188 lines
7.7 KiB
Markdown
188 lines
7.7 KiB
Markdown
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# Go JOSE
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[](https://godoc.org/github.com/square/go-jose) [](https://raw.githubusercontent.com/square/go-jose/master/LICENSE) [](https://travis-ci.org/square/go-jose) [](https://coveralls.io/r/square/go-jose)
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Package jose aims to provide an implementation of the Javascript Object Signing
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and Encryption set of standards. For the moment, it mainly focuses on encryption
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and signing based on the JSON Web Encryption and JSON Web Signature standards.
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**Disclaimer**: This library contains encryption software that is subject to
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the U.S. Export Administration Regulations. You may not export, re-export,
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transfer or download this code or any part of it in violation of any United
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States law, directive or regulation. In particular this software may not be
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exported or re-exported in any form or on any media to Iran, North Sudan,
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Syria, Cuba, or North Korea, or to denied persons or entities mentioned on any
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US maintained blocked list.
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## Overview
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The implementation follows the
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[JSON Web Encryption](http://dx.doi.org/10.17487/RFC7516)
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standard (RFC 7516) and
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[JSON Web Signature](http://dx.doi.org/10.17487/RFC7515)
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standard (RFC 7515). Tables of supported algorithms are shown below.
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The library supports both the compact and full serialization formats, and has
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optional support for multiple recipients. It also comes with a small
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command-line utility (`jose-util`) for encrypting/decrypting JWE messages in a
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shell.
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### Supported algorithms
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See below for a table of supported algorithms. Algorithm identifiers match
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the names in the
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[JSON Web Algorithms](http://dx.doi.org/10.17487/RFC7518)
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standard where possible. The
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[Godoc reference](https://godoc.org/github.com/square/go-jose#pkg-constants)
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has a list of constants.
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Key encryption | Algorithm identifier(s)
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:------------------------- | :------------------------------
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RSA-PKCS#1v1.5 | RSA1_5
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RSA-OAEP | RSA-OAEP, RSA-OAEP-256
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AES key wrap | A128KW, A192KW, A256KW
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AES-GCM key wrap | A128GCMKW, A192GCMKW, A256GCMKW
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ECDH-ES + AES key wrap | ECDH-ES+A128KW, ECDH-ES+A192KW, ECDH-ES+A256KW
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ECDH-ES (direct) | ECDH-ES<sup>1</sup>
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Direct encryption | dir<sup>1</sup>
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<sup>1. Not supported in multi-recipient mode</sup>
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Signing / MAC | Algorithm identifier(s)
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:------------------------- | :------------------------------
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RSASSA-PKCS#1v1.5 | RS256, RS384, RS512
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RSASSA-PSS | PS256, PS384, PS512
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HMAC | HS256, HS384, HS512
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ECDSA | ES256, ES384, ES512
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Content encryption | Algorithm identifier(s)
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:------------------------- | :------------------------------
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AES-CBC+HMAC | A128CBC-HS256, A192CBC-HS384, A256CBC-HS512
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AES-GCM | A128GCM, A192GCM, A256GCM
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Compression | Algorithm identifiers(s)
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:------------------------- | -------------------------------
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DEFLATE (RFC 1951) | DEF
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### Supported key types
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See below for a table of supported key types. These are understood by the
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library, and can be passed to corresponding functions such as `NewEncrypter` or
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`NewSigner`. Note that if you are creating a new encrypter or signer with a
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JsonWebKey, the key id of the JsonWebKey (if present) will be added to any
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resulting messages.
