MD5算法研究 |
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axsoft
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假設Mj表示消息的第j個子分組(從0到15),<< FF(a,b,c,d,Mj,s,ti)表示a=b ((a (F(b,c,d) Mj ti)<< GG(a,b,c,d,Mj,s,ti)表示a=b ((a (G(b,c,d) Mj ti)<< HH(a,b,c,d,Mj,s,ti)表示a=b ((a (H(b,c,d) Mj ti)<< II(a,b,c,d,Mj,s,ti)表示a=b ((a (I(b,c,d) Mj ti)<< 這四輪(64步)是: 第一輪 FF(a,b,c,d,M0,7,0xd76aa478) FF(d,a,b,c,M1,12,0xe8c7b756) FF(c,d,a,b,M2,17,0x242070db) FF(b,c,d,a,M3,22,0xc1bdceee) FF(a,b,c,d,M4,7,0xf57c0faf) FF(d,a,b,c,M5,12,0x4787c62a) FF(c,d,a,b,M6,17,0xa8304613) FF(b,c,d,a,M7,22,0xfd469501) FF(a,b,c,d,M8,7,0x698098d8) FF(d,a,b,c,M9,12,0x8b44f7af) FF(c,d,a,b,M10,17,0xffff5bb1) FF(b,c,d,a,M11,22,0x895cd7be) FF(a,b,c,d,M12,7,0x6b901122) FF(d,a,b,c,M13,12,0xfd987193) FF(c,d,a,b,M14,17,0xa679438e) FF(b,c,d,a,M15,22,0x49b40821) 第二輪 GG(a,b,c,d,M1,5,0xf61e2562) GG(d,a,b,c,M6,9,0xc040b340) GG(c,d,a,b,M11,14,0x265e5a51) GG(b,c,d,a,M0,20,0xe9b6c7aa) GG(a,b,c,d,M5,5,0xd62f105d) GG(d,a,b,c,M10,9,0x02441453) GG(c,d,a,b,M15,14,0xd8a1e681) GG(b,c,d,a,M4,20,0xe7d3fbc8) GG(a,b,c,d,M9,5,0x21e1cde6) GG(d,a,b,c,M14,9,0xc33707d6) GG(c,d,a,b,M3,14,0xf4d50d87) GG(b,c,d,a,M8,20,0x455a14ed) GG(a,b,c,d,M13,5,0xa9e3e905) GG(d,a,b,c,M2,9,0xfcefa3f8) GG(c,d,a,b,M7,14,0x676f02d9) GG(b,c,d,a,M12,20,0x8d2a4c8a) 第三輪 HH(a,b,c,d,M5,4,0xfffa3942) HH(d,a,b,c,M8,11,0x8771f681) HH(c,d,a,b,M11,16,0x6d9d6122) HH(b,c,d,a,M14,23,0xfde5380c) HH(a,b,c,d,M1,4,0xa4beea44) HH(d,a,b,c,M4,11,0x4bdecfa9) HH(c,d,a,b,M7,16,0xf6bb4b60) HH(b,c,d,a,M10,23,0xbebfbc70) HH(a,b,c,d,M13,4,0x289b7ec6) HH(d,a,b,c,M0,11,0xeaa127fa) HH(c,d,a,b,M3,16,0xd4ef3085) HH(b,c,d,a,M6,23,0x04881d05) HH(a,b,c,d,M9,4,0xd9d4d039) HH(d,a,b,c,M12,11,0xe6db99e5) HH(c,d,a,b,M15,16,0x1fa27cf8) HH(b,c,d,a,M2,23,0xc4ac5665) 第四輪 II(a,b,c,d,M0,6,0xf4292244) II(d,a,b,c,M7,10,0x432aff97) II(c,d,a,b,M14,15,0xab9423a7) II(b,c,d,a,M5,21,0xfc93a039) II(a,b,c,d,M12,6,0x655b59c3) II(d,a,b,c,M3,10,0x8f0ccc92) II(c,d,a,b,M10,15,0xffeff47d) II(b,c,d,a,M1,21,0x85845dd1) II(a,b,c,d,M8,6,0x6fa87e4f) II(d,a,b,c,M15,10,0xfe2ce6e0) II(c,d,a,b,M6,15,0xa3014314) II(b,c,d,a,M13,21,0x4e0811a1) II(a,b,c,d,M4,6,0xf7537e82) II(d,a,b,c,M11,10,0xbd3af235) II(c,d,a,b,M2,15,0x2ad7d2bb) II(b,c,d,a,M9,21,0xeb86d391) 常數ti可以如下選擇: 在第i步中,ti是4294967296*abs(sin(i))的整數部分,i的單位是弧度。(4294967296等於2的32次方) 所有這些完成之後,將A、B、C、D分別加上a、b、c、d。然後用下一分組數據繼續運行算法,最後的輸出是A、B、C和D的級聯。 當你按照我上面所說的方法實現MD5算法以後,你可以用以下幾個信息對你做出來的程序作一個簡單的測試,看看程序有沒有錯誤。 MD5 ("") = d41d8cd98f00b204e9800998ecf8427e MD5 ("a") = 0cc175b9c0f1b6a831c399e269772661 MD5 ("abc") = 900150983cd24fb0d6963f7d28e17f72 MD5 ("message digest") = f96b697d7cb7938d525a2f31aaf161d0 MD5 ("abcdefghijklmnopqrstuvwxyz") = c3fcd3d76192e4007dfb496cca67e13b MD5 ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789") = d174ab98d277d9f5a5611c2c9f419d9f MD5 ("123456789012345678901234567890123456789012345678901234567890123456789 01234567890") = 57edf4a22be3c955ac49da2e2107b67a 如果你用上面的信息分別對你做的MD5算法實例做測試,最後得出的結論和標準答案完全一樣,那我就要在這裡象你道一聲祝賀了。要知道,我的程序在第一次編譯成功的時候是沒有得出和上面相同的結果的。 MD5的安全性 MD5相對MD4所作的改進: 1. 增加了第四輪; 2. 每一步均有唯一的加法常數; 3. 為減弱第二輪中函數G的對稱性從(X&Y)|(X&Z)|(Y&Z)變為(X&Z)|(Y&(~Z)); 4. 第一步加上了上一步的結果,這將引起更快的雪崩效應; 5. 改變了第二輪和第三輪中訪問消息子分組的次序,使其更不相似; 6. 近似優化了每一輪中的循環左移位移量以實現更快的雪崩效應。各輪的位移量互不相同。網路志工聯盟----Visita網站http://www.vista.org.tw ---[ 發問前請先找找舊文章 ]--- 發表人 - axsoft 於 2002/12/13 11:17:41 |
axsoft
