wallet-core/extension/background/emscriptif.js

/*

  This file is part of TALER
  Copyright (C) 2014, 2015 Christian Grothoff (and other contributing authors)

  TALER is free software; you can redistribute it and/or modify it under the
  terms of the GNU General Public License as published by the Free Software
  Foundation; either version 3, or (at your option) any later version.

  TALER is distributed in the hope that it will be useful, but WITHOUT ANY
  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

  You should have received a copy of the GNU General Public License along with
  TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
"use strict";
// Size of a native pointer.
const PTR_SIZE = 4;
let getEmsc = Module.cwrap;
var emsc = {
    free: (ptr) => Module._free(ptr),
    get_value: getEmsc('TALER_WR_get_value', 'number', ['number']),
    get_fraction: getEmsc('TALER_WR_get_fraction', 'number', ['number']),
    get_currency: getEmsc('TALER_WR_get_currency', 'string', ['number']),
    amount_add: getEmsc('TALER_amount_add', 'void', ['number', 'number', 'number']),
    amount_subtract: getEmsc('TALER_amount_subtract', 'void', ['number', 'number', 'number']),
    amount_normalize: getEmsc('TALER_amount_normalize', 'void', ['number']),
    amount_cmp: getEmsc('TALER_amount_cmp', 'number', ['number', 'number']),
    amount_hton: getEmsc('TALER_amount_hton', 'void', ['number', 'number']),
    amount_ntoh: getEmsc('TALER_amount_ntoh', 'void', ['number', 'number']),
    hash: getEmsc('GNUNET_CRYPTO_hash', 'void', ['number', 'number', 'number']),
    memmove: getEmsc('memmove', 'number', ['number', 'number', 'number']),
    rsa_public_key_free: getEmsc('GNUNET_CRYPTO_rsa_public_key_free', 'void', ['number']),
    string_to_data: getEmsc('GNUNET_STRINGS_string_to_data', 'void', ['number', 'number', 'number', 'number'])
};
var emscAlloc = {
    get_amount: getEmsc('TALER_WRALL_get_amount', 'number', ['number', 'number', 'number', 'string']),
    eddsa_key_create: getEmsc('GNUNET_CRYPTO_eddsa_key_create', 'number'),
    eddsa_public_key_from_private: getEmsc('TALER_WRALL_eddsa_public_key_from_private', 'number', ['number']),
    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']),
    malloc: (size) => Module._malloc(size),
};
var SignaturePurpose;
(function (SignaturePurpose) {
})(SignaturePurpose || (SignaturePurpose = {}));
class ArenaObject {
    constructor(arena) {
        this.nativePtr = 0;
        if (!arena)
            arena = defaultArena;
        arena.put(this);
        this.arena = arena;
    }
}
class Arena {
    constructor() {
        this.heap = [];
    }
    put(obj) {
        this.heap.push(obj);
    }
    destroy(obj) {
        // XXX: todo
    }
}
// Arena to track allocations that do not use an explicit arena.
var defaultArena = new Arena();
class Amount extends ArenaObject {
    constructor(args, arena) {
        super(arena);
        if (args) {
            this.nativePtr = emscAlloc.get_amount(args.value, 0, args.fraction, args.currency);
        }
        else {
            this.nativePtr = emscAlloc.get_amount(0, 0, 0, "");
        }
    }
    destroy() {
        if (this.nativePtr != 0) {
            emsc.free(this.nativePtr);
        }
    }
    toNbo(a) {
        let x = new AmountNbo(null, a);
        emsc.amount_hton(x.nativePtr, this.nativePtr);
        return x;
    }
    fromNbo(nbo) {
        emsc.amount_ntoh(this.nativePtr, nbo.nativePtr);
    }
    get value() {
        return emsc.get_value(this.nativePtr);
    }
    get fraction() {
        return emsc.get_fraction(this.nativePtr);
    }
    get currency() {
        return emsc.get_currency(this.nativePtr);
    }
    toJson() {
        return {
            value: emsc.get_value(this.nativePtr),
            fraction: emsc.get_fraction(this.nativePtr),
            currency: emsc.get_currency(this.nativePtr)
        };
    }
    /**
     * Add an amount to this amount.
     */
    add(a) {
        let res = emsc.amount_add(this.nativePtr, a.nativePtr, this.nativePtr);
        if (res < 1) {
            // Overflow
            return false;
        }
        return true;
    }
    /**
     * Perform saturating subtraction on amounts.
     */
    sub(a) {
        let res = emsc.amount_subtract(this.nativePtr, a.nativePtr, this.nativePtr);
        if (res == 0) {
            // Underflow
            return false;
        }
        if (res > 0) {
            return true;
        }
        throw "Incompatible currencies";
    }
    cmp(a) {
        return emsc.amount_cmp(this.nativePtr, a.nativePtr);
