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1.1 root 1: /* DESC.C - Data Encryption Standard routines for RSAREF
2: Based on "Karn/Hoey/Outerbridge" implementation (KHODES)
3: */
4:
5: #include "global.h"
6: #include "rsaref.h"
7: #include "des.h"
8:
9: static UINT2 BYTE_BIT[8] = {
10: 0200, 0100, 040, 020, 010, 04, 02, 01
11: };
12:
13: static UINT4 BIG_BYTE[24] = {
14: 0x800000L, 0x400000L, 0x200000L, 0x100000L,
15: 0x80000L, 0x40000L, 0x20000L, 0x10000L,
16: 0x8000L, 0x4000L, 0x2000L, 0x1000L,
17: 0x800L, 0x400L, 0x200L, 0x100L,
18: 0x80L, 0x40L, 0x20L, 0x10L,
19: 0x8L, 0x4L, 0x2L, 0x1L
20: };
21:
22: static unsigned char PC1[56] = {
23: 56, 48, 40, 32, 24, 16, 8, 0, 57, 49, 41, 33, 25, 17,
24: 9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35,
25: 62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21,
26: 13, 5, 60, 52, 44, 36, 28, 20, 12, 4, 27, 19, 11, 3
27: };
28:
29: static unsigned char TOTAL_ROTATIONS[16] = {
30: 1, 2, 4, 6, 8, 10, 12, 14, 15, 17, 19, 21, 23, 25, 27, 28
31: };
32:
33: static unsigned char PC2[48] = {
34: 13, 16, 10, 23, 0, 4, 2, 27, 14, 5, 20, 9,
35: 22, 18, 11, 3, 25, 7, 15, 6, 26, 19, 12, 1,
36: 40, 51, 30, 36, 46, 54, 29, 39, 50, 44, 32, 47,
37: 43, 48, 38, 55, 33, 52, 45, 41, 49, 35, 28, 31
38: };
39:
40: static UINT4 SP1[64] = {
41: 0x01010400L, 0x00000000L, 0x00010000L, 0x01010404L,
42: 0x01010004L, 0x00010404L, 0x00000004L, 0x00010000L,
43: 0x00000400L, 0x01010400L, 0x01010404L, 0x00000400L,
44: 0x01000404L, 0x01010004L, 0x01000000L, 0x00000004L,
45: 0x00000404L, 0x01000400L, 0x01000400L, 0x00010400L,
46: 0x00010400L, 0x01010000L, 0x01010000L, 0x01000404L,
47: 0x00010004L, 0x01000004L, 0x01000004L, 0x00010004L,
48: 0x00000000L, 0x00000404L, 0x00010404L, 0x01000000L,
49: 0x00010000L, 0x01010404L, 0x00000004L, 0x01010000L,
50: 0x01010400L, 0x01000000L, 0x01000000L, 0x00000400L,
51: 0x01010004L, 0x00010000L, 0x00010400L, 0x01000004L,
52: 0x00000400L, 0x00000004L, 0x01000404L, 0x00010404L,
53: 0x01010404L, 0x00010004L, 0x01010000L, 0x01000404L,
54: 0x01000004L, 0x00000404L, 0x00010404L, 0x01010400L,
55: 0x00000404L, 0x01000400L, 0x01000400L, 0x00000000L,
56: 0x00010004L, 0x00010400L, 0x00000000L, 0x01010004L
57: };
58:
59: static UINT4 SP2[64] = {
60: 0x80108020L, 0x80008000L, 0x00008000L, 0x00108020L,
61: 0x00100000L, 0x00000020L, 0x80100020L, 0x80008020L,
62: 0x80000020L, 0x80108020L, 0x80108000L, 0x80000000L,
63: 0x80008000L, 0x00100000L, 0x00000020L, 0x80100020L,
64: 0x00108000L, 0x00100020L, 0x80008020L, 0x00000000L,
65: 0x80000000L, 0x00008000L, 0x00108020L, 0x80100000L,
66: 0x00100020L, 0x80000020L, 0x00000000L, 0x00108000L,
67: 0x00008020L, 0x80108000L, 0x80100000L, 0x00008020L,
68: 0x00000000L, 0x00108020L, 0x80100020L, 0x00100000L,
69: 0x80008020L, 0x80100000L, 0x80108000L, 0x00008000L,
70: 0x80100000L, 0x80008000L, 0x00000020L, 0x80108020L,
71: 0x00108020L, 0x00000020L, 0x00008000L, 0x80000000L,
72: 0x00008020L, 0x80108000L, 0x00100000L, 0x80000020L,
73: 0x00100020L, 0x80008020L, 0x80000020L, 0x00100020L,
74: 0x00108000L, 0x00000000L, 0x80008000L, 0x00008020L,
