Adds a known host to the collection of known hosts identified by the 'hosts' handle.
host is a pointer the host name in plain text or hashed. If hashed, it must be provided base64 encoded. The host name can be the IP numerical address of the host or the full name.
If you want to add a key for a specific port number for the given host, you must provide the host name like '[host]:port' with the actual characters '[' and ']' enclosing the host name and a colon separating the host part from the port number. For example: "[host.example.com]:222".
salt is a pointer to the salt used for the host hashing, if the host is provided hashed. If the host is provided in plain text, salt has no meaning. The salt has to be provided base64 encoded with a trailing zero byte.
key is a pointer to the key for the given host.
keylen is the total size in bytes of the key pointed to by the key argument
comment is a pointer to a comment for the key.
commentlen is the total size in bytes of the comment pointed to by the comment argument
typemask is a bitmask that specifies format and info about the data passed to this function. Specificly, it details what format the host name is, what format the key is and what key type it is.
The host name is given as one of the following types: LIBSSH2_KNOWNHOST_TYPE_PLAIN, LIBSSH2_KNOWNHOST_TYPE_SHA1 or LIBSSH2_KNOWNHOST_TYPE_CUSTOM.
The key is encoded using one of the following encodings: LIBSSH2_KNOWNHOST_KEYENC_RAW or LIBSSH2_KNOWNHOST_KEYENC_BASE64.
The key is using one of these algorithms: LIBSSH2_KNOWNHOST_KEY_RSA1, LIBSSH2_KNOWNHOST_KEY_SSHRSA or LIBSSH2_KNOWNHOST_KEY_SSHDSS.
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