mirror of
https://github.com/denoland/deno.git
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352 lines
9.3 KiB
Rust
352 lines
9.3 KiB
Rust
use crate::shared::*;
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use aes::BlockEncrypt;
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use aes::NewBlockCipher;
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use aes_gcm::aead::generic_array::typenum::U12;
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use aes_gcm::aead::generic_array::typenum::U16;
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use aes_gcm::aead::generic_array::ArrayLength;
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use aes_gcm::aes::Aes128;
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use aes_gcm::aes::Aes192;
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use aes_gcm::aes::Aes256;
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use aes_gcm::AeadInPlace;
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use aes_gcm::NewAead;
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use aes_gcm::Nonce;
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use block_modes::BlockMode;
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use ctr::cipher::NewCipher;
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use ctr::cipher::StreamCipher;
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use ctr::flavors::Ctr128BE;
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use ctr::flavors::Ctr32BE;
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use ctr::flavors::Ctr64BE;
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use ctr::flavors::CtrFlavor;
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use ctr::Ctr;
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use deno_core::error::custom_error;
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use deno_core::error::type_error;
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use deno_core::error::AnyError;
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use deno_core::op;
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use deno_core::ZeroCopyBuf;
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use rsa::pkcs1::FromRsaPrivateKey;
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use rsa::PaddingScheme;
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use serde::Deserialize;
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use sha1::Digest;
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use sha1::Sha1;
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use sha2::Sha256;
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use sha2::Sha384;
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use sha2::Sha512;
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#[derive(Deserialize)]
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#[serde(rename_all = "camelCase")]
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pub struct DecryptOptions {
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key: RawKeyData,
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#[serde(flatten)]
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algorithm: DecryptAlgorithm,
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}
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#[derive(Deserialize)]
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#[serde(rename_all = "camelCase", tag = "algorithm")]
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pub enum DecryptAlgorithm {
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#[serde(rename = "RSA-OAEP")]
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RsaOaep {
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hash: ShaHash,
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#[serde(with = "serde_bytes")]
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label: Vec<u8>,
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},
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#[serde(rename = "AES-CBC", rename_all = "camelCase")]
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AesCbc {
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#[serde(with = "serde_bytes")]
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iv: Vec<u8>,
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length: usize,
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},
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#[serde(rename = "AES-CTR", rename_all = "camelCase")]
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AesCtr {
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#[serde(with = "serde_bytes")]
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counter: Vec<u8>,
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ctr_length: usize,
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key_length: usize,
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},
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#[serde(rename = "AES-GCM", rename_all = "camelCase")]
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AesGcm {
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#[serde(with = "serde_bytes")]
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iv: Vec<u8>,
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#[serde(with = "serde_bytes")]
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additional_data: Option<Vec<u8>>,
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length: usize,
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tag_length: usize,
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},
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}
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#[op]
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pub async fn op_crypto_decrypt(
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opts: DecryptOptions,
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data: ZeroCopyBuf,
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) -> Result<ZeroCopyBuf, AnyError> {
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let key = opts.key;
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let fun = move || match opts.algorithm {
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DecryptAlgorithm::RsaOaep { hash, label } => {
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decrypt_rsa_oaep(key, hash, label, &data)
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}
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DecryptAlgorithm::AesCbc { iv, length } => {
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decrypt_aes_cbc(key, length, iv, &data)
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}
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DecryptAlgorithm::AesCtr {
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counter,
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ctr_length,
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key_length,
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} => decrypt_aes_ctr(key, key_length, &counter, ctr_length, &data),
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DecryptAlgorithm::AesGcm {
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iv,
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additional_data,
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length,
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tag_length,
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} => decrypt_aes_gcm(key, length, tag_length, iv, additional_data, &data),
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};
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let buf = tokio::task::spawn_blocking(fun).await.unwrap()?;
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Ok(buf.into())
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}
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fn decrypt_rsa_oaep(
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key: RawKeyData,
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hash: ShaHash,
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label: Vec<u8>,
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data: &[u8],
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) -> Result<Vec<u8>, deno_core::anyhow::Error> {
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let key = key.as_rsa_private_key()?;
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let private_key = rsa::RsaPrivateKey::from_pkcs1_der(key)?;
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let label = Some(String::from_utf8_lossy(&label).to_string());
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let padding = match hash {
