--- /dev/null
+/*
+ * Maxim Tishkov 2016
+ * This file is distributed under the same license as OpenSSL
+ */
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+#include "gost_grasshopper_cipher.h"
+#include "gost_grasshopper_defines.h"
+#include "gost_grasshopper_math.h"
+#include "gost_grasshopper_core.h"
+
+#include <openssl/evp.h>
+#include <openssl/rand.h>
+#include <openssl/err.h>
+#include <string.h>
+
+#include "e_gost_err.h"
+
+enum GRASSHOPPER_CIPHER_TYPE {
+ GRASSHOPPER_CIPHER_ECB = 0,
+ GRASSHOPPER_CIPHER_CBC,
+ GRASSHOPPER_CIPHER_OFB,
+ GRASSHOPPER_CIPHER_CFB,
+ GRASSHOPPER_CIPHER_CTR
+};
+
+static EVP_CIPHER* gost_grasshopper_ciphers[5] = {
+ [GRASSHOPPER_CIPHER_ECB] = NULL,
+ [GRASSHOPPER_CIPHER_CBC] = NULL,
+ [GRASSHOPPER_CIPHER_OFB] = NULL,
+ [GRASSHOPPER_CIPHER_CFB] = NULL,
+ [GRASSHOPPER_CIPHER_CTR] = 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);
+
+struct GRASSHOPPER_CIPHER_PARAMS {
+ int nid;
+ grasshopper_init_cipher_func init_cipher;
+ grasshopper_do_cipher_func do_cipher;
+ grasshopper_destroy_cipher_func destroy_cipher;
+ int block_size;
+ int ctx_size;
+ int iv_size;
+ bool padding;
+};
+
+static struct GRASSHOPPER_CIPHER_PARAMS gost_cipher_params[5] = {
+ [GRASSHOPPER_CIPHER_ECB] = {
+ NID_grasshopper_ecb,
+ gost_grasshopper_cipher_init_ecb,
+ gost_grasshopper_cipher_do_ecb,
+ NULL,
+ 16,
+ sizeof(gost_grasshopper_cipher_ctx),
+ 0,
+ true
+ },
+ [GRASSHOPPER_CIPHER_CBC] = {
+ NID_grasshopper_cbc,
+ gost_grasshopper_cipher_init_cbc,
+ gost_grasshopper_cipher_do_cbc,
+ NULL,
+ 16,
+ sizeof(gost_grasshopper_cipher_ctx),
+ 16,
+ true
+ },
+ [GRASSHOPPER_CIPHER_OFB] = {
+ NID_grasshopper_ofb,
+ gost_grasshopper_cipher_init_ofb,
+ gost_grasshopper_cipher_do_ofb,
+ gost_grasshopper_cipher_destroy_ofb,
+ 1,
+ sizeof(gost_grasshopper_cipher_ctx_ofb),
+ 16,
+ false
+ },
+ [GRASSHOPPER_CIPHER_CFB] = {
+ NID_grasshopper_cfb,
+ gost_grasshopper_cipher_init_cfb,
+ gost_grasshopper_cipher_do_cfb,
+ NULL,
+ 1,
+ sizeof(gost_grasshopper_cipher_ctx),
+ 16,
+ false
+ },
+ [GRASSHOPPER_CIPHER_CTR] = {
+ NID_grasshopper_ctr,
+ gost_grasshopper_cipher_init_ctr,
+ gost_grasshopper_cipher_do_ctr,
+ gost_grasshopper_cipher_destroy_ctr,
+ 1,
+ sizeof(gost_grasshopper_cipher_ctx),
+ 8,
+ false
+ },
+};
+
+/* Set 256 bit key into context */
+static GRASSHOPPER_INLINE void gost_grasshopper_cipher_key(gost_grasshopper_cipher_ctx* c, const uint8_t* k) {
+ for (int i = 0; i < 2; i++) {
+ grasshopper_copy128(&c->key.k.k[i], (const grasshopper_w128_t*) (k + i * 16));
+ }
+ grasshopper_set_encrypt_key(&c->encrypt_round_keys, &c->key);
+ grasshopper_set_decrypt_key(&c->decrypt_round_keys, &c->key);
+}
+
