Compare two secrets
Returns 1 if equal, 0 otherwise. Only safe for equal-length inputs — check len first.
func eqSecret(a, b []byte) bool {
return subtle.ConstantTimeCompare(a, b) == 1
}crypto/subtle
Constant-time operations. Use these when a timing leak would compromise secrets.
ConstantTimeCompare
Also available: ConstantTimeSelect, ConstantTimeByteEq, XORBytes