75: 0x80000000L, 0x80100020L, 0x80108020L, 0x00108000L
76: };
77:
78: static UINT4 SP3[64] = {
79: 0x00000208L, 0x08020200L, 0x00000000L, 0x08020008L,
80: 0x08000200L, 0x00000000L, 0x00020208L, 0x08000200L,
81: 0x00020008L, 0x08000008L, 0x08000008L, 0x00020000L,
82: 0x08020208L, 0x00020008L, 0x08020000L, 0x00000208L,
83: 0x08000000L, 0x00000008L, 0x08020200L, 0x00000200L,
84: 0x00020200L, 0x08020000L, 0x08020008L, 0x00020208L,
85: 0x08000208L, 0x00020200L, 0x00020000L, 0x08000208L,
86: 0x00000008L, 0x08020208L, 0x00000200L, 0x08000000L,
87: 0x08020200L, 0x08000000L, 0x00020008L, 0x00000208L,
88: 0x00020000L, 0x08020200L, 0x08000200L, 0x00000000L,
89: 0x00000200L, 0x00020008L, 0x08020208L, 0x08000200L,
90: 0x08000008L, 0x00000200L, 0x00000000L, 0x08020008L,
91: 0x08000208L, 0x00020000L, 0x08000000L, 0x08020208L,
92: 0x00000008L, 0x00020208L, 0x00020200L, 0x08000008L,
93: 0x08020000L, 0x08000208L, 0x00000208L, 0x08020000L,
94: 0x00020208L, 0x00000008L, 0x08020008L, 0x00020200L
95: };
96:
97: static UINT4 SP4[64] = {
98: 0x00802001L, 0x00002081L, 0x00002081L, 0x00000080L,
99: 0x00802080L, 0x00800081L, 0x00800001L, 0x00002001L,
100: 0x00000000L, 0x00802000L, 0x00802000L, 0x00802081L,
101: 0x00000081L, 0x00000000L, 0x00800080L, 0x00800001L,
102: 0x00000001L, 0x00002000L, 0x00800000L, 0x00802001L,
103: 0x00000080L, 0x00800000L, 0x00002001L, 0x00002080L,
104: 0x00800081L, 0x00000001L, 0x00002080L, 0x00800080L,
105: 0x00002000L, 0x00802080L, 0x00802081L, 0x00000081L,
106: 0x00800080L, 0x00800001L, 0x00802000L, 0x00802081L,
107: 0x00000081L, 0x00000000L, 0x00000000L, 0x00802000L,
108: 0x00002080L, 0x00800080L, 0x00800081L, 0x00000001L,
109: 0x00802001L, 0x00002081L, 0x00002081L, 0x00000080L,
110: 0x00802081L, 0x00000081L, 0x00000001L, 0x00002000L,
111: 0x00800001L, 0x00002001L, 0x00802080L, 0x00800081L,
112: 0x00002001L, 0x00002080L, 0x00800000L, 0x00802001L,
113: 0x00000080L, 0x00800000L, 0x00002000L, 0x00802080L
114: };
115:
116: static UINT4 SP5[64] = {
117: 0x00000100L, 0x02080100L, 0x02080000L, 0x42000100L,
118: 0x00080000L, 0x00000100L, 0x40000000L, 0x02080000L,
119: 0x40080100L, 0x00080000L, 0x02000100L, 0x40080100L,
120: 0x42000100L, 0x42080000L, 0x00080100L, 0x40000000L,
121: 0x02000000L, 0x40080000L, 0x40080000L, 0x00000000L,
122: 0x40000100L, 0x42080100L, 0x42080100L, 0x02000100L,
123: 0x42080000L, 0x40000100L, 0x00000000L, 0x42000000L,
124: 0x02080100L, 0x02000000L, 0x42000000L, 0x00080100L,
125: 0x00080000L, 0x42000100L, 0x00000100L, 0x02000000L,
126: 0x40000000L, 0x02080000L, 0x42000100L, 0x40080100L,
127: 0x02000100L, 0x40000000L, 0x42080000L, 0x02080100L,
128: 0x40080100L, 0x00000100L, 0x02000000L, 0x42080000L,
129: 0x42080100L, 0x00080100L, 0x42000000L, 0x42080100L,
130: 0x02080000L, 0x00000000L, 0x40080000L, 0x42000000L,
131: 0x00080100L, 0x02000100L, 0x40000100L, 0x00080000L,
132: 0x00000000L, 0x40080000L, 0x02080100L, 0x40000100L
133: };
134:
135: static UINT4 SP6[64] = {
136: 0x20000010L, 0x20400000L, 0x00004000L, 0x20404010L,
137: 0x20400000L, 0x00000010L, 0x20404010L, 0x00400000L,
138: 0x20004000L, 0x00404010L, 0x00400000L, 0x20000010L,
