buffer_sha1(buffer, offset, size);
| 参数 | 描述 |
|---|---|
| buffer | The index of the buffer to use. |
| 偏移 | The data offset value. |
| 大小 | The size of the buffer. |
返回： String（字符串）
In cryptography, SHA-1 is a cryptographic hash function designed
by the United States National Security Agency and is employed in
several widely used applications and protocols like the popular
Git where it is used to check for file changes. This
function will take input data from a buffer and returns a 160 bit
message digest in ASCII format. In this way you can generate a
secure key which can be stored and used to check the integrity of
the information being sent to (or received from) an external server
(for example). When applying this to buffers using this function
you must specify the buffer id of the buffer to use, then an offset
value (in bytes) for where to begin, and then a size (again in
bytes) for the region to be hashed.
check_string = buffer_sha1(buff, 0, buffer_get_size(buff));
The above code will create a sha1 hash for the full data stored in the buffer indexed by the variable "buff", and store the returned hash in the variable "check_string".