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author | Christopher Speller <crspeller@gmail.com> | 2017-03-13 12:54:22 -0400 |
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committer | GitHub <noreply@github.com> | 2017-03-13 12:54:22 -0400 |
commit | c281ee3b61e8ab53ff118866d72618ae8cce582b (patch) | |
tree | 776e7bdf6c8bfbb9a1dee5976496ab065959991f /vendor/golang.org/x/crypto/cryptobyte/example_test.go | |
parent | 3ada7a41a7fb13abef19dd63dc56b720900dbaa9 (diff) | |
download | chat-c281ee3b61e8ab53ff118866d72618ae8cce582b.tar.gz chat-c281ee3b61e8ab53ff118866d72618ae8cce582b.tar.bz2 chat-c281ee3b61e8ab53ff118866d72618ae8cce582b.zip |
Updating server dependancies. Also adding github.com/jaytaylor/html2text and gopkg.in/gomail.v2 (#5748)
Diffstat (limited to 'vendor/golang.org/x/crypto/cryptobyte/example_test.go')
-rw-r--r-- | vendor/golang.org/x/crypto/cryptobyte/example_test.go | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/vendor/golang.org/x/crypto/cryptobyte/example_test.go b/vendor/golang.org/x/crypto/cryptobyte/example_test.go new file mode 100644 index 000000000..7d3c06e12 --- /dev/null +++ b/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) +} |