DES和3DES加密算法C语言实现【转】

转自：https://blog.csdn.net/leumber/article/details/78043675

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DES和3DES加密算法C语言实现
记录DES和3DES加密算法最简洁易懂的C语言源码
主要是要用到CBC这部分的算法，后边也有一个工具可以提供验证，因为网上的工具含有CBC的很少，也方便大家吧

#define MBEDTLS_DES_ENCRYPT     1  
#define MBEDTLS_DES_DECRYPT     0  

#define MBEDTLS_ERR_DES_INVALID_INPUT_LENGTH              -0x0002 /**< The data input has an invalid length. */  

#define MBEDTLS_DES_KEY_SIZE    8  
#define DES_KEY_SIZE (8) #define DES3_KEY2_SIZE (16) #define DES3_KEY3_SIZE (24) typedef struct { uint32_t sk[32]; /*!< DES subkeys */ }des_context; /** * \brief Triple-DES context structure */ typedef struct { uint32_t sk[96]; /*!< 3DES subkeys */ }des3_context; #define DES_C #if defined(DES_C) #include "des.h" #include <string.h> #include <stdlib.h> #if !defined(DES_ALT) /* Implementation that should never be optimized out by the compiler */ static void zeroize( void *v, size_t n ) { volatile unsigned char *p = (unsigned char*)v; while( n-- ) *p++ = 0; } /* * 32-bit integer manipulation macros (big endian) */ #ifndef GET_UINT32_BE #define GET_UINT32_BE(n,b,i) \ { \ (n) = ( (uint32_t) (b)[(i) ] << 24 ) \ | ( (uint32_t) (b)[(i) + 1] << 16 ) \ | ( (uint32_t) (b)[(i) + 2] << 8 ) \ | ( (uint32_t) (b)[(i) + 3] ); \ } #endif #ifndef PUT_UINT32_BE #define PUT_UINT32_BE(n,b,i) \ { \ (b)[(i) ] = (unsigned char) ( (n) >> 24 ); \ (b)[(i) + 1] = (unsigned char) ( (n) >> 16 ); \ (b)[(i) + 2] = (unsigned char) ( (n) >> 8 ); \ (b)[(i) + 3] = (unsigned char) ( (n) ); \ } #endif /* * Expanded DES S-boxes */ static const uint32_t SB1[64] = { 0x01010400, 0x00000000, 0x00010000, 0x01010404, 0x01010004, 0x00010404, 0x00000004, 0x00010000, 0x00000400, 0x01010400, 0x01010404, 0x00000400, 0x01000404, 0x01010004, 0x01000000, 0x00000004, 0x00000404, 0x01000400, 0x01000400, 0x00010400, 0x00010400, 0x01010000, 0x01010000, 0x01000404, 0x00010004, 0x01000004, 0x01000004, 0x00010004, 0x00000000, 0x00000404, 0x00010404, 0x01000000, 0x00010000, 0x01010404, 0x00000004, 0x01010000, 0x01010400, 0x01000000, 0x01000000, 0x00000400, 0x01010004, 0x00010000, 0x00010400, 0x01000004, 0x00000400, 0x00000004, 0x01000404, 0x00010404, 0x01010404, 0x00010004, 0x01010000, 0x01000404, 0x01000004, 0x00000404, 0x00010404, 0x01010400, 0x00000404, 0x01000400, 0x01000400, 0x00000000, 0x00010004, 0x00010400, 0x00000000, 0x01010004 }; static const uint32_t SB2[64] = { 0x80108020, 0x80008000, 0x00008000, 0x00108020, 0x00100000, 0x00000020, 0x80100020, 0x80008020, 0x80000020, 0x80108020, 0x80108000, 0x80000000, 0x80008000, 0x00100000, 0x00000020, 0x80100020, 0x00108000, 0x00100020, 0x80008020, 0x00000000, 0x80000000, 0x00008000, 0x00108020, 0x80100000, 0x00100020, 0x80000020, 0x00000000, 0x00108000, 0x00008020, 0x80108000, 0x80100000, 0x00008020, 0x00000000, 0x00108020, 0x80100020, 0x00100000, 0x80008020, 0x80100000, 0x80108000, 0x00008000, 0x80100000, 0x80008000, 0x00000020, 0x80108020, 0x00108020, 0x00000020, 0x00008000, 0x80000000, 0x00008020, 0x80108000, 0x00100000, 0x80000020, 0x00100020, 0x80008020, 0x80000020, 0x00100020, 0x00108000, 0x00000000, 0x80008000, 0x00008020, 0x80000000, 0x80100020, 0x80108020, 0x00108000 }; static const uint32_t SB3[64] = { 0x00000208, 0x08020200, 0x00000000, 0x08020008, 0x08000200, 