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use std::cell::RefCell;
use std::rc::Rc;
use crate::shared::*;
use aes::BlockEncrypt;
use aes::NewBlockCipher;
use block_modes::BlockMode;
use ctr::cipher::NewCipher;
use ctr::cipher::StreamCipher;
use ctr::flavors::Ctr128BE;
use ctr::flavors::Ctr32BE;
use ctr::flavors::Ctr64BE;
use ctr::flavors::CtrFlavor;
use ctr::Ctr;
use deno_core::error::custom_error;
use deno_core::error::type_error;
use deno_core::error::AnyError;
use deno_core::OpState;
use deno_core::ZeroCopyBuf;
use rsa::pkcs1::FromRsaPrivateKey;
use rsa::PaddingScheme;
use serde::Deserialize;
use sha1::Digest;
use sha1::Sha1;
use sha2::Sha256;
use sha2::Sha384;
use sha2::Sha512;
#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct DecryptOptions {
key: RawKeyData,
#[serde(flatten)]
algorithm: DecryptAlgorithm,
}
#[derive(Deserialize)]
#[serde(rename_all = "camelCase", tag = "algorithm")]
pub enum DecryptAlgorithm {
#[serde(rename = "RSA-OAEP")]
RsaOaep {
hash: ShaHash,
#[serde(with = "serde_bytes")]
label: Vec<u8>,
},
#[serde(rename = "AES-CBC", rename_all = "camelCase")]
AesCbc {
#[serde(with = "serde_bytes")]
iv: Vec<u8>,
length: usize,
},
#[serde(rename = "AES-CTR", rename_all = "camelCase")]
AesCtr {
#[serde(with = "serde_bytes")]
counter: Vec<u8>,
ctr_length: usize,
key_length: usize,
},
}
pub async fn op_crypto_decrypt(
_state: Rc<RefCell<OpState>>,
opts: DecryptOptions,
data: ZeroCopyBuf,
) -> Result<ZeroCopyBuf, AnyError> {
let key = opts.key;
let fun = move || match opts.algorithm {
DecryptAlgorithm::RsaOaep { hash, label } => {
decrypt_rsa_oaep(key, hash, label, &data)
}
DecryptAlgorithm::AesCbc { iv, length } => {
decrypt_aes_cbc(key, length, iv, &data)
}
DecryptAlgorithm::AesCtr {
counter,
ctr_length,
key_length,
} => decrypt_aes_ctr(key, key_length, &counter, ctr_length, &data),
};
let buf = tokio::task::spawn_blocking(fun).await.unwrap()?;
Ok(buf.into())
}
fn decrypt_rsa_oaep(
key: RawKeyData,
hash: ShaHash,
label: Vec<u8>,
data: &[u8],
) -> Result<Vec<u8>, deno_core::anyhow::Error> {
let key = key.as_rsa_private_key()?;
let private_key = rsa::RsaPrivateKey::from_pkcs1_der(key)?;
let label = Some(String::from_utf8_lossy(&label).to_string());
let padding = match hash {
ShaHash::Sha1 => PaddingScheme::OAEP {
digest: Box::new(Sha1::new()),
mgf_digest: Box::new(Sha1::new()),
label,
},
ShaHash::Sha256 => PaddingScheme::OAEP {
digest: Box::new(Sha256::new()),
mgf_digest: Box::new(Sha256::new()),
label,
},
ShaHash::Sha384 => PaddingScheme::OAEP {
digest: Box::new(Sha384::new()),
mgf_digest: Box::new(Sha384::new()),
label,
},
ShaHash::Sha512 => PaddingScheme::OAEP {
digest: Box::new(Sha512::new()),
mgf_digest: Box::new(Sha512::new()),
label,
},
};
private_key
.decrypt(padding, data)
.map_err(|e| custom_error("DOMExceptionOperationError", e.to_string()))
}
fn decrypt_aes_cbc(
key: RawKeyData,
length: usize,
iv: Vec<u8>,
data: &[u8],
) -> Result<Vec<u8>, deno_core::anyhow::Error> {
let key = key.as_secret_key()?;
// 2.
