AES加密解密（C语言实现）
这几天在做学校的密码学报告，贴一下源代码。。。
测试明文:
0x32,0x43,0xf6,0xa8,0x88,0x5a,0x30,0x8d,0x31,0x31,0x98,0xa2,0xe0,0x37,0x07,0x34
测试密钥:
0x2b,0x7e,0x15,0x16,0x28,0xae,0xd2,0xa6,0xab,0xf7,0x15,0x88,0x09,0xcf,0x4f,0x3c
原创源码
#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
void AddRoundKey(unsigned char *plaintext, unsigned char * CipherKey)/*轮密钥加*/
{
for (int j = 0; j < 16; j++) plaintext[j] = plaintext[j] ^ CipherKey[j];
}
void SubBytes(unsigned char *plaintext, unsigned char *plaintextencrypt, int count)/*S盒置换*/
{
unsigned int row, column;
unsigned char Sbox[16][16] = {
/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
/*0*/{
0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76 },
/*1*/{
0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0 },
/*2*/{
0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15 },
/*3*/{
0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75 },
/*4*/{
0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84 },
/*5*/{
0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf },
/*6*/{
0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8 },
/*7*/{
0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2 },
/*8*/{
0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73 },
/*9*/{
0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb },
/*a*/{
0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79 },
/*b*/{
0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08 },
/*c*/{
0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a },
/*d*/{
0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e },
/*e*/{
0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf },
/*f*/{
0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 }
};// 填充Sbox矩阵
for (int i = 0; i < count; i++)
{
row = (plaintext[i] & 0xF0) >> 4;
column = plaintext[i] & 0x0F;
plaintextencrypt[i] = Sbox[row][column];
}
}
void SubBytesRe(unsigned char *plaintext, unsigned char *plaintextencrypt, int count)/*S盒逆置换*/
{
unsigned int row, column;
unsigned char Sbox[16][16] = {
/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
{
0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb},
{
0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb},
{
0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e},
{
0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25},
{
0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92},
{
0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84},
{
0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06},
{
0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b},
{
0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73},
{
0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e},
{
0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b},
{
0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4},
{
0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f},
{
0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef},
{
0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61},
{
0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d}
}; // 填充Sbox矩阵
for (int i = 0; i < count; i++)
{
row = (plaintext[i] & 0xF0) >> 4;
