Merging upstream version 1.72.1+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 26 insertions, 3 deletions

diff --git a/vendor/ecdsa/src/der.rs b/vendor/ecdsa/src/der.rs
index cb774232e..b4b03c172 100644
--- a/vendor/ecdsa/src/der.rs
+++ b/vendor/ecdsa/src/der.rs
@@ -1,4 +1,7 @@
-//! Support for ECDSA signatures encoded as ASN.1 DER.
+//! Support for ASN.1 DER-encoded ECDSA signatures as specified in
+//! [RFC5912 Appendix A].
+//!
+//! [RFC5912 Appendix A]: https://www.rfc-editor.org/rfc/rfc5912#appendix-A
 
 use crate::{Error, Result};
 use core::{
@@ -16,6 +19,7 @@ use elliptic_curve::{
 use {
     alloc::{boxed::Box, vec::Vec},
     signature::SignatureEncoding,
+    spki::{der::asn1::BitString, SignatureBitStringEncoding},
 };
 
 #[cfg(feature = "serde")]
@@ -43,9 +47,16 @@ pub type MaxSize<C> = <<FieldBytesSize<C> as Add>::Output as Add<MaxOverhead>>::
 /// Byte array containing a serialized ASN.1 signature
 type SignatureBytes<C> = GenericArray<u8, MaxSize<C>>;
 
-/// ASN.1 DER-encoded signature.
+/// ASN.1 DER-encoded signature as specified in [RFC5912 Appendix A]:
 ///
-/// Generic over the scalar size of the elliptic curve.
+/// ```text
+/// ECDSA-Sig-Value ::= SEQUENCE {
+///   r  INTEGER,
+///   s  INTEGER
+/// }
+/// ```
+///
+/// [RFC5912 Appendix A]: https://www.rfc-editor.org/rfc/rfc5912#appendix-A
 pub struct Signature<C>
 where
     C: PrimeCurve,
@@ -299,6 +310,18 @@ where
     }
 }
 
+#[cfg(feature = "alloc")]
+impl<C> SignatureBitStringEncoding for Signature<C>
+where
+    C: PrimeCurve,
+    MaxSize<C>: ArrayLength<u8>,
+    <FieldBytesSize<C> as Add>::Output: Add<MaxOverhead> + ArrayLength<u8>,
+{
+    fn to_bitstring(&self) -> der::Result<BitString> {
+        BitString::new(0, self.to_vec())
+    }
+}
+
 #[cfg(feature = "serde")]
 impl<C> Serialize for Signature<C>
 where