forked from golang/hotime
44 lines
1.2 KiB
Go
44 lines
1.2 KiB
Go
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package util
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import (
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"crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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"encoding/base64"
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"encoding/pem"
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"errors"
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"fmt"
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)
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// RSADecrypt 数据解密
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func RSADecrypt(privateKey string, ciphertext []byte) ([]byte, error) {
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block, _ := pem.Decode([]byte(privateKey))
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if block == nil {
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return nil, errors.New("PrivateKey format error")
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}
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priv, err := x509.ParsePKCS1PrivateKey(block.Bytes)
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if err != nil {
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oldErr := err
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key, err := x509.ParsePKCS8PrivateKey(block.Bytes)
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if err != nil {
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return nil, fmt.Errorf("ParsePKCS1PrivateKey error: %s, ParsePKCS8PrivateKey error: %s", oldErr.Error(), err.Error())
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}
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switch t := key.(type) {
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case *rsa.PrivateKey:
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priv = key.(*rsa.PrivateKey)
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default:
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return nil, fmt.Errorf("ParsePKCS1PrivateKey error: %s, ParsePKCS8PrivateKey error: Not supported privatekey format, should be *rsa.PrivateKey, got %T", oldErr.Error(), t)
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}
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}
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return rsa.DecryptPKCS1v15(rand.Reader, priv, ciphertext)
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}
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// RSADecryptBase64 Base64解码后再次进行RSA解密
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func RSADecryptBase64(privateKey string, cryptoText string) ([]byte, error) {
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encryptedData, err := base64.StdEncoding.DecodeString(cryptoText)
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if err != nil {
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return nil, err
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}
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return RSADecrypt(privateKey, encryptedData)
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}
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