#include <openssl/evp.h>
#include <openssl/rand.h>
#include <openssl/err.h>
+
#include <string.h>
+#include <byteswap.h>
#include "gost_lcl.h"
#include "e_gost_err.h"
GRASSHOPPER_CIPHER_CFB,
GRASSHOPPER_CIPHER_CTR,
GRASSHOPPER_CIPHER_CTRACPKM,
+ GRASSHOPPER_CIPHER_MGM,
};
-static EVP_CIPHER *gost_grasshopper_ciphers[6] = {
+static EVP_CIPHER *gost_grasshopper_ciphers[7] = {
[GRASSHOPPER_CIPHER_ECB] = NULL,
[GRASSHOPPER_CIPHER_CBC] = NULL,
[GRASSHOPPER_CIPHER_OFB] = NULL,
[GRASSHOPPER_CIPHER_CFB] = NULL,
[GRASSHOPPER_CIPHER_CTR] = NULL,
[GRASSHOPPER_CIPHER_CTRACPKM] = NULL,
+ [GRASSHOPPER_CIPHER_MGM] = NULL,
};
static GRASSHOPPER_INLINE void
gost_grasshopper_cipher_destroy_ofb(gost_grasshopper_cipher_ctx * c);
static GRASSHOPPER_INLINE void
gost_grasshopper_cipher_destroy_ctr(gost_grasshopper_cipher_ctx * c);
+static GRASSHOPPER_INLINE void
+gost_grasshopper_cipher_destroy_mgm(gost_grasshopper_cipher_ctx * c);
struct GRASSHOPPER_CIPHER_PARAMS {
int nid;
bool padding;
};
-static struct GRASSHOPPER_CIPHER_PARAMS gost_cipher_params[6] = {
+static struct GRASSHOPPER_CIPHER_PARAMS gost_cipher_params[7] = {
[GRASSHOPPER_CIPHER_ECB] = {
NID_grasshopper_ecb,
gost_grasshopper_cipher_init_ecb,
16,
false}
,
+#ifdef NID_kuznyechik_mgm
+ [GRASSHOPPER_CIPHER_MGM] = {
+ NID_kuznyechik_mgm,
+ gost_grasshopper_cipher_init_mgm,
+ gost_grasshopper_cipher_do_mgm,
+ gost_grasshopper_cipher_destroy_mgm,
+ 1,
+ sizeof(gost_grasshopper_cipher_ctx_mgm),
+ 16,
+ false}
+ ,
+#else
+ [GRASSHOPPER_CIPHER_MGM] = {
+ NID_undef,
+ NULL,
+ NULL,
+ NULL,
+ 0,
+ 0,
+ 0,
+ false}
+ ,
+#endif
};
/* first 256 bit of D from draft-irtf-cfrg-re-keying-12 */
grasshopper_zero128(&ctx->partial_buffer);
}
+static GRASSHOPPER_INLINE void
+gost_grasshopper_cipher_destroy_mgm(gost_grasshopper_cipher_ctx * c)
+{
+ gost_grasshopper_cipher_ctx_mgm *ctx =
+ (gost_grasshopper_cipher_ctx_mgm *) c;
+
+ grasshopper_zero128(&ctx->partial_buffer);
+}
+
int gost_grasshopper_cipher_init(EVP_CIPHER_CTX *ctx,
const unsigned char *key,
const unsigned char *iv, int enc)
}
if (iv != NULL) {
+ if (c->type == GRASSHOPPER_CIPHER_MGM) {
+ gost_grasshopper_cipher_ctx_mgm *m = (gost_grasshopper_cipher_ctx_mgm *)c;
+
+ /* 1st bit should be 0*/
+ if (iv[0] > 127) {
+ GOSTerr(GOST_F_GOST_GRASSHOPPER_CIPHER_INIT, GOST_R_INVALID_IV_LENGTH);
+ return 0;
+ }
+ memcpy(m->mgm_iv, iv, 16);
+ *(unsigned char *)(m->mgm_iv) += 128;
+ }
memcpy((unsigned char *)EVP_CIPHER_CTX_original_iv(ctx), iv,
