EVP_PKEY_digestsign_supports_digest - indicate support for signature digest

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       Licensed under the Apache License 2.0 (the "License").  You may not use this file except in compliance
       with the License.  You can obtain a copy in the file LICENSE in the source distribution or at
       <https://www.openssl.org/source/license.html>.

3.5.0                                              2025-06-04          EVP_PKEY_DIGESTSIGN_SUPPORTS_DIGEST(3SSL)

       The EVP_PKEY_digestsign_supports_digest() function queries whether the message digest name is supported
       for public key signature operations associated with key pkey. The query is done within an optional
       library context libctx and with an optional property query propq.

       The EVP_PKEY_digestsign_supports_digest() function was added in OpenSSL 3.0.

       EVP_PKEY_digestsign_supports_digest - indicate support for signature digest

       The EVP_PKEY_digestsign_supports_digest() function returns 1 if the message digest algorithm identified
       by name can be used for public key signature operations associated with key pkey and 0 if it cannot be
       used. It returns a negative value for failure.

EVP_DigestSignInit_ex(3),

        #include <openssl/evp.h>
        int EVP_PKEY_digestsign_supports_digest(EVP_PKEY *pkey, OSSL_LIB_CTX *libctx,
                                                const char *name, const char *propq);