+/* Cleans up key from context */
+static GRASSHOPPER_INLINE void gost_grasshopper_cipher_destroy(gost_grasshopper_cipher_ctx* c) {
+ for (int i = 0; i < 2; i++) {
+ grasshopper_zero128(&c->key.k.k[i]);
+ }
+ for (int i = 0; i < GRASSHOPPER_ROUND_KEYS_COUNT; i++) {
+ grasshopper_zero128(&c->encrypt_round_keys.k[i]);
+ }
+ for (int i = 0; i < GRASSHOPPER_ROUND_KEYS_COUNT; i++) {
+ grasshopper_zero128(&c->decrypt_round_keys.k[i]);
+ }
+ grasshopper_zero128(&c->buffer);
+}
+
+static GRASSHOPPER_INLINE void gost_grasshopper_cipher_destroy_ofb(gost_grasshopper_cipher_ctx* c) {
+ gost_grasshopper_cipher_ctx_ofb* ctx = (gost_grasshopper_cipher_ctx_ofb*) c;
+
+ grasshopper_zero128(&ctx->buffer1);
+}
+
+static GRASSHOPPER_INLINE void gost_grasshopper_cipher_destroy_ctr(gost_grasshopper_cipher_ctx* c) {
+ gost_grasshopper_cipher_ctx_ctr* ctx = (gost_grasshopper_cipher_ctx_ctr*) c;
+
+ grasshopper_zero128(&ctx->iv_buffer);
+ grasshopper_zero128(&ctx->partial_buffer);
+
+ ctx->counter = 0;
+}
+
+static int gost_grasshopper_cipher_init(EVP_CIPHER_CTX* ctx, const unsigned char* key,
+ const unsigned char* iv, int enc) {
+ gost_grasshopper_cipher_ctx* c = EVP_CIPHER_CTX_cipher_data(ctx);
+
+ if (EVP_CIPHER_CTX_get_app_data(ctx) == NULL) {
+ EVP_CIPHER_CTX_set_app_data(ctx, EVP_CIPHER_CTX_cipher_data(ctx));
+ }
+
+ if (key != NULL) {
+ gost_grasshopper_cipher_key(c, key);
+ }
+
+ if (iv != NULL) {
+ memcpy((unsigned char*) EVP_CIPHER_CTX_original_iv(ctx), iv,
+ EVP_CIPHER_CTX_iv_length(ctx));
+ }
+
+ memcpy(EVP_CIPHER_CTX_iv_noconst(ctx),
+ EVP_CIPHER_CTX_original_iv(ctx),
+ EVP_CIPHER_CTX_iv_length(ctx));
+
+ grasshopper_zero128(&c->buffer);
+
+ return 1;
+}
+
+static GRASSHOPPER_INLINE int gost_grasshopper_cipher_init_ecb(EVP_CIPHER_CTX* ctx, const unsigned char* key,
+ const unsigned char* iv,
+ int enc) {
+ gost_grasshopper_cipher_ctx* c = EVP_CIPHER_CTX_cipher_data(ctx);
+ c->type = GRASSHOPPER_CIPHER_ECB;
+ return gost_grasshopper_cipher_init(ctx, key, iv, enc);
+}
+
+static GRASSHOPPER_INLINE int gost_grasshopper_cipher_init_cbc(EVP_CIPHER_CTX* ctx, const unsigned char* key,
+ const unsigned char* iv,
+ int enc) {
+ gost_grasshopper_cipher_ctx* c = EVP_CIPHER_CTX_cipher_data(ctx);
+ c->type = GRASSHOPPER_CIPHER_CBC;
+ return gost_grasshopper_cipher_init(ctx, key, iv, enc);
+}
+
+static GRASSHOPPER_INLINE int gost_grasshopper_cipher_init_ofb(EVP_CIPHER_CTX* ctx, const unsigned char* key,
+ const unsigned char* iv,
+ int enc) {
+ gost_grasshopper_cipher_ctx_ofb* c = EVP_CIPHER_CTX_cipher_data(ctx);
+
+ c->c.type = GRASSHOPPER_CIPHER_OFB;
+
+ grasshopper_zero128(&c->buffer1);
+
+ return gost_grasshopper_cipher_init(ctx, key, iv, enc);
+}
+
