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