[#EVP_PBE_scrypt]
= EVP_PBE_scrypt
:mrdocs:

Derive a key with scrypt from a password and salt.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PBE_scrypt(
    char const* pass,
    size_t passlen,
    unsigned char const* salt,
    size_t saltlen,
    uint64_t N,
    uint64_t r,
    uint64_t p,
    uint64_t maxmem,
    unsigned char* key,
    size_t keylen);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *pass*
| Password bytes (may be NULL when `passlen` is 0).
| *passlen*
| Length of `pass` in bytes.
| *salt*
| Salt octets.
| *saltlen*
| Length of `salt` in bytes.
| *N*
| CPU/memory cost parameter (power of two).
| *r*
| Block size parameter.
| *p*
| Parallelization parameter.
| *maxmem*
| Memory limit in bytes (0 selects the library default).
| *key*
| Output buffer for the derived key.
| *keylen*
| Desired derived‐key length in bytes.
|===


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