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ShaHash::Sha1 => PaddingScheme::OAEP {
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digest: Box::new(Sha1::new()),
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mgf_digest: Box::new(Sha1::new()),
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label,
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},
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ShaHash::Sha256 => PaddingScheme::OAEP {
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digest: Box::new(Sha256::new()),
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mgf_digest: Box::new(Sha256::new()),
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label,
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},
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ShaHash::Sha384 => PaddingScheme::OAEP {
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digest: Box::new(Sha384::new()),
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mgf_digest: Box::new(Sha384::new()),
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label,
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},
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ShaHash::Sha512 => PaddingScheme::OAEP {
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digest: Box::new(Sha512::new()),
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mgf_digest: Box::new(Sha512::new()),
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label,
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},
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};
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private_key
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.decrypt(padding, data)
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.map_err(|e| custom_error("DOMExceptionOperationError", e.to_string()))
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}
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fn decrypt_aes_cbc(
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key: RawKeyData,
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length: usize,
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iv: Vec<u8>,
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data: &[u8],
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) -> Result<Vec<u8>, deno_core::anyhow::Error> {
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let key = key.as_secret_key()?;
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// 2.
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let plaintext = match length {
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128 => {
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// Section 10.3 Step 2 of RFC 2315 https://www.rfc-editor.org/rfc/rfc2315
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type Aes128Cbc =
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block_modes::Cbc<aes::Aes128, block_modes::block_padding::Pkcs7>;
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let cipher = Aes128Cbc::new_from_slices(key, &iv)?;
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cipher.decrypt_vec(data).map_err(|_| {
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custom_error(
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"DOMExceptionOperationError",
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"Decryption failed".to_string(),
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)
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})?
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}
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192 => {
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// Section 10.3 Step 2 of RFC 2315 https://www.rfc-editor.org/rfc/rfc2315
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type Aes192Cbc =
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block_modes::Cbc<aes::Aes192, block_modes::block_padding::Pkcs7>;
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let cipher = Aes192Cbc::new_from_slices(key, &iv)?;
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cipher.decrypt_vec(data).map_err(|_| {
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custom_error(
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"DOMExceptionOperationError",
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"Decryption failed".to_string(),
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)
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})?
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}
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256 => {
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// Section 10.3 Step 2 of RFC 2315 https://www.rfc-editor.org/rfc/rfc2315
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type Aes256Cbc =
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block_modes::Cbc<aes::Aes256, block_modes::block_padding::Pkcs7>;
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let cipher = Aes256Cbc::new_from_slices(key, &iv)?;
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cipher.decrypt_vec(data).map_err(|_| {
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custom_error(
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"DOMExceptionOperationError",
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"Decryption failed".to_string(),
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)
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})?
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}
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_ => unreachable!(),
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};
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// 6.
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Ok(plaintext)
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}
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fn decrypt_aes_ctr_gen<B, F>(
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key: &[u8],
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counter: &[u8],
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data: &[u8],
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) -> Result<Vec<u8>, AnyError>
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where
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B: BlockEncrypt + NewBlockCipher,
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F: CtrFlavor<B::BlockSize>,
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{
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let mut cipher = Ctr::<B, F>::new(key.into(), counter.into());
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let mut plaintext = data.to_vec();
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cipher
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.try_apply_keystream(&mut plaintext)
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.map_err(|_| operation_error("tried to decrypt too much data"))?;
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Ok(plaintext)
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}
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fn decrypt_aes_gcm_gen<N: ArrayLength<u8>>(
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key: &[u8],
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tag: &aes_gcm::Tag,
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nonce: &[u8],
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length: usize,
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additional_data: Vec<u8>,
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plaintext: &mut [u8],
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) -> Result<(), AnyError> {
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let nonce = Nonce::from_slice(nonce);
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match length {
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128 => {
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let cipher = aes_gcm::AesGcm::<Aes128, N>::new_from_slice(key)
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.map_err(|_| operation_error("Decryption failed"))?;
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cipher
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.decrypt_in_place_detached(
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nonce,
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additional_data.as_slice(),
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plaintext,
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tag,
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)
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.map_err(|_| operation_error("Decryption failed"))?