EVP_CIPHER_CTX_iv_length(ctx));
}
return gost_grasshopper_cipher_init(ctx, key, iv, enc);
}
+GRASSHOPPER_INLINE int gost_grasshopper_cipher_init_mgm(EVP_CIPHER_CTX *ctx, const unsigned char
+ *key, const unsigned char
+ *iv, int enc)
+{
+ gost_grasshopper_cipher_ctx_mgm *c = EVP_CIPHER_CTX_get_cipher_data(ctx);
+
+ c->c.type = GRASSHOPPER_CIPHER_MGM;
+ c->taglen = 16;
+ EVP_CIPHER_CTX_set_num(ctx, 0);
+
+ grasshopper_zero128(&c->partial_buffer);
+
+ return gost_grasshopper_cipher_init(ctx, key, iv, enc);
+}
+
GRASSHOPPER_INLINE int gost_grasshopper_cipher_do(EVP_CIPHER_CTX *ctx,
unsigned char *out,
const unsigned char *in,
return 1;
}
+/* ----------------------------------------------------------------------------------------------- */
+/*! 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 *z, uint64_t *x, uint64_t *y)
+{
+ int i = 0, n = 0;
+ uint64_t t, s0, s1;
+
+ BUF_reverse((unsigned char *)x, NULL, 16);
+ BUF_reverse((unsigned char *)y, NULL, 16);
+
+#ifdef L_ENDIAN
+ s0 = x[0];
+ s1 = x[1];
+#else
+ s0 = bswap_64(x[0]);
+ s1 = bswap_64(x[1]);
+#endif
+
+ memset(z, 0, sizeof(uint64_t)*2);
+
+ /* lower half */
+#ifdef L_ENDIAN
+ t = y[0];
+#else
+ t = bswap_64(y[0]);
+#endif
+
+ for( i = 0; i < 64; i++ ) {
+ if( t&0x1 ) { z[0] ^= s0; z[1] ^= s1; }
+ t >>= 1;
+ n = s1 >> 63;
+ s1 <<= 1; s1 ^= ( s0 >> 63 ); s0 <<= 1;
+ if(n) s0 ^= 0x87;
+ }
+
+ /* upper half */
+#ifdef L_ENDIAN
+ t = y[1];
+#else
+ t = bswap_64(y[1]);
+#endif
+
+ for( i = 0; i < 63; i++ ) {
+ if( t&0x1 ) { z[0] ^= s0; z[1] ^= s1; }
+ t >>= 1;
+ n = s1 >> 63;
+ s1 <<= 1; s1 ^= ( s0 >> 63 ); s0 <<= 1;
+ if( n ) s0 ^= 0x87;
+ }
+
+ if( t&0x1 ) {
+ z[0] ^= s0;
+ z[1] ^= s1;
+ }
+#ifndef L_ENDIAN
+ z[0] = bswap_64(z[0]);
+ z[1] = bswap_64(z[1]);
+#endif
+ BUF_reverse((unsigned char *)z, NULL, 16);
+}
+
+static void hexdump(FILE *f, const char *title, const unsigned char *s, int l)
+{
+ int n = 0;
+
+ fprintf(f, "%s", title);
+ for (; n < l; ++n) {
+ if ((n % 16) == 0)
+ fprintf(f, "\n%04x", n);
+ fprintf(f, " %02x", s[n]);
+ }
+ fprintf(f, "\n");
+}
+
+int gost_grasshopper_cipher_do_mgm(EVP_CIPHER_CTX *ctx, unsigned char *out,
+ const unsigned char *in, size_t inl)
+{
+ gost_grasshopper_cipher_ctx_mgm *c = (gost_grasshopper_cipher_ctx_mgm *)
+ EVP_CIPHER_CTX_get_cipher_data(ctx);
+ unsigned char *iv = EVP_CIPHER_CTX_iv_noconst(ctx);
+ const unsigned char *current_in = in;
+ unsigned char *current_out = out;
+ grasshopper_w128_t *currentInputBlock;