0x00000000, 0x00020208, 0x08000200, 0x00020008, 0x08000008, 0x08000008, 0x00020000, 0x08020208, 0x00020008, 0x08020000, 0x00000208, 0x08000000, 0x00000008, 0x08020200, 0x00000200, 0x00020200, 0x08020000, 0x08020008, 0x00020208, 0x08000208, 0x00020200, 0x00020000, 0x08000208, 0x00000008, 0x08020208, 0x00000200, 0x08000000, 0x08020200, 0x08000000, 0x00020008, 0x00000208, 0x00020000, 0x08020200, 0x08000200, 0x00000000, 0x00000200, 0x00020008, 0x08020208, 0x08000200, 0x08000008, 0x00000200, 0x00000000, 0x08020008, 0x08000208, 0x00020000, 0x08000000, 0x08020208, 0x00000008, 0x00020208, 0x00020200, 0x08000008, 0x08020000, 0x08000208, 0x00000208, 0x08020000, 0x00020208, 0x00000008, 0x08020008, 0x00020200 }; static const uint32_t SB4[64] = { 0x00802001, 0x00002081, 0x00002081, 0x00000080, 0x00802080, 0x00800081, 0x00800001, 0x00002001, 0x00000000, 0x00802000, 0x00802000, 0x00802081, 0x00000081, 0x00000000, 0x00800080, 0x00800001, 0x00000001, 0x00002000, 0x00800000, 0x00802001, 0x00000080, 0x00800000, 0x00002001, 0x00002080, 0x00800081, 0x00000001, 0x00002080, 0x00800080, 0x00002000, 0x00802080, 0x00802081, 0x00000081, 0x00800080, 0x00800001, 0x00802000, 0x00802081, 0x00000081, 0x00000000, 0x00000000, 0x00802000, 0x00002080, 0x00800080, 0x00800081, 0x00000001, 0x00802001, 0x00002081, 0x00002081, 0x00000080, 0x00802081, 0x00000081, 0x00000001, 0x00002000, 0x00800001, 0x00002001, 0x00802080, 0x00800081, 0x00002001, 0x00002080, 0x00800000, 0x00802001, 0x00000080, 0x00800000, 0x00002000, 0x00802080 }; static const uint32_t SB5[64] = { 0x00000100, 0x02080100, 0x02080000, 0x42000100, 0x00080000, 0x00000100, 0x40000000, 0x02080000, 0x40080100, 0x00080000, 0x02000100, 0x40080100, 0x42000100, 0x42080000, 0x00080100, 0x40000000, 0x02000000, 0x40080000, 0x40080000, 0x00000000, 0x40000100, 0x42080100, 0x42080100, 0x02000100, 0x42080000, 0x40000100, 0x00000000, 0x42000000, 0x02080100, 0x02000000, 0x42000000, 0x00080100, 0x00080000, 0x42000100, 0x00000100, 0x02000000, 0x40000000, 0x02080000, 0x42000100, 0x40080100, 0x02000100, 0x40000000, 0x42080000, 0x02080100, 0x40080100, 0x00000100, 0x02000000, 0x42080000, 0x42080100, 0x00080100, 0x42000000, 0x42080100, 0x02080000, 0x00000000, 0x40080000, 0x42000000, 0x00080100, 0x02000100, 0x40000100, 0x00080000, 0x00000000, 0x40080000, 0x02080100, 0x40000100 }; static const uint32_t SB6[64] = { 0x20000010, 0x20400000, 0x00004000, 0x20404010, 0x20400000, 0x00000010, 0x20404010, 0x00400000, 0x20004000, 0x00404010, 0x00400000, 0x20000010, 0x00400010, 0x20004000, 0x20000000, 0x00004010, 0x00000000, 0x00400010, 0x20004010, 0x00004000, 0x00404000, 0x20004010, 0x00000010, 0x20400010, 0x20400010, 0x00000000, 0x00404010, 0x20404000, 0x00004010, 0x00404000, 0x20404000, 0x20000000, 0x20004000, 0x00000010, 0x20400010, 0x00404000, 0x20404010, 0x00400000, 0x00004010, 0x20000010, 0x00400000, 0x20004000, 0x20000000, 0x00004010, 0x20000010, 0x20404010, 0x00404000, 0x20400000, 0x00404010, 0x20404000, 0x00000000, 0x20400010, 0x00000010, 0x00004000, 0x20400000, 0x00404010, 0x00004000, 0x00400010, 0x20004010, 0x00000000, 0x20404000, 0x20000000, 0x00400010, 0x20004010 }; static const uint32_t SB7[64] = { 0x00200000, 0x04200002, 0x04000802, 0x00000000, 0x00000800, 0x04000802, 0x00200802, 0x04200800, 0x04200802, 0x00200000, 