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AES-GCM: DRY Iv -> Block conversion.

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This commit is contained in:
Brian Smith 2023-10-11 10:56:01 -07:00
parent e6085e717f
commit faf347a24c
2 changed files with 6 additions and 4 deletions
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8
src/aead/aes.rs
View File

@ -202,7 +202,7 @@ impl Key {
#[inline]
pub fn encrypt_iv_xor_block(&self, iv: Iv, input: Block) -> Block {
let encrypted_iv = self.encrypt_block(Block::from(iv.as_bytes_less_safe()));
let encrypted_iv = self.encrypt_block(iv.into_block_less_safe());
encrypted_iv ^ input
}
@ -355,8 +355,10 @@ impl From<Counter> for Iv {
}
impl Iv {
pub(super) fn as_bytes_less_safe(&self) -> &[u8; 16] {
self.0.as_byte_array()
/// "Less safe" because it defeats attempts to use the type system to prevent reuse of the IV.
#[inline]
pub(super) fn into_block_less_safe(self) -> Block {
Block::from(self.0.as_byte_array())
}
}

2
src/aead/aes_gcm.rs
View File

@ -251,7 +251,7 @@ fn finish(
// Finalize the tag and return it.
gcm_ctx.pre_finish(|pre_tag| {
let encrypted_iv = aes_key.encrypt_block(Block::from(tag_iv.as_bytes_less_safe()));
let encrypted_iv = aes_key.encrypt_block(tag_iv.into_block_less_safe());
let tag = pre_tag ^ encrypted_iv;
Tag(*tag.as_ref())
})