Remove encryption code from containerd core
We are separating out the encryption code and have designed a few new interfaces and APIs for processing content streams. This keep the core clean of encryption code but enables not only encryption but support of multiple content types ( custom media types ). Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
This commit is contained in:
Michael Crosby
22
vendor/github.com/fullsailor/pkcs7/LICENSE
generated
vendored
22
vendor/github.com/fullsailor/pkcs7/LICENSE
generated
vendored
@@ -1,22 +0,0 @@
|
||||
The MIT License (MIT)
|
||||
|
||||
Copyright (c) 2015 Andrew Smith
|
||||
|
||||
Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
of this software and associated documentation files (the "Software"), to deal
|
||||
in the Software without restriction, including without limitation the rights
|
||||
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
copies of the Software, and to permit persons to whom the Software is
|
||||
furnished to do so, subject to the following conditions:
|
||||
|
||||
The above copyright notice and this permission notice shall be included in all
|
||||
copies or substantial portions of the Software.
|
||||
|
||||
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
SOFTWARE.
|
||||
|
||||
8
vendor/github.com/fullsailor/pkcs7/README.md
generated
vendored
8
vendor/github.com/fullsailor/pkcs7/README.md
generated
vendored
@@ -1,8 +0,0 @@
|
||||
# pkcs7
|
||||
|
||||
[](https://godoc.org/github.com/fullsailor/pkcs7)
|
||||
[](https://travis-ci.org/fullsailor/pkcs7)
|
||||
|
||||
pkcs7 implements parsing and creating signed and enveloped messages.
|
||||
|
||||
- Documentation on [GoDoc](http://godoc.org/github.com/fullsailor/pkcs7)
|
||||
248
vendor/github.com/fullsailor/pkcs7/ber.go
generated
vendored
248
vendor/github.com/fullsailor/pkcs7/ber.go
generated
vendored
@@ -1,248 +0,0 @@
|
||||
package pkcs7
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"errors"
|
||||
)
|
||||
|
||||
var encodeIndent = 0
|
||||
|
||||
type asn1Object interface {
|
||||
EncodeTo(writer *bytes.Buffer) error
|
||||
}
|
||||
|
||||
type asn1Structured struct {
|
||||
tagBytes []byte
|
||||
content []asn1Object
|
||||
}
|
||||
|
||||
func (s asn1Structured) EncodeTo(out *bytes.Buffer) error {
|
||||
//fmt.Printf("%s--> tag: % X\n", strings.Repeat("| ", encodeIndent), s.tagBytes)
|
||||
encodeIndent++
|
||||
inner := new(bytes.Buffer)
|
||||
for _, obj := range s.content {
|
||||
err := obj.EncodeTo(inner)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
encodeIndent--
|
||||
out.Write(s.tagBytes)
|
||||
encodeLength(out, inner.Len())
|
||||
out.Write(inner.Bytes())
|
||||
return nil
|
||||
}
|
||||
|
||||
type asn1Primitive struct {
|
||||
tagBytes []byte
|
||||
length int
|
||||
content []byte
|
||||
}
|
||||
|
||||
func (p asn1Primitive) EncodeTo(out *bytes.Buffer) error {
|
||||
_, err := out.Write(p.tagBytes)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if err = encodeLength(out, p.length); err != nil {
|
||||
return err
|
||||
}
|
||||
//fmt.Printf("%s--> tag: % X length: %d\n", strings.Repeat("| ", encodeIndent), p.tagBytes, p.length)
|
||||
//fmt.Printf("%s--> content length: %d\n", strings.Repeat("| ", encodeIndent), len(p.content))
|
||||
out.Write(p.content)
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func ber2der(ber []byte) ([]byte, error) {
|
||||
if len(ber) == 0 {
|
||||
return nil, errors.New("ber2der: input ber is empty")
|
||||
}
|
||||
//fmt.Printf("--> ber2der: Transcoding %d bytes\n", len(ber))
|
||||
out := new(bytes.Buffer)
|
||||
|
||||
obj, _, err := readObject(ber, 0)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
obj.EncodeTo(out)
|
||||
|
||||
// if offset < len(ber) {
|
||||
// return nil, fmt.Errorf("ber2der: Content longer than expected. Got %d, expected %d", offset, len(ber))
|
||||
//}
|
||||
|
||||
return out.Bytes(), nil
|
||||
}
|
||||
|
||||
// encodes lengths that are longer than 127 into string of bytes
|
||||
func marshalLongLength(out *bytes.Buffer, i int) (err error) {
|
||||
n := lengthLength(i)
|
||||
|
||||
for ; n > 0; n-- {
|
||||
err = out.WriteByte(byte(i >> uint((n-1)*8)))
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// computes the byte length of an encoded length value
|
||||
func lengthLength(i int) (numBytes int) {
|
||||
numBytes = 1
|
||||
for i > 255 {
|
||||
numBytes++
|
||||
i >>= 8
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
// encodes the length in DER format
|
||||
// If the length fits in 7 bits, the value is encoded directly.
|
||||
//
|
||||
// Otherwise, the number of bytes to encode the length is first determined.
|
||||
// This number is likely to be 4 or less for a 32bit length. This number is
|
||||
// added to 0x80. The length is encoded in big endian encoding follow after
|
||||
//
|
||||
// Examples:
|
||||
// length | byte 1 | bytes n
|
||||
// 0 | 0x00 | -
|
||||
// 120 | 0x78 | -
|
||||
// 200 | 0x81 | 0xC8
|
||||
// 500 | 0x82 | 0x01 0xF4
|
||||
//
|
||||
func encodeLength(out *bytes.Buffer, length int) (err error) {
|
||||
if length >= 128 {
|
||||
l := lengthLength(length)
|
||||
err = out.WriteByte(0x80 | byte(l))
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
err = marshalLongLength(out, length)
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
} else {
|
||||
err = out.WriteByte(byte(length))
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func readObject(ber []byte, offset int) (asn1Object, int, error) {
|
||||
//fmt.Printf("\n====> Starting readObject at offset: %d\n\n", offset)
|
||||
tagStart := offset
|
||||
b := ber[offset]
|
||||
offset++
|
||||
tag := b & 0x1F // last 5 bits
|
||||
if tag == 0x1F {
|
||||
tag = 0
|
||||
for ber[offset] >= 0x80 {
|
||||
tag = tag*128 + ber[offset] - 0x80
|
||||
offset++
|
||||
}
|
||||
tag = tag*128 + ber[offset] - 0x80
|
||||
offset++
|
||||
}
|
||||
tagEnd := offset
|
||||
|
||||
kind := b & 0x20
|
||||
/*
|
||||
if kind == 0 {
|
||||
