init commit part2

Signed-off-by: David Liu <david-khala@hotmail.com>

common/crypto/random.go

@@ -0,0 +1,45 @@
+/*
+Copyright IBM Corp. 2016 All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+		 http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package crypto
+
+import (
+	"crypto/rand"
+
+	"github.com/pkg/errors"
+)
+
+const (
+	// NonceSize is the default NonceSize
+	NonceSize = 24
+)
+
+// GetRandomBytes returns len random looking bytes
+func GetRandomBytes(len int) ([]byte, error) {
+	key := make([]byte, len)
+
+	_, err := rand.Read(key)
+	if err != nil {
+		return nil, errors.Wrap(err, "error getting random bytes")
+	}
+
+	return key, nil
+}
+
+// GetRandomNonce returns a random byte array of length NonceSize
+func GetRandomNonce() ([]byte, error) {
+	return GetRandomBytes(NonceSize)
+}

common/crypto/random_test.go

@@ -0,0 +1,25 @@
+/*
+Copyright IBM Corp. 2017 All Rights Reserved.
+
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package crypto
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestGetRandomBytes(t *testing.T) {
+	_, err := GetRandomBytes(10)
+
+	require.NoError(t, err, "GetRandomBytes fails")
+}
+
+func TestGetRandomNonce(t *testing.T) {
+	_, err := GetRandomNonce()
+
+	require.NoError(t, err, "GetRandomNonce fails")
+}

common/go.mod

@@ -0,0 +1,15 @@
+module github.com/hyperledger/fabric-lib-go/common
+
+go 1.20
+
+require (
+	github.com/pkg/errors v0.9.1
+	github.com/stretchr/testify v1.8.4
+	google.golang.org/protobuf v1.32.0
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

common/go.sum

@@ -0,0 +1,16 @@
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
+github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
+google.golang.org/protobuf v1.32.0 h1:pPC6BG5ex8PDFnkbrGU3EixyhKcQ2aDuBS36lqK/C7I=
+google.golang.org/protobuf v1.32.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

common/util/utils.go

@@ -0,0 +1,76 @@
+/*
+Copyright IBM Corp. All Rights Reserved.
+
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package util
+
+import (
+	"crypto/rand"
+	"fmt"
+	"io"
+	"time"
+
+	timestamp "google.golang.org/protobuf/types/known/timestamppb"
+)
+
+// GenerateBytesUUID returns a UUID based on RFC 4122 returning the generated bytes
+func GenerateBytesUUID() []byte {
+	uuid := make([]byte, 16)
+	_, err := io.ReadFull(rand.Reader, uuid)
+	if err != nil {
+		panic(fmt.Sprintf("Error generating UUID: %s", err))
+	}
+
+	// variant bits; see section 4.1.1
+	uuid[8] = uuid[8]&^0xc0 | 0x80
+
+	// version 4 (pseudo-random); see section 4.1.3
+	uuid[6] = uuid[6]&^0xf0 | 0x40
+
+	return uuid
+}
+
+// GenerateUUID returns a UUID based on RFC 4122
+func GenerateUUID() string {
+	uuid := GenerateBytesUUID()
+	return idBytesToStr(uuid)
+}
+
+// CreateUtcTimestamp returns a Timestamp protobuf in UTC
+func CreateUtcTimestamp() *timestamp.Timestamp {
+	now := time.Now().UTC()
+	secs := now.Unix()
+	nanos := int32(now.UnixNano() - (secs * 1000000000))
+	return &(timestamp.Timestamp{Seconds: secs, Nanos: nanos})
+}
+
+func idBytesToStr(id []byte) string {
+	return fmt.Sprintf("%x-%x-%x-%x-%x", id[0:4], id[4:6], id[6:8], id[8:10], id[10:])
+}
+
+// ToChaincodeArgs converts string args to []byte args
+func ToChaincodeArgs(args ...string) [][]byte {
+	bargs := make([][]byte, len(args))
+	for i, arg := range args {
+		bargs[i] = []byte(arg)
+	}
+	return bargs
+}
+
+// ConcatenateBytes is useful for combining multiple arrays of bytes, especially for
+// signatures or digests over multiple fields
+// This way is more efficient in speed
+func ConcatenateBytes(data ...[]byte) []byte {
+	finalLength := 0
+	for _, slice := range data {
+		finalLength += len(slice)
+	}
+	result := make([]byte, finalLength)
+	last := 0
+	for _, slice := range data {
+		last += copy(result[last:], slice)
+	}
+	return result
+}

common/util/utils_test.go

@@ -0,0 +1,78 @@
+/*
+Copyright IBM Corp. 2016 All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+		 http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package util
+
+import (
+	"bytes"
+	"testing"
+	"time"
+)
+
+func TestUUIDGeneration(t *testing.T) {
+	uuid := GenerateUUID()
+	if len(uuid) != 36 {
+		t.Fatalf("UUID length is not correct. Expected = 36, Got = %d", len(uuid))
+	}
+	uuid2 := GenerateUUID()
+	if uuid == uuid2 {
+		t.Fatalf("Two UUIDs are equal. This should never occur")
+	}
+}
+
+func TestTimestamp(t *testing.T) {
+	for i := 0; i < 10; i++ {
+		t.Logf("timestamp now: %v", CreateUtcTimestamp())
+		time.Sleep(200 * time.Millisecond)
+	}
+}
+
+func TestToChaincodeArgs(t *testing.T) {
+	expected := [][]byte{[]byte("foo"), []byte("bar")}
+	actual := ToChaincodeArgs("foo", "bar")
+	if len(expected) != len(actual) {
+		t.Fatalf("Got %v, expected %v", actual, expected)
+	}
+	for i := range expected {
+		if !bytes.Equal(expected[i], actual[i]) {
+			t.Fatalf("Got %v, expected %v", actual, expected)
+		}
+	}
+}
+
+func TestConcatenateBytesNormal(t *testing.T) {
+	first := []byte("first")
+	second := []byte("second")
+	third := []byte("third")
+
+	result := ConcatenateBytes(first, second, third)
+	expected := []byte("firstsecondthird")
+	if !bytes.Equal(result, expected) {
+		t.Errorf("Did not concatenate bytes correctly, expected %s, got %s", expected, result)
+	}
+}
+
+func TestConcatenateBytesNil(t *testing.T) {
+	first := []byte("first")
+	second := []byte(nil)
+	third := []byte("third")
+
+	result := ConcatenateBytes(first, second, third)
+	expected := []byte("firstthird")
+	if !bytes.Equal(result, expected) {
+		t.Errorf("Did not concatenate bytes correctly, expected %s, got %s", expected, result)
+	}
+}

protoutil/go.sum

@@ -0,0 +1,41 @@
+github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
+github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
+github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg=
+github.com/golang/protobuf v1.5.3/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
+github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
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+github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
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