Esempi in C# (CSharp) per System.Security.Cryptography.HMACSHA256.TransformFinalBlock

Esempio n. 1

File: TLSUtils.cs Progetto: fossabot/openrelay-cdk-unity

        public static byte[] PseudorandomFunction(byte[] secret, byte[] seed, int length)
        {
            byte[] result = new byte[length];
            System.Security.Cryptography.HMACSHA256 hmac = new System.Security.Cryptography.HMACSHA256(secret);
            int iterations = (int)Math.Ceiling(length / (double)hmac.HashSize);

            byte[] dataToHash = seed;
            int    offset     = 0;

            for (int index = 0; index < iterations; index++)
            {
                dataToHash = hmac.ComputeHash(dataToHash);
                hmac.TransformBlock(dataToHash, 0, dataToHash.Length, dataToHash, 0);
                byte[] hash = hmac.TransformFinalBlock(seed, 0, seed.Length);
                Buffer.BlockCopy(hash, 0, result, offset, Math.Min(hash.Length, length - offset));
                offset += hash.Length;
            }
            return(result);
        }

Esempio n. 2

File: TLSUtils.cs Progetto: CreatorDev/DTLS.Net

		public static byte[] PseudorandomFunction(byte[] secret, byte[] seed, int length)
		{
			byte[] result = new byte[length];
			System.Security.Cryptography.HMACSHA256 hmac = new System.Security.Cryptography.HMACSHA256(secret);
			int iterations = (int)Math.Ceiling(length / (double)hmac.HashSize);
			byte[] dataToHash = seed;
			int offset = 0;
			for (int index = 0; index < iterations; index++)
			{
				dataToHash = hmac.ComputeHash(dataToHash);
				hmac.TransformBlock(dataToHash, 0, dataToHash.Length, dataToHash, 0);
				byte[] hash = hmac.TransformFinalBlock(seed, 0, seed.Length);
				Buffer.BlockCopy(hash, 0, result, offset, Math.Min(hash.Length, length - offset));
				offset += hash.Length;
			}
			return result;
		}