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概述
(AES)RIJNDAEL算法是一个数据块长度盒密钥长度都可变的分组加密算法,其数据块长度和密钥长度都可独立地选定为大于等于128位且小于等于256位的32位任意倍数。深入学习请参考《密码学》书籍,谢谢各位参阅。
验证环境:STM32F401CEU6,已通过。
1、code
aes.h
- //
- // Created by asus on 2023/7/7.
- //
-
- #ifndef TEST_C_PROJECT_AES_H
- #define TEST_C_PROJECT_AES_H
-
- #define Nb 4 //加解密数据块大小,固定为4
-
- //加密类型对应的密匙长度,单位bit
- typedef enum {
- AES128 = 128,
- AES192 = 192,
- AES256 = 256,
- } AESType_t;
-
- //加解密模式
- typedef enum {
- AES_MODE_ECB = 0, // 电子密码本模式
- AES_MODE_CBC = 1, // 密码分组链接模式
- } AESMode_t;
-
- typedef struct {
- int Nk; //用户不需要填充,密钥长度,单位字节, AES128:Nk=16、AES192:Nk=24、AES256:Nr=32
- int Nr; //用户不需要填充,加密的轮数 AES128:Nr=10、AES192:Nr=12、AES256:Nr=14
- int type;//用户需填充,关联AESType_t
- int mode;//用户需填充,关联AESMode_t
- const void* key;//用户需填充,密匙
- const void* pIV;//用户需填充,初始化向量, 当mode=AES_MODE_CBC时需要设置,指向unsigned char IV[4*Nb];
- //AES拓展密匙, 空间大小 AES128:4*Nb*(10+1):4*Nb*(12+1)、AES256:4*Nb*(14+1)
- unsigned char expandKey[4 * Nb * (14 + 1)];//用户不需要填充,[4*Nb*(Nr+1)]、这里按最大的AES256进行初始化
- } AESInfo_t;
-
- /*****************************************************************************
- * 函数名: AESInit
- * 功能描述: 初始化
- * 输入参数: aesInfoP -- 用户需要填充
- * 输出参数: 无。
- * 返回值: 无。
- *****************************************************************************/
- void AESInit(AESInfo_t* aesInfoP);
-
- /*****************************************************************************
- * 函数名: AESEncrypt
- * 功能描述: 加密数据
- * 输入参数: aesInfoP -- 包含key、加密方式等初始化信息
- * pPlainText -- 要加密的数据,其长度为nDataLen字节。
- * dataLen -- 数据长度,以字节为单位,需要是整倍数,AES128:16倍数、AES192:24倍数、AES256:32倍数。
- * 输出参数: pCipherText -- 密文,即由明文加密后的数据,可以与pPlainText相同。
- * 返回值: 解密后的数据长度。。
- *****************************************************************************/
- unsigned int AESEncrypt(AESInfo_t* aesInfoP, const unsigned char* pPlainText, unsigned char* pCipherText, unsigned int nDataLen);
-
- /*****************************************************************************
- * 函数名: AESDecrypt
- * 描述: 解密数据
- * 输入参数: aesInfoP -- 包含key、加密方式等初始化信息
- * pPlainText -- 要加密的数据,其长度为nDataLen字节。
- * dataLen -- 数据长度,以字节为单位,需要是整倍数,AES128:16倍数、AES192:24倍数、AES256:32倍数。
- * 输出参数: pCipherText -- 加密后的数据,可以与pCipherText相同
- * 返回值: 返回解密后的数据长度。
- *****************************************************************************/
- unsigned int AESDecrypt(AESInfo_t* aesInfoP, unsigned char* pPlainText, const unsigned char* pCipherText, unsigned int nDataLen);
-
-
- #endif //TEST_C_PROJECT_AES_H

aes.c
- //
- // Created by asus on 2023/7/7.
