Added better error messages and context to `ESockSessionKey::from_ciphertext()`

Fortune for rsh's current commit: Small blessing − 小吉

src/sock/enc.rs

@@ -114,8 +114,7 @@ impl ESockSessionKey
 	    .wrap_err(eyre!("Failed to encrypt session key with RSA public key"))
 	    .with_section(|| self.clone().header("Session key was"))
 	    .with_section({let temp = temp.len(); move || temp.header("Encoded data size was")})
-	    .with_section(move || base64::encode(temp).header("Encoded data (base64) was"))
-	    ?;
+	    .with_section(move || base64::encode(temp).header("Encoded data (base64) was"))?;
 	debug_assert_eq!(_wr, output.len());
 
 	Ok(output)
@@ -126,8 +125,14 @@ impl ESockSessionKey
     where <K as rsa::PublicKey>::KeyType: rsa::openssl::pkey::HasPrivate //ugh, why do we have to have this bound??? it should be implied ffs... :/
     {
 	let mut temp = SmallVec::<[u8; RSA_CIPHERTEXT_SIZE]>::new();
-	rsa::decrypt_slice_sync(data, rsa_key, &mut temp)?;
-	Ok(serde_cbor::from_slice(&temp[..])?)
+	rsa::decrypt_slice_sync(data, rsa_key, &mut temp)
+	    .wrap_err(eyre!("Failed to decrypt ciphertext to session key"))
+	    .with_section({let data = data.len(); move || data.header("Ciphertext length was")})
+	    .with_section(|| base64::encode(data).header("Ciphertext was"))?;
+	Ok(serde_cbor::from_slice(&temp[..])
+	   .wrap_err(eyre!("Failed to decode CBOR data to session key object"))
+	   .with_section({let temp = temp.len(); move || temp.header("Encoded data size was")})
+	   .with_section(move || base64::encode(temp).header("Encoded data (base64) was"))?)
     }
 }