1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/security/nss/lib/freebl/arcfour.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,573 @@
1.4 +/* arcfour.c - the arc four algorithm.
1.5 + *
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#ifdef FREEBL_NO_DEPEND
1.11 +#include "stubs.h"
1.12 +#endif
1.13 +
1.14 +#include "prerr.h"
1.15 +#include "secerr.h"
1.16 +
1.17 +#include "prtypes.h"
1.18 +#include "blapi.h"
1.19 +
1.20 +/* Architecture-dependent defines */
1.21 +
1.22 +#if defined(SOLARIS) || defined(HPUX) || defined(NSS_X86) || \
1.23 + defined(_WIN64)
1.24 +/* Convert the byte-stream to a word-stream */
1.25 +#define CONVERT_TO_WORDS
1.26 +#endif
1.27 +
1.28 +#if defined(AIX) || defined(OSF1) || defined(NSS_BEVAND_ARCFOUR)
1.29 +/* Treat array variables as words, not bytes, on CPUs that take
1.30 + * much longer to write bytes than to write words, or when using
1.31 + * assembler code that required it.
1.32 + */
1.33 +#define USE_WORD
1.34 +#endif
1.35 +
1.36 +#if defined(IS_64) || defined(NSS_BEVAND_ARCFOUR)
1.37 +typedef PRUint64 WORD;
1.38 +#else
1.39 +typedef PRUint32 WORD;
1.40 +#endif
1.41 +#define WORDSIZE sizeof(WORD)
1.42 +
1.43 +#if defined(USE_WORD)
1.44 +typedef WORD Stype;
1.45 +#else
1.46 +typedef PRUint8 Stype;
1.47 +#endif
1.48 +
1.49 +#define ARCFOUR_STATE_SIZE 256
1.50 +
1.51 +#define MASK1BYTE (WORD)(0xff)
1.52 +
1.53 +#define SWAP(a, b) \
1.54 + tmp = a; \
1.55 + a = b; \
1.56 + b = tmp;
1.57 +
1.58 +/*
1.59 + * State information for stream cipher.
1.60 + */
1.61 +struct RC4ContextStr
1.62 +{
1.63 +#if defined(NSS_ARCFOUR_IJ_B4_S) || defined(NSS_BEVAND_ARCFOUR)
1.64 + Stype i;
1.65 + Stype j;
1.66 + Stype S[ARCFOUR_STATE_SIZE];
1.67 +#else
1.68 + Stype S[ARCFOUR_STATE_SIZE];
1.69 + Stype i;
1.70 + Stype j;
1.71 +#endif
1.72 +};
1.73 +
1.74 +/*
1.75 + * array indices [0..255] to initialize cx->S array (faster than loop).
1.76 + */
1.77 +static const Stype Kinit[256] = {
1.78 + 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
1.79 + 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
1.80 + 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
1.81 + 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
1.82 + 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
1.83 + 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
1.84 + 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
1.85 + 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
1.86 + 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
1.87 + 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
1.88 + 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
1.89 + 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
1.90 + 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
1.91 + 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
1.92 + 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
1.93 + 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
1.94 + 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
1.95 + 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
1.96 + 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
1.97 + 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
1.98 + 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
1.99 + 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
1.100 + 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,
1.101 + 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
1.102 + 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
1.103 + 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
1.104 + 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
1.105 + 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
1.106 + 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
1.107 + 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
1.108 + 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
1.109 + 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff
1.110 +};
1.111 +
1.112 +RC4Context *
1.113 +RC4_AllocateContext(void)
1.114 +{
1.115 + return PORT_ZNew(RC4Context);
1.116 +}
1.117 +
1.118 +SECStatus
1.119 +RC4_InitContext(RC4Context *cx, const unsigned char *key, unsigned int len,
1.120 + const unsigned char * unused1, int unused2,
1.121 + unsigned int unused3, unsigned int unused4)
1.122 +{
1.123 + unsigned int i;
1.124 + PRUint8 j, tmp;
1.125 + PRUint8 K[256];
1.126 + PRUint8 *L;
1.127 +
1.128 + /* verify the key length. */
1.129 + PORT_Assert(len > 0 && len < ARCFOUR_STATE_SIZE);
1.130 + if (len == 0 || len >= ARCFOUR_STATE_SIZE) {
1.131 + PORT_SetError(SEC_ERROR_BAD_KEY);
1.132 + return SECFailure;
1.133 + }
1.134 + if (cx == NULL) {
1.135 + PORT_SetError(SEC_ERROR_INVALID_ARGS);
1.136 + return SECFailure;
1.137 + }
1.138 + /* Initialize the state using array indices. */
1.139 + memcpy(cx->S, Kinit, sizeof cx->S);
1.140 + /* Fill in K repeatedly with values from key. */
1.141 + L = K;
1.142 + for (i = sizeof K; i > len; i-= len) {
1.143 + memcpy(L, key, len);
1.144 + L += len;
1.145 + }
1.146 + memcpy(L, key, i);
1.147 + /* Stir the state of the generator. At this point it is assumed
1.148 + * that the key is the size of the state buffer. If this is not
1.149 + * the case, the key bytes are repeated to fill the buffer.
