Add Rust bindings to AES_CTR through EVP_* cipher API's

Change-Id: If9b68dffc801f1d592dd0dff7d4e07fcc5eb76a7
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/60445
Reviewed-by: Bob Beck <bbe@google.com>
Commit-Queue: Bob Beck <bbe@google.com>
diff --git a/rust/bssl-crypto/src/lib.rs b/rust/bssl-crypto/src/lib.rs
index c538467..99140b7 100644
--- a/rust/bssl-crypto/src/lib.rs
+++ b/rust/bssl-crypto/src/lib.rs
@@ -32,6 +32,9 @@
 /// AES block operations.
 pub mod aes;
 
+/// Ciphers.
+pub mod cipher;
+
 /// Hash functions.
 pub mod digest;