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Diffstat (limited to 'security/nss/lib/freebl/arcfour.c')
-rw-r--r-- | security/nss/lib/freebl/arcfour.c | 593 |
1 files changed, 0 insertions, 593 deletions
diff --git a/security/nss/lib/freebl/arcfour.c b/security/nss/lib/freebl/arcfour.c deleted file mode 100644 index 0a5a72267..000000000 --- a/security/nss/lib/freebl/arcfour.c +++ /dev/null @@ -1,593 +0,0 @@ -/* arcfour.c - the arc four algorithm. - * - * The contents of this file are subject to the Mozilla Public - * License Version 1.1 (the "License"); you may not use this file - * except in compliance with the License. You may obtain a copy of - * the License at http://www.mozilla.org/MPL/ - * - * Software distributed under the License is distributed on an "AS - * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or - * implied. See the License for the specific language governing - * rights and limitations under the License. - * - * The Original Code is the Netscape security libraries. - * - * The Initial Developer of the Original Code is Netscape - * Communications Corporation. Portions created by Netscape are - * Copyright (C) 1994-2000 Netscape Communications Corporation. All - * Rights Reserved. - * - * Contributor(s): - * - * Alternatively, the contents of this file may be used under the - * terms of the GNU General Public License Version 2 or later (the - * "GPL"), in which case the provisions of the GPL are applicable - * instead of those above. If you wish to allow use of your - * version of this file only under the terms of the GPL and not to - * allow others to use your version of this file under the MPL, - * indicate your decision by deleting the provisions above and - * replace them with the notice and other provisions required by - * the GPL. If you do not delete the provisions above, a recipient - * may use your version of this file under either the MPL or the - * GPL. - */ - -/* See NOTES ON UMRs, Unititialized Memory Reads, below. */ - -#include "prerr.h" -#include "secerr.h" - -#include "prtypes.h" -#include "blapi.h" - -/* Architecture-dependent defines */ - -#if defined(SOLARIS) || defined(HPUX) || defined(i386) || defined(IRIX) -/* Convert the byte-stream to a word-stream */ -#define CONVERT_TO_WORDS -#endif - -#if defined(AIX) || defined(OSF1) -/* Treat array variables as longs, not bytes */ -#define USE_LONG -#endif - -#if defined(_WIN32_WCE) -#undef WORD -#define WORD ARC4WORD -#endif - -#if defined(NSS_USE_HYBRID) && !defined(SOLARIS) && !defined(NSS_USE_64) -typedef unsigned long long WORD; -#else -typedef unsigned long WORD; -#endif -#define WORDSIZE sizeof(WORD) - -#ifdef USE_LONG -typedef unsigned long Stype; -#else -typedef PRUint8 Stype; -#endif - -#define ARCFOUR_STATE_SIZE 256 - -#define MASK1BYTE (WORD)(0xff) - -#define SWAP(a, b) \ - tmp = a; \ - a = b; \ - b = tmp; - -/* - * State information for stream cipher. - */ -struct RC4ContextStr -{ - Stype S[ARCFOUR_STATE_SIZE]; - PRUint8 i; - PRUint8 j; -}; - -/* - * array indices [0..255] to initialize cx->S array (faster than loop). - */ -static const Stype Kinit[256] = { - 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, - 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, - 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, - 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, - 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, - 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, - 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, - 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, - 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, - 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, - 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, - 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, - 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, - 