---
name: "CURLOPT_SSH_HOST_PUBLIC_KEY_SHA256"
section: "3"
platform: "macos"
package: "curl"
version: "166.0.0.0.1"
release: "macOS 26.5"
platforms: ["linux", "macos"]
url: "https://new.carta.tech/CURLOPT_SSH_HOST_PUBLIC_KEY_SHA256"
---

# CURLOPT\_SSH\_HOST\_PUBLIC\_KEY\_SHA256(3)

SHA256 hash of SSH server public key

## NAME

CURLOPT\_SSH\_HOST\_PUBLIC\_KEY\_SHA256 - SHA256 hash of SSH server public key

## SYNOPSIS

```
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSH_HOST_PUBLIC_KEY_SHA256,
                          char *sha256);
```

## DESCRIPTION

Pass a char pointer pointing to a string containing a Base64-encoded SHA256 hash of the remote host's public key. The transfer fails if the given hash does not match the hash the remote host provides.

## DEFAULT

NULL

## PROTOCOLS

SCP and SFTP

## EXAMPLE

```
int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode res;
    curl_easy_setopt(curl, CURLOPT_URL, "sftp://example.com/file");
    curl_easy_setopt(curl, CURLOPT_SSH_HOST_PUBLIC_KEY_SHA256,
                     "NDVkMTQxMGQ1ODdmMjQ3MjczYjAyOTY5MmRkMjVmNDQ=");
    res = curl_easy_perform(curl);
    curl_easy_cleanup(curl);
  }
}
```

## AVAILABILITY

Added in 7.80.0 Requires the libssh2 backend.

## RETURN VALUE

Returns CURLE\_OK if the option is supported, CURLE\_UNKNOWN\_OPTION if not, or CURLE\_OUT\_OF\_MEMORY if there was insufficient heap space.

## SEE ALSO

[**CURLOPT\_SSH\_AUTH\_TYPES**(3)](/CURLOPT_SSH_AUTH_TYPES/3.md), [**CURLOPT\_SSH\_HOST\_PUBLIC\_KEY\_MD5**(3)](/CURLOPT_SSH_HOST_PUBLIC_KEY_MD5/3.md), [**CURLOPT\_SSH\_PUBLIC\_KEYFILE**(3)](/CURLOPT_SSH_PUBLIC_KEYFILE/3.md)