fmt.Print("--> Primitive\n")
|
||||
} else {
|
||||
fmt.Print("--> Constructed\n")
|
||||
}
|
||||
*/
|
||||
// read length
|
||||
var length int
|
||||
l := ber[offset]
|
||||
offset++
|
||||
indefinite := false
|
||||
if l > 0x80 {
|
||||
numberOfBytes := (int)(l & 0x7F)
|
||||
if numberOfBytes > 4 { // int is only guaranteed to be 32bit
|
||||
return nil, 0, errors.New("ber2der: BER tag length too long")
|
||||
}
|
||||
if numberOfBytes == 4 && (int)(ber[offset]) > 0x7F {
|
||||
return nil, 0, errors.New("ber2der: BER tag length is negative")
|
||||
}
|
||||
if 0x0 == (int)(ber[offset]) {
|
||||
return nil, 0, errors.New("ber2der: BER tag length has leading zero")
|
||||
}
|
||||
//fmt.Printf("--> (compute length) indicator byte: %x\n", l)
|
||||
//fmt.Printf("--> (compute length) length bytes: % X\n", ber[offset:offset+numberOfBytes])
|
||||
for i := 0; i < numberOfBytes; i++ {
|
||||
length = length*256 + (int)(ber[offset])
|
||||
offset++
|
||||
}
|
||||
} else if l == 0x80 {
|
||||
indefinite = true
|
||||
} else {
|
||||
length = (int)(l)
|
||||
}
|
||||
|
||||
//fmt.Printf("--> length : %d\n", length)
|
||||
contentEnd := offset + length
|
||||
if contentEnd > len(ber) {
|
||||
return nil, 0, errors.New("ber2der: BER tag length is more than available data")
|
||||
}
|
||||
//fmt.Printf("--> content start : %d\n", offset)
|
||||
//fmt.Printf("--> content end : %d\n", contentEnd)
|
||||
//fmt.Printf("--> content : % X\n", ber[offset:contentEnd])
|
||||
var obj asn1Object
|
||||
if indefinite && kind == 0 {
|
||||
return nil, 0, errors.New("ber2der: Indefinite form tag must have constructed encoding")
|
||||
}
|
||||
if kind == 0 {
|
||||
obj = asn1Primitive{
|
||||
tagBytes: ber[tagStart:tagEnd],
|
||||
length: length,
|
||||
content: ber[offset:contentEnd],
|
||||
}
|
||||
} else {
|
||||
var subObjects []asn1Object
|
||||
for (offset < contentEnd) || indefinite {
|
||||
var subObj asn1Object
|
||||
var err error
|
||||
subObj, offset, err = readObject(ber, offset)
|
||||
if err != nil {
|
||||
return nil, 0, err
|
||||
}
|
||||
subObjects = append(subObjects, subObj)
|
||||
|
||||
if indefinite {
|
||||
terminated, err := isIndefiniteTermination(ber, offset)
|
||||
if err != nil {
|
||||
return nil, 0, err
|
||||
}
|
||||
|
||||
if terminated {
|
||||
break
|
||||
}
|
||||
}
|
||||
}
|
||||
obj = asn1Structured{
|
||||
tagBytes: ber[tagStart:tagEnd],
|
||||
content: subObjects,
|
||||
}
|
||||
}
|
||||
|
||||
// Apply indefinite form length with 0x0000 terminator.
|
||||
if indefinite {
|
||||
contentEnd = offset + 2
|
||||
}
|
||||
|
||||
return obj, contentEnd, nil
|
||||
}
|
||||
|
||||
func isIndefiniteTermination(ber []byte, offset int) (bool, error) {
|
||||
if len(ber) - offset < 2 {
|
||||
return false, errors.New("ber2der: Invalid BER format")
|
||||
}
|
||||
|
||||
return bytes.Index(ber[offset:], []byte{0x0, 0x0}) == 0, nil
|
||||
}
|
||||
962
vendor/github.com/fullsailor/pkcs7/pkcs7.go
generated
vendored
962
vendor/github.com/fullsailor/pkcs7/pkcs7.go
generated
vendored
@@ -1,962 +0,0 @@
|
||||
// Package pkcs7 implements parsing and generation of some PKCS#7 structures.
|
||||
package pkcs7
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"crypto"
|
||||
"crypto/aes"
|
||||
"crypto/cipher"
|
||||
"crypto/des"
|
||||
"crypto/hmac"
|
||||
"crypto/rand"
|
||||
"crypto/rsa"
|
||||
"crypto/x509"
|
||||
"crypto/x509/pkix"
|
||||
"encoding/asn1"
|
||||
"errors"
|
||||
"fmt"
|
||||
"math/big"
|
||||
"sort"
|
||||
"time"
|
||||
|
||||
_ "crypto/sha1" // for crypto.SHA1
|
||||
)
|
||||
|
||||
// PKCS7 Represents a PKCS7 structure
|
||||
type PKCS7 struct {
|
||||
Content []byte
|
||||
Certificates []*x509.Certificate
|
||||
CRLs []pkix.CertificateList
|
||||
Signers []signerInfo
|
||||
raw interface{}
|
||||
}
|
||||
|
||||
type contentInfo struct {
|
||||
ContentType asn1.ObjectIdentifier
|
||||
Content asn1.RawValue `asn1:"explicit,optional,tag:0"`
|
||||
}
|
||||
|
||||
// ErrUnsupportedContentType is returned when a PKCS7 content is not supported.
|
||||
// Currently only Data (1.2.840.113549.1.7.1), Signed Data (1.2.840.113549.1.7.2),
|
||||
// and Enveloped Data are supported (1.2.840.113549.1.7.3)
|
||||
var ErrUnsupportedContentType = errors.New("pkcs7: cannot parse data: unimplemented content type")
|
||||
|
||||
type unsignedData []byte
|
||||
|
||||
var (
|
||||
oidData = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 7, 1}
|
||||
oidSignedData = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 7, 2}
|
||||
oidEnvelopedData = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 7, 3}
|
||||
oidSignedAndEnvelopedData = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 7, 4}
|
||||
oidDigestedData = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 7, 5}
|
||||
oidEncryptedData = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 7, 6}
|
||||
oidAttributeContentType = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 9, 3}
|
||||
oidAttributeMessageDigest = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 9, 4}
|
||||
oidAttributeSigningTime = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 9, 5}
|
||||
)
|
||||
|
||||
type signedData struct {
|
||||
Version int `asn1:"default:1"`
|
||||
DigestAlgorithmIdentifiers []pkix.AlgorithmIdentifier `asn1:"set"`
|
||||
ContentInfo contentInfo
|
||||
Certificates rawCertificates `asn1:"optional,tag:0"`
|
||||
CRLs []pkix.CertificateList `asn1:"optional,tag:1"`
|
||||
SignerInfos []signerInfo `asn1:"set"`
|
||||
}
|
||||
|
||||
type rawCertificates struct {
|
||||
Raw asn1.RawContent
|
||||
}
|
||||
|
||||
type envelopedData struct {
|
||||
Version int
|
||||
RecipientInfos []recipientInfo `asn1:"set"`
|
||||
EncryptedContentInfo encryptedContentInfo
|
||||
}
|
||||
|
||||
type recipientInfo struct {
|
||||
Version int
|
||||
IssuerAndSerialNumber issuerAndSerial
|
||||
KeyEncryptionAlgorithm pkix.AlgorithmIdentifier
|
||||
EncryptedKey []byte
|
||||
}
|
||||
|
||||
type encryptedContentInfo struct {
