参考博客
加解密
签名验签
加解密
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "openssl/ec.h"
#include "openssl/evp.h"
/**************************************************
* Main function return value:
0: main function executes successfully
-1: an error occurs
**************************************************/
int main(void)
{
int ret = -1, i;
EVP_PKEY_CTX *pctx = NULL, *ectx = NULL;
EVP_PKEY *pkey = NULL;
unsigned char message[16] = { 0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,
0x8, 0x9, 0xA, 0xB, 0xC, 0xD, 0xE, 0xF };
size_t message_len = sizeof(message);
unsigned char *ciphertext = NULL, *plaintext = NULL;
size_t ciphertext_len, plaintext_len;
EC_KEY *key_pair = NULL;
const BIGNUM *priv_key = NULL;
char *priv_key_str = NULL;
const EC_GROUP *group = NULL;
const EC_POINT *pub_key = NULL;
BN_CTX *ctx = NULL;
BIGNUM *x_coordinate = NULL, *y_coordinate = NULL;
char *x_coordinate_str = NULL, *y_coordinate_str = NULL;
/* create SM2 Ellipse Curve parameters and key pair */
if ( !(pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_EC, NULL)) )
{
goto clean_up;
}
if ( (EVP_PKEY_paramgen_init(pctx)) != 1 )
{
goto clean_up;
}
if ( (EVP_PKEY_CTX_set_ec_paramgen_curve_nid(pctx, NID_sm2)) <= 0 )
{
goto clean_up;
}
if ( (EVP_PKEY_keygen_init(pctx)) != 1 )
{
goto clean_up;
}
if ( (EVP_PKEY_keygen(pctx, &pkey)) != 1 )
{
goto clean_up;
}
/* print SM2 key pair */
if ( !(key_pair = EVP_PKEY_get0_EC_KEY(pkey)) )
{
goto clean_up;
}
if ( !(priv_key = EC_KEY_get0_private_key(key_pair)) )
{
goto clean_up;
}
if ( !(priv_key_str = BN_bn2hex(priv_key)) )
{
goto clean_up;
}
printf("SM2 private key (in hex form):\n");
printf("%s\n\n", priv_key_str);
if ( !(pub_key = EC_KEY_get0_public_key(key_pair)) )
{
goto clean_up;
}
if ( !(group = EC_KEY_get0_group(key_pair)) )
{
goto clean_up;
}
if ( !(ctx = BN_CTX_new()) )
{
goto clean_up;
}
BN_CTX_start(ctx);
x_coordinate = BN_CTX_get(ctx);
y_coordinate = BN_CTX_get(ctx);
if ( !(y_coordinate) )
{
goto clean_up;
}
if ( !(EC_POINT_get_affine_coordinates(group, pub_key, x_coordinate, y_coordinate, ctx)) )
{
goto clean_up;
}
if ( !(x_coordinate_str = BN_bn2hex(x_coordinate)) )
{
goto clean_up;
}
printf("x coordinate in SM2 public key (in hex form):\n");
printf("%s\n\n", x_coordinate_str);
if ( !(y_coordinate_str = BN_bn2hex(y_coordinate)) )
{
goto clean_up;
}
printf("y coordinate in SM2 public key (in hex form):\n");
printf("%s\n\n", y_coordinate_str);
/* compute SM2 encryption */
if ( (EVP_PKEY_set_alias_type(pkey, EVP_PKEY_SM2)) != 1 )
{
goto clean_up;
}
if ( !(ectx = EVP_PKEY_CTX_new(pkey, NULL)) )
{
goto clean_up;
}
if ( (EVP_PKEY_encrypt_init(ectx)) != 1 )
{
goto clean_up;
}
if ( (EVP_PKEY_encrypt(ectx, NULL, &ciphertext_len, message, message_len)) != 1 )
{
goto clean_up;
}
if ( !(ciphertext = (unsigned char *)malloc(ciphertext_len)) )
{
goto clean_up;
}
if ( (EVP_PKEY_encrypt(ectx, ciphertext, &ciphertext_len, message, message_len)) != 1 )
{
goto clean_up;
}
printf("Message length: %ld bytes.\n", message_len);
printf("Message:\n");
for (i = 0; i < (int)message_len; i++)
{
printf("0x%x ", message[i]);
}
printf("\n\n");
printf("Ciphertext length: %ld bytes.\n", ciphertext_len);
printf("Ciphertext (ASN.1 encode):\n");
for (i = 0; i < (int)ciphertext_len; i++)
{
printf("0x%x ", ciphertext[i]);
}
printf("\n\n");
