check contract terms signature, handle errors

2 files changed, 27 insertions, 0 deletions

diff --git a/packages/taler-wallet-core/src/crypto/workers/cryptoApi.ts b/packages/taler-wallet-core/src/crypto/workers/cryptoApi.ts
index 44de6b674..286de5a17 100644
--- a/packages/taler-wallet-core/src/crypto/workers/cryptoApi.ts
+++ b/packages/taler-wallet-core/src/crypto/workers/cryptoApi.ts
@@ -398,6 +398,20 @@ export class CryptoApi {
     );
   }
 
+  isValidContractTermsSignature(
+    contractTermsHash: string,
+    sig: string,
+    merchantPub: string,
+  ): Promise<boolean> {
+    return this.doRpc<boolean>(
+      "isValidContractTermsSignature",
+      4,
+      contractTermsHash,
+      sig,
+      merchantPub,
+    );
+  }
+
   createRecoupRequest(coin: CoinRecord): Promise<RecoupRequest> {
     return this.doRpc<RecoupRequest>("createRecoupRequest", 1, coin);
   }
diff --git a/packages/taler-wallet-core/src/crypto/workers/cryptoImplementation.ts b/packages/taler-wallet-core/src/crypto/workers/cryptoImplementation.ts
index c39ebb44a..46ac7c8a6 100644
--- a/packages/taler-wallet-core/src/crypto/workers/cryptoImplementation.ts
+++ b/packages/taler-wallet-core/src/crypto/workers/cryptoImplementation.ts
@@ -80,6 +80,7 @@ enum SignaturePurpose {
   WALLET_COIN_MELT = 1202,
   TEST = 4242,
   MERCHANT_PAYMENT_OK = 1104,
+  MERCHANT_CONTRACT = 1101,
   WALLET_COIN_RECOUP = 1203,
   WALLET_COIN_LINK = 1204,
   EXCHANGE_CONFIRM_RECOUP = 1039,
@@ -297,6 +298,18 @@ export class CryptoImplementation {
     return eddsaVerify(p, decodeCrock(sig), decodeCrock(masterPub));
   }
 
+  isValidContractTermsSignature(
+    contractTermsHash: string,
+    sig: string,
+    merchantPub: string,
+  ): boolean {
+    const cthDec = decodeCrock(contractTermsHash);
+    const p = buildSigPS(SignaturePurpose.MERCHANT_CONTRACT)
+      .put(cthDec)
+      .build();
+    return eddsaVerify(p, decodeCrock(sig), decodeCrock(merchantPub));
+  }
+
   /**
    * Create a new EdDSA key pair.
    */