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//
// Copyright (c) 2010-2018 Antmicro
// Copyright (c) 2011-2015 Realtime Embedded
//
// This file is licensed under the MIT License.
// Full license text is available in 'licenses/MIT.txt'.
//
using System;
using System.Collections.Generic;
using System.Linq;

namespace Antmicro.Renode.Peripherals.Miscellaneous.Betrusted
{
using System;
using System.Security.Cryptography;
using Antmicro.Renode.Core;
using Antmicro.Renode.Core.Structure.Registers;
using Antmicro.Renode.Logging;
using Antmicro.Renode.Peripherals.Bus;
public class Sha512Writer : IDoubleWordPeripheral, IBytePeripheral, IProvidesRegisterCollection<DoubleWordRegisterCollection>, IKnownSize
{
public Sha512Writer(Machine machine, Sha512 sha512)
{
this.machine = machine;
this.sha512 = sha512;
}

private Machine machine;
private Sha512 sha512;
public long Size { get { return 4096; } }

public void WriteDoubleWord(long offset, uint value)
{
if (offset != 0)
{
this.Log(LogLevel.Error, "Adding word 0x{0:X} (at address 0x{1:X}) to hash", value, offset);
}
this.sha512.add32ToHash(value, (uint)offset);
}

public uint ReadDoubleWord(long offset)
{
return RegistersCollection.Read(offset);
}

public byte ReadByte(long offset)
{
this.Log(LogLevel.Error, "Reading byte from 0x{0:X}", offset);
return 0;
}

public void WriteByte(long offset, byte value)
{
this.Log(LogLevel.Error, "Writing byte value 0x{0:X} to 0x{0:X}", value, offset);
this.sha512.add8ToHash(value, (uint)offset);
}

public DoubleWordRegisterCollection RegistersCollection { get; private set; }

public void Reset()
{
}

}
public class Sha512 : IDoubleWordPeripheral, IProvidesRegisterCollection<DoubleWordRegisterCollection>, IKnownSize
{
public Sha512(Machine machine, uint memAddr, uint memSize)
{
this.machine = machine;
var sha512Writer = new Sha512Writer(machine, this);
machine.SystemBus.Register(sha512Writer, new BusRangeRegistration(memAddr, memSize));

RegistersCollection = new DoubleWordRegisterCollection(this);
this.IRQ = new GPIO();
this.sha512 = new SHA512Managed();
Reset();
DefineRegisters();
}

public void add32ToHash(UInt32 encounteredValue, uint address)
{
var inputBuffer = new byte[4];
if (!this.inputIsSwapped.Value)
{
inputBuffer[3] = (byte)(encounteredValue >> 0);
inputBuffer[2] = (byte)(encounteredValue >> 8);
inputBuffer[1] = (byte)(encounteredValue >> 16);
inputBuffer[0] = (byte)(encounteredValue >> 24);
}
else
{
inputBuffer[0] = (byte)(encounteredValue >> 0);
inputBuffer[1] = (byte)(encounteredValue >> 8);
inputBuffer[2] = (byte)(encounteredValue >> 16);
inputBuffer[3] = (byte)(encounteredValue >> 24);
}
if (this.usingSha256.Value)
{
foreach (byte b in inputBuffer)
{
this.Sha512_256Backing.Add(b);
}
}
else
{
this.sha512.TransformBlock(inputBuffer, 0, inputBuffer.Length, null, 0);
}
this.digestedLength += (ulong)inputBuffer.Length * 8;
}

public void add8ToHash(byte encounteredValue, uint address)
{
var inputBuffer = new byte[1];
inputBuffer[0] = encounteredValue;
if (this.usingSha256.Value)
{
this.Sha512_256Backing.Add(inputBuffer[0]);
}
else
{
this.sha512.TransformBlock(inputBuffer, 0, inputBuffer.Length, null, 0);
}
this.digestedLength += (ulong)inputBuffer.Length * 8;
}

private uint ResultAtOffset(int offset)
{
// this.Log(LogLevel.Error, "Hash is: {0} Offset[{1}]: 0x{2:X}", this.sha512, offset, this.sha512.Hash[offset + 0]);
if (usingSha256.Value && offset >= 32)
{
offset -= 32;
}

