From f5ff4afae6a0a1a6cc006a97b529429c539e7a17 Mon Sep 17 00:00:00 2001
From: Florian Dold <florian@dold.me>
Date: Wed, 2 Feb 2022 23:44:36 +0100
Subject: clause schnorr

---
 packages/taler-util/src/talerCrypto.ts | 15 ++++++++++++++-
 packages/taler-util/src/talerTypes.ts  | 20 +++++++++++++++++++-
 2 files changed, 33 insertions(+), 2 deletions(-)

(limited to 'packages/taler-util/src')

diff --git a/packages/taler-util/src/talerCrypto.ts b/packages/taler-util/src/talerCrypto.ts
index 934a04e84..90d52ca72 100644
--- a/packages/taler-util/src/talerCrypto.ts
+++ b/packages/taler-util/src/talerCrypto.ts
@@ -616,8 +616,21 @@ export function hashDenomPub(pub: DenominationPubKey): Uint8Array {
     return nacl.hash(uint8ArrayBuf);
   } else if (pub.cipher === DenomKeyType.LegacyRsa) {
     return hash(decodeCrock(pub.rsa_public_key));
+  } else if (pub.cipher === DenomKeyType.ClauseSchnorr) {
+    const pubBuf = decodeCrock(pub.cs_public_key);
+    const hashInputBuf = new ArrayBuffer(pubBuf.length + 4 + 4);
+    const uint8ArrayBuf = new Uint8Array(hashInputBuf);
+    const dv = new DataView(hashInputBuf);
+    dv.setUint32(0, pub.age_mask ?? 0);
+    dv.setUint32(4, pub.cipher);
+    uint8ArrayBuf.set(pubBuf, 8);
+    return nacl.hash(uint8ArrayBuf);
   } else {
-    throw Error(`unsupported cipher (${pub.cipher}), unable to hash`);
+    throw Error(
+      `unsupported cipher (${
+        (pub as DenominationPubKey).cipher
+      }), unable to hash`,
+    );
   }
 }
 
diff --git a/packages/taler-util/src/talerTypes.ts b/packages/taler-util/src/talerTypes.ts
index 37350c661..7305122bd 100644
--- a/packages/taler-util/src/talerTypes.ts
+++ b/packages/taler-util/src/talerTypes.ts
@@ -1123,7 +1123,8 @@ export interface RsaDenominationPubKey {
 
 export interface CsDenominationPubKey {
   cipher: DenomKeyType.ClauseSchnorr;
-  // FIXME: finish definition
+  age_mask: number;
+  cs_public_key: string;
 }
 
 export namespace DenominationPubKey {
@@ -1151,6 +1152,16 @@ export namespace DenominationPubKey {
         return 1;
       }
       return strcmp(p1.rsa_public_key, p2.rsa_public_key);
+    } else if (
+      p1.cipher === DenomKeyType.ClauseSchnorr &&
+      p2.cipher === DenomKeyType.ClauseSchnorr
+    ) {
+      if ((p1.age_mask ?? 0) < (p2.age_mask ?? 0)) {
+        return -1;
+      } else if ((p1.age_mask ?? 0) > (p2.age_mask ?? 0)) {
+        return 1;
+      }
+      return strcmp(p1.cs_public_key, p2.cs_public_key);
     } else {
       throw Error("unsupported cipher");
     }
@@ -1171,6 +1182,7 @@ export const codecForDenominationPubKey = () =>
   buildCodecForUnion<DenominationPubKey>()
     .discriminateOn("cipher")
     .alternative(1, codecForRsaDenominationPubKey())
+    .alternative(2, codecForCsDenominationPubKey())
     .alternative(3, codecForLegacyRsaDenominationPubKey())
     .build("DenominationPubKey");
 
@@ -1186,6 +1198,12 @@ export const codecForLegacyRsaDenominationPubKey = () =>
     .property("rsa_public_key", codecForString())
     .build("LegacyRsaDenominationPubKey");
 
+export const codecForCsDenominationPubKey = () =>
+  buildCodecForObject<CsDenominationPubKey>()
+    .property("cipher", codecForConstNumber(2))
+    .property("cs_public_key", codecForString())
+    .build("CsDenominationPubKey");
+
 export const codecForBankWithdrawalOperationPostResponse =
   (): Codec<BankWithdrawalOperationPostResponse> =>
     buildCodecForObject<BankWithdrawalOperationPostResponse>()
-- 
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