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feat: basic ncm support

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鲁树人
2024-09-14 01:33:32 +01:00
parent 7b283a5a14
commit 493ed8bdb5
9 changed files with 541 additions and 0 deletions
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105
um_crypto/ncm/src/metadata.rs Normal file
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use crate::NetEaseCryptoError;
use aes::Aes128Dec;
use cipher::block_padding::Pkcs7;
use cipher::generic_array::GenericArray;
use cipher::{BlockDecrypt, KeyInit};
use itertools::Itertools;
use umc_utils::base64;
const METADATA_KEY: [u8; 0x10] = *b"#14ljk_!\\]&0U<'(";
/// Decrypt metadata
///
/// # Arguments
///
/// * `key`: Encrypted metadata
///
/// returns: Result<Vec<u8, Global>, NetEaseCryptoError>
pub fn decrypt<T>(enciphered_metadata: T) -> Result<Vec<u8>, NetEaseCryptoError>
where
T: AsRef<[u8]>,
{
let data = enciphered_metadata
.as_ref()
.iter()
.map(|&b| b ^ 0x63)
.collect_vec();
let data = match data.strip_prefix(b"163 key(Don't modify):") {
None => Err(NetEaseCryptoError::MetadataWrongPrefix(
String::from_utf8_lossy(&data[..]).to_string(),
))?,
Some(data) => data,
};
let mut data = base64::decode(data).map_err(NetEaseCryptoError::MetadataDecodeError)?;
let aes = Aes128Dec::new(&GenericArray::from(METADATA_KEY));
let metadata = aes
.decrypt_padded::<Pkcs7>(&mut data[..])
.map_err(NetEaseCryptoError::MetadataDecryptError)?;
Ok(Vec::from(metadata))
}
#[test]
fn test_decrypt_metadata() -> Result<(), NetEaseCryptoError> {
let enciphered_metadata = [
0x52, 0x55, 0x50, 0x43, 0x08, 0x06, 0x1A, 0x4B, 0x27, 0x0C, 0x0D, 0x44, 0x17, 0x43, 0x0E,
0x0C, 0x07, 0x0A, 0x05, 0x1A, 0x4A, 0x59, 0x2F, 0x55, 0x57, 0x25, 0x36, 0x50, 0x34, 0x57,
0x3A, 0x1B, 0x3B, 0x50, 0x39, 0x25, 0x37, 0x0E, 0x01, 0x39, 0x48, 0x5B, 0x4C, 0x05, 0x09,
0x07, 0x2B, 0x55, 0x22, 0x00, 0x48, 0x31, 0x32, 0x4C, 0x17, 0x07, 0x0D, 0x24, 0x1A, 0x39,
0x11, 0x26, 0x5A, 0x15, 0x29, 0x24, 0x50, 0x02, 0x07, 0x20, 0x56, 0x2D, 0x33, 0x5A, 0x0C,
0x10, 0x29, 0x26, 0x22, 0x28, 0x4C, 0x1A, 0x0D, 0x0B, 0x06, 0x28, 0x0D, 0x2C, 0x1B, 0x09,
0x2E, 0x0B, 0x2B, 0x28, 0x02, 0x13, 0x0F, 0x2F, 0x2C, 0x0E, 0x25, 0x1B, 0x4C, 0x2B, 0x52,
0x33, 0x36, 0x09, 0x37, 0x2D, 0x0B, 0x25, 0x27, 0x2C, 0x0C, 0x0D, 0x02, 0x51, 0x35, 0x5A,
