GRASSHOPPER_CIPHER_CTR,
GRASSHOPPER_CIPHER_CTRACPKM,
GRASSHOPPER_CIPHER_CTRACPKMOMAC,
+ GRASSHOPPER_CIPHER_MGM,
};
static GOST_cipher grasshopper_template_cipher = {
.ctx_size = sizeof(gost_grasshopper_cipher_ctx_ctr),
};
+GOST_cipher grasshopper_mgm_cipher = {
+ .nid = NID_undef,
+ .template = &grasshopper_template_cipher,
+ .block_size = 1,
+ .iv_len = 16,
+ .flags = EVP_CIPH_NO_PADDING |
+ EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER |
+ EVP_CIPH_CTRL_INIT | EVP_CIPH_FLAG_AEAD_CIPHER,
+ .cleanup = gost_grasshopper_mgm_cleanup,
+ .ctrl = gost_grasshopper_mgm_ctrl,
+ .init = gost_grasshopper_cipher_init_mgm,
+ .do_cipher = gost_grasshopper_cipher_do_mgm,
+ .ctx_size = sizeof(gost_mgm_ctx)
+};
+
+static void kuznyechik_NID_callback (int nid)
+{
+ grasshopper_mgm_cipher.nid = nid;
+}
+
+GOST_NID_JOB kuznyechik_mgm_NID = {
+ .sn = SN_kuznyechik_mgm,
+ .ln = SN_kuznyechik_mgm,
+ .callback = kuznyechik_NID_callback,
+};
+
/* first 256 bit of D from draft-irtf-cfrg-re-keying-12 */
static const unsigned char ACPKM_D_2018[] = {
0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 64 bit */
return gost_grasshopper_cipher_init(ctx, key, iv, enc);
}
+// TODO: const *in, const *c
+void gost_grasshopper_encrypt_wrap(unsigned char *in, unsigned char *out,
+ gost_grasshopper_cipher_ctx *c) {
+ grasshopper_encrypt_block(&c->encrypt_round_keys,
+ (grasshopper_w128_t *) in,
+ (grasshopper_w128_t *) out,
+ &c->buffer);
+}
+
+
+
+/* ----------------------------------------------------------------------------------------------- */
+/*! Функция реализует операцию умножения двух элементов конечного поля \f$ \mathbb F_{2^{128}}\f$,
+ порожденного неприводимым многочленом
+ \f$ f(x) = x^{128} + x^7 + x^2 + x + 1 \in \mathbb F_2[x]\f$. Для умножения используется
+ простейшая реализация, основанная на приведении по модулю после каждого шага алгоритма. */
+/* ----------------------------------------------------------------------------------------------- */
+static void gf128_mul_uint64 (uint64_t *result, uint64_t *arg1, uint64_t *arg2)
+{
+ int i = 0;
+ register uint64_t t, X0, X1;
+ uint64_t Z0 = 0, Z1 = 0;
+
+#ifdef L_ENDIAN
+ X0 = BSWAP64(*(arg1 + 1));
+ X1 = BSWAP64(*arg1);
+#else
+ X0 = *(arg1 + 1);
+ X1 = *arg1;
+#endif
+
+ //first 64 bits of arg1
+#ifdef L_ENDIAN
+ t = BSWAP64(*(arg2 + 1));
+#else
+ t = *(arg2 + 1);
+#endif
+
+ for (i = 0; i < 64; i++) {
+ if (t & 0x1) {
+ Z0 ^= X0;
+ Z1 ^= X1;
+ }
+ t >>= 1;
+ if (X1 & 0x8000000000000000) {
+ X1 <<= 1;
+ X1 ^= X0>>63;
+ X0 <<= 1;
+ X0 ^= 0x87;
+ }
+ else {
+ X1 <<= 1;
+ X1 ^= X0>>63;
+ X0 <<= 1;
+ }
+ }
+
+ //second 64 bits of arg2
+#ifdef L_ENDIAN
+ t = BSWAP64(*arg2);
+#else
+ t = *arg2;
+#endif
+
+ for (i = 0; i < 63; i++) {
+ if (t & 0x1) {
+ Z0 ^= X0;
+ Z1 ^= X1;
+ }
+ t >>= 1;
+ if (X1 & 0x8000000000000000) {
+ X1 <<= 1;
+ X1 ^= X0>>63;
+ X0 <<= 1;
+ X0 ^= 0x87;
+ }
+ else {
+ X1 <<= 1;
+ X1 ^= X0>>63;
+ X0 <<= 1;
+ }
+ }
+
+ if (t & 0x1) {
+ Z0 ^= X0;
+ Z1 ^= X1;
+ }
+
+#ifdef L_ENDIAN
+ result[0] = BSWAP64(Z1);
+ result[1] = BSWAP64(Z0);
+#else
+ result[0] = Z1;
+ result[1] = Z0;
+#endif
+}
+
+static GRASSHOPPER_INLINE int
+gost_grasshopper_cipher_init_mgm(EVP_CIPHER_CTX *ctx, const unsigned char *key,
+ const unsigned char *iv, int enc)
+{
+ gost_mgm_ctx *mctx =
+ (gost_mgm_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
+ int bl;
+
+ if (!iv && !key)
+ return 1;
+ if (key) {
+ bl = EVP_CIPHER_CTX_iv_length(ctx);
+ gost_grasshopper_cipher_key(&mctx->ks.gh_ks, key);
+ gost_mgm128_init(&mctx->mgm, &mctx->ks,
+ (block128_f) gost_grasshopper_encrypt_wrap, gf128_mul_uint64, bl);
+
+ /*
+ * If we have an iv can set it directly, otherwise use saved IV.