139: 0x00400010L, 0x20004000L, 0x20000000L, 0x00004010L,
140: 0x00000000L, 0x00400010L, 0x20004010L, 0x00004000L,
141: 0x00404000L, 0x20004010L, 0x00000010L, 0x20400010L,
142: 0x20400010L, 0x00000000L, 0x00404010L, 0x20404000L,
143: 0x00004010L, 0x00404000L, 0x20404000L, 0x20000000L,
144: 0x20004000L, 0x00000010L, 0x20400010L, 0x00404000L,
145: 0x20404010L, 0x00400000L, 0x00004010L, 0x20000010L,
146: 0x00400000L, 0x20004000L, 0x20000000L, 0x00004010L,
147: 0x20000010L, 0x20404010L, 0x00404000L, 0x20400000L,
148: 0x00404010L, 0x20404000L, 0x00000000L, 0x20400010L,
149: 0x00000010L, 0x00004000L, 0x20400000L, 0x00404010L,
150: 0x00004000L, 0x00400010L, 0x20004010L, 0x00000000L,
151: 0x20404000L, 0x20000000L, 0x00400010L, 0x20004010L
152: };
153:
154: static UINT4 SP7[64] = {
155: 0x00200000L, 0x04200002L, 0x04000802L, 0x00000000L,
156: 0x00000800L, 0x04000802L, 0x00200802L, 0x04200800L,
157: 0x04200802L, 0x00200000L, 0x00000000L, 0x04000002L,
158: 0x00000002L, 0x04000000L, 0x04200002L, 0x00000802L,
159: 0x04000800L, 0x00200802L, 0x00200002L, 0x04000800L,
160: 0x04000002L, 0x04200000L, 0x04200800L, 0x00200002L,
161: 0x04200000L, 0x00000800L, 0x00000802L, 0x04200802L,
162: 0x00200800L, 0x00000002L, 0x04000000L, 0x00200800L,
163: 0x04000000L, 0x00200800L, 0x00200000L, 0x04000802L,
164: 0x04000802L, 0x04200002L, 0x04200002L, 0x00000002L,
165: 0x00200002L, 0x04000000L, 0x04000800L, 0x00200000L,
166: 0x04200800L, 0x00000802L, 0x00200802L, 0x04200800L,
167: 0x00000802L, 0x04000002L, 0x04200802L, 0x04200000L,
168: 0x00200800L, 0x00000000L, 0x00000002L, 0x04200802L,
169: 0x00000000L, 0x00200802L, 0x04200000L, 0x00000800L,
170: 0x04000002L, 0x04000800L, 0x00000800L, 0x00200002L
171: };
172:
173: static UINT4 SP8[64] = {
174: 0x10001040L, 0x00001000L, 0x00040000L, 0x10041040L,
175: 0x10000000L, 0x10001040L, 0x00000040L, 0x10000000L,
176: 0x00040040L, 0x10040000L, 0x10041040L, 0x00041000L,
177: 0x10041000L, 0x00041040L, 0x00001000L, 0x00000040L,
178: 0x10040000L, 0x10000040L, 0x10001000L, 0x00001040L,
179: 0x00041000L, 0x00040040L, 0x10040040L, 0x10041000L,
180: 0x00001040L, 0x00000000L, 0x00000000L, 0x10040040L,
181: 0x10000040L, 0x10001000L, 0x00041040L, 0x00040000L,
182: 0x00041040L, 0x00040000L, 0x10041000L, 0x00001000L,
183: 0x00000040L, 0x10040040L, 0x00001000L, 0x00041040L,
184: 0x10001000L, 0x00000040L, 0x10000040L, 0x10040000L,
185: 0x10040040L, 0x10000000L, 0x00040000L, 0x10001040L,
186: 0x00000000L, 0x10041040L, 0x00040040L, 0x10000040L,
187: 0x10040000L, 0x10001000L, 0x10001040L, 0x00000000L,
188: 0x10041040L, 0x00041000L, 0x00041000L, 0x00001040L,
189: 0x00001040L, 0x00040040L, 0x10000000L, 0x10041000L
190: };
191:
192: static void Unpack PROTO_LIST ((unsigned char *, UINT4 *));
193: static void Pack PROTO_LIST ((UINT4 *, unsigned char *));
194: static void DESKey PROTO_LIST ((UINT4 *, unsigned char *, int));
195: static void CookKey PROTO_LIST ((UINT4 *, UINT4 *, int));
196: static void DESFunction PROTO_LIST ((UINT4 *, UINT4 *));
197:
198: /* Initialize context. Caller must zeroize the context when finished.
