将 BIO 保存到 char*（来自 SMIME_write_CMS）
我想将 BIO 保存（管道/复制）到字符数组中。 当我知道尺寸时它可以工作，但否则就不行。
例如，我可以使用这个将 char* 的内容存储到 BIO 中，
const unsigned char* data = ...
myBio = BIO_new_mem_buf((void*)data, strlen(data));
但是当我尝试使用 SMIME_write_CMS 时，它需要 BIO （我之前创建的）作为输出，但它不起作用。
const int SIZE = 50000;
unsigned char *temp = malloc(SIZE);
memset(temp, 0, SIZE);
out = BIO_new_mem_buf((void*)temp, SIZE);
if (!out) {
NSLog(@"Couldn't create new file!");
assert(false);
}
int finished = SMIME_write_CMS(out, cms, in, flags);
if (!finished) {
NSLog(@"SMIME write CMS didn't succeed!");
assert(false);
}
printf("cms encrypted: %s\n", temp);
NSLog(@"All succeeded!");
OpenSSL 参考使用 BIO 的直接文件输出。 这可行，但我不能在 Objective-c 中使用 BIO_new_file()... :-/
out = BIO_new_file("smencr.txt", "w");
if (!out)
goto err;
/* Write out S/MIME message */
if (!SMIME_write_CMS(out, cms, in, flags))
goto err;
你们有什么建议吗？
I want to save (pipe/copy) a BIO into a char array.
When I know the size it works, but otherwise not.
For example, I can store the content of my char* into a BIO using this
const unsigned char* data = ...
myBio = BIO_new_mem_buf((void*)data, strlen(data));
But when I try to use SMIME_write_CMS which takes a BIO (what I've created before) for the output it doesn't work.
const int SIZE = 50000;
unsigned char *temp = malloc(SIZE);
memset(temp, 0, SIZE);
out = BIO_new_mem_buf((void*)temp, SIZE);
if (!out) {
NSLog(@"Couldn't create new file!");
assert(false);
}
int finished = SMIME_write_CMS(out, cms, in, flags);
if (!finished) {
NSLog(@"SMIME write CMS didn't succeed!");
assert(false);
}
printf("cms encrypted: %s\n", temp);
NSLog(@"All succeeded!");
The OpenSSL reference uses a direct file output with the BIO.
This works but I can't use BIO_new_file() in objective-c... :-/
out = BIO_new_file("smencr.txt", "w");
if (!out)
goto err;
/* Write out S/MIME message */
if (!SMIME_write_CMS(out, cms, in, flags))
goto err;
Do you guys have any suggestion?
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我建议尝试使用 SIZE-1，这样可以保证它以 NULL 终止。否则，可能只是超出了缓冲区。
让我知道这是否有帮助。
编辑：
当使用
BIO_new_mem_buf()时，它是一个只读缓冲区，因此您无法写入它。如果你想写入内存使用：I would suggest trying to use SIZE-1, that way you are guaranteed that it is NULL terminated. Otherwise, it is possible that it is just over running the buffer.
Let me know if that helps.
Edit:
When using
BIO_new_mem_buf()it is a read only buffer, so you cannot write to it. If you want to write to memory use: