[#ASN1_verify]
= ASN1_verify
:mrdocs:

Verify a signature over the DER encoding produced by `i2d` (deprecated).

== Synopsis

Declared in `<openssl/x509.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
ASN1_verify(
    xref:i2d_of_void.adoc[i2d_of_void]* i2d,
    xref:X509_ALGOR.adoc[X509_ALGOR]* algor1,
    xref:ASN1_BIT_STRING.adoc[ASN1_BIT_STRING]* signature,
    char* data,
    xref:EVP_PKEY.adoc[EVP_PKEY]* pkey);
----

[WARNING]
====
https://en.cppreference.com/cpp/language/attributes/deprecated[Deprecated^]. Use of this entity is allowed but discouraged.
====
== Description

Prefer ASN1_item_verify() for new code.

== Return Value

1 if the signature verifies, 0 if it does not, or ‐1 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *i2d*
| Encoder that writes the signed bytes for `data.`
| *algor1*
| Signature AlgorithmIdentifier describing the digest/signature pair.
| *signature*
| BIT STRING holding the signature value.
| *data*
| Structure passed to `i2d` as the object being signed.
| *pkey*
| Public key used to verify the signature.
|===


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