chore(masking): add peek_mut to PeekInterface (#7281)

crates/masking/src/abs.rs

@@ -6,6 +6,9 @@ use crate::Secret;
 pub trait PeekInterface<S> {
     /// Only method providing access to the secret value.
     fn peek(&self) -> &S;
+
+    /// Provide a mutable reference to the inner value.
+    fn peek_mut(&mut self) -> &mut S;
 }
 
 /// Interface that consumes a option secret and returns the value.

crates/masking/src/bytes.rs

@@ -28,6 +28,10 @@ impl PeekInterface<BytesMut> for SecretBytesMut {
     fn peek(&self) -> &BytesMut {
         &self.0
     }
+
+    fn peek_mut(&mut self) -> &mut BytesMut {
+        &mut self.0
+    }
 }
 
 impl fmt::Debug for SecretBytesMut {

crates/masking/src/secret.rs

@@ -95,6 +95,10 @@ where
     fn peek(&self) -> &SecretValue {
         &self.inner_secret
     }
+
+    fn peek_mut(&mut self) -> &mut SecretValue {
+        &mut self.inner_secret
+    }
 }
 
 impl<SecretValue, MaskingStrategy> From<SecretValue> for Secret<SecretValue, MaskingStrategy>

crates/masking/src/strong_secret.rs

@@ -32,6 +32,10 @@ impl<Secret: ZeroizableSecret, MaskingStrategy> PeekInterface<Secret>
     fn peek(&self) -> &Secret {
         &self.inner_secret
     }
+
+    fn peek_mut(&mut self) -> &mut Secret {
+        &mut self.inner_secret
+    }
 }
 
 impl<Secret: ZeroizableSecret, MaskingStrategy> From<Secret>