1.150 + */
1.151 + j = 0;
1.152 +#define ARCFOUR_STATE_STIR(ii) \
1.153 + j = j + cx->S[ii] + K[ii]; \
1.154 + SWAP(cx->S[ii], cx->S[j]);
1.155 + for (i=0; i<ARCFOUR_STATE_SIZE; i++) {
1.156 + ARCFOUR_STATE_STIR(i);
1.157 + }
1.158 + cx->i = 0;
1.159 + cx->j = 0;
1.160 + return SECSuccess;
1.161 +}
1.162 +
1.163 +
1.164 +/*
1.165 + * Initialize a new generator.
1.166 + */
1.167 +RC4Context *
1.168 +RC4_CreateContext(const unsigned char *key, int len)
1.169 +{
1.170 + RC4Context *cx = RC4_AllocateContext();
1.171 + if (cx) {
1.172 + SECStatus rv = RC4_InitContext(cx, key, len, NULL, 0, 0, 0);
1.173 + if (rv != SECSuccess) {
1.174 + PORT_ZFree(cx, sizeof(*cx));
1.175 + cx = NULL;
1.176 + }
1.177 + }
1.178 + return cx;
1.179 +}
1.180 +
1.181 +void
1.182 +RC4_DestroyContext(RC4Context *cx, PRBool freeit)
1.183 +{
1.184 + if (freeit)
1.185 + PORT_ZFree(cx, sizeof(*cx));
1.186 +}
1.187 +
1.188 +#if defined(NSS_BEVAND_ARCFOUR)
1.189 +extern void ARCFOUR(RC4Context *cx, WORD inputLen,
1.190 + const unsigned char *input, unsigned char *output);
1.191 +#else
1.192 +/*
1.193 + * Generate the next byte in the stream.
1.194 + */
1.195 +#define ARCFOUR_NEXT_BYTE() \
1.196 + tmpSi = cx->S[++tmpi]; \
1.197 + tmpj += tmpSi; \
1.198 + tmpSj = cx->S[tmpj]; \
1.199 + cx->S[tmpi] = tmpSj; \
1.200 + cx->S[tmpj] = tmpSi; \
1.201 + t = tmpSi + tmpSj;
1.202 +
1.203 +#ifdef CONVERT_TO_WORDS
1.204 +/*
1.205 + * Straight ARCFOUR op. No optimization.
1.206 + */
1.207 +static SECStatus
1.208 +rc4_no_opt(RC4Context *cx, unsigned char *output,
1.209 + unsigned int *outputLen, unsigned int maxOutputLen,
1.210 + const unsigned char *input, unsigned int inputLen)
1.211 +{
1.212 + PRUint8 t;
1.213 + Stype tmpSi, tmpSj;
1.214 + register PRUint8 tmpi = cx->i;
1.215 + register PRUint8 tmpj = cx->j;
1.216 + unsigned int index;
1.217 + PORT_Assert(maxOutputLen >= inputLen);
1.218 + if (maxOutputLen < inputLen) {
1.219 + PORT_SetError(SEC_ERROR_OUTPUT_LEN);
1.220 + return SECFailure;
1.221 + }
1.222 + for (index=0; index < inputLen; index++) {
1.223 + /* Generate next byte from stream. */
1.224 + ARCFOUR_NEXT_BYTE();
1.225 + /* output = next stream byte XOR next input byte */
1.226 + output[index] = cx->S[t] ^ input[index];
1.227 + }
1.228 + *outputLen = inputLen;
1.229 + cx->i = tmpi;
1.230 + cx->j = tmpj;
1.231 + return SECSuccess;
1.232 +}
1.233 +
1.234 +#else
1.235 +/* !CONVERT_TO_WORDS */
1.236 +
1.237 +/*
1.238 + * Byte-at-a-time ARCFOUR, unrolling the loop into 8 pieces.