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, - 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, - 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, - 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, - 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, - 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, - 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, - 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, - 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, - 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, - 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, - 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, - 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, - 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, - 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, - 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, - 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, - 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, - 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff -}; - -/* - * Initialize a new generator. - */ -RC4Context * -RC4_CreateContext(const unsigned char *key, int len) -{ - int i; - PRUint8 j, tmp; - RC4Context *cx; - PRUint8 K[256]; - PRUint8 *L; - /* verify the key length. */ - PORT_Assert(len > 0 && len < ARCFOUR_STATE_SIZE); - if (len < 0 || len >= ARCFOUR_STATE_SIZE) { - PORT_SetError(SEC_ERROR_INVALID_ARGS); - return NULL; - } - /* Create space for the context. */ - cx = (RC4Context *)PORT_ZAlloc(sizeof(RC4Context)); - if (cx == NULL) { - PORT_SetError(PR_OUT_OF_MEMORY_ERROR); - return NULL; - } - /* Initialize the state using array indices. */ - memcpy(cx->S, Kinit, sizeof cx->S); - /* Fill in K repeatedly with values from key. */ - L = K; - for (i = sizeof K; i > len; i-= len) { - memcpy(L, key, len); - L += len; - } - memcpy(L, key, i); - /* Stir the state of the generator. At this point it is assumed - * that the key is the size of the state buffer. If this is not - * the case, the key bytes are repeated to fill the buffer. - */ - j = 0; -#define ARCFOUR_STATE_STIR(ii) \ - j = j + cx->S[ii] + K[ii]; \ - SWAP(cx->S[ii], cx->S[j]); - for (i=0; i<ARCFOUR_STATE_SIZE; i++) { - ARCFOUR_STATE_STIR(i); - } - cx->i = 0; - cx->j = 0; - return cx; -} - -void -RC4_DestroyContext(RC4Context *cx, PRBool freeit) -{ - if (freeit) - PORT_ZFree(cx, sizeof(*cx)); -} - -/* - * Generate the next byte in the stream. - */ -#define ARCFOUR_NEXT_BYTE() \ - tmpSi = cx->S[++tmpi]; \ - tmpj += tmpSi; \ - tmpSj = cx->S[tmpj]; \ - cx->S[tmpi] = tmpSj; \ - cx->S[tmpj] = tmpSi; \ - t = tmpSi + tmpSj; - -#ifdef CONVERT_TO_WORDS -/* - * Straight RC4 op. No optimization. - */ -static SECStatus -rc4_no_opt(RC4Context *cx, unsigned char *output, - unsigned int *outputLen, unsigned int maxOutputLen, - const unsigned char *input, unsigned int inputLen) -{ - PRUint8 t; - Stype tmpSi, tmpSj; - register PRUint8 tmpi = cx->i; - register PRUint8 tmpj = cx->j; - unsigned int index; - PORT_Assert(maxOutputLen >= inputLen); - if (maxOutputLen < inputLen) { - PORT_SetError(SEC_ERROR_INVALID_ARGS); - return SECFailure; - } - for (index=0; index < inputLen; index++) { - /* Generate next byte from stream. */ - ARCFOUR_NEXT_BYTE(); - /* output = next stream byte XOR next input byte */ - output[index] = cx->S[t] ^ input[index]; - } - *outputLen = inputLen; - cx->i = tmpi; - cx->j = tmpj; - return SECSuccess; -} -#endif - -#ifndef CONVERT_TO_WORDS -/* - * Byte-at-a-time RC4, unrolling the loop into 8 pieces. - */ -static SECStatus -rc4_unrolled(RC4Context *cx, unsigned char *output, - unsigned int *outputLen, unsigned int maxOutputLen, - const unsigned char *input, unsigned int inputLen) -{ - PRUint8 t; - Stype tmpSi, tmpSj; - register PRUint8 tmpi = cx->i; - register PRUint8 tmpj = cx->j; - int index; - PORT_Assert(maxOutputLen >= inputLen); - if (maxOutputLen < inputLen) { - PORT_SetError(SEC_ERROR_INVALID_ARGS); - return SECFailure; - } - for (index = inputLen / 8; index-- > 0; input += 8, output += 8) { - ARCFOUR_NEXT_BYTE(); - output[0] = cx->S[t] ^ input[0]; - ARCFOUR_NEXT_BYTE(); - output[1] = cx->S[t] ^ input[1]; - ARCFOUR_NEXT_BYTE(); - output[2] = cx->S[t] ^ input[2]; - ARCFOUR_NEXT_BYTE(); - output[3] = cx->S[t] ^ input[3]; - ARCFOUR_NEXT_BYTE(); - output[4] = cx->S[t] ^ input[4]; - ARCFOUR_NEXT_BYTE(); - output[5] = cx->S[t] ^ input[5]; - ARCFOUR_NEXT_BYTE(); - output[6] = cx->S[t] ^ input[6]; - ARCFOUR_NEXT_BYTE(); - output[7] = cx->S[t] ^ input[7]; - } - index = inputLen % 8; - if (index) { - input += index; - output += index; - switch (index) { - case 7: - ARCFOUR_NEXT_BYTE(); - output[-7] = cx->S[t] ^ input[-7]; /* FALLTHRU */ - case 6: - ARCFOUR_NEXT_BYTE(); - output[-6] = cx->S[t] ^ input[-6]; /* FALLTHRU */ - case 5: - ARCFOUR_NEXT_BYTE(); - output[-5] = cx->S[t] ^ input[-5]; /* FALLTHRU */ - case 4: - ARCFOUR_NEXT_BYTE(); - output[-4] = cx->S[t] ^ input[-4]; /* FALLTHRU */ - case 3: - ARCFOUR_NEXT_BYTE(); - output[-3] = cx->S[t] ^ input[-3]; /* FALLTHRU */ - case 2: - ARCFOUR_NEXT_BYTE(); - output[-2] = cx->S[t] ^ input[-2]; /* FALLTHRU */ - case 1: - ARCFOUR_NEXT_BYTE(); - output[-1] = cx->S[t] ^ input[-1]; /* FALLTHRU */ - default: - /* FALLTHRU */ - ; /* hp-ux build breaks without this */ - } - } - cx->i = tmpi; - cx->j = tmpj; - *outputLen = inputLen; - return SECSuccess; -} -#endif - -#ifdef IS_LITTLE_ENDIAN -#define ARCFOUR_NEXT4BYTES_L(n) \ - ARCFOUR_NEXT_BYTE(); streamWord |= (WORD)cx->S[t] << (n ); \ - ARCFOUR_NEXT_BYTE(); streamWord |= (WORD)cx->S[t] << (n + 8); \ - ARCFOUR_NEXT_BYTE(); streamWord |= (WORD)cx->S[t] << (n + 16); \ - ARCFOUR_NEXT_BYTE(); streamWord |= (WORD)cx->S[t] << (n + 24); -#else -#define ARCFOUR_NEXT4BYTES_B(n) \ - ARCFOUR_NEXT_BYTE(); streamWord |= (WORD)cx->S[t] << (n + 24); \ - ARCFOUR_NEXT_BYTE(); streamWord |= (WORD)cx->S[t] << (n + 16); \ - ARCFOUR_NEXT_BYTE(); streamWord |= (WORD)cx->S[t] << (n + 8); \ - ARCFOUR_NEXT_BYTE(); streamWord |= (WORD)cx->S[t] << (n ); -#endif - -#if (defined(NSS_USE_HYBRID) && !defined(SOLARIS)) || defined(NSS_USE_64) -/* 64-bit wordsize */ -#ifdef IS_LITTLE_ENDIAN -#define ARCFOUR_NEXT_WORD() \ - { streamWord = 0; ARCFOUR_NEXT4BYTES_L(0); ARCFOUR_NEXT4BYTES_L(32); } -#else -#define ARCFOUR_NEXT_WORD() \ - { streamWord = 0; ARCFOUR_NEXT4BYTES_B(32); ARCFOUR_NEXT4BYTES_B(0); } -#endif -#else -/* 32-bit wordsize */ -#ifdef IS_LITTLE_ENDIAN -#define ARCFOUR_NEXT_WORD() \ - { streamWord = 0; ARCFOUR_NEXT4BYTES_L(0); } -#else -#define ARCFOUR_NEXT_WORD() \ - { streamWord = 0; ARCFOUR_NEXT4BYTES_B(0); } -#endif -#endif - -#ifdef IS_LITTLE_ENDIAN -#define RSH << -#define LSH >> -#else -#define RSH >> -#define LSH << -#endif - -#ifdef CONVERT_TO_WORDS -/* NOTE about UMRs, Uninitialized Memory Reads. - * - * This code reads all input data a WORD at a time, rather than byte at - * a time, and writes all output data a WORD at a time. Shifting and - * masking is used to remove unwanted data and realign bytes when - * needed. The first and last words of output are read, modified, and - * written when needed to preserve any unchanged bytes. This is a huge - * win on machines with high memory latency. - * - * However, when the input and output buffers do not begin and end on WORD - * boundaries, and the WORDS in memory that contain the first and last - * bytes of those buffers contain uninitialized data, then this code will - * read those uninitialized bytes, causing a UMR error to be reported by - * some tools. - * - * These UMRs are NOT a problem, NOT errors, and do NOT need to be "fixed". - * - * All the words read and written contain at least one byte that is - * part of the input data or output data. No words are read or written - * that do not contain data that is part of the buffer. Therefore, - * these UMRs cannot