0x1A, 0x35, 0x2D, 0x2F, 0x3B, 0x54, 0x2A, 0x0D, 0x4C, 0x2B, 0x16, 0x1B, 0x0C, 0x26, 0x21,
0x0B, 0x52, 0x25, 0x52, 0x36, 0x5B, 0x51, 0x50, 0x56, 0x01, 0x0A, 0x19, 0x14, 0x5B, 0x57,
0x32, 0x07, 0x06, 0x50, 0x25, 0x55, 0x54, 0x53, 0x30, 0x2C, 0x32, 0x52, 0x15, 0x00, 0x50,
0x37, 0x39, 0x28, 0x0E, 0x15, 0x0F, 0x36, 0x48, 0x11, 0x24, 0x33, 0x56, 0x07, 0x22, 0x20,
0x29, 0x14, 0x28, 0x06, 0x16, 0x01, 0x54, 0x48, 0x0B, 0x17, 0x20, 0x25, 0x36, 0x02, 0x01,
0x16, 0x07, 0x27, 0x16, 0x0C, 0x37, 0x20, 0x2A, 0x24, 0x21, 0x22, 0x50, 0x56, 0x0E, 0x34,
0x52, 0x37, 0x14, 0x29, 0x10, 0x32, 0x20, 0x36, 0x2D, 0x52, 0x21, 0x02, 0x09, 0x3B, 0x0B,
0x01, 0x17, 0x00, 0x33, 0x36, 0x0D, 0x01, 0x21, 0x2B, 0x17, 0x4C, 0x39, 0x02, 0x33, 0x51,
0x02, 0x20, 0x07, 0x37, 0x4C, 0x5A, 0x25, 0x39, 0x09, 0x51, 0x25, 0x50, 0x54, 0x4C, 0x19,
0x32, 0x37, 0x08, 0x06, 0x32, 0x55, 0x1B, 0x53, 0x0B, 0x0B, 0x4C, 0x08, 0x16, 0x33, 0x54,
0x27, 0x11, 0x02, 0x1A, 0x30, 0x28, 0x57, 0x25, 0x50, 0x3B, 0x2E, 0x28, 0x34, 0x51, 0x3B,
0x36, 0x11, 0x53, 0x12, 0x56, 0x09, 0x21, 0x2B, 0x2C, 0x14, 0x2D, 0x24, 0x5A, 0x02, 0x53,
0x16, 0x21, 0x29, 0x16, 0x02, 0x53, 0x02, 0x2A, 0x31, 0x2D, 0x31, 0x56, 0x3B, 0x17, 0x51,
0x52, 0x0F, 0x56, 0x50, 0x56, 0x00, 0x17, 0x57, 0x2F, 0x08, 0x1A, 0x52, 0x25, 0x12, 0x2D,
0x48, 0x05, 0x02, 0x37, 0x0F, 0x36, 0x30, 0x05, 0x14, 0x5A, 0x37, 0x5A, 0x50, 0x55, 0x16,
0x09, 0x53, 0x3B, 0x1B, 0x24, 0x1A, 0x1A, 0x21, 0x50, 0x06, 0x37, 0x2E, 0x57, 0x09, 0x39,
0x17, 0x13, 0x26, 0x31, 0x04, 0x52, 0x50, 0x55, 0x10, 0x53, 0x52, 0x57, 0x02, 0x04, 0x02,
0x2F, 0x01, 0x5A, 0x02, 0x2A, 0x2F, 0x19, 0x4C, 0x0C, 0x55, 0x00, 0x50, 0x2D, 0x29, 0x06,
0x16, 0x11, 0x20, 0x0D, 0x01, 0x53, 0x22, 0x32, 0x1B, 0x34, 0x00, 0x0A, 0x06, 0x02, 0x15,
0x0F, 0x25, 0x5A, 0x1A, 0x22, 0x11, 0x0E, 0x21, 0x32, 0x31, 0x22, 0x39, 0x56, 0x5A, 0x09,
0x16, 0x35, 0x16, 0x30, 0x29, 0x0F, 0x30, 0x27, 0x2C, 0x55, 0x52, 0x12, 0x48, 0x16, 0x0F,
0x0C, 0x36, 0x0C, 0x25, 0x27, 0x28, 0x35, 0x0A, 0x1A, 0x06, 0x09, 0x16, 0x39, 0x1B, 0x08,
0x10, 0x27, 0x12, 0x2C, 0x2C, 0x5B, 0x48, 0x01, 0x48, 0x33, 0x48, 0x0E, 0x1B, 0x54, 0x1B,
0x02, 0x36, 0x25, 0x20, 0x48, 0x31, 0x0B, 0x06, 0x0D, 0x15, 0x11, 0x17, 0x01, 0x24, 0x20,
0x27, 0x31, 0x30, 0x22, 0x0F, 0x22, 0x08, 0x17, 0x0F, 0x13, 0x0C, 0x0C, 0x1A, 0x12, 0x12,