/* compute SM2 decryption */
if ( (EVP_PKEY_decrypt_init(ectx)) != 1 )
{
goto clean_up;
}
if ( (EVP_PKEY_decrypt(ectx, NULL, &plaintext_len, ciphertext, ciphertext_len)) != 1 )
{
goto clean_up;
}
if ( !(plaintext = (unsigned char *)malloc(plaintext_len)) )
{
goto clean_up;
}
if ( (EVP_PKEY_decrypt(ectx, plaintext, &plaintext_len, ciphertext, ciphertext_len)) != 1 )
{
goto clean_up;
}
printf("Decrypted plaintext length: %ld bytes.\n", plaintext_len);
printf("Decrypted plaintext:\n");
for (i = 0; i < (int)plaintext_len; i++)
{
printf("0x%x ", plaintext[i]);
}
printf("\n\n");
if ( plaintext_len != message_len )
{
printf("Decrypted data length error!\n");
goto clean_up;
}
if ( memcmp(plaintext, message, message_len) )
{
printf("Decrypt data failed!\n");
goto clean_up;
}
else
{
printf("Encrypt and decrypt data succeeded!\n");
}
ret = 0;
clean_up:
if (pctx)
{
EVP_PKEY_CTX_free(pctx);
}
if (pkey)
{
EVP_PKEY_free(pkey);
}
if (priv_key_str)
{
OPENSSL_free(priv_key_str);
}
if (ctx)
{
BN_CTX_end(ctx);
BN_CTX_free(ctx);
}
if (x_coordinate_str)
{
OPENSSL_free(x_coordinate_str);
}
if (y_coordinate_str)
{
OPENSSL_free(y_coordinate_str);
}
if (ectx)
{
EVP_PKEY_CTX_free(ectx);
}
if (ciphertext)
{
free(ciphertext);
}
if (plaintext)
{
free(plaintext);
}
#if defined(_WIN32) || defined(_WIN64)
system("pause");
#endif
return ret;
}
编译方法
gcc -o sm2_evp_e sm2_evp_e.c -I /usr/local/ssl/inlcude -L /usr/local/ssl/lib -ldl -lpthread -lcrypto
签名验签
/**************************************************
* File name: EVP_sm2_sign_and_verify.c
* Author: HAN Wei
* Author's blog: https://blog.csdn.net/henter/
* Date: April 27th, 2020
* Description: demonstrate how to compute SM2 signature
and verify it by invoking EVP interface
in OpenSSL 1.1.1
**************************************************/
#include <stdio.h>
#include <stdlib.h>
#include "openssl/ec.h"
#include "openssl/evp.h"
/**************************************************
* Main function return value:
0: main function executes successfully
-1: an error occurs
**************************************************/
int main(void)
{
int ret = -1, i;
EVP_PKEY_CTX* pctx = NULL, * sctx = NULL;
EVP_PKEY* pkey = NULL;
EVP_MD_CTX* md_ctx = NULL, * md_ctx_verify = NULL;
unsigned char message[16] = { 0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,
0x8, 0x9, 0xA, 0xB, 0xC, 0xD, 0xE, 0xF };
size_t message_len = sizeof(message);
unsigned char* sig = NULL;
size_t sig_len;
unsigned char sm2_id[] = { 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38,
0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38 };
unsigned int sm2_id_len = sizeof(sm2_id);
EC_KEY* key_pair = NULL;
const BIGNUM* priv_key = NULL;
char* priv_key_str = NULL;
const EC_GROUP* group = NULL;
const EC_POINT* pub_key = NULL;
BN_CTX* ctx = NULL;
BIGNUM* x_coordinate = NULL, * y_coordinate = NULL;
char* x_coordinate_str = NULL, * y_coordinate_str = NULL;
/* create SM2 Ellipse Curve parameters and key pair */
if ( !(pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_EC, NULL)) )
{
goto clean_up;
}
if ( (EVP_PKEY_paramgen_init(pctx)) != 1 )
{
goto clean_up;
}
if ( (EVP_PKEY_CTX_set_ec_paramgen_curve_nid(pctx, NID_sm2)) <= 0 )
{
goto clean_up;
}
if ( (EVP_PKEY_keygen_init(pctx)) != 1 )
{
goto clean_up;
}
if ( (EVP_PKEY_keygen(pctx, &pkey)) != 1 )
{
goto clean_up;
}
