[#EVP_DigestSign]
= EVP_DigestSign
:mrdocs:

Sign `tbs` in one call using a prepared DigestSign context.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_DigestSign(
    xref:EVP_MD_CTX.adoc[EVP_MD_CTX]* ctx,
    unsigned char* sigret,
    size_t* siglen,
    unsigned char const* tbs,
    size_t tbslen);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Context initialized with EVP_DigestSignInit().
| *sigret*
| Output buffer for the signature, or NULL to query the required length.
| *siglen*
| On input, size of `sigret;` on output, signature length.
| *tbs*
| Message bytes to sign ("to be signed").
| *tbslen*
| Length of `tbs` in bytes.
|===


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