199: */
200: void DES_CBCInit (context, key, iv, encrypt)
201: DES_CBC_CTX *context; /* context */
202: unsigned char key[8]; /* key */
203: unsigned char iv[8]; /* initializing vector */
204: int encrypt; /* encrypt flag (1 = encrypt, 0 = decrypt) */
205: {
206: /* Copy encrypt flag to context.
207: */
208: context->encrypt = encrypt;
209:
210: /* Pack initializing vector into context.
211: */
212: Pack (context->iv, iv);
213:
214: /* Save the IV for use in Restart */
215: context->originalIV[0] = context->iv[0];
216: context->originalIV[1] = context->iv[1];
217:
218: /* Precompute key schedule
219: */
220: DESKey (context->subkeys, key, encrypt);
221: }
222:
223: /* DES-CBC block update operation. Continues a DES-CBC encryption
224: operation, processing eight-byte message blocks, and updating
225: the context.
226: */
227: int DES_CBCUpdate (context, output, input, len)
228: DES_CBC_CTX *context; /* context */
229: unsigned char *output; /* output block */
230: unsigned char *input; /* input block */
231: unsigned int len; /* length of input and output blocks */
232: {
233: UINT4 inputBlock[2], work[2];
234: unsigned int i;
235:
236: if (len % 8)
237: return (RE_LEN);
238:
239: for (i = 0; i < len/8; i++) {
240: Pack (inputBlock, &input[8*i]);
241:
242: /* Chain if encrypting.
243: */
244: if (context->encrypt) {
245: work[0] = inputBlock[0] ^ context->iv[0];
246: work[1] = inputBlock[1] ^ context->iv[1];
247: }
248: else {
249: work[0] = inputBlock[0];
250: work[1] = inputBlock[1];
251: }
252:
253: DESFunction (work, context->subkeys);
254:
255: /* Chain if decrypting, then update IV.
256: */
257: if (context->encrypt) {
258: context->iv[0] = work[0];
259: context->iv[1] = work[1];
260: }
261: else {
262: work[0] ^= context->iv[0];
263: work[1] ^= context->iv[1];
264: context->iv[0] = inputBlock[0];
265: context->iv[1] = inputBlock[1];
266: }
267: Unpack (&output[8*i], work);
268: }
269:
270: /* Zeroize sensitive information.
271: */
272: R_memset ((POINTER)inputBlock, 0, sizeof (inputBlock));
273: R_memset ((POINTER)work, 0, sizeof (work));
274:
275: return (0);
276: }
277:
278: void DES_CBCRestart (context)
279: DES_CBC_CTX *context;
280: {
281: /* Reset to the original IV */
282: context->iv[0] = context->originalIV[0];
283: context->iv[1] = context->originalIV[1];
284: }
285:
286: /* Initialize context. Caller must zeroize the context when finished.
287: The key has the DES key, input whitener and output whitener concatenated.
288: */
289: void DESX_CBCInit (context, key, iv, encrypt)
290: DESX_CBC_CTX *context;
291: unsigned char key[24]; /* DES key and whiteners */
292: unsigned char iv[8]; /* DES initializing vector */
293: int encrypt; /* encrypt flag (1 = encrypt, 0 = decrypt) */
294: {
295: /* Copy encrypt flag to context.
296: */
297: context->encrypt = encrypt;
298:
299: /* Pack initializing vector and whiteners into context.