1.239 + */
1.240 +static SECStatus
1.241 +rc4_unrolled(RC4Context *cx, unsigned char *output,
1.242 + unsigned int *outputLen, unsigned int maxOutputLen,
1.243 + const unsigned char *input, unsigned int inputLen)
1.244 +{
1.245 + PRUint8 t;
1.246 + Stype tmpSi, tmpSj;
1.247 + register PRUint8 tmpi = cx->i;
1.248 + register PRUint8 tmpj = cx->j;
1.249 + int index;
1.250 + PORT_Assert(maxOutputLen >= inputLen);
1.251 + if (maxOutputLen < inputLen) {
1.252 + PORT_SetError(SEC_ERROR_OUTPUT_LEN);
1.253 + return SECFailure;
1.254 + }
1.255 + for (index = inputLen / 8; index-- > 0; input += 8, output += 8) {
1.256 + ARCFOUR_NEXT_BYTE();
1.257 + output[0] = cx->S[t] ^ input[0];
1.258 + ARCFOUR_NEXT_BYTE();
1.259 + output[1] = cx->S[t] ^ input[1];
1.260 + ARCFOUR_NEXT_BYTE();
1.261 + output[2] = cx->S[t] ^ input[2];
1.262 + ARCFOUR_NEXT_BYTE();
1.263 + output[3] = cx->S[t] ^ input[3];
1.264 + ARCFOUR_NEXT_BYTE();
1.265 + output[4] = cx->S[t] ^ input[4];
1.266 + ARCFOUR_NEXT_BYTE();
1.267 + output[5] = cx->S[t] ^ input[5];
1.268 + ARCFOUR_NEXT_BYTE();
1.269 + output[6] = cx->S[t] ^ input[6];
1.270 + ARCFOUR_NEXT_BYTE();
1.271 + output[7] = cx->S[t] ^ input[7];
1.272 + }
1.273 + index = inputLen % 8;
1.274 + if (index) {
1.275 + input += index;
1.276 + output += index;
1.277 + switch (index) {
1.278 + case 7:
1.279 + ARCFOUR_NEXT_BYTE();
1.280 + output[-7] = cx->S[t] ^ input[-7]; /* FALLTHRU */
1.281 + case 6:
1.282 + ARCFOUR_NEXT_BYTE();
1.283 + output[-6] = cx->S[t] ^ input[-6]; /* FALLTHRU */
1.284 + case 5:
1.285 + ARCFOUR_NEXT_BYTE();
1.286 + output[-5] = cx->S[t] ^ input[-5]; /* FALLTHRU */
1.287 + case 4:
1.288 + ARCFOUR_NEXT_BYTE();
1.289 + output[-4] = cx->S[t] ^ input[-4]; /* FALLTHRU */
1.290 + case 3:
1.291 + ARCFOUR_NEXT_BYTE();
1.292 + output[-3] = cx->S[t] ^ input[-3]; /* FALLTHRU */
1.293 + case 2:
1.294 + ARCFOUR_NEXT_BYTE();
1.295 + output[-2] = cx->S[t] ^ input[-2]; /* FALLTHRU */
1.296 + case 1:
1.297 + ARCFOUR_NEXT_BYTE();
1.298 + output[-1] = cx->S[t] ^ input[-1]; /* FALLTHRU */
1.299 + default:
1.300 + /* FALLTHRU */
1.301 + ; /* hp-ux build breaks without this */
1.302 + }
1.303 + }
1.304 + cx->i = tmpi;
1.305 + cx->j = tmpj;
1.306 + *outputLen = inputLen;
1.307 + return SECSuccess;
1.308 +}
1.309 +#endif
1.310 +
1.311 +#ifdef IS_LITTLE_ENDIAN
1.312 +#define ARCFOUR_NEXT4BYTES_L(n) \
1.313 + ARCFOUR_NEXT_BYTE(); streamWord |= (WORD)cx->S[t] << (n ); \
1.314 + ARCFOUR_NEXT_BYTE(); streamWord |= (WORD)cx->S[t] << (n + 8); \
1.315 + ARCFOUR_NEXT_BYTE(); streamWord |= (WORD)cx->S[t] << (n + 16); \
1.316 + ARCFOUR_NEXT_BYTE(); streamWord |= (WORD)cx->S[t] << (n + 24);
1.317 +#else
1.318 +#define ARCFOUR_NEXT4BYTES_B(n) \
1.319 + ARCFOUR_NEXT_BYTE(); streamWord |= (WORD)cx->S[t] << (n + 24); \
1.320 + ARCFOUR_NEXT_BYTE(); streamWord |= (WORD)cx->S[t] << (n + 16); \
1.321 + ARCFOUR_NEXT_BYTE(); streamWord |= (WORD)cx->S[t] << (n + 8); \
1.322 + ARCFOUR_NEXT_BYTE(); streamWord |= (WORD)cx->S[t] << (n );
1.323 +#endif
