transaction signing

codexvalidator/serialization/protobuf.nim

@@ -1,28 +0,0 @@
-import pkg/protobuf_serialization
-
-export protobuf_serialization
-
-type
-  TransactionMessage* {.proto3.} = object
-    version* {.fieldNumber: 1, pint.}: uint32
-    kind* {.fieldNumber: 2, pint.}: uint32
-    requestId* {.fieldNumber: 3.}: seq[byte]
-    slotIndex* {.fieldNumber: 4, pint.}: uint32
-    period* {.fieldNumber: 5, pint.}: uint64
-    merkleRoot* {.fieldNumber: 6.}: seq[byte]
-    challenge* {.fieldNumber: 7.}: seq[byte]
-    proof* {.fieldNumber: 8.}: Groth16ProofMessage
-  Groth16ProofMessage* {.proto3.} = object
-    a* {.fieldNumber: 1.}: G1PointMessage
-    b* {.fieldNumber: 2.}: G2PointMessage
-    c* {.fieldNumber: 3.}: G1PointMessage
-  G1PointMessage* {.proto3.} = object
-    x* {.fieldNumber: 1.}: seq[byte]
-    y* {.fieldNumber: 2.}: seq[byte]
-  G2PointMessage* {.proto3.} = object
-    x* {.fieldNumber: 1.}: Fp2ElementMessage
-    y* {.fieldNumber: 2.}: Fp2ElementMessage
-  Fp2ElementMessage* {.proto3.} = object
-    real* {.fieldNumber: 1.}: seq[byte]
-    imag* {.fieldNumber: 2.}: seq[byte]
-

codexvalidator/transaction.nim

@@ -1,86 +1,7 @@
-import ./basics
-import ./transaction/storagerequest
-import ./transaction/period
-import ./transaction/groth16
+import ./transaction/transaction
+import ./transaction/signed
+import ./transaction/serialization
 
-export storagerequest
-export period
-export groth16
-
-type
-  TransactionVersion* {.pure.} = enum
-    version0
-  TransactionKind* {.pure.} = enum
-    storageProof
-    missingProof
-  Transaction* = object
-    requestId: StorageRequestId
-    slotIndex: uint32
-    period: Period
-    merkleRoot: UInt256
-    challenge: UInt256
-    case kind: TransactionKind
-    of storageProof:
-      proof: Groth16Proof
-    of missingProof:
-      discard
-
-func storageProof*(
-  _: type Transaction,
-  requestId: StorageRequestId,
-  slotIndex: uint32,
-  period: Period,
-  merkleRoot: UInt256,
-  challenge: UInt256,
-  proof: Groth16Proof
-): Transaction =
-  Transaction(
-    kind: TransactionKind.storageProof,
-    requestId: requestId,
-    period: period,
-    slotIndex: slotIndex,
-    merkleRoot: merkleRoot,
-    challenge: challenge,
-    proof: proof
-  )
-
-func missingProof*(
-  _: type Transaction,
-  requestId: StorageRequestId,
-  slotIndex: uint32,
-  period: Period,
-  merkleRoot: UInt256,
-  challenge: UInt256,
-): Transaction =
-  Transaction(
-    kind: TransactionKind.missingProof,
-    requestId: requestId,
-    slotIndex: slotIndex,
-    period: period,
-    merkleRoot: merkleRoot,
-    challenge: challenge
-  )
-
-func version*(transaction: Transaction): TransactionVersion =
-  TransactionVersion.version0
-
-func kind*(transaction: Transaction): TransactionKind =
-  transaction.kind
-
-func requestId*(transaction: Transaction): StorageRequestId =
-  transaction.requestId
-
-func slotIndex*(transaction: Transaction): uint32 =
-  transaction.slotIndex
-
-func period*(transaction: Transaction): Period =
-  transaction.period
-
-func merkleRoot*(transaction: Transaction): UInt256 =
-  transaction.merkleRoot
-
-func challenge*(transaction: Transaction): UInt256 =
-  transaction.challenge
-
-func proof*(transaction: Transaction): Groth16Proof =
-  transaction.proof
+export transaction
+export signed
+export serialization.toBytes

