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798 lines
22 KiB
C++
798 lines
22 KiB
C++
// rijndael-alg-fst.c v2.0 August '99
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// Optimised ANSI C code
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// authors: v1.0: Antoon Bosselaers
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// v2.0: Vincent Rijmen
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/*
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* taken from the 'aescrypt' project: www.sf.net/projects/aescrypt
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* See LICENSE-EST for the license applicable to this file
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*/
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// 14.Dec.2005 Cirilo: Removed silly hex keys; keys are now effectively unsigned char.
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// KevinJ - TODO - What the hell is __UNUS? It causes DevCPP not to compile. I don't know what this is for so I'm taking it out entirely
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/*
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#if (defined(__GNUC__) || defined(__GCCXML__))
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#define __UNUS __attribute__((unused))
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#else
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*/
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#define __UNUS
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//#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "Rijndael.h"
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// KevinJ - Added this to just generate a random initialization vector
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#include "Rand.h"
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#define SC ((BC - 4) >> 1)
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#include "Rijndael-Boxes.h"
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static int ROUNDS;
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static word8 shifts[3][4][2] = {
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{
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{0, 0},
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{1, 3},
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{2, 2},
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{3, 1}
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},
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{
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{0, 0},
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{1, 5},
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{2, 4},
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{3, 3}
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},
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{
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{0, 0},
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{1, 7},
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{3, 5},
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{4, 4}
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}
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};
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word8 mul(word8 a, word8 b) {
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// multiply two elements of GF(2^m)
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// needed for MixColumn and InvMixColumn
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if (a && b)
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return Alogtable[(Logtable[a] + Logtable[b])%255];
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else
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return 0;
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}
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void KeyAddition(word8 a[4][4], word8 rk[4][4], word8 BC) {
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// XOR corresponding text input and round key input bytes
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int i, j;
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for(i = 0; i < BC; i++)
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for(j = 0; j < 4; j++)
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a[i][j] ^= rk[i][j];
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}
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void ShiftRow(word8 a[4][4], word8 d, word8 BC) {
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// Row 0 remains unchanged
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// The other three rows are shifted a variable amount
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word8 tmp[4];
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int i, j;
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for(i = 1; i < 4; i++) {
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for(j = 0; j < BC; j++)
