/// <summary>
/// Computes the hash value of a subset of the specified byte array using the
/// specified hash algorithm, and signs the resulting hash value.
/// </summary>
/// <param name="inputStream">The input data for which to compute the hash</param>
/// <param name="halg">The hash algorithm to use to create the hash value. </param>
/// <returns>The RSA signature for the specified data.</returns>
public byte[] SignData(Stream inputStream, object halg)
{
int calgHash = CapiHelper.ObjToHashAlgId(halg);
HashAlgorithmName hashAlgorithmName = CapiHelper.AlgIdToHashAlgorithmName(calgHash);
byte[] hashVal = HashOneShotHelpers.HashData(hashAlgorithmName, inputStream);
return(SignHash(hashVal, calgHash));
}
/// <summary>
/// Verifies the signature of a hash value.
/// </summary>
public bool VerifyData(byte[] buffer, object halg, byte[] signature)
{
int calgHash = CapiHelper.ObjToHashAlgId(halg);
HashAlgorithmName hashAlgorithmName = CapiHelper.AlgIdToHashAlgorithmName(calgHash);
byte[] hashVal = HashOneShotHelpers.HashData(hashAlgorithmName, buffer);
return(VerifyHash(hashVal, calgHash, signature));
}
/// <summary>
/// Computes the hash value of a subset of the specified byte array using the
/// specified hash algorithm, and signs the resulting hash value.
/// </summary>
/// <param name="buffer">The input data for which to compute the hash</param>
/// <param name="offset">The offset into the array from which to begin using data</param>
/// <param name="count">The number of bytes in the array to use as data. </param>
/// <param name="halg">The hash algorithm to use to create the hash value. </param>
/// <returns>The RSA signature for the specified data.</returns>
public byte[] SignData(byte[] buffer, int offset, int count, object halg)
{
int calgHash = CapiHelper.ObjToHashAlgId(halg);
HashAlgorithmName hashAlgorithmName = CapiHelper.AlgIdToHashAlgorithmName(calgHash);
byte[] hashVal = HashOneShotHelpers.HashData(hashAlgorithmName, new ReadOnlySpan <byte>(buffer, offset, count));
return(SignHash(hashVal, calgHash));
}
protected override byte[] HashData(Stream data, HashAlgorithmName hashAlgorithm)
{
if (hashAlgorithm != HashAlgorithmName.SHA1)
{
throw new CryptographicException(SR.Cryptography_UnknownHashAlgorithm, hashAlgorithm.Name);
}
return(HashOneShotHelpers.HashData(hashAlgorithm, data));
}
protected override byte[] HashData(byte[] data, int offset, int count, HashAlgorithmName hashAlgorithm)
{
if (hashAlgorithm != HashAlgorithmName.SHA1)
{
throw new CryptographicException(SR.Cryptography_UnknownHashAlgorithm, hashAlgorithm.Name);
}
return(HashOneShotHelpers.HashData(hashAlgorithm, new ReadOnlySpan <byte>(data, offset, count)));
}
protected override byte[] HashData(byte[] data, int offset, int count, HashAlgorithmName hashAlgorithm)
{
// we're sealed and the base should have checked this already
Debug.Assert(data != null);
Debug.Assert(offset >= 0 && offset <= data.Length);
Debug.Assert(count >= 0 && count <= data.Length);
Debug.Assert(!string.IsNullOrEmpty(hashAlgorithm.Name));
return(HashOneShotHelpers.HashData(hashAlgorithm, new ReadOnlySpan <byte>(data, offset, count)));
}
protected override byte[] HashData(byte[] data, int offset, int count, HashAlgorithmName hashAlgorithm)
{
if (hashAlgorithm != HashAlgorithmName.SHA1)
{
// Matching DSACryptoServiceProvider's "I only understand SHA-1/FIPS 186-2" exception
throw new CryptographicException(SR.Cryptography_UnknownHashAlgorithm, hashAlgorithm.Name);
}
return(HashOneShotHelpers.HashData(hashAlgorithm, new ReadOnlySpan <byte>(data, offset, count)));
}
protected virtual byte[] HashData(Stream data, HashAlgorithmName hashAlgorithm) => HashOneShotHelpers.HashData(hashAlgorithm, data);
protected virtual byte[] HashData(byte[] data, int offset, int count, HashAlgorithmName hashAlgorithm) => HashOneShotHelpers.HashData(hashAlgorithm, new ReadOnlySpan <byte>(data, offset, count));