cause page faults or other problems unless the - * buffers have been assigned to improper addresses that would cause - * page faults with or without UMRs. - */ -static SECStatus -rc4_wordconv(RC4Context *cx, unsigned char *output, - unsigned int *outputLen, unsigned int maxOutputLen, - const unsigned char *input, unsigned int inputLen) -{ - ptrdiff_t inOffset = (ptrdiff_t)input % WORDSIZE; - ptrdiff_t outOffset = (ptrdiff_t)output % WORDSIZE; - register WORD streamWord, mask; - register WORD *pInWord, *pOutWord; - register WORD inWord, nextInWord; - PRUint8 t; - register Stype tmpSi, tmpSj; - register PRUint8 tmpi = cx->i; - register PRUint8 tmpj = cx->j; - unsigned int byteCount; - unsigned int bufShift, invBufShift; - int i; - - PORT_Assert(maxOutputLen >= inputLen); - if (maxOutputLen < inputLen) { - PORT_SetError(SEC_ERROR_INVALID_ARGS); - return SECFailure; - } - if (inputLen < 2*WORDSIZE) { - /* Ignore word conversion, do byte-at-a-time */ - return rc4_no_opt(cx, output, outputLen, maxOutputLen, input, inputLen); - } - *outputLen = inputLen; - pInWord = (WORD *)(input - inOffset); - if (inOffset < outOffset) { - bufShift = 8*(outOffset - inOffset); - invBufShift = 8*WORDSIZE - bufShift; - } else { - invBufShift = 8*(inOffset - outOffset); - bufShift = 8*WORDSIZE - invBufShift; - } - /*****************************************************************/ - /* Step 1: */ - /* If the first output word is partial, consume the bytes in the */ - /* first partial output word by loading one or two words of */ - /* input and shifting them accordingly. Otherwise, just load */ - /* in the first word of input. At the end of this block, at */ - /* least one partial word of input should ALWAYS be loaded. */ - /*****************************************************************/ - if (outOffset) { - /* Generate input and stream words aligned relative to the - * partial output buffer. - */ - byteCount = WORDSIZE - outOffset; - pOutWord = (WORD *)(output - outOffset); - mask = streamWord = 0; -#ifdef IS_LITTLE_ENDIAN - for (i = WORDSIZE - byteCount; i < WORDSIZE; i++) { -#else - for (i = byteCount - 1; i >= 0; --i) { -#endif - ARCFOUR_NEXT_BYTE(); - streamWord |= (WORD)(cx->S[t]) << 8*i; - mask |= MASK1BYTE << 8*i; - } /* } */ - inWord = *pInWord++; /* UMR? see comments above. */ - /* If buffers are relatively misaligned, shift the bytes in inWord - * to be aligned to the output buffer. - */ - nextInWord = 0; - if (inOffset < outOffset) { - /* Have more bytes than needed, shift remainder into nextInWord */ - nextInWord = inWord LSH 8*(inOffset + byteCount); - inWord = inWord RSH bufShift; - } else if (inOffset > outOffset) { - /* Didn't get enough bytes from current input word, load another - * word and then shift remainder into nextInWord. - */ - nextInWord = *pInWord++; - inWord = (inWord LSH invBufShift) | - (nextInWord RSH bufShift); - nextInWord = nextInWord LSH invBufShift; - } - /* Store output of first partial word */ - *pOutWord = (*pOutWord & ~mask) | ((inWord ^ streamWord) & mask); - /* UMR? See comments above. */ - - /* Consumed byteCount bytes of input */ - inputLen -= byteCount; - /* move to next word of output */ - pOutWord++; - /* inWord has been consumed, but there may be bytes in nextInWord */ - inWord = nextInWord; - } else { - /* output is word-aligned */ - pOutWord = (WORD *)output; - if (inOffset) { - /* Input is not word-aligned. The first word load of input - * will not produce a full word of input bytes, so one word - * must be pre-loaded. The main loop below will load in the - * next input word and shift some of its bytes into inWord - * in order to create a full input word. Note that the main - * loop must execute at least once because the input must - * be at least two words. - */ - inWord = *pInWord++; /* UMR? see comments above. */ - inWord = inWord LSH invBufShift; - } else { - /* Input is word-aligned. The