226 lines
6.6 KiB
Go
226 lines
6.6 KiB
Go
/*-
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* Copyright 2014 Square Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package jose
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import (
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"crypto/ecdsa"
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"crypto/rand"
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"crypto/rsa"
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"fmt"
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)
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// Dummy encrypter for use in examples
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var encrypter, _ = NewEncrypter(DIRECT, A128GCM, []byte{})
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func Example_jWE() {
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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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func Example_jWS() {
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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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func ExampleNewEncrypter_publicKey() {
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var publicKey *rsa.PublicKey
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// Instantiate an encrypter using RSA-OAEP with AES128-GCM.
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NewEncrypter(RSA_OAEP, A128GCM, publicKey)
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// Instantiate an encrypter using RSA-PKCS1v1.5 with AES128-CBC+HMAC.
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NewEncrypter(RSA1_5, A128CBC_HS256, publicKey)
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}
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func ExampleNewEncrypter_symmetric() {
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var sharedKey []byte
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// Instantiate an encrypter using AES128-GCM with AES-GCM key wrap.
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NewEncrypter(A128GCMKW, A128GCM, sharedKey)
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// Instantiate an encrypter using AES256-GCM directly, w/o key wrapping.
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NewEncrypter(DIRECT, A256GCM, sharedKey)
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}
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func ExampleNewSigner_publicKey() {
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var rsaPrivateKey *rsa.PrivateKey
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var ecdsaPrivateKey *ecdsa.PrivateKey
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// Instantiate a signer using RSA-PKCS#1v1.5 with SHA-256.
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NewSigner(RS256, rsaPrivateKey)
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// Instantiate a signer using ECDSA with SHA-384.
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NewSigner(ES384, ecdsaPrivateKey)
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}
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func ExampleNewSigner_symmetric() {
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var sharedKey []byte
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// Instantiate an signer using HMAC-SHA256.
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NewSigner(HS256, sharedKey)
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// Instantiate an signer using HMAC-SHA512.
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NewSigner(HS512, sharedKey)
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}
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func ExampleNewMultiEncrypter() {
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var publicKey *rsa.PublicKey
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var sharedKey []byte
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// Instantiate an encrypter using AES-GCM.
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encrypter, err := NewMultiEncrypter(A128GCM)
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if err != nil {
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panic(err)
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}
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// Add a recipient using a shared key with AES-GCM key wap
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err = encrypter.AddRecipient(A128GCMKW, sharedKey)
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if err != nil {
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panic(err)
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}
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// Add a recipient using an RSA public key with RSA-OAEP
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err = encrypter.AddRecipient(RSA_OAEP, publicKey)
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if err != nil {
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panic(err)
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}
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}
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func ExampleNewMultiSigner() {
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var privateKey *rsa.PrivateKey
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var sharedKey []byte
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// Instantiate a signer for multiple recipients.
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signer := NewMultiSigner()
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// Add a recipient using a shared key with HMAC-SHA256
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err := signer.AddRecipient(HS256, sharedKey)
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if err != nil {
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panic(err)
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}
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// Add a recipient using an RSA private key with RSASSA-PSS with SHA384
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err = signer.AddRecipient(PS384, privateKey)
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if err != nil {
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panic(err)
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}
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}
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func ExampleEncrypter_encrypt() {
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// Encrypt a plaintext in order to get an encrypted JWE object.
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var plaintext = []byte("This is a secret message")
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encrypter.Encrypt(plaintext)
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}
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func ExampleEncrypter_encryptWithAuthData() {
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// Encrypt a plaintext in order to get an encrypted JWE object. Also attach
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// some additional authenticated data (AAD) to the object. Note that objects
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// with attached AAD can only be represented using full serialization.
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var plaintext = []byte("This is a secret message")
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var aad = []byte("This is authenticated, but public data")
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encrypter.EncryptWithAuthData(plaintext, aad)
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}
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