121 lines
3.2 KiB
C++
121 lines
3.2 KiB
C++
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using namespace std;
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#include "SM4.h"
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#include "../mms/db_interface.h"
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////////////////////////////////////////////////////////////////////////////////////////////////////
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void GetSM4Code(unsigned char* pSerise,char* pKey,char* output)
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{
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int i=0;
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unsigned char szKey[16+1] = {0};
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unsigned char input[16+1] = {0};
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time_t now_secs = apr_time_sec(apr_time_now());
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#if 0
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systime_t tm;
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memset(&tm,0,sizeof(systime_t));
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tm.year = 2017;
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tm.mon = 5;
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tm.mday =29;
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tm.hour = 15;
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tm.min = 16;
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tm.sec = 20;
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now_secs = apr_time_sec(getTicksOfSystemTime(&tm));
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apr_snprintf(pSerise,sizeof(pSerise),"%s","0123456789");
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apr_snprintf(pKey,sizeof(pKey),"%s","epri.sgcc.com.cn"); //应生成加密密文 “FACCAB57B27FD9BD1627506EF751EE61”
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#endif
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int seriseLen = strlen((const char*)pSerise);
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int keyLen = strlen(pKey);
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time_t t = now_secs ;// -8*60*60; //调整时区
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unsigned char* pTime = (unsigned char*)&t;
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unsigned char* p_u_key = (unsigned char*)pKey;
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input[0] = pTime[3];
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input[1] = pTime[2];
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input[2] = pTime[1];
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input[3] = pTime[0];
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for (i = 0; i < 12; i++) {
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if(i<seriseLen)
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input[4+i] = pSerise[i];
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else
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input[4+i] = 0;
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}
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for (i = 0; i < 16; i++) {
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if(i<keyLen)
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szKey[i] = p_u_key[i];
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else
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szKey[i] = 0;
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}
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SM4 sm4Encode;
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sm4Encode.sm4_enc((char*)input,seriseLen+4,(char*)output,szKey);
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printf("now_secs:%lld ||series: %s ||ptime: %x %x %x %x\n", now_secs, output, pTime[3], pTime[2], pTime[1], pTime[0]);//lnk20250304
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}
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void MyGetSM4Code(char* input,unsigned char* szKey,char* output)
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{
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SM4 sm4Encode;
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sm4Encode.sm4_enc(input,strlen(input),output,szKey);
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}
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//////////////////////////////////////////////////////////////////////////////////////////////////lnk20250728
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/**
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* SM4 ECB 解密函数（ZeroPadding）
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* @param encrypted_base64_str 加密后的 Base64 字符串
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* @param key_str 16字节密钥（明文）
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* @param decrypted_output 解密后输出的字符串，需由调用者预先分配内存
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* @return 0 成功，非 0 失败
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*/
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// 注意：这里使用 ZeroPadding，因此需要去除末尾 0
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int sm4_ecb_decrypt_zeropad_base64(const char* base64_cipher, const char* key_str, char* plaintext_out) {
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if (!base64_cipher || !key_str || !plaintext_out) {
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return -1;
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}
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// base64 decode
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unsigned char cipher_bin[256] = {0};
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long cipher_len = 0; // 输出长度
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int ret = base64_decode(base64_cipher, strlen(base64_cipher),
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(char*)cipher_bin, &cipher_len);
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if (ret != 0) {
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// 解码失败处理
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return -1;
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}
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if (cipher_len <= 0 || cipher_len % 16 != 0) {
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return -2; // SM4 块长度必须为 16 的倍数
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}
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// 准备 key
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if (strlen(key_str) != 16) {
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return -3; // SM4 要求密钥是 16 字节
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}
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unsigned char key_bin[16] = {0};
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memcpy(key_bin, key_str, 16);
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// 初始化 SM4 解密上下文
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sm4_context ctx;
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SM4 sm4;
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sm4.sm4_setkey_dec(&ctx, key_bin);
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// 解密
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unsigned char plain_buf[256] = {0};
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sm4.sm4_crypt_ecb(&ctx, SM4_DECRYPT, cipher_len, cipher_bin, plain_buf);
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// 去除 zero padding（末尾的 0x00）
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int plain_len = cipher_len;
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while (plain_len > 0 && plain_buf[plain_len - 1] == 0x00) {
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plain_len--;
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}
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memcpy(plaintext_out, plain_buf, plain_len);
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plaintext_out[plain_len] = '\0';
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return 0;
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}
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