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/**
 *  sgx - wasm
 * @param task_buf ciphertext which include private key of transaction || wasm bytecode
 * @param task_buf length of ciphertext and wasm bytecode
 * @param result_buf result buffer provided
 * @param result_size length of result buffer provided
 * @return  Upon successful completion, the actual length of result_buf is returned.
 *           Otherwise, a value of -length of result is returned, while result_buf is filled with error messages.
 */
ssize_t ecall_wasm(const void *task_buf, size_t task_size, uint8_t *result_buf, size_t result_size);


/**
 *
 * @param out attestation with ecdhe public key
 * @param out_length length of out buffer
 * @param nonce [in] addr of nonce
 * @param nonce_length [in] length of nonce
 * @return  Upon successful completion, the actual length of out buffer is returned.
 *          Otherwise, return a negative value as error code.
 */
ssize_t ecall_attest(uint8_t * out, size_t out_length, const void *nonce, size_t nonce_length);


/**
 *
 * @param out sm2 signature (asn1) compatible with go
 * @param out_length length of out buffer
 * @param key [in] addr of sm2 private key
 * @param key_length [in] length of key
 * @param hash [in] addr of pre-processed sm3 hash of message
 * @param hash_length [in] length of hash
 * @return  Upon successful completion, the actual length of out buffer is returned.
 *          Otherwise, return a negative value as error code.
 */
static int sm2_sign(void *out, size_t out_length, const void *key, size_t key_length = 32,
                    const void *hash, size_t hash_length = 32);

/**
 *
 * @param out plain text
 * @param out_length length of out buffer
 * @param key [in] addr of sm2 private key
 * @param key_length [in] length of key
 * @param ciphertext [in] sm2 ciphertext c1||c3||c2
 * @param ciphertext_length [in] length of ciphertext
 * @return
 */
static int sm2_decrypt(void *out, size_t out_length, const void *key, size_t key_length = 32,
                    const void *ciphertext, size_t ciphertext_length);

#include "limits.h"
#include "stdint.h"
INT32_MAX