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use crate::shared::*;use deno_core::error::AnyError;use deno_core::op;use deno_core::ZeroCopyBuf;use elliptic_curve::rand_core::OsRng;use num_traits::FromPrimitive;use once_cell::sync::Lazy;use ring::rand::SecureRandom;use ring::signature::EcdsaKeyPair;use rsa::pkcs1::EncodeRsaPrivateKey;use rsa::BigUint;use rsa::RsaPrivateKey;use serde::Deserialize;
// Allowlist for RSA public exponents.static PUB_EXPONENT_1: Lazy<BigUint> =  Lazy::new(|| BigUint::from_u64(3).unwrap());static PUB_EXPONENT_2: Lazy<BigUint> =  Lazy::new(|| BigUint::from_u64(65537).unwrap());
#[derive(Deserialize)]#[serde(rename_all = "camelCase", tag = "algorithm")]pub enum GenerateKeyOptions {  #[serde(rename = "RSA", rename_all = "camelCase")]  Rsa {    modulus_length: u32,    #[serde(with = "serde_bytes")]    public_exponent: Vec<u8>,  },  #[serde(rename = "EC", rename_all = "camelCase")]  Ec { named_curve: EcNamedCurve },  #[serde(rename = "AES", rename_all = "camelCase")]  Aes { length: usize },  #[serde(rename = "HMAC", rename_all = "camelCase")]  Hmac {    hash: ShaHash,    length: Option<usize>,  },}
#[op]pub async fn op_crypto_generate_key(  opts: GenerateKeyOptions,) -> Result<ZeroCopyBuf, AnyError> {  let fun = || match opts {    GenerateKeyOptions::Rsa {      modulus_length,      public_exponent,    } => generate_key_rsa(modulus_length, &public_exponent),    GenerateKeyOptions::Ec { named_curve } => generate_key_ec(named_curve),    GenerateKeyOptions::Aes { length } => generate_key_aes(length),    GenerateKeyOptions::Hmac { hash, length } => {      generate_key_hmac(hash, length)    }  };  let buf = tokio::task::spawn_blocking(fun).await.unwrap()?;  Ok(buf.into())}
fn generate_key_rsa(  modulus_length: u32,  public_exponent: &[u8],) -> Result<Vec<u8>, AnyError> {  let exponent = BigUint::from_bytes_be(public_exponent);  if exponent != *PUB_EXPONENT_1 && exponent != *PUB_EXPONENT_2 {    return Err(operation_error("Bad public exponent"));  }
  let mut rng = OsRng;
  let private_key =    RsaPrivateKey::new_with_exp(&mut rng, modulus_length as usize, &exponent)      .map_err(|_| operation_error("Failed to generate RSA key"))?;
  let private_key = private_key    .to_pkcs1_der()    .map_err(|_| operation_error("Failed to serialize RSA key"))?;
  Ok(private_key.as_bytes().to_vec())}
fn generate_key_ec(named_curve: EcNamedCurve) -> Result<Vec<u8>, AnyError> {  let curve = match named_curve {    EcNamedCurve::P256 => &ring::signature::ECDSA_P256_SHA256_FIXED_SIGNING,    EcNamedCurve::P384 => &ring::signature::ECDSA_P384_SHA384_FIXED_SIGNING,    _ => return Err(not_supported_error("Unsupported named curve")),  };
  let rng = ring::rand::SystemRandom::new();
  let pkcs8 = EcdsaKeyPair::generate_pkcs8(curve, &rng)    .map_err(|_| operation_error("Failed to generate EC key"))?;
  Ok(pkcs8.as_ref().to_vec())}
fn generate_key_aes(length: usize) -> Result<Vec<u8>, AnyError> {  if length % 8 != 0 || length > 256 {    return Err(operation_error("Invalid AES key length"));  }
  let mut key = vec![0u8; length / 8];  let rng = ring::rand::SystemRandom::new();  rng    .fill(&mut key)    .map_err(|_| operation_error("Failed to generate key"))?;
  Ok(key)}
fn generate_key_hmac(  hash: ShaHash,  length: Option<usize>,) -> Result<Vec<u8>, AnyError> {  let hash = match hash {    ShaHash::Sha1 => &ring::hmac::HMAC_SHA1_FOR_LEGACY_USE_ONLY,    ShaHash::Sha256 => &ring::hmac::HMAC_SHA256,    ShaHash::Sha384 => &ring::hmac::HMAC_SHA384,    ShaHash::Sha512 => &ring::hmac::HMAC_SHA512,  };
  let length = if let Some(length) = length {    if length % 8 != 0 {      return Err(operation_error("Invalid HMAC key length"));    }
    let length = length / 8;    if length > ring::digest::MAX_BLOCK_LEN {      return Err(operation_error("Invalid HMAC key length"));    }
    length  } else {    hash.digest_algorithm().block_len  };
  let rng = ring::rand::SystemRandom::new();  let mut key = vec![0u8; length];  rng    .fill(&mut key)    .map_err(|_| operation_error("Failed to generate key"))?;
  Ok(key)}