openssl库中的加密工具可以对数据进行简单的加解密，代码如下所示：
1 #include <stdio.h> 2 #include <string.h> 3 #include <unistd.h> 4 5 #include <openssl/pem.h> 6 #include <openssl/bio.h> 7 #include <openssl/evp.h> 8 9 int base64_encode(char *in_str, int in_len, char *out_str) 10 { 11 BIO *b64, *bio; 12 BUF_MEM *bptr = NULL; 13 size_t size = 0; 14 15 if (in_str == NULL || out_str == NULL) 16 return -1; 17 18 b64 = BIO_new(BIO_f_base64()); 19 bio = BIO_new(BIO_s_mem()); 20 bio = BIO_push(b64, bio); 21 22 BIO_write(bio, in_str, in_len); 23 BIO_flush(bio); 24 25 BIO_get_mem_ptr(bio, &bptr); 26 memcpy(out_str, bptr->data, bptr->length); 27 out_str[bptr->length] = ' '; 28 size = bptr->length; 29 30 BIO_free_all(bio); 31 return size; 32 } 33 34 int base64_decode(char *in_str, int in_len, char *out_str) 35 { 36 BIO *b64, *bio; 37 BUF_MEM *bptr = NULL; 38 int counts; 39 int size = 0; 40 41 if (in_str == NULL || out_str == NULL) 42 return -1; 43 44 b64 = BIO_new(BIO_f_base64()); 45 BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL); 46 47 bio = BIO_new_mem_buf(in_str, in_len); 48 bio = BIO_push(b64, bio); 49 50 size = BIO_read(bio, out_str, in_len); 51 out_str[size] = ' '; 52 53 BIO_free_all(bio); 54 return size; 55 }
验证方式：
echo “str” | openssl base64
使用linux下的openssl命令行进行验证。