public void Provide(IBundleVersionProviderContext context)
{
byte[] hash;
using (var sha256 = CryptographyAlgorithms.CreateSHA256())
hash = sha256.ComputeHash(context.Content);
context.Result = WebEncoders.Base64UrlEncode(hash);
}
private static string GetHashForFile(IFileInfo fileInfo)
{
using (var sha256 = CryptographyAlgorithms.CreateSHA256()) {
using (var readStream = fileInfo.CreateReadStream()) {
var hash = sha256.ComputeHash(readStream);
return(WebEncoders.Base64UrlEncode(hash));
}
}
}
private static string GenerateCookieSuffix(string applicationId)
{
using (var sha256 = CryptographyAlgorithms.CreateSHA256())
{
var hash = sha256.ComputeHash(Encoding.UTF8.GetBytes(applicationId));
var subHash = hash.Take(8).ToArray();
return(WebEncoders.Base64UrlEncode(subHash));
}
}
/// <summary>
/// Creates a hashed value of the key.
/// </summary>
/// <returns>A cryptographic hash of the key.</returns>
public string GenerateHashedKey()
{
var key = GenerateKey();
// The key is typically too long to be useful, so we use a cryptographic hash
// as the actual key (better randomization and key distribution, so small vary
// values will generate dramatically different keys).
using (var sha256 = CryptographyAlgorithms.CreateSHA256())
{
var contentBytes = Encoding.UTF8.GetBytes(key);
var hashedBytes = sha256.ComputeHash(contentBytes);
return(Convert.ToBase64String(hashedBytes));
}
}