|
||||
ContentType asn1.ObjectIdentifier
|
||||
ContentEncryptionAlgorithm pkix.AlgorithmIdentifier
|
||||
EncryptedContent asn1.RawValue `asn1:"tag:0,optional"`
|
||||
}
|
||||
|
||||
type attribute struct {
|
||||
Type asn1.ObjectIdentifier
|
||||
Value asn1.RawValue `asn1:"set"`
|
||||
}
|
||||
|
||||
type issuerAndSerial struct {
|
||||
IssuerName asn1.RawValue
|
||||
SerialNumber *big.Int
|
||||
}
|
||||
|
||||
// MessageDigestMismatchError is returned when the signer data digest does not
|
||||
// match the computed digest for the contained content
|
||||
type MessageDigestMismatchError struct {
|
||||
ExpectedDigest []byte
|
||||
ActualDigest []byte
|
||||
}
|
||||
|
||||
func (err *MessageDigestMismatchError) Error() string {
|
||||
return fmt.Sprintf("pkcs7: Message digest mismatch\n\tExpected: %X\n\tActual : %X", err.ExpectedDigest, err.ActualDigest)
|
||||
}
|
||||
|
||||
type signerInfo struct {
|
||||
Version int `asn1:"default:1"`
|
||||
IssuerAndSerialNumber issuerAndSerial
|
||||
DigestAlgorithm pkix.AlgorithmIdentifier
|
||||
AuthenticatedAttributes []attribute `asn1:"optional,tag:0"`
|
||||
DigestEncryptionAlgorithm pkix.AlgorithmIdentifier
|
||||
EncryptedDigest []byte
|
||||
UnauthenticatedAttributes []attribute `asn1:"optional,tag:1"`
|
||||
}
|
||||
|
||||
// Parse decodes a DER encoded PKCS7 package
|
||||
func Parse(data []byte) (p7 *PKCS7, err error) {
|
||||
if len(data) == 0 {
|
||||
return nil, errors.New("pkcs7: input data is empty")
|
||||
}
|
||||
var info contentInfo
|
||||
der, err := ber2der(data)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
rest, err := asn1.Unmarshal(der, &info)
|
||||
if len(rest) > 0 {
|
||||
err = asn1.SyntaxError{Msg: "trailing data"}
|
||||
return
|
||||
}
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
|
||||
// fmt.Printf("--> Content Type: %s", info.ContentType)
|
||||
switch {
|
||||
case info.ContentType.Equal(oidSignedData):
|
||||
return parseSignedData(info.Content.Bytes)
|
||||
case info.ContentType.Equal(oidEnvelopedData):
|
||||
return parseEnvelopedData(info.Content.Bytes)
|
||||
}
|
||||
return nil, ErrUnsupportedContentType
|
||||
}
|
||||
|
||||
func parseSignedData(data []byte) (*PKCS7, error) {
|
||||
var sd signedData
|
||||
asn1.Unmarshal(data, &sd)
|
||||
certs, err := sd.Certificates.Parse()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
// fmt.Printf("--> Signed Data Version %d\n", sd.Version)
|
||||
|
||||
var compound asn1.RawValue
|
||||
var content unsignedData
|
||||
|
||||
// The Content.Bytes maybe empty on PKI responses.
|
||||
if len(sd.ContentInfo.Content.Bytes) > 0 {
|
||||
if _, err := asn1.Unmarshal(sd.ContentInfo.Content.Bytes, &compound); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
}
|
||||
// Compound octet string
|
||||
if compound.IsCompound {
|
||||
if _, err = asn1.Unmarshal(compound.Bytes, &content); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
} else {
|
||||
// assuming this is tag 04
|
||||
content = compound.Bytes
|
||||
}
|
||||
return &PKCS7{
|
||||
Content: content,
|
||||
Certificates: certs,
|
||||
CRLs: sd.CRLs,
|
||||
Signers: sd.SignerInfos,
|
||||
raw: sd}, nil
|
||||
}
|
||||
|
||||
func (raw rawCertificates) Parse() ([]*x509.Certificate, error) {
|
||||
if len(raw.Raw) == 0 {
|
||||
return nil, nil
|
||||
}
|
||||
|
||||
var val asn1.RawValue
|
||||
if _, err := asn1.Unmarshal(raw.Raw, &val); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
return x509.ParseCertificates(val.Bytes)
|
||||
}
|
||||
|
||||
func parseEnvelopedData(data []byte) (*PKCS7, error) {
|
||||
var ed envelopedData
|
||||
if _, err := asn1.Unmarshal(data, &ed); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return &PKCS7{
|
||||
raw: ed,
|
||||
}, nil
|
||||
}
|
||||
|
||||
// Verify checks the signatures of a PKCS7 object
|
||||
// WARNING: Verify does not check signing time or verify certificate chains at
|
||||
// this time.
|
||||
func (p7 *PKCS7) Verify() (err error) {
|
||||
if len(p7.Signers) == 0 {
|
||||
return errors.New("pkcs7: Message has no signers")
|
||||
}
|
||||
for _, signer := range p7.Signers {
|
||||
if err := verifySignature(p7, signer); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func verifySignature(p7 *PKCS7, signer signerInfo) error {
|
||||
signedData := p7.Content
|
||||
hash, err := getHashForOID(signer.DigestAlgorithm.Algorithm)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if len(signer.AuthenticatedAttributes) > 0 {
|
||||
// TODO(fullsailor): First check the content type match
|
||||
var digest []byte
|
||||
err := unmarshalAttribute(signer.AuthenticatedAttributes, oidAttributeMessageDigest, &digest)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
h := hash.New()
|
||||
h.Write(p7.Content)
|
||||
computed := h.Sum(nil)
|
||||
if !hmac.Equal(digest, computed) {
|
||||
return &MessageDigestMismatchError{
|
||||
ExpectedDigest: digest,
|
||||
ActualDigest: computed,
|
||||
}
|
||||
}
|
||||
// TODO(fullsailor): Optionally verify certificate chain
|
||||
// TODO(fullsailor): Optionally verify signingTime against certificate NotAfter/NotBefore
|
||||
signedData, err = marshalAttributes(signer.AuthenticatedAttributes)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
cert := getCertFromCertsByIssuerAndSerial(p7.Certificates, signer.IssuerAndSerialNumber)
|
||||
if cert == nil {
|
||||
return errors.New("pkcs7: No certificate for signer")
|
||||
}
|
||||
|
||||
algo := getSignatureAlgorithmFromAI(signer.DigestEncryptionAlgorithm)
|
||||
if algo == x509.UnknownSignatureAlgorithm {
|
||||
// I'm not sure what the spec here is, and the openssl sources were not
|
||||
// helpful. But, this is what App Store receipts appear to do.
|
||||
// The DigestEncryptionAlgorithm is just "rsaEncryption (PKCS #1)"
|
||||
// But we're expecting a digest + encryption algorithm. So... we're going
|
||||
// to determine an algorithm based on the DigestAlgorithm and this
|
||||
// encryption algorithm.
