/* Provenance: openssl/openssl sm2_asym_decrypt (fixed).
 * repo: openssl/openssl
 * commit: 36cf45ef3ba71e44a8be06ee81cb31aa02cb0010
 * parent: 4b8a8bb75229b64d1c7598d845fdc3c7e7d7eee2
 * commit_url: https://github.com/openssl/openssl/commit/36cf45ef3ba71e44a8be06ee81cb31aa02cb0010
 * cve: CVE-2021-3711
 * license: OpenSSL License
 * function: sm2_asym_decrypt
 * relpath: providers/implementations/asymciphers/sm2_enc.c
 */

static int sm2_asym_decrypt(void *vpsm2ctx, unsigned char *out, size_t *outlen,
                            size_t outsize, const unsigned char *in,
                            size_t inlen)
{
    PROV_SM2_CTX *psm2ctx = (PROV_SM2_CTX *)vpsm2ctx;
    const EVP_MD *md = sm2_get_md(psm2ctx);

    if (md == NULL)
        return 0;

    if (out == NULL) {
        if (!ossl_sm2_plaintext_size(in, inlen, outlen))
            return 0;
        return 1;
    }

    return ossl_sm2_decrypt(psm2ctx->key, md, in, inlen, out, outlen);
}