在您的代码中，use der::{Encoder...，Encoder不存在于der crate上。您可以将公钥从SEC1编码转换为ASN.1 DER编码：

main.rs文件：

use num_bigint::{BigUint, BigInt, Sign};
use simple_asn1::{to_der, ASN1Block};

fn main() {
    let sec1: Vec<u8> = vec![
        3, 89, 191, 147, 51, 6, 188, 19, 231, 106, 80, 5, 56, 106, 114, 19, 115, 17, 94, 22, 217,
        162, 205, 241, 154, 223, 129, 72, 143, 27, 102, 251,
    ];
    let x = &sec1[..32];
    let y = &sec1[32..];
    let x_val = BigUint::from_bytes_be(x);
    let y_val = BigUint::from_bytes_be(y);
    let x_bigint = BigInt::from_biguint(Sign::Plus, x_val);
    let y_bigint = BigInt::from_biguint(Sign::Plus, y_val);
    let der = to_der(&ASN1Block::Sequence(
        0,
        vec![
            ASN1Block::Integer(0, x_bigint),
            ASN1Block::Integer(0, y_bigint),
        ],
    ))
        .unwrap();
    println!("{:?}", der);
}

其输出为：

Finished dev [unoptimized + debuginfo] target(s) in 7.25s
     Running `target/debug/soTesting2`
[48, 37, 2, 32, 3, 89, 191, 147, 51, 6, 188, 19, 231, 106, 80, 5, 56, 106, 114, 19, 115, 17, 94, 22, 217, 162, 205, 241, 154, 223, 129, 72, 143, 27, 102, 251, 2, 1, 0]

Cargo.toml文件：

[package]
name = "soTesting2"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
num-bigint = "0.4"
simple_asn1 = "0.5"

发布的示例密钥是一个压缩的公钥，将以X.509/SPKI格式导出为ASN.1/DER编码的公钥。
导入可以使用k256::PublicKey::from_sec1_bytes()（如前所述），导出可以使用k256::pkcs8::EncodePublicKey::to_public_key_der()。
请注意，没有必要指定曲线（或OID），因为crate k256对于曲线secp 256 k1是 * 显式 * 的。
示例实现：

use k256;

fn main() {
    let public_key_compressed:Vec<u8> = vec![3, 89, 191, 147, 51, 6, 188, 19, 231, 106, 80, 5, 56, 106, 114, 19, 115, 17, 94, 22, 217, 162, 205, 241, 154, 223, 129, 72, 143, 27, 102, 251, 246];    
    let public_key = k256::PublicKey::from_sec1_bytes(&public_key_compressed).expect("import error");
    let public_key_der = k256::pkcs8::EncodePublicKey::to_public_key_der(&public_key).expect("export error");
    println!("{:?}", public_key_der.to_vec()); // [48, 86, 48, 16, 6, 7, 42, 134, 72, 206, 61, 2, 1, 6, 5, 43, 129, 4, 0, 10, 3, 66, 0, 4, 89, 191, 147, 51, 6, 188, 19, 231, 106, 80, 5, 56, 106, 114, 19, 115, 17, 94, 22, 217, 162, 205, 241, 154, 223, 129, 72, 143, 27, 102, 251, 246, 250, 38, 107, 239, 240, 74, 233, 61, 164, 22, 115, 130, 240, 115, 219, 245, 176, 223, 219, 226, 248, 174, 2, 113, 126, 158, 15, 175, 50, 83, 25, 191]
}