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构建并部署到测试环境（无 SSH） / build-and-deploy (push) Successful in 8m26s
62 lines
2.2 KiB
Go
62 lines
2.2 KiB
Go
// Package wecom 提供企业微信外部系统 Adapter。
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package wecom
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/rand"
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"encoding/base64"
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"io"
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"github.com/break/junhong_cmp_fiber/pkg/errors"
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)
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var credentialAAD = []byte("junhong-wecom-credential-v1")
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// CredentialCipher 使用 AES-256-GCM 加解密企业微信敏感凭据。
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type CredentialCipher struct {
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aead cipher.AEAD
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}
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// NewCredentialCipher 从 32 字节 Base64 密钥创建凭据加密器。
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func NewCredentialCipher(encodedKey string) (*CredentialCipher, error) {
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key, err := base64.StdEncoding.DecodeString(encodedKey)
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if err != nil || len(key) != 32 {
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return nil, errors.New(errors.CodeWeComCredentialInvalid, "企业微信凭据加密密钥必须是 32 字节 Base64")
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}
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, errors.Wrap(errors.CodeWeComCredentialInvalid, err, "初始化企业微信凭据加密器失败")
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}
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aead, err := cipher.NewGCM(block)
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if err != nil {
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return nil, errors.Wrap(errors.CodeWeComCredentialInvalid, err, "初始化企业微信凭据加密模式失败")
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}
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return &CredentialCipher{aead: aead}, nil
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}
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// Encrypt 加密单个敏感凭据，返回 nonce 与密文组合。
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func (c *CredentialCipher) Encrypt(plaintext string) ([]byte, error) {
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if c == nil || c.aead == nil || plaintext == "" {
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return nil, errors.New(errors.CodeWeComCredentialInvalid)
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}
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nonce := make([]byte, c.aead.NonceSize())
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if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
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return nil, errors.Wrap(errors.CodeInternalError, err, "生成企业微信凭据随机数失败")
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}
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return c.aead.Seal(nonce, nonce, []byte(plaintext), credentialAAD), nil
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}
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// Decrypt 解密单个企业微信敏感凭据。
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func (c *CredentialCipher) Decrypt(ciphertext []byte) (string, error) {
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if c == nil || c.aead == nil || len(ciphertext) <= c.aead.NonceSize() {
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return "", errors.New(errors.CodeWeComCredentialInvalid)
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}
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nonce := ciphertext[:c.aead.NonceSize()]
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plaintext, err := c.aead.Open(nil, nonce, ciphertext[c.aead.NonceSize():], credentialAAD)
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if err != nil {
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return "", errors.Wrap(errors.CodeWeComCredentialInvalid, err, "解密企业微信凭据失败")
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}
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return string(plaintext), nil
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}
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