- //
- #include "aes.h"
- #include <string.h>
-
- // GF(2^8) 多项式
- #define BPOLY 0x1B //x^4 + x^3 + x^1 + x^0= 从右边开始算,bit0、bit1、bit3、bit4、为1,bit2、bit5、bit6、bit7为0,即00011011=0x1B
-
- /*
- SubstituteBytes()
- 加密时:使用S盒,将待加密数据为S盒索引将加密数据替换为S盒的内容
- 解密时:使用逆S盒,将已加密数据为逆S盒索引将已加密数据替换为逆S盒子的内容
- 其实就是将数据按表替换,
- 例如待加密数据unsigned char data = 9;
- 加密数据:encryptData = SBox[data] = SBox[9] = 0x01;//注意索引从0开始
- 解密数据:decryptData = InvSBox[encryptData] = InvSBox[0x01] = 9;
- SBox和InvSBox的关系是 data = InvSBox[SBox[data]];还跟GF(2^8) 多项式有关
- */
-
- // 加密用的S盒
- static const unsigned char SBox[256] =
- {
- 0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
- 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
- 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
- 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
- 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
- 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
- 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
- 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
- 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
- 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
- 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
- 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
- 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
- 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
- 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
- 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16
- };
-
- // 解密用的SBox
- static const unsigned char InvSBox[256] =
- {
- 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
- };
-
- /*****************************************************************************
- * 函数名: RShiftWord
- * 功能描述: 对一个pWord 4字节数据进行循环右移。
- * 输入参数: pWord -- 要右移的4字节数据。
- * 输出参数: pWord -- 右移后的4字节数据。
- * 返回值: 无。
- *****************************************************************************/
- static void RShiftWord(unsigned char* pWord)
- {
- unsigned char temp = pWord[0];
- pWord[0] = pWord[1];
- pWord[1] = pWord[2];
- pWord[2] = pWord[3];
- pWord[3] = temp;
- }
-
- /*****************************************************************************
- * 函数名: XorBytes
- * 功能描述: 异或两组数据。
- * 输入参数: pData1 -- 要异或的第一组数据。
- * pData2 -- 要异或的第二组数据。
- * nCount -- 参与异或的数据长度。
- * 输出参数: pData1 -- 异或后的结果。
- * 返回值: 无。
- *****************************************************************************/
- static void XorBytes(unsigned char* pData1, const unsigned char* pData2, unsigned char nCount)
- {
- unsigned char i;
- for (i = 0; i < nCount; i++) {
- pData1[i] ^= pData2[i];
- }
- }
-
- /*****************************************************************************
- * 函数名: AddKey
- * 功能描述: 把 pData数据 加上(异或)pKey密钥,数据长度为16字节。
- * 输入参数: pData -- 数据。
- * pKey -- 密钥。
- * 输出参数: pData -- 加上子密钥后的数据。
- * 返回值: 无。
- *****************************************************************************/
- static void AddKey(unsigned char* pData, const unsigned char* pKey)
- {
- XorBytes(pData, pKey, 4 * Nb);
- }
-
- /*****************************************************************************
- * 函数名: SubstituteBytes
- * 功能描述: 通过S盒子置换数据。
- * 输入参数: pData -- 数据。
- * dataCnt -- 数据长度。
- * pBox -- 置换盒子,加密时使用SBox, 解密时使用InvSBox
- * 输出参数: pData -- 置换后的状态数据。
- * 返回值: 无。
- *****************************************************************************/
- static void SubstituteBytes(unsigned char* pData, unsigned char dataCnt, const unsigned char* pBox)
- {
- unsigned char i;
- for (i = 0; i < dataCnt; i++) {
- pData[i] = pBox[pData[i]];
- }
- }
-
- /*****************************************************************************
- * 函数名: ShiftRows
- * 功能描述: 把状态数据移行。
- * 输入参数: pState -- 状态数据。
- * bInvert -- 是否反向移行(解密时使用)。
- * 输出参数: pState -- 移行后的状态数据。
- * 返回值: 无。
- *****************************************************************************/
- static void ShiftRows(unsigned char* pState, unsigned char bInvert)
- {
- // 注意:状态数据以列形式存放!