// Using sha 512
var arr = this.sha512.Hash;
if (this.usingSha256.Value && (this.Sha512_256Result != null))
{
arr = this.Sha512_256Result.Hash;
}

if (outputIsSwapped.Value)
{
return ((uint)arr[offset + 0] << 0)
| ((uint)arr[offset + 1] << 8)
| ((uint)arr[offset + 2] << 16)
| ((uint)arr[offset + 3] << 24);
}
else
{
return ((uint)arr[offset + 3] << 0)
| ((uint)arr[offset + 2] << 8)
| ((uint)arr[offset + 1] << 16)
| ((uint)arr[offset + 0] << 24);
}
}

private void DefineRegisters()
{
Registers.POWER.Define(this)
.WithFlag(0, out powerIsOn, FieldMode.Read | FieldMode.Write, name: "ON")
;

Registers.CONFIG.Define(this)
.WithFlag(0, out shaIsEnabled, FieldMode.Read | FieldMode.Write, name: "SHA_EN")
.WithFlag(1, out inputIsSwapped, FieldMode.Read | FieldMode.Write, name: "ENDIAN_SWAP")
.WithFlag(2, out outputIsSwapped, FieldMode.Read | FieldMode.Write, name: "DIGEST_SWAP")
.WithFlag(3, out usingSha256, FieldMode.Read | FieldMode.Write, name: "SELECT_256")
.WithFlag(4, FieldMode.Write, name: "RESET", writeCallback: (_, doit) => { if (doit) Reset(); })
;

Registers.COMMAND.Define(this)
.WithFlag(0, name: "HASH_START", writeCallback: (_, value) =>
{
if (value)
{
if (this.usingSha256.Value)
{
// this.sha512 = SHA512Managed.Create("SHA512/256");
this.Sha512_256Backing = new List<byte>();
this.Sha512_256Result = null;
}
else
{
this.sha512 = SHA512Managed.Create("SHA512");
this.sha512.Initialize();
}
this.digestedLength = 0;
}
})
.WithFlag(1, name: "HASH_PROCESS", writeCallback: (_, value) =>
{
if (value)
{
if (this.usingSha256.Value)
{
this.Sha512_256Result = new SHA512_256Managed(this.Sha512_256Backing.ToArray());
this.Sha512_256Backing = null;
}
else
{
var dummy = new byte[0];
this.sha512.TransformFinalBlock(dummy, 0, 0);
}

sha512DoneStatus = true;
UpdateInterrupts();
sha512DoneStatus = false;
}
})
;

