PROJECT (FILE) STRUCTURE / DEPTH FIX

This commit is contained in:
xdrm-brackets 2018-04-25 08:06:27 +02:00
parent e2bef5963e
commit 3a77463614
18 changed files with 0 additions and 398 deletions

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@ -1,101 +0,0 @@
package scha
import (
"errors"
"crypto/sha512"
"git.xdrm.io/schastsp/pkg/xor"
)
/* (0) Static
---------------------------------------------------------*/
/* (1) Constants */
const HSIZE uint16 = sha512.Size;
const HBITSIZE uint32 = uint32(HSIZE) * 8;
/* (1) Basic hash function
*
* @input<[]byte> Byte array input
*
* @return digest<[]byte]> Byte array digest
*
---------------------------------------------------------*/
func hash(input []byte) []byte{
/* (1) Create sha512 hasher */
hasher := sha512.New();
/* (2) Defer memory cleanup */
defer hasher.Reset();
/* (3) Set input to be hashed */
hasher.Write(input);
/* (4) Extract digest */
return hasher.Sum(nil);
}
/* (2) Public hashing interface
*
* @input<[]byte> Byte array input
* @depth<uint> Number of time to hash recursively (must be > 1)
* @salt<[]byte> [OPT] Optional salt
* @pepper<[]byte> [OPT] Optional pepper
*
* @return digest<[]byte]> Byte array digest
* @return err<error> If consistence error
*
---------------------------------------------------------*/
func Hash(input []byte, depth uint16, options... []byte) ([]byte, error) {
/* (1) Manage errors errors
---------------------------------------------------------*/
/* (1) Avoid no depth (no hash at all) */
if( depth < 1 ){
return nil, errors.New("Cannot use a 'depth' of zero. This is inconsistent and means that no hash will be processed");
}
/* (2) Avoir empty input */
if( len(input) < 1 ){
return nil, errors.New("Cannot use an empty 'input'. This is inconsistent");
}
/* (2) Extract optional arguments
---------------------------------------------------------*/
/* (1) Optional salt */
salt := make([]byte, 0)
if len(options) > 0 { salt = options[0] }
/* (2) Optional pepper */
pepper := make([]byte, 0)
if len(options) > 0 { pepper = options[0] }
/* (3) Process cyclic hash
---------------------------------------------------------*/
/* (1) Initialise digest */
digest := make([]byte, 0, HSIZE)
/* (2) Process first hash + salt */
digest = hash( xor.ByteArray(input, salt) )
/* (3) Iterate @depth times */
for depth--; depth > 0; depth-- {
// Add Pepper only for last time
if( depth == 1 ){
digest = hash( xor.ByteArray(digest, pepper) )
} else {
digest = hash(digest)
}
}
return digest, nil
}

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@ -1,156 +0,0 @@
package scha
import "testing"
func TestSimpleHash(t *testing.T){
input := []byte("somePlainText");
expected := []byte{
0x4c, 0xcb, 0x0e, 0xf6, 0x81, 0x99, 0x2e, 0xd6, 0xb8, 0x17, 0x52, 0x1d, 0x09,
0x6e, 0x99, 0x19, 0xe7, 0xda, 0x50, 0xc8, 0xbf, 0x64, 0xae, 0xc1, 0x4f, 0xaa,
0x47, 0x06, 0xf3, 0x49, 0x30, 0x8a, 0x90, 0x8e, 0xd2, 0xff, 0xc2, 0x6d, 0xee,
0xaa, 0xd6, 0x45, 0xd8, 0xb3, 0x17, 0xe3, 0xb9, 0x45, 0x29, 0x26, 0xe2, 0x8e,
0x99, 0x50, 0x94, 0x49, 0x90, 0x02, 0xa5, 0x61, 0x4a, 0x3f, 0x5e, 0xfa};
got, err := Hash(input, 1);
digestLength := uint(len(got));
/* (2) Fail on errors */
if err != nil {
t.Errorf("Expected no errors, got: %s", err);
}
/* (2) Fail on wrong size */
if uint16(digestLength) != HSIZE {
t.Errorf("Expected hash digest of %d bytes ; %d bytes received", HSIZE, digestLength);
}
/* (3) Check each byte */
for k, v := range got{
if v != expected[k] {
t.Errorf("Expected sha[%d] of '%x' to be '%x' ; received '%x'", HSIZE, input, expected, got);
return;
}
}
}
func TestDepth1Plus1Equals2(t *testing.T){
input := []byte("someOtherPlainText");
/* (1) Calculate H1 */
h1, err := Hash(input, 1)
if err != nil {
t.Errorf("Expected no error");
return;
}
/* (2) Calculate H1(H1) */
h11, err := Hash(h1, 1);
if err != nil {
t.Errorf("Expected no error");
return;
}
/* (3) Calculate H2 */
h2, err := Hash(input, 1+1);
if err != nil {
t.Errorf("Expected no error");
return;
}
/* (4) Manage different length */
if len(h11) != len(h2) || len(h11) != int(HSIZE) {
t.Errorf("Expected digest lengths to be %d, got %d and %d", HSIZE, len(h11), len(h2));
return;
}
/* (5) Compare the 2 strings */
for k, v := range h11 {
if v != h2[k] {
t.Errorf("Expected h2() to be equal to h1(h1())\n got '%x'\n expected '%x'", h2, h11)
return;
}
}
}
func TestDepth52Plus64Equals116(t *testing.T){
input := []byte("someOtherPlainText");
/* (1) Calculate H52 */
h52, err := Hash(input, 52)
if err != nil {
t.Errorf("Expected no error");
return;
}
/* (2) Calculate H52(H64) */
h5264, err := Hash(h52, 64);
if err != nil {
t.Errorf("Expected no error");
return;
}
/* (3) Calculate H116 */
h116, err := Hash(input, 52+64);
if err != nil {
t.Errorf("Expected no error");
return;
}
/* (4) Manage different length */
if len(h5264) != len(h116) || len(h5264) != int(HSIZE) {
t.Errorf("Expected digest lengths to be %d, got %d and %d", HSIZE, len(h5264), len(h116));
return;
}
/* (5) Compare the 2 strings */
for k, v := range h5264 {
if v != h116[k] {
t.Errorf("Expected h116() to be equal to h52(h64())\n got '%x'\n expected '%x'", h116, h5264)
return;
}
}
}
func TestDepthError(t *testing.T){
input := []byte("somePlainText");
_, err := Hash(input, 0);
/* (2) Fail on errors */
if err == nil {
t.Errorf("Expected an error for depth of 0");
}
}
func TestEmptyInputError(t *testing.T){
_, err := Hash(nil, 1);
/* (2) Fail on errors */
if err == nil {
t.Errorf("Expected an error for empty input");
}
}