codexvalidator/transaction/serialization.nim

@@ -1,6 +1,33 @@
-import ./basics
+import pkg/protobuf_serialization
+import ../basics
 import ./transaction
-import ./serialization/protobuf
+
+export protobuf_serialization
+
+type
+  TransactionMessage* {.proto3.} = object
+    version* {.fieldNumber: 1, pint.}: uint32
+    kind* {.fieldNumber: 2, pint.}: uint32
+    requestId* {.fieldNumber: 3.}: seq[byte]
+    slotIndex* {.fieldNumber: 4, pint.}: uint32
+    period* {.fieldNumber: 5, pint.}: uint64
+    merkleRoot* {.fieldNumber: 6.}: seq[byte]
+    challenge* {.fieldNumber: 7.}: seq[byte]
+    proof* {.fieldNumber: 8.}: Groth16ProofMessage
+  Groth16ProofMessage* {.proto3.} = object
+    a* {.fieldNumber: 1.}: G1PointMessage
+    b* {.fieldNumber: 2.}: G2PointMessage
+    c* {.fieldNumber: 3.}: G1PointMessage
+  G1PointMessage* {.proto3.} = object
+    x* {.fieldNumber: 1.}: seq[byte]
+    y* {.fieldNumber: 2.}: seq[byte]
+  G2PointMessage* {.proto3.} = object
+    x* {.fieldNumber: 1.}: Fp2ElementMessage
+    y* {.fieldNumber: 2.}: Fp2ElementMessage
+  Fp2ElementMessage* {.proto3.} = object
+    real* {.fieldNumber: 1.}: seq[byte]
+    imag* {.fieldNumber: 2.}: seq[byte]
+
 
 func toBytes*(transaction: Transaction): seq[byte] =
   var message = TransactionMessage(

codexvalidator/transaction/signed.nim

@@ -0,0 +1,36 @@
+import ../signatures
+import ./transaction
+import ./serialization
+
+type SignedTransaction* = object
+  transaction: Transaction
+  signer: Identifier
+  signature: Signature
+
+func init*(
+  _: type SignedTransaction,
+  transaction: Transaction,
+  signer: Identifier,
+  signature: Signature
+): SignedTransaction =
+  SignedTransaction(
+    transaction: transaction,
+    signer: signer,
+    signature: signature
+  )
+
+func sign*(identity: Identity, transaction: Transaction): SignedTransaction =
+  let signature = identity.sign(transaction.toBytes())
+  SignedTransaction.init(transaction, identity.identifier, signature)
+
+func transaction*(signed: SignedTransaction): Transaction =
+  signed.transaction
+
+func signer*(signed: SignedTransaction): Identifier =
+  signed.signer
+
+func signature*(signed: SignedTransaction): Signature =
+  signed.signature
+
+func verifySignature*(signed: SignedTransaction): bool =
+  signed.signer.verify(signed.transaction.toBytes(), signed.signature)

