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This commit introduces two new functions, EVP_MD_CTX_serialize and EVP_MD_CTX_deserialize, to the EVP digest API. These functions allow an application to save the state of a digest context (EVP_MD_CTX) and restore it later. This is useful for checkpointing long-running computations, enabling them to be paused and resumed without starting over. The implementation adds the OSSL_FUNC_DIGEST_SERIALIZE and OSSL_FUNC_DIGEST_DESERIALIZE dispatch functions for providers to supply this functionality. Signed-off-by: Simo Sorce <simo@redhat.com> Reviewed-by: Shane Lontis <shane.lontis@oracle.com> Reviewed-by: Tomas Mraz <tomas@openssl.org> Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com> (Merged from https://github.com/openssl/openssl/pull/28837)