error[E0432]: unresolved import `once_cell::sync`
 --> /home/username/.cargo/registry/src/index.crates.io-6f17d22bba15001f/ecies-0.2.6/src/config.rs:1:16
  |
1 | use once_cell::sync::Lazy;
  |                ^^^^ could not find `sync` in `once_cell`

For more information about this error, try `rustc --explain E0432`.
error: could not compile `ecies` (lib) due to 1 previous error

use ecies::{encrypt, decrypt, utils::generate_keypair};

fn main() {
    let msg="Hello, this is a test.";
    let (sk, pk)=generate_keypair();
    let (sk, pk)=(&sk.serialize(), &pk.serialize());

    let encrypted_message=encrypt(pk, msg.as_bytes()).unwrap();

    let original=decrypt(sk, &encrypted_message).unwrap();

    let original=String::from_utf8(original).unwrap();

    println!("{original}");
    }

$ cargo build --no-default-features --features pure --target=thumbv6m-none-eabi
   Compiling subtle v2.4.1
   Compiling base64 v0.13.0
   Compiling getrandom v0.2.3
   Compiling generic-array v0.14.4
   Compiling serde v1.0.131
error[E0463]: can't find crate for `std`
  --> /.cargo/registry/src/github.com-1ecc6299db9ec823/subtle-2.4.1/src/lib.rs:88:1
   |
88 | extern crate std;
   | ^^^^^^^^^^^^^^^^^ can't find crate
   |
   = note: the `thumbv6m-none-eabi` target may not support the standard library

error[E0463]: can't find crate for `std`
 --> /.cargo/registry/src/github.com-1ecc6299db9ec823/getrandom-0.2.3/src/error_impls.rs:9:1
  |
9 | extern crate std;
  | ^^^^^^^^^^^^^^^^^ can't find crate
  |
  = note: the `thumbv6m-none-eabi` target may not support the standard library

For more information about this error, try `rustc --explain E0463`.
error: could not compile `subtle` due to previous error
warning: build failed, waiting for other jobs to finish...
error[E0463]: can't find crate for `std`
  |
  = note: the `thumbv6m-none-eabi` target may not support the standard library
  = note: `std` is required by `base64` because it does not declare `#![no_std]`

error[E0463]: can't find crate for `std`
  |
  = note: the `thumbv6m-none-eabi` target may not support the standard library
  = note: `std` is required by `serde` because it does not declare `#![no_std]`

error: build failed

  Compiling ecies v0.2.6
error[E0252]: the name `decrypt` is defined multiple times
  --> /home/kamiyaa/.cargo/registry/src/index.crates.io-6f17d22bba15001f/ecies-0.2.6/src/symmetric/mod.rs:11:16
   |
9  | use openssl_aes::{decrypt, encrypt};
   |                   ------- previous import of the value `decrypt` here
10 | #[cfg(feature = "pure")]
11 | use pure_aes::{decrypt, encrypt};
   |                ^^^^^^^ `decrypt` reimported here
   |
   = note: `decrypt` must be defined only once in the value namespace of this module
help: you can use `as` to change the binding name of the import
   |
11 | use pure_aes::{decrypt as other_decrypt, encrypt};
   |                ~~~~~~~~~~~~~~~~~~~~~~~~

error[E0252]: the name `encrypt` is defined multiple times
  --> /home/kamiyaa/.cargo/registry/src/index.crates.io-6f17d22bba15001f/ecies-0.2.6/src/symmetric/mod.rs:11:25
   |
9  | use openssl_aes::{decrypt, encrypt};
   |                            ------- previous import of the value `encrypt` here
10 | #[cfg(feature = "pure")]
11 | use pure_aes::{decrypt, encrypt};
   |                         ^^^^^^^ `encrypt` reimported here
   |
   = note: `encrypt` must be defined only once in the value namespace of this module
help: you can use `as` to change the binding name of the import
   |
11 | use pure_aes::{decrypt, encrypt as other_encrypt};
   |                         ~~~~~~~~~~~~~~~~~~~~~~~~

For more information about this error, try `rustc --explain E0252`.
error: could not compile `ecies` (lib) due to 2 previous errors