Diff: SHA2_64.cpp

Revision:

0:7a1237bd2d13

Child:

3:85c6ee25cf3e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SHA2_64.cpp	Sat Sep 07 23:47:28 2013 +0000
@@ -0,0 +1,342 @@
+#include "SHA2_64.h"
+#include <string.h>
+
+
+static const uint64_t K[] =
+{
+   0x428a2f98d728ae22, 0x7137449123ef65cd, 0xb5c0fbcfec4d3b2f, 0xe9b5dba58189dbbc,
+   0x3956c25bf348b538, 0x59f111f1b605d019, 0x923f82a4af194f9b, 0xab1c5ed5da6d8118,
+   0xd807aa98a3030242, 0x12835b0145706fbe, 0x243185be4ee4b28c, 0x550c7dc3d5ffb4e2,
+   0x72be5d74f27b896f, 0x80deb1fe3b1696b1, 0x9bdc06a725c71235, 0xc19bf174cf692694,
+   0xe49b69c19ef14ad2, 0xefbe4786384f25e3, 0x0fc19dc68b8cd5b5, 0x240ca1cc77ac9c65,
+   0x2de92c6f592b0275, 0x4a7484aa6ea6e483, 0x5cb0a9dcbd41fbd4, 0x76f988da831153b5,
+   0x983e5152ee66dfab, 0xa831c66d2db43210, 0xb00327c898fb213f, 0xbf597fc7beef0ee4,
+   0xc6e00bf33da88fc2, 0xd5a79147930aa725, 0x06ca6351e003826f, 0x142929670a0e6e70,
+   0x27b70a8546d22ffc, 0x2e1b21385c26c926, 0x4d2c6dfc5ac42aed, 0x53380d139d95b3df,
+   0x650a73548baf63de, 0x766a0abb3c77b2a8, 0x81c2c92e47edaee6, 0x92722c851482353b,
+   0xa2bfe8a14cf10364, 0xa81a664bbc423001, 0xc24b8b70d0f89791, 0xc76c51a30654be30,
+   0xd192e819d6ef5218, 0xd69906245565a910, 0xf40e35855771202a, 0x106aa07032bbd1b8,
+   0x19a4c116b8d2d0c8, 0x1e376c085141ab53, 0x2748774cdf8eeb99, 0x34b0bcb5e19b48a8,
+   0x391c0cb3c5c95a63, 0x4ed8aa4ae3418acb, 0x5b9cca4f7763e373, 0x682e6ff3d6b2b8a3,
+   0x748f82ee5defb2fc, 0x78a5636f43172f60, 0x84c87814a1f0ab72, 0x8cc702081a6439ec,
+   0x90befffa23631e28, 0xa4506cebde82bde9, 0xbef9a3f7b2c67915, 0xc67178f2e372532b,
+   0xca273eceea26619c, 0xd186b8c721c0c207, 0xeada7dd6cde0eb1e, 0xf57d4f7fee6ed178,
+   0x06f067aa72176fba, 0x0a637dc5a2c898a6, 0x113f9804bef90dae, 0x1b710b35131c471b,
+   0x28db77f523047d84, 0x32caab7b40c72493, 0x3c9ebe0a15c9bebc, 0x431d67c49c100d4c,
+   0x4cc5d4becb3e42b6, 0x597f299cfc657e2a, 0x5fcb6fab3ad6faec, 0x6c44198c4a475817
+};
+
+static const uint64_t H[] =
+{
+    // SHA-384
+    0xcbbb9d5dc1059ed8, 0x629a292a367cd507, 0x9159015a3070dd17, 0x152fecd8f70e5939,
+    0x67332667ffc00b31, 0x8eb44a8768581511, 0xdb0c2e0d64f98fa7, 0x47b5481dbefa4fa4,
+
+    // SHA-512
+    0x6a09e667f3bcc908, 0xbb67ae8584caa73b, 0x3c6ef372fe94f82b, 0xa54ff53a5f1d36f1,
+    0x510e527fade682d1, 0x9b05688c2b3e6c1f, 0x1f83d9abfb41bd6b, 0x5be0cd19137e2179
+};
+
+static uint64_t revWord(uint64_t w)
+{
+    uint8_t buffer[8];
+    buffer[0] = w >> 56;
+    buffer[1] = w >> 48;
+    buffer[2] = w >> 40;
+    buffer[3] = w >> 32;
+    buffer[4] = w >> 24;
+    buffer[5] = w >> 16;
+    buffer[6] = w >> 8;
+    buffer[7] = w;
+    
+    uint64_t res = buffer[7];
+    res <<= 8;
+    res |= buffer[6];
+    res <<= 8;
+    res |= buffer[5];
+    res <<= 8;
+    res |= buffer[4];
+    res <<= 8;
+    res |= buffer[3];
+    res <<= 8;
+    res |= buffer[2];
+    res <<= 8;
+    res |= buffer[1];
+    res <<= 8;
+    res |= buffer[0];
+
+    return res;
+}
+    
+static uint64_t rotLeft(uint64_t w, uint8_t n)
+{
+    return (w << n) | (w >> (64-n));
+}
+
+static uint64_t rotRight(uint64_t w, uint8_t n)
+{
+    return rotLeft(w,64-n);
+}
+
+static uint64_t CH(uint64_t x, uint64_t y, uint64_t z)
+{
+    return (x & y) ^ ((~x) & z);