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/****************************************************************************** * Copyright (C) 2000 by Robert Hubley. * * All rights reserved. * * * * This software is provided ``AS IS'' and any express or implied * * warranties, including, but not limited to, the implied warranties of * * merchantability and fitness for a particular purpose, are disclaimed. * * In no event shall the authors be liable for any direct, indirect, * * incidental, special, exemplary, or consequential damages (including, but * * not limited to, procurement of substitute goods or services; loss of use, * * data, or profits; or business interruption) however caused and on any * * theory of liability, whether in contract, strict liability, or tort * * (including negligence or otherwise) arising in any way out of the use of * * this software, even if advised of the possibility of such damage. * * * ****************************************************************************** MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm Port to Win32 DLL by Robert Hubley 1/5/2000 Original Copyright: Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All rights reserved. License to copy and use this software is granted provided that it is identified as the "RSA Data Security, Inc. MD5 Message-Digest Algorithm" in all material mentioning or referencing this software or this function. License is also granted to make and use derivative works provided that such works are identified as "derived from the RSA Data Security, Inc. MD5 Message-Digest Algorithm" in all material mentioning or referencing the derived work. RSA Data Security, Inc. makes no representations concerning either the merchantability of this software or the suitability of this software for any particular purpose. It is provided "as is" without express or implied warranty of any kind. These notices must be retained in any copies of any part of this documentation and/or software. */ #include "md5.h" /* Constants for MD5Transform routine. */ #define S11 7 #define S12 12 #define S13 17 #define S14 22 #define S21 5 #define S22 9 #define S23 14 #define S24 20 #define S31 4 #define S32 11 #define S33 16 #define S34 23 #define S41 6 #define S42 10 #define S43 15 #define S44 21 /* F, G, H and I are basic MD5 functions. */ #define F(x, y, z) (((x) & (y)) | ((~x) & (z))) #define G(x, y, z) (((x) & (z)) | ((y) & (~z))) #define H(x, y, z) ((x) ^ (y) ^ (z)) #define I(x, y, z) ((y) ^ ((x) | (~z))) /* ROTATE_LEFT rotates x left n bits. */ #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. Rotation is separate from addition to prevent recomputation. */ #define FF(a, b, c, d, x, s, ac) { (a) = F ((b), (c), (d)) (x) (unsigned long int)(ac); (a) = ROTATE_LEFT ((a), (s)); (a) = (b); } #define GG(a, b, c, d, x, s, ac) { (a) = G ((b), (c), (d)) (x) (unsigned long int)(ac); (a) = ROTATE_LEFT ((a), (s)); (a) = (b); } #define HH(a, b, c, d, x, s, ac) { (a) = H ((b), (c), (d)) (x) (unsigned long int)(ac); (a) = ROTATE_LEFT ((a), (s)); (a) = (b); } #define II(a, b, c, d, x, s, ac) { (a) = I ((b), (c), (d)) (x) (unsigned long int)(ac); (a) = ROTATE_LEFT ((a), (s)); (a) = (b); } /* MD5 initialization. Begins an MD5 operation, writing a new context. */ MD5_CTX::MD5_CTX() { MD5Init (); } MD5_CTX::~MD5_CTX() { } void MD5_CTX::MD5Init () { this->count[0] = this->count[1] = 0; /* Load magic initialization constants.*/ this->state[0] = 0x67452301; this->state[1] = 0xefcdab89; this->state[2] = 0x98badcfe; this->state[3] = 0x10325476; /* Add by Liguangyi */ MD5_memset(PADDING, 0, sizeof(PADDING)); *PADDING=0x80; //PADDING = { //0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, //0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, //0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; } /* MD5 block update operation. Continues an MD5 message-digest operation, processing another message block, and updating the context. */ void MD5_CTX::MD5Update (unsigned char *input,unsigned int inputLen) { unsigned int i, index, partLen; /* Compute number of bytes mod 64 */ index = (unsigned int)((this->count[0] >> 3) & 0x3F); /* Update number of bits */ if ((this->count[0] = ((unsigned long int)inputLen << 3)) < ((unsigned long int)inputLen << 3)) this->count[1] ; this->count[1] = ((unsigned long int)inputLen >> 29); partLen = 64 - index; /* Transform as many times as possible. */ if (inputLen >= partLen) { MD5_memcpy((unsigned char*)&this->buffer[index], (unsigned char*)input, partLen); MD5Transform (this->state, this->buffer); for (i = partLen; i 63 < inputLen; i = 64) MD5Transform (this->state, &input[i]); index = 0; } else i = 0; /* Buffer remaining input */ MD5_memcpy ((unsigned char*)&this->buffer[index], (unsigned char*)&input[i], inputLen-i); } /* MD5 finalization. Ends an MD5 message-digest operation, writing the the message digest and zeroizing the context. */ void MD5_CTX::MD5Final (unsigned char digest[16]) { unsigned char bits[8]; unsigned int index, padLen; /* Save number of bits */ Encode (bits, this->count, 8); /* Pad out to 56 mod 64. */ index = (unsigned int)((this->count[0] >> 3) & 0x3f); padLen = (index < 56) ? (56 - index) : (120 - index); MD5Update ( PADDING, padLen); /* Append length (before padding) */ MD5Update (bits, 8); /* Store state in digest */ Encode (digest, this->state, 16); /* Zeroize sensitive information. */ MD5_memset ((unsigned char*)this, 0, sizeof (*this)); this->MD5Init(); } /* MD5 basic transformation. Transforms state based on block. */ void MD5_CTX::MD5Transform (unsigned long int state[4], unsigned char block[64]) { unsigned long int a = state[0], b = state[1], c = state[2], d = state[3], x[16]; Decode (x, block, 64); /* Round 1 */ FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */ FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */ FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */ FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */ FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */ FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */ FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */ FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */ FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */ FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */ FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */ FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */ FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */ FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */ FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */ FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */ /* Round 2 */ GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */ GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */ GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */ GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */ GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */ GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */ GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */ GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */ GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */ GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */ GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */ GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */ GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */ GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */ GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */ GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */ /* Round 3 */ HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */ HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */ HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */ HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */ HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */ HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */ HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */ HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */ HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */ HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */ HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */ HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */ HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */ HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */ HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */ HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */ /* Round 4 */ II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */ II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */ II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */ II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */ II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */ II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */ II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */ II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */ II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */ II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */ II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */ II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */ II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */ II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */ II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */ II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */ state[0] = a; state[1] = b; state[2] = c; state[3] = d; /* Zeroize sensitive information. */ MD5_memset ((unsigned char*)x, 0, sizeof (x)); } /* Encodes input (unsigned long int) into output (unsigned char). Assumes len is a multiple of 4. */ void MD5_CTX::Encode (unsigned char *output, unsigned long int *input,unsigned int len) { unsigned int i, j; for (i = 0, j = 0; j < len; i , j = 4) { output[j] = (unsigned char)(input[i] & 0xff); output[j 1] = (unsigned char)((input[i] >> 8) & 0xff); output[j 2] = (unsigned char)((input[i] >> 16) & 0xff); output[j 3] = (unsigned char)((input[i] >> 24) & 0xff); } } /* Decodes input (unsigned char) into output (unsigned long int). Assumes len is a multiple of 4. */ void MD5_CTX::Decode (unsigned long int *output, unsigned char *input, unsigned int len) { unsigned int i, j; for (i = 0, j = 0; j < len; i , j = 4) output[i] = ((unsigned long int)input[j]) | (((unsigned long int)input[j 1]) << 8) | (((unsigned long int)input[j 2]) << 16) | (((unsigned long int)input[j 3]) << 24); } /* Note: Replace "for loop" with standard memcpy if possible. */ void MD5_CTX::MD5_memcpy (unsigned char* output, unsigned char* input,unsigned int len) { unsigned int i; for (i = 0; i < len; i ) output[i] = input[i]; } /* Note: Replace "for loop" with standard memset if possible. */ void MD5_CTX::MD5_memset (unsigned char* output,int value,unsigned int len) { unsigned int i; for (i = 0; i < len; i ) ((char *)output)[i] = (char)value; } /****************************************************************************** * Copyright (C) 2000 by Robert Hubley. * * All rights reserved. * * * * This software is provided ``AS IS'' and any express or implied * * warranties, including, but not limited to, the implied warranties of * * merchantability and fitness for a particular purpose, are disclaimed. * * In no event shall the authors be liable for any direct, indirect, * * incidental, special, exemplary, or consequential damages (including, but * * not limited to, procurement of substitute goods or services; loss of use, * * data, or profits; or business interruption) however caused and on any * * theory of liability, whether in contract, strict liability, or tort * * (including negligence or otherwise) arising in any way out of the use of * * this software, even if advised of the possibility of