diff --git a/src/libstore/nar-info.cc b/src/libstore/nar-info.cc
index 9028370a..680facdc 100644
--- a/src/libstore/nar-info.cc
+++ b/src/libstore/nar-info.cc
@@ -1,4 +1,3 @@
-#include "crypto.hh"
 #include "globals.hh"
 #include "nar-info.hh"
 
@@ -104,15 +103,6 @@ std::string NarInfo::to_string() const
     return res;
 }
 
-std::string NarInfo::fingerprint() const
-{
-    return
-        "1;" + path + ";"
-        + printHashType(narHash.type) + ":" + printHash32(narHash) + ";"
-        + std::to_string(narSize) + ";"
-        + concatStringsSep(",", references);
-}
-
 Strings NarInfo::shortRefs() const
 {
     Strings refs;
@@ -121,18 +111,4 @@ Strings NarInfo::shortRefs() const
     return refs;
 }
 
-void NarInfo::sign(const SecretKey & secretKey)
-{
-    sigs.insert(secretKey.signDetached(fingerprint()));
-}
-
-unsigned int NarInfo::checkSignatures(const PublicKeys & publicKeys) const
-{
-    unsigned int good = 0;
-    for (auto & sig : sigs)
-        if (verifyDetached(fingerprint(), sig, publicKeys))
-            good++;
-    return good;
-}
-
 }
diff --git a/src/libstore/nar-info.hh b/src/libstore/nar-info.hh
index 2d04e452..3c783cf8 100644
--- a/src/libstore/nar-info.hh
+++ b/src/libstore/nar-info.hh
@@ -20,20 +20,6 @@ struct NarInfo : ValidPathInfo
 
     std::string to_string() const;
 
-    /*  Return a fingerprint of the store path to be used in binary
-        cache signatures. It contains the store path, the base-32
-        SHA-256 hash of the NAR serialisation of the path, the size of
-        the NAR, and the sorted references. The size field is strictly
-        speaking superfluous, but might prevent endless/excessive data
-        attacks. */
-    std::string fingerprint() const;
-
-    void sign(const SecretKey & secretKey);
-
-    /* Return the number of signatures on this .narinfo that were
-       produced by one of the specified keys. */
-    unsigned int checkSignatures(const PublicKeys & publicKeys) const;
-
 private:
 
     Strings shortRefs() const;
diff --git a/src/libstore/store-api.cc b/src/libstore/store-api.cc
index 5f3f621e..b47376e5 100644
--- a/src/libstore/store-api.cc
+++ b/src/libstore/store-api.cc
@@ -1,5 +1,6 @@
-#include "store-api.hh"
+#include "crypto.hh"
 #include "globals.hh"
+#include "store-api.hh"
 #include "util.hh"
 
 
@@ -309,6 +310,32 @@ void Store::exportPaths(const Paths & paths,
 }
 
 
+std::string ValidPathInfo::fingerprint() const
+{
+    return
+        "1;" + path + ";"
+        + printHashType(narHash.type) + ":" + printHash32(narHash) + ";"
+        + std::to_string(narSize) + ";"
+        + concatStringsSep(",", references);
+}
+
+
+void ValidPathInfo::sign(const SecretKey & secretKey)
+{
+    sigs.insert(secretKey.signDetached(fingerprint()));
+}
+
+
+unsigned int ValidPathInfo::checkSignatures(const PublicKeys & publicKeys) const
+{
+    unsigned int good = 0;
+    for (auto & sig : sigs)
+        if (verifyDetached(fingerprint(), sig, publicKeys))
+            good++;
+    return good;
+}
+
+
 }
 
 
diff --git a/src/libstore/store-api.hh b/src/libstore/store-api.hh
index 62ee811e..b7209d4a 100644
--- a/src/libstore/store-api.hh
+++ b/src/libstore/store-api.hh
@@ -2,6 +2,7 @@
 
 #include "hash.hh"
 #include "serialise.hh"
+#include "crypto.hh"
 
 #include <string>
 #include <limits>
@@ -112,6 +113,20 @@ struct ValidPathInfo
             && narHash == i.narHash
             && references == i.references;
     }
+
+    /*  Return a fingerprint of the store path to be used in binary
+        cache signatures. It contains the store path, the base-32
+        SHA-256 hash of the NAR serialisation of the path, the size of
+        the NAR, and the sorted references. The size field is strictly
+        speaking superfluous, but might prevent endless/excessive data
+        attacks. */
+    std::string fingerprint() const;
+
+    void sign(const SecretKey & secretKey);
+
+    /* Return the number of signatures on this .narinfo that were
+       produced by one of the specified keys. */
+    unsigned int checkSignatures(const PublicKeys & publicKeys) const;
 };
 
 typedef list<ValidPathInfo> ValidPathInfos;