#include
#include
#include
#include
#include
#include
int main(void)
{
BIO *bc = NULL, *b = NULL;
char userkey[EVP_MAX_KEY_LENGTH];
char iv[EVP_MAX_IV_LENGTH];
unsigned char *date = malloc(AES_BLOCK_SIZE*3);
unsigned char *encrypt = malloc(AES_BLOCK_SIZE*6);
unsigned char *plain = malloc(AES_BLOCK_SIZE*6);
int ret;
int len = 0;
memset((void*)userkey, 'k', EVP_MAX_KEY_LENGTH);
memset((void*)iv, 'i', EVP_MAX_IV_LENGTH);
memset((void*)date, 'p', AES_BLOCK_SIZE*3);
memset((void*)encrypt, 0, AES_BLOCK_SIZE*6);
memset((void*)plain, 0, AES_BLOCK_SIZE*6);
bc = BIO_new(BIO_f_cipher());
BIO_set_cipher(bc,EVP_aes_256_ecb(), userkey, iv, 1);
b = BIO_new(BIO_s_null());
b = BIO_push(bc,b);
len = BIO_write(b, date, AES_BLOCK_SIZE*3);
printf("result: %d\n",BIO_get_cipher_status(b));
BIO_flush(b);
printf("write len: %d\n", len);
len = BIO_read(b, encrypt, AES_BLOCK_SIZE*6);
printf("result: %d\n",BIO_get_cipher_status(b));
printf("read len: %d\n", len);
BIO_free(b);
return 0;
}
想使用BIO的方式使用EVP_aes_256_ecb()对数据进行加密,但是结果打印如下
result: 1
write len: 48
result: 1
read len: 16
在不使用padding的情况下,加密前后数据应该相等,为什么我read的结果是16,不是48呢?
对BIO使用不熟悉,是不是BIO使用的方式不对,请各位大大帮忙解决
系统是ubuntu 12.04