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@ -1,51 +0,0 @@
package timeid
import (
"math"
"time"
)
/* (1) Generates the current time id
*
* @wsize<float64> Window Size in seconds
*
* @return id<uint32> Current time id
* @return parity<uint32> Current time parity
*
---------------------------------------------------------*/
func Generate(wsize float64) (uint32, uint32){
/* (1) If wsize is 0 (div by zero possible error) */
if wsize == 0 { return 0, 0 }
/* (2) Get current timestamp */
timestamp := float64( time.Now().Unix() );
/* (3) Calculate the time id */
var id = uint32( timestamp / wsize );
/* (4) Calculate parity */
var parity = id % 2;
return id, parity;
}
/* (2) Try to guess a previous time id from its parity
*
* @wsize<float64> Window Size in seconds
* @parity<uint32> Received parity
*
* @return id<uint32> The guessed time id
*
---------------------------------------------------------*/
func Guess(wsize float64, parity uint32) uint32{
/* (1) Get current time id */
var idNow, parityNow = Generate(wsize);
/* (2) Update ID with tidNow parity difference */
return idNow - uint32(math.Abs( float64(parityNow) - float64(parity) ));
}

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@ -1,23 +0,0 @@
package timeid
import (
"time"
"testing"
)
func TestGuessing(t *testing.T){
var windowSize float64 = .5;
id, parity := Generate(windowSize);
time.Sleep( time.Duration(windowSize) * time.Second);
var guessedId = Guess(windowSize, parity);
if id != guessedId {
t.Errorf("Wrong guessed id, expected '%d' ; got '%d'", id, guessedId);
}
}

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@ -1,67 +0,0 @@
package xor
import "math"
/* (1) bitwise XOR between bytes
*
* @_left<byte> Left operand
* @_right<byte> Right operand
*
* @return out<byte> Bitwise XOR result between _left and _right
*
---------------------------------------------------------*/
func Byte(_left byte, _right byte) byte {
return _left ^ _right;
}
/* (2) bitwise XOR between Byte arrays
*
* @_left<byte[]> Left operand
* @_right<byte[]> Right operand
*
* @return out<byte[]> Bitwise XOR result between _left and _right
*
* @@ NOTE @@
* If an argument is smaller, it will be right-padded with null bytes (0x00)
*
---------------------------------------------------------*/
func ByteArray(_left []byte, _right []byte) []byte {
/* (1) Process
---------------------------------------------------------*/
/* (1) Extract lengths */
ll := len(_left)
lr := len(_right)
/* (2) Get max length */
l := int(math.Max(float64(ll), float64(lr)))
/* (3) Initialise 'out' */
out := make([]byte, l, l)
/* (2) Process bitwise XOR */
for i := 0 ; i < l ; i++ {
// 1. Out of range for _left
if i >= ll {
out[i] = _right[i];
} else if i >= lr {
out[i] = _left[i];
} else {
out[i] = Byte(_left[i], _right[i])
}
}
return out
}