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This hastily written implementation of HKDF in C# agrees with the RFC test vectors: private const int SHA1 = 1; private const int SHA256 = 2; private static HMAC NewHMAC(int h, byte[] key) { switch (h) { case SHA1: return new HMACSHA1(key); case SHA256: return new ...


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One common pitfall when implementing HMAC(key, data) is mishandling the case when key is longer than the underlying hash block. In your case salt is 80 octets, which is longer that SHA-256 "block" (64 octets) so the salt have to be run through SHA-256 before being XOR'ed with i_padin the HMAC. Without seeing any actual code, and provided that the test ...



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