mirror of
https://github.com/storytold/craft-libs.git
synced 2026-11-13 18:54:45 +00:00
Dylan M. TaylorandMartin Ball
dbed0a83ea
The [MS-PST] reader of MailCraft crates/pst at a44a450, moved as it is: the node database, heap, property and table contexts, folders, messages, recipients, attachments, named properties, recurrence blobs and list streams, with its limits, salvage and tests. Left in MailCraft for now: the compressed-RTF and RTF text reading and the code-page name table, which are not part of the .pst format. Co-authored-by: Martin Ball <98639962+benandez@users.noreply.github.com>
100 lines
5.5 KiB
Rust
100 lines
5.5 KiB
Rust
//! The two keyless encodings of data blocks, [MS-PST] 5.1 (`NDB_CRYPT_PERMUTE`) and 5.2
|
|
//! (`NDB_CRYPT_CYCLIC`). They hide nothing: they keep text from being read straight off the disk.
|
|
//! The three tables are the specification's (`mpbbCrypt`, in three parts of 256); `I` undoes `R`.
|
|
|
|
/// How a file's data blocks are encoded (`bCryptMethod`).
|
|
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
|
|
pub enum Encryption {
|
|
None,
|
|
Permute,
|
|
Cyclic,
|
|
}
|
|
|
|
/// Decodes `data` in place, as it was stored in the block with id `bid`.
|
|
pub(crate) fn decode(method: Encryption, data: &mut [u8], bid: u64) {
|
|
match method {
|
|
Encryption::None => {}
|
|
Encryption::Permute => {
|
|
for b in data.iter_mut() {
|
|
*b = at(&I, *b);
|
|
}
|
|
}
|
|
Encryption::Cyclic => cyclic(data, bid as u32),
|
|
}
|
|
}
|
|
|
|
/// Encodes `data` in place (the test writer's side).
|
|
#[cfg(any(test, feature = "test-writer"))]
|
|
pub(crate) fn encode(method: Encryption, data: &mut [u8], bid: u64) {
|
|
match method {
|
|
Encryption::None => {}
|
|
Encryption::Permute => {
|
|
for b in data.iter_mut() {
|
|
*b = at(&R, *b);
|
|
}
|
|
}
|
|
Encryption::Cyclic => cyclic(data, bid as u32),
|
|
}
|
|
}
|
|
|
|
/// [MS-PST] 5.2: symmetric, keyed by the low 32 bits of the block id.
|
|
fn cyclic(data: &mut [u8], key: u32) {
|
|
let mut w = (key ^ (key >> 16)) as u16;
|
|
for b in data.iter_mut() {
|
|
let lo = w as u8;
|
|
let hi = (w >> 8) as u8;
|
|
let mut x = b.wrapping_add(lo);
|
|
x = at(&R, x);
|
|
x = x.wrapping_add(hi);
|
|
x = at(&S, x);
|
|
x = x.wrapping_sub(hi);
|
|
x = at(&I, x);
|
|
x = x.wrapping_sub(lo);
|
|
*b = x;
|
|
w = w.wrapping_add(1);
|
|
}
|
|
}
|
|
|
|
fn at(table: &[u8; 256], b: u8) -> u8 {
|
|
table.get(usize::from(b)).copied().unwrap_or(b)
|
|
}
|
|
|
|
#[cfg(test)]
|
|
pub(crate) fn tables() -> (&'static [u8; 256], &'static [u8; 256], &'static [u8; 256]) {
|
|
(&R, &S, &I)
|
|
}
|
|
|
|
const R: [u8; 256] = [
|
|
65, 54, 19, 98, 168, 33, 110, 187, 244, 22, 204, 4, 127, 100, 232, 93, 30, 242, 203, 42, 116, 197, 94, 53, 210, 149, 71, 158, 150, 45, 154, 136,
|
|
76, 125, 132, 63, 219, 172, 49, 182, 72, 95, 246, 196, 216, 57, 139, 231, 35, 59, 56, 142, 200, 193, 223, 37, 177, 32, 165, 70, 96, 78, 156, 251,
|
|
170, 211, 86, 81, 69, 124, 85, 0, 7, 201, 43, 157, 133, 155, 9, 160, 143, 173, 179, 15, 99, 171, 137, 75, 215, 167, 21, 90, 113, 102, 66, 191,
|
|
38, 74, 107, 152, 250, 234, 119, 83, 178, 112, 5, 44, 253, 89, 58, 134, 126, 206, 6, 235, 130, 120, 87, 199, 141, 67, 175, 180, 28, 212, 91, 205,
