tighter nimcrypto imports (#532)

eth/common/eth_types.nim

@@ -9,6 +9,9 @@ when (NimMajor, NimMinor) < (1, 4):
 else:
   {.push raises: [].}
 
+## Core ethereum types and smalll helpers - keep focused as it gets imported
+## from many places
+
 import
   std/[options, strutils, times],
   stew/[byteutils, endians2], stint,

eth/p2p/discoveryv5/encoding.nim

@@ -15,7 +15,8 @@
 
 import
   std/[tables, options, hashes, net],
-  nimcrypto, stint, chronicles, stew/[results, byteutils], metrics,
+  nimcrypto/[bcmode, rijndael, sha2], stint, chronicles,
+  stew/[results, byteutils], metrics,
   ".."/../[rlp, keys],
   "."/[messages, node, enr, hkdf, sessions]
 

eth/p2p/discoveryv5/enr.nim

@@ -12,7 +12,7 @@
 
 import
   std/[strutils, macros, algorithm, options],
-  stew/shims/net, stew/[base64, results], nimcrypto,
+  nimcrypto/[keccak, utils], stew/shims/net, stew/[base64, results],
   ".."/../[rlp, keys]
 
 export options, results, keys

eth/p2p/discoveryv5/hkdf.nim

@@ -1,4 +1,7 @@
-import nimcrypto
+import
+  nimcrypto/[hmac, hash]
+
+export hmac, hash
 
 proc hkdf*(HashType: typedesc, ikm, salt, info: openArray[byte],
     output: var openArray[byte]) =

eth/p2p/discoveryv5/node.nim

@@ -9,7 +9,7 @@
 
 import
   std/hashes,
-  nimcrypto, stint, chronos, stew/shims/net, chronicles,
+  nimcrypto/[keccak], stint, chronos, stew/shims/net, chronicles,
   ../../keys, ../../net/utils,
   ./enr
 

eth/p2p/discoveryv5/protocol.nim

@@ -88,8 +88,6 @@ import
   "."/[messages, encoding, node, routing_table, enr, random2, sessions, ip_vote,
     nodes_verification]
 
-import nimcrypto except toHex
-
 export
   options, results, node, enr, encoding.maxDiscv5PacketSize
 

eth/p2p/rlpx.nim

@@ -9,7 +9,7 @@
 
 import
   std/[tables, algorithm, deques, hashes, options, typetraits],
-  stew/shims/macros, chronicles, nimcrypto, chronos,
+  stew/shims/macros, chronicles, nimcrypto/utils, chronos,
   ".."/[rlp, common, keys, async_utils],
   ./private/p2p_types, "."/[kademlia, auth, rlpxcrypt, enode, p2p_protocol_dsl]