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
之前代码缺少一个头文件，有失严谨，这次更新一下，去掉头文件，将头文件部分内容加入到c文件头部
#include <stddef.h>#include <stdint.h>#include <string.h>#include <stdlib.h>#include <stdio.h>#define DES_ENCRYPT1#define DES_DECRYPT0#define ERR_DES_INVALID_INPUT_LENGTH -0x0032 /**< The data input has an invalid length. */#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;/*** \briefTriple-DES context structure*/typedef struct{uint32_t sk[96]; /*!< 3DES subkeys*/}des3_context;#define DES_C#if defined(DES_C)#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, 0x0800, 0x00000000, 0x08020008,0x08000200, 0x00000000, 0x0008, 0x08000200,0x00020008, 0x08000008, 0x08000008, 0x00020000,0x0808, 0x00020008, 0x08020000, 0x00000208,0x08000000, 0x00000008, 0x0800, 0x00000200,0x0000, 0x08020000, 0x08020008, 0x0008,0x08000208, 0x0000, 0x00020000, 0x08000208,0x00000008, 0x0808, 0x00000200, 0x08000000,0x0800, 0x08000000, 0x00020008, 0x00000208,0x00020000, 0x0800, 0x08000200, 0x00000000,0x00000200, 0x00020008, 0x0808, 0x08000200,0x08000008, 0x00000200, 0x00000000, 0x08020008,0x08000208, 0x00020000, 0x08000000, 0x0808,0x00000008, 0x0008, 0x0000, 0x08000008,0x08020000, 0x08000208, 0x00000208, 0x08020000,0x0008, 0x00000008, 0x08020008, 0x0000};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, 0x0002, 0x0400,0x0402, 0x00200000, 0x00000000, 0x04000002,0x00000002, 0x04000000, 0x04200002, 0x00000802,0x04000800, 0x0002, 0x00200002, 0x04000800,0x04000002, 0x04200000, 0x0400, 0x00200002,0x04200000, 0x00000800, 0x00000802, 0x0402,0x0000, 0x00000002, 0x04000000, 0x0000,0x04000000, 0x0000, 0x00200000, 0x04000802,0x04000802, 0x04200002, 0x04200002, 0x00000002,0x00200002, 0x04000000, 0x04000800, 0x00200000,0x0400, 0x00000802, 0x0002, 0x0400,0x00000802, 0x04000002, 0x0402, 0x04200000,0x0000, 0x00000000, 0x00000002, 0x0402,0x00000000, 0x0002, 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: /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 16static 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;elsepivb = 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;elsepivb = 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keyelse 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0xFFfor(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 char *tmp;unsigned int len;if(piv == NULL)pivb = iv;elsepivb = 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;elsepivb = 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
