[#EVP_PKEY_verify]
= EVP_PKEY_verify
:mrdocs:

Verify a signature over `tbs` using an initialised key context.

== Synopsis

Declared in `<openssl/evp.h>`

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

== Return Value

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

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Context previously prepared with EVP_PKEY_verify_init() or _ex().
| *sig*
| Signature bytes to verify.
| *siglen*
| Length of `sig` in bytes.
| *tbs*
| Data that was signed (typically a digest or raw message).
| *tbslen*
| Length of `tbs` in bytes.
|===


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