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Change fixed_time_eq to avoid undefined behavior #461

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Change fixed_time_eq to avoid undefined behavior #461

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3 changes: 2 additions & 1 deletion src/util.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -41,7 +41,7 @@ pub fn secure_memset(dst: &mut [u8], val: u8) {
/// Compare two vectors using a fixed number of operations. If the two vectors are not of equal
/// length, the function returns false immediately.
pub fn fixed_time_eq(lhs: &[u8], rhs: &[u8]) -> bool {
if lhs.len() != rhs.len() {
if lhs.len() != rhs.len() || lhs.len() == 0 {
false
} else {
let count = lhs.len() as libc::size_t;
Expand Down Expand Up @@ -76,5 +76,6 @@ mod test {
assert!(!fixed_time_eq(&a, &e));
assert!(!fixed_time_eq(&a, &f));
assert!(!fixed_time_eq(&a, &g));
assert!(!fixed_time_eq(&[], &[]));
}
}