Function scratchstack_wrapper_aws_c_cal::aws_sha256_hmac_compute

pub unsafe extern "C" fn aws_sha256_hmac_compute(
    allocator: *mut aws_allocator,
    secret: *const aws_byte_cursor,
    to_hmac: *const aws_byte_cursor,
    output: *mut aws_byte_buf,
    truncate_to: usize
) -> c_int

Computes the sha256 hmac over input and writes the digest output to ‘output’. Use this if you don’t need to stream the data you’re hashing and you can load the entire input to hash into memory. If you specify truncate_to to something other than 0, the output will be truncated to that number of bytes. For example if you want a SHA256 HMAC digest as the first 16 bytes, set truncate_to to 16. If you want the full digest size, just set this to 0.