[#EVP_DigestVerify]
= EVP_DigestVerify
:mrdocs:

Verify `sigret` over `tbs` in one call using a prepared DigestVerify context.

== Synopsis

Declared in `<openssl/evp.h>`

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

== Return Value

1 if the signature is valid, 0 if it is invalid, or a negative value on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Context initialized with EVP_DigestVerifyInit().
| *sigret*
| Signature bytes to verify.
| *siglen*
| Length of `sigret` in bytes.
| *tbs*
| Message bytes that were signed ("to be signed").
| *tbslen*
| Length of `tbs` in bytes.
|===


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