+static GRASSHOPPER_INLINE int gost_grasshopper_cipher_init_cfb(EVP_CIPHER_CTX* ctx, const unsigned char* key,
+ const unsigned char* iv,
+ int enc) {
+ gost_grasshopper_cipher_ctx* c = EVP_CIPHER_CTX_cipher_data(ctx);
+ c->type = GRASSHOPPER_CIPHER_CFB;
+ return gost_grasshopper_cipher_init(ctx, key, iv, enc);
+}
+
+static GRASSHOPPER_INLINE int gost_grasshopper_cipher_init_ctr(EVP_CIPHER_CTX* ctx, const unsigned char* key,
+ const unsigned char* iv,
+ int enc) {
+ gost_grasshopper_cipher_ctx_ctr* c = EVP_CIPHER_CTX_cipher_data(ctx);
+
+ c->c.type = GRASSHOPPER_CIPHER_CTR;
+
+ grasshopper_zero128(&c->iv_buffer);
+ grasshopper_zero128(&c->partial_buffer);
+
+ c->counter = 0;
+
+ return gost_grasshopper_cipher_init(ctx, key, iv, enc);
+}
+
+static GRASSHOPPER_INLINE int gost_grasshopper_cipher_do(EVP_CIPHER_CTX* ctx, unsigned char* out,
+ const unsigned char* in, size_t inl) {
+ gost_grasshopper_cipher_ctx* c = (gost_grasshopper_cipher_ctx*) EVP_CIPHER_CTX_cipher_data(ctx);
+ struct GRASSHOPPER_CIPHER_PARAMS* params = &gost_cipher_params[c->type];
+
+ return params->do_cipher(ctx, out, in, inl);
+}
+
+static int gost_grasshopper_cipher_do_ecb(EVP_CIPHER_CTX* ctx, unsigned char* out,
+ const unsigned char* in, size_t inl) {
+ gost_grasshopper_cipher_ctx* c = (gost_grasshopper_cipher_ctx*) EVP_CIPHER_CTX_cipher_data(ctx);
+ bool encrypting = (bool) EVP_CIPHER_CTX_encrypting(ctx);
+ const unsigned char* current_in = in;
+ unsigned char* current_out = out;
+ size_t blocks = inl / GRASSHOPPER_BLOCK_SIZE;
+ size_t i;
+
+ for (i = 0; i < blocks; i++, current_in += GRASSHOPPER_BLOCK_SIZE, current_out += GRASSHOPPER_BLOCK_SIZE) {
+ if (encrypting) {
+ grasshopper_encrypt_block(&c->encrypt_round_keys, (grasshopper_w128_t*) current_in,
+ (grasshopper_w128_t*) current_out,
+ &c->buffer);
+ } else {
+ grasshopper_decrypt_block(&c->decrypt_round_keys, (grasshopper_w128_t*) current_in,
+ (grasshopper_w128_t*) current_out,
+ &c->buffer);
+ }
+ }
+
+ return 1;
+}
+
+static int gost_grasshopper_cipher_do_cbc(EVP_CIPHER_CTX* ctx, unsigned char* out,
+ const unsigned char* in, size_t inl) {
+ gost_grasshopper_cipher_ctx* c = (gost_grasshopper_cipher_ctx*) EVP_CIPHER_CTX_cipher_data(ctx);
+ unsigned char* iv = EVP_CIPHER_CTX_iv_noconst(ctx);
+ bool encrypting = (bool) EVP_CIPHER_CTX_encrypting(ctx);
+ const unsigned char* current_in = in;
+ unsigned char* current_out = out;
+ grasshopper_w128_t* currentInputBlock;
+ grasshopper_w128_t* currentOutputBlock;
+ size_t blocks = inl / GRASSHOPPER_BLOCK_SIZE;
+ size_t i;
+ grasshopper_w128_t* currentBlock;
+
+ currentBlock = (grasshopper_w128_t*) iv;
+