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Algorithm(s) | Corresponding types
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:------------------------- | -------------------------------
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RSA | *[rsa.PublicKey](http://golang.org/pkg/crypto/rsa/#PublicKey), *[rsa.PrivateKey](http://golang.org/pkg/crypto/rsa/#PrivateKey), *[jose.JsonWebKey](https://godoc.org/github.com/square/go-jose#JsonWebKey)
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ECDH, ECDSA | *[ecdsa.PublicKey](http://golang.org/pkg/crypto/ecdsa/#PublicKey), *[ecdsa.PrivateKey](http://golang.org/pkg/crypto/ecdsa/#PrivateKey), *[jose.JsonWebKey](https://godoc.org/github.com/square/go-jose#JsonWebKey)
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AES, HMAC | []byte, *[jose.JsonWebKey](https://godoc.org/github.com/square/go-jose#JsonWebKey)
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## Examples
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Encryption/decryption example using RSA:
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```Go
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// Generate a public/private key pair to use for this example. The library
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// also provides two utility functions (LoadPublicKey and LoadPrivateKey)
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// that can be used to load keys from PEM/DER-encoded data.
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privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
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if err != nil {
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panic(err)
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}
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// Instantiate an encrypter using RSA-OAEP with AES128-GCM. An error would
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// indicate that the selected algorithm(s) are not currently supported.
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publicKey := &privateKey.PublicKey
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encrypter, err := NewEncrypter(RSA_OAEP, A128GCM, publicKey)
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if err != nil {
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panic(err)
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}
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// Encrypt a sample plaintext. Calling the encrypter returns an encrypted
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// JWE object, which can then be serialized for output afterwards. An error
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// would indicate a problem in an underlying cryptographic primitive.
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var plaintext = []byte("Lorem ipsum dolor sit amet")
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object, err := encrypter.Encrypt(plaintext)
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if err != nil {
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panic(err)
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}
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// Serialize the encrypted object using the full serialization format.
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// Alternatively you can also use the compact format here by calling
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// object.CompactSerialize() instead.
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serialized := object.FullSerialize()
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// Parse the serialized, encrypted JWE object. An error would indicate that
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// the given input did not represent a valid message.
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object, err = ParseEncrypted(serialized)
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if err != nil {
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panic(err)
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}
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// Now we can decrypt and get back our original plaintext. An error here
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// would indicate the the message failed to decrypt, e.g. because the auth
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// tag was broken or the message was tampered with.
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decrypted, err := object.Decrypt(privateKey)
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if err != nil {
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panic(err)
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}
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fmt.Printf(string(decrypted))
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// output: Lorem ipsum dolor sit amet
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```
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Signing/verification example using RSA:
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```Go
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// Generate a public/private key pair to use for this example. The library
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// also provides two utility functions (LoadPublicKey and LoadPrivateKey)
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// that can be used to load keys from PEM/DER-encoded data.
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privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
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if err != nil {
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panic(err)
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}
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// Instantiate a signer using RSASSA-PSS (SHA512) with the given private key.
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signer, err := NewSigner(PS512, privateKey)
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if err != nil {
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panic(err)
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}
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// Sign a sample payload. Calling the signer returns a protected JWS object,
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// which can then be serialized for output afterwards. An error would
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// indicate a problem in an underlying cryptographic primitive.
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var payload = []byte("Lorem ipsum dolor sit amet")
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object, err := signer.Sign(payload)
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if err != nil {
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panic(err)
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}
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// Serialize the encrypted object using the full serialization format.
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// Alternatively you can also use the compact format here by calling
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// object.CompactSerialize() instead.
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serialized := object.FullSerialize()
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// Parse the serialized, protected JWS object. An error would indicate that
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// the given input did not represent a valid message.
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object, err = ParseSigned(serialized)
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if err != nil {
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panic(err)
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}
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// Now we can verify the signature on the payload. An error here would
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// indicate the the message failed to verify, e.g. because the signature was
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// broken or the message was tampered with.
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output, err := object.Verify(&privateKey.PublicKey)
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if err != nil {
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panic(err)
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}
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fmt.Printf(string(output))
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// output: Lorem ipsum dolor sit amet
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```
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More examples can be found in the [Godoc
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reference](https://godoc.org/github.com/square/go-jose) for this package. The
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`jose-util` subdirectory also contains a small command-line utility for
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encrypting/decrypting JWE messages which might be useful as an example.
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