first word load of input - * will produce a full word of input bytes, so nothing - * needs to be loaded here. - */ - inWord = 0; - } - } - /* Output buffer is aligned, inOffset is now measured relative to - * outOffset (and not a word boundary). - */ - inOffset = (inOffset + WORDSIZE - outOffset) % WORDSIZE; - /*****************************************************************/ - /* Step 2: main loop */ - /* At this point the output buffer is word-aligned. Any unused */ - /* bytes from above will be in inWord (shifted correctly). If */ - /* the input buffer is unaligned relative to the output buffer, */ - /* shifting has to be done. */ - /*****************************************************************/ - if (inOffset) { - for (; inputLen >= WORDSIZE; inputLen -= WORDSIZE) { - nextInWord = *pInWord++; - inWord |= nextInWord RSH bufShift; - nextInWord = nextInWord LSH invBufShift; - ARCFOUR_NEXT_WORD(); - *pOutWord++ = inWord ^ streamWord; - inWord = nextInWord; - } - if (inputLen == 0) { - /* Nothing left to do. */ - cx->i = tmpi; - cx->j = tmpj; - return SECSuccess; - } - /* If the amount of remaining input is greater than the amount - * bytes pulled from the current input word, need to do another - * word load. What's left in inWord will be consumed in step 3. - */ - if (inputLen > WORDSIZE - inOffset) - inWord |= *pInWord RSH bufShift; /* UMR? See above. */ - } else { - for (; inputLen >= WORDSIZE; inputLen -= WORDSIZE) { - inWord = *pInWord++; - ARCFOUR_NEXT_WORD(); - *pOutWord++ = inWord ^ streamWord; - } - if (inputLen == 0) { - /* Nothing left to do. */ - cx->i = tmpi; - cx->j = tmpj; - return SECSuccess; - } else { - /* A partial input word remains at the tail. Load it. - * The relevant bytes will be consumed in step 3. - */ - inWord = *pInWord; /* UMR? See comments above */ - } - } - /*****************************************************************/ - /* Step 3: */ - /* A partial word of input remains, and it is already loaded */ - /* into nextInWord. Shift appropriately and consume the bytes */ - /* used in the partial word. */ - /*****************************************************************/ - mask = streamWord = 0; -#ifdef IS_LITTLE_ENDIAN - for (i = 0; i < inputLen; ++i) { -#else - for (i = WORDSIZE - 1; i >= WORDSIZE - inputLen; --i) { -#endif - ARCFOUR_NEXT_BYTE(); - streamWord |= (WORD)(cx->S[t]) << 8*i; - mask |= MASK1BYTE << 8*i; - } /* } */ - /* UMR? See comments above. */ - *pOutWord = (*pOutWord & ~mask) | ((inWord ^ streamWord) & mask); - cx->i = tmpi; - cx->j = tmpj; - return SECSuccess; -} -#endif - -SECStatus -RC4_Encrypt(RC4Context *cx, unsigned char *output, - unsigned int *outputLen, unsigned int maxOutputLen, - const unsigned char *input, unsigned int inputLen) -{ - PORT_Assert(maxOutputLen >= inputLen); - if (maxOutputLen < inputLen) { - PORT_SetError(SEC_ERROR_INVALID_ARGS); - return SECFailure; - } -#ifdef CONVERT_TO_WORDS - /* Convert the byte-stream to a word-stream */ - return rc4_wordconv(cx, output, outputLen, maxOutputLen, input, inputLen); -#else - /* Operate on bytes, but unroll the main loop */ - return rc4_unrolled(cx, output, outputLen, maxOutputLen, input, inputLen); -#endif -} - -SECStatus RC4_Decrypt(RC4Context *cx, unsigned char *output, - unsigned int *outputLen, unsigned int maxOutputLen, - const unsigned char *input, unsigned int inputLen) -{ - PORT_Assert(maxOutputLen >= inputLen); - if (maxOutputLen < inputLen) { - PORT_SetError(SEC_ERROR_INVALID_ARGS); - return SECFailure; - } - /* decrypt and encrypt are same operation. */ -#ifdef CONVERT_TO_WORDS - /* Convert the byte-stream to a word-stream */ - return rc4_wordconv(cx, output, outputLen, maxOutputLen, input, inputLen); -#else - /* Operate on bytes, but unroll the main loop */ - return rc4_unrolled(cx, output, outputLen, maxOutputLen, input, inputLen); -#endif -} - -#undef CONVERT_TO_WORDS -#undef USE_LONG |