+ for (i = 0; i < blocks; i++, current_in += GRASSHOPPER_BLOCK_SIZE, current_out += GRASSHOPPER_BLOCK_SIZE) {
+ currentInputBlock = (grasshopper_w128_t*) current_in;
+ currentOutputBlock = (grasshopper_w128_t*) current_out;
+ if (encrypting) {
+ grasshopper_append128(currentBlock, currentInputBlock);
+ grasshopper_encrypt_block(&c->encrypt_round_keys, currentBlock, currentOutputBlock, &c->buffer);
+ grasshopper_copy128(currentBlock, currentOutputBlock);
+ } else {
+ grasshopper_decrypt_block(&c->decrypt_round_keys, currentInputBlock, currentOutputBlock, &c->buffer);
+ grasshopper_append128(currentOutputBlock, currentBlock);
+ grasshopper_copy128(currentBlock, currentInputBlock);
+ }
+ }
+
+ return 1;
+}
+
+static int gost_grasshopper_cipher_do_ctr(EVP_CIPHER_CTX* ctx, unsigned char* out,
+ const unsigned char* in, size_t inl) {
+ gost_grasshopper_cipher_ctx_ctr* c = (gost_grasshopper_cipher_ctx_ctr*) EVP_CIPHER_CTX_cipher_data(ctx);
+ unsigned char* iv = EVP_CIPHER_CTX_iv_noconst(ctx);
+ const unsigned char* current_in = in;
+ unsigned char* current_out = out;
+ size_t blocks = inl / GRASSHOPPER_BLOCK_SIZE;
+ grasshopper_w128_t* currentInputBlock;
+ grasshopper_w128_t* currentOutputBlock;
+ size_t lasted;
+
+ memcpy(&c->iv_buffer, iv, 8);
+
+ // full parts
+ for (size_t i = 0; i < blocks; i++, current_in += GRASSHOPPER_BLOCK_SIZE, current_out += GRASSHOPPER_BLOCK_SIZE) {
+ currentInputBlock = (grasshopper_w128_t*) current_in;
+ currentOutputBlock = (grasshopper_w128_t*) current_out;
+ memcpy(c->iv_buffer.b + 8, &c->counter, 8);
+ grasshopper_encrypt_block(&c->c.encrypt_round_keys, &c->iv_buffer, currentOutputBlock, &c->c.buffer);
+ grasshopper_append128(currentOutputBlock, currentInputBlock);
+ c->counter += 1;
+ }
+
+ // last part
+ lasted = inl - blocks * GRASSHOPPER_BLOCK_SIZE;
+ if (lasted > 0) {
+ currentInputBlock = (grasshopper_w128_t*) current_in;
+ currentOutputBlock = (grasshopper_w128_t*) current_out;
+ memcpy(c->iv_buffer.b + 8, &c->counter, 8);
+ grasshopper_encrypt_block(&c->c.encrypt_round_keys, &c->iv_buffer, &c->partial_buffer, &c->c.buffer);
+ for (size_t i = 0; i < lasted; i++) {
+ currentOutputBlock->b[i] = c->partial_buffer.b[i] ^ currentInputBlock->b[i];
+ }
+ c->counter += 1;
+ }
+
+ return 1;
+}
+
+static void gost_grasshopper_cnt_next(gost_grasshopper_cipher_ctx_ofb* ctx, grasshopper_w128_t* iv,
+ grasshopper_w128_t* buf) {
+ memcpy(&ctx->buffer1, iv, 16);
+ ctx->g = ctx->buffer1.b[0] | (ctx->buffer1.b[1] << 8) | (ctx->buffer1.b[2] << 16) |
+ ((uint32_t) ctx->buffer1.b[3] << 24);
+ ctx->g += 0x01010101;
+ ctx->buffer1.b[0] = (unsigned char) (ctx->g & 0xff);
+ ctx->buffer1.b[1] = (unsigned char) ((ctx->g >> 8) & 0xff);
+ ctx->buffer1.b[2] = (unsigned char) ((ctx->g >> 16) & 0xff);
