51 lines
1.1 KiB
Go
51 lines
1.1 KiB
Go
package Vclaim
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/sha256"
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"encoding/base64"
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"errors"
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"bridging-rssa/docs"
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lzstring "github.com/daku10/go-lz-string"
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)
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func ResponseVclaim(encrypted string, key string) (string, error) {
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cipherText, err := base64.StdEncoding.DecodeString(encrypted)
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if err != nil {
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return "", err
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}
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hash := sha256.Sum256([]byte(key))
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block, err := aes.NewCipher(hash[:])
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if err != nil {
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return "", err
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}
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if len(cipherText) < aes.BlockSize {
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return "", errors.New("cipherText too short")
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}
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iv := hash[:aes.BlockSize]
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if len(cipherText)%aes.BlockSize != 0 {
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return "", errors.New("cipherText is not a multiple of the block size")
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}
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mode := cipher.NewCBCDecrypter(block, iv)
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mode.CryptBlocks(cipherText, cipherText)
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// cipherText, _ = pkcs7.Unpad(cipherText, aes.BlockSize)
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cipherText = docs.RemovePKCS7Padding(cipherText)
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data, err := lzstring.DecompressFromEncodedURIComponent(string(cipherText))
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// data, err := helper.DecompressFromEncodedUriComponent(string(cipherText))
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if err != nil {
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return "", err
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}
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return data, nil
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}
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