Registers.DIGEST00.Define(this)
.WithValueField(0, 32, valueProviderCallback: _ => ResultAtOffset(0))
;
Registers.DIGEST01.Define(this)
.WithValueField(0, 32, valueProviderCallback: _ => ResultAtOffset(4))
;
Registers.DIGEST10.Define(this)
.WithValueField(0, 32, valueProviderCallback: _ => ResultAtOffset(8))
;
Registers.DIGEST11.Define(this)
.WithValueField(0, 32, valueProviderCallback: _ => ResultAtOffset(12))
;
Registers.DIGEST20.Define(this)
.WithValueField(0, 32, valueProviderCallback: _ => ResultAtOffset(16))
;
Registers.DIGEST21.Define(this)
.WithValueField(0, 32, valueProviderCallback: _ => ResultAtOffset(20))
;
Registers.DIGEST30.Define(this)
.WithValueField(0, 32, valueProviderCallback: _ => ResultAtOffset(24))
;
Registers.DIGEST31.Define(this)
.WithValueField(0, 32, valueProviderCallback: _ => ResultAtOffset(28))
;
Registers.DIGEST40.Define(this)
.WithValueField(0, 32, valueProviderCallback: _ => ResultAtOffset(32))
;
Registers.DIGEST41.Define(this)
.WithValueField(0, 32, valueProviderCallback: _ => ResultAtOffset(36))
;
Registers.DIGEST50.Define(this)
.WithValueField(0, 32, valueProviderCallback: _ => ResultAtOffset(40))
;
Registers.DIGEST51.Define(this)
.WithValueField(0, 32, valueProviderCallback: _ => ResultAtOffset(44))
;
Registers.DIGEST60.Define(this)
.WithValueField(0, 32, valueProviderCallback: _ => ResultAtOffset(48))
;
Registers.DIGEST61.Define(this)
.WithValueField(0, 32, valueProviderCallback: _ => ResultAtOffset(52))
;
Registers.DIGEST70.Define(this)
.WithValueField(0, 32, valueProviderCallback: _ => ResultAtOffset(56))
;
Registers.DIGEST71.Define(this)
.WithValueField(0, 32, valueProviderCallback: _ => ResultAtOffset(60))
;
Registers.MSG_LENGTH1.Define(this)
.WithValueField(0, 32, valueProviderCallback: _ => (uint)(this.digestedLength >> 32))
;
Registers.MSG_LENGTH0.Define(this)
.WithValueField(0, 32, valueProviderCallback: _ => (uint)this.digestedLength)
;

Registers.EV_STATUS.Define32(this)
.WithFlag(0, FieldMode.Read, name: "ERR_VALID", valueProviderCallback: _ => errValidStatus)
.WithFlag(1, FieldMode.Read, name: "FIFO_FULL", valueProviderCallback: _ => fifoFullStatus)
.WithFlag(2, FieldMode.Read, name: "SHA512_DONE", valueProviderCallback: _ => sha512DoneStatus)
;

Registers.EV_PENDING.Define32(this)
.WithFlag(0, out errValidPending, FieldMode.Read | FieldMode.WriteOneToClear, name: "ERR_VALID", changeCallback: (_, __) => UpdateInterrupts())
.WithFlag(1, out fifoFullPending, FieldMode.Read | FieldMode.WriteOneToClear, name: "FIFO_FULL", changeCallback: (_, __) => UpdateInterrupts())
.WithFlag(2, out sha512DonePending, FieldMode.Read | FieldMode.WriteOneToClear, name: "SHA512_DONE", changeCallback: (_, __) => UpdateInterrupts())
;

Registers.EV_ENABLE.Define32(this)
.WithFlag(0, out errValidEnabled, name: "ERR_VALID", changeCallback: (_, __) => UpdateInterrupts())
.WithFlag(1, out fifoFullEnabled, name: "FIFO_FULL", changeCallback: (_, __) => UpdateInterrupts())
.WithFlag(2, out sha512DoneEnabled, name: "SHA512_DONE", changeCallback: (_, __) => UpdateInterrupts())
;

Registers.FIFO.Define(this)
.WithValueField(0, 32, valueProviderCallback: _ => 0)
;
}

private void UpdateInterrupts()
{
if (this.errValidStatus)
{
this.errValidPending.Value = true;
}
if (this.fifoFullStatus)
{
this.fifoFullPending.Value = true;
}
if (this.sha512DoneStatus)
{
this.sha512DonePending.Value = true;
}
IRQ.Set((this.errValidPending.Value && this.errValidEnabled.Value)
|| (this.fifoFullPending.Value && this.fifoFullEnabled.Value)
|| (this.sha512DonePending.Value && this.sha512DoneEnabled.Value));
}

public void WriteDoubleWord(long address, uint value)
{
RegistersCollection.Write(address, value);
}

public uint ReadDoubleWord(long offset)
{
return RegistersCollection.Read(offset);
}

public long Size { get { return 4096; } }
public DoubleWordRegisterCollection RegistersCollection { get; private set; }

public void Reset()
{
this.sha512.Initialize();
this.digestedLength = 0;
RegistersCollection.Reset();
}