+ ctx->buffer1.b[3] = (unsigned char) ((ctx->g >> 24) & 0xff);
+ ctx->g = ctx->buffer1.b[4] | (ctx->buffer1.b[5] << 8) | (ctx->buffer1.b[6] << 16) |
+ ((uint32_t) ctx->buffer1.b[7] << 24);
+ ctx->go = ctx->g;
+ ctx->g += 0x01010104;
+ if (ctx->go > ctx->g) { /* overflow */
+ ctx->g++;
+ }
+ ctx->buffer1.b[4] = (unsigned char) (ctx->g & 0xff);
+ ctx->buffer1.b[5] = (unsigned char) ((ctx->g >> 8) & 0xff);
+ ctx->buffer1.b[6] = (unsigned char) ((ctx->g >> 16) & 0xff);
+ ctx->buffer1.b[7] = (unsigned char) ((ctx->g >> 24) & 0xff);
+ ctx->g = ctx->buffer1.b[8] | (ctx->buffer1.b[9] << 8) | (ctx->buffer1.b[10] << 16) |
+ ((uint32_t) ctx->buffer1.b[11] << 24);
+ ctx->go = ctx->g;
+ ctx->g += 0x01010107;
+ if (ctx->go > ctx->g) { /* overflow */
+ ctx->g++;
+ }
+ ctx->buffer1.b[8] = (unsigned char) (ctx->g & 0xff);
+ ctx->buffer1.b[9] = (unsigned char) ((ctx->g >> 8) & 0xff);
+ ctx->buffer1.b[10] = (unsigned char) ((ctx->g >> 16) & 0xff);
+ ctx->buffer1.b[11] = (unsigned char) ((ctx->g >> 24) & 0xff);
+ ctx->g = ctx->buffer1.b[12] | (ctx->buffer1.b[13] << 8) | (ctx->buffer1.b[14] << 16) |
+ ((uint32_t) ctx->buffer1.b[15] << 24);
+ ctx->go = ctx->g;
+ ctx->g += 0x01010110;
+ if (ctx->go > ctx->g) { /* overflow */
+ ctx->g++;
+ }
+ ctx->buffer1.b[12] = (unsigned char) (ctx->g & 0xff);
+ ctx->buffer1.b[13] = (unsigned char) ((ctx->g >> 8) & 0xff);
+ ctx->buffer1.b[14] = (unsigned char) ((ctx->g >> 16) & 0xff);
+ ctx->buffer1.b[15] = (unsigned char) ((ctx->g >> 24) & 0xff);
+ memcpy(iv, &ctx->buffer1, 16);
+ grasshopper_encrypt_block(&ctx->c.encrypt_round_keys, &ctx->buffer1, buf, &ctx->c.buffer);
+}
+
+static int gost_grasshopper_cipher_do_ofb(EVP_CIPHER_CTX* ctx, unsigned char* out,
+ const unsigned char* in, size_t inl) {
+ gost_grasshopper_cipher_ctx_ofb* c = (gost_grasshopper_cipher_ctx_ofb*) EVP_CIPHER_CTX_cipher_data(ctx);
+ const unsigned char* in_ptr = in;
+ unsigned char* out_ptr = out;
+ unsigned char* buf = EVP_CIPHER_CTX_buf_noconst(ctx);
+ unsigned char* iv = EVP_CIPHER_CTX_iv_noconst(ctx);
+ int num = EVP_CIPHER_CTX_num(ctx);
+ size_t i = 0;
+ size_t j;
+
+ /* process partial block if any */
+ if (num > 0) {
+ for (j = (size_t) num, i = 0; j < GRASSHOPPER_BLOCK_SIZE && i < inl;
+ j++, i++, in_ptr++, out_ptr++) {
+ *out_ptr = buf[j] ^ (*in_ptr);
+ }
+ if (j == GRASSHOPPER_BLOCK_SIZE) {
+ EVP_CIPHER_CTX_set_num(ctx, 0);
+ } else {
+ EVP_CIPHER_CTX_set_num(ctx, (int) j);
+ return 1;
+ }
+ }
+
+ for (; i + GRASSHOPPER_BLOCK_SIZE <
+ inl; i += GRASSHOPPER_BLOCK_SIZE, in_ptr += GRASSHOPPER_BLOCK_SIZE, out_ptr += GRASSHOPPER_BLOCK_SIZE) {
+ /*
+ * block cipher current iv
+ */
+ /* Encrypt */
