sha512_final
ATTRIBUTE_WARN_UNUSED_RET int sha512_final(sha512_context *ctx, u8 output[SHA512_DIGEST_SIZE]);
return sha512_final((sha512_context*)hctx, output);
ret = sha512_final(&ctx, output);
ret = sha512_final(&ctx, output);
LEGACY_EVP_MD_METH_TABLE(sha512_init, sha512_update, sha512_final, NULL,