mirror of https://github.com/dapr/kit.git
108 lines
3.6 KiB
Go
108 lines
3.6 KiB
Go
/*
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Copyright 2022 The Dapr Authors
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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//nolint:nosnakecase
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package crypto
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import (
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"crypto"
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"crypto/rand"
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"crypto/rsa"
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"github.com/lestrrat-go/jwx/v2/jwk"
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)
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// SupportedAsymmetricAlgorithms returns the list of supported asymmetric encryption algorithms.
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// This is a subset of the algorithms defined in consts.go.
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func SupportedAsymmetricAlgorithms() []string {
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return []string{
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Algorithm_RSA1_5,
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Algorithm_RSA_OAEP,
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Algorithm_RSA_OAEP_256, Algorithm_RSA_OAEP_384, Algorithm_RSA_OAEP_512,
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}
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}
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// EncryptPublicKey encrypts a message using a public key and the specified algorithm.
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// Note that "associatedData" is ignored if the cipher does not support labels/AAD.
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func EncryptPublicKey(plaintext []byte, algorithm string, key jwk.Key, associatedData []byte) (ciphertext []byte, err error) {
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// Ensure we are using a public key
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key, err = key.PublicKey()
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if err != nil {
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return nil, ErrKeyTypeMismatch
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}
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switch algorithm {
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case Algorithm_RSA1_5:
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return encryptPublicKeyRSAPKCS1v15(plaintext, key)
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case Algorithm_RSA_OAEP:
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return encryptPublicKeyRSAOAEP(plaintext, key, crypto.SHA1, associatedData)
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case Algorithm_RSA_OAEP_256, Algorithm_RSA_OAEP_384, Algorithm_RSA_OAEP_512:
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return encryptPublicKeyRSAOAEP(plaintext, key, getSHAHash(algorithm), associatedData)
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default:
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return nil, ErrUnsupportedAlgorithm
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}
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}
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func encryptPublicKeyRSAPKCS1v15(plaintext []byte, key jwk.Key) ([]byte, error) {
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rsaKey := &rsa.PublicKey{}
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if key.Raw(rsaKey) != nil {
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return nil, ErrKeyTypeMismatch
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}
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return rsa.EncryptPKCS1v15(rand.Reader, rsaKey, plaintext)
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}
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func encryptPublicKeyRSAOAEP(plaintext []byte, key jwk.Key, hash crypto.Hash, label []byte) ([]byte, error) {
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rsaKey := &rsa.PublicKey{}
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if key.Raw(rsaKey) != nil {
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return nil, ErrKeyTypeMismatch
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}
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return rsa.EncryptOAEP(hash.New(), rand.Reader, rsaKey, plaintext, label)
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}
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// DecryptPrivateKey decrypts a message using a private key and the specified algorithm.
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// Note that "associatedData" is ignored if the cipher does not support labels/AAD.
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func DecryptPrivateKey(ciphertext []byte, algorithm string, key jwk.Key, associatedData []byte) (plaintext []byte, err error) {
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switch algorithm {
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case Algorithm_RSA1_5:
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return decryptPrivateKeyRSAPKCS1v15(ciphertext, key)
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case Algorithm_RSA_OAEP:
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return decryptPrivateKeyRSAOAEP(ciphertext, key, crypto.SHA1, associatedData)
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case Algorithm_RSA_OAEP_256, Algorithm_RSA_OAEP_384, Algorithm_RSA_OAEP_512:
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return decryptPrivateKeyRSAOAEP(ciphertext, key, getSHAHash(algorithm), associatedData)
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default:
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return nil, ErrUnsupportedAlgorithm
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}
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}
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func decryptPrivateKeyRSAPKCS1v15(ciphertext []byte, key jwk.Key) ([]byte, error) {
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rsaKey := &rsa.PrivateKey{}
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if key.Raw(rsaKey) != nil {
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return nil, ErrKeyTypeMismatch
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}
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return rsa.DecryptPKCS1v15(rand.Reader, rsaKey, ciphertext)
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}
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func decryptPrivateKeyRSAOAEP(ciphertext []byte, key jwk.Key, hash crypto.Hash, label []byte) ([]byte, error) {
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rsaKey := &rsa.PrivateKey{}
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if key.Raw(rsaKey) != nil {
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return nil, ErrKeyTypeMismatch
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}
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return rsa.DecryptOAEP(hash.New(), rand.Reader, rsaKey, ciphertext, label)
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}
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