|
||||
if signer.DigestEncryptionAlgorithm.Algorithm.Equal(oidEncryptionAlgorithmRSA) {
|
||||
algo = getRSASignatureAlgorithmForDigestAlgorithm(hash)
|
||||
}
|
||||
}
|
||||
return cert.CheckSignature(algo, signedData, signer.EncryptedDigest)
|
||||
}
|
||||
|
||||
func marshalAttributes(attrs []attribute) ([]byte, error) {
|
||||
encodedAttributes, err := asn1.Marshal(struct {
|
||||
A []attribute `asn1:"set"`
|
||||
}{A: attrs})
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
// Remove the leading sequence octets
|
||||
var raw asn1.RawValue
|
||||
asn1.Unmarshal(encodedAttributes, &raw)
|
||||
return raw.Bytes, nil
|
||||
}
|
||||
|
||||
var (
|
||||
oidDigestAlgorithmSHA1 = asn1.ObjectIdentifier{1, 3, 14, 3, 2, 26}
|
||||
oidEncryptionAlgorithmRSA = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 1}
|
||||
)
|
||||
|
||||
func getCertFromCertsByIssuerAndSerial(certs []*x509.Certificate, ias issuerAndSerial) *x509.Certificate {
|
||||
for _, cert := range certs {
|
||||
if isCertMatchForIssuerAndSerial(cert, ias) {
|
||||
return cert
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func getHashForOID(oid asn1.ObjectIdentifier) (crypto.Hash, error) {
|
||||
switch {
|
||||
case oid.Equal(oidDigestAlgorithmSHA1):
|
||||
return crypto.SHA1, nil
|
||||
case oid.Equal(oidSHA256):
|
||||
return crypto.SHA256, nil
|
||||
}
|
||||
return crypto.Hash(0), ErrUnsupportedAlgorithm
|
||||
}
|
||||
|
||||
func getRSASignatureAlgorithmForDigestAlgorithm(hash crypto.Hash) x509.SignatureAlgorithm {
|
||||
for _, details := range signatureAlgorithmDetails {
|
||||
if details.pubKeyAlgo == x509.RSA && details.hash == hash {
|
||||
return details.algo
|
||||
}
|
||||
}
|
||||
return x509.UnknownSignatureAlgorithm
|
||||
}
|
||||
|
||||
// GetOnlySigner returns an x509.Certificate for the first signer of the signed
|
||||
// data payload. If there are more or less than one signer, nil is returned
|
||||
func (p7 *PKCS7) GetOnlySigner() *x509.Certificate {
|
||||
if len(p7.Signers) != 1 {
|
||||
return nil
|
||||
}
|
||||
signer := p7.Signers[0]
|
||||
return getCertFromCertsByIssuerAndSerial(p7.Certificates, signer.IssuerAndSerialNumber)
|
||||
}
|
||||
|
||||
// ErrUnsupportedAlgorithm tells you when our quick dev assumptions have failed
|
||||
var ErrUnsupportedAlgorithm = errors.New("pkcs7: cannot decrypt data: only RSA, DES, DES-EDE3, AES-256-CBC and AES-128-GCM supported")
|
||||
|
||||
// ErrNotEncryptedContent is returned when attempting to Decrypt data that is not encrypted data
|
||||
var ErrNotEncryptedContent = errors.New("pkcs7: content data is a decryptable data type")
|
||||
|
||||
// Decrypt decrypts encrypted content info for recipient cert and private key
|
||||
func (p7 *PKCS7) Decrypt(cert *x509.Certificate, pk crypto.PrivateKey) ([]byte, error) {
|
||||
data, ok := p7.raw.(envelopedData)
|
||||
if !ok {
|
||||
return nil, ErrNotEncryptedContent
|
||||
}
|
||||
recipient := selectRecipientForCertificate(data.RecipientInfos, cert)
|
||||
if recipient.EncryptedKey == nil {
|
||||
return nil, errors.New("pkcs7: no enveloped recipient for provided certificate")
|
||||
}
|
||||
if priv := pk.(*rsa.PrivateKey); priv != nil {
|
||||
var contentKey []byte
|
||||
contentKey, err := rsa.DecryptPKCS1v15(rand.Reader, priv, recipient.EncryptedKey)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return data.EncryptedContentInfo.decrypt(contentKey)
|
||||
}
|
||||
fmt.Printf("Unsupported Private Key: %v\n", pk)
|
||||
return nil, ErrUnsupportedAlgorithm
|
||||
}
|
||||
|
||||
var oidEncryptionAlgorithmDESCBC = asn1.ObjectIdentifier{1, 3, 14, 3, 2, 7}
|
||||
var oidEncryptionAlgorithmDESEDE3CBC = asn1.ObjectIdentifier{1, 2, 840, 113549, 3, 7}
|
||||
var oidEncryptionAlgorithmAES256CBC = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 1, 42}
|
||||
var oidEncryptionAlgorithmAES128GCM = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 1, 6}
|
||||
var oidEncryptionAlgorithmAES128CBC = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 1, 2}
|
||||
|
||||
func (eci encryptedContentInfo) decrypt(key []byte) ([]byte, error) {
|
||||
alg := eci.ContentEncryptionAlgorithm.Algorithm
|
||||
if !alg.Equal(oidEncryptionAlgorithmDESCBC) &&
|
||||
!alg.Equal(oidEncryptionAlgorithmDESEDE3CBC) &&
|
||||
!alg.Equal(oidEncryptionAlgorithmAES256CBC) &&
|
||||
!alg.Equal(oidEncryptionAlgorithmAES128CBC) &&
|
||||
!alg.Equal(oidEncryptionAlgorithmAES128GCM) {
|
||||
fmt.Printf("Unsupported Content Encryption Algorithm: %s\n", alg)
|
||||
return nil, ErrUnsupportedAlgorithm
|
||||
}
|
||||
|
||||
// EncryptedContent can either be constructed of multple OCTET STRINGs
|
||||
// or _be_ a tagged OCTET STRING
|
||||
var cyphertext []byte
|
||||
if eci.EncryptedContent.IsCompound {
|
||||
// Complex case to concat all of the children OCTET STRINGs
|
||||
var buf bytes.Buffer
|
||||
cypherbytes := eci.EncryptedContent.Bytes
|
||||
for {
|
||||
var part []byte
|
||||
cypherbytes, _ = asn1.Unmarshal(cypherbytes, &part)
|
||||
buf.Write(part)
|
||||
if cypherbytes == nil {
|
||||
break
|
||||
}
|
||||
}
|
||||
cyphertext = buf.Bytes()
|
||||
} else {
|
||||
// Simple case, the bytes _are_ the cyphertext
|
||||
cyphertext = eci.EncryptedContent.Bytes
|
||||
}
|
||||
|
||||
var block cipher.Block
|
||||
var err error
|
||||
|
||||
switch {
|
||||
case alg.Equal(oidEncryptionAlgorithmDESCBC):
|
||||
block, err = des.NewCipher(key)
|
||||
case alg.Equal(oidEncryptionAlgorithmDESEDE3CBC):
|
||||
block, err = des.NewTripleDESCipher(key)
|
||||
case alg.Equal(oidEncryptionAlgorithmAES256CBC):
|
||||
fallthrough
|
||||
case alg.Equal(oidEncryptionAlgorithmAES128GCM), alg.Equal(oidEncryptionAlgorithmAES128CBC):
|
||||
block, err = aes.NewCipher(key)
|
||||
}
|
||||
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
if alg.Equal(oidEncryptionAlgorithmAES128GCM) {
|
||||
params := aesGCMParameters{}
|
||||
paramBytes := eci.ContentEncryptionAlgorithm.Parameters.Bytes
|
||||
|
||||
_, err := asn1.Unmarshal(paramBytes, ¶ms)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
gcm, err := cipher.NewGCM(block)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
if len(params.Nonce) != gcm.NonceSize() {
|
||||
return nil, errors.New("pkcs7: encryption algorithm parameters are incorrect")
|
||||
}
|
||||
if params.ICVLen != gcm.Overhead() {
|
||||
return nil, errors.New("pkcs7: encryption algorithm parameters are incorrect")
|
||||
}
|
||||
|
||||
plaintext, err := gcm.Open(nil, params.Nonce, cyphertext, nil)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
return plaintext, nil
|
||||
}
|
||||
|
||||
iv := eci.ContentEncryptionAlgorithm.Parameters.Bytes
|
||||
if len(iv) != block.BlockSize() {
|
||||
return nil, errors.New("pkcs7: encryption algorithm parameters are malformed")
|
||||
}
|
||||
mode := cipher.NewCBCDecrypter(block, iv)
|
||||
plaintext := make([]byte, len(cyphertext))
|
||||
mode.CryptBlocks(plaintext, cyphertext)
|
||||
if plaintext, err = unpad(plaintext, mode.BlockSize()); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return plaintext, nil
|
||||
}
|
||||
|
||||
func selectRecipientForCertificate(recipients []recipientInfo, cert *x509.Certificate) recipientInfo {
|
||||
for _, recp := range recipients {
|
||||
