[#PKCS5_v2_scrypt_keyivgen_ex]
= PKCS5_v2_scrypt_keyivgen_ex
:mrdocs:

Initialize `ctx` for scrypt‐based PBE using a library context.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
PKCS5_v2_scrypt_keyivgen_ex(
    xref:EVP_CIPHER_CTX.adoc[EVP_CIPHER_CTX]* ctx,
    char const* pass,
    int passlen,
    xref:ASN1_TYPE.adoc[ASN1_TYPE]* param,
    xref:EVP_CIPHER-07.adoc[EVP_CIPHER] const* c,
    xref:EVP_MD.adoc[EVP_MD] const* md,
    int en_de,
    xref:OSSL_LIB_CTX.adoc[OSSL_LIB_CTX]* libctx,
    char const* propq);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Cipher context to initialize.
| *pass*
| Password bytes.
| *passlen*
| Length of `pass,` or ‐1 if NUL‐terminated.
| *param*
| ASN.1 parameters describing salt and scrypt settings.
| *c*
| Content cipher to initialize.
| *md*
| Unused for scrypt (may be NULL).
| *en_de*
| 1 to encrypt, or 0 to decrypt.
| *libctx*
| Library context for algorithm fetches, or NULL for the default.
| *propq*
| Property query for algorithm fetches, or NULL.
|===


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