57 lines
2.2 KiB
Rust
57 lines
2.2 KiB
Rust
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use crate::NetEaseCryptoError;
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use aes::cipher::generic_array::GenericArray;
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use aes::cipher::KeyInit;
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use aes::Aes128Dec;
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use cipher::block_padding::Pkcs7;
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use cipher::BlockDecryptMut;
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use itertools::Itertools;
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const CONTENT_KEY: [u8; 0x10] = *b"hzHRAmso5kInbaxW";
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/// Decrypt content key
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///
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/// # Arguments
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///
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/// * `key`: Encrypted content_key
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///
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/// returns: Result<Vec<u8, Global>, NetEaseCryptoError>
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///
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pub fn decrypt<T>(key: T) -> Result<Vec<u8>, NetEaseCryptoError>
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where
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T: AsRef<[u8]>,
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{
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let mut data = key.as_ref().iter().map(|&b| b ^ 0x64).collect_vec();
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let aes = Aes128Dec::new(&GenericArray::from(CONTENT_KEY));
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let content_key = aes
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.decrypt_padded_mut::<Pkcs7>(&mut data[..])
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.map_err(NetEaseCryptoError::ContentKeyDecryptError)?;
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let key = match content_key.strip_prefix(b"neteasecloudmusic") {
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None => Err(NetEaseCryptoError::ContentKeyWrongPrefix(
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String::from_utf8_lossy(content_key).into(),
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))?,
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Some(key) => key,
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};
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Ok(Vec::from(key))
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}
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#[test]
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fn test_decrypt_content_key() {
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let enciphered_key = [
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0x2C, 0xCE, 0xD5, 0xEB, 0x69, 0xEA, 0xFB, 0x14, 0x55, 0x0D, 0x45, 0xBF, 0x61, 0xDD, 0x17,
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0x1D, 0x93, 0x71, 0x47, 0x1E, 0xE1, 0xDD, 0xDA, 0xF4, 0xD5, 0xE8, 0x4F, 0x1C, 0xBA, 0x00,
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0x20, 0xC3, 0x02, 0xE9, 0xFE, 0x29, 0x92, 0xE1, 0x81, 0x45, 0x6F, 0x18, 0xC7, 0x2D, 0x11,
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0xF2, 0xBC, 0x5B, 0xBC, 0xDC, 0x22, 0x33, 0xF9, 0x68, 0xB4, 0xB0, 0x28, 0x38, 0x3F, 0x63,
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0x6C, 0x88, 0x66, 0x35, 0xF9, 0xE7, 0xB1, 0x70, 0x0E, 0xEE, 0x55, 0xAC, 0xB8, 0xED, 0x8B,
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0x48, 0x17, 0x25, 0x3A, 0xE6, 0x5E, 0xB5, 0x80, 0x78, 0x8A, 0xCD, 0xDC, 0xE1, 0xEF, 0x3D,
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0x30, 0xEC, 0x9C, 0x2A, 0xC6, 0xC7, 0x51, 0xAE, 0x3D, 0x11, 0xB5, 0x64, 0x88, 0x9E, 0xD6,
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0x77, 0x66, 0xF6, 0x2B, 0x52, 0x9E, 0xFA, 0xF9, 0x63, 0xF6, 0xDE, 0x27, 0x10, 0x45, 0x82,
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0xAC, 0x2D, 0x20, 0x84, 0x95, 0x4C, 0x0F, 0x7A, 0xAE, 0x8B, 0x91, 0x6D, 0x10, 0x2E, 0x63,
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0x1C, 0xEA, 0xCA, 0xF9, 0x14, 0x97, 0xD8, 0xB3, 0xE8,
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];
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let key = decrypt(enciphered_key).expect("Failed to decrypt content");
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assert_eq!(key, b"174279197715752960061821572626E7fT49x7dof9OKCgg9cdvhEuezy3iZCL1nFvBFd1T4uSktAJKmwZXsijPbijliionVUXXg9plTbXEclAE9Lb");
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}
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