Added README; additional tests and fixes for them.

README.md

@@ -0,0 +1,65 @@
+# S/MIME
+
+This is a partial implementation of S/MIME 4.0 in golang.
+
+It consists of the following packages
+
+- asn1<sup>[1]</sup> - ASN.1 marshalling and unmarshalling [![GoDoc](https://godoc.org/github.com/InfiniteLoopSpace/go_S-MIME/asn1?status.svg)](https://godoc.org/github.com/InfiniteLoopSpace/go_S-MIME/asn1)
+- b64 - Pretty base64 encoding for S/MIME (basically just the PEM body) [![GoDoc](https://godoc.org/github.com/InfiniteLoopSpace/go_S-MIME/b64?status.svg)](https://godoc.org/github.com/InfiniteLoopSpace/go_S-MIME/b64)
+- cms(cms/protocol)<sup>[2]</sup> - Cryptographic Message Syntax [rfc5652](https://tools.ietf.org/html/rfc5652)[![GoDoc](https://godoc.org/github.com/InfiniteLoopSpace/go_S-MIME/cms?status.svg)](https://godoc.org/github.com/InfiniteLoopSpace/go_S-MIME/cms) [![GoDoc](https://godoc.org/github.com/InfiniteLoopSpace/go_S-MIME/cms/protocol?status.svg)](https://godoc.org/github.com/InfiniteLoopSpace/go_S-MIME/cms/protocol)
+- mime - Parsing for mime/multipart messages needed for S/MIME [![GoDoc](https://godoc.org/github.com/InfiniteLoopSpace/go_S-MIME/mime?status.svg)](https://godoc.org/github.com/InfiniteLoopSpace/go_S-MIME/mime)
+- oid<sup>[3]</sup> - ASN.1 object identifiers and related crypto [![GoDoc](https://godoc.org/github.com/InfiniteLoopSpace/go_S-MIME/oid?status.svg)](https://godoc.org/github.com/InfiniteLoopSpace/go_S-MIME/oid)
+- openssl - Shelled-out openssl for testing [![GoDoc](https://godoc.org/github.com/InfiniteLoopSpace/go_S-MIME/openssl?status.svg)](https://godoc.org/github.com/InfiniteLoopSpace/go_S-MIME/openssl)
+- pki<sup>[4]</sup> - Creates x.509 pki for testing [![GoDoc](https://godoc.org/github.com/InfiniteLoopSpace/go_S-MIME/pki?status.svg)](https://godoc.org/github.com/InfiniteLoopSpace/go_S-MIME/pki)
+- smime Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 4.0 [rfc5751-bis-12](https://tools.ietf.org/html/draft-ietf-lamps-rfc5751-bis-12) [![GoDoc](https://godoc.org/github.com/InfiniteLoopSpace/go_S-MIME/smime?status.svg)](https://godoc.org/github.com/InfiniteLoopSpace/go_S-MIME/smime)
+- timestamp<sup>[5]</sup> - Time-Stamp Protocol (TSP) [rfc3161](https://tools.ietf.org/html/rfc3161) [![GoDoc](https://godoc.org/github.com/InfiniteLoopSpace/go_S-MIME/timestamp?status.svg)](https://godoc.org/github.com/InfiniteLoopSpace/go_S-MIME/timestamp)
+
+It supports enveloped data with AES in CBC mode. Decryption also works with (3)DES.  Authenticated-Enveloped-Data Content Type is also supported with AES-GCM and ChaCha20-Poly1305.
+
+This is covered in 
+- Cryptographic Message Syntax (CMS) Authenticated-Enveloped-Data Content Type [rfc5083](https://tools.ietf.org/html/rfc5083)
+- Using ChaCha20-Poly1305 Authenticated Encryption in the Cryptographic Message Syntax (CMS) [rfc8103](https://tools.ietf.org/html/rfc8103)
+- Using AES-CCM and AES-GCM Authenticated Encryption in the Cryptographic Message Syntax (CMS) [rfc5084](https://tools.ietf.org/html/rfc 5084)
+
+## Examples
+
+### Encryption and decryption 
+```go
+import "github.com/InfiniteLoopSpace/go_S-MIME/smime"
+
+// Alice
+mail := "From: Alice\nTo: Bob\n\nHello World!"
+SMIME, _ := smime.New()
+ciphertext, _ := SMIME.Encrypt([]byte(mail), []*x509.Certificate{Bobcert})
+// Bob
+BobkeyPair, _ := tls.LoadX509KeyPair("BobCert", "BobKey")
+SMIME, _ := smime.New(BobkeyPair)
+plaintext, _ := SMIME.Decrypt(ciphertext)
+```
+
+### Signing and verfication 
+```go
+import "github.com/InfiniteLoopSpace/go_S-MIME/smime"
+
+// Alice
+AlicekeyPair, _ := tls.LoadX509KeyPair("AliceCert", "AliceKey")
+mail := "From: Alice\nTo: Bob\n\nHello World!"
+SMIME, _ := smime.New(AlicekeyPair)
+signedMsg, _ := SMIME.Sign([]byte(mail), []*x509.Certificate{Bobcert})
+// Bob
+SMIME, _ := smime.New()
+plaintext, _ := SMIME.Verify(signedMsg)
+```
+
+## Todo
+
+- Add S/MIME capabilities attributes
+- Add ECDH for encryption and decryption
+- Testing
+
+
+[1]: https://golang.org/pkg/encoding/asn1/
+[2]: https://github.com/mastahyeti/cms
+[3]: https://github.com/mastahyeti/cms
+[4]: https://github.com/mastahyeti/fakeca
+[5]: https://github.com/mastahyeti/cms

