Add a return value to signer_t.allocate_signature()

src/libstrongswan/crypto/signers/mac_signer.c

@@ -56,7 +56,7 @@ METHOD(signer_t, get_signature, void,
 	}
 }
 
-METHOD(signer_t, allocate_signature, void,
+METHOD(signer_t, allocate_signature, bool,
 	private_signer_t *this, chunk_t data, chunk_t *chunk)
 {
 	if (chunk == NULL)
@@ -72,6 +72,7 @@ METHOD(signer_t, allocate_signature, void,
 		*chunk = chunk_alloc(this->truncation);
 		memcpy(chunk->ptr, mac, this->truncation);
 	}
+	return TRUE;
 }
 
 METHOD(signer_t, verify_signature, bool,

src/libstrongswan/crypto/signers/signer.h

@@ -102,8 +102,10 @@ struct signer_t {
 	 *
 	 * @param data		a chunk containing the data to sign
 	 * @param chunk		chunk which will hold the allocated signature
+	 * @return			TRUE if signature allocated successfully
 	 */
-	void (*allocate_signature) (signer_t *this, chunk_t data, chunk_t *chunk);
+	__attribute__((warn_unused_result))
+	bool (*allocate_signature) (signer_t *this, chunk_t data, chunk_t *chunk);
 
 	/**
 	 * Verify a signature.