column = plaintext[i] & 0x0F;
plaintextencrypt[i] = Sbox[row][column];
}
}
void ShiftRowsRe(unsigned char *plaintextencrypt)/*行移位的逆*/
{
unsigned char temp = 0;
for (int i = 0; i < 4; i++)//第i行
{
for (int j = 0; j < 4 - i; j++)//第j次左移
{
temp = plaintextencrypt[i];
for (int k = 0; k < 4; k++)
plaintextencrypt[i + 4 * k] = plaintextencrypt[i + 4 * (k + 1)];
plaintextencrypt[i + 12] = temp;
}
}
}
void ShiftRows(unsigned char *plaintextencrypt)/*行移位*/
{
unsigned char temp = 0;
for (int i = 0; i < 4; i++)//第i行
{
for (int j = 0; j < i; j++)//第j次左移
{
temp = plaintextencrypt[i];
for (int k = 0; k < 4; k++)
plaintextencrypt[i + 4 * k] = plaintextencrypt[i + 4 * (k + 1)];
plaintextencrypt[i + 12] = temp;
}
}
}
unsigned char Mult2(unsigned char num)/*列混淆*/
{
unsigned char temp = num << 1;
if ((num >> 7) & 0x01)
temp = temp ^ 27;
return temp;
}
unsigned char Mult3(unsigned char num)
{
return Mult2(num) ^ num;
}
void MixColumns(unsigned char *plaintextencrypt, unsigned char *plaintextcrypt)
{
int i;
for (i = 0; i < 4; i++)
plaintextcrypt[4 * i] = Mult2(plaintextencrypt[4 * i]) ^ Mult3(plaintextencrypt[4 * i + 1]) ^ plaintextencrypt[4 * i + 2] ^ plaintextencrypt[4 * i + 3];
for (i = 0; i < 4; i++)
plaintextcrypt[4 * i + 1] = plaintextencrypt[4 * i] ^ Mult2(plaintextencrypt[4 * i + 1]) ^ Mult3(plaintextencrypt[4 * i + 2]) ^ plaintextencrypt[4 * i + 3];
for (i = 0; i < 4; i++)
plaintextcrypt[4 * i + 2] = plaintextencrypt[4 * i] ^ plaintextencrypt[4 * i + 1] ^ Mult2(plaintextencrypt[4 * i + 2]) ^ Mult3(plaintextencrypt[4 * i + 3]);
for (i = 0; i < 4; i++)
plaintextcrypt[4 * i + 3] = Mult3(plaintextencrypt[4 * i]) ^ plaintextencrypt[4 * i + 1] ^ plaintextencrypt[4 * i + 2] ^ Mult2(plaintextencrypt[4 * i + 3]);
}
/*逆列混淆*/
#define xtime(x) ((x<<1) ^ (((x>>7) & 1) * 0x1b))
#define Multiply(x,y) (((y & 1) * x) ^ ((y>>1 & 1) * xtime(x)) ^ ((y>>2 & 1) * xtime(xtime(x))) ^ ((y>>3 & 1) * xtime(xtime(xtime(x)))) ^ ((y>>4 & 1) * xtime(xtime(xtime(xtime(x))))))
void MixColumnsRe(unsigned char *state)
{
unsigned char a, b, c, d;
for (int i = 0; i < 4; i++)
{
a = state[4*i];
b = state[4*i+1];
c = state[4*i+2];
d = state[4*i+3];
state[4 * i] = Multiply(a, 0x0e) ^ Multiply(b, 0x0b) ^ Multiply(c, 0x0d) ^ Multiply(d, 0x09);
state[4 * i + 1] = Multiply(a, 0x09) ^ Multiply(b, 0x0e) ^ Multiply(c, 0x0b) ^ Multiply(d, 0x0d);
state[4 * i + 2] = Multiply(a, 0x0d) ^ Multiply(b, 0x09) ^ Multiply(c, 0x0e) ^ Multiply(d, 0x0b);
state[4 * i + 3] = Multiply(a, 0x0b) ^ Multiply(b, 0x0d) ^ Multiply(c, 0x09) ^ Multiply(d, 0x0e);
}
}
int CharToWord(unsigned char *character, int first)/*字节转字*/
{
return (((int)character[first] & 0x000000ff) << 24) | (((int)character[first + 1] & 0x000000ff) << 16) | (((int)character[first + 2] & 0x000000ff) << 8) | ((int)character[first + 3] & 0x000000ff);
}
void WordToChar(unsigned int word, unsigned char *character)/*字转字节*/
{
for (int i = 0; i < 4; character[i++] = (word >> (8 * (3 - i))) & 0xFF);
}
void ExtendCipherKey(unsigned int *CipherKey_word, int round)/*密钥扩展*/
{
unsigned char CipherKeyChar[4] = {
0 },CipherKeyCharEncrypt[4] = {
0 };
