我需要从PHP到C#客户端(Mono,在各种平台上)为AES加密的base64编码文件提供服务。我已经成功地获得了AES加密/解密的正常工作,但只要我尝试base64编码/解码就会遇到麻烦。下面的例子都禁用了AES,所以这不应该是一个因素。在PHP和C之间解码base64文件内容#
我简单的测试案例,一个Hello World字符串,做工精细:
PHP服务输出 -
// Save encoded data to file
$data = base64_encode("Hello encryption world!!");
$file = fopen($targetPath, 'w');
fwrite($file, $data);
fclose($file);
// Later on, serve the file
header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: private",false);
header("Content-Type: application/octet-stream");
header("Content-Disposition: attachment; filename=".basename($product->PackageFilename($packageId)));
header("Content-Transfer-Encoding: binary");
header("Content-Length: ".filesize($targetPath));
ob_clean();
flush();
$handle = fopen($targetPath, "r");
fpassthru($handle);
fclose($handle);
C#解码和using-
StreamReader reader = new StreamReader(stream);
char[] buffer = DecodeBuffer;
string decoded = "";
int read = 0;
while (0 < (read = reader.Read(buffer, 0, DecodeBufferSize)))
{
byte[] decodedBytes = Convert.FromBase64CharArray(buffer, 0, read);
decoded += System.Text.Encoding.UTF8.GetString(decodedBytes);
}
Log(decoded); // Correctly logs "Hello encryption world!!"
然而,一旦我开始尝试对文件的内容做同样的事情,FormatException:找到无效字符由Convert.FromBase64CharArray引发:
PHP服务输出 -
// Save encoded data to file
$data = base64_encode(file_get_contents($targetPath));
$file = fopen($targetPath, 'w');
fwrite($file, $data);
fclose($file);
// Later on, serve the file
// Same as above
C#解码和using-
using (Stream file = File.Open(zipPath, FileMode.Create))
{
using (StreamReader reader = new StreamReader(stream))
{
char[] buffer = DecodeBuffer;
byte[] decodedBytes;
int read = 0;
while (0 < (read = reader.Read(buffer, 0, DecodeBufferSize)))
{
// Throws FormatException: Invalid character found
decodedBytes = Convert.FromBase64CharArray(buffer, 0, read);
file.Write(decodedBytes, 0, decodedBytes.Length);
}
}
}
是否有某种额外的处理,应该在更大的数据来完成的base64为是有效的?用大的二进制数据做这种做法可能是不恰当的 - 如果是这样的话,你会如何防止字符不安全传输的潜在问题?
只是好奇。在你写fwrite后,php可以打开那个文件并且解码没有错误? – webbiedave 2012-04-09 16:46:09
你需要弄清楚它不喜欢哪个字符。我猜这可能是一个编码问题。 – 2012-04-09 16:58:35
@webbiedave我不认为我检查了这一点。当我再看一遍时,我会的。 – FlintZA 2012-05-10 09:26:10