private readonly Machine machine;

private SHA512 sha512;
public GPIO IRQ { get; private set; }

private List<byte> Sha512_256Backing;
private SHA512_256Managed Sha512_256Result;

private IFlagRegisterField powerIsOn;
private IFlagRegisterField shaIsEnabled;
private IFlagRegisterField inputIsSwapped;
private IFlagRegisterField outputIsSwapped;
private IFlagRegisterField usingSha256;

private IFlagRegisterField errValidEnabled;
private IFlagRegisterField errValidPending;
private bool errValidStatus;

private IFlagRegisterField fifoFullEnabled;
private IFlagRegisterField fifoFullPending;
private bool fifoFullStatus;

private IFlagRegisterField sha512DoneEnabled;
private IFlagRegisterField sha512DonePending;
private bool sha512DoneStatus;

private UInt64 digestedLength;
private enum Registers
{
POWER = 0x00,
CONFIG = 0x04,
COMMAND = 0x08,
DIGEST01 = 0x0c,
DIGEST00 = 0x10,
DIGEST11 = 0x14,
DIGEST10 = 0x18,
DIGEST21 = 0x1c,
DIGEST20 = 0x20,
DIGEST31 = 0x24,
DIGEST30 = 0x28,
DIGEST41 = 0x2c,
DIGEST40 = 0x30,
DIGEST51 = 0x34,
DIGEST50 = 0x38,
DIGEST61 = 0x3c,
DIGEST60 = 0x40,
DIGEST71 = 0x44,
DIGEST70 = 0x48,
MSG_LENGTH1 = 0x4c,
MSG_LENGTH0 = 0x50,
EV_STATUS = 0x54,
EV_PENDING = 0x58,
EV_ENABLE = 0x5c,
FIFO = 0x60
}
}
}

namespace Antmicro.Renode.Peripherals.Miscellaneous
{
using System.Globalization;
using System.Diagnostics.Contracts;
using System.Security.Cryptography;
using Antmicro.Renode.Core;
using Antmicro.Renode.Core.Structure.Registers;
using Antmicro.Renode.Logging;
using Antmicro.Renode.Peripherals.Bus;
}
public class SHA512_256Managed
{
UInt64[] H0Sha512_256;
UInt64[] K512;
public byte[] Hash;

