sodium_crypto_kdf_derive_from_key
PHP 7 >= 7.2.0, PHP 8
sodium_crypto_kdf_derive_from_key - Derive a subkey
Manual
sodium_crypto_kdf_derive_from_key(
int$subkey_length,
int$subkey_id,
string$context,
string$key
): string
int$subkey_length,
int$subkey_id,
string$context,
string$key
): string
Derive a subkey from a root key and additional context.
Similar to hash_hkdf.
Parameters
- subkey_length
-
Length of the key to return (in bytes)
- subkey_id
-
Return the Nth subkey from a given root key. Useful for seeking.
- context
-
Application-specific context.
- key
-
The root key from which the subkey is derived.
Return Values
A string of pseudorandom (raw binary) bytes.