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tmp[j] = a[(j + shifts[SC][i][d]) % BC][i];
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for(j = 0; j < BC; j++)
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a[j][i] = tmp[j];
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}
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}
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void Substitution(word8 a[4][4], word8 box[256], word8 BC) {
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// Replace every byte of the input by the byte at that place
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// in the nonlinear S-box
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int i, j;
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for(i = 0; i < BC; i++)
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for(j = 0; j < 4; j++)
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a[i][j] = box[a[i][j]] ;
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}
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void MixColumn(word8 a[4][4], word8 BC) {
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// Mix the four bytes of every column in a linear way
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word8 b[4][4];
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int i, j;
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for(j = 0; j < BC; j++)
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for(i = 0; i < 4; i++)
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b[j][i] = mul(2,a[j][i])
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^ mul(3,a[j][(i + 1) % 4])
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^ a[j][(i + 2) % 4]
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^ a[j][(i + 3) % 4];
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for(i = 0; i < 4; i++)
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for(j = 0; j < BC; j++)
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a[j][i] = b[j][i];
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}
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void InvMixColumn(word8 a[4][4], word8 BC) {
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// Mix the four bytes of every column in a linear way
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// This is the opposite operation of Mixcolumn
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int j;
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for(j = 0; j < BC; j++)
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*((word32*)a[j]) = *((word32*)U1[a[j][0]])
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^ *((word32*)U2[a[j][1]])
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^ *((word32*)U3[a[j][2]])
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^ *((word32*)U4[a[j][3]]);
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}
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int rijndaelKeySched (word8 k[MAXKC][4], int keyBits __UNUS, word8 W[MAXROUNDS+1][4][4])
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{
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(void) keyBits;
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// Calculate the necessary round keys
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// The number of calculations depends on keyBits and blockBits
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int j, r, t, rconpointer = 0;
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word8 tk[MAXKC][4];
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int KC = ROUNDS - 6;
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for(j = KC-1; j >= 0; j--)
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*((word32*)tk[j]) = *((word32*)k[j]);
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r = 0;
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t = 0;
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// copy values into round key array
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for(j = 0; (j < KC) && (r < (ROUNDS+1)); ) {
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for (; (j < KC) && (t < 4); j++, t++)
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*((word32*)W[r][t]) = *((word32*)tk[j]);
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if (t == 4) {
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r++;
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t = 0;
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}
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}
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while (r < (ROUNDS+1)) { // while not enough round key material calculated
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// calculate new values
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tk[0][0] ^= S[tk[KC-1][1]];
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tk[0][1] ^= S[tk[KC-1][2]];
