diff options
Diffstat (limited to 'security/nss/lib/freebl/arcfour.c')
-rw-r--r-- | security/nss/lib/freebl/arcfour.c | 573 |
1 files changed, 0 insertions, 573 deletions
diff --git a/security/nss/lib/freebl/arcfour.c b/security/nss/lib/freebl/arcfour.c deleted file mode 100644 index 103ff5938..000000000 --- a/security/nss/lib/freebl/arcfour.c +++ /dev/null @@ -1,573 +0,0 @@ -/* arcfour.c - the arc four algorithm. - * - * This Source Code Form is subject to the terms of the Mozilla Public - * License, v. 2.0. If a copy of the MPL was not distributed with this - * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ - -#ifdef FREEBL_NO_DEPEND -#include "stubs.h" -#endif - -#include "prerr.h" -#include "secerr.h" - -#include "prtypes.h" -#include "blapi.h" - -/* Architecture-dependent defines */ - -#if defined(SOLARIS) || defined(HPUX) || defined(NSS_X86) || \ - defined(_WIN64) -/* Convert the byte-stream to a word-stream */ -#define CONVERT_TO_WORDS -#endif - -#if defined(AIX) || defined(OSF1) || defined(NSS_BEVAND_ARCFOUR) -/* Treat array variables as words, not bytes, on CPUs that take - * much longer to write bytes than to write words, or when using - * assembler code that required it. - */ -#define USE_WORD -#endif - -#if (defined(IS_64)) -typedef PRUint64 WORD; -#else -typedef PRUint32 WORD; -#endif -#define WORDSIZE sizeof(WORD) - -#if defined(USE_WORD) -typedef WORD 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 -{ -#if defined(NSS_ARCFOUR_IJ_B4_S) || defined(NSS_BEVAND_ARCFOUR) - Stype i; - Stype j; - Stype S[ARCFOUR_STATE_SIZE]; -#else - Stype S[ARCFOUR_STATE_SIZE]; - Stype i; - Stype j; -#endif -}; - -/* - * 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 -}; - -RC4Context * -RC4_AllocateContext(void) -{ - return PORT_ZNew(RC4Context); -} - -SECStatus -RC4_InitContext(RC4Context *cx, const unsigned char *key, unsigned int len, - const unsigned char * unused1, int unused2, - unsigned int unused3, unsigned int unused4) -{ - unsigned int i; - PRUint8 j, tmp; - 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_BAD_KEY); - return SECFailure; - } - if (cx == NULL) { - PORT_SetError(SEC_ERROR_INVALID_ARGS); - return SECFailure; - } - /* 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 SECSuccess; -} - - -/* - * Initialize a new generator. - */ -RC4Context * -RC4_CreateContext(const unsigned char *key, int len) -{ - RC4Context *cx = RC4_AllocateContext(); - if (cx) { - SECStatus rv = RC4_InitContext(cx, key, len, NULL, 0, 0, 0); - if (rv != SECSuccess) { - PORT_ZFree(cx, sizeof(*cx)); - cx = NULL; - } - } - return cx; -} - -void -RC4_DestroyContext(RC4Context *cx, PRBool freeit) -{ - if (freeit) - PORT_ZFree(cx, sizeof(*cx)); -} - -#if defined(NSS_BEVAND_ARCFOUR) -extern void ARCFOUR(RC4Context *cx, WORD inputLen, - const unsigned char *input, unsigned char *output); -#else -/* - * 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 ARCFOUR 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_OUTPUT_LEN); - 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; -} - -#else -/* !CONVERT_TO_WORDS */ - -/* - * Byte-at-a-time ARCFOUR, 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_OUTPUT_LEN); - 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(IS_64) && !defined(__sparc)) || 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 IS_LITTLE_ENDIAN -#define LEFTMOST_BYTE_SHIFT 0 -#define NEXT_BYTE_SHIFT(shift) shift + 8 -#else -#define LEFTMOST_BYTE_SHIFT 8*(WORDSIZE - 1) -#define NEXT_BYTE_SHIFT(shift) shift - 8 -#endif - -#ifdef CONVERT_TO_WORDS -static SECStatus -rc4_wordconv(RC4Context *cx, unsigned char *output, - unsigned int *outputLen, unsigned int maxOutputLen, - const unsigned char *input, unsigned int inputLen) -{ - PR_STATIC_ASSERT(sizeof(PRUword) == sizeof(ptrdiff_t)); - unsigned int inOffset = (PRUword)input % WORDSIZE; - unsigned int outOffset = (PRUword)output % WORDSIZE; - register WORD streamWord; - register const WORD *pInWord; - register WORD *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; - unsigned int i; - const unsigned char *finalIn; - unsigned char *finalOut; - - PORT_Assert(maxOutputLen >= inputLen); - if (maxOutputLen < inputLen) { - PORT_SetError(SEC_ERROR_OUTPUT_LEN); - 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 = (const WORD *)(input - inOffset); - pOutWord = (WORD *)(output - outOffset); - 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) { - byteCount = WORDSIZE - outOffset; - for (i = 0; i < byteCount; i++) { - ARCFOUR_NEXT_BYTE(); - output[i] = cx->S[t] ^ input[i]; - } - /* Consumed byteCount bytes of input */ - inputLen -= byteCount; - pInWord++; - - /* move to next word of output */ - pOutWord++; - - /* If buffers are relatively misaligned, shift the bytes in inWord - * to be aligned to the output buffer. - */ - if (inOffset < outOffset) { - /* The first input word (which may be partial) has more bytes - * than needed. Copy the remainder to inWord. - */ - unsigned int shift = LEFTMOST_BYTE_SHIFT; - inWord = 0; - for (i = 0; i < outOffset - inOffset; i++) { - inWord |= (WORD)input[byteCount + i] << shift; - shift = NEXT_BYTE_SHIFT(shift); - } - } else if (inOffset > outOffset) { - /* Consumed some bytes in the second input word. Copy the - * remainder to inWord. - */ - inWord = *pInWord++; - inWord = inWord LSH invBufShift; - } else { - inWord = 0; - } - } else { - /* output is word-aligned */ - 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. - */ - unsigned int shift = LEFTMOST_BYTE_SHIFT; - inWord = 0; - for (i = 0; i < WORDSIZE - inOffset; i++) { - inWord |= (WORD)input[i] << shift; - shift = NEXT_BYTE_SHIFT(shift); - } - pInWord++; - } 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; - } - finalIn = (const unsigned char *)pInWord - WORDSIZE + inOffset; - } 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; - } - finalIn = (const unsigned char *)pInWord; - } - /*****************************************************************/ - /* Step 3: */ - /* Do the remaining partial word of input one byte at a time. */ - /*****************************************************************/ - finalOut = (unsigned char *)pOutWord; - for (i = 0; i < inputLen; i++) { - ARCFOUR_NEXT_BYTE(); - finalOut[i] = cx->S[t] ^ finalIn[i]; - } - cx->i = tmpi; - cx->j = tmpj; - return SECSuccess; -} -#endif -#endif /* NSS_BEVAND_ARCFOUR */ - -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_OUTPUT_LEN); - return SECFailure; - } -#if defined(NSS_BEVAND_ARCFOUR) - ARCFOUR(cx, inputLen, input, output); - *outputLen = inputLen; - return SECSuccess; -#elif defined( 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_OUTPUT_LEN); - return SECFailure; - } - /* decrypt and encrypt are same operation. */ -#if defined(NSS_BEVAND_ARCFOUR) - ARCFOUR(cx, inputLen, input, output); - *outputLen = inputLen; - return SECSuccess; -#elif defined( 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_WORD |