[#PKCS5_pbe2_set_scrypt]
= PKCS5_pbe2_set_scrypt
:mrdocs:

Build a PBES2 AlgorithmIdentifier that derives the key with scrypt.

== Synopsis

Declared in `<openssl/x509.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:X509_ALGOR.adoc[X509_ALGOR]*
PKCS5_pbe2_set_scrypt(
    xref:EVP_CIPHER-07.adoc[EVP_CIPHER] const* cipher,
    unsigned char const* salt,
    int saltlen,
    unsigned char* aiv,
    uint64_t N,
    uint64_t r,
    uint64_t p);
----

== Return Value

New X509_ALGOR describing the PBES2/scrypt parameters, or NULL on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *cipher*
| Content‐encryption cipher wrapped by PBES2.
| *salt*
| Salt octets for scrypt, or NULL to generate a default‐length salt.
| *saltlen*
| Length of `salt` in bytes; ignored when `salt` is NULL.
| *aiv*
| Optional IV octets for `cipher,` or NULL to generate a suitable IV.
| *N*
| scrypt CPU/memory cost parameter.
| *r*
| scrypt block size parameter.
| *p*
| scrypt parallelization parameter.
|===


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