+ grasshopper_w128_t *currentOutputBlock;
+ unsigned int n = EVP_CIPHER_CTX_num(ctx);
+ size_t lasted;
+ size_t i;
+
+ size_t blocks = inl / GRASSHOPPER_BLOCK_SIZE;
+ int rest_len = n % GRASSHOPPER_BLOCK_SIZE;
+ grasshopper_w128_t h;
+
+ grasshopper_w128_t *iv_buffer = (grasshopper_w128_t *) iv;
+ grasshopper_w128_t tmp;
+
+/* ======== Here we deal with associated data =========== */
+ if (out == NULL && c->mgm_state == mgm_associated_data) {
+ if (n == 0) {
+ grasshopper_encrypt_block(&c->c.encrypt_round_keys, c->mgm_iv,
+ &c->partial_buffer, &c->c.buffer);
+ memcpy(c->mgm_iv, &c->partial_buffer, GRASSHOPPER_BLOCK_SIZE);
+ hexdump(stderr, "Tag", c->tag, 16);
+ }
+
+ if (rest_len != 0) {
+ /* Finalize partial_data */
+ if (inl + rest_len < GRASSHOPPER_BLOCK_SIZE) {
+ memcpy(c->mgm_partial_buffer.b+rest_len, current_in, inl);
+ n += inl;
+ EVP_CIPHER_CTX_set_num(ctx, n);
+ return 1;
+ } else {
+ memcpy(c->mgm_partial_buffer.b+rest_len, current_in, GRASSHOPPER_BLOCK_SIZE - rest_len);
+
+ grasshopper_encrypt_block(&c->c.encrypt_round_keys, c->mgm_iv,
+ &h, &c->c.buffer);
+ inc_counter(c->mgm_iv->b, 8);
+
+ hexdump(stderr, "Hnext", h.b, 16);
+ hexdump(stderr, "Adata", c->mgm_partial_buffer.b, 16);
+ /* Galois multiply Hi * Ai */
+ gf128_mul_uint64(tmp.q, h.q, c->mgm_partial_buffer.q);
+
+ /* XOR to c->tag */
+ grasshopper_plus128(&h, (grasshopper_w128_t *)c->tag, &tmp);
+ grasshopper_copy128((grasshopper_w128_t *)c->tag, &h);
+ hexdump(stderr, "Tag", c->tag, 16);
+
+ current_in += GRASSHOPPER_BLOCK_SIZE - rest_len;
+ inl -= (GRASSHOPPER_BLOCK_SIZE - rest_len);
+ n += GRASSHOPPER_BLOCK_SIZE - rest_len;
+ }
+ }
+
+ while (inl >= GRASSHOPPER_BLOCK_SIZE) {
+ currentInputBlock = (grasshopper_w128_t *) current_in;
+
+ grasshopper_encrypt_block(&c->c.encrypt_round_keys, c->mgm_iv,
+ &h, &c->c.buffer);
+ inc_counter(c->mgm_iv->b, 8);
+
+ hexdump(stderr, "Hnext", h.b, 16);
+ hexdump(stderr, "Adata", currentInputBlock->b, 16);
+ /* Galois multiply */
+ gf128_mul_uint64(tmp.q, h.q, currentInputBlock->q);
+
+ /* XOR to c->tag */
+ grasshopper_plus128(&h, (grasshopper_w128_t *)c->tag, &tmp);
+ grasshopper_copy128((grasshopper_w128_t *)c->tag, &h);
+ hexdump(stderr, "Tag", c->tag, 16);
+
+ current_in += GRASSHOPPER_BLOCK_SIZE;
+ inl -= GRASSHOPPER_BLOCK_SIZE;
+ n += GRASSHOPPER_BLOCK_SIZE;
+ }
+
+ if (inl > 0)
+ {
+ memcpy(c->mgm_partial_buffer.b, current_in, inl);
+ n += inl;
+ }
+
+ EVP_CIPHER_CTX_set_num(ctx, n);
+ return 1;
+ }
+