- unsigned char r; // row, 行
- unsigned char c; // column,列
- unsigned char temp;
- unsigned char rowData[4];
-
- for (r = 1; r < 4; r++) {
- // 备份一行数据
- for (c = 0; c < 4; c++) {
- rowData[c] = pState[r + 4 * c];
- }
-
- temp = bInvert ? (4 - r) : r;
- for (c = 0; c < 4; c++) {
- pState[r + 4 * c] = rowData[(c + temp) % 4];
- }
- }
- }
-
- /*****************************************************************************
- * 函数名: GfMultBy02
- * 功能描述: 在GF(28)域的 乘2 运算。
- * 输入参数: num -- 乘数。
- * 输出参数: 无。
- * 返回值: num乘以2的结果。
- *****************************************************************************/
- static unsigned char GfMultBy02(unsigned char num)
- {
- if (0 == (num & 0x80)) {
- num = num << 1;
- }
- else {
- num = (num << 1) ^ BPOLY;
- }
-
- return num;
- }
-
- /*****************************************************************************
- * 函数名: MixColumns
- * 功能描述: 混合各列数据。
- * 输入参数: pData -- 数据。
- * bInvert -- 是否反向混合(解密时使用)。
- * 输出参数: pData -- 混合列后的状态数据。
- * 返回值: 无。
- *****************************************************************************/
- static void MixColumns(unsigned char* pData, unsigned char bInvert)
- {
- unsigned char i;
- unsigned char temp;
- unsigned char a0Pa2_M4; // 4(a0 + a2)
- unsigned char a1Pa3_M4; // 4(a1 + a3)
- unsigned char result[4];
-
- for (i = 0; i < 4; i++, pData += 4) {
- temp = pData[0] ^ pData[1] ^ pData[2] ^ pData[3];
- result[0] = temp ^ pData[0] ^ GfMultBy02((unsigned char)(pData[0] ^ pData[1]));
- result[1] = temp ^ pData[1] ^ GfMultBy02((unsigned char)(pData[1] ^ pData[2]));
- result[2] = temp ^ pData[2] ^ GfMultBy02((unsigned char)(pData[2] ^ pData[3]));
- result[3] = temp ^ pData[3] ^ GfMultBy02((unsigned char)(pData[3] ^ pData[0]));
-
- if (bInvert) {
- a0Pa2_M4 = GfMultBy02(GfMultBy02((unsigned char)(pData[0] ^ pData[2])));
- a1Pa3_M4 = GfMultBy02(GfMultBy02((unsigned char)(pData[1] ^ pData[3])));
- temp = GfMultBy02((unsigned char)(a0Pa2_M4 ^ a1Pa3_M4));
- result[0] ^= temp ^ a0Pa2_M4;
- result[1] ^= temp ^ a1Pa3_M4;
- result[2] ^= temp ^ a0Pa2_M4;
- result[3] ^= temp ^ a1Pa3_M4;
- }
-
- memcpy(pData, result, 4);
- }
- }
-
- /*****************************************************************************
- * 函数名: BlockEncrypt
- * 功能描述: 对单块数据加密。
- * 输入参数: pData -- 要加密的块数据。
- * 输出参数: pData -- 加密后的块数据。
- * 返回值: 无。
- *****************************************************************************/
- static void BlockEncrypt(AESInfo_t* aesInfoP, unsigned char* pData)
- {
- unsigned char i;
-
- AddKey(pData, aesInfoP->expandKey);
- for (i = 1; i <= aesInfoP->Nr; i++) {
- SubstituteBytes(pData, 4 * Nb, SBox);
- ShiftRows(pData, 0);
-
- if (i != aesInfoP->Nr) {
- MixColumns(pData, 0);
- }
-
- AddKey(pData, &aesInfoP->expandKey[4 * Nb * i]);
- }
- }
-
- /*****************************************************************************
- * 函数名: BlockDecrypt
- * 功能描述: 对单块数据解密。
- * 输入参数: pData -- 要解密的数据。
- * 输出参数: pData -- 解密后的数据。
- * 返回值: 无。
- *****************************************************************************/
- static void BlockDecrypt(AESInfo_t* aesInfoP, unsigned char* pData)
- {
- unsigned char i;
-
- AddKey(pData, &aesInfoP->expandKey[4 * Nb * aesInfoP->Nr]);