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tk[0][2] ^= S[tk[KC-1][3]];
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tk[0][3] ^= S[tk[KC-1][0]];
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tk[0][0] ^= rcon[rconpointer++];
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if (KC != 8)
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for(j = 1; j < KC; j++)
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*((word32*)tk[j]) ^= *((word32*)tk[j-1]);
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else {
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for(j = 1; j < KC/2; j++)
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*((word32*)tk[j]) ^= *((word32*)tk[j-1]);
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tk[KC/2][0] ^= S[tk[KC/2 - 1][0]];
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tk[KC/2][1] ^= S[tk[KC/2 - 1][1]];
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tk[KC/2][2] ^= S[tk[KC/2 - 1][2]];
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tk[KC/2][3] ^= S[tk[KC/2 - 1][3]];
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for(j = KC/2 + 1; j < KC; j++)
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*((word32*)tk[j]) ^= *((word32*)tk[j-1]);
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}
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// copy values into round key array
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for(j = 0; (j < KC) && (r < (ROUNDS+1)); ) {
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for (; (j < KC) && (t < 4); j++, t++)
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*((word32*)W[r][t]) = *((word32*)tk[j]);
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if (t == 4) {
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r++;
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t = 0;
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}
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}
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}
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return 0;
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}
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int rijndaelKeyEnctoDec (int keyBits __UNUS, word8 W[MAXROUNDS+1][4][4])
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{
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(void) keyBits;
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int r;
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for (r = 1; r < ROUNDS; r++) {
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InvMixColumn(W[r], 4);
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}
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return 0;
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}
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int rijndaelEncrypt (word8 a[16], word8 b[16], word8 rk[MAXROUNDS+1][4][4])
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{
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// Encryption of one block.
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int r;
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word8 temp[4][4];
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*((word32*)temp[0]) = *((word32*)a) ^ *((word32*)rk[0][0]);
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*((word32*)temp[1]) = *((word32*)(a+4)) ^ *((word32*)rk[0][1]);
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*((word32*)temp[2]) = *((word32*)(a+8)) ^ *((word32*)rk[0][2]);
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*((word32*)temp[3]) = *((word32*)(a+12)) ^ *((word32*)rk[0][3]);
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*((word32*)b) = *((word32*)T1[temp[0][0]])
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^ *((word32*)T2[temp[1][1]])
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^ *((word32*)T3[temp[2][2]])
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^ *((word32*)T4[temp[3][3]]);
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*((word32*)(b+4)) = *((word32*)T1[temp[1][0]])
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^ *((word32*)T2[temp[2][1]])
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^ *((word32*)T3[temp[3][2]])
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^ *((word32*)T4[temp[0][3]]);
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*((word32*)(b+8)) = *((word32*)T1[temp[2][0]])
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^ *((word32*)T2[temp[3][1]])
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^ *((word32*)T3[temp[0][2]])
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^ *((word32*)T4[temp[1][3]]);
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*((word32*)(b+12)) = *((word32*)T1[temp[3][0]])
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^ *((word32*)T2[temp[0][1]])
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^ *((word32*)T3[temp[1][2]])
