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Require Import Crypto.Spec.Encoding.
Section EncodingTheorems.
Context {A B : Type} {E : encoding of A as B}.
Lemma encoding_inj : forall x y, enc x = enc y -> x = y.
Proof.
intros.
assert (dec (enc x) = dec (enc y)) as dec_enc_eq by (f_equal; auto).
do 2 rewrite encoding_valid in dec_enc_eq.
inversion dec_enc_eq; auto.
Qed.
End EncodingTheorems.
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