# Quiz 40 What is the bit length requirement for RIPEMD-160 message blocks? **Type all answers and select the correct one** * [x] 448 bits congruent to 512 bits in length. * [ ] 256 bits congruent to 512 bits in length. * [ ] 1024 bits congruent to 2048 bits in length. * [ ] 128 bits congruent to 256 bits in length. **Note to Learners** The message blocks found in RIPEMD-160 have the same bit length requirements as SHA-256 -- they must be padded to 448 congruent to 512 bits in length. To learn more about it, you can follow the course [Walkthrough Implementation of RIPEMD-160 in Golang](https://bsvblockchain.360learning.com/course/play/68beaa72463d6d5e89903937) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://hub.bsvblockchain.org/higher-learning/bsv-academy/bitcoin-primitives-hash-functions/quiz-bitcoin-hash-functions/quiz-40.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.