+/* Copyright (c) 1998,2011,2014 Apple Inc. All Rights Reserved.
+ *
+ * NOTICE: USE OF THE MATERIALS ACCOMPANYING THIS NOTICE IS SUBJECT
+ * TO THE TERMS OF THE SIGNED "FAST ELLIPTIC ENCRYPTION (FEE) REFERENCE
+ * SOURCE CODE EVALUATION AGREEMENT" BETWEEN APPLE, INC. AND THE
+ * ORIGINAL LICENSEE THAT OBTAINED THESE MATERIALS FROM APPLE,
+ * INC. ANY USE OF THESE MATERIALS NOT PERMITTED BY SUCH AGREEMENT WILL
+ * EXPOSE YOU TO LIABILITY.
+ ***************************************************************************
+ *
+ * DES.c - raw DES encryption engine
+ *
+ * Revision History
+ * ----------------
+ * Added braces to static array definition of si[][].
+ * 10/06/98 ap
+ * Changed to compile with C++.
+ * 28 May 98 at Apple
+ * Changed to use platform-dependent fmalloc(), ffree()
+ * 31 Mar 97 at Apple
+ * Put per-instance data in struct _desInst
+ * Changed setkey() to dessetkey() to avoid collision with libc version
+ * 21 Aug 96 at NeXT
+ * Broke out from NSDESCryptor.m
+ * 22 Feb 96 at NeXT
+ * Created.
+ */
+
+#include "ckconfig.h"
+
+#if CRYPTKIT_SYMMETRIC_ENABLE
+
+#include "ckDES.h"
+#include "falloc.h"
+#include <stdlib.h>
+
+#ifndef NULL
+#define NULL ((void *)0)
+#endif /* NULL */
+
+#define DES_DEBUG 0 /* enables some printfs */
+
+/* Sofware DES functions
+ * written 12 Dec 1986 by Phil Karn, KA9Q; large sections adapted from
+ * the 1977 public-domain program by Jim Gillogly
+ */
+
+#ifdef __LITTLE_ENDIAN__
+/* Byte swap a long */
+static unsigned int byteswap(unsigned int x) {
+ register char *cp,tmp;
+
+ cp = (char *)&x;
+ tmp = cp[3];
+ cp[3] = cp[0];
+ cp[0] = tmp;
+
+ tmp = cp[2];
+ cp[2] = cp[1];
+ cp[1] = tmp;
+
+ return x;
+}
+#endif
+
+/* Tables defined in the Data Encryption Standard documents */
+
+/* initial permutation IP */
+static const char ip[] = {
+ 58, 50, 42, 34, 26, 18, 10, 2,
+ 60, 52, 44, 36, 28, 20, 12, 4,
+ 62, 54, 46, 38, 30, 22, 14, 6,
+ 64, 56, 48, 40, 32, 24, 16, 8,
+ 57, 49, 41, 33, 25, 17, 9, 1,
+ 59, 51, 43, 35, 27, 19, 11, 3,
+ 61, 53, 45, 37, 29, 21, 13, 5,
+ 63, 55, 47, 39, 31, 23, 15, 7
+};
+
+/* final permutation IP^-1 */
+static const char fp[] = {
+ 40, 8, 48, 16, 56, 24, 64, 32,
+ 39, 7, 47, 15, 55, 23, 63, 31,
+ 38, 6, 46, 14, 54, 22, 62, 30,
+ 37, 5, 45, 13, 53, 21, 61, 29,
+ 36, 4, 44, 12, 52, 20, 60, 28,
+ 35, 3, 43, 11, 51, 19, 59, 27,
+ 34, 2, 42, 10, 50, 18, 58, 26,
+ 33, 1, 41, 9, 49, 17, 57, 25
+};
+
+/* expansion operation matrix
+ * This is for reference only; it is unused in the code
+ * as the f() function performs it implicitly for speed
+ */
+#ifdef notdef
+static char ei[] = {
+ 32, 1, 2, 3, 4, 5,
+ 4, 5, 6, 7, 8, 9,
+ 8, 9, 10, 11, 12, 13,
+ 12, 13, 14, 15, 16, 17,
+ 16, 17, 18, 19, 20, 21,
+ 20, 21, 22, 23, 24, 25,
+ 24, 25, 26, 27, 28, 29,
+ 28, 29, 30, 31, 32, 1
+};
+#endif
+
+/* permuted choice table (key) */
+static const char pc1[] = {
+ 57, 49, 41, 33, 25, 17, 9,
+ 1, 58, 50, 42, 34, 26, 18,
+ 10, 2, 59, 51, 43, 35, 27,
+ 19, 11, 3, 60, 52, 44, 36,
+
+ 63, 55, 47, 39, 31, 23, 15,
+ 7, 62, 54, 46, 38, 30, 22,
+ 14, 6, 61, 53, 45, 37, 29,
+ 21, 13, 5, 28, 20, 12, 4
+};
+
+/* number left rotations of pc1 */
+static const char totrot[] = {
+ 1,2,4,6,8,10,12,14,15,17,19,21,23,25,27,28
+};
+
+/* permuted choice key (table) */
+static const char pc2[] = {
+ 14, 17, 11, 24, 1, 5,
+ 3, 28, 15, 6, 21, 10,
+ 23, 19, 12, 4, 26, 8,
+ 16, 7, 27, 20, 13, 2,
+ 41, 52, 31, 37, 47, 55,
+ 30, 40, 51, 45, 33, 48,
+ 44, 49, 39, 56, 34, 53,
+ 46, 42, 50, 36, 29, 32
+};
+
+/* The (in)famous S-boxes */
+static const char si[8][64] = {
+ {
+ /* S1 */
+ 14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,
+ 0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8,
+ 4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0,
+ 15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13
+ },
+ {
+ /* S2 */
+ 15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,
+ 3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,
+ 0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15,
+ 13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9
+ },
+ {
+ /* S3 */
+ 10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8,