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^ *((word32*)T4[temp[2][3]]);
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for(r = 1; r < ROUNDS-1; r++) {
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*((word32*)temp[0]) = *((word32*)b) ^ *((word32*)rk[r][0]);
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*((word32*)temp[1]) = *((word32*)(b+4)) ^ *((word32*)rk[r][1]);
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*((word32*)temp[2]) = *((word32*)(b+8)) ^ *((word32*)rk[r][2]);
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*((word32*)temp[3]) = *((word32*)(b+12)) ^ *((word32*)rk[r][3]);
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*((word32*)b) = *((word32*)T1[temp[0][0]])
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^ *((word32*)T2[temp[1][1]])
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^ *((word32*)T3[temp[2][2]])
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^ *((word32*)T4[temp[3][3]]);
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*((word32*)(b+4)) = *((word32*)T1[temp[1][0]])
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^ *((word32*)T2[temp[2][1]])
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^ *((word32*)T3[temp[3][2]])
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^ *((word32*)T4[temp[0][3]]);
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*((word32*)(b+8)) = *((word32*)T1[temp[2][0]])
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^ *((word32*)T2[temp[3][1]])
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^ *((word32*)T3[temp[0][2]])
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^ *((word32*)T4[temp[1][3]]);
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*((word32*)(b+12)) = *((word32*)T1[temp[3][0]])
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^ *((word32*)T2[temp[0][1]])
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^ *((word32*)T3[temp[1][2]])
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^ *((word32*)T4[temp[2][3]]);
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}
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// last round is special
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*((word32*)temp[0]) = *((word32*)b) ^ *((word32*)rk[ROUNDS-1][0]);
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*((word32*)temp[1]) = *((word32*)(b+4)) ^ *((word32*)rk[ROUNDS-1][1]);
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*((word32*)temp[2]) = *((word32*)(b+8)) ^ *((word32*)rk[ROUNDS-1][2]);
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*((word32*)temp[3]) = *((word32*)(b+12)) ^ *((word32*)rk[ROUNDS-1][3]);
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b[0] = T1[temp[0][0]][1];
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b[1] = T1[temp[1][1]][1];
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b[2] = T1[temp[2][2]][1];
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b[3] = T1[temp[3][3]][1];
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b[4] = T1[temp[1][0]][1];
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b[5] = T1[temp[2][1]][1];
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b[6] = T1[temp[3][2]][1];
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b[7] = T1[temp[0][3]][1];
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b[8] = T1[temp[2][0]][1];
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b[9] = T1[temp[3][1]][1];
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b[10] = T1[temp[0][2]][1];
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b[11] = T1[temp[1][3]][1];
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b[12] = T1[temp[3][0]][1];
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b[13] = T1[temp[0][1]][1];
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b[14] = T1[temp[1][2]][1];
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b[15] = T1[temp[2][3]][1];
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*((word32*)b) ^= *((word32*)rk[ROUNDS][0]);
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*((word32*)(b+4)) ^= *((word32*)rk[ROUNDS][1]);
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*((word32*)(b+8)) ^= *((word32*)rk[ROUNDS][2]);
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*((word32*)(b+12)) ^= *((word32*)rk[ROUNDS][3]);
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return 0;
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}
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int rijndaelEncryptRound (word8 a[4][4],
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word8 rk[MAXROUNDS+1][4][4], int rounds)
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// Encrypt only a certain number of rounds.
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// Only used in the Intermediate Value Known Answer Test.
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{
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int r;
