static Word32[] CreateMessageScheduleSha256(Block512 block)
{
// The message schedule.
Word32[] W = new Word32[64];
// Prepare the message schedule W.
// The first 16 words in W are the same as the words of the block.
// The remaining 64-16 = 48 words in W are functions of the previously defined words.
for (int t = 0; t < 64; t++)
{
if (t < 16)
{
W[t] = block.words[t];
}
else
{
W[t] = sigma1_256(W[t - 2]) + W[t - 7] + sigma0_256(W[t - 15]) + W[t - 16];
}
}
return(W);
}
static Word32[] CreateMessageScheduleSha1(Block512 block)
{
// The message schedule.
Word32[] W = new Word32[80];
// Prepare the message schedule W.
// The first 16 words in W are the same as the words of the block.
// The remaining 80-16 = 64 words in W are functions of the previously defined words.
for (int t = 0; t < 80; t++)
{
if (t < 16)
{
W[t] = block.words[t];
}
else
{
W[t] = RotL(1, W[t - 3] ^ W[t - 8] ^ W[t - 14] ^ W[t - 16]);
}
}
return(W);
}
static Block512[] ConvertPaddedTextToBlock512Array(byte[] paddedtext)
{
// We are assuming M has been padded, so the number of bits in M is divisible by 512
int numberBlocks = (paddedtext.Length * 8) / 512; // same as: paddedtext.Length / 64
Block512[] blocks = new Block512[numberBlocks];
for (int i = 0; i < numberBlocks; i++)
{
// First extract the relavant subarray from paddedtext
byte[] B = new byte[64]; // 64 * 8 = 512
for (int j = 0; j < 64; j++)
{
B[j] = paddedtext[i * 64 + j];
}
Word32[] words = ShaUtilities.ByteArrayToWord32Array(B);
blocks[i] = new Block512(words);
}
return(blocks);
}