0x00000000, 0x04000002, 0x00000002, 0x04000000, 0x04200002, 0x00000802, 0x04000800, 0x00200802, 0x00200002, 0x04000800, 0x04000002, 0x04200000, 0x04200800, 0x00200002, 0x04200000, 0x00000800, 0x00000802, 0x04200802, 0x00200800, 0x00000002, 0x04000000, 0x00200800, 0x04000000, 0x00200800, 0x00200000, 0x04000802, 0x04000802, 0x04200002, 0x04200002, 0x00000002, 0x00200002, 0x04000000, 0x04000800, 0x00200000, 0x04200800, 0x00000802, 0x00200802, 0x04200800, 0x00000802, 0x04000002, 0x04200802, 0x04200000, 0x00200800, 0x00000000, 0x00000002, 0x04200802, 0x00000000, 0x00200802, 0x04200000, 0x00000800, 0x04000002, 0x04000800, 0x00000800, 0x00200002 }; static const uint32_t SB8[64] = { 0x10001040, 0x00001000, 0x00040000, 0x10041040, 0x10000000, 0x10001040, 0x00000040, 0x10000000, 0x00040040, 0x10040000, 0x10041040, 0x00041000, 0x10041000, 0x00041040, 0x00001000, 0x00000040, 0x10040000, 0x10000040, 0x10001000, 0x00001040, 0x00041000, 0x00040040, 0x10040040, 0x10041000, 0x00001040, 0x00000000, 0x00000000, 0x10040040, 0x10000040, 0x10001000, 0x00041040, 0x00040000, 0x00041040, 0x00040000, 0x10041000, 0x00001000, 0x00000040, 0x10040040, 0x00001000, 0x00041040, 0x10001000, 0x00000040, 0x10000040, 0x10040000, 0x10040040, 0x10000000, 0x00040000, 0x10001040, 0x00000000, 0x10041040, 0x00040040, 0x10000040, 0x10040000, 0x10001000, 0x10001040, 0x00000000, 0x10041040, 0x00041000, 0x00041000, 0x00001040, 0x00001040, 0x00040040, 0x10000000, 0x10041000 }; /* * PC1: left and right halves bit-swap */ static const uint32_t LHs[16] = { 0x00000000, 0x00000001, 0x00000100, 0x00000101, 0x00010000, 0x00010001, 0x00010100, 0x00010101, 0x01000000, 0x01000001, 0x01000100, 0x01000101, 0x01010000, 0x01010001, 0x01010100, 0x01010101 }; static const uint32_t RHs[16] = { 0x00000000, 0x01000000, 0x00010000, 0x01010000, 0x00000100, 0x01000100, 0x00010100, 0x01010100, 0x00000001, 0x01000001, 0x00010001, 0x01010001, 0x00000101, 0x01000101, 0x00010101, 0x01010101, }; /* * Initial Permutation macro */ #define DES_IP(X,Y) \ { \ T = ((X >> 4) ^ Y) & 0x0F0F0F0F; Y ^= T; X ^= (T << 4); \ T = ((X >> 16) ^ Y) & 0x0000FFFF; Y ^= T; X ^= (T << 16); \ T = ((Y >> 2) ^ X) & 0x33333333; X ^= T; Y ^= (T << 2); \ T = ((Y >> 8) ^ X) & 0x00FF00FF; X ^= T; Y ^= (T << 8); \ Y = ((Y << 1) | (Y >> 31)) & 0xFFFFFFFF; \ T = (X ^ Y) & 0xAAAAAAAA; Y ^= T; X ^= T; \ X = ((X << 1) | (X >> 31)) & 0xFFFFFFFF; \ } /* * Final Permutation macro */ #define DES_FP(X,Y) \ { \ X = ((X << 31) | (X >> 1)) & 0xFFFFFFFF; \ T = (X ^ Y) & 0xAAAAAAAA; X ^= T; Y ^= T; \ Y = ((Y << 31) | (Y >> 1)) & 0xFFFFFFFF; \ T = ((Y >> 8) ^ X) & 0x00FF00FF; X ^= T; Y ^= (T << 8); \ T = ((Y >> 2) ^ X) & 0x33333333; X ^= T; Y ^= (T << 2); \ T = ((X >> 16) ^ Y) & 0x0000FFFF; Y ^= T; X ^= (T << 16); \ T = ((X >> 4) ^ Y) & 0x0F0F0F0F; Y ^= T; X ^= (T << 4); \ } /* * DES round macro */ #define DES_ROUND(X,Y) \ { \ T = *SK++ ^ X; \ Y ^= SB8[ (T ) & 0x3F ] ^ \ SB6[ (T >> 8) & 0x3F ] ^ \ SB4[ (T >> 16) & 0x3F ] ^ \ SB2[ (T >> 24) & 0x3F ]; \ \ T = *SK++ ^ ((X << 28) | (X >> 4)); \ Y ^= SB7[ (T ) & 0x3F ] ^ \ SB5[ (T >> 8) & 0x3F ] ^ \ SB3[ (T >> 16) & 0x3F ] ^ \ SB1[ (T >> 24) & 0x3F ]; \ } #define SWAP(a,b) { uint32_t t = a; a = b; b = t; t = 0; } void des_init( des_context *ctx ) { memset( ctx, 0, sizeof( des_context ) ); } void des_free( des_context *ctx ) { if( ctx == NULL ) return; zeroize( ctx, sizeof( des_context ) ); } void des3_init( des3_context *ctx ) { memset( ctx, 0, sizeof( des3_context ) ); } void des3_free( des3_context *ctx ) { if( ctx == NULL ) return; zeroize( ctx, sizeof( des3_context ) ); } static const unsigned char odd_parity_table[128] = { 1, 2, 4, 7, 8, 11, 13, 14, 16, 19, 21, 22, 25, 26, 28, 31, 32, 35, 37, 38, 41, 42, 44, 47, 49, 50, 52, 55, 56, 59, 61, 62, 64, 67, 69, 70, 73, 74, 76, 79, 81, 82, 84, 87, 88, 91, 93, 94, 97, 98, 100, 103, 104, 107, 109, 110, 112, 115, 117, 118, 121, 122, 124, 127, 128, 131, 133, 134, 137, 138, 140, 143, 145, 146, 148, 151, 152, 155, 157, 158, 161, 162, 164, 167, 168, 171, 173, 174, 176, 179, 181, 182, 185, 186, 188, 191, 193, 194, 196, 199, 200, 203, 205, 206, 208, 211, 213, 214, 217, 218, 220, 223, 224, 227, 229, 230, 233, 234, 236, 239, 241, 242, 244, 247, 248, 251, 253, 254 }; void des_key_set_parity( unsigned char key[DES_KEY_SIZE] ) { int i; for( i = 0; i < DES_KEY_SIZE; i++ ) key[i] = odd_parity_table[key[i] / 2]; } /* * Check the given key's parity, returns 1 on failure, 0 on SUCCESS */ int des_key_check_key_parity( const unsigned char key[DES_KEY_SIZE] ) { int i; for( i = 0; i < DES_KEY_SIZE; i++ ) if( key[i] != odd_parity_table[key[i] / 2] ) return( 1 ); return( 0 ); } /* * Table of weak and semi-weak keys * * Source: http://en.wikipedia.org/wiki/Weak_key * * Weak: * Alternating ones + zeros (0x0101010101010101) * Alternating 'F' + 'E' (0xFEFEFEFEFEFEFEFE) * '0xE0E0E0E0F1F1F1F1' * '0x1F1F1F1F0E0E0E0E' * * Semi-weak: * 0x011F011F010E010E and 0x1F011F010E010E01 * 0x01E001E001F101F1 and 0xE001E001F101F101 * 0x01FE01FE01FE01FE and 0xFE01FE01FE01FE01 * 0x1FE01FE00EF10EF1 and 0xE01FE01FF10EF10E * 0x1FFE1FFE0EFE0EFE and 0xFE1FFE1FFE0EFE0E * 0xE0FEE0FEF1FEF1FE and 0xFEE0FEE0FEF1FEF1 * */ #define WEAK_KEY_COUNT 16 static const unsigned char weak_key_table[WEAK_KEY_COUNT][DES_KEY_SIZE] = { { 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01 }, { 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE }, { 0x1F, 0x1F, 0x1F, 0x1F, 0x0E, 0x0E, 0x0E, 0x0E }, { 0xE0, 0xE0, 0xE0, 0xE0, 0xF1, 0xF1, 0xF1, 0xF1 }, { 0x01, 0x1F, 0x01, 0x1F, 0x01, 0x0E, 0x01, 0x0E }, { 0x1F, 0x01, 0x1F, 0x01, 0x0E, 0x01, 0x0E, 0x01 }, { 0x01, 0xE0, 0x01, 0xE0, 0x01, 0xF1, 0x01, 0xF1 }, { 0xE0, 0x01, 0xE0, 0x01, 0xF1, 0x01, 0xF1, 0x01 }, { 0x01, 0xFE, 0x01, 0xFE, 0x01, 0xFE, 0x01, 0xFE }, { 0xFE, 0x01, 0xFE, 0x01, 0xFE, 0x01, 0xFE, 0x01 }, { 0x1F, 0xE0, 0x1F, 0xE0, 0x0E, 0xF1, 0x0E, 0xF1 }, { 0xE0, 0x1F, 0xE0, 0x1F, 0xF1, 0x0E, 0xF1, 0x0E }, { 0x1F, 0xFE, 0x1F, 0xFE, 0x0E, 0xFE, 0x0E, 0xFE }, { 0xFE, 0x1F, 0xFE, 0x1F, 0xFE, 0x0E, 0xFE, 0x0E }, { 0xE0, 0xFE, 0xE0, 0xFE, 0xF1, 0xFE, 0xF1, 0xFE }, { 0xFE, 0xE0, 0xFE, 0xE0, 0xFE, 0xF1, 0xFE, 0xF1 } }; int des_key_check_weak( const unsigned char key[DES_KEY_SIZE] ) { int i; for( i = 0; i < WEAK_KEY_COUNT; i++ ) if( memcmp( weak_key_table[i], key, DES_KEY_SIZE) == 0 ) return( 1 ); return( 0 ); } void des_setkey( uint32_t SK[32], const unsigned char key[DES_KEY_SIZE] ) { int i; uint32_t X, Y, T; GET_UINT32_BE( X, key, 0 ); GET_UINT32_BE( Y, key, 4 ); /* * Permuted Choice 1 */ T = ((Y >> 4) ^ X) & 0x0F0F0F0F; X ^= T; Y ^= (T << 4); T = ((Y ) ^ X) & 0x10101010; X ^= T; Y ^= (T ); X = (LHs[ (X ) & 0xF] << 3) | (LHs[ (X >> 8) & 0xF ] << 2) | (LHs[ (X >> 16) & 0xF] << 1) | (LHs[ (X >> 24) & 0xF ] ) | (LHs[ (X >> 5) & 0xF] << 7) | (LHs[ (X >> 13) & 0xF ] << 6) | (LHs[ (X >> 21) & 0xF] << 5) | (LHs[ (X >> 29) & 0xF ] << 4); Y = (RHs[ (Y >> 1) & 0xF] << 3) | (RHs[ (Y >> 9) & 0xF ] << 2) | (RHs[ (Y >> 17) & 0xF] << 1) | (RHs[ (Y >> 25) & 0xF ] ) | (RHs[ (Y >> 4) & 0xF] << 7) | (RHs[ (Y >> 12) & 0xF ] << 6) | (RHs[ (Y >> 20) & 0xF] << 5) | (RHs[ (Y >> 28) & 0xF ] << 4); X &= 0x0FFFFFFF; Y &= 0x0FFFFFFF; /* * calculate subkeys */ for( i = 0; i < 16; i++ ) { if( i < 2 || i == 8 || i == 15 ) { X = ((X << 1) | (X >> 27)) & 0x0FFFFFFF; Y = ((Y << 1) | (Y >> 27)) & 0x0FFFFFFF; } else { X = ((X << 2) | (X >> 26)) & 0x0FFFFFFF; Y = ((Y << 2) | (Y >> 26)) & 0x0FFFFFFF; } *SK++ = ((X << 4) & 0x24000000) | ((X << 28) & 0x10000000) | ((X << 14) & 0x08000000) | ((X << 18) & 0x02080000) | ((X << 6) & 0x01000000) | ((X << 9) & 0x00200000) | ((X >> 1) & 0x00100000) | ((X << 10) & 0x00040000) | ((X << 2) & 0x00020000) | ((X >> 10) & 0x00010000) | ((Y >> 13) & 0x00002000) | ((Y >> 4) & 0x00001000) | ((Y << 6) & 0x00000800) | ((Y >> 1) & 0x00000400) | ((Y >> 14) & 0x00000200) | ((Y ) & 0x00000100) | ((Y >> 5) & 0x00000020) | ((Y >> 10) & 0x00000010) | ((Y >> 3) & 0x00000008) | ((Y >> 18) & 0x00000004) | ((Y >> 26) & 0x00000002) | ((Y >> 24) & 0x00000001); *SK++ = ((X << 15) & 0x20000000) | ((X << 17) & 0x10000000) | ((X << 10) & 0x08000000) | ((X << 22) & 0x04000000) | ((X >> 2) & 0x02000000) | ((X << 1) & 0x01000000) | ((X << 16) & 0x00200000) | ((X << 11) & 0x00100000) | ((X << 3) & 0x00080000) | ((X >> 6) & 0x00040000) | ((X << 15) & 0x00020000) | ((X >> 4) & 0x00010000) | ((Y >> 2) & 0x00002000) | ((Y << 8) & 0x00001000) | ((Y >> 14) & 0x00000808) | ((Y >> 9) & 0x00000400) | ((Y ) & 0x00000200) | ((Y << 7) & 0x00000100) | ((Y >> 7) & 0x00000020) | ((Y >> 3) & 0x00000011) | ((Y << 2) & 0x00000004) | ((Y >> 21) & 0x00000002); } } /* * DES key schedule (56-bit, encryption) */ int des_setkey_enc( des_context *ctx, const unsigned char key[DES_KEY_SIZE] ) { des_setkey( ctx->sk, key ); return( 0 ); } /* * DES key schedule (56-bit, decryption) */ int des_setkey_dec( des_context *ctx, const unsigned char key[DES_KEY_SIZE] ) { int i; des_setkey( ctx->sk, key ); for( i = 0; i < 16; i += 2 ) { SWAP( ctx->sk[i ], ctx->sk[30 - i] ); SWAP( ctx->sk[i + 1], ctx->sk[31 - i] ); } return( 0 ); } static void des3_set2key( uint32_t esk[96], uint32_t dsk[96], const unsigned char key[DES_KEY_SIZE*2] ) { int i; des_setkey( esk, key ); des_setkey( dsk + 32, key + 8 ); for( i = 0; i < 32; i += 2 ) { dsk[i ] = esk[30 - i]; dsk[i + 1] = esk[31 - i]; esk[i + 32] = dsk[62 - i]; esk[i + 33] = dsk[63 - i]; esk[i + 64] = esk[i ]; esk[i + 65] = esk[i + 1]; dsk[i + 64] = dsk[i ]; dsk[i + 65] = dsk[i + 1]; } } /* * Triple-DES key schedule (112-bit, encryption) */ int des3_set2key_enc( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 2] ) { uint32_t sk[96]; des3_set2key( ctx->sk, sk, key ); zeroize( sk, sizeof( sk ) ); return( 0 ); } /* * Triple-DES key schedule (112-bit, decryption) */ int des3_set2key_dec( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 2] ) { uint32_t sk[96]; des3_set2key( sk, ctx->sk, key ); zeroize( sk, sizeof( sk ) ); return( 0 ); } static void des3_set3key( uint32_t esk[96], uint32_t dsk[96], const unsigned char key[24] ) { int i; des_setkey( esk, key ); des_setkey( dsk + 32, key + 8 ); des_setkey( esk + 64, key + 16 ); for( i = 0; i < 32; i += 2 ) { dsk[i ] = esk[94 - i]; dsk[i + 1] = esk[95 - i]; esk[i + 32] = dsk[62 - i]; esk[i + 33] = dsk[63 - i]; dsk[i + 64] = esk[30 - i]; dsk[i + 65] = esk[31 - i]; } } /* * Triple-DES key schedule (168-bit, encryption) */ int des3_set3key_enc( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 3] ) { uint32_t sk[96]; des3_set3key( ctx->sk, sk, key ); zeroize( sk, sizeof( sk ) ); return( 0 ); } /* * Triple-DES key schedule (168-bit, decryption) */ int des3_set3key_dec( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 3] ) { uint32_t sk[96]; des3_set3key( sk, ctx->sk, key ); zeroize( sk, sizeof( sk ) ); return( 0 ); } /* * DES-ECB block encryption/decryption */ int des_crypt_ecb( des_context *ctx, const unsigned char input[8], unsigned char output[8] ) { int i; uint32_t X, Y, T, *SK; SK = ctx->sk; GET_UINT32_BE( X, input, 0 ); GET_UINT32_BE( Y, input, 4 ); DES_IP( X, Y ); for( i = 0; i < 8; i++ ) { DES_ROUND( Y, X ); DES_ROUND( X, Y ); } DES_FP( Y, X ); PUT_UINT32_BE( Y, output, 0 ); PUT_UINT32_BE( X, output, 4 ); return( 0 ); } /* * DES-CBC buffer encryption/decryption */ int des_crypt_cbc( des_context *ctx, int mode, size_t length, unsigned char iv[8], const unsigned char *input, unsigned char *output ) { int i; unsigned char temp[8]; if( length % 8 ) return( ERR_DES_INVALID_INPUT_LENGTH ); if( mode == DES_ENCRYPT ) { while( length > 0 ) { for( i = 0; i < 8; i++ ) output[i] = (unsigned char)( input[i] ^ iv[i] ); des_crypt_ecb( ctx, output, output ); memcpy( iv, output, 8 ); input += 8; output += 8; length -= 8; } } else /* DES_DECRYPT */ { while( length > 0 ) { memcpy( temp, input, 8 ); des_crypt_ecb( ctx, input, output ); for( i = 0; i < 8; i++ ) output[i] = (unsigned char)( output[i] ^ iv[i] ); memcpy( iv, temp, 8 ); input += 8; output += 8; length -= 8; } } return( 0 ); } /* * 3DES-ECB block encryption/decryption */ int des3_crypt_ecb( des3_context *ctx, const unsigned char input[8], unsigned char output[8] ) { int i; uint32_t X, Y, T, *SK; SK = ctx->sk; GET_UINT32_BE( X, input, 0 ); GET_UINT32_BE( Y, input, 4 ); DES_IP( X, Y ); for( i = 0; i < 8; i++ ) { DES_ROUND( Y, X ); DES_ROUND( X, Y ); } for( i = 0; i < 8; i++ ) { DES_ROUND( X, Y ); DES_ROUND( Y, X ); } for( i = 0; i < 8; i++ ) { DES_ROUND( Y, X ); DES_ROUND( X, Y ); } DES_FP( Y, X ); PUT_UINT32_BE( Y, output, 0 ); PUT_UINT32_BE( X, output, 4 ); return( 0 ); } /* * 3DES-CBC buffer encryption/decryption */ int des3_crypt_cbc( des3_context *ctx, int mode, size_t length, unsigned char iv[8], const unsigned char *input, unsigned char *output ) { int i; unsigned char temp[8]; if( length % 8 ) return( ERR_DES_INVALID_INPUT_LENGTH ); if( mode == DES_ENCRYPT ) { while( length > 0 ) { for( i = 0; i < 8; i++ ) output[i] = (unsigned char)( input[i] ^ iv[i] ); des3_crypt_ecb( ctx, output, output ); memcpy( iv, output, 8 ); input += 8; output += 8; length -= 8; } } else /* DES_DECRYPT */ { while( length > 0 ) { memcpy( temp, input, 8 ); des3_crypt_ecb( ctx, input, output ); for( i = 0; i < 8; i++ ) output[i] = (unsigned char)( output[i] ^ iv[i] ); memcpy( iv, temp, 8 ); input += 8; output += 8; length -= 8; } } return( 0 ); } #endif /* !DES_ALT */ #endif /* DES_C */ /* * DES-ECB buffer encryption API */ unsigned int des_ecb_encrypt(unsigned char *pout, unsigned char *pdata, unsigned int nlen, unsigned char *pkey) { unsigned char *tmp; unsigned int len,i; unsigned char ch = '\0'; des_context ctx; des_setkey_enc( &ctx, pkey ); len = (nlen / 8 + (nlen % 8 ? 