RSA wrapper.

extension/background/emscriptif.js

@@ -41,6 +41,10 @@ var emscAlloc = {
     data_to_string_alloc: getEmsc('GNUNET_STRINGS_data_to_string_alloc', 'number', ['number', 'number']),
     purpose_create: getEmsc('TALER_WRALL_purpose_create', 'number', ['number', 'number', 'number']),
     rsa_blind: getEmsc('GNUNET_CRYPTO_rsa_blind', 'number', ['number', 'number', 'number', 'number']),
+    rsa_blinding_key_create: getEmsc('GNUNET_CRYPTO_rsa_blinding_key_create', 'void', ['number']),
+    rsa_blinding_key_encode: getEmsc('GNUNET_CRYPTO_rsa_blinding_key_encode', 'void', ['number', 'number']),
+    rsa_blinding_key_decode: getEmsc('GNUNET_CRYPTO_rsa_blinding_key_decode', 'number', ['number', 'number']),
+    rsa_public_key_decode: getEmsc('GNUNET_CRYPTO_rsa_public_key_decode', 'number', ['number', 'number']),
     malloc: (size) => Module._malloc(size),
 };
 var SignaturePurpose;
@@ -194,6 +198,20 @@ class EddsaPublicKey extends PackedArenaObject {
     size() { return 32; }
 }
 class RsaBlindingKey extends ArenaObject {
+    static create(len, a) {
+        let o = new RsaBlindingKey(a);
+        o.nativePtr = emscAlloc.rsa_blinding_key_create(len);
+        return o;
+    }
+    encode() {
+        let ptr = emscAlloc.malloc(PTR_SIZE);
+        let size = emscAlloc.rsa_blinding_key_encode(this.nativePtr, ptr);
+        let res = new ByteArray(size, Module.getValue(ptr, '*'));
+        let s = res.encode();
+        emsc.free(ptr);
+        res.destroy();
+        return s;
+    }
     destroy() {
         // TODO
     }
@@ -276,6 +294,14 @@ class WithdrawRequestPS extends SignatureStruct {
     }
 }
 class RsaPublicKey extends ArenaObject {
+    static decode(s, a) {
+        let obj = new RsaPublicKey(a);
+        let hstr = emscAlloc.malloc(s.length + 1);
+        Module.writeStringToMemory(s, hstr);
+        obj.nativePtr = emscAlloc.rsa_public_key_decode(hstr, s.length);
+        emsc.free(hstr);
+        return obj;
+    }
     destroy() {
         emsc.rsa_public_key_free(this.nativePtr);
         this.nativePtr = 0;

extension/background/emscriptif.ts

@@ -85,6 +85,18 @@ var emscAlloc = {
   rsa_blind: getEmsc('GNUNET_CRYPTO_rsa_blind',
                           'number',
                           ['number', 'number', 'number', 'number']),
+  rsa_blinding_key_create: getEmsc('GNUNET_CRYPTO_rsa_blinding_key_create',
+                               'void',
+                               ['number']),
+  rsa_blinding_key_encode: getEmsc('GNUNET_CRYPTO_rsa_blinding_key_encode',
+                               'void',
+                               ['number', 'number']),
+  rsa_blinding_key_decode: getEmsc('GNUNET_CRYPTO_rsa_blinding_key_decode',
+                               'number',
+                               ['number', 'number']),
+  rsa_public_key_decode: getEmsc('GNUNET_CRYPTO_rsa_public_key_decode',
+                               'number',
+                               ['number', 'number']),
   malloc: (size: number) => Module._malloc(size),
 };
 
@@ -280,6 +292,22 @@ class EddsaPublicKey extends PackedArenaObject {
 
 
 class RsaBlindingKey extends ArenaObject {
+  static create(len: number, a?: Arena) {
+    let o = new RsaBlindingKey(a);
+    o.nativePtr = emscAlloc.rsa_blinding_key_create(len);
+    return o;
+  }
+
+  encode(): string {
+    let ptr = emscAlloc.malloc(PTR_SIZE);
+    let size = emscAlloc.rsa_blinding_key_encode(this.nativePtr, ptr);
+    let res = new ByteArray(size, Module.getValue(ptr, '*'));
+    let s = res.encode();
+    emsc.free(ptr);
+    res.destroy();
+    return s;
+  }
+
   destroy() {
     // TODO
   }
@@ -375,6 +403,15 @@ class WithdrawRequestPS extends SignatureStruct {
 
 
 class RsaPublicKey extends ArenaObject {
+  static decode(s: string, a?: Arena): RsaPublicKey {
+    let obj = new RsaPublicKey(a);
+    let hstr = emscAlloc.malloc(s.length + 1);
+    Module.writeStringToMemory(s, hstr);
+    obj.nativePtr = emscAlloc.rsa_public_key_decode(hstr, s.length);
+    emsc.free(hstr);
+    return obj;
+  }
+
   destroy() {
     emsc.rsa_public_key_free(this.nativePtr);
     this.nativePtr = 0;
@@ -384,7 +421,7 @@ class RsaPublicKey extends ArenaObject {
 
 function rsaBlind(hashCode: HashCode,
                   blindingKey: RsaBlindingKey, 
-                  pkey: EddsaPublicKey,
+                  pkey: RsaPublicKey,
                   arena?: Arena): ByteArray
 {
   let ptr = emscAlloc.malloc(PTR_SIZE);

extension/background/wallet.js

@@ -115,9 +115,12 @@ function withdraw(denom, reserve, mint) {
         denom_pub: denom.denom_pub,
         reserve_pub: reserve.reserve_pub,
     };
-    let coinPub = EddsaPrivateKey.create();
+    let denomPub = RsaPublicKey.decode(denom.denom_pub);
-    // create RSA blinding key
+    let coinPriv = EddsaPrivateKey.create();
-    // blind coin
+    let coinPub = coinPriv.getPublicKey();
+    let blindingFactor = RsaBlindingKey.create(1024);
+    let pubHash = coinPub.hash();
+    let ev = rsaBlind(pubHash, blindingFactor, denomPub);
     // generate signature
 }
 /**

extension/background/wallet.ts

@@ -128,9 +128,13 @@ function withdraw(denom, reserve, mint) {
     denom_pub: denom.denom_pub,
     reserve_pub: reserve.reserve_pub,
   };
-  let coinPub = EddsaPrivateKey.create();
+  let denomPub = RsaPublicKey.decode(denom.denom_pub);
-  // create RSA blinding key
+  let coinPriv = EddsaPrivateKey.create();
-  // blind coin
+  let coinPub = coinPriv.getPublicKey();
+  let blindingFactor = RsaBlindingKey.create(1024);
+  let pubHash = coinPub.hash();
+  let ev = rsaBlind(pubHash, blindingFactor, denomPub);
+
   // generate signature
 }