let plaintext = match length {
128 => {
// Section 10.3 Step 2 of RFC 2315 https://www.rfc-editor.org/rfc/rfc2315
type Aes128Cbc =
block_modes::Cbc<aes::Aes128, block_modes::block_padding::Pkcs7>;
let cipher = Aes128Cbc::new_from_slices(key, &iv)?;
cipher.decrypt_vec(data).map_err(|_| {
custom_error(
"DOMExceptionOperationError",
"Decryption failed".to_string(),
)
})?
}
192 => {
// Section 10.3 Step 2 of RFC 2315 https://www.rfc-editor.org/rfc/rfc2315
type Aes192Cbc =
block_modes::Cbc<aes::Aes192, block_modes::block_padding::Pkcs7>;
let cipher = Aes192Cbc::new_from_slices(key, &iv)?;
cipher.decrypt_vec(data).map_err(|_| {
custom_error(
"DOMExceptionOperationError",
"Decryption failed".to_string(),
)
})?
}
256 => {
// Section 10.3 Step 2 of RFC 2315 https://www.rfc-editor.org/rfc/rfc2315
type Aes256Cbc =
block_modes::Cbc<aes::Aes256, block_modes::block_padding::Pkcs7>;
let cipher = Aes256Cbc::new_from_slices(key, &iv)?;
cipher.decrypt_vec(data).map_err(|_| {
custom_error(
"DOMExceptionOperationError",
"Decryption failed".to_string(),
)
})?
}
_ => unreachable!(),
};
// 6.
Ok(plaintext)
}
fn decrypt_aes_ctr_gen<B, F>(
key: &[u8],
counter: &[u8],
data: &[u8],
) -> Result<Vec<u8>, AnyError>
where
B: BlockEncrypt + NewBlockCipher,
F: CtrFlavor<B::BlockSize>,
{
let mut cipher = Ctr::<B, F>::new(key.into(), counter.into());
let mut plaintext = data.to_vec();
cipher
.try_apply_keystream(&mut plaintext)
.map_err(|_| operation_error("tried to decrypt too much data"))?;
Ok(plaintext)
}
fn decrypt_aes_ctr(
key: RawKeyData,
key_length: usize,
counter: &[u8],
ctr_length: usize,
data: &[u8],
) -> Result<Vec<u8>, deno_core::anyhow::Error> {
let key = key.as_secret_key()?;
match ctr_length {
32 => match key_length {
128 => decrypt_aes_ctr_gen::<aes::Aes128, Ctr32BE>(key, counter, data),
192 => decrypt_aes_ctr_gen::<aes::Aes192, Ctr32BE>(key, counter, data),
256 => decrypt_aes_ctr_gen::<aes::Aes256, Ctr32BE>(key, counter, data),
_ => Err(type_error("invalid length")),
},
64 => match key_length {
128 => decrypt_aes_ctr_gen::<aes::Aes128, Ctr64BE>(key, counter, data),
192 => decrypt_aes_ctr_gen::<aes::Aes192, Ctr64BE>(key, counter, data),
256 => decrypt_aes_ctr_gen::<aes::Aes256, Ctr64BE>(key, counter, data),
_ => Err(type_error("invalid length")),
},
128 => match key_length {
128 => decrypt_aes_ctr_gen::<aes::Aes128, Ctr128BE>(key, counter, data),
192 => decrypt_aes_ctr_gen::<aes::Aes192, Ctr128BE>(key, counter, data),
256 => decrypt_aes_ctr_gen::<aes::Aes256, Ctr128BE>(key, counter, data),
_ => Err(type_error("invalid length")),
},
_ => Err(type_error(
"invalid counter length. Currently supported 32/64/128 bits",
)),
}
}
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