Sign the DER encoding of data using it and write AlgorithmIdentifier(s) plus the signature.

Synopsis

Declared in <openssl/asn1.h>

int
ASN1_item_sign_ex(
    ASN1_ITEM const* it,
    X509_ALGOR* algor1,
    X509_ALGOR* algor2,
    ASN1_BIT_STRING* signature,
    void const* data,
    ASN1_OCTET_STRING const* id,
    EVP_PKEY* pkey,
    EVP_MD const* md,
    OSSL_LIB_CTX* libctx,
    char const* propq);

Return Value

1 on success, or 0 on failure.

Parameters

Name

Description

it

ASN.1 item describing data.

algor1

First AlgorithmIdentifier to fill (for example signatureAlgorithm), or NULL.

algor2

Optional second AlgorithmIdentifier to fill, or NULL.

signature

BIT STRING that receives the signature bytes.

data

Object whose DER encoding is signed.

id

Optional ASN.1 OCTET STRING identity / SM2‐id parameter, or NULL.

pkey

Private key used to create the signature.

md

Digest method, or NULL to use the key‐type default.

libctx

Library context for algorithm fetches, or NULL for the default.

propq

Property query for algorithm fetches, or NULL.

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