+ */
+ if (iv == NULL && mctx->iv_set)
+ iv = mctx->iv;
+ if (iv) {
+ if (gost_mgm128_setiv(&mctx->mgm, iv, mctx->ivlen) != 1)
+ return 0;
+ mctx->iv_set = 1;
+ }
+ mctx->key_set = 1;
+ } else {
+ /* If key set use IV, otherwise copy */
+ if (mctx->key_set) {
+ if (gost_mgm128_setiv(&mctx->mgm, iv, mctx->ivlen) != 1)
+ return 0;
+ }
+ else
+ memcpy(mctx->iv, iv, mctx->ivlen);
+ mctx->iv_set = 1;
+ }
+ return 1;
+}
+
static int gost_grasshopper_cipher_do_ecb(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t inl)
{
return result;
}
+
+
+
+static int gost_grasshopper_cipher_do_mgm(EVP_CIPHER_CTX *ctx, unsigned char *out,
+ const unsigned char *in, size_t len)
+{
+ gost_mgm_ctx *mctx =
+ (gost_mgm_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
+ int enc = EVP_CIPHER_CTX_encrypting(ctx);
+
+ /* If not set up, return error */
+ if (!mctx->key_set) {
+ GOSTerr(GOST_F_GOST_GRASSHOPPER_CIPHER_DO_MGM,
+ GOST_R_BAD_ORDER);
+ return -1;
+ }
+
+ if (!mctx->iv_set) {
+ GOSTerr(GOST_F_GOST_GRASSHOPPER_CIPHER_DO_MGM,
+ GOST_R_BAD_ORDER);
+ return -1;
+ }
+ if (in) {
+ if (out == NULL) {
+ if (gost_mgm128_aad(&mctx->mgm, in, len))
+ return -1;
+ } else if (enc) {
+ if (gost_mgm128_encrypt(&mctx->mgm, in, out, len))
+ return -1;
+ } else {
+ if (gost_mgm128_decrypt(&mctx->mgm, in, out, len))
+ return -1;
+ }
+ return len;
+ } else {
+ if (!enc) {
+ if (mctx->taglen < 0)
+ return -1;
+ if (gost_mgm128_finish(&mctx->mgm,
+ EVP_CIPHER_CTX_buf_noconst(ctx),
+ mctx->taglen) != 0)
+ return -1;
+ mctx->iv_set = 0;
+ return 0;
+ }
+ gost_mgm128_tag(&mctx->mgm, EVP_CIPHER_CTX_buf_noconst(ctx), 16);
+ mctx->taglen = 16;
+ /* Don't reuse the IV */
+ mctx->iv_set = 0;
+ return 0;
+ }
+
+}
+
/*
* Fixed 128-bit IV implementation make shift regiser redundant.