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word8 temp[4][4];
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// make number of rounds sane
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if (rounds > ROUNDS) rounds = ROUNDS;
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*((word32*)a[0]) = *((word32*)a[0]) ^ *((word32*)rk[0][0]);
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*((word32*)a[1]) = *((word32*)a[1]) ^ *((word32*)rk[0][1]);
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*((word32*)a[2]) = *((word32*)a[2]) ^ *((word32*)rk[0][2]);
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*((word32*)a[3]) = *((word32*)a[3]) ^ *((word32*)rk[0][3]);
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for(r = 1; (r <= rounds) && (r < ROUNDS); r++) {
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*((word32*)temp[0]) = *((word32*)T1[a[0][0]])
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^ *((word32*)T2[a[1][1]])
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^ *((word32*)T3[a[2][2]])
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^ *((word32*)T4[a[3][3]]);
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*((word32*)temp[1]) = *((word32*)T1[a[1][0]])
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^ *((word32*)T2[a[2][1]])
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^ *((word32*)T3[a[3][2]])
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^ *((word32*)T4[a[0][3]]);
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*((word32*)temp[2]) = *((word32*)T1[a[2][0]])
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^ *((word32*)T2[a[3][1]])
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^ *((word32*)T3[a[0][2]])
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^ *((word32*)T4[a[1][3]]);
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*((word32*)temp[3]) = *((word32*)T1[a[3][0]])
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^ *((word32*)T2[a[0][1]])
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^ *((word32*)T3[a[1][2]])
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^ *((word32*)T4[a[2][3]]);
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*((word32*)a[0]) = *((word32*)temp[0]) ^ *((word32*)rk[r][0]);
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*((word32*)a[1]) = *((word32*)temp[1]) ^ *((word32*)rk[r][1]);
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*((word32*)a[2]) = *((word32*)temp[2]) ^ *((word32*)rk[r][2]);
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*((word32*)a[3]) = *((word32*)temp[3]) ^ *((word32*)rk[r][3]);
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}
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if (rounds == ROUNDS) {
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// last round is special
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temp[0][0] = T1[a[0][0]][1];
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temp[0][1] = T1[a[1][1]][1];
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temp[0][2] = T1[a[2][2]][1];
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temp[0][3] = T1[a[3][3]][1];
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temp[1][0] = T1[a[1][0]][1];
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temp[1][1] = T1[a[2][1]][1];
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temp[1][2] = T1[a[3][2]][1];
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temp[1][3] = T1[a[0][3]][1];
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temp[2][0] = T1[a[2][0]][1];
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temp[2][1] = T1[a[3][1]][1];
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temp[2][2] = T1[a[0][2]][1];
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temp[2][3] = T1[a[1][3]][1];
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temp[3][0] = T1[a[3][0]][1];
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temp[3][1] = T1[a[0][1]][1];
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temp[3][2] = T1[a[1][2]][1];
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temp[3][3] = T1[a[2][3]][1];
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*((word32*)a[0]) = *((word32*)temp[0]) ^ *((word32*)rk[ROUNDS][0]);
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*((word32*)a[1]) = *((word32*)temp[1]) ^ *((word32*)rk[ROUNDS][1]);
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*((word32*)a[2]) = *((word32*)temp[2]) ^ *((word32*)rk[ROUNDS][2]);
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*((word32*)a[3]) = *((word32*)temp[3]) ^ *((word32*)rk[ROUNDS][3]);
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}
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return 0;
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}
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int rijndaelDecrypt (word8 a[16], word8 b[16], word8 rk[MAXROUNDS+1][4][4])
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{
