/// <summary>
/// Initializes a new instance of the <see cref="CoseHeaderLabel"/> struct.
/// </summary>
/// <param name="label">The header label as a text string.</param>
/// <exception cref="ArgumentNullException"><paramref name="label"/> is <see langword="null"/>.</exception>
public CoseHeaderLabel(string label)
{
if (label is null)
{
throw new ArgumentNullException(nameof(label));
}
this = default;
LabelAsString = label;
EncodedSize = CoseHelpers.GetTextStringEncodedSize(label);
}
public bool VerifyEmbedded(AsymmetricAlgorithm key, byte[]?associatedData = null)
{
if (key is null)
{
throw new ArgumentNullException(nameof(key));
}
if (Message.IsDetached)
{
throw new InvalidOperationException(SR.ContentWasDetached);
}
return(VerifyCore(key, Message.Content.Value.Span, null, associatedData, CoseHelpers.GetKeyType(key)));
}
public bool VerifyDetached(AsymmetricAlgorithm key, ReadOnlySpan <byte> detachedContent, ReadOnlySpan <byte> associatedData = default)
{
if (key is null)
{
throw new ArgumentNullException(nameof(key));
}
if (!Message.IsDetached)
{
throw new InvalidOperationException(SR.ContentWasEmbedded);
}
return(VerifyCore(key, detachedContent, null, associatedData, CoseHelpers.GetKeyType(key)));
}
public CoseSigner(AsymmetricAlgorithm key, HashAlgorithmName hashAlgorithm, CoseHeaderMap?protectedHeaders = null, CoseHeaderMap?unprotectedHeaders = null)
{
if (key is null)
{
throw new ArgumentNullException(nameof(key));
}
if (key is RSA)
{
throw new CryptographicException(SR.CoseSignerRSAKeyNeedsPadding);
}
Key = key;
HashAlgorithm = hashAlgorithm;
_protectedHeaders = protectedHeaders;
_unprotectedHeaders = unprotectedHeaders;
_keyType = CoseHelpers.GetKeyType(key);
_algHeaderValueToSlip = ValidateOrSlipAlgorithmHeader();
}
private void ValidateAlgorithmHeader(ReadOnlyMemory <byte> encodedAlg, int expectedAlg)
{
int?alg = CoseHelpers.DecodeCoseAlgorithmHeader(encodedAlg);
Debug.Assert(alg.HasValue, "Algorithm (alg) is a known header and should have been validated in Set[Encoded]Value()");
if (expectedAlg != alg.Value)
{
string exMsg;
if (_keyType == KeyType.RSA)
{
exMsg = SR.Format(SR.Sign1SignCoseAlgorithmDoesNotMatchSpecifiedKeyHashAlgorithmAndPadding, alg.Value, _keyType, HashAlgorithm.Name, RSASignaturePadding);
}
else
{
exMsg = SR.Format(SR.Sign1SignCoseAlgorithmDoesNotMatchSpecifiedKeyAndHashAlgorithm, alg.Value, _keyType, HashAlgorithm.Name);
}
throw new CryptographicException(exMsg);
}
}
public CoseSigner(RSA key, RSASignaturePadding signaturePadding, HashAlgorithmName hashAlgorithm, CoseHeaderMap?protectedHeaders = null, CoseHeaderMap?unprotectedHeaders = null)
{
if (key is null)
{
throw new ArgumentNullException(nameof(key));
}
if (signaturePadding is null)
{
throw new ArgumentNullException(nameof(signaturePadding));
}
Key = key;
HashAlgorithm = hashAlgorithm;
RSASignaturePadding = signaturePadding;
_protectedHeaders = protectedHeaders;
_unprotectedHeaders = unprotectedHeaders;
_keyType = CoseHelpers.GetKeyType(key);
_algHeaderValueToSlip = ValidateOrSlipAlgorithmHeader();
}
/// <summary>
/// Initializes a new instance of the <see cref="CoseHeaderLabel"/> struct.
/// </summary>
/// <param name="label">The header label as an integer.</param>
public CoseHeaderLabel(int label)
{
this = default;
LabelAsInt32 = label;
EncodedSize = CoseHelpers.GetIntegerEncodedSize(label);
}