300: */
301: Pack (context->iv, iv);
302: Pack (context->inputWhitener, key + 8);
303: Pack (context->outputWhitener, key + 16);
304:
305: /* Save the IV for use in Restart */
306: context->originalIV[0] = context->iv[0];
307: context->originalIV[1] = context->iv[1];
308:
309: /* Precompute key schedule.
310: */
311: DESKey (context->subkeys, key, encrypt);
312: }
313:
314: /* DESX-CBC block update operation. Continues a DESX-CBC encryption
315: operation, processing eight-byte message blocks, and updating
316: the context.
317: */
318: int DESX_CBCUpdate (context, output, input, len)
319: DESX_CBC_CTX *context; /* context */
320: unsigned char *output; /* output block */
321: unsigned char *input; /* input block */
322: unsigned int len; /* length of input and output blocks */
323: {
324: UINT4 inputBlock[2], work[2];
325: unsigned int i;
326:
327: if (len % 8)
328: return (RE_LEN);
329:
330: for (i = 0; i < len/8; i++) {
331: Pack (inputBlock, &input[8*i]);
332:
333: /* Chain if encrypting, and xor with whitener.
334: */
335: if (context->encrypt) {
336: work[0] =
337: inputBlock[0] ^ context->iv[0] ^ context->inputWhitener[0];
338: work[1] =
339: inputBlock[1] ^ context->iv[1] ^ context->inputWhitener[1];
340: }
341: else {
342: work[0] = inputBlock[0] ^ context->outputWhitener[0];
343: work[1] = inputBlock[1] ^ context->outputWhitener[1];
344: }
345:
346: DESFunction (work, context->subkeys);
347:
348: /* Xor with whitener, chain if decrypting, then update IV.
349: */
350: if (context->encrypt) {
351: work[0] ^= context->outputWhitener[0];
352: work[1] ^= context->outputWhitener[1];
353: context->iv[0] = work[0];
354: context->iv[1] = work[1];
355: }
356: else {
357: work[0] ^= context->iv[0] ^ context->inputWhitener[0];
358: work[1] ^= context->iv[1] ^ context->inputWhitener[1];
359: context->iv[0] = inputBlock[0];
360: context->iv[1] = inputBlock[1];
361: }
362: Unpack (&output[8*i], work);
363: }
364:
365: /* Zeroize sensitive information.
366: */
367: R_memset ((POINTER)inputBlock, 0, sizeof (inputBlock));
368: R_memset ((POINTER)work, 0, sizeof (work));
369:
370: return (0);
371: }
372:
373: void DESX_CBCRestart (context)
374: DESX_CBC_CTX *context;
375: {
376: /* Reset to the original IV */
377: context->iv[0] = context->originalIV[0];
378: context->iv[1] = context->originalIV[1];
379: }
380:
381: /* Initialize context. Caller must zeroize the context when finished.
382: */
383: void DES3_CBCInit(context, key, iv, encrypt)
384: DES3_CBC_CTX *context; /* context */
385: unsigned char key[24]; /* key */
386: unsigned char iv[8]; /* initializing vector */
387: int encrypt; /* encrypt flag (1 = encrypt, 0 = decrypt) */
388: {
389: /* Copy encrypt flag to context.
390: */
391: context->encrypt = encrypt;
392:
393: /* Pack initializing vector into context.
394: */
395: Pack (context->iv, iv);
396:
397: /* Save the IV for use in Restart */
398: context->originalIV[0] = context->iv[0];
399: context->originalIV[1] = context->iv[1];
400:
401: /* Precompute key schedules.
402: */
403: DESKey (context->subkeys[0], encrypt ? key : &key[16], encrypt);
404: DESKey (context->subkeys[1], &key[8], !encrypt);
405: DESKey (context->subkeys[2], encrypt ? &key[16] : key, encrypt);
406: }
407:
408: int DES3_CBCUpdate (context, output, input, len)
409: DES3_CBC_CTX *context; /* context */
410: unsigned char *output; /* output block */
411: unsigned char *input; /* input block */
412: unsigned int len; /* length of input and output blocks */
413: {
414: UINT4 inputBlock[2], work[2];
415: unsigned int i;
416:
417: if (len % 8)
418: return (RE_LEN);
419:
420: for (i = 0; i < len/8; i++) {
421: Pack (inputBlock, &input[8*i]);
422:
423: /* Chain if encrypting.
