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annotate NaCl/crypto_hash/sha512.cs @ 72:b7d981ccd434

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NaCl: improved sha512 implementation
author Ivo Smits <Ivo@UCIS.nl>
date Sat, 02 Nov 2013 15:59:51 +0100
parents 7e9d1cfcc562
children
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1 ???using System;
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2
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3 namespace UCIS.NaCl.crypto_hash {
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4 public static class sha512 {
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5 public static int BYTES = 64;
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6
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7 public static unsafe void crypto_hash(Byte[] outv, Byte[] inv, int inlen) {
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8 if (outv.Length < 64) throw new ArgumentException("outv.Length < 64");
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9 if (inv.Length < inlen) throw new ArgumentException("inv.Length < inlen");
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10 fixed (Byte* outp = outv, inp = inv) crypto_hash(outp, inp, (UInt64)inlen);
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11 }
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12 public static unsafe void crypto_hash(Byte* outp, Byte* inp, UInt64 inlen) {
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13 sha512state state = new sha512state();
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14 state.init();
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15 state.process(inp, (int)inlen);
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16 state.finish(outp);
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17 }
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19 public unsafe struct sha512state {
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20 fixed UInt64 state[8];
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21 fixed Byte input[128];
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22 int offset;
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23 int length;
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25 public unsafe void init() {
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26 fixed (UInt64* s = state) {
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27 s[0] = 0x6a09e667f3bcc908; s[1] = 0xbb67ae8584caa73b; s[2] = 0x3c6ef372fe94f82b; s[3] = 0xa54ff53a5f1d36f1;
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28 s[4] = 0x510e527fade682d1; s[5] = 0x9b05688c2b3e6c1f; s[6] = 0x1f83d9abfb41bd6b; s[7] = 0x5be0cd19137e2179;
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29 }
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30 offset = 0;
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31 length = 0;
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32 }
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33 public unsafe void process(Byte* inp, int inlen) {
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34 fixed (sha512state* pthis = &this) {
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35 length += inlen;
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36 if (offset > 0) {
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37 int blen = 128 - offset;
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38 if (blen > inlen) blen = inlen;
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39 for (int i = 0; i < blen; i++) pthis->input[offset++] = *inp++;
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40 inlen -= blen;
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41 }
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42 if (offset == 128) {
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43 crypto_hashblocks.sha512.crypto_hashblocks(pthis->state, pthis->input, (UInt64)offset);
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44 offset = 0;
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45 }
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46 if (inlen >= 128) {
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47 crypto_hashblocks.sha512.crypto_hashblocks(pthis->state, inp, (UInt64)inlen);
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48 inp += inlen;
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49 inlen &= 127;
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50 inp -= inlen;
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51 }
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52 if (inlen > 0) {
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53 for (int i = 0; i < inlen; i++) pthis->input[offset++] = *inp++;
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54 }
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55 }
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56 }
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57 public unsafe void finish(Byte* outp) {
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58 fixed (sha512state* s = &this) {
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59 s->input[offset++] = 0x80;
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60 if (offset > 112) {
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61 for (int i = offset; i < 128; i++) s->input[i] = 0;
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62 crypto_hashblocks.sha512.crypto_hashblocks(s->state, s->input, 128);
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63 offset = 0;
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64 }
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65 for (int i = offset; i < 119; i++) s->input[i] = 0;
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66 UInt64 bytes = (UInt64)length;
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67 s->input[119] = (Byte)(bytes >> 61);
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68 s->input[120] = (Byte)(bytes >> 53);
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69 s->input[121] = (Byte)(bytes >> 45);
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70 s->input[122] = (Byte)(bytes >> 37);
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71 s->input[123] = (Byte)(bytes >> 29);
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72 s->input[124] = (Byte)(bytes >> 21);
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73 s->input[125] = (Byte)(bytes >> 13);
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74 s->input[126] = (Byte)(bytes >> 5);
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75 s->input[127] = (Byte)(bytes << 3);
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76 crypto_hashblocks.sha512.crypto_hashblocks(s->state, s->input, 128);
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77 crypto_hashblocks.sha512.crypto_hashblocks_state_pack(outp, s->state);
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78 }
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79 }
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81 }
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82 }