1: 0)) * 8; //ch = 8 - nlen % 8; for(i = 0;i < nlen;i += 8) { des_crypt_ecb( &ctx, (pdata + i), (pout + i) ); } if(len > nlen) { tmp = (unsigned char *)malloc(len); i -= 8; memcpy(tmp,pdata + i,nlen - i); memset(tmp + nlen % 8, ch, (8 - nlen % 8) % 8); des_crypt_ecb( &ctx, tmp, (pout + i)); free(tmp); } des_free( &ctx ); return len; } /* * DES-ECB buffer decryption API */ unsigned int des_ecb_decrypt(unsigned char *pout, unsigned char *pdata, unsigned int nlen, unsigned char *pkey) { unsigned int i; des_context ctx; if(nlen % 8) return 1; des_setkey_dec( &ctx, pkey ); for(i = 0;i < nlen;i += 8) { des_crypt_ecb(&ctx, (pdata + i), (pout + i)); } des_free( &ctx ); return 0; } /* * DES-CBC buffer encryption API */ unsigned int des_cbc_encrypt(unsigned char *pout, unsigned char *pdata, unsigned int nlen, unsigned char *pkey, unsigned char *piv) { des_context ctx; unsigned char iv[8] = {0}; unsigned char *pivb; if(piv == NULL) pivb = iv; else pivb = piv; des_setkey_enc( &ctx, pkey ); des_crypt_cbc( &ctx, 1, nlen, pivb, pdata, (pout)); des_free( &ctx ); return nlen; } /* * DES-CBC buffer decryption API */ unsigned int des_cbc_decrypt(unsigned char *pout, unsigned char *pdata, unsigned int nlen, unsigned char *pkey, unsigned char *piv) { des_context ctx; unsigned char iv[8] = {0}; unsigned char *pivb; if(piv == NULL) pivb = iv; else pivb = piv; des_setkey_dec( &ctx, pkey ); des_crypt_cbc( &ctx, 0, nlen, pivb, pdata, (pout)); des_free( &ctx ); return 0; } /* * 3DES-ECB buffer encryption API */ unsigned int des3_ecb_encrypt(unsigned char *pout, unsigned char *pdata, unsigned int nlen, unsigned char *pkey, unsigned int klen) { unsigned char *tmp; unsigned int len,i; unsigned char ch = '\0'; des3_context ctx3; if(klen == DES3_KEY2_SIZE)//16字节 des3_set2key_enc( &ctx3, pkey );//根据长度设置key else if(klen == DES3_KEY3_SIZE)//24字节 des3_set3key_enc( &ctx3, pkey ); len = (nlen / 8 + (nlen % 8 ? 1: 0)) * 8; //ch = 8 - nlen % 8;//可以设置补齐内容，常用0或0xFF for(i = 0;i < nlen;i += 8) { des3_crypt_ecb( &ctx3, (pdata + i), (pout + i) ); } if(len > nlen)//不足8字节补齐 { tmp = (unsigned char *)malloc(len); i -= 8; memcpy(tmp,pdata + i,nlen - i); memset(tmp + nlen % 8, ch, (8 - nlen % 8) % 8); des3_crypt_ecb( &ctx3, tmp, (pout + i)); free(tmp); } des3_free( &ctx3 ); return len; } /* * 3DES-ECB buffer decryption API */ unsigned int des3_ecb_decrypt(unsigned char *pout, unsigned char *pdata, unsigned int nlen, unsigned char *pkey, unsigned int klen) { unsigned int i; des3_context ctx3; if(nlen % 8) return 1; if(klen == DES3_KEY2_SIZE) des3_set2key_dec( &ctx3, pkey ); else if(klen == DES3_KEY3_SIZE) des3_set3key_dec( &ctx3, pkey ); for(i = 0;i < nlen;i += 8) { des3_crypt_ecb(&ctx3, (pdata + i), (pout + i)); } des3_free( &ctx3 ); return 0; } /* * 3DES-CBC buffer encryption API */ unsigned int des3_cbc_encrypt(unsigned