if isCertMatchForIssuerAndSerial(cert, recp.IssuerAndSerialNumber) {
|
||||
return recp
|
||||
}
|
||||
}
|
||||
return recipientInfo{}
|
||||
}
|
||||
|
||||
func isCertMatchForIssuerAndSerial(cert *x509.Certificate, ias issuerAndSerial) bool {
|
||||
return cert.SerialNumber.Cmp(ias.SerialNumber) == 0 && bytes.Compare(cert.RawIssuer, ias.IssuerName.FullBytes) == 0
|
||||
}
|
||||
|
||||
func pad(data []byte, blocklen int) ([]byte, error) {
|
||||
if blocklen < 1 {
|
||||
return nil, fmt.Errorf("invalid blocklen %d", blocklen)
|
||||
}
|
||||
padlen := blocklen - (len(data) % blocklen)
|
||||
if padlen == 0 {
|
||||
padlen = blocklen
|
||||
}
|
||||
pad := bytes.Repeat([]byte{byte(padlen)}, padlen)
|
||||
return append(data, pad...), nil
|
||||
}
|
||||
|
||||
func unpad(data []byte, blocklen int) ([]byte, error) {
|
||||
if blocklen < 1 {
|
||||
return nil, fmt.Errorf("invalid blocklen %d", blocklen)
|
||||
}
|
||||
if len(data)%blocklen != 0 || len(data) == 0 {
|
||||
return nil, fmt.Errorf("invalid data len %d", len(data))
|
||||
}
|
||||
|
||||
// the last byte is the length of padding
|
||||
padlen := int(data[len(data)-1])
|
||||
|
||||
// check padding integrity, all bytes should be the same
|
||||
pad := data[len(data)-padlen:]
|
||||
for _, padbyte := range pad {
|
||||
if padbyte != byte(padlen) {
|
||||
return nil, errors.New("invalid padding")
|
||||
}
|
||||
}
|
||||
|
||||
return data[:len(data)-padlen], nil
|
||||
}
|
||||
|
||||
func unmarshalAttribute(attrs []attribute, attributeType asn1.ObjectIdentifier, out interface{}) error {
|
||||
for _, attr := range attrs {
|
||||
if attr.Type.Equal(attributeType) {
|
||||
_, err := asn1.Unmarshal(attr.Value.Bytes, out)
|
||||
return err
|
||||
}
|
||||
}
|
||||
return errors.New("pkcs7: attribute type not in attributes")
|
||||
}
|
||||
|
||||
// UnmarshalSignedAttribute decodes a single attribute from the signer info
|
||||
func (p7 *PKCS7) UnmarshalSignedAttribute(attributeType asn1.ObjectIdentifier, out interface{}) error {
|
||||
sd, ok := p7.raw.(signedData)
|
||||
if !ok {
|
||||
return errors.New("pkcs7: payload is not signedData content")
|
||||
}
|
||||
if len(sd.SignerInfos) < 1 {
|
||||
return errors.New("pkcs7: payload has no signers")
|
||||
}
|
||||
attributes := sd.SignerInfos[0].AuthenticatedAttributes
|
||||
return unmarshalAttribute(attributes, attributeType, out)
|
||||
}
|
||||
|
||||
// SignedData is an opaque data structure for creating signed data payloads
|
||||
type SignedData struct {
|
||||
sd signedData
|
||||
certs []*x509.Certificate
|
||||
messageDigest []byte
|
||||
}
|
||||
|
||||
// Attribute represents a key value pair attribute. Value must be marshalable byte
|
||||
// `encoding/asn1`
|
||||
type Attribute struct {
|
||||
Type asn1.ObjectIdentifier
|
||||
Value interface{}
|
||||
}
|
||||
|
||||
// SignerInfoConfig are optional values to include when adding a signer
|
||||
type SignerInfoConfig struct {
|
||||
ExtraSignedAttributes []Attribute
|
||||
}
|
||||
|
||||
// NewSignedData initializes a SignedData with content
|
||||
func NewSignedData(data []byte) (*SignedData, error) {
|
||||
content, err := asn1.Marshal(data)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
ci := contentInfo{
|
||||
ContentType: oidData,
|
||||
Content: asn1.RawValue{Class: 2, Tag: 0, Bytes: content, IsCompound: true},
|
||||
}
|
||||
digAlg := pkix.AlgorithmIdentifier{
|
||||
Algorithm: oidDigestAlgorithmSHA1,
|
||||
}
|
||||
h := crypto.SHA1.New()
|
||||
h.Write(data)
|
||||
md := h.Sum(nil)
|
||||
sd := signedData{
|
||||
ContentInfo: ci,
|
||||
Version: 1,
|
||||
DigestAlgorithmIdentifiers: []pkix.AlgorithmIdentifier{digAlg},
|
||||
}
|
||||
return &SignedData{sd: sd, messageDigest: md}, nil
|
||||
}
|
||||
|
||||
type attributes struct {
|
||||
types []asn1.ObjectIdentifier
|
||||
values []interface{}
|
||||
}
|
||||
|
||||
// Add adds the attribute, maintaining insertion order
|
||||
func (attrs *attributes) Add(attrType asn1.ObjectIdentifier, value interface{}) {
|
||||
attrs.types = append(attrs.types, attrType)
|
||||
attrs.values = append(attrs.values, value)
|
||||
}
|
||||
|
||||
type sortableAttribute struct {
|
||||
SortKey []byte
|
||||
Attribute attribute
|
||||
}
|
||||
|
||||
type attributeSet []sortableAttribute
|
||||
|
||||
func (sa attributeSet) Len() int {
|
||||
return len(sa)
|
||||
}
|
||||
|
||||
func (sa attributeSet) Less(i, j int) bool {
|
||||
return bytes.Compare(sa[i].SortKey, sa[j].SortKey) < 0
|
||||
}
|
||||
|
||||
func (sa attributeSet) Swap(i, j int) {
|
||||
sa[i], sa[j] = sa[j], sa[i]
|
||||
}
|
||||
|
||||
func (sa attributeSet) Attributes() []attribute {
|
||||
attrs := make([]attribute, len(sa))
|
||||
for i, attr := range sa {
|
||||
attrs[i] = attr.Attribute
|
||||
}
|
||||
return attrs
|
||||
}
|
||||
|
||||
func (attrs *attributes) ForMarshaling() ([]attribute, error) {
|
||||
sortables := make(attributeSet, len(attrs.types))
|
||||
for i := range sortables {
|
||||
attrType := attrs.types[i]
|
||||
attrValue := attrs.values[i]
|
||||
asn1Value, err := asn1.Marshal(attrValue)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
attr := attribute{
|
||||
Type: attrType,
|
||||
Value: asn1.RawValue{Tag: 17, IsCompound: true, Bytes: asn1Value}, // 17 == SET tag
|
||||
}
|
||||
encoded, err := asn1.Marshal(attr)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
sortables[i] = sortableAttribute{
|
||||
SortKey: encoded,
|
||||
Attribute: attr,
|
||||
}
|
||||
}
|
||||
sort.Sort(sortables)
|
||||
return sortables.Attributes(), nil
|
||||
}
|
||||
|
||||
// AddSigner signs attributes about the content and adds certificate to payload
|
||||
func (sd *SignedData) AddSigner(cert *x509.Certificate, pkey crypto.PrivateKey, config SignerInfoConfig) error {
|
||||
attrs := &attributes{}
|
||||
attrs.Add(oidAttributeContentType, sd.sd.ContentInfo.ContentType)
|
||||
attrs.Add(oidAttributeMessageDigest, sd.messageDigest)
|
||||
attrs.Add(oidAttributeSigningTime, time.Now())
|
||||
for _, attr := range config.ExtraSignedAttributes {
|
||||
attrs.Add(attr.Type, attr.Value)
|
||||
}
|
||||
finalAttrs, err := attrs.ForMarshaling()
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
signature, err := signAttributes(finalAttrs, pkey, crypto.SHA1)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
ias, err := cert2issuerAndSerial(cert)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
signer := signerInfo{
|
||||
AuthenticatedAttributes: finalAttrs,
|
||||
DigestAlgorithm: pkix.AlgorithmIdentifier{Algorithm: oidDigestAlgorithmSHA1},
|
||||
DigestEncryptionAlgorithm: pkix.AlgorithmIdentifier{Algorithm: oidSignatureSHA1WithRSA},
|
||||
IssuerAndSerialNumber: ias,
|
||||
EncryptedDigest: signature,
|
||||
Version: 1,
|
||||
}
|
||||
// create signature of signed attributes
|
||||
sd.certs = append(sd.certs, cert)
|
||||
sd.sd.SignerInfos = append(sd.sd.SignerInfos, signer)
|
||||
return nil
|
||||
}
|
||||
|
||||
// AddCertificate adds the certificate to the payload. Useful for parent certificates
|
||||
func (sd *SignedData) AddCertificate(cert *x509.Certificate) {
|
||||
sd.certs = append(sd.certs, cert)
|
||||
}
|
||||
|
||||
// Detach removes content from the signed data struct to make it a detached signature.