//
// public constructors
//

public SHA512_256Managed(byte[] plaintext)
{
// These eight 64-bit words are obtained from GenerateInitialHashSha512t(256)
// They are manually added to the array here due to bugs in the Renode C# parser. Attemtping
// to use a normal array will give an error such as:
// (SoC) i @peripherals/sha512.cs
// Errors during compilation or loading:
// Could not compile assembly: D:\\Code\\Xous\\Core\\emulation\\peripherals\\sha512.cs(407,5):
// 14:56:16.2452 [INFO] Including script: D:\\Code\\Xous\\Core\\emulation\\peripherals\\sha512.cs (2)
// (SoC)
this.H0Sha512_256 = new UInt64[8];
this.H0Sha512_256[0] = 0x22312194fc2bf72c;
this.H0Sha512_256[1] = 0x9f555fa3c84c64c2;
this.H0Sha512_256[2] = 0x2393b86b6f53b151;
this.H0Sha512_256[3] = 0x963877195940eabd;
this.H0Sha512_256[4] = 0x96283ee2a88effe3;
this.H0Sha512_256[5] = 0xbe5e1e2553863992;
this.H0Sha512_256[6] = 0x2b0199fc2c85b8aa;
this.H0Sha512_256[7] = 0x0eb72ddc81c52ca2;
// The eighty 64-bit words in the array K512 are used in Sha-384, Sha-512, Sha-512/224, Sha-512/256.
// They are obtained by taking the first 64 bits of the fractional
// parts of the cube roots of the first eighty primes.
// They are manually added to the array here due to bugs in the Renode C# parser.
this.K512 = new UInt64[80];
this.K512[0] = 0x428a2f98d728ae22;
this.K512[1] = 0x7137449123ef65cd;
this.K512[2] = 0xb5c0fbcfec4d3b2f;
this.K512[3] = 0xe9b5dba58189dbbc;
this.K512[4] = 0x3956c25bf348b538;
this.K512[5] = 0x59f111f1b605d019;
this.K512[6] = 0x923f82a4af194f9b;
this.K512[7] = 0xab1c5ed5da6d8118;
this.K512[8] = 0xd807aa98a3030242;
this.K512[9] = 0x12835b0145706fbe;
this.K512[10] = 0x243185be4ee4b28c;
this.K512[11] = 0x550c7dc3d5ffb4e2;
this.K512[12] = 0x72be5d74f27b896f;
this.K512[13] = 0x80deb1fe3b1696b1;
this.K512[14] = 0x9bdc06a725c71235;
this.K512[15] = 0xc19bf174cf692694;
this.K512[16] = 0xe49b69c19ef14ad2;
this.K512[17] = 0xefbe4786384f25e3;
this.K512[18] = 0x0fc19dc68b8cd5b5;
this.K512[19] = 0x240ca1cc77ac9c65;
this.K512[20] = 0x2de92c6f592b0275;
this.K512[21] = 0x4a7484aa6ea6e483;
this.K512[22] = 0x5cb0a9dcbd41fbd4;
this.K512[23] = 0x76f988da831153b5;
this.K512[24] = 0x983e5152ee66dfab;
this.K512[25] = 0xa831c66d2db43210;
this.K512[26] = 0xb00327c898fb213f;
this.K512[27] = 0xbf597fc7beef0ee4;
this.K512[28] = 0xc6e00bf33da88fc2;
this.K512[29] = 0xd5a79147930aa725;
this.K512[30] = 0x06ca6351e003826f;
this.K512[31] = 0x142929670a0e6e70;
this.K512[32] = 0x27b70a8546d22ffc;
this.K512[33] = 0x2e1b21385c26c926;
this.K512[34] = 0x4d2c6dfc5ac42aed;
this.K512[35] = 0x53380d139d95b3df;
this.K512[36] = 0x650a73548baf63de;
this.K512[37] = 0x766a0abb3c77b2a8;
this.K512[38] = 0x81c2c92e47edaee6;
this.K512[39] = 0x92722c851482353b;
this.K512[40] = 0xa2bfe8a14cf10364;
this.K512[41] = 0xa81a664bbc423001;
this.K512[42] = 0xc24b8b70d0f89791;
this.K512[43] = 0xc76c51a30654be30;
this.K512[44] = 0xd192e819d6ef5218;
this.K512[45] = 0xd69906245565a910;
this.K512[46] = 0xf40e35855771202a;
this.K512[47] = 0x106aa07032bbd1b8;
this.K512[48] = 0x19a4c116b8d2d0c8;
this.K512[49] = 0x1e376c085141ab53;
this.K512[50] = 0x2748774cdf8eeb99;
this.K512[51] = 0x34b0bcb5e19b48a8;
this.K512[52] = 0x391c0cb3c5c95a63;
this.K512[53] = 0x4ed8aa4ae3418acb;
this.K512[54] = 0x5b9cca4f7763e373;
this.K512[55] = 0x682e6ff3d6b2b8a3;
this.K512[56] = 0x748f82ee5defb2fc;
this.K512[57] = 0x78a5636f43172f60;
this.K512[58] = 0x84c87814a1f0ab72;
this.K512[59] = 0x8cc702081a6439ec;
this.K512[60] = 0x90befffa23631e28;
this.K512[61] = 0xa4506cebde82bde9;
this.K512[62] = 0xbef9a3f7b2c67915;
this.K512[63] = 0xc67178f2e372532b;
this.K512[64] = 0xca273eceea26619c;
this.K512[65] = 0xd186b8c721c0c207;
this.K512[66] = 0xeada7dd6cde0eb1e;
this.K512[67] = 0xf57d4f7fee6ed178;
this.K512[68] = 0x06f067aa72176fba;
this.K512[69] = 0x0a637dc5a2c898a6;
this.K512[70] = 0x113f9804bef90dae;
this.K512[71] = 0x1b710b35131c471b;
this.K512[72] = 0x28db77f523047d84;
this.K512[73] = 0x32caab7b40c72493;
this.K512[74] = 0x3c9ebe0a15c9bebc;
this.K512[75] = 0x431d67c49c100d4c;
this.K512[76] = 0x4cc5d4becb3e42b6;
this.K512[77] = 0x597f299cfc657e2a;
this.K512[78] = 0x5fcb6fab3ad6faec;
this.K512[79] = 0x6c44198c4a475817;
this.Hash = Sha512Algorithm(plaintext, this.H0Sha512_256, 256);
}

