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A cryptographic hash algorithm is a function which takes a variable size input and produces a fixed size output. The algorithm makes it difficult to find two inputs with the same output or reconstruct the input from the output.
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Cons for stream ciphers that are based on hash functions
In the same post there is also this part regarding using cryptographic hash functions for creating a stream cipher:
A cryptographic hash function is a function which is resistant to preimages, second … What are other issues with stream ciphers that are induced by hash functions? Are they probably less secure? Are they probably slower? Are they probably using to much memory? …