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int r;
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word8 temp[4][4];
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*((word32*)temp[0]) = *((word32*)a) ^ *((word32*)rk[ROUNDS][0]);
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*((word32*)temp[1]) = *((word32*)(a+4)) ^ *((word32*)rk[ROUNDS][1]);
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*((word32*)temp[2]) = *((word32*)(a+8)) ^ *((word32*)rk[ROUNDS][2]);
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*((word32*)temp[3]) = *((word32*)(a+12)) ^ *((word32*)rk[ROUNDS][3]);
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*((word32*)b) = *((word32*)T5[temp[0][0]])
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^ *((word32*)T6[temp[3][1]])
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^ *((word32*)T7[temp[2][2]])
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^ *((word32*)T8[temp[1][3]]);
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*((word32*)(b+4)) = *((word32*)T5[temp[1][0]])
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^ *((word32*)T6[temp[0][1]])
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^ *((word32*)T7[temp[3][2]])
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^ *((word32*)T8[temp[2][3]]);
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*((word32*)(b+8)) = *((word32*)T5[temp[2][0]])
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^ *((word32*)T6[temp[1][1]])
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^ *((word32*)T7[temp[0][2]])
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^ *((word32*)T8[temp[3][3]]);
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*((word32*)(b+12)) = *((word32*)T5[temp[3][0]])
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^ *((word32*)T6[temp[2][1]])
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^ *((word32*)T7[temp[1][2]])
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^ *((word32*)T8[temp[0][3]]);
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for(r = ROUNDS-1; r > 1; r--) {
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*((word32*)temp[0]) = *((word32*)b) ^ *((word32*)rk[r][0]);
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*((word32*)temp[1]) = *((word32*)(b+4)) ^ *((word32*)rk[r][1]);
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*((word32*)temp[2]) = *((word32*)(b+8)) ^ *((word32*)rk[r][2]);
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*((word32*)temp[3]) = *((word32*)(b+12)) ^ *((word32*)rk[r][3]);
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*((word32*)b) = *((word32*)T5[temp[0][0]])
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^ *((word32*)T6[temp[3][1]])
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^ *((word32*)T7[temp[2][2]])
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^ *((word32*)T8[temp[1][3]]);
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*((word32*)(b+4)) = *((word32*)T5[temp[1][0]])
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^ *((word32*)T6[temp[0][1]])
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^ *((word32*)T7[temp[3][2]])
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^ *((word32*)T8[temp[2][3]]);
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*((word32*)(b+8)) = *((word32*)T5[temp[2][0]])
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^ *((word32*)T6[temp[1][1]])
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^ *((word32*)T7[temp[0][2]])
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^ *((word32*)T8[temp[3][3]]);
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*((word32*)(b+12)) = *((word32*)T5[temp[3][0]])
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^ *((word32*)T6[temp[2][1]])
|
|
^ *((word32*)T7[temp[1][2]])
|
|
^ *((word32*)T8[temp[0][3]]);
|
|
}
|
|
// last round is special
|
|
*((word32*)temp[0]) = *((word32*)b) ^ *((word32*)rk[1][0]);
|
|
*((word32*)temp[1]) = *((word32*)(b+4)) ^ *((word32*)rk[1][1]);
|
|
*((word32*)temp[2]) = *((word32*)(b+8)) ^ *((word32*)rk[1][2]);
|
|
*((word32*)temp[3]) = *((word32*)(b+12)) ^ *((word32*)rk[1][3]);
|
|
b[0] = S5[temp[0][0]];
|
|
b[1] = S5[temp[3][1]];
|
|
b[2] = S5[temp[2][2]];
|
|
b[3] = S5[temp[1][3]];
|
|
b[4] = S5[temp[1][0]];
|
|
b[5] = S5[temp[0][1]];
|
|
b[6] = S5[temp[3][2]];
|
|
b[7] = S5[temp[2][3]];
|
|
b[8] = S5[temp[2][0]];
|
|
b[9] = S5[temp[1][1]];
|
|
b[10] = S5[temp[0][2]];
|
|
b[11] = S5[temp[3][3]];
|
|
b[12] = S5[temp[3][0]];
|
|
b[13] = S5[temp[2][1]];
|
|
b[14] = S5[temp[1][2]];
|
|
b[15] = S5[temp[0][3]];
|
|
*((word32*)b) ^= *((word32*)rk[0][0]);
|
|
*((word32*)(b+4)) ^= *((word32*)rk[0][1]);
|
|
*((word32*)(b+8)) ^= *((word32*)rk[0][2]);
|
|
*((word32*)(b+12)) ^= *((word32*)rk[0][3]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int rijndaelDecryptRound (word8 a[4][4],
|
|
word8 rk[MAXROUNDS+1][4][4], int rounds)
|
|
// Decrypt only a certain number of rounds.
