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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 12:41:41 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 12:41:41 +0000 |
commit | 10ee2acdd26a7f1298c6f6d6b7af9b469fe29b87 (patch) | |
tree | bdffd5d80c26cf4a7a518281a204be1ace85b4c1 /vendor/crypto-bigint/src/uint/encoding/der.rs | |
parent | Releasing progress-linux version 1.70.0+dfsg1-9~progress7.99u1. (diff) | |
download | rustc-10ee2acdd26a7f1298c6f6d6b7af9b469fe29b87.tar.xz rustc-10ee2acdd26a7f1298c6f6d6b7af9b469fe29b87.zip |
Merging upstream version 1.70.0+dfsg2.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'vendor/crypto-bigint/src/uint/encoding/der.rs')
-rw-r--r-- | vendor/crypto-bigint/src/uint/encoding/der.rs | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/vendor/crypto-bigint/src/uint/encoding/der.rs b/vendor/crypto-bigint/src/uint/encoding/der.rs new file mode 100644 index 000000000..cf1b9c31e --- /dev/null +++ b/vendor/crypto-bigint/src/uint/encoding/der.rs @@ -0,0 +1,69 @@ +//! Support for decoding/encoding [`UInt`] as an ASN.1 DER `INTEGER`. + +use crate::{generic_array::GenericArray, ArrayEncoding, UInt}; +use ::der::{ + asn1::{AnyRef, UIntRef}, + DecodeValue, EncodeValue, FixedTag, Length, Tag, +}; + +#[cfg_attr(docsrs, doc(cfg(feature = "der")))] +impl<'a, const LIMBS: usize> TryFrom<AnyRef<'a>> for UInt<LIMBS> +where + UInt<LIMBS>: ArrayEncoding, +{ + type Error = der::Error; + + fn try_from(any: AnyRef<'a>) -> der::Result<UInt<LIMBS>> { + UIntRef::try_from(any)?.try_into() + } +} + +#[cfg_attr(docsrs, doc(cfg(feature = "der")))] +impl<'a, const LIMBS: usize> TryFrom<UIntRef<'a>> for UInt<LIMBS> +where + UInt<LIMBS>: ArrayEncoding, +{ + type Error = der::Error; + + fn try_from(bytes: UIntRef<'a>) -> der::Result<UInt<LIMBS>> { + let mut array = GenericArray::default(); + let offset = array.len().saturating_sub(bytes.len().try_into()?); + array[offset..].copy_from_slice(bytes.as_bytes()); + Ok(UInt::from_be_byte_array(array)) + } +} + +#[cfg_attr(docsrs, doc(cfg(feature = "der")))] +impl<'a, const LIMBS: usize> DecodeValue<'a> for UInt<LIMBS> +where + UInt<LIMBS>: ArrayEncoding, +{ + fn decode_value<R: der::Reader<'a>>(reader: &mut R, header: der::Header) -> der::Result<Self> { + UIntRef::decode_value(reader, header)?.try_into() + } +} + +#[cfg_attr(docsrs, doc(cfg(feature = "der")))] +impl<const LIMBS: usize> EncodeValue for UInt<LIMBS> +where + UInt<LIMBS>: ArrayEncoding, +{ + fn value_len(&self) -> der::Result<Length> { + // TODO(tarcieri): more efficient length calculation + let array = self.to_be_byte_array(); + UIntRef::new(&array)?.value_len() + } + + fn encode_value(&self, encoder: &mut dyn der::Writer) -> der::Result<()> { + let array = self.to_be_byte_array(); + UIntRef::new(&array)?.encode_value(encoder) + } +} + +#[cfg_attr(docsrs, doc(cfg(feature = "der")))] +impl<const LIMBS: usize> FixedTag for UInt<LIMBS> +where + UInt<LIMBS>: ArrayEncoding, +{ + const TAG: Tag = Tag::Integer; +} |