fix tipping planchet derivation

2 files changed, 2 insertions, 8 deletions

diff --git a/packages/taler-wallet-core/src/crypto/talerCrypto.ts b/packages/taler-wallet-core/src/crypto/talerCrypto.ts
index d28f11174..381896858 100644
--- a/packages/taler-wallet-core/src/crypto/talerCrypto.ts
+++ b/packages/taler-wallet-core/src/crypto/talerCrypto.ts
@@ -340,10 +340,6 @@ export function createEcdheKeyPair(): EcdheKeyPair {
   return { ecdhePriv, ecdhePub };
 }
 
-export function createBlindingKeySecret(): Uint8Array {
-  return nacl.randomBytes(32);
-}
-
 export function hash(d: Uint8Array): Uint8Array {
   return nacl.hash(d);
 }
diff --git a/packages/taler-wallet-core/src/crypto/workers/cryptoImplementation.ts b/packages/taler-wallet-core/src/crypto/workers/cryptoImplementation.ts
index fc8b53eb7..9b703e2c8 100644
--- a/packages/taler-wallet-core/src/crypto/workers/cryptoImplementation.ts
+++ b/packages/taler-wallet-core/src/crypto/workers/cryptoImplementation.ts
@@ -48,7 +48,6 @@ import {
   encodeCrock,
   decodeCrock,
   createEddsaKeyPair,
-  createBlindingKeySecret,
   hash,
   rsaBlind,
   eddsaVerify,
@@ -199,12 +198,11 @@ export class CryptoImplementation {
   createTipPlanchet(req: DeriveTipRequest): DerivedTipPlanchet {
     const fc = setupTipPlanchet(decodeCrock(req.secretSeed), req.planchetIndex);
     const denomPub = decodeCrock(req.denomPub);
-    const blindingFactor = createBlindingKeySecret();
     const coinPubHash = hash(fc.coinPub);
-    const ev = rsaBlind(coinPubHash, blindingFactor, denomPub);
+    const ev = rsaBlind(coinPubHash, fc.bks, denomPub);
 
     const tipPlanchet: DerivedTipPlanchet = {
-      blindingKey: encodeCrock(blindingFactor),
+      blindingKey: encodeCrock(fc.bks),
       coinEv: encodeCrock(ev),
       coinEvHash: encodeCrock(hash(ev)),
       coinPriv: encodeCrock(fc.coinPriv),