/// <summary>
/// Reads a key from the specified stream.
/// </summary>
/// <param name="stream">The stream.</param>
/// <returns>
/// The RSA Parameters of the key.
/// </returns>
/// <exception cref="System.ArgumentException">
/// Unexpected format.
/// or
/// Unexpected format.
/// or
/// Unexpected algorithm.
/// or
/// Unexpected format.
/// </exception>
protected override RSAParameters ReadCore(Stream stream)
{
var sequence = stream.ReadAsn1Elements().First();
if (sequence.Class != Asn.BerClass.Universal || sequence.PC != Asn.BerPC.Constructed || sequence.Tag != Asn.BerTag.Sequence)
{
throw new ArgumentException("Unexpected format.");
}
var elements = Asn.ReadAsn1Elements(sequence.Content).ToList();
if (elements.Count != 2 || elements[0].Class != Asn.BerClass.Universal || elements[0].PC != Asn.BerPC.Constructed || elements[0].Tag != Asn.BerTag.Sequence)
{
throw new ArgumentException("Unexpected format.");
}
var oid = Asn.ReadAsn1Elements(elements[0].Content).First();
if (!KeyFormatter.BufferEqual(Pkcs1KeyFormatter.RsaEncryptionObjectIdentifier, oid.Content))
{
throw new ArgumentException("Unexpected algorithm.");
}
if (elements[1].Class != Asn.BerClass.Universal || elements[1].PC != Asn.BerPC.Primitive || elements[1].Tag != Asn.BerTag.BitString || elements[1].Content[0] != 0)
{
throw new ArgumentException("Unexpected format.");
}
byte[] rsaPublicKey = TrimLeadingZero(elements[1].Content);
return(KeyFormatter.PublicKeyFilter(KeyFormatter.Pkcs1.Read(rsaPublicKey)));
}
/// <summary>
/// Reads a key from the specified stream.
/// </summary>
/// <param name="stream">The stream.</param>
/// <returns>
/// The RSA Parameters of the key.
/// </returns>
protected override RSAParameters ReadCore(Stream stream)
{
var universalConstructedSequence = stream.ReadAsn1Elements().Single();
var sequence = Asn.ReadAsn1Elements(universalConstructedSequence.Content).ToList();
KeyFormatter.VerifyFormat(sequence[0].Content.Length == 1 && sequence[0].Content[0] == 0x00, Strings.UnrecognizedVersion);
Asn.DataElement oid = Asn.ReadAsn1Elements(sequence[1].Content).First();
KeyFormatter.VerifyFormat(X509SubjectPublicKeyInfoFormatter.BufferEqual(oid.Content, Pkcs1KeyFormatter.RsaEncryptionObjectIdentifier), Strings.UnrecognizedObjectIdentifier);
return(KeyFormatter.Pkcs1.Read(sequence[2].Content));
}
/// <summary>
/// Reads a key from the specified stream.
/// </summary>
/// <param name="stream">The stream.</param>
/// <returns>
/// The RSA Parameters of the key.
/// </returns>
protected override RSAParameters ReadCore(Stream stream)
{
var keyBlobElement = Asn.ReadAsn1Elements(stream).First();
KeyFormatter.VerifyFormat(
keyBlobElement.Class == Asn.BerClass.Universal &&
keyBlobElement.PC == Asn.BerPC.Constructed &&
keyBlobElement.Tag == Asn.BerTag.Sequence);
stream = new MemoryStream(keyBlobElement.Content);
var sequence = Asn.ReadAsn1Elements(stream).ToList();
switch (sequence.Count)
{
case 2:
return(new RSAParameters
{
Modulus = sequence[0].Content,
Exponent = sequence[1].Content,
});
case 9:
KeyFormatter.VerifyFormat(sequence[0].Content.Length == 1 && sequence[0].Content[0] == 0, "Unsupported version.");
return(new RSAParameters
{
Modulus = sequence[1].Content,
Exponent = sequence[2].Content,
D = sequence[3].Content,
P = sequence[4].Content,
Q = sequence[5].Content,
DP = sequence[6].Content,
DQ = sequence[7].Content,
InverseQ = sequence[8].Content,
});
default:
throw KeyFormatter.FailFormat();
}
}