Export bech32 and bech32m functions (trustwallet#4101)

* Export bech32 and bech32m functions

* Fix test cases

* Merge bech32m functions into TWBech32 struct

* Fix failed test cases

* Fix failed swift test case

android/app/src/androidTest/java/com/trustwallet/core/app/utils/TestBech32.kt

@@ -0,0 +1,49 @@
+package com.trustwallet.core.app.utils
+
+import org.junit.Assert.*
+import org.junit.Test
+import wallet.core.jni.Bech32
+
+class TestBech32 {
+    init {
+        System.loadLibrary("TrustWalletCore");
+    }
+
+    @Test
+    fun testEncode() {
+        val data = Numeric.hexStringToByteArray("00443214c74254b635cf84653a56d7c675be77df")
+        assertEquals(Bech32.encode("abcdef", data), "abcdef1qpzry9x8gf2tvdw0s3jn54khce6mua7lmqqqxw")
+    }
+
+    @Test
+    fun testDecode() {
+        val decoded = Bech32.decode("abcdef1qpzry9x8gf2tvdw0s3jn54khce6mua7lmqqqxw")
+        assertEquals(Numeric.toHexString(decoded), "0x00443214c74254b635cf84653a56d7c675be77df")
+    }
+
+    @Test
+    fun testDecodeWrongChecksumVariant() {
+        // This is a Bech32m variant, not Bech32 variant. So it should fail using Bech32 decoder.
+        val decoded = Bech32.decode("abcdef1l7aum6echk45nj3s0wdvt2fg8x9yrzpqzd3ryx")
+        assertNull(decoded)
+    }
+
+    @Test
+    fun testEncodeM() {
+        val data = Numeric.hexStringToByteArray("ffbbcdeb38bdab49ca307b9ac5a928398a418820")
+        assertEquals(Bech32.encodeM("abcdef", data), "abcdef1l7aum6echk45nj3s0wdvt2fg8x9yrzpqzd3ryx")
+    }
+
+    @Test
+    fun testDecodeM() {
+        val decoded = Bech32.decodeM("abcdef1l7aum6echk45nj3s0wdvt2fg8x9yrzpqzd3ryx")
+        assertEquals(Numeric.toHexString(decoded), "0xffbbcdeb38bdab49ca307b9ac5a928398a418820")
+    }
+
+    @Test
+    fun testDecodeMWrongChecksumVariant() {
+        // This is a Bech32 variant, not Bech32m variant. So it should fail using Bech32M decoder.
+        val decoded = Bech32.decodeM("abcdef1qpzry9x8gf2tvdw0s3jn54khce6mua7lmqqqxw")
+        assertNull(decoded)
+    }
+}

codegen-v2/manifest/TWBech32.yaml

@@ -0,0 +1,78 @@
+name: TWBech32
+structs:
+- name: TWBech32
+  is_public: true
+  is_class: false
+functions:
+- name: TWBech32Encode
+  is_public: true
+  is_static: true
+  params:
+  - name: hrp
+    type:
+      variant: string
+      is_constant: true
+      is_nullable: false
+      is_pointer: true
+  - name: data
+    type:
+      variant: data
+      is_constant: true
+      is_nullable: false
+      is_pointer: true
+  return_type:
+    variant: string
+    is_constant: true
+    is_nullable: false
+    is_pointer: true
+- name: TWBech32Decode
+  is_public: true
+  is_static: true
+  params:
+  - name: string
+    type:
+      variant: string
+      is_constant: true
+      is_nullable: false
+      is_pointer: true
+  return_type:
+    variant: data
+    is_constant: true
+    is_nullable: true
+    is_pointer: true
+- name: TWBech32EncodeM
+  is_public: true
+  is_static: true
+  params:
+    - name: hrp
+      type:
+        variant: string
+        is_constant: true
+        is_nullable: false
+        is_pointer: true
+    - name: data
+      type:
+        variant: data
+        is_constant: true
+        is_nullable: false
+        is_pointer: true
+  return_type:
+    variant: string
+    is_constant: true
+    is_nullable: false
+    is_pointer: true
+- name: TWBech32DecodeM
+  is_public: true
+  is_static: true
+  params:
+    - name: string
+      type:
+        variant: string
+        is_constant: true
+        is_nullable: false
+        is_pointer: true
+  return_type:
+    variant: data
+    is_constant: true
+    is_nullable: true
+    is_pointer: true