1.324 +
1.325 +#if (defined(IS_64) && !defined(__sparc)) || defined(NSS_USE_64)
1.326 +/* 64-bit wordsize */
1.327 +#ifdef IS_LITTLE_ENDIAN
1.328 +#define ARCFOUR_NEXT_WORD() \
1.329 + { streamWord = 0; ARCFOUR_NEXT4BYTES_L(0); ARCFOUR_NEXT4BYTES_L(32); }
1.330 +#else
1.331 +#define ARCFOUR_NEXT_WORD() \
1.332 + { streamWord = 0; ARCFOUR_NEXT4BYTES_B(32); ARCFOUR_NEXT4BYTES_B(0); }
1.333 +#endif
1.334 +#else
1.335 +/* 32-bit wordsize */
1.336 +#ifdef IS_LITTLE_ENDIAN
1.337 +#define ARCFOUR_NEXT_WORD() \
1.338 + { streamWord = 0; ARCFOUR_NEXT4BYTES_L(0); }
1.339 +#else
1.340 +#define ARCFOUR_NEXT_WORD() \
1.341 + { streamWord = 0; ARCFOUR_NEXT4BYTES_B(0); }
1.342 +#endif
1.343 +#endif
1.344 +
1.345 +#ifdef IS_LITTLE_ENDIAN
1.346 +#define RSH <<
1.347 +#define LSH >>
1.348 +#else
1.349 +#define RSH >>
1.350 +#define LSH <<
1.351 +#endif
1.352 +
1.353 +#ifdef IS_LITTLE_ENDIAN
1.354 +#define LEFTMOST_BYTE_SHIFT 0
1.355 +#define NEXT_BYTE_SHIFT(shift) shift + 8
1.356 +#else
1.357 +#define LEFTMOST_BYTE_SHIFT 8*(WORDSIZE - 1)
1.358 +#define NEXT_BYTE_SHIFT(shift) shift - 8
1.359 +#endif
1.360 +
1.361 +#ifdef CONVERT_TO_WORDS
1.362 +static SECStatus
1.363 +rc4_wordconv(RC4Context *cx, unsigned char *output,
1.364 + unsigned int *outputLen, unsigned int maxOutputLen,
1.365 + const unsigned char *input, unsigned int inputLen)
1.366 +{
1.367 + PR_STATIC_ASSERT(sizeof(PRUword) == sizeof(ptrdiff_t));
1.368 + unsigned int inOffset = (PRUword)input % WORDSIZE;
1.369 + unsigned int outOffset = (PRUword)output % WORDSIZE;
1.370 + register WORD streamWord;
1.371 + register const WORD *pInWord;
1.372 + register WORD *pOutWord;
1.373 + register WORD inWord, nextInWord;
1.374 + PRUint8 t;
1.375 + register Stype tmpSi, tmpSj;
1.376 + register PRUint8 tmpi = cx->i;
1.377 + register PRUint8 tmpj = cx->j;
1.378 + unsigned int bufShift, invBufShift;
1.379 + unsigned int i;
1.380 + const unsigned char *finalIn;
1.381 + unsigned char *finalOut;
1.382 +
1.383 + PORT_Assert(maxOutputLen >= inputLen);
1.384 + if (maxOutputLen < inputLen) {
1.385 + PORT_SetError(SEC_ERROR_OUTPUT_LEN);
1.386 + return SECFailure;
1.387 + }
1.388 + if (inputLen < 2*WORDSIZE) {
1.389 + /* Ignore word conversion, do byte-at-a-time */
1.390 + return rc4_no_opt(cx, output, outputLen, maxOutputLen, input, inputLen);
1.391 + }
1.392 + *outputLen = inputLen;
1.393 + pInWord = (const WORD *)(input - inOffset);
1.394 + pOutWord = (WORD *)(output - outOffset);
1.395 + if (inOffset <= outOffset) {
1.396 + bufShift = 8*(outOffset - inOffset);
1.397 + invBufShift = 8*WORDSIZE - bufShift;
1.398 + } else {
1.399 + invBufShift = 8*(inOffset - outOffset);
1.400 + bufShift = 8*WORDSIZE - invBufShift;
1.401 + }
1.402 + /*****************************************************************/
1.403 + /* Step 1: */
1.404 + /* If the first output word is partial, consume the bytes in the */
1.405 + /* first partial output word by loading one or two words of */