+}
+
+static uint64_t MAJ(uint64_t x, uint64_t y, uint64_t z)
+{
+    return (x & y) ^ (x & z) ^ (y & z);
+}
+
+static uint64_t BSIG0(uint64_t x)
+{
+    return rotRight(x,28) ^ rotRight(x,34) ^ rotRight(x,39);
+}
+
+static uint64_t BSIG1(uint64_t x)
+{
+    return rotRight(x,14) ^ rotRight(x,18) ^ rotRight(x,41);
+}
+
+static uint64_t SSIG0(uint64_t x)
+{
+    return rotRight(x,1) ^ rotRight(x,8) ^ (x >> 7);
+}
+
+static uint64_t SSIG1(uint64_t x)
+{
+    return rotRight(x,19) ^ rotRight(x,61) ^ (x>>6);
+}
+
+SHA2_64::SHA2_64(SHA2_64_TYPE t):
+type(t),
+totalBufferLength(0),
+bufferLength(0)
+{
+    switch(type)
+    {
+        case SHA_384:
+            h0 = H[0];
+            h1 = H[1];
+            h2 = H[2];
+            h3 = H[3];
+            h4 = H[4];
+            h5 = H[5];
+            h6 = H[6];
+            h7 = H[7];
+        break;
+        
+        case SHA_512:
+            h0 = H[8];
+            h1 = H[9];
+            h2 = H[10];
+            h3 = H[11];
+            h4 = H[12];
+            h5 = H[13];
+            h6 = H[14];
+            h7 = H[15];     
+        break;
+    }
+}
+
+void SHA2_64::add(uint8_t *in, uint32_t length)
+{
+    if(length < 128-bufferLength)
+    {
+        memcpy(&buffer[bufferLength], in, length);
+        bufferLength += length;
+        totalBufferLength += length;
+        return;
+    }
+    int offset = 128-bufferLength;
+    memcpy(&buffer[bufferLength], in, offset);
+    computeBlock(&h0,&h1,&h2,&h3,&h4,&h5,&h6,&h7,buffer);
+    while(length-offset > 128)
+    {
+        memcpy(buffer, &in[offset], 128);
+        computeBlock(&h0,&h1,&h2,&h3,&h4,&h5,&h6,&h7,buffer);
+        offset += 128;
+    }
+    if(offset > length)
+        offset -= 128;
+    bufferLength = length - offset;
+    memcpy(buffer, &in[offset], bufferLength);
+    totalBufferLength += length;
+}
+
+void SHA2_64::computeDigest(uint8_t *digest)
+{
+    uint16_t padding;
+    if(totalBufferLength % 128 < 112)
+        padding = 112 - (totalBufferLength % 128);
+    else
+        padding = 112 + (128 - (totalBufferLength % 128));
+    uint8_t val = 0x80;
+    add(&val, 1);
+    val = 0;
+    for(int i = 0; i < padding-1; ++i)
+        add(&val,1);
+    totalBufferLength -= padding;
+    uint64_t lengthBit = 0;
+    add((uint8_t*)&lengthBit, 8);
+    lengthBit = (totalBufferLength - 8) * 8;
+    lengthBit = revWord(lengthBit);
+    add((uint8_t*)&lengthBit, 8);
+
+    h0 = revWord(h0);
+    h1 = revWord(h1);
+    h2 = revWord(h2);
+    h3 = revWord(h3);
+    h4 = revWord(h4);
+    h5 = revWord(h5);
+
+    
+    memcpy(digest, &h0, 8);
+    memcpy(&digest[8], &h1, 8);
+    memcpy(&digest[16], &h2, 8);
+    memcpy(&digest[24], &h3, 8);
+    memcpy(&digest[32], &h4, 8);
+    memcpy(&digest[40], &h5, 8);
+
+    if(type == SHA_512)
+    {
+        h6 = revWord(h6);
+        h7 = revWord(h7);
+        memcpy(&digest[48], &h6, 8);
+        memcpy(&digest[56], &h7, 8);
+    }
+    
+    // reset state
+    switch(type)
+    {
+        case SHA_384:
+            h0 = H[0];
+            h1 = H[1];
+            h2 = H[2];
+            h3 = H[3];
+            h4 = H[4];
+            h5 = H[5];
+            h6 = H[6];
+            h7 = H[7];
+        break;
