62f105d + a + ((b & d) | (c & ~d)), 5, 32 - 5) + b;
d = LeftRotate(0x2441453 + d + ((a & c) | (b & ~c)), 9, 32 - 9) + a;
c = LeftRotate(0xd8a1e681 + c + ((d & b) | (a & ~b)), 14, 32 - 14) + d;
b = LeftRotate(input.Buffer[4] + 0xe7d3fbc8 + b + ((c & a) | (d & ~a)), 20, 32 - 20) + c;
a = LeftRotate(0x21e1cde6 + a + ((b & d) | (c & ~d)), 5, 32 - 5) + b;
d = LeftRotate(input.Buffer[7] + 0xc33707d6 + d + ((a & c) | (b & ~c)), 9, 32 - 9) + a;
c = LeftRotate(input.Buffer[3] + 0xf4d50d87 + c + ((d & b) | (a & ~b)), 14, 32 - 14) + d;
b = LeftRotate(0x455a14ed + b + ((c & a) | (d & ~a)), 20, 32 - 20) + c;
a = LeftRotate(0xa9e3e905 + a + ((b & d) | (c & ~d)), 5, 32 - 5) + b;
d = LeftRotate(input.Buffer[2] + 0xfcefa3f8 + d + ((a & c) | (b & ~c)), 9, 32 - 9) + a;
c = LeftRotate(0x676f02d9 + c + ((d & b) | (a & ~b)), 14, 32 - 14) + d;
b = LeftRotate(0x8d2a4c8a + b + ((c & a) | (d & ~a)), 20, 32 - 20) + c;
a = b + LeftRotate(0xf61e2562 + a + Blend(c, b, d) + input.Buffer[1], 5);
d = a + LeftRotate(0xc040b340 + d + Blend(b, a, c) + input.Buffer[6], 9);
c = d + LeftRotate(0x265e5a51 + c + Blend(a, d, b), 14);
b = c + LeftRotate(0xe9b6c7aa + b + Blend(d, c, a) + input.Buffer[0], 20);
a = b + LeftRotate(0xd62f105d + a + Blend(c, b, d) + input.Buffer[5], 5);
d = a + LeftRotate(0x02441453 + d + Blend(b, a, c), 9);
c = d + LeftRotate(0xd8a1e681 + c + Blend(a, d, b), 14);
b = c + LeftRotate(0xe7d3fbc8 + b + Blend(d, c, a) + input.Buffer[4], 20);
a = b + LeftRotate(0x21e1cde6 + a + Blend(c, b, d), 5);
d = a + LeftRotate(0xc33707d6 + d + Blend(b, a, c) + input.Buffer[7], 9);
c = d + LeftRotate(0xf4d50d87 + c + Blend(a, d, b) + input.Buffer[3], 14);
b = c + LeftRotate(0x455a14ed + b + Blend(d, c, a), 20);
a = b + LeftRotate(0xa9e3e905 + a + Blend(c, b, d), 5);
d = a + LeftRotate(0xfcefa3f8 + d + Blend(b, a, c) + input.Buffer[2], 9);
c = d + LeftRotate(0x676f02d9 + c + Blend(a, d, b), 14);
b = c + LeftRotate(0x8d2a4c8a + b + Blend(d, c, a), 20);
a = LeftRotate(input.Buffer[5] + 0xfffa3942 + a + (b ^ c ^ d), 4, 32 - 4) + b;
d = LeftRotate(0x8771f681 + d + (a ^ b ^ c), 11, 32 - 11) + a;
c = LeftRotate(0x6d9d6122 + c + (d ^ a ^ b), 16, 32 - 16) + d;
b = LeftRotate(input.Buffer[7] + 0xfde5380c + b + (c ^ d ^ a), 23, 32 - 23) + c;
a = LeftRotate(input.Buffer[1] + 0xa4beea44 + a + (b ^ c ^ d), 4, 32 - 4) + b;
d = LeftRotate(input.Buffer[4] + 0x4bdecfa9 + d + (a ^ b ^ c), 11, 32 - 11) + a;
c = LeftRotate(0xf6bb4b60 + c + (d ^ a ^ b), 16, 32 - 16) + d;
b = LeftRotate(0xbebfbc70 + b + (c ^ d ^ a), 23, 32 - 23) + c;
a = LeftRotate(0x289b7ec6 + a + (b ^ c ^ d), 4, 32 - 4) + b;
d = LeftRotate(input.Buffer[0] + 0xeaa127fa + d + (a ^ b ^ c), 11, 32 - 11) + a;
c = LeftRotate(input.Buffer[3] + 0xd4ef3085 + c + (d ^ a ^ b), 16, 32 - 16) + d;
b = LeftRotate(input.Buffer[6] + 0x4881d05 + b + (c ^ d ^ a), 23, 32 - 23) + c;
a = LeftRotate(0xd9d4d039 + a + (b ^ c ^ d), 4, 32 - 4) + b;
d = LeftRotate(0xe6db99e5 + d + (a ^ b ^ c), 11, 32 - 11) + a;
c = LeftRotate(0x1fa27cf8 + c + (d ^ a ^ b), 16, 32 - 16) + d;
b = LeftRotate(input.Buffer[2] + 0xc4ac5665 + b + (c ^ d ^ a), 23, 32 - 23) + c;
a = b + LeftRotate(0xfffa3942 + a + Xor(b, c, d) + input.Buffer[5], 4);
d = a + LeftRotate(0x8771f681 + d + Xor(a, b, c), 11);
c = d + LeftRotate(0x6d9d6122 + c + Xor(d, a, b), 16);
b = c + LeftRotate(0xfde5380c + b + Xor(c, d, a) + input.Buffer[7], 23);
a = b + LeftRotate(0xa4beea44 + a + Xor(b, c, d) + input.Buffer[1], 4);
d = a + LeftRotate(0x4bdecfa9 + d + Xor(a, b, c) + input.Buffer[4], 11);