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}
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192 => {
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let cipher = aes_gcm::AesGcm::<Aes192, N>::new_from_slice(key)
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.map_err(|_| operation_error("Decryption failed"))?;
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cipher
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.decrypt_in_place_detached(
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nonce,
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additional_data.as_slice(),
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plaintext,
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tag,
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)
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.map_err(|_| operation_error("Decryption failed"))?
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}
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256 => {
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let cipher = aes_gcm::AesGcm::<Aes256, N>::new_from_slice(key)
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.map_err(|_| operation_error("Decryption failed"))?;
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cipher
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.decrypt_in_place_detached(
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nonce,
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additional_data.as_slice(),
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plaintext,
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tag,
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)
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.map_err(|_| operation_error("Decryption failed"))?
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}
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_ => return Err(type_error("invalid length")),
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};
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Ok(())
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}
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fn decrypt_aes_ctr(
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key: RawKeyData,
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key_length: usize,
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counter: &[u8],
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ctr_length: usize,
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data: &[u8],
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) -> Result<Vec<u8>, deno_core::anyhow::Error> {
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let key = key.as_secret_key()?;
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match ctr_length {
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32 => match key_length {
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128 => decrypt_aes_ctr_gen::<aes::Aes128, Ctr32BE>(key, counter, data),
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192 => decrypt_aes_ctr_gen::<aes::Aes192, Ctr32BE>(key, counter, data),
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256 => decrypt_aes_ctr_gen::<aes::Aes256, Ctr32BE>(key, counter, data),
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_ => Err(type_error("invalid length")),
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},
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64 => match key_length {
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128 => decrypt_aes_ctr_gen::<aes::Aes128, Ctr64BE>(key, counter, data),
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192 => decrypt_aes_ctr_gen::<aes::Aes192, Ctr64BE>(key, counter, data),
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256 => decrypt_aes_ctr_gen::<aes::Aes256, Ctr64BE>(key, counter, data),
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_ => Err(type_error("invalid length")),
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},
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128 => match key_length {
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128 => decrypt_aes_ctr_gen::<aes::Aes128, Ctr128BE>(key, counter, data),
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192 => decrypt_aes_ctr_gen::<aes::Aes192, Ctr128BE>(key, counter, data),
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256 => decrypt_aes_ctr_gen::<aes::Aes256, Ctr128BE>(key, counter, data),
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_ => Err(type_error("invalid length")),
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},
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_ => Err(type_error(
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"invalid counter length. Currently supported 32/64/128 bits",
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)),
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}
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}
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fn decrypt_aes_gcm(
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key: RawKeyData,
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length: usize,
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tag_length: usize,
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iv: Vec<u8>,
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additional_data: Option<Vec<u8>>,
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data: &[u8],
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) -> Result<Vec<u8>, AnyError> {
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let key = key.as_secret_key()?;
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let additional_data = additional_data.unwrap_or_default();
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// The `aes_gcm` crate only supports 128 bits tag length.
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//
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// Note that encryption won't fail, it instead truncates the tag
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// to the specified tag length as specified in the spec.
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if tag_length != 128 {
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return Err(type_error("tag length not equal to 128"));
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}
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let sep = data.len() - (tag_length / 8);
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let tag = &data[sep..];
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// The actual ciphertext, called plaintext because it is reused in place.
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let mut plaintext = data[..sep].to_vec();
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// Fixed 96-bit or 128-bit nonce
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match iv.len() {
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12 => decrypt_aes_gcm_gen::<U12>(
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key,
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tag.into(),
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&iv,
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length,
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additional_data,
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&mut plaintext,
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)?,
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16 => decrypt_aes_gcm_gen::<U16>(
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key,
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tag.into(),
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&iv,
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length,
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additional_data,
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&mut plaintext,
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)?,
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_ => return Err(type_error("iv length not equal to 12 or 16")),
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}
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Ok(plaintext)
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}
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