+        
+        case SHA_512:
+            h0 = H[8];
+            h1 = H[9];
+            h2 = H[10];
+            h3 = H[11];
+            h4 = H[12];
+            h5 = H[13];
+            h6 = H[14];
+            h7 = H[15];     
+        break;
+    }
+    totalBufferLength = 0;
+    bufferLength = 0;
+}
+
+void SHA2_64::computeBlock(uint64_t *h02, 
+                     uint64_t *h12, 
+                     uint64_t *h22, 
+                     uint64_t *h32, 
+                     uint64_t *h42, 
+                     uint64_t *h52, 
+                     uint64_t *h62,
+                     uint64_t *h72,
+                     uint8_t *buffer)
+{
+    uint64_t w[80];
+    for(int t = 0; t < 16; ++t) 
+    {
+        memcpy(&w[t], &buffer[t*8], 8);
+        w[t] = revWord(w[t]);
+    }
+    for(int t = 16; t < 80; ++t)
+        w[t] = SSIG1(w[t-2]) + w[t-7] + SSIG0(w[t-15]) + w[t-16];
+    
+    uint64_t a = *h02, b = *h12, c = *h22, d = *h32, e = *h42, f = *h52, g = *h62, h = *h72;
+    for(int t = 0; t < 80; ++t)
+    {
+        uint64_t T1 = h + BSIG1(e) + CH(e,f,g) + K[t] + w[t];
+        uint64_t T2 = BSIG0(a) + MAJ(a,b,c);
+        h = g;
+        g = f;
+        f = e;
+        e = d + T1;
+        d = c;
+        c = b;
+        b = a;
+        a = T1 + T2;
+    }
+    *h02 += a;
+    *h12 += b;
+    *h22 += c;
+    *h32 += d;
+    *h42 += e;
+    *h52 += f;
+    *h62 += g;
+    *h72 += h;
+}
+
+void SHA2_64::computeDigest(SHA2_64_TYPE type, uint8_t *digest, uint8_t *in, uint32_t length)
+{
+    uint64_t h0 = H[type*8], h1 = H[type*8+1], h2 = H[type*8+2], h3 = H[type*8+3];
+    uint64_t h4 = H[type*8+4], h5 = H[type*8+5], h6 = H[type*8+6], h7 = H[type*8+7];
+    int offset = 0;
+    while(length - offset >= 128)
+    {
+        computeBlock(&h0, &h1, &h2, &h3, &h4, &h5, &h6, &h7, &in[offset]);
+        offset += 128;
+    }
+    uint8_t bufferLength = length-offset;
+    uint8_t buffer[128];
+    memcpy(buffer, &in[offset],bufferLength); 
+    uint16_t padding;
+    if(length % 128 < 112)
+        padding = 112 - (length % 128);
+    else
+        padding = 112 + (128 - (length % 128));
+    buffer[bufferLength] = 0x80;
+    bufferLength++;
+    padding--;
+    while(padding > 0)
+    {
+        if(bufferLength == 128)
+        {
+            computeBlock(&h0, &h1, &h2, &h3, &h4, &h5, &h6, &h7, buffer);
+            bufferLength = 0;
+        }
+        buffer[bufferLength] = 0;
+        bufferLength++;
+        padding--;
+    }
+    uint64_t lengthBit = length * 8;
+    lengthBit = revWord(lengthBit);
+    memset(&buffer[112], 0, 8); 
+    memcpy(&buffer[120], &lengthBit, 8);
+    computeBlock(&h0, &h1, &h2, &h3, &h4, &h5, &h6, &h7, buffer);
+
+    h0 = revWord(h0);
+    h1 = revWord(h1);
+    h2 = revWord(h2);
+    h3 = revWord(h3);
+    h4 = revWord(h4);
+    h5 = revWord(h5);
+
+    
+    memcpy(digest, &h0, 8);
+    memcpy(&digest[8], &h1, 8);
+    memcpy(&digest[16], &h2, 8);
+    memcpy(&digest[24], &h3, 8);
+    memcpy(&digest[32], &h4, 8);
+    memcpy(&digest[40], &h5, 8);
+
+    if(type == SHA_512)
+    {
+        h6 = revWord(h6);
+        h7 = revWord(h7);
+        memcpy(&digest[48], &h6, 8);
+        memcpy(&digest[56], &h7, 8);
+    }
+}
+