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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
use deno_core::op2;
use deno_core::unsync::spawn_blocking;
use deno_core::ToJsBuffer;
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;
use crate::shared::*;
#[derive(Debug, thiserror::Error)]
pub enum GenerateKeyError {
#[error(transparent)]
General(#[from] SharedError),
#[error("Bad public exponent")]
BadPublicExponent,
#[error("Invalid HMAC key length")]
InvalidHMACKeyLength,
#[error("Failed to serialize RSA key")]
FailedRSAKeySerialization,
#[error("Invalid AES key length")]
InvalidAESKeyLength,
#[error("Failed to generate RSA key")]
FailedRSAKeyGeneration,
#[error("Failed to generate EC key")]
FailedECKeyGeneration,
#[error("Failed to generate key")]
FailedKeyGeneration,
}
// 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>,
},
}
#[op2(async)]
#[serde]
pub async fn op_crypto_generate_key(
#[serde] opts: GenerateKeyOptions,
) -> Result<ToJsBuffer, GenerateKeyError> {
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 = spawn_blocking(fun).await.unwrap()?;
Ok(buf.into())
}
fn generate_key_rsa(
modulus_length: u32,
public_exponent: &[u8],
) -> Result<Vec<u8>, GenerateKeyError> {
let exponent = BigUint::from_bytes_be(public_exponent);
if exponent != *PUB_EXPONENT_1 && exponent != *PUB_EXPONENT_2 {
return Err(GenerateKeyError::BadPublicExponent);
}
let mut rng = OsRng;
let private_key =
RsaPrivateKey::new_with_exp(&mut rng, modulus_length as usize, &exponent)
.map_err(|_| GenerateKeyError::FailedRSAKeyGeneration)?;
let private_key = private_key
.to_pkcs1_der()
.map_err(|_| GenerateKeyError::FailedRSAKeySerialization)?;
Ok(private_key.as_bytes().to_vec())
}
fn generate_key_ec_p521() -> Vec<u8> {
let mut rng = OsRng;
let key = p521::SecretKey::random(&mut rng);
key.to_nonzero_scalar().to_bytes().to_vec()
}
fn generate_key_ec(
named_curve: EcNamedCurve,
) -> Result<Vec<u8>, GenerateKeyError> {
let curve = match named_curve {
EcNamedCurve::P256 => &ring::signature::ECDSA_P256_SHA256_FIXED_SIGNING,
EcNamedCurve::P384 => &ring::signature::ECDSA_P384_SHA384_FIXED_SIGNING,
EcNamedCurve::P521 => return Ok(generate_key_ec_p521()),
};
let rng = ring::rand::SystemRandom::new();
let pkcs8 = EcdsaKeyPair::generate_pkcs8(curve, &rng)
.map_err(|_| GenerateKeyError::FailedECKeyGeneration)?;
Ok(pkcs8.as_ref().to_vec())
}
fn generate_key_aes(length: usize) -> Result<Vec<u8>, GenerateKeyError> {
if length % 8 != 0 || length > 256 {
return Err(GenerateKeyError::InvalidAESKeyLength);
}
let mut key = vec![0u8; length / 8];
let rng = ring::rand::SystemRandom::new();
rng
.fill(&mut key)
.map_err(|_| GenerateKeyError::FailedKeyGeneration)?;
Ok(key)
}
fn generate_key_hmac(
hash: ShaHash,
length: Option<usize>,
) -> Result<Vec<u8>, GenerateKeyError> {
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(GenerateKeyError::InvalidHMACKeyLength);
}
let length = length / 8;
if length > ring::digest::MAX_BLOCK_LEN {
return Err(GenerateKeyError::InvalidHMACKeyLength);
}
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(|_| GenerateKeyError::FailedKeyGeneration)?;
Ok(key)
}
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