0x51, 0x4C, 0x3B, 0x53, 0x3B, 0x37, 0x39, 0x16, 0x25, 0x05, 0x54, 0x10, 0x32, 0x0D, 0x48,
0x0C, 0x50, 0x5B, 0x20, 0x0B, 0x19, 0x22, 0x19, 0x0D, 0x0B, 0x28, 0x2C, 0x0B, 0x05, 0x3B,
0x51, 0x09, 0x54, 0x0A, 0x06, 0x0F, 0x57, 0x08, 0x51, 0x50, 0x24, 0x29, 0x16, 0x57, 0x33,
0x36, 0x15, 0x04, 0x50, 0x5B, 0x2F, 0x51, 0x56, 0x12, 0x09, 0x2F, 0x27, 0x30, 0x51, 0x2B,
0x37, 0x57, 0x24, 0x35, 0x5B, 0x0C, 0x0E, 0x0D, 0x0D, 0x53, 0x2A, 0x25, 0x06, 0x33, 0x22,
0x29, 0x51, 0x24, 0x08, 0x51, 0x3A, 0x06, 0x0E, 0x16, 0x31, 0x36, 0x2B, 0x10, 0x34, 0x30,
0x08, 0x0A, 0x2F, 0x19, 0x32, 0x5A, 0x04, 0x39, 0x52, 0x36, 0x1A, 0x26, 0x14, 0x0E, 0x0B,
0x2A, 0x4C, 0x39, 0x56, 0x1A, 0x01, 0x2F, 0x14, 0x33, 0x33, 0x56, 0x16, 0x25, 0x29, 0x33,
0x0E, 0x0B, 0x2D, 0x1A, 0x11, 0x29, 0x08, 0x15, 0x02, 0x2B, 0x4C, 0x01, 0x0C, 0x07, 0x0F,
0x15, 0x4C, 0x36, 0x36, 0x09, 0x4C, 0x13, 0x53, 0x11, 0x11, 0x12, 0x02, 0x0F, 0x11, 0x56,
0x2B, 0x5B, 0x21, 0x29, 0x0B, 0x51, 0x09, 0x02, 0x3B, 0x11, 0x02, 0x24, 0x16, 0x12, 0x04,
0x0A, 0x37, 0x0B, 0x22, 0x5A, 0x0B, 0x02, 0x0A, 0x02, 0x36, 0x36, 0x2A, 0x29, 0x1A, 0x14,
0x14, 0x13, 0x1B, 0x2C, 0x11, 0x31, 0x2A, 0x4C, 0x28, 0x11, 0x2B, 0x1B, 0x30, 0x51, 0x35,
0x11, 0x53, 0x0D, 0x09, 0x0F, 0x39, 0x0F, 0x25, 0x17, 0x02, 0x5B, 0x1A, 0x39, 0x26, 0x5B,
0x51, 0x3B, 0x2E, 0x04, 0x2E, 0x21, 0x36, 0x04, 0x3B, 0x11, 0x56, 0x0A, 0x2E, 0x2D, 0x1A,
0x27, 0x21, 0x10, 0x07, 0x53, 0x11, 0x37, 0x07, 0x2F, 0x51, 0x57, 0x2B, 0x24, 0x57, 0x01,
0x53, 0x35, 0x52, 0x0F, 0x2F, 0x2D, 0x48, 0x52, 0x56, 0x2B, 0x00, 0x17, 0x1A, 0x39, 0x00,
0x12, 0x09, 0x02, 0x07, 0x02, 0x52, 0x2C, 0x20, 0x4C, 0x39, 0x4C, 0x48, 0x50, 0x0D, 0x0F,
0x15, 0x4C, 0x00, 0x2B, 0x0F, 0x37, 0x48, 0x19, 0x17, 0x32, 0x35, 0x31, 0x28, 0x0B, 0x0D,
0x2D, 0x32, 0x10, 0x32, 0x56, 0x33, 0x28, 0x3B, 0x2B, 0x55, 0x12, 0x04, 0x07, 0x50, 0x24,
0x00, 0x08, 0x01, 0x10, 0x26, 0x30, 0x2C, 0x34, 0x10, 0x21, 0x0D, 0x25, 0x02, 0x2E, 0x53,
0x11, 0x2B, 0x19, 0x36, 0x31, 0x2E, 0x5A, 0x52, 0x33, 0x35, 0x20, 0x14, 0x53, 0x30, 0x04,
0x05, 0x08, 0x34, 0x13, 0x02, 0x54, 0x22, 0x05, 0x5A, 0x01, 0x20, 0x13, 0x14, 0x39, 0x2A,
0x25, 0x1B, 0x37, 0x48, 0x57, 0x53, 0x2A, 0x22, 0x3A, 0x00, 0x34, 0x53, 0x24, 0x12,
];
let key = decrypt(enciphered_metadata)?;
assert_eq!(&key[..6], b"music:");
Ok(())
}