1.406 + /* input and shifting them accordingly. Otherwise, just load */
1.407 + /* in the first word of input. At the end of this block, at */
1.408 + /* least one partial word of input should ALWAYS be loaded. */
1.409 + /*****************************************************************/
1.410 + if (outOffset) {
1.411 + unsigned int byteCount = WORDSIZE - outOffset;
1.412 + for (i = 0; i < byteCount; i++) {
1.413 + ARCFOUR_NEXT_BYTE();
1.414 + output[i] = cx->S[t] ^ input[i];
1.415 + }
1.416 + /* Consumed byteCount bytes of input */
1.417 + inputLen -= byteCount;
1.418 + pInWord++;
1.419 +
1.420 + /* move to next word of output */
1.421 + pOutWord++;
1.422 +
1.423 + /* If buffers are relatively misaligned, shift the bytes in inWord
1.424 + * to be aligned to the output buffer.
1.425 + */
1.426 + if (inOffset < outOffset) {
1.427 + /* The first input word (which may be partial) has more bytes
1.428 + * than needed. Copy the remainder to inWord.
1.429 + */
1.430 + unsigned int shift = LEFTMOST_BYTE_SHIFT;
1.431 + inWord = 0;
1.432 + for (i = 0; i < outOffset - inOffset; i++) {
1.433 + inWord |= (WORD)input[byteCount + i] << shift;
1.434 + shift = NEXT_BYTE_SHIFT(shift);
1.435 + }
1.436 + } else if (inOffset > outOffset) {
1.437 + /* Consumed some bytes in the second input word. Copy the
1.438 + * remainder to inWord.
1.439 + */
1.440 + inWord = *pInWord++;
1.441 + inWord = inWord LSH invBufShift;
1.442 + } else {
1.443 + inWord = 0;
1.444 + }
1.445 + } else {
1.446 + /* output is word-aligned */
1.447 + if (inOffset) {
1.448 + /* Input is not word-aligned. The first word load of input
1.449 + * will not produce a full word of input bytes, so one word
1.450 + * must be pre-loaded. The main loop below will load in the
1.451 + * next input word and shift some of its bytes into inWord
1.452 + * in order to create a full input word. Note that the main
1.453 + * loop must execute at least once because the input must
1.454 + * be at least two words.
1.455 + */
1.456 + unsigned int shift = LEFTMOST_BYTE_SHIFT;
1.457 + inWord = 0;
1.458 + for (i = 0; i < WORDSIZE - inOffset; i++) {
1.459 + inWord |= (WORD)input[i] << shift;
1.460 + shift = NEXT_BYTE_SHIFT(shift);
1.461 + }
1.462 + pInWord++;
1.463 + } else {
1.464 + /* Input is word-aligned. The first word load of input
1.465 + * will produce a full word of input bytes, so nothing
1.466 + * needs to be loaded here.
1.467 + */
1.468 + inWord = 0;
1.469 + }
1.470 + }
1.471 + /*****************************************************************/
1.472 + /* Step 2: main loop */
1.473 + /* At this point the output buffer is word-aligned. Any unused */
1.474 + /* bytes from above will be in inWord (shifted correctly). If */
1.475 + /* the input buffer is unaligned relative to the output buffer, */
1.476 + /* shifting has to be done. */
1.477 + /*****************************************************************/
1.478 + if (bufShift) {
1.479 + /* preloadedByteCount is the number of input bytes pre-loaded
1.480 + * in inWord.
