Vendor dependencies with dep

vendor/golang.org/x/crypto/cryptobyte/example_test.go

@@ -0,0 +1,120 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package cryptobyte_test
+
+import (
+	"encoding/asn1"
+	"fmt"
+	"golang.org/x/crypto/cryptobyte"
+)
+
+func ExampleString_lengthPrefixed() {
+	// This is an example of parsing length-prefixed data (as found in, for
+	// example, TLS). Imagine a 16-bit prefixed series of 8-bit prefixed
+	// strings.
+
+	input := cryptobyte.String([]byte{0, 12, 5, 'h', 'e', 'l', 'l', 'o', 5, 'w', 'o', 'r', 'l', 'd'})
+	var result []string
+
+	var values cryptobyte.String
+	if !input.ReadUint16LengthPrefixed(&values) ||
+		!input.Empty() {
+		panic("bad format")
+	}
+
+	for !values.Empty() {
+		var value cryptobyte.String
+		if !values.ReadUint8LengthPrefixed(&value) {
+			panic("bad format")
+		}
+
+		result = append(result, string(value))
+	}
+
+	// Output: []string{"hello", "world"}
+	fmt.Printf("%#v\n", result)
+}
+
+func ExampleString_asn1() {
+	// This is an example of parsing ASN.1 data that looks like:
+	//    Foo ::= SEQUENCE {
+	//      version [6] INTEGER DEFAULT 0
+	//      data OCTET STRING
+	//    }
+
+	input := cryptobyte.String([]byte{0x30, 12, 0xa6, 3, 2, 1, 2, 4, 5, 'h', 'e', 'l', 'l', 'o'})
+
+	var (
+		version                   int64
+		data, inner, versionBytes cryptobyte.String
+		haveVersion               bool
+	)
+	if !input.ReadASN1(&inner, cryptobyte.Tag(asn1.TagSequence).Constructed()) ||
+		!input.Empty() ||
+		!inner.ReadOptionalASN1(&versionBytes, &haveVersion, cryptobyte.Tag(6).Constructed().ContextSpecific()) ||
+		(haveVersion && !versionBytes.ReadASN1Integer(&version)) ||
+		(haveVersion && !versionBytes.Empty()) ||
+		!inner.ReadASN1(&data, asn1.TagOctetString) ||
+		!inner.Empty() {
+		panic("bad format")
+	}
+
+	// Output: haveVersion: true, version: 2, data: hello
+	fmt.Printf("haveVersion: %t, version: %d, data: %s\n", haveVersion, version, string(data))
+}
+
+func ExampleBuilder_asn1() {
+	// This is an example of building ASN.1 data that looks like:
+	//    Foo ::= SEQUENCE {
+	//      version [6] INTEGER DEFAULT 0
+	//      data OCTET STRING
+	//    }
+
+	version := int64(2)
+	data := []byte("hello")
+	const defaultVersion = 0
+
+	var b cryptobyte.Builder
+	b.AddASN1(cryptobyte.Tag(asn1.TagSequence).Constructed(), func(b *cryptobyte.Builder) {
+		if version != defaultVersion {
+			b.AddASN1(cryptobyte.Tag(6).Constructed().ContextSpecific(), func(b *cryptobyte.Builder) {
+				b.AddASN1Int64(version)
+			})
+		}
+		b.AddASN1OctetString(data)
+	})
+
+	result, err := b.Bytes()
+	if err != nil {
+		panic(err)
+	}
+
+	// Output: 300ca603020102040568656c6c6f
+	fmt.Printf("%x\n", result)
+}
+
+func ExampleBuilder_lengthPrefixed() {
+	// This is an example of building length-prefixed data (as found in,
+	// for example, TLS). Imagine a 16-bit prefixed series of 8-bit
+	// prefixed strings.
+	input := []string{"hello", "world"}
+
+	var b cryptobyte.Builder
+	b.AddUint16LengthPrefixed(func(b *cryptobyte.Builder) {
+		for _, value := range input {
+			b.AddUint8LengthPrefixed(func(b *cryptobyte.Builder) {
+				b.AddBytes([]byte(value))
+			})
+		}
+	})
+
+	result, err := b.Bytes()
+	if err != nil {
+		panic(err)
+	}
+
+	// Output: 000c0568656c6c6f05776f726c64
+	fmt.Printf("%x\n", result)
+}