KeyBlobHelpers.cs

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namespace System.Security.Cryptography;
 
internal static class KeyBlobHelpers
{
    internal static byte[] ToUnsignedIntegerBytes(this ReadOnlyMemory<byte> memory, int length)
    {
        if (memory.Length == length)
        {
            return memory.ToArray();
        }
        ReadOnlySpan<byte> span = memory.Span;
        if (memory.Length == length + 1 && span[0] == 0)
        {
            return span.Slice(1).ToArray();
        }
        if (span.Length > length)
        {
            throw new CryptographicException(System.SR.Cryptography_Der_Invalid_Encoding);
        }
        byte[] array = new byte[length];
        span.CopyTo(array.AsSpan(length - span.Length));
        return array;
    }
 
    internal static byte[] ToUnsignedIntegerBytes(this ReadOnlyMemory<byte> memory)
    {
        ReadOnlySpan<byte> span = memory.Span;
        if (span.Length > 1 && span[0] == 0)
        {
            return span.Slice(1).ToArray();
        }
        return span.ToArray();
    }
}