Struct block_padding::NoPadding

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pub struct NoPadding;
Expand description

Don’t pad the data. Useful for key wrapping.

use block_padding::{NoPadding, Padding};
use generic_array::{GenericArray, typenum::U8};

let msg = b"test";
let pos = msg.len();
let mut block: GenericArray::<u8, U8> = [0xff; 8].into();
block[..pos].copy_from_slice(msg);
NoPadding::pad(&mut block, pos);
assert_eq!(&block[..], b"test\xff\xff\xff\xff");
let res = NoPadding::unpad(&block).unwrap();
assert_eq!(res, b"test\xff\xff\xff\xff");

Note that even though the passed length of the message is equal to 4, the size of unpadded message is equal to the block size of 8 bytes. Also padded message contains “garbage” bytes stored in the block buffer. Thus NoPadding generally should not be used with data length of which is not multiple of block size.

Trait Implementations§

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impl Clone for NoPadding

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fn clone(&self) -> NoPadding

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for NoPadding

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl RawPadding for NoPadding

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const TYPE: PadType = PadType::NoPadding

Padding type
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fn raw_pad(block: &mut [u8], pos: usize)

Pads block filled with data up to pos (i.e length of a message stored in the block is equal to pos). Read more
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fn raw_unpad(block: &[u8]) -> Result<&[u8], UnpadError>

Unpad data in the block. Read more
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impl Copy for NoPadding

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, B> Padding<B> for T
where B: ArrayLength<u8>, T: RawPadding,

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const TYPE: PadType = const TYPE: PadType = T::TYPE;

Padding type
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fn pad(block: &mut GenericArray<u8, B>, pos: usize)

Pads block filled with data up to pos (i.e length of a message stored in the block is equal to pos). Read more
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fn unpad(block: &GenericArray<u8, B>) -> Result<&[u8], UnpadError>

Unpad data in the block. Read more
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fn unpad_blocks(blocks: &[Block<BlockSize>]) -> Result<&[u8], UnpadError>

Unpad data in the blocks. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.