Update - OpenSSL 1.1.1-pre7-dev
This commit is contained in:
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/*
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* Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
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* Copyright 2017 Ribose Inc. All Rights Reserved.
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* Ported from Ribose contributions from Botan.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <openssl/sm2.h>
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#include <openssl/evp.h>
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#include <openssl/bn.h>
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#include <openssl/asn1.h>
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#include <openssl/asn1t.h>
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#include <string.h>
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typedef struct SM2_Ciphertext_st SM2_Ciphertext;
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DECLARE_ASN1_FUNCTIONS(SM2_Ciphertext)
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struct SM2_Ciphertext_st {
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BIGNUM *C1x;
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BIGNUM *C1y;
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ASN1_OCTET_STRING *C3;
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ASN1_OCTET_STRING *C2;
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};
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ASN1_SEQUENCE(SM2_Ciphertext) = {
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ASN1_SIMPLE(SM2_Ciphertext, C1x, BIGNUM),
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ASN1_SIMPLE(SM2_Ciphertext, C1y, BIGNUM),
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ASN1_SIMPLE(SM2_Ciphertext, C3, ASN1_OCTET_STRING),
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ASN1_SIMPLE(SM2_Ciphertext, C2, ASN1_OCTET_STRING),
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} ASN1_SEQUENCE_END(SM2_Ciphertext)
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IMPLEMENT_ASN1_FUNCTIONS(SM2_Ciphertext)
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static size_t EC_field_size(const EC_GROUP *group)
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{
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/* Is there some simpler way to do this? */
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BIGNUM *p = BN_new();
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BIGNUM *a = BN_new();
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BIGNUM *b = BN_new();
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size_t field_size = 0;
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if (p == NULL || a == NULL || b == NULL)
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goto done;
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EC_GROUP_get_curve_GFp(group, p, a, b, NULL);
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field_size = (BN_num_bits(p) + 7) / 8;
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done:
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BN_free(p);
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BN_free(a);
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BN_free(b);
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return field_size;
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}
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size_t SM2_plaintext_size(const EC_KEY *key, const EVP_MD *digest, size_t msg_len)
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{
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const size_t field_size = EC_field_size(EC_KEY_get0_group(key));
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const size_t md_size = EVP_MD_size(digest);
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const size_t overhead = 10 + 2 * field_size + md_size;
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if(msg_len <= overhead)
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return 0;
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return msg_len - overhead;
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}
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size_t SM2_ciphertext_size(const EC_KEY *key, const EVP_MD *digest, size_t msg_len)
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{
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const size_t field_size = EC_field_size(EC_KEY_get0_group(key));
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const size_t md_size = EVP_MD_size(digest);
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return 10 + 2 * field_size + md_size + msg_len;
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}
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int SM2_encrypt(const EC_KEY *key,
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const EVP_MD *digest,
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const uint8_t *msg,
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size_t msg_len, uint8_t *ciphertext_buf, size_t *ciphertext_len)
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{
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int rc = 0;
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size_t i;
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BN_CTX *ctx = NULL;
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BIGNUM *k = NULL;
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BIGNUM *x1 = NULL;
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BIGNUM *y1 = NULL;
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BIGNUM *x2 = NULL;
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BIGNUM *y2 = NULL;
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EVP_MD_CTX *hash = EVP_MD_CTX_new();
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struct SM2_Ciphertext_st ctext_struct;
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const EC_GROUP *group = EC_KEY_get0_group(key);
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const BIGNUM *order = EC_GROUP_get0_order(group);
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const EC_POINT *P = EC_KEY_get0_public_key(key);
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EC_POINT *kG = NULL;
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EC_POINT *kP = NULL;
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uint8_t *msg_mask = NULL;
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uint8_t *x2y2 = NULL;
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uint8_t *C3 = NULL;
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const size_t field_size = EC_field_size(group);
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const size_t C3_size = EVP_MD_size(digest);
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if (field_size == 0 || C3_size == 0)
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goto done;
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kG = EC_POINT_new(group);
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kP = EC_POINT_new(group);
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if (kG == NULL || kP == NULL)
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goto done;
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ctx = BN_CTX_new();
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if (ctx == NULL)
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goto done;
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BN_CTX_start(ctx);
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k = BN_CTX_get(ctx);
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x1 = BN_CTX_get(ctx);
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x2 = BN_CTX_get(ctx);
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y1 = BN_CTX_get(ctx);
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y2 = BN_CTX_get(ctx);
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if (y2 == NULL)
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goto done;
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x2y2 = OPENSSL_zalloc(2 * field_size);
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C3 = OPENSSL_zalloc(C3_size);
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if (x2y2 == NULL || C3 == NULL)
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goto done;
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memset(ciphertext_buf, 0, *ciphertext_len);
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BN_priv_rand_range(k, order);
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if (EC_POINT_mul(group, kG, k, NULL, NULL, ctx) == 0)
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goto done;
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if (EC_POINT_get_affine_coordinates_GFp(group, kG, x1, y1, ctx) == 0)
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goto done;
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if (EC_POINT_mul(group, kP, NULL, P, k, ctx) == 0)
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goto done;
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if (EC_POINT_get_affine_coordinates_GFp(group, kP, x2, y2, ctx) == 0)
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goto done;
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BN_bn2binpad(x2, x2y2, field_size);
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BN_bn2binpad(y2, x2y2 + field_size, field_size);
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msg_mask = OPENSSL_zalloc(msg_len);
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if (msg_mask == NULL)
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goto done;
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/* X9.63 with no salt happens to match the KDF used in SM2 */
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if (ECDH_KDF_X9_62(msg_mask, msg_len, x2y2, 2 * field_size, NULL, 0, digest)
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== 0)
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goto done;