-
- for (i = aesInfoP->Nr; i > 0; i--) {
- ShiftRows(pData, 1);
- SubstituteBytes(pData, 4 * Nb, InvSBox);
- AddKey(pData, &aesInfoP->expandKey[4 * Nb * (i - 1)]);
-
- if (1 != i) {
- MixColumns(pData, 1);
- }
- }
- }
-
-
- /*****************************************************************************
- * 函数名: AESAddPKCS7Padding
- * 描述: PKCS7 方式填充数据
- * 输入参数: data -- 后面最多预留16个字节空间用于存放填充值
- * len -- 数据的长度
- * 输出参数: data -- 添加填充码后的数据
- * 返回值: 填充后的长度
- *****************************************************************************/
- static unsigned int AESAddPKCS7Padding(unsigned char* data, unsigned int len)
- {
- unsigned int newLen;
- newLen = len + 16 - (len % 16);
- memset(&data[len], newLen - len, newLen - len);
- return newLen;
- }
-
- /*****************************************************************************
- * 函数名: AESDelPKCS7Padding
- * 描述: PKCS7Padding 填充密文解密后剔除填充值
- * 输入参数: pData -- 解密后的数据
- * len -- 数据的长度
- * 输出参数: pData -- 删除填充码后的数据
- * 返回值: 删除后的实际有效数据长度,为0表示传入的数据异常
- *****************************************************************************/
- static unsigned int AESDelPKCS7Padding(unsigned char* pData, unsigned int len)
- {
- if (0 != (len & 0x0F)) {//1组16字节,(0 != (len & 0x0F)说明不是16的倍数
- return 0;
- }
- if (pData[len - 1] > len) {
- return 0;
- }
-
- return len - pData[len - 1];
- }
-
- /*****************************************************************************
- * 函数名: AESInit
- * 功能描述: 初始化
- * 输入参数: aesInfoP -- 用户需要填充
- * 输出参数: 无。
- * 返回值: 无。
- *****************************************************************************/
- void AESInit(AESInfo_t* aesInfoP)
- {
-
- unsigned char i;
- unsigned char* pExpandKey;//扩展密钥
- unsigned char Rcon[4] = { 0x01, 0x00, 0x00, 0x00 };
-
- switch (aesInfoP->type) {
- case AES128:
- aesInfoP->Nr = 10;
- aesInfoP->Nk = 16;
- break;
- case AES192:
- aesInfoP->Nr = 12;
- aesInfoP->Nk = 24;
- break;
- case AES256:
- aesInfoP->Nr = 14;
- aesInfoP->Nk = 32;
- break;
- default:
- aesInfoP->Nr = 10;
- aesInfoP->Nk = 16;
- break;
- }
-
- //拓展密匙
- memcpy(aesInfoP->expandKey, aesInfoP->key, 4 * aesInfoP->Nk);//第一个是原始密匙,
- pExpandKey = &aesInfoP->expandKey[4 * aesInfoP->Nk]; //拓展密匙AES128:10个、AES192:12个、AES256:14个
- for (i = aesInfoP->Nk; i < Nb * (aesInfoP->Nr + 1); pExpandKey += 4, i++) {
- memcpy(pExpandKey, pExpandKey - 4, 4);
-
- if (0 == i % aesInfoP->Nk) {
- RShiftWord(pExpandKey);
- SubstituteBytes(pExpandKey, 4, SBox);
- XorBytes(pExpandKey, Rcon, 4);
-
- Rcon[0] = GfMultBy02(Rcon[0]);
- }
- else if (6 < aesInfoP->Nk && i % aesInfoP->Nk == Nb) {
- SubstituteBytes(pExpandKey, 4, SBox);
- }
-
- XorBytes(pExpandKey, pExpandKey - 4 * aesInfoP->Nk, 4);
- }
- }
-
- /*****************************************************************************
- * 函数名: AESEncrypt
- * 功能描述: 加密数据
- * 输入参数: aesInfoP -- 包含key、加密方式等初始化信息
- * pPlainText -- 要加密的数据,其长度为nDataLen字节。
- * dataLen -- 数据长度,以字节为单位,需要是整倍数,AES128:16倍数、AES192:24倍数、AES256:32倍数。
- * 输出参数: pCipherText -- 加密后的数据,预留长度:dataLen+16
- * 返回值: 解密后的数据长度。
- *****************************************************************************/
- unsigned int AESEncrypt(AESInfo_t* aesInfoP, const unsigned char* pPlainText, unsigned char* pCipherText, unsigned int nDataLen)