byte[] Sha512Algorithm(byte[] plaintext, UInt64[] H0, int numberBits)
{
Block1024[] blocks = ConvertPaddedMessageToBlock1024Array(PadPlainText1024(plaintext));

// Define the hash variable and set its initial values.
UInt64[] H = H0;

for (int i = 0; i < blocks.Length; i++)
{
UInt64[] W = CreateMessageScheduleSha512(blocks[i]);

// Set the working variables a,...,h to the current hash values.
UInt64 a = H[0];
UInt64 b = H[1];
UInt64 c = H[2];
UInt64 d = H[3];
UInt64 e = H[4];
UInt64 f = H[5];
UInt64 g = H[6];
UInt64 h = H[7];

for (int t = 0; t < 80; t++)
{
UInt64 T1 = h + Sigma1_512(e) + Ch(e, f, g) + this.K512[t] + W[t];
UInt64 T2 = Sigma0_512(a) + Maj(a, b, c);
h = g;
g = f;
f = e;
e = d + T1;
d = c;
c = b;
b = a;
a = T1 + T2;
}

// Update the current value of the hash H after processing block i.
H[0] += a;
H[1] += b;
H[2] += c;
H[3] += d;
H[4] += e;
H[5] += f;
H[6] += g;
H[7] += h;
}

// Concatenate all the Word64 Hash Values
byte[] hash = ShaUtilities.Word64ArrayToByteArray(H);

// The number of bytes in the final output hash
int numberBytes = numberBits / 8;
byte[] truncatedHash = new byte[numberBytes];
Array.Copy(hash, truncatedHash, numberBytes);

return truncatedHash;
}


static UInt32 Maj(UInt32 x, UInt32 y, UInt32 z)
{
return (x & y) ^ (x & z) ^ (y & z);
}

static UInt64 Maj(UInt64 x, UInt64 y, UInt64 z)
{
return (x & y) ^ (x & z) ^ (y & z);
}

static UInt32 Ch(UInt32 x, UInt32 y, UInt32 z)
{
return (x & y) ^ (~x & z);
}

static UInt64 Ch(UInt64 x, UInt64 y, UInt64 z)
{
return (x & y) ^ (~x & z);
}

static UInt64 Sigma0_512(UInt64 x)
{
return RotR(28, x) ^ RotR(34, x) ^ RotR(39, x);
}

static UInt64 Sigma1_512(UInt64 x)
{
return RotR(14, x) ^ RotR(18, x) ^ RotR(41, x);
}

static UInt64 sigma0_512(UInt64 x)
{
return RotR(1, x) ^ RotR(8, x) ^ ShR(7, x);
}

static UInt64 sigma1_512(UInt64 x)
{
return RotR(19, x) ^ RotR(61, x) ^ ShR(6, x);
}


static UInt64 ShR(int n, UInt64 x)
{
// should have 0 <= n < 64
return (x >> n);
}
static UInt32 RotR(int n, UInt32 x)
{
// should have 0 <= n < 32
return (x >> n) | (x << 32 - n);
}

static UInt64 RotR(int n, UInt64 x)
{
// should have 0 <= n < 64
return (x >> n) | (x << 64 - n);
}
static byte[] PadPlainText1024(byte[] plaintext)
{
// After padding the total bits of the output will be divisible by 1024.
int numberBits = plaintext.Length * 8;
int t = (numberBits + 8 + 128) / 1024;