|
|
// Only used in the Intermediate Value Known Answer Test.
|
|
// Operations rearranged such that the intermediate values
|
|
// of decryption correspond with the intermediate values
|
|
// of encryption.
|
|
|
|
{
|
|
int r;
|
|
|
|
|
|
// make number of rounds sane
|
|
if (rounds > ROUNDS) rounds = ROUNDS;
|
|
|
|
// First the special round:
|
|
// without InvMixColumn
|
|
// with extra KeyAddition
|
|
|
|
KeyAddition(a,rk[ROUNDS],4);
|
|
Substitution(a,Si,4);
|
|
ShiftRow(a,1,4);
|
|
|
|
// ROUNDS-1 ordinary rounds
|
|
|
|
for(r = ROUNDS-1; r > rounds; r--) {
|
|
KeyAddition(a,rk[r],4);
|
|
InvMixColumn(a,4);
|
|
Substitution(a,Si,4);
|
|
ShiftRow(a,1,4);
|
|
}
|
|
|
|
if (rounds == 0) {
|
|
// End with the extra key addition
|
|
|
|
KeyAddition(a,rk[0],4);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*** End Rijndael algorithm, Begin the AES Interface ***/
|
|
|
|
|
|
int makeKey(keyInstance *key, BYTE direction, int keyByteLen, char *keyMaterial)
|
|
{
|
|
word8 k[MAXKC][4];
|
|
int i;
|
|
int keyLen = keyByteLen*8;
|
|
|
|
if (key == NULL) {
|
|
return BAD_KEY_INSTANCE;
|
|
}
|
|
|
|
if ((direction == DIR_ENCRYPT) || (direction == DIR_DECRYPT)) {
|
|
key->direction = direction;
|
|
} else {
|
|
return BAD_KEY_DIR;
|
|
}
|
|
|
|
if ((keyLen == 128) || (keyLen == 192) || (keyLen == 256)) {
|
|
key->keyLen = keyLen;
|
|
} else {
|
|
return BAD_KEY_MAT;
|
|
}
|
|
|
|
if ( keyMaterial ) {
|
|
strncpy(key->keyMaterial, keyMaterial, keyByteLen);
|
|
} else {
|
|
return BAD_KEY_MAT;
|
|
}
|
|
|
|
ROUNDS = keyLen/32 + 6;
|
|
|
|
// initialize key schedule:
|
|
for(i = 0; i < key->keyLen/8; i++) {
|
|
k[i / 4][i % 4] = (word8) key->keyMaterial[i];
|
|
}
|
|
rijndaelKeySched (k, key->keyLen, key->keySched);
|
|
if (direction == DIR_DECRYPT)
|
|
rijndaelKeyEnctoDec (key->keyLen, key->keySched);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
int cipherInit(cipherInstance *cipher, BYTE mode, char *IV)
|
|
{
|
|
int i;
|
|
|
|
if ((mode == MODE_ECB) || (mode == MODE_CBC) || (mode == MODE_CFB1)) {
|
|
cipher->mode = mode;
|
|
} else {
|
|
return BAD_CIPHER_MODE;
|
|
}
|
|
|
|
|
|
if (IV != NULL) {
|
|
for(i = 0; i < 16; i++) cipher->IV[i] = IV[i];
|
|
}
|
|
else
|
|
{
|
|
// KevinJ - Added this to just generate a random initialization vector
|
|
for(i = 0; i < 16; i++)
|
|
cipher->IV[i]=(BYTE)randomMT();
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
int blockEncrypt(cipherInstance *cipher,
|
|
keyInstance *key, BYTE *input, int inputByteLen, BYTE *outBuffer)
|
|
{
|
|
int i, k, numBlocks;
|
|
word8 block[16], iv[4][4];
|
|
int inputLen = inputByteLen*8;
|
|
|
|
if (cipher == NULL ||
|
|
key == NULL ||
|
|
key->direction == DIR_DECRYPT) {
|
|
return BAD_CIPHER_STATE;
|
|
}
|
|
|
|
|
|
numBlocks = inputLen/128;
|
|
|
|
switch (cipher->mode) {
|
|
case MODE_ECB:
|
|
for (i = numBlocks; i > 0; i--) {
|
|
|
|
rijndaelEncrypt (input, outBuffer, key->keySched);
|
|
|
|
input += 16;
|
|
outBuffer += 16;
|
|
}
|
|
break;
|
|
|
|
case MODE_CBC:
|
|
#if STRICT_ALIGN
|
|
memcpy(block,cipher->IV,16);
|
|
#else
|
|
*((word32*)block) = *((word32*)(cipher->IV));
|
|
*((word32*)(block+4)) = *((word32*)(cipher->IV+4));
|
|
*((word32*)(block+8)) = *((word32*)(cipher->IV+8));
|
|
*((word32*)(block+12)) = *((word32*)(cipher->IV+12));
|
|
#endif
|
|
|
|
for (i = numBlocks; i > 0; i--) {
|
|
*((word32*)block) ^= *((word32*)(input));
|
|
*((word32*)(block+4)) ^= *((word32*)(input+4));
|
|
*((word32*)(block+8)) ^= *((word32*)(input+8));
|
|
*((word32*)(block+12)) ^= *((word32*)(input+12));
|
|
|
|
rijndaelEncrypt (block, outBuffer, key->keySched);
|
|
|
|
input += 16;
|
|
outBuffer += 16;
|
|
}
|
|
break;
|
|
|
|
case MODE_CFB1:
|
|
#if STRICT_ALIGN
|
|
memcpy(iv,cipher->IV,16);
|
|
#else
|
|
*((word32*)iv[0]) = *((word32*)(cipher->IV));
|
|
*((word32*)iv[1]) = *((word32*)(cipher->IV+4));
|
|
*((word32*)iv[2]) = *((word32*)(cipher->IV+8));
|
|
*((word32*)iv[3]) = *((word32*)(cipher->IV+12));
|
|
#endif
|
|
for (i = numBlocks; i > 0; i--) {
|
|
for (k = 0; k < 128; k++) {
|
|
*((word32*)block) = *((word32*)iv[0]);
|
|
*((word32*)(block+4)) = *((word32*)iv[1]);
|
|
*((word32*)(block+8)) = *((word32*)iv[2]);
|
|
*((word32*)(block+12)) = *((word32*)iv[3]);
|
|
|
|
rijndaelEncrypt (block, block, key->keySched);
|
|
outBuffer[k/8] ^= (block[0] & 0x80) >> (k & 7);
|
|
iv[0][0] = (iv[0][0] << 1) | (iv[0][1] >> 7);
|
|
iv[0][1] = (iv[0][1] << 1) | (iv[0][2] >> 7);
|
|
iv[0][2] = (iv[0][2] << 1) | (iv[0][3] >> 7);
|
|
iv[0][3] = (iv[0][3] << 1) | (iv[1][0] >> 7);
|
|
iv[1][0] = (iv[1][0] << 1) | (iv[1][1] >> 7);
|
|
iv[1][1] = (iv[1][1] << 1) | (iv[1][2] >> 7);
|
|
iv[1][2] = (iv[1][2] << 1) | (iv[1][3] >> 7);
|
|
iv[1][3] = (iv[1][3] << 1) | (iv[2][0] >> 7);
|
|
iv[2][0] = (iv[2][0] << 1) | (iv[2][1] >> 7);
|
|
iv[2][1] = (iv[2][1] << 1) | (iv[2][2] >> 7);
|
|
iv[2][2] = (iv[2][2] << 1) | (iv[2][3] >> 7);
|
|
iv[2][3] = (iv[2][3] << 1) | (iv[3][0] >> 7);
|
|