- {
- unsigned int i;
- const void* pIV = NULL;
-
- if (pPlainText != pCipherText) {
- memcpy(pCipherText, pPlainText, nDataLen);
- }
-
- //必须是16的整倍数,不够的填充,pkcs7算法是缺n补n个n,比如13字节数据缺了3个,后面就补3个3;如果刚好是16的倍数,就填充16个16
- nDataLen = AESAddPKCS7Padding(pCipherText, nDataLen);
-
- if (aesInfoP->pIV) {
- pIV = aesInfoP->pIV;
- }
-
- for (i = nDataLen / (4 * Nb); i > 0; i--, pCipherText += 4 * Nb) {
- if (AES_MODE_CBC == aesInfoP->mode) {
- XorBytes(pCipherText, pIV, 4 * Nb);
- }
-
- BlockEncrypt(aesInfoP, pCipherText);
- if (aesInfoP->pIV) {
- pIV = pCipherText;
- }
- }
- return nDataLen;
- }
-
- /*****************************************************************************
- * 函数名: AESDecrypt
- * 功能描述: 解密数据
- * 输入参数: aesInfoP -- 包含key、加密方式等初始化信息
- * pPlainText -- 要加密的数据,其长度为dataLen字节。
- * dataLen -- 数据长度,以字节为单位,需要是整倍数,AES128:16倍数、AES192:24倍数、AES256:32倍数。
- * 输出参数: pCipherText -- 加密后的数据,可以与pCipherText相同
- * 返回值: 返回解密后的数据长度。
- *****************************************************************************/
- unsigned int AESDecrypt(AESInfo_t* aesInfoP, unsigned char* pPlainText, const unsigned char* pCipherText, unsigned int dataLen)
- {
- unsigned int i;
- unsigned char* pPlainTextBack = pPlainText;
-
- if (pPlainText != pCipherText) {
- memcpy(pPlainText, pCipherText, dataLen);
- }
-
- //当mode=AES_MODE_CBC时需要从最后一块数据开始解密
- pPlainText += dataLen - 4 * Nb;
- for (i = dataLen / (4 * Nb); i > 0; i--, pPlainText -= 4 * Nb) {
- BlockDecrypt(aesInfoP, pPlainText);
- if (AES_MODE_CBC == aesInfoP->mode) {
- if (1 == i) {//原来的第一块数据是初始变量加密的
- XorBytes(pPlainText, aesInfoP->pIV, 4 * Nb);
- }
- else {
- XorBytes(pPlainText, pPlainText - 4 * Nb, 4 * Nb);
- }
- }
- }
-
- //因为数据需要16字节对齐,可能有填充数据,需要去除后面的填充数据
- return AESDelPKCS7Padding(pPlainTextBack, dataLen);
- }
-
-
-

main.c
- #include "aes.h"
- #include <stdio.h>
- #include <string.h>
- #include <ctype.h> //isprint
-
- void PrintData(const char* head, unsigned char* data, unsigned int len)
- {
- unsigned int i;
-
- printf("%s, len:%u:\r\n", head, len);
-
- //按16进制打印出来
- printf("HEX:[");
- for (i = 0; i < len; i++) {
- printf("%02X ", data[i]);
- }
- printf("]\r\n");
-
- //按ASCII码打印出来
- printf("ASCII:[");
- for (i = 0; i < len; i++) {
- if (isprint(data[i])) {//可打印字符
- printf("'%c' ", data[i]);
- }
- else {
- printf("\\%02X ", data[i]);
- }
-
- }
- printf("]\r\n");
- }
-
- void test_fun(void)
- {
- unsigned int len;
- printf("Build %s %s\r\n", __DATE__, __TIME__);
-
- for (int i = 1; i <= 6; i++)
- {
- switch (i)
- {
- case 1: {
-
- //秘钥, AES128 用16字节
- unsigned char key[16] = {
- 0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,
- 0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38
- };
- //初始化向量, 固定长度8个, 当mode=AES_MODE_CBC时用到
- unsigned char IV[2 * Nb] = { 0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38 };
-
- //要加密的内容
- unsigned char sourceMsg[] = "Hello AES 128 Hello AES 128 Hello AES 128 Hello AES 128";
- //加密后的内容
- unsigned char encryptMsg[sizeof(sourceMsg) + 16] = { 0 };
- //解密后的内容
- unsigned char decryptMsg[sizeof(sourceMsg) + 16] = { 0 };
-
- //设置加密方式、密匙
- AESInfo_t aesInfo = {
- .type = AES128,
