| --- |
| page_title: sha1 - Functions - Configuration Language |
| description: |- |
| The sha1 function computes the SHA1 hash of a given string and encodes it |
| with hexadecimal digits. |
| --- |
| |
| # `sha1` Function |
| |
| `sha1` computes the SHA1 hash of a given string and encodes it with |
| hexadecimal digits. |
| |
| The given string is first encoded as UTF-8 and then the SHA1 algorithm is applied |
| as defined in [RFC 3174](https://tools.ietf.org/html/rfc3174). The raw hash is |
| then encoded to lowercase hexadecimal digits before returning. |
| |
| Collision attacks have been successfully performed against this hashing |
| function. Before using this function for anything security-sensitive, review |
| relevant literature to understand the security implications. |
| |
| ## Examples |
| |
| ``` |
| > sha1("hello world") |
| 2aae6c35c94fcfb415dbe95f408b9ce91ee846ed |
| ``` |
| |
| ## Related Functions |
| |
| * [`filesha1`](/terraform/language/functions/filesha1) calculates the same hash from |
| the contents of a file rather than from a string value. |