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for (i = 0; i != msg_len; ++i)
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msg_mask[i] ^= msg[i];
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if (EVP_DigestInit(hash, digest) == 0)
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goto done;
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if (EVP_DigestUpdate(hash, x2y2, field_size) == 0)
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goto done;
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if (EVP_DigestUpdate(hash, msg, msg_len) == 0)
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goto done;
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if (EVP_DigestUpdate(hash, x2y2 + field_size, field_size) == 0)
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goto done;
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if (EVP_DigestFinal(hash, C3, NULL) == 0)
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goto done;
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ctext_struct.C1x = x1;
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ctext_struct.C1y = y1;
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ctext_struct.C3 = ASN1_OCTET_STRING_new();
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ASN1_OCTET_STRING_set(ctext_struct.C3, C3, C3_size);
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ctext_struct.C2 = ASN1_OCTET_STRING_new();
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ASN1_OCTET_STRING_set(ctext_struct.C2, msg_mask, msg_len);
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*ciphertext_len = i2d_SM2_Ciphertext(&ctext_struct, &ciphertext_buf);
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ASN1_OCTET_STRING_free(ctext_struct.C2);
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ASN1_OCTET_STRING_free(ctext_struct.C3);
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rc = 1;
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done:
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OPENSSL_free(msg_mask);
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OPENSSL_free(x2y2);
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OPENSSL_free(C3);
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EVP_MD_CTX_free(hash);
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BN_CTX_free(ctx);
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EC_POINT_free(kG);
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EC_POINT_free(kP);
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return rc;
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}
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int SM2_decrypt(const EC_KEY *key,
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const EVP_MD *digest,
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const uint8_t *ciphertext,
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size_t ciphertext_len, uint8_t *ptext_buf, size_t *ptext_len)
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{
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int rc = 0;
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int i;
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BN_CTX *ctx = NULL;
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const EC_GROUP *group = EC_KEY_get0_group(key);
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EC_POINT *C1 = NULL;
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struct SM2_Ciphertext_st *sm2_ctext = NULL;
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BIGNUM *x2 = NULL;
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BIGNUM *y2 = NULL;
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uint8_t *x2y2 = NULL;
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uint8_t *computed_C3 = NULL;
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const size_t field_size = EC_field_size(group);
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const int hash_size = EVP_MD_size(digest);
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uint8_t *msg_mask = NULL;
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const uint8_t *C2 = NULL;
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const uint8_t *C3 = NULL;
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int msg_len = 0;
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EVP_MD_CTX *hash = NULL;
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if (field_size == 0 || hash_size == 0)
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goto done;
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memset(ptext_buf, 0xFF, *ptext_len);
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sm2_ctext = d2i_SM2_Ciphertext(NULL, &ciphertext, ciphertext_len);
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if (sm2_ctext == NULL)
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goto done;
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if (sm2_ctext->C3->length != hash_size)
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goto done;
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C2 = sm2_ctext->C2->data;
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C3 = sm2_ctext->C3->data;
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msg_len = sm2_ctext->C2->length;
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ctx = BN_CTX_new();
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if (ctx == NULL)
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goto done;
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BN_CTX_start(ctx);
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x2 = BN_CTX_get(ctx);
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y2 = BN_CTX_get(ctx);
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if(y2 == NULL)
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goto done;
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msg_mask = OPENSSL_zalloc(msg_len);
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x2y2 = OPENSSL_zalloc(2 * field_size);
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computed_C3 = OPENSSL_zalloc(hash_size);
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if(msg_mask == NULL || x2y2 == NULL || computed_C3 == NULL)
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goto done;
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C1 = EC_POINT_new(group);
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if (C1 == NULL)
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goto done;
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if (EC_POINT_set_affine_coordinates_GFp
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(group, C1, sm2_ctext->C1x, sm2_ctext->C1y, ctx) == 0)
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goto done;
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if (EC_POINT_mul(group, C1, NULL, C1, EC_KEY_get0_private_key(key), ctx) ==
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0)
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goto done;
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if (EC_POINT_get_affine_coordinates_GFp(group, C1, x2, y2, ctx) == 0)
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goto done;
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BN_bn2binpad(x2, x2y2, field_size);
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BN_bn2binpad(y2, x2y2 + field_size, field_size);
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if (ECDH_KDF_X9_62(msg_mask, msg_len, x2y2, 2 * field_size, NULL, 0, digest)
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== 0)
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goto done;
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for (i = 0; i != msg_len; ++i)
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ptext_buf[i] = C2[i] ^ msg_mask[i];
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hash = EVP_MD_CTX_new();
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if (hash == NULL)
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goto done;
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if (EVP_DigestInit(hash, digest) == 0)
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goto done;
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if (EVP_DigestUpdate(hash, x2y2, field_size) == 0)
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goto done;
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if (EVP_DigestUpdate(hash, ptext_buf, msg_len) == 0)
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goto done;
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if (EVP_DigestUpdate(hash, x2y2 + field_size, field_size) == 0)
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goto done;
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if (EVP_DigestFinal(hash, computed_C3, NULL) == 0)
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goto done;
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if (memcmp(computed_C3, C3, hash_size) != 0)
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goto done;
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rc = 1;
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*ptext_len = msg_len;
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done:
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if (rc == 0)
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memset(ptext_buf, 0, *ptext_len);
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OPENSSL_free(msg_mask);
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OPENSSL_free(x2y2);
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OPENSSL_free(computed_C3);
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EC_POINT_free(C1);
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BN_CTX_free(ctx);
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SM2_Ciphertext_free(sm2_ctext);
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EVP_MD_CTX_free(hash);
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return rc;
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}
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