include/TrustWalletCore/TWBase58.h

@@ -31,14 +31,14 @@ TWString *_Nonnull TWBase58EncodeNoCheck(TWData *_Nonnull data);
 /// Decodes a Base58 string, checking the checksum. Returns null if the string is not a valid Base58 string.
 ///
 /// \param string The Base58 string to decode.
-/// \return the decoded data, empty if the string is not a valid Base58 string with checksum.
+/// \return the decoded data, null if the string is not a valid Base58 string with checksum.
 TW_EXPORT_STATIC_METHOD
 TWData *_Nullable TWBase58Decode(TWString *_Nonnull string);
 
 /// Decodes a Base58 string, w/o checking the checksum. Returns null if the string is not a valid Base58 string.
 ///
 /// \param string The Base58 string to decode.
-/// \return the decoded data, empty if the string is not a valid Base58 string without checksum.
+/// \return the decoded data, null if the string is not a valid Base58 string without checksum.
 TW_EXPORT_STATIC_METHOD
 TWData *_Nullable TWBase58DecodeNoCheck(TWString *_Nonnull string);
 

include/TrustWalletCore/TWBech32.h

@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: Apache-2.0
+//
+// Copyright © 2017 Trust Wallet.
+
+#pragma once
+
+#include "TWBase.h"
+#include "TWData.h"
+#include "TWString.h"
+
+TW_EXTERN_C_BEGIN
+
+/// Bech32 encode / decode functions
+TW_EXPORT_STRUCT
+struct TWBech32;
+
+/// Encodes data as a Bech32 string.
+///
+/// \param hrp The human-readable part.
+/// \param data The data part.
+/// \return the encoded Bech32 string.
+TW_EXPORT_STATIC_METHOD
+TWString *_Nonnull TWBech32Encode(TWString* _Nonnull hrp, TWData *_Nonnull data);
+
+/// Decodes a Bech32 string. Returns null if the string is not a valid Bech32 string.
+///
+/// \param string The Bech32 string to decode.
+/// \return the decoded data, null if the string is not a valid Bech32 string. Note that the human-readable part is not returned.
+TW_EXPORT_STATIC_METHOD
+TWData *_Nullable TWBech32Decode(TWString *_Nonnull string);
+
+/// Encodes data as a Bech32m string.
+///
+/// \param hrp The human-readable part.
+/// \param data The data part.
+/// \return the encoded Bech32m string.
+TW_EXPORT_STATIC_METHOD
+TWString *_Nonnull TWBech32EncodeM(TWString* _Nonnull hrp, TWData *_Nonnull data);
+
+/// Decodes a Bech32m string. Returns null if the string is not a valid Bech32m string.
+///
+/// \param string The Bech32m string to decode.
+/// \return the decoded data, null if the string is not a valid Bech32m string. Note that the human-readable part is not returned.
+TW_EXPORT_STATIC_METHOD
+TWData *_Nullable TWBech32DecodeM(TWString *_Nonnull string);
+
+TW_EXTERN_C_END

src/Bech32.cpp

@@ -103,7 +103,7 @@ Data create_checksum(const std::string& hrp, const Data& values, ChecksumVariant
 
 } // namespace
 
-/** Encode a Bech32 string. */
+/** Encode a Bech32 string. Note that the values must each encode 5 bits, normally get from convertBits<8, 5, true> */
 std::string encode(const std::string& hrp, const Data& values, ChecksumVariant variant) {
     Data checksum = create_checksum(hrp, values, variant);
     Data combined = values;
@@ -116,7 +116,7 @@ std::string encode(const std::string& hrp, const Data& values, ChecksumVariant v
     return ret;
 }
 