+ if (out == NULL && in != NULL && inl !=0 && c->mgm_state == mgm_main_data) {
+ GOSTerr(GOST_F_GOST_GRASSHOPPER_CIPHER_DO_MGM, GOST_R_BAD_ORDER);
+ return 0;
+ }
+
+ if (out != NULL && c->mgm_state == mgm_associated_data) {
+ memset(c->mgm_partial_buffer.b+rest_len, 0, GRASSHOPPER_BLOCK_SIZE - rest_len);
+
+ grasshopper_encrypt_block(&c->c.encrypt_round_keys, c->mgm_iv,
+ &h, &c->c.buffer);
+ inc_counter(c->mgm_iv->b, 8);
+
+ hexdump(stderr, "Hnext", h.b, 16);
+ hexdump(stderr, "Padded Adata", c->mgm_partial_buffer.b, 16);
+ /* Galois multiply Hi * Ai */
+ gf128_mul_uint64(tmp.q, h.q, c->mgm_partial_buffer.q);
+
+ /* XOR to c->tag */
+ grasshopper_plus128(&h, (grasshopper_w128_t *)c->tag, &tmp);
+ grasshopper_copy128((grasshopper_w128_t *)c->tag, &h);
+ hexdump(stderr, "Tag", c->tag, 16);
+
+ /* We finish processing associated data */
+ /* Pad rest of mgm_partial_buffer */
+ /* Process last block */
+ c->ad_length = n;
+ n = 0;
+ EVP_CIPHER_CTX_set_num(ctx, 0);
+ c->mgm_state = mgm_main_data;
+
+ fprintf(stderr, "============= Deal with main data\n");
+ }
+
+/* ======== Here we deal with main data =========== */
+ if (n == 0) {
+ /* actual IV derived from nonce */
+ grasshopper_encrypt_block(&c->c.encrypt_round_keys, iv_buffer,
+ &c->partial_buffer, &c->c.buffer);
+ memcpy(iv, c->partial_buffer.b, GRASSHOPPER_BLOCK_SIZE);
+ //hexdump(stderr, "Y1", iv, 16);
+ }
+
+ while (rest_len && inl) {
+ *(current_out++) = *(current_in++) ^ c->partial_buffer.b[rest_len];
+ --inl;
+ n++;
+ rest_len++;
+ if (rest_len == GRASSHOPPER_BLOCK_SIZE)
+ {
+ rest_len = 0;
+ }
+ }
+ EVP_CIPHER_CTX_set_num(ctx, n);
+
+ // full parts
+ for (i = 0; i < blocks; i++) {
+ currentInputBlock = (grasshopper_w128_t *) current_in;
+ currentOutputBlock = (grasshopper_w128_t *) current_out;
+ grasshopper_encrypt_block(&c->c.encrypt_round_keys, iv_buffer,
+ &c->partial_buffer, &c->c.buffer);
+ grasshopper_plus128(&tmp, &c->partial_buffer, currentInputBlock);
+ grasshopper_copy128(currentOutputBlock, &tmp);
+ //hexdump(stderr, "Ciphertext", currentOutputBlock->b, 16);
+
+ grasshopper_encrypt_block(&c->c.encrypt_round_keys, c->mgm_iv,
+ &h, &c->c.buffer);
+ inc_counter(c->mgm_iv->b, 8);
+ hexdump(stderr, "Hnext", h.b, 16);
+ hexdump(stderr, "Ciphertext", currentOutputBlock->b, 16);
+ /* Galois multiply Hi * Ai */
+ gf128_mul_uint64(tmp.q, h.q, currentOutputBlock->q);
+
+ /* XOR to c->tag */
+ grasshopper_plus128(&h, (grasshopper_w128_t *)c->tag, &tmp);
+ grasshopper_copy128((grasshopper_w128_t *)c->tag, &h);
