什么软件可以看dat格式的文件格式 openssl几个加密算法使用介绍(3)

将der格式的证书转成pem格式

openssl x509 -inform PEM -outform DER -in server.der -out server.pem

//读取公钥license生成RSA结构

handle = fopen(RSA_PUBLIC_KEY_FILE, "r");

if (!handle) {

printf("open file %s error\n", RSA_PUBLIC_KEY_FILE);

return -1;

}

public_key = PEM_read_RSA_PUBKEY(handle, NULL, NULL, NULL);

if (handle) {

fclose(handle);

}

if (!public_key) {

printf("PEM_read_RSA_PUBKEY Error\n");

return -1;

}

printf("Loading PEM_read_RSA_PUBKEY Success\n");

//用公钥进行解密

memset(dec_buf, 0, sizeof(dec_buf));

ret = RSA_public_decrypt(dataSize, converData, dec_buf, public_key, RSA_PKCS1_PADDING);

if (ret <= 0) {

printf("RSA_public_decrypt Error(%d)\n", ret);

printf("dec_buf:%s\n", dec_buf);

}

else {

printf("RSA_public_decrypt Success\n");

printf("dec_buf:%s\n", dec_buf);

save_file(dec_buf);

}

if (converData) {

free(converData);

}

if (data) {

free(data);

}

if (public_key) {

RSA_free(public_key);

}

static int base64_decode(char *str, int str_len, unsigned char *decode)

{

int len=0;

BIO *b64 = NULL,*bmem = NULL;

b64=BIO_new(BIO_f_base64());

bmem=BIO_new_mem_buf(str, str_len);

bmem=BIO_push(b64, bmem);

len=BIO_read(bmem, decode, str_len);

decode[len]=0;

BIO_free_all(bmem);

return len;

}

int main()

{

//密钥

DES_cblock key = {'s', 't', 'a', 'r', '-', 'n', 'e', 't'};

//初始化向量,必须与加密使用的向量一致

DES_cblock ivec = { 1, 2, 3, 4, 5, 6, 7, 8 };

DES_key_schedule key_schedule;

//base64每行结束符必须是\n

char *data = "qbXat7531Oy/3ZFKNU/b4X0r/nwcnDNgT3iliJGDJr0=\n";

unsigned char base64_de[1024];

int base64_de_len = 0;

unsigned char des_de[1024];

//先base64解码

memset(base64_de, 0, sizeof(base64_de));

base64_de_len = base64_decode(data, strlen(data), base64_de);

//设置密钥

DES_set_key_unchecked(&key, &key_schedule);

//解密

memset(des_de, 0, sizeof(des_de));

DES_ncbc_encrypt(base64_de, des_de, base64_de_len, &key_schedule, &ivec, DES_DECRYPT);

printf("des_de:%s\n", des_de);

本文来自电脑杂谈，转载请注明本文网址：
http://www.pc-fly.com/a/shumachanpin/article-72318-3.html