|
||||
// This must be called right before Finish()
|
||||
func (sd *SignedData) Detach() {
|
||||
sd.sd.ContentInfo = contentInfo{ContentType: oidData}
|
||||
}
|
||||
|
||||
// Finish marshals the content and its signers
|
||||
func (sd *SignedData) Finish() ([]byte, error) {
|
||||
sd.sd.Certificates = marshalCertificates(sd.certs)
|
||||
inner, err := asn1.Marshal(sd.sd)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
outer := contentInfo{
|
||||
ContentType: oidSignedData,
|
||||
Content: asn1.RawValue{Class: 2, Tag: 0, Bytes: inner, IsCompound: true},
|
||||
}
|
||||
return asn1.Marshal(outer)
|
||||
}
|
||||
|
||||
func cert2issuerAndSerial(cert *x509.Certificate) (issuerAndSerial, error) {
|
||||
var ias issuerAndSerial
|
||||
// The issuer RDNSequence has to match exactly the sequence in the certificate
|
||||
// We cannot use cert.Issuer.ToRDNSequence() here since it mangles the sequence
|
||||
ias.IssuerName = asn1.RawValue{FullBytes: cert.RawIssuer}
|
||||
ias.SerialNumber = cert.SerialNumber
|
||||
|
||||
return ias, nil
|
||||
}
|
||||
|
||||
// signs the DER encoded form of the attributes with the private key
|
||||
func signAttributes(attrs []attribute, pkey crypto.PrivateKey, hash crypto.Hash) ([]byte, error) {
|
||||
attrBytes, err := marshalAttributes(attrs)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
h := hash.New()
|
||||
h.Write(attrBytes)
|
||||
hashed := h.Sum(nil)
|
||||
switch priv := pkey.(type) {
|
||||
case *rsa.PrivateKey:
|
||||
return rsa.SignPKCS1v15(rand.Reader, priv, crypto.SHA1, hashed)
|
||||
}
|
||||
return nil, ErrUnsupportedAlgorithm
|
||||
}
|
||||
|
||||
// concats and wraps the certificates in the RawValue structure
|
||||
func marshalCertificates(certs []*x509.Certificate) rawCertificates {
|
||||
var buf bytes.Buffer
|
||||
for _, cert := range certs {
|
||||
buf.Write(cert.Raw)
|
||||
}
|
||||
rawCerts, _ := marshalCertificateBytes(buf.Bytes())
|
||||
return rawCerts
|
||||
}
|
||||
|
||||
// Even though, the tag & length are stripped out during marshalling the
|
||||
// RawContent, we have to encode it into the RawContent. If its missing,
|
||||
// then `asn1.Marshal()` will strip out the certificate wrapper instead.
|
||||
func marshalCertificateBytes(certs []byte) (rawCertificates, error) {
|
||||
var val = asn1.RawValue{Bytes: certs, Class: 2, Tag: 0, IsCompound: true}
|
||||
b, err := asn1.Marshal(val)
|
||||
if err != nil {
|
||||
return rawCertificates{}, err
|
||||
}
|
||||
return rawCertificates{Raw: b}, nil
|
||||
}
|
||||
|
||||
// DegenerateCertificate creates a signed data structure containing only the
|
||||
// provided certificate or certificate chain.
|
||||
func DegenerateCertificate(cert []byte) ([]byte, error) {
|
||||
rawCert, err := marshalCertificateBytes(cert)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
emptyContent := contentInfo{ContentType: oidData}
|
||||
sd := signedData{
|
||||
Version: 1,
|
||||
ContentInfo: emptyContent,
|
||||
Certificates: rawCert,
|
||||
CRLs: []pkix.CertificateList{},
|
||||
}
|
||||
content, err := asn1.Marshal(sd)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
signedContent := contentInfo{
|
||||
ContentType: oidSignedData,
|
||||
Content: asn1.RawValue{Class: 2, Tag: 0, Bytes: content, IsCompound: true},
|
||||
}
|
||||
return asn1.Marshal(signedContent)
|
||||
}
|
||||
|
||||
const (
|
||||
EncryptionAlgorithmDESCBC = iota
|
||||
EncryptionAlgorithmAES128GCM
|
||||
)
|
||||
|
||||
// ContentEncryptionAlgorithm determines the algorithm used to encrypt the
|
||||
// plaintext message. Change the value of this variable to change which
|
||||
// algorithm is used in the Encrypt() function.
|
||||
var ContentEncryptionAlgorithm = EncryptionAlgorithmDESCBC
|
||||
|
||||
// ErrUnsupportedEncryptionAlgorithm is returned when attempting to encrypt
|
||||
// content with an unsupported algorithm.