- .mode = AES_MODE_CBC,
- .key = key,
- .pIV = IV
- };
- printf("\r\n");
- printf(" AES MODE CBC .pIV = IV \r\n");
- printf("*************************** AES128 ******************************\n");
- PrintData("sourceMsg", sourceMsg, strlen((const char*)sourceMsg));
-
- //初始化
- AESInit(&aesInfo);
-
- //加密
- len = AESEncrypt(&aesInfo, sourceMsg, encryptMsg, strlen((const char*)sourceMsg));
- PrintData("encryptMsg", encryptMsg, len);
-
- //解密
- len = AESDecrypt(&aesInfo, decryptMsg, encryptMsg, len);
- PrintData("decryptMsg", decryptMsg, len);
- } break;
-
- case 2: {
- //秘钥, AES192 用24字节
- unsigned char key[24] = {
- 0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x30,0x41,0x42,
- 0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x30,0x41,0x42
- };
- //初始化向量, 固定长度12个, 当mode=AES_MODE_CBC时用到
- unsigned char IV[3 * Nb] = { 0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x30,0x41,0x42 };
-
- //要加密的内容
- unsigned char sourceMsg[] = "Hello AES 192";
- //加密后的内容
- unsigned char encryptMsg[sizeof(sourceMsg) + 16] = { 0 };
- //解密后的内容
- unsigned char decryptMsg[sizeof(sourceMsg) + 16] = { 0 };
-
- //设置加密方式、密匙
- AESInfo_t aesInfo = {
- .type = AES192,
- .mode = AES_MODE_CBC,
- .key = key,
- .pIV = IV
- };
-
- printf("*************************** AES192 ******************************\n");
- PrintData("sourceMsg", sourceMsg, strlen((const char*)sourceMsg));
-
- //初始化
- AESInit(&aesInfo);
-
- //加密
- len = AESEncrypt(&aesInfo, sourceMsg, encryptMsg, strlen((const char*)sourceMsg));
- PrintData("encryptMsg", encryptMsg, len);
-
- //解密
- len = AESDecrypt(&aesInfo, decryptMsg, encryptMsg, len);
- PrintData("decryptMsg", decryptMsg, len);
- } break;
- case 3: {
- //秘钥, AES256 用32字节
- unsigned char key[32] = {
- 0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x30,0x41,0x42,0x43,0x44,0x45,0x46,
- 0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x30,0x41,0x42,0x43,0x44,0x45,0x46
- };
- //初始化向量, 固定长度16个, 当mode=AES_MODE_CBC时用到
- unsigned char IV[4 * Nb] = { 0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x30,0x41,0x42,0x43,0x44,0x45,0x46 };
-
- //要加密的内容
- unsigned char sourceMsg[] = "Hello AES 256";
- //加密后的内容
- unsigned char encryptMsg[sizeof(sourceMsg) + 16] = { 0 };
- //解密后的内容
- unsigned char decryptMsg[sizeof(sourceMsg) + 16] = { 0 };
-
- //设置加密方式、密匙
- AESInfo_t aesInfo = {
- .type = AES256,
- .mode = AES_MODE_CBC,
- .key = key,
- .pIV = IV
- };
-
- printf("*************************** AES256 ******************************\n");
- PrintData("sourceMsg", sourceMsg, strlen((const char*)sourceMsg));
-
- //初始化
- AESInit(&aesInfo);
-
- //加密
- len = AESEncrypt(&aesInfo, sourceMsg, encryptMsg, strlen((const char*)sourceMsg));
- PrintData("encryptMsg", encryptMsg, len);
-
- //解密
- len = AESDecrypt(&aesInfo, decryptMsg, encryptMsg, len);
- PrintData("decryptMsg", decryptMsg, len);
- } break;
-
- case 4: {
- //秘钥, AES128 用16字节
- unsigned char key[16] = {
- 0x2b,0x7e,0x15,0x16,0x17,0x18,0xd2,0xa6,
- 0xab,0xf7,0x15,0x88,0x09,0xcf,0x4f,0x3c
- };
-
- //要加密的内容
- unsigned char sourceMsg[] = {
- 0x32,0x43,0xf6,0xa8,0x88,0x89,0x30,0x8d,
- 0x31,0x32,0x98,0xa2,0xe0,0x37,0x07,0x34
- };
-
- //加密后的内容