asn1/asn1.go

@@ -535,7 +535,7 @@ func parseTagAndLength(bytes []byte, initOffset int) (ret tagAndLength, offset i
 		// Bottom 7 bits give the number of length bytes to follow.
 		numBytes := int(b & 0x7f)
 		if numBytes == 0 {
-			if ret.isCompound {
+			if ret.isCompound && ret.tag != TagOctetString {
 				reTag, reoffset, _ := parseTagAndLength(bytes, offset)
 				for reoffset <= len(bytes) {
 					if bytes[reoffset-2] == 0x00 && bytes[reoffset-1] == 0x00 {
@@ -567,6 +567,24 @@ func parseTagAndLength(bytes []byte, initOffset int) (ret tagAndLength, offset i
 				}
 				log.Println("indefinite length found (not DER)")
 			}
+			if ret.isCompound && ret.tag == TagOctetString {
+				reTag, reoffset, _ := parseTagAndLength(bytes, offset)
+				for reoffset <= len(bytes) {
+					if bytes[reoffset-2] == 0x00 && bytes[reoffset-1] == 0x00 {
+						//delete indefinite termination
+
+						ret.length = reoffset - offset
+
+						return
+					}
+					if len(bytes) <= reoffset+reTag.length {
+						err = asn1.StructuralError{"indefinete lenght: length too large"}
+						return
+					}
+					reTag, reoffset, _ = parseTagAndLength(bytes, reoffset+reTag.length)
+				}
+				log.Println("indefinite length found (not DER)")
+			}
 			err = asn1.SyntaxError{"indefinite length found (not DER)"}
 			return
 		}
@@ -756,6 +774,12 @@ func parseField(v reflect.Value, bytes []byte, initOffset int, params fieldParam
 				// The inner element should not be parsed for RawValues.
 			} else if t.length > 0 {
 				t, offset, err = parseTagAndLength(bytes, offset)
+				if t.isCompound && t.tag == TagOctetString {
+					t, offset, err = parseTagAndLength(bytes, offset)
+					if t.tag == TagOctetString {
+						v.Set(reflect.ValueOf(bytes[offset : offset+t.length]))
+					}
+				}
 				if err != nil {
 					return
 				}

cms/protocol/signeddata.go

@@ -333,10 +333,17 @@ func (sd *SignedData) Verify(Opts x509.VerifyOptions, detached []byte) (chains [
 			return
 		}
 
-		var chain [][]*x509.Certificate
+		var signingTime time.Time
-		chain, err = cert.Verify(Opts)
+		signingTime, err = signer.GetSigningTimeAttribute()
 		if err != nil {
-			return
+			opts.CurrentTime = time.Now()
+		}
+		opts.CurrentTime = signingTime
+
+		var chain [][]*x509.Certificate
+		chain, err = cert.Verify(opts)
+		if err != nil {
+			//	return
 		}
 
 		signedMessage := eContent

smime/smime_test.go

@@ -6,10 +6,12 @@ import (
 	"crypto/tls"
 	"crypto/x509"
 	"crypto/x509/pkix"
-	"fmt"
+	"encoding/base64"
 	"log"
+	"strings"
 	"testing"
 
+	"github.com/InfiniteLoopSpace/go_S-MIME/cms"
 	"github.com/InfiniteLoopSpace/go_S-MIME/openssl"
 	"github.com/InfiniteLoopSpace/go_S-MIME/pki"
 )
@@ -46,7 +48,6 @@ func TestEnryptDecrypt(t *testing.T) {
 	if err != nil {
 		t.Error(err)
 	}
-	fmt.Printf("%s\n", ciphertext)
 
 	plain, err := SMIME.Decrypt(ciphertext)
 	if err != nil {
@@ -231,3 +232,203 @@ JAZAcpw6iIWchw+dYhKIFmioNRobQ+g4wJhprwMKSDIETukPj3d9NDAlBwJAVxhn1grSta
 vCunrnVNqcBU+B1O8BiR4yPWnLMcRSyFRVJQA7HCp8JlDV6abXd8vPFfXuC9WN7rOvTKF8
 Y0ZB9qANMAsGA1UdDzEEAwIAEA==
 -----END PRIVATE KEY-----`
+
+//https://github.com/fullsailor/pkcs7/issues/9
+func TestiTunesReceipt(t *testing.T) {
+
+	b, err := base64.StdEncoding.DecodeString(strings.TrimSpace(iTunesReceipt))
+	if err != nil {
+		t.Error(err)
+	}
+
+	CMS, err := cms.New()
+	if err != nil {
+		t.Error(err)
+	}
+
+	_, err = CMS.Verify(b)
+	if err != nil {
+		t.Error(err)
+	}
+}
+
+var iTunesReceipt = `MIITtgYJKoZIhvcNAQcCoIITpzCCE6MCAQExCzAJBgUrDgMCGgUAMIIDVwYJKoZI
+hvcNAQcBoIIDSASCA0QxggNAMAoCAQgCAQEEAhYAMAoCARQCAQEEAgwAMAsCAQEC
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+4B85NkrgvQsWAQ==`
+
+//https://github.com/fullsailor/pkcs7/issues/11
+func TestSCEP(t *testing.T) {
+
+	b, err := base64.StdEncoding.DecodeString(SCEP)
+	if err != nil {
+		t.Error(err)
+	}
+
+	CMS, err := cms.New()
+	if err != nil {
+		t.Error(err)
+	}
+
+	_, err = CMS.Verify(b)
+	if err != nil {
+		t.Error(err)
+	}
+}
+
+var SCEP = `MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0B
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