[hash_digest] 计算消息摘要（支持多算法批量计算）。 【支持算法】Sha1 / Sha224 / Sha256 / Sha384 / Sha512 / Sm3 / Shake128 / Shake256。 【参数】 - plain_in_hex：明文 Hex 字符串（原始数据 1B ~ 16MB） - required_hash_modes：字符串数组，指定需要计算的算法列表，默认计算全部算法 - shake_output_length：SHAKE 系列的输出字节长度（32~256，默认 64），仅在 required_hash_modes 包含 Shake128 或 Sha...
Part of the CipherHUB Cryptography Toolkit server.
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AI agents call hash_sum to retrieve information from CipherHUB Cryptography Toolkit without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though hash_sum only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"hash_sum": {}
}
}See the full CipherHUB Cryptography Toolkit policy for all 32 tools.
These attack patterns abuse exactly the kind of access hash_sum gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
[hash_digest] 计算消息摘要（支持多算法批量计算）。 【支持算法】Sha1 / Sha224 / Sha256 / Sha384 / Sha512 / Sm3 / Shake128 / Shake256。 【参数】 - plain_in_hex：明文 Hex 字符串（原始数据 1B ~ 16MB） - required_hash_modes：字符串数组，指定需要计算的算法列表，默认计算全部算法 - shake_output_length：SHAKE 系列的输出字节长度（32~256，默认 64），仅在 required_hash_modes 包含 Shake128 或 Shake256 时生效 【输出】Results 字典，每个算法对应 hash_sum_in_hex（摘要 Hex）和 hash_length（字节数）。 【SHAKE 说明】SHAKE128/256 是 XOF（可扩展输出函数），输出长度可变，适合需要自定义长度密钥派生的场景。. It is categorised as a Read tool in the CipherHUB Cryptography Toolkit MCP Server, which means it retrieves data without modifying state.
Register the CipherHUB Cryptography Toolkit MCP server in PolicyLayer and add a rule for hash_sum: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches CipherHUB Cryptography Toolkit. Nothing to install.
hash_sum is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the hash_sum rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for hash_sum. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
hash_sum is provided by the CipherHUB Cryptography Toolkit MCP server (https://tools.cipherhub.cloud/cipherhub/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 32 CipherHUB Cryptography Toolkit tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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