- unsigned char encryptMsg[sizeof(sourceMsg) + 16] = { 0 };
- //解密后的内容
- unsigned char decryptMsg[sizeof(sourceMsg) + 16] = { 0 };
-
- //设置加密方式、密匙
- AESInfo_t aesInfo = {
- .type = AES128,
- .mode = AES_MODE_ECB,
- .key = key,
- .pIV = NULL
- };
-
- printf("\r\n");
- printf(" AES MODE ECB .pIV = NULL \r\n");
- printf("*************************** AES128 ******************************\n");
- PrintData("sourceMsg", sourceMsg, sizeof(sourceMsg)/sizeof(unsigned char));
-
- //初始化
- AESInit(&aesInfo);
-
- //加密
- len = AESEncrypt(&aesInfo, sourceMsg, encryptMsg, sizeof(sourceMsg) / sizeof(unsigned char));
- PrintData("encryptMsg", encryptMsg, len);
-
- //解密
- len = AESDecrypt(&aesInfo, decryptMsg, encryptMsg, len);
- PrintData("decryptMsg", decryptMsg, len);
- } break;
-
- case 5: {
- //秘钥, AES192 用24字节
- unsigned char key[24] = {
- 0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x30,0x41,0x42,
- 0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x30,0x41,0x42
- };
-
- //要加密的内容
- unsigned char sourceMsg[] = {
- 0x32,0x43,0xf6,0xa8,0x88,0x89,0x30,0x8d,0x25,
- 0x31,0x32,0x98,0xa2,0xe0,0x37,0x07,0x34,0x11
- };
-
- //加密后的内容
- unsigned char encryptMsg[sizeof(sourceMsg) + 16] = { 0 };
- //解密后的内容
- unsigned char decryptMsg[sizeof(sourceMsg) + 16] = { 0 };
-
- //设置加密方式、密匙
- AESInfo_t aesInfo = {
- .type = AES192,
- .mode = AES_MODE_ECB,
- .key = key,
- .pIV = NULL
- };
-
- printf("*************************** AES192 ******************************\n");
- PrintData("sourceMsg", sourceMsg, strlen((const char*)sourceMsg));
-
- //初始化
- AESInit(&aesInfo);
-
- //加密
- len = AESEncrypt(&aesInfo, sourceMsg, encryptMsg, strlen((const char*)sourceMsg));
- PrintData("encryptMsg", encryptMsg, len);
-
- //解密
- len = AESDecrypt(&aesInfo, decryptMsg, encryptMsg, len);
- PrintData("decryptMsg", decryptMsg, len);
- } break;
- case 6: {
- //秘钥, AES256 用32字节
- unsigned char key[32] = {
- 0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x30,0x41,0x42,0x43,0x44,0x45,0x46,
- 0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x30,0x41,0x42,0x43,0x44,0x45,0x46
- };
-
- //要加密的内容
- unsigned char sourceMsg[] = {
- 0x32,0x43,0xf6,0xa8,0x88,0x89,0x30,0x8d,0x55,
- 0x31,0x32,0x98,0xa2,0xe0,0x37,0x07,0x34,0x53
- };
-
- //加密后的内容
- unsigned char encryptMsg[sizeof(sourceMsg) + 16] = { 0 };
- //解密后的内容
- unsigned char decryptMsg[sizeof(sourceMsg) + 16] = { 0 };
-
- //设置加密方式、密匙
- AESInfo_t aesInfo = {
- .type = AES256,
- .mode = AES_MODE_ECB,
- .key = key,
- .pIV = NULL
- };
-
- printf("*************************** AES256 ******************************\n");
- PrintData("sourceMsg", sourceMsg, strlen((const char*)sourceMsg));
-
- //初始化
- AESInit(&aesInfo);
-
- //加密
- len = AESEncrypt(&aesInfo, sourceMsg, encryptMsg, strlen((const char*)sourceMsg));
- PrintData("encryptMsg", encryptMsg, len);
-
- //解密
- len = AESDecrypt(&aesInfo, decryptMsg, encryptMsg, len);
- PrintData("decryptMsg", decryptMsg, len);
- } break;
-
-
- default:
- break;
- }
- }
-
- }
-
- int main(int argc, char* argv[])
- {
-
- test_fun();
-
- return 0;
- }
-
-
-

3、运行结果

4、总结
希望能帮助到需要的攻城狮。
参考文章 https://blog.csdn.net/nanfeibuyi/article/details/125474445
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