*/
return 0;
}
+static int gost_grasshopper_mgm_cleanup(EVP_CIPHER_CTX *c)
+{
+ gost_mgm_ctx *mctx =
+ (gost_mgm_ctx *)EVP_CIPHER_CTX_get_cipher_data(c);
+ if (mctx == NULL)
+ return 0;
+ gost_grasshopper_cipher_destroy(&mctx->ks.gh_ks);
+ OPENSSL_cleanse(&mctx->mgm, sizeof(mctx->mgm));
+ if (mctx->iv != EVP_CIPHER_CTX_iv_noconst(c))
+ OPENSSL_free(mctx->iv);
+ return 1;
+}
+
+static int gost_grasshopper_mgm_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
+{
+ gost_mgm_ctx *mctx =
+ (gost_mgm_ctx *)EVP_CIPHER_CTX_get_cipher_data(c);
+ unsigned char *buf, *iv;
+ int ivlen, enc;
+
+ switch (type) {
+ case EVP_CTRL_INIT:
+ ivlen = EVP_CIPHER_iv_length(EVP_CIPHER_CTX_cipher(c));
+ iv = EVP_CIPHER_CTX_iv_noconst(c);
+ mctx->key_set = 0;
+ mctx->iv_set = 0;
+ mctx->ivlen = ivlen;
+ mctx->iv = iv;
+ mctx->taglen = -1;
+ return 1;
+
+ case EVP_CTRL_GET_IVLEN:
+ *(int *)ptr = mctx->ivlen;
+ return 1;
+
+ case EVP_CTRL_AEAD_SET_IVLEN:
+ if (arg <= 0)
+ return 0;
+ if ((arg > EVP_MAX_IV_LENGTH) && (arg > mctx->ivlen)) {
+ // TODO: Allocate memory for IV or set error
+ return 0;
+ }
+ mctx->ivlen = arg;
+ return 1;
+
+ case EVP_CTRL_AEAD_SET_TAG:
+ buf = EVP_CIPHER_CTX_buf_noconst(c);
+ enc = EVP_CIPHER_CTX_encrypting(c);
+ if (arg <= 0 || arg != 16 || enc) {
+ GOSTerr(GOST_F_GOST_GRASSHOPPER_MGM_CTRL,
+ GOST_R_INVALID_TAG_LENGTH);
+ return 0;
+ }
+ memcpy(buf, ptr, arg);
+ mctx->taglen = arg;
+ return 1;
+
+ case EVP_CTRL_AEAD_GET_TAG:
+ buf = EVP_CIPHER_CTX_buf_noconst(c);
+ enc = EVP_CIPHER_CTX_encrypting(c);
+ if (arg <= 0 || arg > 16 || !enc || mctx->taglen < 0) {
+ GOSTerr(GOST_F_GOST_GRASSHOPPER_MGM_CTRL,
+ GOST_R_INVALID_TAG_LENGTH);
+ return 0;
+ }
+ memcpy(ptr, buf, arg);
+ return 1;
+
+ default:
+ return -1;
+ }
+}
+
static int gost_grasshopper_cipher_ctl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
{
switch (type) {
c->section_size = arg;
break;
}
-#ifdef EVP_CTRL_TLS1_2_TLSTREE
- case EVP_CTRL_TLS1_2_TLSTREE:
+ case EVP_CTRL_TLSTREE:
{
unsigned char newkey[32];
int mode = EVP_CIPHER_CTX_mode(ctx);
- static const unsigned char zeroseq[8];
gost_grasshopper_cipher_ctx_ctr *ctr_ctx = NULL;
gost_grasshopper_cipher_ctx *c = NULL;
unsigned char adjusted_iv[16];
unsigned char seq[8];
- int j, carry;
+ int j, carry, decrement_arg;
if (mode != EVP_CIPH_CTR_MODE)
- return -1;
+ return -1;
ctr_ctx = (gost_grasshopper_cipher_ctx_ctr *)
- EVP_CIPHER_CTX_get_cipher_data(ctx);
+ EVP_CIPHER_CTX_get_cipher_data(ctx);
c = &(ctr_ctx->c);
+ /*
+ * 'arg' parameter indicates what we should do with sequence value.
+ *
+ * When function called, seq is incremented after MAC calculation.
+ * In ETM mode, we use seq 'as is' in the ctrl-function (arg = 0)
+ * Otherwise we have to decrease it in the implementation (arg = 1).
+ */
memcpy(seq, ptr, 8);
- if (EVP_CIPHER_CTX_encrypting(ctx)) {
- /*
- * OpenSSL increments seq after mac calculation.
- * As we have Mac-Then-Encrypt, we need decrement it here on encryption
- * to derive the key correctly.
- * */
- if (memcmp(seq, zeroseq, 8) != 0)
- {
- for(j=7; j>=0; j--)
- {
- if (seq[j] != 0) {seq[j]--; break;}
- else seq[j] = 0xFF;
- }
- }
+ decrement_arg = arg;
+ if (!decrement_sequence(seq, decrement_arg))
+ {
+ GOSTerr(GOST_F_GOST_GRASSHOPPER_CIPHER_CTL, GOST_R_CTRL_CALL_FAILED);
+ return -1;
}
+
if (gost_tlstree(NID_grasshopper_cbc, c->master_key.k.b, newkey,
(const unsigned char *)seq) > 0) {
memset(adjusted_iv, 0, 16);
}
}
return -1;
-#endif
#if 0
case EVP_CTRL_AEAD_GET_TAG:
case EVP_CTRL_AEAD_SET_TAG:
return gost2015_process_unprotected_attributes(x, arg, KUZNYECHIK_MAC_MAX_SIZE, c->tag);
}
- return 1;
case EVP_CTRL_COPY: {
EVP_CIPHER_CTX *out = ptr;
}
/* Called directly by CMAC_ACPKM_Init() */
-const GRASSHOPPER_INLINE EVP_CIPHER *cipher_gost_grasshopper_ctracpkm()
+const EVP_CIPHER *cipher_gost_grasshopper_ctracpkm()
{
return GOST_init_cipher(&grasshopper_ctr_acpkm_cipher);
}
projects / openssl-gost / engine.git / blobdiff