|
||||
var ErrUnsupportedEncryptionAlgorithm = errors.New("pkcs7: cannot encrypt content: only DES-CBC and AES-128-GCM supported")
|
||||
|
||||
const nonceSize = 12
|
||||
|
||||
type aesGCMParameters struct {
|
||||
Nonce []byte `asn1:"tag:4"`
|
||||
ICVLen int
|
||||
}
|
||||
|
||||
func encryptAES128GCM(content []byte) ([]byte, *encryptedContentInfo, error) {
|
||||
// Create AES key and nonce
|
||||
key := make([]byte, 16)
|
||||
nonce := make([]byte, nonceSize)
|
||||
|
||||
_, err := rand.Read(key)
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
|
||||
_, err = rand.Read(nonce)
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
|
||||
// Encrypt content
|
||||
block, err := aes.NewCipher(key)
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
|
||||
gcm, err := cipher.NewGCM(block)
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
|
||||
ciphertext := gcm.Seal(nil, nonce, content, nil)
|
||||
|
||||
// Prepare ASN.1 Encrypted Content Info
|
||||
paramSeq := aesGCMParameters{
|
||||
Nonce: nonce,
|
||||
ICVLen: gcm.Overhead(),
|
||||
}
|
||||
|
||||
paramBytes, err := asn1.Marshal(paramSeq)
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
|
||||
eci := encryptedContentInfo{
|
||||
ContentType: oidData,
|
||||
ContentEncryptionAlgorithm: pkix.AlgorithmIdentifier{
|
||||
Algorithm: oidEncryptionAlgorithmAES128GCM,
|
||||
Parameters: asn1.RawValue{
|
||||
Tag: asn1.TagSequence,
|
||||
Bytes: paramBytes,
|
||||
},
|
||||
},
|
||||
EncryptedContent: marshalEncryptedContent(ciphertext),
|
||||
}
|
||||
|
||||
return key, &eci, nil
|
||||
}
|
||||
|
||||
func encryptDESCBC(content []byte) ([]byte, *encryptedContentInfo, error) {
|
||||
// Create DES key & CBC IV
|
||||
key := make([]byte, 8)
|
||||
iv := make([]byte, des.BlockSize)
|
||||
_, err := rand.Read(key)
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
_, err = rand.Read(iv)
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
|
||||
// Encrypt padded content
|
||||
block, err := des.NewCipher(key)
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
mode := cipher.NewCBCEncrypter(block, iv)
|
||||
plaintext, err := pad(content, mode.BlockSize())
|
||||
cyphertext := make([]byte, len(plaintext))
|
||||
mode.CryptBlocks(cyphertext, plaintext)
|
||||
|
||||
// Prepare ASN.1 Encrypted Content Info
|
||||
eci := encryptedContentInfo{
|
||||
ContentType: oidData,
|
||||
ContentEncryptionAlgorithm: pkix.AlgorithmIdentifier{
|
||||
Algorithm: oidEncryptionAlgorithmDESCBC,
|
||||
Parameters: asn1.RawValue{Tag: 4, Bytes: iv},
|
||||
},
|
||||
EncryptedContent: marshalEncryptedContent(cyphertext),
|
||||
}
|
||||
|
||||
return key, &eci, nil
|
||||
}
|
||||
|
||||
// Encrypt creates and returns an envelope data PKCS7 structure with encrypted
|
||||
// recipient keys for each recipient public key.
|
||||
//
|
||||
// The algorithm used to perform encryption is determined by the current value
|
||||
// of the global ContentEncryptionAlgorithm package variable. By default, the
|
||||
// value is EncryptionAlgorithmDESCBC. To use a different algorithm, change the
|
||||
// value before calling Encrypt(). For example:
|
||||
//
|
||||
// ContentEncryptionAlgorithm = EncryptionAlgorithmAES128GCM
|
||||
//
|
||||
// TODO(fullsailor): Add support for encrypting content with other algorithms
|
||||
func Encrypt(content []byte, recipients []*x509.Certificate) ([]byte, error) {
|
||||
var eci *encryptedContentInfo
|
||||
var key []byte
|
||||
var err error
|
||||
|
||||
// Apply chosen symmetric encryption method
|
||||
switch ContentEncryptionAlgorithm {
|
||||
case EncryptionAlgorithmDESCBC:
|
||||
key, eci, err = encryptDESCBC(content)
|
||||
|
||||
case EncryptionAlgorithmAES128GCM:
|
||||
key, eci, err = encryptAES128GCM(content)
|
||||
|
||||
default:
|
||||
return nil, ErrUnsupportedEncryptionAlgorithm
|
||||
}
|
||||
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
// Prepare each recipient's encrypted cipher key
|
||||
recipientInfos := make([]recipientInfo, len(recipients))
|
||||
for i, recipient := range recipients {
|
||||
encrypted, err := encryptKey(key, recipient)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
ias, err := cert2issuerAndSerial(recipient)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
info := recipientInfo{
|
||||
Version: 0,
|
||||
IssuerAndSerialNumber: ias,
|
||||
KeyEncryptionAlgorithm: pkix.AlgorithmIdentifier{
|
||||
Algorithm: oidEncryptionAlgorithmRSA,
|
||||
},
|
||||
EncryptedKey: encrypted,
|
||||
}
|
||||
recipientInfos[i] = info
|
||||
}
|
||||
|
||||
// Prepare envelope content
|
||||
envelope := envelopedData{
|
||||
EncryptedContentInfo: *eci,
|
||||
Version: 0,
|
||||
RecipientInfos: recipientInfos,
|
||||
}
|
||||
innerContent, err := asn1.Marshal(envelope)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
// Prepare outer payload structure
|
||||
wrapper := contentInfo{
|
||||
ContentType: oidEnvelopedData,
|
||||
Content: asn1.RawValue{Class: 2, Tag: 0, IsCompound: true, Bytes: innerContent},
|
||||
}
|
||||
|
||||
return asn1.Marshal(wrapper)
|
||||
}
|
||||
|
||||
func marshalEncryptedContent(content []byte) asn1.RawValue {
|
||||
asn1Content, _ := asn1.Marshal(content)
|
||||
return asn1.RawValue{Tag: 0, Class: 2, Bytes: asn1Content, IsCompound: true}
|
||||
}
|
||||
|
||||
func encryptKey(key []byte, recipient *x509.Certificate) ([]byte, error) {
|
||||
if pub := recipient.PublicKey.(*rsa.PublicKey); pub != nil {
|
||||
return rsa.EncryptPKCS1v15(rand.Reader, pub, key)
|
||||
}
|
||||
return nil, ErrUnsupportedAlgorithm
|
||||
}
|
||||
133
vendor/github.com/fullsailor/pkcs7/x509.go
generated
vendored
133
vendor/github.com/fullsailor/pkcs7/x509.go
generated
vendored
@@ -1,133 +0,0 @@
|
||||
// Copyright 2009 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the go/golang LICENSE file.
|
||||
|
||||
package pkcs7
|
||||
|
||||
// These are private constants and functions from the crypto/x509 package that
|
||||
// are useful when dealing with signatures verified by x509 certificates
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"crypto"
|
||||
"crypto/x509"
|
||||
"crypto/x509/pkix"
|
||||
"encoding/asn1"
|
||||
)
|
||||
|
||||
var (
|
||||
oidSignatureMD2WithRSA = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 2}
|
||||
oidSignatureMD5WithRSA = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 4}
|
||||
oidSignatureSHA1WithRSA = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 5}
|
||||
oidSignatureSHA256WithRSA = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 11}
|
||||
oidSignatureSHA384WithRSA = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 12}
|
||||
oidSignatureSHA512WithRSA = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 13}
|
||||
oidSignatureRSAPSS = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 10}
|
||||
oidSignatureDSAWithSHA1 = asn1.ObjectIdentifier{1, 2, 840, 10040, 4, 3}
|
||||
oidSignatureDSAWithSHA256 = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 3, 2}
|
||||
oidSignatureECDSAWithSHA1 = asn1.ObjectIdentifier{1, 2, 840, 10045, 4, 1}
|
||||
oidSignatureECDSAWithSHA256 = asn1.ObjectIdentifier{1, 2, 840, 10045, 4, 3, 2}
|
||||
oidSignatureECDSAWithSHA384 = asn1.ObjectIdentifier{1, 2, 840, 10045, 4, 3, 3}
|
||||
oidSignatureECDSAWithSHA512 = asn1.ObjectIdentifier{1, 2, 840, 10045, 4, 3, 4}
|
||||
|
||||
oidSHA256 = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 2, 1}
|
||||
oidSHA384 = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 2, 2}
|
||||
oidSHA512 = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 2, 3}
|
||||
|
||||
oidMGF1 = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 8}
|
||||
|
||||
// oidISOSignatureSHA1WithRSA means the same as oidSignatureSHA1WithRSA
|
||||
// but it's specified by ISO. Microsoft's makecert.exe has been known
|
||||
// to produce certificates with this OID.