char *pout, unsigned char *pdata, unsigned int nlen, unsigned char *pkey, unsigned int klen, unsigned char *piv) { des3_context ctx; unsigned char iv[8] = {0}; unsigned char *pivb; unsigned int len; if(piv == NULL) pivb = iv; else pivb = piv; if(klen == DES3_KEY2_SIZE) des3_set2key_enc( &ctx, pkey ); else if(klen == DES3_KEY3_SIZE) des3_set3key_enc( &ctx, pkey ); if(nlen % 8) { len = nlen + 8 - nlen % 8; tmp = (unsigned char *)calloc(1, len); memcpy(tmp, pdata, nlen); des3_crypt_cbc( &ctx, 1, len, pivb, tmp, (pout)); free(tmp); } else { des3_crypt_cbc( &ctx, 1, nlen, pivb, pdata, (pout)); } des3_free( &ctx ); return nlen; } /* * 3DES-CBC buffer decryption API */ unsigned int des3_cbc_decrypt(unsigned char *pout, unsigned char *pdata, unsigned int nlen, unsigned char *pkey, unsigned int klen, unsigned char *piv) { des3_context ctx; unsigned char iv[8] = {0}; unsigned char *pivb; if(nlen % 8) return 1; if(piv == NULL) pivb = iv; else pivb = piv; if(klen == DES3_KEY2_SIZE) des3_set2key_dec( &ctx, pkey ); else if(klen == DES3_KEY3_SIZE) des3_set3key_dec( &ctx, pkey ); des3_crypt_cbc( &ctx, 0, nlen, pivb, pdata, (pout)); des3_free( &ctx ); return 0; }

这些函数接口可以直接调用，很方便，代码内容也比较清晰，结合DES的算法原理很容易理解

//main函数测试
int des_test_self()
{
    unsigned char buff[1024] = {0}; unsigned char data[1024] = {0x3F,0x12,0xE7,0xC0,0x2D,0x66,0x5A,0xB0,0xC4,0x2E,0x58,0xF1}; int ret,len,i; // len = MyStrToHex("3F12E7C02D665AB0C42E58F1", data);//不满8字节 len = strlen((char*)data); for(i = 0;i < len;i++) { printf("%02X",data[i]); } printf("\r\n"); unsigned char key[16] = {0x11,0x22,0x33,0x44,0x55,0x66,0x77,0x88,0x99,0x00,0xAA,0xBB,0xCC,0xDD,0xEE,0xFF}; //DES ECB 加密 printf("DES ECB ENC::\r\n"); ret = des_ecb_encrypt(buff,data,len,key); for(i = 0;i < ret;i++) { printf("%02X",buff[i]); } printf("\r\n"); //DES ECB 解密 printf("DES ECB DEC::\r\n"); memset(data,0,sizeof(data)); des_ecb_decrypt(data,buff,ret,key); for(i = 0;i < ret;i++) { printf("%02X",data[i]); } printf("\r\n"); //DES CBC 加密 printf("DES CBC ENC::\r\n"); memset(buff,0,sizeof(buff)); des_cbc_encrypt(buff,data,ret,key,NULL); for(i = 0;i < ret;i++) { printf("%02X",buff[i]); } printf("\r\n"); //DES CBC 解密 printf("DES CBC DEC::\r\n"); memset(data,0,sizeof(data)); des_cbc_decrypt(data,buff,ret,key,NULL); for(i = 0;i < ret;i++) { printf("%02X",data[i]); } printf("\r\n"); printf("\r\n"); //3DES ECB 加密 printf("3DES ECB ENC::\r\n"); ret = des3_ecb_encrypt(buff,data,len,key,16); for(i = 0;i < ret;i++) { printf("%02X",buff[i]); } printf("\r\n"); //3DES ECB 解密 printf("3DES ECB DEC::\r\n"); memset(data,0,sizeof(data)); des3_ecb_decrypt(data,buff,ret,key,16); for(i = 0;i < ret;i++) { printf("%02X",data[i]); } printf("\r\n"); //3DES CBC 加密 printf("3DES CBC ENC::\r\n"); memset(buff,0,sizeof(buff)); des3_cbc_encrypt(buff,data,ret,key,16,NULL); for(i = 0;i < ret;i++) { printf("%02X",buff[i]); } printf("\r\n"); //3DES CBC 解密 printf("3DES CBC DEC::\r\n"); memset(data,0,sizeof(data)); des3_cbc_decrypt(data,buff,ret,key,16,NULL); for(i = 0;i < ret;i++) { printf("%02X",data[i]); } printf("\r\n"); return 0; }

具体验证使用这个工具，内含DES和3DES的CBC算法的计算，和后边的博客中提到的其他算法的工具合集
加密解密算法工具集

--------------------- 作者：leumber 来源：CSDN 原文：https://blog.csdn.net/leumber/article/details/78043675?utm_source=copy 版权声明：本文为博主原创文章，转载请附上博文链接！