GmSSL/crypto/ecies/ecies_gmssl.c

/* ====================================================================
 * Copyright (c) 2007 - 2017 The GmSSL Project.  All rights reserved.
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 *    notice, this list of conditions and the following disclaimer.
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 *    distribution.
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 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the GmSSL Project.
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 *    guanzhi1980@gmail.com.
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 * 5. Products derived from this software may not be called "GmSSL"
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 *    "This product includes software developed by the GmSSL Project
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 * ====================================================================
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/rand.h>
#include <openssl/ecies.h>

static int ECIES_PARAMS_init_with_type(ECIES_PARAMS *params, int type)
{
			
	return 0;
}

int gmssl_ecies_encrypt(int type, const unsigned char *in, size_t inlen,
	unsigned char *out, size_t *outlen, EC_KEY *ec_key)
{
	ECIES_CIPHERTEXT_VALUE *cv = NULL;
	ECIES_PARAMS params;

	if (!ECIES_PARAMS_init_with_type(&params, type)) {
		return 0;
	}

	RAND_seed(in, inlen);
	if (!(cv = ECIES_do_encrypt(&params, in, inlen, ec_key))) {
		*outlen = 0;
		return 0;
	}

	*outlen = i2d_ECIES_CIPHERTEXT_VALUE(cv, &out);
	ECIES_CIPHERTEXT_VALUE_free(cv);
	return 1;
}

int gmssl_ecies_decrypt(int type, const unsigned char *in, size_t inlen,
	unsigned char *out, size_t *outlen, EC_KEY *ec_key)
{
	ECIES_CIPHERTEXT_VALUE *cv = NULL;
	ECIES_PARAMS params;
	const unsigned char *cp = in;
	unsigned char *der = NULL;
	int derlen = -1;
	int ret = -1;

	if (!ECIES_PARAMS_init_with_type(&params, type)) {
		return -1;
	}

	if (!(cv = d2i_ECIES_CIPHERTEXT_VALUE(NULL, &cp, inlen))) {
		return -1;
	}

	derlen = i2d_ECIES_CIPHERTEXT_VALUE(cv, &der);
	if (derlen != inlen || memcmp(in, der, derlen) != 0) {
		goto end;
	}

	ret = ECIES_do_decrypt(&params, cv, out, outlen, ec_key);

end:
	OPENSSL_clear_free(der, derlen);
	ECIES_CIPHERTEXT_VALUE_free(cv);
	return ret;
}

ECIES_CIPHERTEXT_VALUE *gmssl_ecies_do_encrypt(int type, const unsigned char *in,
                                              size_t inlen, EC_KEY *ec_key)
{
	ECIES_PARAMS param;
	ECIES_PARAMS_init_with_recommended(&param);
	return ECIES_do_encrypt(&param, in, inlen, ec_key);
}

int gmssl_ecies_do_decrypt(int type, const ECIES_CIPHERTEXT_VALUE *in,
	unsigned char *out, size_t *outlen, EC_KEY *ec_key)
{
	ECIES_PARAMS param;
	ECIES_PARAMS_init_with_recommended(&param);
	return ECIES_do_decrypt(&param, in, out, outlen, ec_key);
}