|
||||
oidISOSignatureSHA1WithRSA = asn1.ObjectIdentifier{1, 3, 14, 3, 2, 29}
|
||||
)
|
||||
|
||||
var signatureAlgorithmDetails = []struct {
|
||||
algo x509.SignatureAlgorithm
|
||||
name string
|
||||
oid asn1.ObjectIdentifier
|
||||
pubKeyAlgo x509.PublicKeyAlgorithm
|
||||
hash crypto.Hash
|
||||
}{
|
||||
{x509.MD2WithRSA, "MD2-RSA", oidSignatureMD2WithRSA, x509.RSA, crypto.Hash(0) /* no value for MD2 */},
|
||||
{x509.MD5WithRSA, "MD5-RSA", oidSignatureMD5WithRSA, x509.RSA, crypto.MD5},
|
||||
{x509.SHA1WithRSA, "SHA1-RSA", oidSignatureSHA1WithRSA, x509.RSA, crypto.SHA1},
|
||||
{x509.SHA1WithRSA, "SHA1-RSA", oidISOSignatureSHA1WithRSA, x509.RSA, crypto.SHA1},
|
||||
{x509.SHA256WithRSA, "SHA256-RSA", oidSignatureSHA256WithRSA, x509.RSA, crypto.SHA256},
|
||||
{x509.SHA384WithRSA, "SHA384-RSA", oidSignatureSHA384WithRSA, x509.RSA, crypto.SHA384},
|
||||
{x509.SHA512WithRSA, "SHA512-RSA", oidSignatureSHA512WithRSA, x509.RSA, crypto.SHA512},
|
||||
{x509.SHA256WithRSAPSS, "SHA256-RSAPSS", oidSignatureRSAPSS, x509.RSA, crypto.SHA256},
|
||||
{x509.SHA384WithRSAPSS, "SHA384-RSAPSS", oidSignatureRSAPSS, x509.RSA, crypto.SHA384},
|
||||
{x509.SHA512WithRSAPSS, "SHA512-RSAPSS", oidSignatureRSAPSS, x509.RSA, crypto.SHA512},
|
||||
{x509.DSAWithSHA1, "DSA-SHA1", oidSignatureDSAWithSHA1, x509.DSA, crypto.SHA1},
|
||||
{x509.DSAWithSHA256, "DSA-SHA256", oidSignatureDSAWithSHA256, x509.DSA, crypto.SHA256},
|
||||
{x509.ECDSAWithSHA1, "ECDSA-SHA1", oidSignatureECDSAWithSHA1, x509.ECDSA, crypto.SHA1},
|
||||
{x509.ECDSAWithSHA256, "ECDSA-SHA256", oidSignatureECDSAWithSHA256, x509.ECDSA, crypto.SHA256},
|
||||
{x509.ECDSAWithSHA384, "ECDSA-SHA384", oidSignatureECDSAWithSHA384, x509.ECDSA, crypto.SHA384},
|
||||
{x509.ECDSAWithSHA512, "ECDSA-SHA512", oidSignatureECDSAWithSHA512, x509.ECDSA, crypto.SHA512},
|
||||
}
|
||||
|
||||
// pssParameters reflects the parameters in an AlgorithmIdentifier that
|
||||
// specifies RSA PSS. See https://tools.ietf.org/html/rfc3447#appendix-A.2.3
|
||||
type pssParameters struct {
|
||||
// The following three fields are not marked as
|
||||
// optional because the default values specify SHA-1,
|
||||
// which is no longer suitable for use in signatures.
|
||||
Hash pkix.AlgorithmIdentifier `asn1:"explicit,tag:0"`
|
||||
MGF pkix.AlgorithmIdentifier `asn1:"explicit,tag:1"`
|
||||
SaltLength int `asn1:"explicit,tag:2"`
|
||||
TrailerField int `asn1:"optional,explicit,tag:3,default:1"`
|
||||
}
|
||||
|
||||
// asn1.NullBytes is not available prior to Go 1.9
|
||||
var nullBytes = []byte{5, 0}
|
||||
|
||||
func getSignatureAlgorithmFromAI(ai pkix.AlgorithmIdentifier) x509.SignatureAlgorithm {
|
||||
if !ai.Algorithm.Equal(oidSignatureRSAPSS) {
|
||||
for _, details := range signatureAlgorithmDetails {
|
||||
if ai.Algorithm.Equal(details.oid) {
|
||||
return details.algo
|
||||
}
|
||||
}
|
||||
return x509.UnknownSignatureAlgorithm
|
||||
}
|
||||
|
||||
// RSA PSS is special because it encodes important parameters
|
||||
// in the Parameters.
|
||||
|
||||
var params pssParameters
|
||||
if _, err := asn1.Unmarshal(ai.Parameters.FullBytes, ¶ms); err != nil {
|
||||
return x509.UnknownSignatureAlgorithm
|
||||
}
|
||||
|
||||
var mgf1HashFunc pkix.AlgorithmIdentifier
|
||||
if _, err := asn1.Unmarshal(params.MGF.Parameters.FullBytes, &mgf1HashFunc); err != nil {
|
||||
return x509.UnknownSignatureAlgorithm
|
||||
}
|
||||
|
||||
// PSS is greatly overburdened with options. This code forces
|
||||
// them into three buckets by requiring that the MGF1 hash
|
||||
// function always match the message hash function (as
|
||||
// recommended in
|
||||
// https://tools.ietf.org/html/rfc3447#section-8.1), that the
|
||||
// salt length matches the hash length, and that the trailer
|
||||
// field has the default value.
|
||||
if !bytes.Equal(params.Hash.Parameters.FullBytes, nullBytes) ||
|
||||
!params.MGF.Algorithm.Equal(oidMGF1) ||
|
||||
!mgf1HashFunc.Algorithm.Equal(params.Hash.Algorithm) ||
|
||||
!bytes.Equal(mgf1HashFunc.Parameters.FullBytes, nullBytes) ||
|
||||
params.TrailerField != 1 {
|
||||
return x509.UnknownSignatureAlgorithm
|
||||
}
|
||||
|
||||
switch {
|
||||
case params.Hash.Algorithm.Equal(oidSHA256) && params.SaltLength == 32:
|
||||
return x509.SHA256WithRSAPSS
|
||||
case params.Hash.Algorithm.Equal(oidSHA384) && params.SaltLength == 48:
|
||||
return x509.SHA384WithRSAPSS
|
||||
case params.Hash.Algorithm.Equal(oidSHA512) && params.SaltLength == 64:
|
||||
return x509.SHA512WithRSAPSS
|
||||
}
|
||||
|
||||
return x509.UnknownSignatureAlgorithm
|
||||
}
|
||||
Reference in New Issue
Block a user