-/** Decode a Bech32 string. */
+/** Decode a Bech32 string. Note that the returned values are 5 bits each, you may want to use convertBits<5, 8, false> */
 std::tuple<std::string, Data, ChecksumVariant> decode(const std::string& str) {
     if (str.length() > 120 || str.length() < 2) {
         // too long or too short

src/interface/TWBech32.cpp

@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: Apache-2.0
+//
+// Copyright © 2017 Trust Wallet.
+
+#include <TrustWalletCore/TWBech32.h>
+
+#include "../Bech32.h"
+
+#include <string>
+
+using namespace TW;
+
+static TWString *_Nonnull encodeGeneric(TWString* _Nonnull hrp, TWData *_Nonnull data, const Bech32::ChecksumVariant variant) {
+    const auto cppHrp = *static_cast<const std::string*>(hrp);
+    const auto cppData = *static_cast<const Data*>(data);
+    Data enc;
+    if (!Bech32::convertBits<8, 5, true>(enc, cppData)) {
+        return TWStringCreateWithUTF8Bytes("");
+    }
+    const auto result = Bech32::encode(cppHrp, enc, variant);
+    return TWStringCreateWithUTF8Bytes(result.c_str());
+}
+
+static TWData *_Nullable decodeGeneric(TWString *_Nonnull string, const Bech32::ChecksumVariant variant) {
+    const auto cppString = *static_cast<const std::string*>(string);
+    const auto decoded = Bech32::decode(cppString);
+
+    const auto data = std::get<1>(decoded);
+    if (data.empty()) { // Failed to decode
+        return nullptr;
+    }
+
+    if (std::get<2>(decoded) != variant) { // Wrong ChecksumVariant
+        return nullptr;
+    }
+
+    // Bech bits conversion
+    Data conv;
+    if (!Bech32::convertBits<5, 8, false>(conv, data)) {
+        return nullptr;
+    }
+
+    return TWDataCreateWithBytes(conv.data(), conv.size());
+}
+
+TWString *_Nonnull TWBech32Encode(TWString* _Nonnull hrp, TWData *_Nonnull data) {
+    return encodeGeneric(hrp, data, Bech32::ChecksumVariant::Bech32);
+}
+
+TWString *_Nonnull TWBech32EncodeM(TWString* _Nonnull hrp, TWData *_Nonnull data) {
+    return encodeGeneric(hrp, data, Bech32::ChecksumVariant::Bech32M);
+}
+
+TWData *_Nullable TWBech32Decode(TWString *_Nonnull string) {
+    return decodeGeneric(string, Bech32::ChecksumVariant::Bech32);
+}
+
+TWData *_Nullable TWBech32DecodeM(TWString *_Nonnull string) {
+        return decodeGeneric(string, Bech32::ChecksumVariant::Bech32M);
+}