unsigned int Rcon[10] = {
0x01000000,0x02000000,0x04000000,0x08000000,0x10000000,0x20000000,0x40000000,0x80000000,0x1B000000,0x36000000 }; //轮常量
for (int i = 4; i < 8; i++)
{
if (!(i % 4))
{
WordToChar((CipherKey_word[i - 1] >> 24) | (CipherKey_word[i - 1] << 8), CipherKeyChar);
SubBytes(CipherKeyChar, CipherKeyCharEncrypt, 4);
CipherKey_word[i] = CipherKey_word[i - 4] ^ CharToWord(CipherKeyCharEncrypt, 0) ^ Rcon[round];
}
else
CipherKey_word[i] = CipherKey_word[i - 4] ^ CipherKey_word[i - 1];
}
}
void main()
{
printf("**************AES加解密***************\n");
int i = 0, k;
unsigned char PlainText[16] = {
0x32,0x43,0xf6,0xa8,0x88,0x5a,0x30,0x8d,0x31,0x31,0x98,0xa2,0xe0,0x37,0x07,0x34 },
CipherKey[16] = {
0x2b,0x7e,0x15,0x16,0x28,0xae,0xd2,0xa6,0xab,0xf7,0x15,0x88,0x09,0xcf,0x4f,0x3c },
CipherKey1[16] = {
0x2b,0x7e,0x15,0x16,0x28,0xae,0xd2,0xa6,0xab,0xf7,0x15,0x88,0x09,0xcf,0x4f,0x3c },
PlainText1[16] = {
0 },
PlainText2[16] = {
0 };
unsigned int CipherKey_word[44] = {
0 };
for (i = 0; i < 4; CipherKey_word[i++] = CharToWord(CipherKey, 4 * i));
printf("密钥：");
for (k = 0; k < 16; k++) printf("%2X ", CipherKey[k]);
printf("\n明文：");
for (k = 0; k < 16; k++) printf("%02X ", PlainText[k]);
printf("\n**************开始加密****************");
AddRoundKey(PlainText, CipherKey);
for (i = 0; i < 9; i++)
{
printf("\n第%d轮循环：\n", i + 1);
SubBytes(PlainText, PlainText1, 16);/*S盒置换*/
ShiftRows(PlainText1); /*行移位*/
MixColumns(PlainText1, PlainText2); /*列混淆*/
ExtendCipherKey(CipherKey_word + 4 * i, i);/*子密钥生成*/
for (k = 0; k < 4; k++) WordToChar(CipherKey_word[k + 4 * (i + 1)], CipherKey + 4 * k);
printf("此时的子密钥为： ");
for (k = 0; k < 16; k++) printf("%02X ", CipherKey[k]);
AddRoundKey(PlainText2, CipherKey);/*轮密钥加*/
for (k = 0; k < 16; k++) PlainText[k] = PlainText2[k];
printf("\n当前明文加密之后为：");
for (k = 0; k < 16; k++) printf("%02X ", PlainText2[k]);
printf("\n");
}
printf("\n最后一次循环：\n");
SubBytes(PlainText, PlainText1, 16);
ShiftRows(PlainText1);
ExtendCipherKey(CipherKey_word + 4 * i, i);
for (k = 0; k < 4;WordToChar(CipherKey_word[k + 4 * (i + 1)], CipherKey + 4 * k), k++);
printf("此时的子密钥为： ");
for (k = 0; k < 16; k++) printf("%02X ", CipherKey[k]);
AddRoundKey(PlainText1, CipherKey);
printf("\n\n最终AES加密后的密文为：");
for (i = 0; i < 16; i++) printf("%02X ", PlainText1[i]);
printf("\n\n**************开始解密***************");
AddRoundKey(PlainText1, CipherKey);
for (i = 0; i < 9; i++)
{
printf("\n第%d次循环：", i + 1);
SubBytesRe(PlainText1, PlainText, 16);/*S盒置换*/
for (k = 0; k < 4; WordToChar(CipherKey_word[k + 40 - 4 * (i + 1)], CipherKey + 4 * k),k++);/*子密钥生成*/
ShiftRowsRe(PlainText);/*行移位逆*/
AddRoundKey(PlainText, CipherKey);/*轮密钥加*/
MixColumnsRe(PlainText);/*列混淆逆运算*/
for (k = 0; k < 16;PlainText1[k] = PlainText[k],k++);
printf("\n当前密文解密之后为：");
for (k = 0; k < 16; k++)printf("%02X ", PlainText[k]);
printf("\n");
}
printf("\n最后一次循环：");
ShiftRowsRe(PlainText);/*行移位逆*/
SubBytesRe(PlainText, PlainText1, 16);/*S盒置换*/
AddRoundKey(PlainText1, CipherKey1);
printf("\n最终AES解密后的明文为：");
for (i = 0; i < 16; i++) printf("%02X ", PlainText1[i]);
printf("\n");
system("pause");
}
运行效果：
- 加密
- 解密：