+ 13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1,
+ 13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7,
+ 1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12
+ },
+ {
+ /* S4 */
+ 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15,
+ 13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9,
+ 10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4,
+ 3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14
+ },
+ {
+ /* S5 */
+ 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9,
+ 14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6,
+ 4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14,
+ 11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3
+ },
+ {
+ /* S6 */
+ 12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11,
+ 10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8,
+ 9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6,
+ 4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13
+ },
+ {
+ /* S7 */
+ 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1,
+ 13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6,
+ 1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2,
+ 6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12
+ },
+ {
+ /* S8 */
+ 13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7,
+ 1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2,
+ 7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8,
+ 2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11
+ }
+};
+
+/* 32-bit permutation function P used on the output of the S-boxes */
+static const char p32i[] = {
+ 16, 7, 20, 21,
+ 29, 12, 28, 17,
+ 1, 15, 23, 26,
+ 5, 18, 31, 10,
+ 2, 8, 24, 14,
+ 32, 27, 3, 9,
+ 19, 13, 30, 6,
+ 22, 11, 4, 25
+};
+/* End of DES-defined tables */
+
+/* Lookup tables initialized once only at startup by desinit() */
+static long (*sp)[64]; /* Combined S and P boxes */
+
+static char (*iperm)[16][8]; /* Initial and final permutations */
+static char (*fperm)[16][8];
+
+
+/* bit 0 is left-most in byte */
+static const int bytebit[] = {
+ 0200,0100,040,020,010,04,02,01
+};
+
+static const int nibblebit[] = {
+ 010,04,02,01
+};
+
+/* Allocate space and initialize DES lookup arrays
+ * mode == 0: standard Data Encryption Algorithm
+ * mode == 1: DEA without initial and final permutations for speed
+ * mode == 2: DEA without permutations and with 128-byte key (completely
+ * independent subkeys for each round)
+ */
+/* Initialize the lookup table for the combined S and P boxes */
+static void spinit() {
+ char pbox[32];
+ int p,i,s,j,rowcol;
+ long val;
+
+ /* Compute pbox, the inverse of p32i.
+ * This is easier to work with
+ */
+ for(p=0;p<32;p++){
+ for(i=0;i<32;i++){
+ if(p32i[i]-1 == p){
+ pbox[p] = i;
+ break;
+ }
+ }
+ }
+ for(s = 0; s < 8; s++){ /* For each S-box */
+ for(i=0; i<64; i++){ /* For each possible input */
+ val = 0;
+ /* The row number is formed from the first and last
+ * bits; the column number is from the middle 4
+ */
+ rowcol = (i & 32) | ((i & 1) ? 16 : 0) | ((i >> 1) & 0xf);
+ for(j=0;j<4;j++){ /* For each output bit */
+ if(si[s][rowcol] & (8 >> j)){
+ val |= 1L << (31 - pbox[4*s + j]);
+ }
+ }
+ sp[s][i] = val;
+
+#if DES_DEBUG
+ printf("sp[%d][%2d] = %08lx\n",s,i,sp[s][i]);
+#endif
+ }
+ }
+}
+
+/* initialize a perm array */
+static void perminit(char perm[16][16][8], const char p[64]) {
+ register int l, j, k;
+ int i,m;
+
+ /* Clear the permutation array */
+ for (i=0; i<16; i++)
+ for (j=0; j<16; j++)
+ for (k=0; k<8; k++)
+ perm[i][j][k]=0;
+
+ for (i=0; i<16; i++) /* each input nibble position */
+ for (j = 0; j < 16; j++)/* each possible input nibble */
+ for (k = 0; k < 64; k++)/* each output bit position */
+ { l = p[k] - 1; /* where does this bit come from*/
+ if ((l >> 2) != i) /* does it come from input posn?*/
+ continue; /* if not, bit k is 0 */
+ if (!(j & nibblebit[l & 3]))
+ continue; /* any such bit in input? */
+ m = k & 07; /* which bit is this in the byte*/
+ perm[i][j][k>>3] |= bytebit[m];
+ }
+}
+
+int desinit(desInst dinst, int mode) {
+ dinst->desmode = mode;
+
+ /*
+ * Remainder only has to be done once.