such damage. * * * ****************************************************************************** MD5.H - header file for MD5C.C Port to Win32 DLL by Robert Hubley 1/5/2000 Original Copyright: Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All rights reserved. License to copy and use this software is granted provided that it is identified as the "RSA Data Security, Inc. MD5 Message-Digest Algorithm" in all material mentioning or referencing this software or this function. License is also granted to make and use derivative works provided that such works are identified as "derived from the RSA Data Security, Inc. MD5 Message-Digest Algorithm" in all material mentioning or referencing the derived work. RSA Data Security, Inc. makes no representations concerning either the merchantability of this software or the suitability of this software for any particular purpose. It is provided "as is" without express or implied warranty of any kind. These notices must be retained in any copies of any part of this documentation and/or software. */ /****************************************************************************** * Copyright (C) 2000 by Robert Hubley. * * All rights reserved. * * * * This software is provided ``AS IS'' and any express or implied * * warranties, including, but not limited to, the implied warranties of * * merchantability and fitness for a particular purpose, are disclaimed. * * In no event shall the authors be liable for any direct, indirect, * * incidental, special, exemplary, or consequential damages (including, but * * not limited to, procurement of substitute goods or services; loss of use, * * data, or profits; or business interruption) however caused and on any * * theory of liability, whether in contract, strict liability, or tort * * (including negligence or otherwise) arising in any way out of the use of * * this software, even if advised of the possibility of such damage. * * * ****************************************************************************** */ /****************************************************************************** * 2002-4-18 Modified by Liguangyi. * * struct MD5_CTX ==> class MD5_CTX. * * Take off the Globals Functions * ****************************************************************************** */ #ifndef _LGY_MD5_H #define _LGY_MD5_H /* MD5 Class. */ class MD5_CTX { public: MD5_CTX(); virtual ~MD5_CTX(); void MD5Update ( unsigned char *input, unsigned int inputLen); void MD5Final (unsigned char digest[16]); private: unsigned long int state[4];/* state (ABCD) */ unsigned long int count[2];/* number of bits, modulo 2^64 (lsb first) */ unsigned char buffer[64]; /* input buffer */ unsigned char PADDING[64];/* What? */ private: void MD5Init (); void MD5Transform (unsigned long int state[4], unsigned char block[64]); void MD5_memcpy (unsigned char* output, unsigned char* input,unsigned int len); void Encode (unsigned char *output, unsigned long int *input,unsigned int len); void Decode (unsigned long int *output, unsigned char *input, unsigned int len); void MD5_memset (unsigned char* output,int value,unsigned int len); }; #endif網路志工聯盟----Visita網站http://www.vista.org.tw ---[ 發問前請先找找舊文章 ]--- |
bruce0211
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【文章】取得檔案 MD5 值副函式 (有 bcb & delphi 版)
【作者】源碼任務 bruce0211@yahoo.com.tw 2005/08/08
【內文】心得分享系列 ■前言 目前因工作專案, 急須一個取得檔案 MD5 值的副函式 , 由於環境限制無法外掛 DLL ,
結果找遍所有資料 , 不是不支援 BCB , 就是號稱支援 BCB 的 DELPHI 元件或單元 ,
有語法上的問題(不知該元件作者到底有無在 BCB 上測過 ??) , 根本無法轉給 BCB 用
INDY 內有個單元叫 IdHashMessageDigest.pas , 有支援取得檔案 MD5 值的函式 ,
但不是每個 INDY 版本都有附這個單元 , 且在 BCB 上仍有問題 , 所以火大 , 參照
INDY 原始碼 , 直接寫成 BCB 副函式 , 以後就不用再靠那些裝不起來的元件或是
內部黑箱作業的 DLL ■原文請見
http://delphi.ktop.com.tw/topic.php?TOPIC_ID=18760
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