/// <summary>
/// Signs one chunk of a request when transferring a payload using multiple chunks
/// </summary>
/// <param name="chunkBody">Content of the current chunk to sign</param>
/// <param name="previousSignature">Signature of the previously signed chunk</param>
/// <param name="headerSigningResult">Signing result for the "seed" signature consisting of headers</param>
/// <returns>Signature of the current chunk</returns>
public string SignChunk(Stream chunkBody, string previousSignature, AWS4aSigningResult headerSigningResult)
{
var signingConfig = PrepareCRTSigningConfig(AwsSignatureType.HTTP_REQUEST_CHUNK, headerSigningResult);
signingConfig.SignedBodyHeader = AwsSignedBodyHeaderType.NONE;
// The previous signature may be padded with '*' up to 144 characters, which is used
// when actually sending a chunk but not when calculating the next chunk's signature.
previousSignature = previousSignature.TrimEnd('*');
var signingResult = AwsSigner.SignChunk(chunkBody, Encoding.UTF8.GetBytes(previousSignature), signingConfig);
return(Encoding.UTF8.GetString(signingResult.Get().Signature));
}