// Note that 1024 * (t + 1) is the least multiple of 1024 greater than (numberBits + 8 + 128)
// Therefore the number of zero bits we need to add is
int k = 1024 * (t + 1) - (numberBits + 8 + 128);

// Since numberBits % 8 = 0, we know k % 8 = 0. So n = k / 8 is the number of zero bytes to add.
int n = k / 8;

List<byte> paddedtext = plaintext.ToList();

// Start the padding by concatenating 1000_0000 = 0x80 = 128
paddedtext.Add(0x80);

// Next add n zero bytes
for (int i = 0; i < n; i++)
{
paddedtext.Add(0);
}

// Now add 16 bytes (128 bits) to represent the length of the message in bits.
// C# does not have 128 bit integer.
// For now just add 8 zero bytes and then 8 bytes to represent the int
for (int i = 0; i < 8; i++)
{
paddedtext.Add(0);
}

byte[] B = BitConverter.GetBytes((ulong)numberBits);
Array.Reverse(B);

for (int i = 0; i < B.Length; i++)
{
paddedtext.Add(B[i]);
}

return paddedtext.ToArray();
}

static Block1024[] ConvertPaddedMessageToBlock1024Array(byte[] M)
{
// We are assuming M is padded, so the number of bits in M is divisible by 1024
int numberBlocks = (M.Length * 8) / 1024; // same as: M.Length / 128
Block1024[] blocks = new Block1024[numberBlocks];

for (int i = 0; i < numberBlocks; i++)
{
// First extract the relavant subarray from M
byte[] B = new byte[128]; // 128 * 8 = 1024

for (int j = 0; j < 128; j++)
{
B[j] = M[i * 128 + j];
}

UInt64[] words = ShaUtilities.ByteArrayToWord64Array(B);
blocks[i] = new Block1024(words);
}

return blocks;
}

static UInt64[] CreateMessageScheduleSha512(Block1024 block)
{
// The message schedule.
UInt64[] W = new UInt64[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] = sigma1_512(W[t - 2]) + W[t - 7] + sigma0_512(W[t - 15]) + W[t - 16];
}
}

return W;
}

class Block1024
{
// A Block1024 consists of an array of 16 elements of type Word64.
public UInt64[] words;

public Block1024(UInt64[] words)
{
if (words.Length == 16)
{
this.words = words;
}
else
{
Console.WriteLine("ERROR: A block must be 16 words");
this.words = null;
}
}
}

static class ShaUtilities
{
public static UInt64[] ByteArrayToWord64Array(byte[] B)
{
// We assume B is not null, is not empty and number elements is divisible by 8
int numberWords = B.Length / 8; // 8 bytes for each Word32
UInt64[] word64Array = new UInt64[numberWords];

for (int i = 0; i < numberWords; i++)
{
word64Array[i] = ByteArrayToWord64(B, 8 * i);
}

return word64Array;
}


public static UInt64 ByteArrayToWord64(byte[] B, int startIndex)
{
// We assume: 0 <= startIndex < B. Length, and startIndex + 8 <= B.Length
UInt64 c = 256;
UInt64 output = 0;

for (int i = startIndex; i < startIndex + 8; i++)
{
output = output * c + B[i];
}

return output;
}

// Returns an array of 8 bytes.
public static byte[] Word64ToByteArray(UInt64 x)
{
byte[] b = BitConverter.GetBytes(x);
Array.Reverse(b);
return b;
}
public static byte[] Word64ArrayToByteArray(UInt64[] words)
{
List<byte> b = new List<byte>();

for (int i = 0; i < words.Length; i++)
{
b.AddRange(Word64ToByteArray(words[i]));
}

return b.ToArray();
}

}
}

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