Java實現RC5算法
java實現RC5算法 更多 0 java RC5java實現RC5算法
[Java]代碼
interface RC5 { public int keySize(); public long encrypt(long pt); public long decrypt(long ct); public void setup(byte[] K); }
// RC5-32/12/8 implementation. Unrolls all important loops.
class RC5_32_12_8 implements RC5 { private static final int w = 32; / word size in bits / private static final int r = 12; / number of rounds / private static final int b = 8; / number of bytes in key / private static final int c = 2; / number words in key = ceil(8b/w)/ private static final int t = 26; / size of table S = 2(r+1) words / // static int[] initS = new int[t]; static int initS0, initS1, initS2, initS3, initS4, initS5, initS6, initS7, initS8, initS9; static int initS10, initS11, initS12, initS13, initS14, initS15, initS16, initS17, initS18, initS19; static int initS20, initS21, initS22, initS23, initS24, initS25; // int[] S = new int[t]; / expanded key table / int S0, S1, S2, S3, S4, S5, S6, S7, S8, S9; int S10, S11, S12, S13, S14, S15, S16, S17, S18, S19; int S20, S21, S22, S23, S24, S25; private static final int P = 0xb7e15163, Q = 0x9e3779b9; / magic constants /
static { initS0 = P; // for (int i = 1; i < t; i++) { // initS[i] = initS[i-1] + Q; // } initS1 = initS0 + Q; initS2 = initS1 + Q; initS3 = initS2 + Q; initS4 = initS3 + Q; initS5 = initS4 + Q; initS6 = initS5 + Q; initS7 = initS6 + Q; initS8 = initS7 + Q; initS9 = initS8 + Q; initS10 = initS9 + Q; initS11 = initS10 + Q; initS12 = initS11 + Q; initS13 = initS12 + Q; initS14 = initS13 + Q; initS15 = initS14 + Q; initS16 = initS15 + Q; initS17 = initS16 + Q; initS18 = initS17 + Q; initS19 = initS18 + Q; initS20 = initS19 + Q; initS21 = initS20 + Q; initS22 = initS21 + Q; initS23 = initS22 + Q; initS24 = initS23 + Q; initS25 = initS24 + Q; }
public int keySize() { return b; }
// int ROTL(int x, int y) // { // return (x << (y & (w-1))) | (x >>> (w - (y & (w-1)))); // } // // int ROTR(int x, int y) // { // return (x >>> (y & (w-1))) | (x << (w - (y & (w-1)))); // }
public long encrypt(long pt) { int A = (int)(pt & 0xffffffffL) + S0; int B = (int)(pt >>> 32) + S1; // for (int i = 1; i <= r; i++) { // int x = A ^ B; // int y = B & (w-1); // A = /ROTL(A ^ B, B)/ ((x << y) | (x >>> (w-y))) + S[2i]; // x = B ^ A; // y = A & (w-1); // B = /ROTL(B ^ A, A)/ ((x << y) | (x >>> (w-y))) + S[2i+1]; // } int x, y; x = A ^ B; y = B & (w-1); A = ((x << y) | (x >>> (w-y))) + S2 ; x = B ^ A; y = A & (w-1); B = ((x << y) | (x >>> (w-y))) + S3 ; x = A ^ B; y = B & (w-1); A = ((x << y) | (x >>> (w-y))) + S4 ; x = B ^ A; y = A & (w-1); B = ((x << y) | (x >>> (w-y))) + S5 ; x = A ^ B; y = B & (w-1); A = ((x << y) | (x >>> (w-y))) + S6 ; x = B ^ A; y = A & (w-1); B = ((x << y) | (x >>> (w-y))) + S7 ; x = A ^ B; y = B & (w-1); A = ((x << y) | (x >>> (w-y))) + S8 ; x = B ^ A; y = A & (w-1); B = ((x << y) | (x >>> (w-y))) + S9 ; x = A ^ B; y = B & (w-1); A = ((x << y) | (x >>> (w-y))) + S10; x = B ^ A; y = A & (w-1); B = ((x << y) | (x >>> (w-y))) + S11; x = A ^ B; y = B & (w-1); A = ((x << y) | (x >>> (w-y))) + S12; x = B ^ A; y = A & (w-1); B = ((x << y) | (x >>> (w-y))) + S13; x = A ^ B; y = B & (w-1); A = ((x << y) | (x >>> (w-y))) + S14; x = B ^ A; y = A & (w-1); B = ((x << y) | (x >>> (w-y))) + S15; x = A ^ B; y = B & (w-1); A = ((x << y) | (x >>> (w-y))) + S16; x = B ^ A; y = A & (w-1); B = ((x << y) | (x >>> (w-y))) + S17; x = A ^ B; y = B & (w-1); A = ((x << y) | (x >>> (w-y))) + S18; x = B ^ A; y = A & (w-1); B = ((x << y) | (x >>> (w-y))) + S19; x = A ^ B; y = B & (w-1); A = ((x << y) | (x >>> (w-y))) + S20; x = B ^ A; y = A & (w-1); B = ((x << y) | (x >>> (w-y))) + S21; x = A ^ B; y = B & (w-1); A = ((x << y) | (x >>> (w-y))) + S22; x = B ^ A; y = A & (w-1); B = ((x << y) | (x >>> (w-y))) + S23; x = A ^ B; y = B & (w-1); A = ((x << y) | (x >>> (w-y))) + S24; x = B ^ A; y = A & (w-1); B = ((x << y) | (x >>> (w-y))) + S25; return ((long)B << 32) + (A & 0xffffffffL); }
public long decrypt(long ct) { int A = (int)(ct & 0xffffffffL); int B = (int)(ct >>> 32); // for (int i = r; i > 0; i--) { // int x = B - S[2i+1]; // int y = A & (w-1); // B = /ROTR(B - S[2i+1], A)/ ((x >>> y) | (x << (w-y))) ^ A; // x = A - S[2i]; // y = B & (w-1); // A = /ROTR(A - S[2i], B)/ ((x >>> y) | (x << (w-y))) ^ B; // } int x, y; x = B - S25; y = A & (w-1); B = ((x >>> y) | (x << (w-y))) ^ A; x = A - S24; y = B & (w-1); A = ((x >>> y) | (x << (w-y))) ^ B; x = B - S23; y = A & (w-1); B = ((x >>> y) | (x << (w-y))) ^ A; x = A - S22; y = B & (w-1); A = ((x >>> y) | (x << (w-y))) ^ B; x = B - S21; y = A & (w-1); B = ((x >>> y) | (x << (w-y))) ^ A; x = A - S20; y = B & (w-1); A = ((x >>> y) | (x << (w-y))) ^ B; x = B - S19; y = A & (w-1); B = ((x >>> y) | (x << (w-y))) ^ A; x = A - S18; y = B & (w-1); A = ((x >>> y) | (x << (w-y))) ^ B; x = B - S17; y = A & (w-1); B = ((x >>> y) | (x << (w-y))) ^ A; x = A - S16; y = B & (w-1); A = ((x >>> y) | (x << (w-y))) ^ B; x = B - S15; y = A & (w-1); B = ((x >>> y) | (x << (w-y))) ^ A; x = A - S14; y = B & (w-1); A = ((x >>> y) | (x << (w-y))) ^ B; x = B - S13; y = A & (w-1); B = ((x >>> y) | (x << (w-y))) ^ A; x = A - S12; y = B & (w-1); A = ((x >>> y) | (x << (w-y))) ^ B; x = B - S11; y = A & (w-1); B = ((x >>> y) | (x << (w-y))) ^ A; x = A - S10; y = B & (w-1); A = ((x >>> y) | (x << (w-y))) ^ B; x = B - S9 ; y = A & (w-1); B = ((x >>> y) | (x << (w-y))) ^ A; x = A - S8 ; y = B & (w-1); A = ((x >>> y) | (x << (w-y))) ^ B; x = B - S7 ; y = A & (w-1); B = ((x >>> y) | (x << (w-y))) ^ A; x = A - S6 ; y = B & (w-1); A = ((x >>> y) | (x << (w-y))) ^ B; x = B - S5 ; y = A & (w-1); B = ((x >>> y) | (x << (w-y))) ^ A; x = A - S4 ; y = B & (w-1); A = ((x >>> y) | (x << (w-y))) ^ B; x = B - S3 ; y = A & (w-1); B = ((x >>> y) | (x << (w-y))) ^ A; x = A - S2 ; y = B & (w-1); A = ((x >>> y) | (x << (w-y))) ^ B; return ((long)(B - S1) << 32) + ((A - S0) & 0xffffffffL); }
public void setup(byte[] K) { int i, j, k, u=w/8, A, B; / Initialize L, then S, then mix key into S / // for (i=b-1,L[c-1]=0; i!=-1; i--) L[i/u] = (L[i/u]<<8)+(K[i]&0xff); int L0 = ((K[3] & 0xff) << 24) | ((K[2] & 0xff) << 16) | ((K[1] & 0xff) << 8) | (K[0] & 0xff); int L1 = ((K[7] & 0xff) << 24) | ((K[6] & 0xff) << 16) | ((K[5] & 0xff) << 8) | (K[4] & 0xff); // for (A=B=i=j=k=0; k<3t; k++) { / 3t > 3c / // int x = S[i] + (A+B); // A = S[i] = /ROTL(S[i]+(A+B),3);/ (x << 3) | (x >>> 29); // x = L[j] + (A+B); // int y = (A+B) & (w-1); // B = L[j] = /ROTL(L[j]+(A+B),(A+B));/ (x << y) | (x >>> (w-y)); // /i = (i+1) % t;/ i++; if (i >= t) i = 0; // /j = (j+1) % c;*/ j++; if (j >= c) j = 0; // } A = B = 0; int x, y; x = initS0 + (A+B); A = S0 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = initS1 + (A+B); A = S1 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = initS2 + (A+B); A = S2 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = initS3 + (A+B); A = S3 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = initS4 + (A+B); A = S4 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = initS5 + (A+B); A = S5 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = initS6 + (A+B); A = S6 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = initS7 + (A+B); A = S7 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = initS8 + (A+B); A = S8 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = initS9 + (A+B); A = S9 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = initS10 + (A+B); A = S10 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = initS11 + (A+B); A = S11 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = initS12 + (A+B); A = S12 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = initS13 + (A+B); A = S13 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = initS14 + (A+B); A = S14 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = initS15 + (A+B); A = S15 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = initS16 + (A+B); A = S16 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = initS17 + (A+B); A = S17 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = initS18 + (A+B); A = S18 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = initS19 + (A+B); A = S19 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = initS20 + (A+B); A = S20 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = initS21 + (A+B); A = S21 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = initS22 + (A+B); A = S22 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = initS23 + (A+B); A = S23 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = initS24 + (A+B); A = S24 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = initS25 + (A+B); A = S25 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y));