codexvalidator/transaction/transaction.nim

@@ -0,0 +1,105 @@
+import ../basics
+import ./storagerequest
+import ./period
+import ./groth16
+
+export storagerequest
+export period
+export groth16
+
+type
+  TransactionVersion* {.pure.} = enum
+    version0
+  TransactionKind* {.pure.} = enum
+    storageProof
+    missingProof
+  Transaction* = object
+    requestId: StorageRequestId
+    slotIndex: uint32
+    period: Period
+    merkleRoot: UInt256
+    challenge: UInt256
+    case kind: TransactionKind
+    of storageProof:
+      proof: Groth16Proof
+    of missingProof:
+      discard
+
+func storageProof*(
+  _: type Transaction,
+  requestId: StorageRequestId,
+  slotIndex: uint32,
+  period: Period,
+  merkleRoot: UInt256,
+  challenge: UInt256,
+  proof: Groth16Proof
+): Transaction =
+  Transaction(
+    kind: TransactionKind.storageProof,
+    requestId: requestId,
+    period: period,
+    slotIndex: slotIndex,
+    merkleRoot: merkleRoot,
+    challenge: challenge,
+    proof: proof
+  )
+
+func missingProof*(
+  _: type Transaction,
+  requestId: StorageRequestId,
+  slotIndex: uint32,
+  period: Period,
+  merkleRoot: UInt256,
+  challenge: UInt256,
+): Transaction =
+  Transaction(
+    kind: TransactionKind.missingProof,
+    requestId: requestId,
+    slotIndex: slotIndex,
+    period: period,
+    merkleRoot: merkleRoot,
+    challenge: challenge
+  )
+
+func version*(transaction: Transaction): TransactionVersion =
+  TransactionVersion.version0
+
+func kind*(transaction: Transaction): TransactionKind =
+  transaction.kind
+
+func requestId*(transaction: Transaction): StorageRequestId =
+  transaction.requestId
+
+func slotIndex*(transaction: Transaction): uint32 =
+  transaction.slotIndex
+
+func period*(transaction: Transaction): Period =
+  transaction.period
+
+func merkleRoot*(transaction: Transaction): UInt256 =
+  transaction.merkleRoot
+
+func challenge*(transaction: Transaction): UInt256 =
+  transaction.challenge
+
+func proof*(transaction: Transaction): Groth16Proof =
+  transaction.proof
+
+func `==`*(a, b: Transaction): bool =
+  if a.kind != b.kind:
+    return false
+  if a.requestId != b.requestId:
+    return false
+  if a.slotIndex != b.slotIndex:
+    return false
+  if a.period != b.period:
+    return false
+  if a.merkleRoot != b.merkleRoot:
+    return false
+  if a.challenge != b.challenge:
+    return false
+  case a.kind
+  of TransactionKind.storageProof:
+    a.proof == b.proof
+  of TransactionKind.missingProof:
+    true

tests/codexvalidator/examples.nim

@@ -1,6 +1,7 @@
 import std/random
 import codexvalidator/basics
 import codexvalidator/transaction
+import codexvalidator/signatures
 
 proc example*[T: SomeInteger](_: type T): T =
   rand(T)
@@ -67,3 +68,6 @@ proc example*(_: type Transaction): Transaction =
       challenge,
       proof
     )
+
+proc example*(_: type Identity): Identity =
+  Identity.random(result)

tests/codexvalidator/testSerialization.nim

@@ -1,11 +1,10 @@
 import std/unittest
 import codexvalidator/basics
 import codexvalidator/transaction
-import codexvalidator/serialization
-import codexvalidator/serialization/protobuf
+import codexvalidator/transaction/serialization
 import ./examples
 
-suite "Serialization":
+suite "Transaction serialization":
 
   test "serializes a transaction with protobuf":
     let transaction = Transaction.example

tests/codexvalidator/testTransaction.nim

@@ -1,5 +1,6 @@
 import std/unittest
 import codexvalidator/basics
+import codexvalidator/signatures
 import codexvalidator/transaction
 import ./examples
 
@@ -40,3 +41,20 @@ suite "Transaction":
   test "transactions have a fixed version":
     let transaction = Transaction.example
     check transaction.version == TransactionVersion.version0
+
+  test "transactions can be signed":
+    let identity = Identity.example
+    let transaction = Transaction.example
+    let signed = identity.sign(transaction)
+    check signed.transaction == transaction
+    check signed.signer == identity.identifier
+    check signed.signature == identity.sign(transaction.toBytes())
+
+  test "transaction signature can be verified":
+    let identity = Identity.example
+    let transaction = Transaction.example
+    let signed = identity.sign(transaction)
+    check signed.verifySignature()
+    let forger = Identity.example.identifier
+    let forged = SignedTransaction.init(transaction, forger, signed.signature)
+    check not forged.verifySignature()