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diff --git a/keystructs.h b/keystructs.h
index 9ec6ebf..18a9ba4 100644
--- a/keystructs.h
+++ b/keystructs.h
@@ -26,8 +26,17 @@
 
 #include "ll.h"
 
-/* v3 MD5 fingerprint is 16 characters, v4 SHA-1 fingerprint is 20 */
-#define MAX_FINGERPRINT_LEN 20
+/*
+ * Fingerprint lengths
+ *
+ * v3 MD5 fingerprint is 16 bytes
+ * v4 SHA-1 fingerprint is 20
+ * v5 SHA2-256 fingerprint is 32
+ */
+#define FINGERPRINT_V3_LEN	16
+#define FINGERPRINT_V4_LEN	20
+#define FINGERPRINT_V5_LEN	32
+#define MAX_FINGERPRINT_LEN	32
 
 /**
  * @brief Stores the fingerprint of an OpenPGP key