go_s-mime

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Published: Dec 21, 2018 License: MIT

README

S/MIME

This is a partial implementation of S/MIME 4.0 in golang.

It consists of the following packages

  • asn11 - ASN.1 marshalling and unmarshalling GoDoc
  • b64 - Pretty base64 encoding for S/MIME (basically just the PEM body) GoDoc
  • cms(cms/protocol)2 - Cryptographic Message Syntax rfc5652GoDoc GoDoc
  • mime - Parsing for mime/multipart messages needed for S/MIME GoDoc
  • oid3 - ASN.1 object identifiers and related crypto GoDoc
  • openssl - Shelled-out openssl for testing GoDoc
  • pki4 - Creates x.509 pki for testing GoDoc
  • smime Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 4.0 rfc5751-bis-12 GoDoc
  • timestamp5 - Time-Stamp Protocol (TSP) rfc3161 GoDoc

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. Also RSAES-OAEP and RSASSA-PSS is supported.

This is covered in

  • Cryptographic Message Syntax (CMS) Authenticated-Enveloped-Data Content Type rfc5083
  • Using ChaCha20-Poly1305 Authenticated Encryption in the Cryptographic Message Syntax (CMS) rfc8103
  • Using AES-CCM and AES-GCM Authenticated Encryption in the Cryptographic Message Syntax (CMS) rfc5084
  • Use of the RSASSA-PSS Signature Algorithm in Cryptographic Message Syntax (CMS) rfc4056
  • Use of the RSAES-OAEP Key Transport Algorithm in the Cryptographic Message Syntax (CMS) rfc3560

Examples

Encryption and decryption
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
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

  • Testing

Directories

Path Synopsis
Package asn1 implements parsing of DER-encoded ASN.1 data structures, as defined in ITU-T Rec X.690.
Package asn1 implements parsing of DER-encoded ASN.1 data structures, as defined in ITU-T Rec X.690.
Package b64 encodes base64 and does formating for S/MIME
Package b64 encodes base64 and does formating for S/MIME
cms
Package cms contains high level functions for cryptographic message syntax RFC 5652.
Package cms contains high level functions for cryptographic message syntax RFC 5652.
protocol
Package protocol implemets parts of cryptographic message syntax RFC 5652.
Package protocol implemets parts of cryptographic message syntax RFC 5652.
Package MIME implemets parsing of MIME and MIME/multipart messages needed to verfiy multipart/signed messages
Package MIME implemets parsing of MIME and MIME/multipart messages needed to verfiy multipart/signed messages
Package oid contains OIDs that are used by other packages in this repository.
Package oid contains OIDs that are used by other packages in this repository.
Package openssl shells out openssl for testing
Package openssl shells out openssl for testing
Package pki can create ca's intermediates and certificates
Package pki can create ca's intermediates and certificates
Package smime implants parts of the S/MIME 4.0 specification rfc5751-bis-12.
Package smime implants parts of the S/MIME 4.0 specification rfc5751-bis-12.
Package timestamp implements the timestamp protocol rfc 3161
Package timestamp implements the timestamp protocol rfc 3161

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