+ */
+ if(sp != NULL){
+ /* Already initialized */
+ return 0;
+ }
+ if((sp = (long (*)[64])fmalloc(sizeof(long) * 8 * 64)) == NULL){
+ return -1;
+ }
+ spinit();
+ if(mode == 1 || mode == 2) /* No permutations */
+ return 0;
+
+ iperm = (char (*)[16][8])fmalloc(sizeof(char) * 16 * 16 * 8);
+ if(iperm == NULL){
+ ffree((char *)sp);
+ return -1;
+ }
+ perminit(iperm,ip);
+
+ fperm = (char (*)[16][8])fmalloc(sizeof(char) * 16 * 16 * 8);
+ if(fperm == NULL){
+ ffree((char *)sp);
+ ffree((char *)iperm);
+ return -1;
+ }
+ perminit(fperm,fp);
+
+ return 0;
+}
+/* Free up storage used by DES */
+void desdone(desInst dinst) {
+#if 0
+ /*
+ * no per-instance mallocd data
+ */
+ if(sp == NULL)
+ return; /* Already done */
+
+ // free((char *)sp); // NO! just free instance data; leave statics
+ // since these are consts
+ ffree((char *)dinst->kn);
+ //if(iperm != NULL)
+ // free((char *)iperm);
+ //if(fperm != NULL)
+ // free((char *)fperm);
+
+ //sp = NULL;
+ //iperm = NULL;
+ //fperm = NULL;
+ dinst->kn = NULL;
+#endif /* 0 */
+}
+/* Set key (initialize key schedule array) */
+void dessetkey(desInst dinst, char *key) {
+ char pc1m[56]; /* place to modify pc1 into */
+ char pcr[56]; /* place to rotate pc1 into */
+ register int i,j,l;
+ int m;
+
+ /* In mode 2, the 128 bytes of subkey are set directly from the
+ * user's key, allowing him to use completely independent
+ * subkeys for each round. Note that the user MUST specify a
+ * full 128 bytes.
+ *
+ * I would like to think that this technique gives the NSA a real
+ * headache, but I'm not THAT naive.
+ */
+ if(dinst->desmode == 2){
+ for(i=0;i<16;i++)
+ for(j=0;j<8;j++)
+ dinst->kn[i][j] = *key++;
+ return;
+ }
+ /* Clear key schedule */
+ for (i=0; i<16; i++)
+ for (j=0; j<8; j++)
+ dinst->kn[i][j]=0;
+
+ for (j=0; j<56; j++) { /* convert pc1 to bits of key */
+ l=pc1[j]-1; /* integer bit location */
+ m = l & 07; /* find bit */
+ pc1m[j]=(key[l>>3] & /* find which key byte l is in */
+ bytebit[m]) /* and which bit of that byte */
+ ? 1 : 0; /* and store 1-bit result */
+ }
+ for (i=0; i<16; i++) { /* key chunk for each iteration */
+ for (j=0; j<56; j++) /* rotate pc1 the right amount */
+ pcr[j] = pc1m[(l=j+totrot[i])<(j<28? 28 : 56) ? l: l-28];
+ /* rotate left and right halves independently */
+ for (j=0; j<48; j++){ /* select bits individually */
+ /* check bit that goes to dinst->kn[j] */
+ if (pcr[pc2[j]-1]){
+ /* mask it in if it's there */
+ l= j % 6;
+ dinst->kn[i][j/6] |= bytebit[l] >> 2;
+ }
+ }
+ }
+#if DES_DEBUG
+ for(i=0;i<16;i++) {
+ printf("dinst->kn[%d] = ", i);
+ for(j=0;j<8;j++) {
+ printf("%x ", dinst->kn[i][j]);
+ }
+ printf("\n");
+ }
+
+#endif /* 1 */
+}
+
+/* The nonlinear function f(r,k), the heart of DES */
+static long int f(unsigned long r, unsigned char subkey[8]) {
+ /* 32 bits */
+ /* 48-bit key for this round */
+ register unsigned long rval,rt;
+#if DES_DEBUG
+ printf("f(%08lx, %02x %02x %02x %02x %02x %02x %02x %02x) = ",
+ r,
+ subkey[0], subkey[1], subkey[2],
+ subkey[3], subkey[4], subkey[5],
+ subkey[6], subkey[7]);
+#endif
+ /* Run E(R) ^ K through the combined S & P boxes
+ * This code takes advantage of a convenient regularity in
+ * E, namely that each group of 6 bits in E(R) feeding
+ * a single S-box is a contiguous segment of R.
