[#PKCS7_ISSUER_AND_SERIAL_digest]
= PKCS7_ISSUER_AND_SERIAL_digest
:mrdocs:

Digest the DER encoding of a PKCS7_ISSUER_AND_SERIAL structure.

== Synopsis

Declared in `<openssl/pkcs7.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
PKCS7_ISSUER_AND_SERIAL_digest(
    xref:PKCS7_ISSUER_AND_SERIAL.adoc[PKCS7_ISSUER_AND_SERIAL]* data,
    xref:EVP_MD.adoc[EVP_MD] const* type,
    unsigned char* md,
    unsigned int* len);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *data*
| Issuer‐and‐serial value whose ASN.1 encoding is hashed.
| *type*
| Digest algorithm used to hash the DER encoding.
| *md*
| Buffer that receives the digest bytes (at least EVP_MD_size(`type)).`
| *len*
| Receives the digest length in bytes.
|===


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