swift/Tests/Bech32Tests.swift

@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: Apache-2.0
+//
+// Copyright © 2017 Trust Wallet.
+
+import XCTest
+import WalletCore
+
+class Bech32Tests: XCTestCase {
+    func testEncode()  {
+        let data = Data(hexString: "00443214c74254b635cf84653a56d7c675be77df")!
+        let encoded = Bech32.encode(hrp: "abcdef", data: data)
+        XCTAssertEqual(encoded, "abcdef1qpzry9x8gf2tvdw0s3jn54khce6mua7lmqqqxw")
+    }
+
+    func testDecode()  {
+        let decoded = Bech32.decode(string: "abcdef1qpzry9x8gf2tvdw0s3jn54khce6mua7lmqqqxw")!
+        XCTAssertEqual(decoded.hexString, "00443214c74254b635cf84653a56d7c675be77df")
+    }
+
+    func testDecodeWrongChecksumVariant()  {
+        // This is a Bech32m variant, not Bech32 variant. So it should fail using Bech32 decoder.
+        let decoded = Bech32.decode(string: "abcdef1l7aum6echk45nj3s0wdvt2fg8x9yrzpqzd3ryx")
+        XCTAssertNil(decoded)
+    }
+
+    func testEncodeM()  {
+        let data = Data(hexString: "ffbbcdeb38bdab49ca307b9ac5a928398a418820")!
+        let encoded = Bech32.encodeM(hrp: "abcdef", data: data)
+        XCTAssertEqual(encoded, "abcdef1l7aum6echk45nj3s0wdvt2fg8x9yrzpqzd3ryx")
+    }
+
+    func testDecodeM()  {
+        let decoded = Bech32.decodeM(string: "abcdef1l7aum6echk45nj3s0wdvt2fg8x9yrzpqzd3ryx")!
+        XCTAssertEqual(decoded.hexString, "ffbbcdeb38bdab49ca307b9ac5a928398a418820")
+    }
+
+    func testDecodeMWrongChecksumVariant()  {
+        // This is a Bech32 variant, not Bech32m variant. So it should fail using Bech32M decoder.
+        let decoded = Bech32.decodeM(string: "abcdef1qpzry9x8gf2tvdw0s3jn54khce6mua7lmqqqxw")
+        XCTAssertNil(decoded)
+    }
+}

tests/interface/TWBech32Tests.cpp

@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: Apache-2.0
+//
+// Copyright © 2017 Trust Wallet.
+
+#include "TestUtilities.h"
+
+#include <TrustWalletCore/TWBech32.h>
+
+#include <gtest/gtest.h>
+
+TEST(TWBech32, Encode) {
+    const auto hrp = STRING("abcdef");
+    const auto data = DATA("00443214c74254b635cf84653a56d7c675be77df");
+    const auto result = WRAPS(TWBech32Encode(hrp.get(), data.get()));
+    assertStringsEqual(result, "abcdef1qpzry9x8gf2tvdw0s3jn54khce6mua7lmqqqxw");
+}
+
+TEST(TWBech32, Decode) {
+    const auto input = STRING("abcdef1qpzry9x8gf2tvdw0s3jn54khce6mua7lmqqqxw");
+    const auto result = WRAPD(TWBech32Decode(input.get()));
+    assertHexEqual(result, "00443214c74254b635cf84653a56d7c675be77df");
+}
+
+TEST(TWBech32, Decode_WrongChecksumVariant) {
+    // This is a Bech32m variant, not Bech32 variant. So it should fail using Bech32 decoder.
+    const auto input = STRING("abcdef1l7aum6echk45nj3s0wdvt2fg8x9yrzpqzd3ryx");
+    const auto result = WRAPD(TWBech32Decode(input.get()));
+    ASSERT_EQ(result.get(), nullptr);
+}
+
+TEST(TWBech32, EncodeM) {
+    const auto hrp = STRING("abcdef");
+    const auto data = DATA("ffbbcdeb38bdab49ca307b9ac5a928398a418820");
+    const auto result = WRAPS(TWBech32EncodeM(hrp.get(), data.get()));
+    assertStringsEqual(result, "abcdef1l7aum6echk45nj3s0wdvt2fg8x9yrzpqzd3ryx");
+}
+
+TEST(TWBech32, DecodeM) {
+    const auto input = STRING("abcdef1l7aum6echk45nj3s0wdvt2fg8x9yrzpqzd3ryx");
+    auto result = WRAPD(TWBech32DecodeM(input.get()));
+    assertHexEqual(result, "ffbbcdeb38bdab49ca307b9ac5a928398a418820");
+}
+
+TEST(TWBech32, DecodeM_WrongChecksumVariant) {
+    // This is a Bech32 variant, not Bech32m variant. So it should fail using Bech32M decoder.
+    const auto input = STRING("abcdef1qpzry9x8gf2tvdw0s3jn54khce6mua7lmqqqxw");
+    const auto result = WRAPD(TWBech32DecodeM(input.get()));
+    ASSERT_EQ(result.get(), nullptr);
+}