From 45903bc34b0b941ab6287270807d1fa78199451d Mon Sep 17 00:00:00 2001
From: Brian DeHamer <bdehamer@github.com>
Date: Thu, 4 Jan 2024 09:46:37 -0800
Subject: [PATCH] expose signature on SignatureContent (#922)

Signed-off-by: Brian DeHamer <bdehamer@github.com>
---
 .changeset/shaggy-hotels-cheat.md     | 5 +++++
 packages/verify/src/bundle/dsse.ts    | 2 +-
 packages/verify/src/bundle/message.ts | 2 +-
 packages/verify/src/shared.types.ts   | 1 +
 4 files changed, 8 insertions(+), 2 deletions(-)
 create mode 100644 .changeset/shaggy-hotels-cheat.md

diff --git a/.changeset/shaggy-hotels-cheat.md b/.changeset/shaggy-hotels-cheat.md
new file mode 100644
index 00000000..78fcd626
--- /dev/null
+++ b/.changeset/shaggy-hotels-cheat.md
@@ -0,0 +1,5 @@
+---
+"@sigstore/verify": patch
+---
+
+Expose public `signature` property on `SignatureContent` interface
diff --git a/packages/verify/src/bundle/dsse.ts b/packages/verify/src/bundle/dsse.ts
index 06d980ba..4592dde3 100644
--- a/packages/verify/src/bundle/dsse.ts
+++ b/packages/verify/src/bundle/dsse.ts
@@ -37,7 +37,7 @@ export class DSSESignatureContent implements SignatureContent {
     return crypto.verify(this.preAuthEncoding, key, this.signature);
   }
 
-  private get signature(): Buffer {
+  public get signature(): Buffer {
     return this.env.signatures.length > 0
       ? this.env.signatures[0].sig
       : Buffer.from('');
diff --git a/packages/verify/src/bundle/message.ts b/packages/verify/src/bundle/message.ts
index b2b49bf8..7deb61e5 100644
--- a/packages/verify/src/bundle/message.ts
+++ b/packages/verify/src/bundle/message.ts
@@ -19,7 +19,7 @@ import type { MessageSignature } from '@sigstore/bundle';
 import type { SignatureContent } from '../shared.types';
 
 export class MessageSignatureContent implements SignatureContent {
-  private readonly signature: Buffer;
+  public readonly signature: Buffer;
   private readonly messageDigest: Buffer;
   private readonly artifact: Buffer;
 
diff --git a/packages/verify/src/shared.types.ts b/packages/verify/src/shared.types.ts
index 2bb4e605..77b067d1 100644
--- a/packages/verify/src/shared.types.ts
+++ b/packages/verify/src/shared.types.ts
@@ -57,6 +57,7 @@ export type VerificationKey =
     };
 
 export type SignatureContent = {
+  signature: Buffer;
   compareSignature(signature: Buffer): boolean;
   compareDigest(digest: Buffer): boolean;
   verifySignature(key: crypto.KeyObject): boolean;