The Tor Browser: security/nss/lib/freebl/arcfour.c@6474c204b198 (annotated)

security/nss/lib/freebl/arcfour.c@6474c204b198 (annotated)

security/nss/lib/freebl/arcfour.c

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* 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) || defined(NSS_BEVAND_ARCFOUR)
 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] = {
 x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
 x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
 x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
 x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
 x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
 x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
 x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
 x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
 x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
 x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
 x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
 x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
 x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
 x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
 x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
 x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
 x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
 x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
 x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
 x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
 xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
 xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
 xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,
 xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
 xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
 xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
 xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
 xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
 xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
 xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
 xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
 xf8, 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 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) {
 		unsigned int 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;
 		}
 	}
 	/*****************************************************************/
 	/* 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 (bufShift) {
 		/* preloadedByteCount is the number of input bytes pre-loaded
 		 * in inWord.
 		 */
 		unsigned int preloadedByteCount = bufShift/8;
 		for (; inputLen >= preloadedByteCount + 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 - preloadedByteCount;
 	} 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

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security/nss/lib/freebl/arcfour.c@6474c204b198 (annotated)

security/nss/lib/freebl/arcfour.c