c = d + LeftRotate(0xf6bb4b60 + c + Xor(d, a, b), 16);
b = c + LeftRotate(0xbebfbc70 + b + Xor(c, d, a), 23);
a = b + LeftRotate(0x289b7ec6 + a + Xor(b, c, d), 4);
d = a + LeftRotate(0xeaa127fa + d + Xor(a, b, c) + input.Buffer[0], 11);
c = d + LeftRotate(0xd4ef3085 + c + Xor(d, a, b) + input.Buffer[3], 16);
b = c + LeftRotate(0x04881d05 + b + Xor(c, d, a) + input.Buffer[6], 23);
a = b + LeftRotate(0xd9d4d039 + a + Xor(b, c, d), 4);
d = a + LeftRotate(0xe6db99e5 + d + Xor(a, b, c), 11);
c = d + LeftRotate(0x1fa27cf8 + c + Xor(d, a, b), 16);
b = c + LeftRotate(0xc4ac5665 + b + Xor(c, d, a) + input.Buffer[2], 23);
a = LeftRotate(input.Buffer[0] + 0xf4292244 + a + (c ^ (b | ~d)), 6, 32 - 6) + b;
d = LeftRotate(0x432aff97 + d + (b ^ (a | ~c)), 10, 32 - 10) + a;
c = LeftRotate(input.Buffer[7] + 0xab9423a7 + c + (a ^ (d | ~b)), 15, 32 - 15) + d;
b = LeftRotate(input.Buffer[5] + 0xfc93a039 + b + (d ^ (c | ~a)), 21, 32 - 21) + c;
a = LeftRotate(0x655b59c3 + a + (c ^ (b | ~d)), 6, 32 - 6) + b;
d = LeftRotate(input.Buffer[3] + 0x8f0ccc92 + d + (b ^ (a | ~c)), 10, 32 - 10) + a;
c = LeftRotate(0xffeff47d + c + (a ^ (d | ~b)), 15, 32 - 15) + d;
b = LeftRotate(input.Buffer[1] + 0x85845dd1 + b + (d ^ (c | ~a)), 21, 32 - 21) + c;
a = LeftRotate(0x6fa87e4f + a + (c ^ (b | ~d)), 6, 32 - 6) + b;
d = LeftRotate(0xfe2ce6e0 + d + (b ^ (a | ~c)), 10, 32 - 10) + a;
c = LeftRotate(input.Buffer[6] + 0xa3014314 + c + (a ^ (d | ~b)), 15, 32 - 15) + d;
b = LeftRotate(0x4e0811a1 + b + (d ^ (c | ~a)), 21, 32 - 21) + c;
a = LeftRotate(input.Buffer[4] + 0xf7537e82 + a + (c ^ (b | ~d)), 6, 32 - 6) + b;
d = LeftRotate(0xbd3af235 + d + (b ^ (a | ~c)), 10, 32 - 10) + a;
c = LeftRotate(input.Buffer[2] + 0x2ad7d2bb + c + (a ^ (d | ~b)), 15, 32 - 15) + d;
b = LeftRotate(0xeb86d391 + b + (d ^ (c | ~a)), 21, 32 - 21) + c;
a = b + LeftRotate(0xf4292244 + a + I(c, b, d) + input.Buffer[0], 6);
d = a + LeftRotate(0x432aff97 + d + I(b, a, c), 10);
c = d + LeftRotate(0xab9423a7 + c + I(a, d, b) + input.Buffer[7], 15);
b = c + LeftRotate(0xfc93a039 + b + I(d, c, a) + input.Buffer[5], 21);
a = b + LeftRotate(0x655b59c3 + a + I(c, b, d), 6);
d = a + LeftRotate(0x8f0ccc92 + d + I(b, a, c) + input.Buffer[3], 10);
c = d + LeftRotate(0xffeff47d + c + I(a, d, b), 15);
b = c + LeftRotate(0x85845dd1 + b + I(d, c, a) + input.Buffer[1], 21);
a = b + LeftRotate(0x6fa87e4f + a + I(c, b, d), 6);
d = a + LeftRotate(0xfe2ce6e0 + d + I(b, a, c), 10);
c = d + LeftRotate(0xa3014314 + c + I(a, d, b) + input.Buffer[6], 15);
b = c + LeftRotate(0x4e0811a1 + b + I(d, c, a), 21);
a = b + LeftRotate(0xf7537e82 + a + I(c, b, d) + input.Buffer[4], 6);
d = a + LeftRotate(0xbd3af235 + d + I(b, a, c), 10);
c = d + LeftRotate(0x2ad7d2bb + c + I(a, d, b) + input.Buffer[2], 15);
b = c + LeftRotate(0xeb86d391 + b + I(d, c, a), 21);
return new[]
{
@ -97,9 +96,28 @@
};
}
private static uint LeftRotate(uint x, int left, int right)
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static uint Blend(uint a, uint b, uint x)
{
return (x & b) | (~x & a);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static uint Xor(uint a, uint b, uint c)
{
return a ^ b ^ c;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static uint I(uint a, uint b, uint c)
{
return a ^ (b | ~c);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static uint LeftRotate(uint x, int left)
{
return (x << left) | (x >> right);
return (x << left) | (x >> 32 - left);
}
}
}

Write Preview
Loading…
Cancel
Save