424: */
425: if (context->encrypt) {
426: work[0] = inputBlock[0] ^ context->iv[0];
427: work[1] = inputBlock[1] ^ context->iv[1];
428: }
429: else {
430: work[0] = inputBlock[0];
431: work[1] = inputBlock[1];
432: }
433:
434: DESFunction (work, context->subkeys[0]);
435: DESFunction (work, context->subkeys[1]);
436: DESFunction (work, context->subkeys[2]);
437:
438: /* Chain if decrypting, then update IV.
439: */
440: if (context->encrypt) {
441: context->iv[0] = work[0];
442: context->iv[1] = work[1];
443: }
444: else {
445: work[0] ^= context->iv[0];
446: work[1] ^= context->iv[1];
447: context->iv[0] = inputBlock[0];
448: context->iv[1] = inputBlock[1];
449: }
450: Unpack (&output[8*i], work);
451: }
452:
453: /* Zeroize sensitive information.
454: */
455: R_memset ((POINTER)inputBlock, 0, sizeof (inputBlock));
456: R_memset ((POINTER)work, 0, sizeof (work));
457:
458: return (0);
459: }
460:
461: void DES3_CBCRestart (context)
462: DES3_CBC_CTX *context;
463: {
464: /* Reset to the original IV */
465: context->iv[0] = context->originalIV[0];
466: context->iv[1] = context->originalIV[1];
467: }
468:
469: static void Pack (into, outof)
470: UINT4 *into;
471: unsigned char *outof;
472: {
473: *into = (*outof++ & 0xffL) << 24;
474: *into |= (*outof++ & 0xffL) << 16;
475: *into |= (*outof++ & 0xffL) << 8;
476: *into++ |= (*outof++ & 0xffL);
477: *into = (*outof++ & 0xffL) << 24;
478: *into |= (*outof++ & 0xffL) << 16;
479: *into |= (*outof++ & 0xffL) << 8;
480: *into |= (*outof & 0xffL);
481: }
482:
483: static void Unpack (into, outof)
484: unsigned char *into;
485: UINT4 *outof;
486: {
487: *into++ = (unsigned char)((*outof >> 24) & 0xffL);
488: *into++ = (unsigned char)((*outof >> 16) & 0xffL);
489: *into++ = (unsigned char)((*outof >> 8) & 0xffL);
490: *into++ = (unsigned char)( *outof++ & 0xffL);
491: *into++ = (unsigned char)((*outof >> 24) & 0xffL);
492: *into++ = (unsigned char)((*outof >> 16) & 0xffL);
493: *into++ = (unsigned char)((*outof >> 8) & 0xffL);
494: *into = (unsigned char)( *outof & 0xffL);
495: }
496:
497: static void DESKey (subkeys, key, encrypt)
498: UINT4 subkeys[32];
499: unsigned char key[8];
500: int encrypt;
501: {
502: UINT4 kn[32];
503: int i, j, l, m, n;
504: unsigned char pc1m[56], pcr[56];
505:
506: for (j = 0; j < 56; j++) {
507: l = PC1[j];
508: m = l & 07;
509: pc1m[j] = (unsigned char)((key[l >> 3] & BYTE_BIT[m]) ? 1 : 0);
510: }
511: for (i = 0; i < 16; i++) {
512: m = i << 1;
513: n = m + 1;
514: kn[m] = kn[n] = 0L;
515: for (j = 0; j < 28; j++) {
516: l = j + TOTAL_ROTATIONS[i];
517: if (l < 28)
518: pcr[j] = pc1m[l];
519: else
520: pcr[j] = pc1m[l - 28];
521: }
522: for (j = 28; j < 56; j++) {
523: l = j + TOTAL_ROTATIONS[i];
524: if (l < 56)
525: pcr[j] = pc1m[l];
526: else
527: pcr[j] = pc1m[l - 28];
528: }
529: for (j = 0; j < 24; j++) {
530: if (pcr[PC2[j]])
531: kn[m] |= BIG_BYTE[j];
532: if (pcr[PC2[j+24]])
533: kn[n] |= BIG_BYTE[j];
534: }
535: }
536: CookKey (subkeys, kn, encrypt);
537:
538: /* Zeroize sensitive information.