/* print SM2 key pair */
if ( !(key_pair = EVP_PKEY_get0_EC_KEY(pkey)) )
{
goto clean_up;
}
if ( !(priv_key = EC_KEY_get0_private_key(key_pair)) )
{
goto clean_up;
}
if ( !(priv_key_str = BN_bn2hex(priv_key)) )
{
goto clean_up;
}
printf("SM2 private key (in hex form):\n");
printf("%s\n\n", priv_key_str);
if ( !(pub_key = EC_KEY_get0_public_key(key_pair)) )
{
goto clean_up;
}
if ( !(group = EC_KEY_get0_group(key_pair)) )
{
goto clean_up;
}
if ( !(ctx = BN_CTX_new()) )
{
goto clean_up;
}
BN_CTX_start(ctx);
x_coordinate = BN_CTX_get(ctx);
y_coordinate = BN_CTX_get(ctx);
if ( !(y_coordinate) )
{
goto clean_up;
}
if ( !(EC_POINT_get_affine_coordinates(group, pub_key, x_coordinate, y_coordinate, ctx)) )
{
goto clean_up;
}
if ( !(x_coordinate_str = BN_bn2hex(x_coordinate)) )
{
goto clean_up;
}
printf("x coordinate in SM2 public key (in hex form):\n");
printf("%s\n\n", x_coordinate_str);
if ( !(y_coordinate_str = BN_bn2hex(y_coordinate)) )
{
goto clean_up;
}
printf("y coordinate in SM2 public key (in hex form):\n");
printf("%s\n\n", y_coordinate_str);
/* compute SM2 signature */
if ( (EVP_PKEY_set_alias_type(pkey, EVP_PKEY_SM2)) != 1 )
{
goto clean_up;
}
if ( !(md_ctx = EVP_MD_CTX_new()) )
{
goto clean_up;
}
if ( !(sctx = EVP_PKEY_CTX_new(pkey, NULL)) )
{
goto clean_up;
}
if ( EVP_PKEY_CTX_set1_id(sctx, sm2_id, sm2_id_len) <= 0 )
{
goto clean_up;
}
EVP_MD_CTX_set_pkey_ctx(md_ctx, sctx);
if ( (EVP_DigestSignInit(md_ctx, NULL, EVP_sm3(), NULL, pkey)) != 1 )
{
goto clean_up;
}
if ( (EVP_DigestSignUpdate(md_ctx, message, message_len)) != 1 )
{
goto clean_up;
}
if ( (EVP_DigestSignFinal(md_ctx, NULL, &sig_len)) != 1 )
{
goto clean_up;
}
if ( !(sig = (unsigned char*)malloc(sig_len)) )
{
goto clean_up;
}
if ( (EVP_DigestSignFinal(md_ctx, sig, &sig_len)) != 1 )
{
goto clean_up;
}
printf("Message length: %ld bytes.\n", message_len);
printf("Message:\n");
for (i = 0; i < (int)message_len; i++)
{
printf("0x%x ", message[i]);
}
printf("\n\n");
printf("SM2 signature length: %ld bytes.\n", sig_len);
printf("SM2 signature (ASN.1 encode):\n");
for (i = 0; i < (int)sig_len; i++)
{
printf("0x%x ", sig[i]);
}
printf("\n\n");
/* verify SM2 signature */
if ( !(md_ctx_verify = EVP_MD_CTX_new()) )
{
goto clean_up;
}
EVP_MD_CTX_set_pkey_ctx(md_ctx_verify, sctx);
if ( (EVP_DigestVerifyInit(md_ctx_verify, NULL, EVP_sm3(), NULL, pkey)) != 1 )
{
goto clean_up;
}
if ( (EVP_DigestVerifyUpdate(md_ctx_verify, message, sizeof(message))) != 1 )
{
goto clean_up;
}
if ( (EVP_DigestVerifyFinal(md_ctx_verify, sig, sig_len)) != 1 )
{
printf("Verify SM2 signature failed!\n");
goto clean_up;
}
else
{
printf("Verify SM2 signature succeeded!\n");
}
ret = 0;
clean_up:
if (pctx)
{
EVP_PKEY_CTX_free(pctx);
}
if (pkey)
{
EVP_PKEY_free(pkey);
}
if (priv_key_str)
{
OPENSSL_free(priv_key_str);
}
if (ctx)
{
BN_CTX_end(ctx);
BN_CTX_free(ctx);
}
if (x_coordinate_str)
{
OPENSSL_free(x_coordinate_str);
}
if (y_coordinate_str)
{
OPENSSL_free(y_coordinate_str);
}
if (md_ctx)
{
EVP_MD_CTX_free(md_ctx);
}
if (sctx)
{
EVP_PKEY_CTX_free(sctx);
}
if (sig)
{
free(sig);
}
if (md_ctx_verify)
{
EVP_MD_CTX_free(md_ctx_verify);
}
#if defined(_WIN32) || defined(_WIN64)
system("pause");
#endif
return ret;
}
编译方法
gcc -o sm2_evp_s sm2_evp_s.c -I /usr/local/ssl/inlcude -L /usr/local/ssl/lib -ldl -lpthread -lcrypto
特别鸣谢：@1201