    }
    normalize() {
        emsc.amount_normalize(this.nativePtr);
    }
}
class PackedArenaObject extends ArenaObject {
    constructor(init, a) {
        super(a);
        if (init === null || init === undefined) {
            this.nativePtr = emscAlloc.malloc(this.size());
        }
        else {
            this.nativePtr = init;
        }
    }
    encode() {
        var d = emscAlloc.data_to_string_alloc(this.nativePtr, this.size());
        var s = Module.Pointer_stringify(d);
        emsc.free(d);
        return s;
    }
    decode(s) {
        // We need to get the javascript string
        // to the emscripten heap first.
        // XXX: Does this work with multi-bytes code points?
        let hstr = emscAlloc.malloc(s.length + 1);
        Module.writeStringToMemory(s, hstr);
        let res = emsc.string_to_data(hstr, s.length, this.nativePtr, this.size());
        if (res < 1) {
            throw { error: "wrong encoding" };
        }
    }
    destroy() {
        emsc.free(this.nativePtr);
        this.nativePtr = 0;
    }
    hash() {
        var x = new HashCode();
        emsc.hash(this.nativePtr, this.size(), x.nativePtr);
        return x;
    }
}
class AmountNbo extends PackedArenaObject {
    size() { return 24; }
}
class EddsaPrivateKey extends PackedArenaObject {
    static create(a) {
        let p = emscAlloc.eddsa_key_create();
        return new EddsaPrivateKey(p, a);
    }
    size() { return 32; }
    getPublicKey() {
        let p = emscAlloc.eddsa_public_key_from_private(this.nativePtr);
        return new EddsaPublicKey(p, this.arena);
    }
}
class EddsaPublicKey extends PackedArenaObject {
    size() { return 32; }
}
class RsaBlindingKey extends ArenaObject {
    destroy() {
        // TODO
    }
}
class HashCode extends PackedArenaObject {
    size() { return 64; }
}
class ByteArray extends PackedArenaObject {
    constructor(desiredSize, init, a) {
        super(init, a);
        if (init === undefined || init === null) {
            this.nativePtr = emscAlloc.malloc(desiredSize);
        }
        else {
            this.nativePtr = init;
        }
        this.allocatedSize = desiredSize;
    }
    size() { return this.allocatedSize; }
}
class EccSignaturePurpose extends PackedArenaObject {
    constructor(purpose, payload, a) {
        this.payload = payload;
        let p = emscAlloc.purpose_create(purpose, payload.nativePtr, payload.size());
        super(p, a);
    }
    size() { return this.payload.size() + 8; }
}
class SignatureStruct {
    constructor() {
        this.members = {};
    }
    toPurpose(a) {
        let totalSize = 0;
        for (let f of this.fieldTypes()) {
            let name = f[0];
            let member = this.members[name];
            if (!member) {
                throw { error: "Member not set", key: name };
            }
            totalSize += this.members[name].size();
        }
        let buf = emscAlloc.malloc(totalSize);
        let ptr = buf;
        for (let f of this.fieldTypes()) {
            let name = f[0];
            let member = this.members[name];
            let size = member.size();
            emsc.memmove(ptr, member.nativePtr, size);
            ptr += size;
        }
        let ba = new ByteArray(totalSize, buf, a);
        let x = new EccSignaturePurpose(this.purpose(), ba, a);
        return x;
    }
    set(name, value) {
        let typemap = {};
        for (let f of this.fieldTypes()) {
            typemap[f[0]] = f[1];
        }
        if (!(name in typemap)) {
            throw { error: "Key not found", key: name };
        }
        if (!(value instanceof typemap[name])) {
            throw { error: "Wrong type", key: name };
        }
        // TODO: check type!
        this.members[name] = value;
    }
}
class WithdrawRequestPS extends SignatureStruct {
    purpose() { return undefined; }
    fieldTypes() {
        return [
            ["reserve_pub", EddsaPublicKey],
            ["amount_with_fee", Amount],
            ["withdraw_fee", Amount],
            ["h_denomination_pub", HashCode],
            ["h_coin_envelope", HashCode]];
    }
}
class RsaPublicKey extends ArenaObject {
    destroy() {
        emsc.rsa_public_key_free(this.nativePtr);
        this.nativePtr = 0;
    }
}
function rsaBlind(hashCode, blindingKey, pkey, arena) {
    let ptr = emscAlloc.malloc(PTR_SIZE);
    let s = emscAlloc.rsa_blind(hashCode.nativePtr, blindingKey.nativePtr, pkey.nativePtr, ptr);
    let res = new ByteArray(s, Module.getValue(ptr, '*'), arena);
    return res;
}