37 lines
704 B
Rust
37 lines
704 B
Rust
use std::libc::c_int;
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use std::vec;
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mod libcrypto {
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use std::libc::c_int;
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#[link_args = "-lcrypto"]
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extern {
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pub fn RAND_bytes(buf: *mut u8, num: c_int) -> c_int;
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}
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}
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pub fn rand_bytes(len: uint) -> ~[u8] {
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#[fixed_stack_segment]; #[inline(never)];
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let mut out = vec::with_capacity(len);
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do out.as_mut_buf |out_buf, len| {
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let r = unsafe { libcrypto::RAND_bytes(out_buf, len as c_int) };
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if r != 1 as c_int { fail!() }
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}
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unsafe { vec::raw::set_len(&mut out, len); }
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out
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_rand_bytes() {
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let bytes = rand_bytes(32u);
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println!("{:?}", bytes);
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}
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}
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