x = S0 + (A+B); A = S0 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = S1 + (A+B); A = S1 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = S2 + (A+B); A = S2 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = S3 + (A+B); A = S3 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = S4 + (A+B); A = S4 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = S5 + (A+B); A = S5 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = S6 + (A+B); A = S6 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = S7 + (A+B); A = S7 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = S8 + (A+B); A = S8 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = S9 + (A+B); A = S9 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = S10 + (A+B); A = S10 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = S11 + (A+B); A = S11 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = S12 + (A+B); A = S12 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = S13 + (A+B); A = S13 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = S14 + (A+B); A = S14 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = S15 + (A+B); A = S15 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = S16 + (A+B); A = S16 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = S17 + (A+B); A = S17 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = S18 + (A+B); A = S18 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = S19 + (A+B); A = S19 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = S20 + (A+B); A = S20 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = S21 + (A+B); A = S21 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = S22 + (A+B); A = S22 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = S23 + (A+B); A = S23 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = S24 + (A+B); A = S24 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = S25 + (A+B); A = S25 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = S0 + (A+B); A = S0 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = S1 + (A+B); A = S1 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = S2 + (A+B); A = S2 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = S3 + (A+B); A = S3 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = S4 + (A+B); A = S4 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = S5 + (A+B); A = S5 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = S6 + (A+B); A = S6 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = S7 + (A+B); A = S7 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = S8 + (A+B); A = S8 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = S9 + (A+B); A = S9 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = S10 + (A+B); A = S10 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = S11 + (A+B); A = S11 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = S12 + (A+B); A = S12 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = S13 + (A+B); A = S13 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = S14 + (A+B); A = S14 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = S15 + (A+B); A = S15 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = S16 + (A+B); A = S16 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = S17 + (A+B); A = S17 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = S18 + (A+B); A = S18 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = S19 + (A+B); A = S19 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = S20 + (A+B); A = S20 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = S21 + (A+B); A = S21 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = S22 + (A+B); A = S22 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = S23 + (A+B); A = S23 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y)); x = S24 + (A+B); A = S24 = (x << 3) | (x >>> 29); x = L0 + (A+B); y = (A+B) & (w-1); B = L0 = (x << y) | (x >>> (w-y)); x = S25 + (A+B); A = S25 = (x << 3) | (x >>> 29); x = L1 + (A+B); y = (A+B) & (w-1); B = L1 = (x << y) | (x >>> (w-y));} }
// RC5 demo worker thread.
class RC5test implements Runnable { RC5demo Host;
RC5test(RC5demo host) { Host = host; }
public void run() { // cyphertext and iv data from the RSA test pseudo-contest "RSA-32/12/8-test" long ct = 0x496def29b74be041L; long iv = 0xc41f78c1f839a5d9L; RC5 rc5 = new RC5_32_12_8(); byte[] key = new byte[rc5.keySize()]; // uncommenting these lines gives the correct key, we'll just start searching close to it //key[0] = (byte)0x82; //key[1] = (byte)0xe5; //key[2] = (byte)0x1b; key[3] = (byte)0x9f; key[4] = (byte)0x9c; key[5] = (byte)0xc7; key[6] = (byte)0x18; key[7] = (byte)0xf9; long keys = 0; long start = System.currentTimeMillis(); kloop: while (true) { rc5.setup(key); long pt = rc5.decrypt(ct) ^ iv; keys++; // this represents the string "The unkn" if (pt == 0x6e6b6e7520656854L) { // key has been found, but for this demo we'll keep searching //break; } int i = 0; while (++key[i] == 0) { i++; if (i >= 1) { long now = System.currentTimeMillis(); // terminate the demo after a reasonable amount of time if (now - start >= 30000) { break kloop; } if (i >= 2) { Host.updateStats(keys, now - start, false); } } if (i >= key.length) { break kloop; } } } long end = System.currentTimeMillis(); Host.updateStats(keys, end - start, true); } } </pre>