|
|
226, 233, 39, 79, 195, 8, 114, 128, 207, 176, 239, 245, 40, 109, 190, 48, 77, 52, 146, 213, 14, 60, 34, 50, 229, 228, 249, 159, 194, 209, 10,
|
|
129, 18, 225, 238, 145, 131, 118, 227, 151, 230, 97, 138, 23, 121, 164, 183, 220, 144, 122, 92, 140, 2, 166, 202, 105, 222, 80, 26, 17, 147, 185,
|
|
82, 135, 88, 252, 237, 29, 55, 73, 27, 106, 224, 41, 51, 153, 189, 108, 217, 148, 243, 64, 84, 111, 240, 198, 115, 184, 214, 62, 101, 24, 68, 31,
|
|
221, 103, 16, 241, 12, 25, 236, 174, 3, 161, 20, 123, 169, 11, 255, 248, 163, 192, 162, 1, 247, 46, 188, 36, 104, 117, 13, 254, 186, 47, 181,
|
|
208, 218, 61,
|
|
];
|
|
const S: [u8; 256] = [
|
|
20, 83, 15, 86, 179, 200, 122, 156, 235, 101, 72, 23, 22, 21, 159, 2, 204, 84, 124, 131, 0, 13, 12, 11, 162, 98, 168, 118, 219, 217, 237, 199,
|
|
197, 164, 220, 172, 133, 116, 214, 208, 167, 155, 174, 154, 150, 113, 102, 195, 99, 153, 184, 221, 115, 146, 142, 132, 125, 165, 94, 209, 93,
|
|
147, 177, 87, 81, 80, 128, 137, 82, 148, 79, 78, 10, 107, 188, 141, 127, 110, 71, 70, 65, 64, 68, 1, 17, 203, 3, 63, 247, 244, 225, 169, 143, 60,
|
|
58, 249, 251, 240, 25, 48, 130, 9, 46, 201, 157, 160, 134, 73, 238, 111, 77, 109, 196, 45, 129, 52, 37, 135, 27, 136, 170, 252, 6, 161, 18, 56,
|
|
253, 76, 66, 114, 100, 19, 55, 36, 106, 117, 119, 67, 255, 230, 180, 75, 54, 92, 228, 216, 53, 61, 69, 185, 44, 236, 183, 49, 43, 41, 7, 104,
|
|
163, 14, 105, 123, 24, 158, 33, 57, 190, 40, 26, 91, 120, 245, 35, 202, 42, 176, 175, 62, 254, 4, 140, 231, 229, 152, 50, 149, 211, 246, 74, 232,
|
|
166, 234, 233, 243, 213, 47, 112, 32, 242, 31, 5, 103, 173, 85, 16, 206, 205, 227, 39, 59, 218, 186, 215, 194, 38, 212, 145, 29, 210, 28, 34, 51,
|
|
248, 250, 241, 90, 239, 207, 144, 182, 139, 181, 189, 192, 191, 8, 151, 30, 108, 226, 97, 224, 198, 193, 89, 171, 187, 88, 222, 95, 223, 96, 121,
|
|
126, 178, 138,
|
|
];
|
|
const I: [u8; 256] = [
|
|
71, 241, 180, 230, 11, 106, 114, 72, 133, 78, 158, 235, 226, 248, 148, 83, 224, 187, 160, 2, 232, 90, 9, 171, 219, 227, 186, 198, 124, 195, 16,
|
|
221, 57, 5, 150, 48, 245, 55, 96, 130, 140, 201, 19, 74, 107, 29, 243, 251, 143, 38, 151, 202, 145, 23, 1, 196, 50, 45, 110, 49, 149, 255, 217,
|
|
35, 209, 0, 94, 121, 220, 68, 59, 26, 40, 197, 97, 87, 32, 144, 61, 131, 185, 67, 190, 103, 210, 70, 66, 118, 192, 109, 91, 126, 178, 15, 22, 41,
|
|
60, 169, 3, 84, 13, 218, 93, 223, 246, 183, 199, 98, 205, 141, 6, 211, 105, 92, 134, 214, 20, 247, 165, 102, 117, 172, 177, 233, 69, 33, 112, 12,
|
|
135, 159, 116, 164, 34, 76, 111, 191, 31, 86, 170, 46, 179, 120, 51, 80, 176, 163, 146, 188, 207, 25, 28, 167, 99, 203, 30, 77, 62, 75, 27, 155,
|
|
79, 231, 240, 238, 173, 58, 181, 89, 4, 234, 64, 85, 37, 81, 229, 122, 137, 56, 104, 82, 123, 252, 39, 174, 215, 189, 250, 7, 244, 204, 142, 95,
|
|
239, 53, 156, 132, 43, 21, 213, 119, 52, 73, 182, 18, 10, 127, 113, 136, 253, 157, 24, 65, 125, 147, 216, 88, 44, 206, 254, 36, 175, 222, 184,
|
|
54, 200, 161, 128, 166, 153, 152, 168, 47, 14, 129, 101, 115, 228, 194, 162, 138, 212, 225, 17, 208, 8, 139, 42, 242, 237, 154, 100, 63, 193,
|
|
108, 249, 236,
|
|
];
|