+ hexdump(stderr, "Tag", c->tag, 16);
+
+ ctr128_inc(iv_buffer->b);
+ current_in += GRASSHOPPER_BLOCK_SIZE;
+ current_out += GRASSHOPPER_BLOCK_SIZE;
+ n += GRASSHOPPER_BLOCK_SIZE;
+ }
+
+ // last part
+ lasted = inl - blocks * GRASSHOPPER_BLOCK_SIZE;
+ if (lasted > 0) {
+ currentInputBlock = (grasshopper_w128_t *) current_in;
+ currentOutputBlock = (grasshopper_w128_t *) current_out;
+ grasshopper_encrypt_block(&c->c.encrypt_round_keys, iv_buffer,
+ &c->partial_buffer, &c->c.buffer);
+ for (i = 0; i < lasted; i++) {
+ currentOutputBlock->b[i] =
+ c->partial_buffer.b[i] ^ currentInputBlock->b[i];
+ }
+ grasshopper_copy128(&c->partial_buffer, currentOutputBlock);
+ EVP_CIPHER_CTX_set_num(ctx, n+i);
+ ctr128_inc(iv_buffer->b);
+ }
+
+ /* Final step */
+ if (in == NULL && inl == 0)
+ {
+ unsigned char len_buf[16];
+ uint64_t a_len = 0, p_len = 0;
+
+ if (rest_len != 0)
+ {
+ memset(c->partial_buffer.b+rest_len, 0, GRASSHOPPER_BLOCK_SIZE - rest_len);
+ grasshopper_encrypt_block(&c->c.encrypt_round_keys, c->mgm_iv,
+ &h, &c->c.buffer);
+ inc_counter(c->mgm_iv->b, 8);
+ hexdump(stderr, "Hnext", h.b, 16);
+ hexdump(stderr, "Padded ciphertext", c->partial_buffer.b, 16);
+ /* Galois multiply Hi * Ai */
+ gf128_mul_uint64(tmp.q, h.q, c->partial_buffer.q);
+
+ /* XOR to c->tag */
+ grasshopper_plus128(&h, (grasshopper_w128_t *)c->tag, &tmp);
+ grasshopper_copy128((grasshopper_w128_t *)c->tag, &h);
+ hexdump(stderr, "Tag", c->tag, 16);
+ }
+
+ a_len = c->ad_length << 3;
+ p_len = (c->mgm_state == mgm_associated_data) ? 0 : n << 3;
+
+#ifdef L_ENDIAN
+ a_len = bswap_64(a_len);
+ p_len = bswap_64(p_len);
+#endif
+ memset(len_buf, 0, 16);
+
+ memcpy(len_buf, &a_len, sizeof(a_len));
+ memcpy(len_buf+sizeof(a_len), &p_len, sizeof(p_len));
+ grasshopper_encrypt_block(&c->c.encrypt_round_keys, c->mgm_iv,
+ &h, &c->c.buffer);
+
+ hexdump(stderr, "Hlast", h.b, 16);
+ hexdump(stderr, "Lenbuf", len_buf, 16);
+ /* Galois multiply Hi * Ai */
+ gf128_mul_uint64(tmp.q, h.q, (uint64_t *)len_buf);
+
+ /* XOR to c->tag */
+ grasshopper_plus128(&h, (grasshopper_w128_t *)c->tag, &tmp);
+ grasshopper_copy128((grasshopper_w128_t *)c->tag, &h);
+ hexdump(stderr, "Tag", c->tag, 16);
+
+ /* Final tag calculation */
+ grasshopper_encrypt_block(&c->c.encrypt_round_keys, (grasshopper_w128_t *)c->tag,
+ (grasshopper_w128_t *)c->final_tag, &c->c.buffer);
+ }
+
+ return 1;
+}
+
/*
* Fixed 128-bit IV implementation make shift regiser redundant.