539: */
540: R_memset ((POINTER)pc1m, 0, sizeof (pc1m));
541: R_memset ((POINTER)pcr, 0, sizeof (pcr));
542: R_memset ((POINTER)kn, 0, sizeof (kn));
543: }
544:
545: static void CookKey (subkeys, kn, encrypt)
546: UINT4 *subkeys;
547: UINT4 *kn;
548: int encrypt;
549: {
550: UINT4 *cooked, *raw0, *raw1;
551: int increment;
552: unsigned int i;
553:
554: raw1 = kn;
555: cooked = encrypt ? subkeys : &subkeys[30];
556: increment = encrypt ? 1 : -3;
557:
558: for (i = 0; i < 16; i++, raw1++) {
559: raw0 = raw1++;
560: *cooked = (*raw0 & 0x00fc0000L) << 6;
561: *cooked |= (*raw0 & 0x00000fc0L) << 10;
562: *cooked |= (*raw1 & 0x00fc0000L) >> 10;
563: *cooked++ |= (*raw1 & 0x00000fc0L) >> 6;
564: *cooked = (*raw0 & 0x0003f000L) << 12;
565: *cooked |= (*raw0 & 0x0000003fL) << 16;
566: *cooked |= (*raw1 & 0x0003f000L) >> 4;
567: *cooked |= (*raw1 & 0x0000003fL);
568: cooked += increment;
569: }
570: }
571:
572: static void DESFunction (block, subkeys)
573: UINT4 *block;
574: UINT4 *subkeys;
575: {
576: register UINT4 fval, work, right, left;
577: register int round;
578:
579: left = block[0];
580: right = block[1];
581: work = ((left >> 4) ^ right) & 0x0f0f0f0fL;
582: right ^= work;
583: left ^= (work << 4);
584: work = ((left >> 16) ^ right) & 0x0000ffffL;
585: right ^= work;
586: left ^= (work << 16);
587: work = ((right >> 2) ^ left) & 0x33333333L;
588: left ^= work;
589: right ^= (work << 2);
590: work = ((right >> 8) ^ left) & 0x00ff00ffL;
591: left ^= work;
592: right ^= (work << 8);
593: right = ((right << 1) | ((right >> 31) & 1L)) & 0xffffffffL;
594: work = (left ^ right) & 0xaaaaaaaaL;
595: left ^= work;
596: right ^= work;
597: left = ((left << 1) | ((left >> 31) & 1L)) & 0xffffffffL;
598:
599: for (round = 0; round < 8; round++) {
600: work = (right << 28) | (right >> 4);
601: work ^= *subkeys++;
602: fval = SP7[ work & 0x3fL];
603: fval |= SP5[(work >> 8) & 0x3fL];
604: fval |= SP3[(work >> 16) & 0x3fL];
605: fval |= SP1[(work >> 24) & 0x3fL];
606: work = right ^ *subkeys++;
607: fval |= SP8[ work & 0x3fL];
608: fval |= SP6[(work >> 8) & 0x3fL];
609: fval |= SP4[(work >> 16) & 0x3fL];
610: fval |= SP2[(work >> 24) & 0x3fL];
611: left ^= fval;
612: work = (left << 28) | (left >> 4);
613: work ^= *subkeys++;
614: fval = SP7[ work & 0x3fL];
615: fval |= SP5[(work >> 8) & 0x3fL];
616: fval |= SP3[(work >> 16) & 0x3fL];
617: fval |= SP1[(work >> 24) & 0x3fL];
618: work = left ^ *subkeys++;
619: fval |= SP8[ work & 0x3fL];
620: fval |= SP6[(work >> 8) & 0x3fL];
621: fval |= SP4[(work >> 16) & 0x3fL];
622: fval |= SP2[(work >> 24) & 0x3fL];
623: right ^= fval;
624: }
625:
626: right = (right << 31) | (right >> 1);
627: work = (left ^ right) & 0xaaaaaaaaL;
628: left ^= work;
629: right ^= work;
630: left = (left << 31) | (left >> 1);
631: work = ((left >> 8) ^ right) & 0x00ff00ffL;
632: right ^= work;
633: left ^= (work << 8);
634: work = ((left >> 2) ^ right) & 0x33333333L;
635: right ^= work;
636: left ^= (work << 2);
637: work = ((right >> 16) ^ left) & 0x0000ffffL;
638: left ^= work;
639: right ^= (work << 16);
640: work = ((right >> 4) ^ left) & 0x0f0f0f0fL;
641: left ^= work;
642: right ^= (work << 4);
643: *block++ = right;
644: *block = left;
645: }
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