iv[3][0] = (iv[3][0] << 1) | (iv[3][1] >> 7);
|
|
iv[3][1] = (iv[3][1] << 1) | (iv[3][2] >> 7);
|
|
iv[3][2] = (iv[3][2] << 1) | (iv[3][3] >> 7);
|
|
iv[3][3] = (word8)((iv[3][3] << 1) | (outBuffer[k/8] >> (7-(k&7))) & 1);
|
|
}
|
|
}
|
|
break;
|
|
|
|
default:
|
|
return BAD_CIPHER_STATE;
|
|
}
|
|
|
|
return numBlocks*128;
|
|
}
|
|
|
|
int blockDecrypt(cipherInstance *cipher,
|
|
keyInstance *key, BYTE *input, int inputByteLen, BYTE *outBuffer)
|
|
{
|
|
int i, k, numBlocks;
|
|
word8 block[16], iv[4][4];
|
|
int inputLen = inputByteLen*8;
|
|
|
|
if (cipher == NULL ||
|
|
key == NULL ||
|
|
cipher->mode != MODE_CFB1 && key->direction == DIR_ENCRYPT) {
|
|
return BAD_CIPHER_STATE;
|
|
}
|
|
|
|
|
|
numBlocks = inputLen/128;
|
|
|
|
switch (cipher->mode) {
|
|
case MODE_ECB:
|
|
for (i = numBlocks; i > 0; i--) {
|
|
|
|
rijndaelDecrypt (input, outBuffer, key->keySched);
|
|
|
|
input += 16;
|
|
outBuffer += 16;
|
|
|
|
}
|
|
break;
|
|
|
|
case MODE_CBC:
|
|
// first block
|
|
|
|
rijndaelDecrypt (input, block, key->keySched);
|
|
#if STRICT_ALIGN
|
|
memcpy(outBuffer,cipher->IV,16);
|
|
*((word32*)(outBuffer)) ^= *((word32*)block);
|
|
*((word32*)(outBuffer+4)) ^= *((word32*)(block+4));
|
|
*((word32*)(outBuffer+8)) ^= *((word32*)(block+8));
|
|
*((word32*)(outBuffer+12)) ^= *((word32*)(block+12));
|
|
#else
|
|
*((word32*)(outBuffer)) = *((word32*)block) ^ *((word32*)(cipher->IV));
|
|
*((word32*)(outBuffer+4)) = *((word32*)(block+4)) ^ *((word32*)(cipher->IV+4));
|
|
*((word32*)(outBuffer+8)) = *((word32*)(block+8)) ^ *((word32*)(cipher->IV+8));
|
|
*((word32*)(outBuffer+12)) = *((word32*)(block+12)) ^ *((word32*)(cipher->IV+12));
|
|
#endif
|
|
|
|
// next blocks
|
|
for (i = numBlocks-1; i > 0; i--) {
|
|
|
|
rijndaelDecrypt (input, block, key->keySched);
|
|
|
|
*((word32*)(outBuffer+16)) = *((word32*)block) ^
|
|
*((word32*)(input-16));
|
|
*((word32*)(outBuffer+20)) = *((word32*)(block+4)) ^
|
|
*((word32*)(input-12));
|
|
*((word32*)(outBuffer+24)) = *((word32*)(block+8)) ^
|
|
*((word32*)(input-8));
|
|
*((word32*)(outBuffer+28)) = *((word32*)(block+12)) ^
|
|
*((word32*)(input-4));
|
|
|
|
input += 16;
|
|
outBuffer += 16;
|
|
}
|
|
break;
|
|
|
|
case MODE_CFB1:
|
|
#if STRICT_ALIGN
|
|
memcpy(iv,cipher->IV,16);
|
|
#else
|
|
*((word32*)iv[0]) = *((word32*)(cipher->IV));
|
|
*((word32*)iv[1]) = *((word32*)(cipher->IV+4));
|
|
*((word32*)iv[2]) = *((word32*)(cipher->IV+8));
|
|
*((word32*)iv[3]) = *((word32*)(cipher->IV+12));
|
|
#endif
|
|
for (i = numBlocks; i > 0; i--) {
|
|
for (k = 0; k < 128; k++) {
|
|
*((word32*)block) = *((word32*)iv[0]);
|
|
*((word32*)(block+4)) = *((word32*)iv[1]);
|
|
*((word32*)(block+8)) = *((word32*)iv[2]);
|
|
*((word32*)(block+12)) = *((word32*)iv[3]);
|
|
|
|
rijndaelEncrypt (block, block, key->keySched);
|
|
iv[0][0] = (iv[0][0] << 1) | (iv[0][1] >> 7);
|
|
iv[0][1] = (iv[0][1] << 1) | (iv[0][2] >> 7);
|
|
iv[0][2] = (iv[0][2] << 1) | (iv[0][3] >> 7);
|
|
iv[0][3] = (iv[0][3] << 1) | (iv[1][0] >> 7);
|
|
iv[1][0] = (iv[1][0] << 1) | (iv[1][1] >> 7);
|
|
iv[1][1] = (iv[1][1] << 1) | (iv[1][2] >> 7);
|
|
iv[1][2] = (iv[1][2] << 1) | (iv[1][3] >> 7);
|
|
iv[1][3] = (iv[1][3] << 1) | (iv[2][0] >> 7);
|
|
iv[2][0] = (iv[2][0] << 1) | (iv[2][1] >> 7);
|
|
iv[2][1] = (iv[2][1] << 1) | (iv[2][2] >> 7);
|
|
iv[2][2] = (iv[2][2] << 1) | (iv[2][3] >> 7);
|
|
iv[2][3] = (iv[2][3] << 1) | (iv[3][0] >> 7);
|
|
iv[3][0] = (iv[3][0] << 1) | (iv[3][1] >> 7);
|
|
iv[3][1] = (iv[3][1] << 1) | (iv[3][2] >> 7);
|
|
iv[3][2] = (iv[3][2] << 1) | (iv[3][3] >> 7);
|
|
iv[3][3] = (word8)((iv[3][3] << 1) | (input[k/8] >> (7-(k&7))) & 1);
|
|
outBuffer[k/8] ^= (block[0] & 0x80) >> (k & 7);
|
|
}
|
|
}
|
|
break;
|
|
|
|
default:
|
|
return BAD_CIPHER_STATE;
|
|
}
|
|
|
|
return numBlocks*128;
|
|
}
|
|
|
|
|
|
/**
|
|
* cipherUpdateRounds:
|
|
*
|
|
* Encrypts/Decrypts exactly one full block a specified number of rounds.
|
|
* Only used in the Intermediate Value Known Answer Test.
|
|
*
|
|
* Returns:
|
|
* TRUE - on success
|
|
* BAD_CIPHER_STATE - cipher in bad state (e.g., not initialized)
|
|
*/
|
|
|
|
int cipherUpdateRounds(cipherInstance *cipher,
|
|
keyInstance *key, BYTE *input, int inputLen __UNUS, BYTE *outBuffer, int rounds)
|
|
{
|
|
(void) inputLen;
|
|
|
|
int j;
|
|
word8 block[4][4];
|
|
|
|
if (cipher == NULL ||
|
|
key == NULL) {
|
|
return BAD_CIPHER_STATE;
|
|
}
|
|
|
|
for (j = 3; j >= 0; j--) {
|
|
// parse input stream into rectangular array
|
|
*((word32*)block[j]) = *((word32*)(input+4*j));
|
|
}
|
|
|
|
switch (key->direction) {
|
|
case DIR_ENCRYPT:
|
|
rijndaelEncryptRound (block, key->keySched, rounds);
|
|
break;
|
|
|
|
case DIR_DECRYPT:
|
|
rijndaelDecryptRound (block, key->keySched, rounds);
|
|
break;
|
|
|
|
default: return BAD_KEY_DIR;
|
|
}
|
|
|
|
for (j = 3; j >= 0; j--) {
|
|
// parse rectangular array into output ciphertext bytes
|
|
*((word32*)(outBuffer+4*j)) = *((word32*)block[j]);
|
|
}
|
|
|
|
return TRUE;
|
|
}
|