*/
}
return -1;
#endif
+ case EVP_CTRL_AEAD_GET_TAG:
+ case EVP_CTRL_AEAD_SET_TAG:
+ {
+ gost_grasshopper_cipher_ctx_mgm *mgm_ctx = NULL;
+ gost_grasshopper_cipher_ctx *c = NULL;
+ int taglen = arg;
+ unsigned char* tag = ptr;
+
+ mgm_ctx = (gost_grasshopper_cipher_ctx_mgm *)
+ EVP_CIPHER_CTX_get_cipher_data(ctx);
+ c = (gost_grasshopper_cipher_ctx *)mgm_ctx;
+
+ if (c->type != GRASSHOPPER_CIPHER_MGM)
+ return -1;
+
+ if (taglen > 16) {
+ GOSTerr(GOST_F_GOST_GRASSHOPPER_CIPHER_CTL, GOST_R_INVALID_TAG_LENGTH);
+ return -1;
+ }
+
+ if (type == EVP_CTRL_AEAD_GET_TAG)
+ memcpy(tag, mgm_ctx->final_tag, taglen);
+ else
+ memcpy(mgm_ctx->final_tag, tag, taglen);
+
+ return 1;
+ }
default:
GOSTerr(GOST_F_GOST_GRASSHOPPER_CIPHER_CTL,
GOST_R_UNSUPPORTED_CIPHER_CTL_COMMAND);
}
const int cipher_gost_grasshopper_setup(EVP_CIPHER *cipher, uint8_t mode,
- int iv_size, bool padding)
+ int iv_size, bool padding, int extra_flags)
{
return EVP_CIPHER_meth_set_iv_length(cipher, iv_size)
&& EVP_CIPHER_meth_set_flags(cipher,
EVP_CIPH_CUSTOM_IV
: 0) |
EVP_CIPH_RAND_KEY |
- EVP_CIPH_ALWAYS_CALL_INIT)
+ EVP_CIPH_ALWAYS_CALL_INIT | extra_flags)
)
&& EVP_CIPHER_meth_set_cleanup(cipher, gost_grasshopper_cipher_cleanup)
&& EVP_CIPHER_meth_set_set_asn1_params(cipher,
int iv_size = params->iv_size;
bool padding = params->padding;
+ int extra_flags = (num == GRASSHOPPER_CIPHER_MGM) ?
+ EVP_CIPH_FLAG_CUSTOM_CIPHER | EVP_CIPH_FLAG_AEAD_CIPHER : 0;
+
*cipher = cipher_gost_grasshopper_create(nid, block_size);
if (*cipher == NULL) {
return NULL;
}
- if (!cipher_gost_grasshopper_setup(*cipher, mode, iv_size, padding)
+ if (!cipher_gost_grasshopper_setup(*cipher, mode, iv_size, padding, extra_flags)
|| !EVP_CIPHER_meth_set_init(*cipher, init_cipher)
|| !EVP_CIPHER_meth_set_impl_ctx_size(*cipher, ctx_size)) {
EVP_CIPHER_meth_free(*cipher);
GRASSHOPPER_CIPHER_CTRACPKM);
}
+const GRASSHOPPER_INLINE EVP_CIPHER *cipher_gost_grasshopper_mgm()
+{
+#ifndef NID_kuznyechik_mgm
+ return NULL;
+#else
+ return cipher_gost_grasshopper(EVP_CIPH_CTR_MODE, GRASSHOPPER_CIPHER_MGM);
+#endif
+}
+
void cipher_gost_grasshopper_destroy(void)
{
EVP_CIPHER_meth_free(gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_ECB]);
gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_CTR] = NULL;
EVP_CIPHER_meth_free(gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_CTRACPKM]);
gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_CTRACPKM] = NULL;
+ EVP_CIPHER_meth_free(gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_MGM]);
+ gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_MGM] = NULL;
}
projects / openssl-gost / engine.git / blobdiff