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Add JMESPath SHA1 and MD5 documentation #1428

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Add JMESPath SHA1 and MD5 documentation #1428

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70 changes: 70 additions & 0 deletions content/en/docs/writing-policies/jmespath.md
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Expand Up @@ -1084,6 +1084,41 @@ EOF
</p>
</details>

### Md5

<details><summary>Expand</summary>
<p>

The `md5()` function takes a string of any length and returns a fixed hash value. For example, when `md5()` is applied to the string `Alice & Bob`, it produces the hash `def42e1abd2462df1f9f0a4b3d488221`. This function is particularly useful for creating unique yet shorter identifiers, making it a good option when SHA-256’s 64-character output is too long for Kubernetes resource constraints.

| Input 1 | Output |
|--------------------|---------|
| String | String |

**Example:** This policy mutates the names of specified resources to their MD5 hash values.

```yaml
apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
name: md5-demo
spec:
rules:
- name: convert-name-to-hash
match:
any:
- resources:
kinds:
- Pod
mutate:
patchStrategicMerge:
metadata:
name: "{{ md5(request.object.metadata.name) }}"
```

</p>
</details>

### Modulo

<details><summary>Expand</summary>
Expand Down Expand Up @@ -1901,6 +1936,41 @@ spec:
</p>
</details>

### Sha1

<details><summary>Expand</summary>
<p>

The `sha1()` function takes a string of any length and returns a fixed hash value. For example, when `sha1()` is applied to the string `Alice & Bob`, it gives the output as its SHA1 hash, `e3ec484930685a61b0f824cd684a68699d2b98c1`. This function is particularly useful for creating unique yet shorter identifiers, making it a good option when SHA-256’s 64-character output is too long for Kubernetes resource constraints.

| Input 1 | Output |
|--------------------|---------|
| String | String |

**Example:** This policy mutates the names of specified resources to their SHA1 hash values.

```yaml
apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
name: sha1-demo
spec:
rules:
- name: convert-name-to-hash
match:
any:
- resources:
kinds:
- Pod
mutate:
patchStrategicMerge:
metadata:
name: "{{ sha1(request.object.metadata.name) }}"
```

</p>
</details>

### Sha256

<details><summary>Expand</summary>
Expand Down