permute rc2_ecb_decrypt rc2_ecb_encrypt rc2_setup

void rc2_ecb_decrypt ( const unsigned char *  cipher, unsigned char *  plain, rc2_key *  rc2  ) Definition at line 159 of file rc2.c. Referenced by encrypt_block_impl(). { unsigned x76, x54, x32, x10; unsigned *xkey; int i; xkey = rc2->xkey; x76 = ((unsigned)cipher[7] << 8) + (unsigned)cipher[6]; x54 = ((unsigned)cipher[5] << 8) + (unsigned)cipher[4]; x32 = ((unsigned)cipher[3] << 8) + (unsigned)cipher[2]; x10 = ((unsigned)cipher[1] << 8) + (unsigned)cipher[0]; for (i = 15; i >= 0; i--) { if (i == 4 || i == 10) { x76 = (x76 - xkey[x54 & 63]) & 0xFFFF; x54 = (x54 - xkey[x32 & 63]) & 0xFFFF; x32 = (x32 - xkey[x10 & 63]) & 0xFFFF; x10 = (x10 - xkey[x76 & 63]) & 0xFFFF; } x76 = ((x76 << 11) | (x76 >> 5)); x76 = (x76 - ((x10 & ~x54) + (x32 & x54) + xkey[4*i+3])) & 0xFFFF; x54 = ((x54 << 13) | (x54 >> 3)); x54 = (x54 - ((x76 & ~x32) + (x10 & x32) + xkey[4*i+2])) & 0xFFFF; x32 = ((x32 << 14) | (x32 >> 2)); x32 = (x32 - ((x54 & ~x10) + (x76 & x10) + xkey[4*i+1])) & 0xFFFF; x10 = ((x10 << 15) | (x10 >> 1)); x10 = (x10 - ((x32 & ~x76) + (x54 & x76) + xkey[4*i+0])) & 0xFFFF; } plain[0] = (unsigned char)x10; plain[1] = (unsigned char)(x10 >> 8); plain[2] = (unsigned char)x32; plain[3] = (unsigned char)(x32 >> 8); plain[4] = (unsigned char)x54; plain[5] = (unsigned char)(x54 >> 8); plain[6] = (unsigned char)x76; plain[7] = (unsigned char)(x76 >> 8); }