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Fix/clean up limitation of data length.

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This commit is contained in:
Heiko Schaefer 2022-02-08 19:00:18 +01:00
parent 40f279684e
commit 8a899afb9d
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GPG key ID: 4A849A1904CCBD7D
1 changed files with 6 additions and 3 deletions
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9
openpgp-card/src/apdu/command.rs
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@ -35,9 +35,11 @@ impl Command {
/// `data` must be smaller than 64 kbyte. If a larger `data` is passed,
/// this fn will panic.
pub fn new(cla: u8, ins: u8, p1: u8, p2: u8, data: Vec<u8>) -> Self {
// This constructor is the only place it gets set, so it's
// This constructor is the only place `data` gets set, so it's
// sufficient to check it here.
assert!(data.len() < 0x10000, "'data' too big, must be <64 kbyte");
if data.len() > u16::MAX as usize {
panic!("'data' too big, must be <64 kbyte");
}
Command {
cla,
@ -77,6 +79,7 @@ impl Command {
// thus disable Le in this case.
// "number of bytes in the command data field"
assert!(self.data.len() <= u16::MAX as usize);
let nc = self.data.len() as u16;
let mut buf = vec![self.cla, self.ins, self.p1, self.p2];
@ -102,7 +105,7 @@ impl Command {
} else if !ext_len {
vec![len as u8]
} else {
vec![0, (len as u16 >> 8) as u8, (len as u16 & 255) as u8]
vec![0, (len >> 8) as u8, (len & 255) as u8]
}
}