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If the block cipher uses for instance 256-bit keys then each message block (m<sub>i</sub>) is a 256-bit chunk of the message. If the same block cipher uses a block size of 128 bits then the input and output hash values in each round is 128 bits.
Variations of this method replace XOR with any other group operation, such as addition on 32-bit unsigned integers.
Davies-Meyer compression functions make it easy to find fixed-points, though these can't be used directly in collision attacks when the compression function is used in the Damgård-Merkle construction.
:''Note: There is some more information in the [[Davies-Meyer hash|old Davies-Meyer article]] that has not been merged to this article yet.''
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