1.481 + */
1.482 + unsigned int preloadedByteCount = bufShift/8;
1.483 + for (; inputLen >= preloadedByteCount + WORDSIZE;
1.484 + inputLen -= WORDSIZE) {
1.485 + nextInWord = *pInWord++;
1.486 + inWord |= nextInWord RSH bufShift;
1.487 + nextInWord = nextInWord LSH invBufShift;
1.488 + ARCFOUR_NEXT_WORD();
1.489 + *pOutWord++ = inWord ^ streamWord;
1.490 + inWord = nextInWord;
1.491 + }
1.492 + if (inputLen == 0) {
1.493 + /* Nothing left to do. */
1.494 + cx->i = tmpi;
1.495 + cx->j = tmpj;
1.496 + return SECSuccess;
1.497 + }
1.498 + finalIn = (const unsigned char *)pInWord - preloadedByteCount;
1.499 + } else {
1.500 + for (; inputLen >= WORDSIZE; inputLen -= WORDSIZE) {
1.501 + inWord = *pInWord++;
1.502 + ARCFOUR_NEXT_WORD();
1.503 + *pOutWord++ = inWord ^ streamWord;
1.504 + }
1.505 + if (inputLen == 0) {
1.506 + /* Nothing left to do. */
1.507 + cx->i = tmpi;
1.508 + cx->j = tmpj;
1.509 + return SECSuccess;
1.510 + }
1.511 + finalIn = (const unsigned char *)pInWord;
1.512 + }
1.513 + /*****************************************************************/
1.514 + /* Step 3: */
1.515 + /* Do the remaining partial word of input one byte at a time. */
1.516 + /*****************************************************************/
1.517 + finalOut = (unsigned char *)pOutWord;
1.518 + for (i = 0; i < inputLen; i++) {
1.519 + ARCFOUR_NEXT_BYTE();
1.520 + finalOut[i] = cx->S[t] ^ finalIn[i];
1.521 + }
1.522 + cx->i = tmpi;
1.523 + cx->j = tmpj;
1.524 + return SECSuccess;
1.525 +}
1.526 +#endif
1.527 +#endif /* NSS_BEVAND_ARCFOUR */
1.528 +
1.529 +SECStatus
1.530 +RC4_Encrypt(RC4Context *cx, unsigned char *output,
1.531 + unsigned int *outputLen, unsigned int maxOutputLen,
1.532 + const unsigned char *input, unsigned int inputLen)
1.533 +{
1.534 + PORT_Assert(maxOutputLen >= inputLen);
1.535 + if (maxOutputLen < inputLen) {
1.536 + PORT_SetError(SEC_ERROR_OUTPUT_LEN);
1.537 + return SECFailure;
1.538 + }
1.539 +#if defined(NSS_BEVAND_ARCFOUR)
1.540 + ARCFOUR(cx, inputLen, input, output);
1.541 + *outputLen = inputLen;
1.542 + return SECSuccess;
1.543 +#elif defined( CONVERT_TO_WORDS )
1.544 + /* Convert the byte-stream to a word-stream */
1.545 + return rc4_wordconv(cx, output, outputLen, maxOutputLen, input, inputLen);
1.546 +#else
1.547 + /* Operate on bytes, but unroll the main loop */
1.548 + return rc4_unrolled(cx, output, outputLen, maxOutputLen, input, inputLen);
1.549 +#endif
1.550 +}
1.551 +
1.552 +SECStatus RC4_Decrypt(RC4Context *cx, unsigned char *output,
1.553 + unsigned int *outputLen, unsigned int maxOutputLen,
1.554 + const unsigned char *input, unsigned int inputLen)
1.555 +{
1.556 + PORT_Assert(maxOutputLen >= inputLen);
1.557 + if (maxOutputLen < inputLen) {
1.558 + PORT_SetError(SEC_ERROR_OUTPUT_LEN);
1.559 + return SECFailure;
1.560 + }
1.561 + /* decrypt and encrypt are same operation. */
1.562 +#if defined(NSS_BEVAND_ARCFOUR)
1.563 + ARCFOUR(cx, inputLen, input, output);
1.564 + *outputLen = inputLen;
1.565 + return SECSuccess;
1.566 +#elif defined( CONVERT_TO_WORDS )
1.567 + /* Convert the byte-stream to a word-stream */
1.568 + return rc4_wordconv(cx, output, outputLen, maxOutputLen, input, inputLen);
1.569 +#else
1.570 + /* Operate on bytes, but unroll the main loop */
1.571 + return rc4_unrolled(cx, output, outputLen, maxOutputLen, input, inputLen);
1.572 +#endif
1.573 +}
1.574 +
1.575 +#undef CONVERT_TO_WORDS
1.576 +#undef USE_WORD