+ */
+ rt = (r >> 1) | ((r & 1) ? 0x80000000 : 0);
+ rval = 0;
+ rval |= sp[0][((rt >> 26) ^ *subkey++) & 0x3f];
+ rval |= sp[1][((rt >> 22) ^ *subkey++) & 0x3f];
+ rval |= sp[2][((rt >> 18) ^ *subkey++) & 0x3f];
+ rval |= sp[3][((rt >> 14) ^ *subkey++) & 0x3f];
+ rval |= sp[4][((rt >> 10) ^ *subkey++) & 0x3f];
+ rval |= sp[5][((rt >> 6) ^ *subkey++) & 0x3f];
+ rval |= sp[6][((rt >> 2) ^ *subkey++) & 0x3f];
+ rt = (r << 1) | ((r & 0x80000000) ? 1 : 0);
+ rval |= sp[7][(rt ^ *subkey) & 0x3f];
+#if DES_DEBUG
+ printf(" %08lx\n",rval);
+#endif
+ return rval;
+}
+
+/* Do one DES cipher round */
+static void round(desInst dinst, int num, unsigned long int *block) {
+ /* i.e. the num-th one */
+
+ /* The rounds are numbered from 0 to 15. On even rounds
+ * the right half is fed to f() and the result exclusive-ORs
+ * the left half; on odd rounds the reverse is done.
+ */
+ if(num & 1){
+ block[1] ^= f(block[0],dinst->kn[num]);
+ } else {
+ block[0] ^= f(block[1],dinst->kn[num]);
+ }
+}
+
+/* Permute inblock with perm */
+static void permute(char *inblock, char perm[16][16][8], char *outblock) {
+ /* result into outblock,64 bits */
+ /* 2K bytes defining perm. */
+ register int i,j;
+ register char *ib, *ob; /* ptr to input or output block */
+ register char *p, *q;
+
+ if(perm == NULL){
+ /* No permutation, just copy */
+ for(i=8; i!=0; i--)
+ *outblock++ = *inblock++;
+ return;
+ }
+ /* Clear output block */
+ for (i=8, ob = outblock; i != 0; i--)
+ *ob++ = 0;
+
+ ib = inblock;
+ for (j = 0; j < 16; j += 2, ib++) { /* for each input nibble */
+ ob = outblock;
+ p = perm[j][(*ib >> 4) & 017];
+ q = perm[j + 1][*ib & 017];
+ for (i = 8; i != 0; i--){ /* and each output byte */
+ *ob++ |= *p++ | *q++; /* OR the masks together*/
+ }
+ }
+}
+/* In-place encryption of 64-bit block */
+void endes(desInst dinst, char *block) {
+ register int i;
+ unsigned long work[2]; /* Working data storage */
+ long tmp;
+
+ permute(block,iperm,(char *)work); /* Initial Permutation */
+#ifdef __LITTLE_ENDIAN__
+ work[0] = byteswap(work[0]);
+ work[1] = byteswap(work[1]);
+#endif
+
+ /* Do the 16 rounds */
+ for (i=0; i<16; i++)
+ round(dinst,i,work);
+
+ /* Left/right half swap */
+ tmp = work[0];
+ work[0] = work[1];
+ work[1] = tmp;
+
+#ifdef __LITTLE_ENDIAN__
+ work[0] = byteswap(work[0]);
+ work[1] = byteswap(work[1]);
+#endif
+ permute((char *)work,fperm,block); /* Inverse initial permutation */
+}
+/* In-place decryption of 64-bit block */
+void dedes(desInst dinst, char *block) {
+ register int i;
+ unsigned long work[2]; /* Working data storage */
+ long tmp;
+
+ permute(block,iperm,(char *)work); /* Initial permutation */
+
+#ifdef __LITTLE_ENDIAN__
+ work[0] = byteswap(work[0]);
+ work[1] = byteswap(work[1]);
+#endif
+
+ /* Left/right half swap */
+ tmp = work[0];
+ work[0] = work[1];
+ work[1] = tmp;
+
+ /* Do the 16 rounds in reverse order */
+ for (i=15; i >= 0; i--)
+ round(dinst,i,work);
+
+#ifdef __LITTLE_ENDIAN__
+ work[0] = byteswap(work[0]);
+ work[1] = byteswap(work[1]);
+#endif
+
+ permute((char *)work,fperm,block); /* Inverse initial permutation */
+}
+
+#endif /* CRYPTKIT_SYMMETRIC_ENABLE */
projects / apple / security.git / blobdiff