+ gost_grasshopper_cnt_next(c, (grasshopper_w128_t*) iv, (grasshopper_w128_t*) buf);
+
+ /*
+ * xor next block of input text with it and output it
+ */
+ /*
+ * output this block
+ */
+ for (j = 0; j < GRASSHOPPER_BLOCK_SIZE; j++) {
+ out_ptr[j] = buf[j] ^ in_ptr[j];
+ }
+ }
+
+ /* Process rest of buffer */
+ if (i < inl) {
+ gost_grasshopper_cnt_next(c, (grasshopper_w128_t*) iv, (grasshopper_w128_t*) buf);
+ for (j = 0; i < inl; j++, i++) {
+ out_ptr[j] = buf[j] ^ in_ptr[j];
+ }
+ EVP_CIPHER_CTX_set_num(ctx, (int) j);
+ } else {
+ EVP_CIPHER_CTX_set_num(ctx, 0);
+ }
+
+ return 1;
+}
+
+static int gost_grasshopper_cipher_do_cfb(EVP_CIPHER_CTX* ctx, unsigned char* out,
+ const unsigned char* in, size_t inl) {
+ gost_grasshopper_cipher_ctx* c = (gost_grasshopper_cipher_ctx*) EVP_CIPHER_CTX_cipher_data(ctx);
+ const unsigned char* in_ptr = in;
+ unsigned char* out_ptr = out;
+ unsigned char* buf = EVP_CIPHER_CTX_buf_noconst(ctx);
+ unsigned char* iv = EVP_CIPHER_CTX_iv_noconst(ctx);
+ bool encrypting = (bool) EVP_CIPHER_CTX_encrypting(ctx);
+ int num = EVP_CIPHER_CTX_num(ctx);
+ size_t i = 0;
+ size_t j = 0;
+
+ /* process partial block if any */
+ if (num > 0) {
+ for (j = (size_t) num, i = 0; j < GRASSHOPPER_BLOCK_SIZE && i < inl; j++, i++, in_ptr++, out_ptr++) {
+ if (!encrypting) {
+ buf[j + GRASSHOPPER_BLOCK_SIZE] = *in_ptr;
+ }
+ *out_ptr = buf[j] ^ (*in_ptr);
+ if (encrypting) {
+ buf[j + GRASSHOPPER_BLOCK_SIZE] = *out_ptr;
+ }
+ }
+ if (j == GRASSHOPPER_BLOCK_SIZE) {
+ memcpy(iv, buf + GRASSHOPPER_BLOCK_SIZE, GRASSHOPPER_BLOCK_SIZE);
+ EVP_CIPHER_CTX_set_num(ctx, 0);
+ } else {
+ EVP_CIPHER_CTX_set_num(ctx, (int) j);
+ return 1;
+ }
+ }
+
+ for (; i + GRASSHOPPER_BLOCK_SIZE <
+ inl; i += GRASSHOPPER_BLOCK_SIZE, in_ptr += GRASSHOPPER_BLOCK_SIZE, out_ptr += GRASSHOPPER_BLOCK_SIZE) {
+ /*
+ * block cipher current iv
+ */
+ grasshopper_encrypt_block(&c->encrypt_round_keys, (grasshopper_w128_t*) iv, (grasshopper_w128_t*) buf,
+ &c->buffer);
+ /*
+ * xor next block of input text with it and output it
+ */
+ /*
+ * output this block
+ */
+ if (!encrypting) {
+ memcpy(iv, in_ptr, GRASSHOPPER_BLOCK_SIZE);
+ }
+ for (j = 0; j < GRASSHOPPER_BLOCK_SIZE; j++) {
+ out_ptr[j] = buf[j] ^ in_ptr[j];
+ }
+ /* Encrypt */
+ /* Next iv is next block of cipher text */
+ if (encrypting) {
+ memcpy(iv, out_ptr, GRASSHOPPER_BLOCK_SIZE);
+ }
+ }
+
+ /* Process rest of buffer */
+ if (i < inl) {
+ grasshopper_encrypt_block(&c->encrypt_round_keys, (grasshopper_w128_t*) iv, (grasshopper_w128_t*) buf,
+ &c->buffer);
+ if (!encrypting) {
+ memcpy(buf + GRASSHOPPER_BLOCK_SIZE, in_ptr, inl - i);
+ }
+ for (j = 0; i < inl; j++, i++) {
+ out_ptr[j] = buf[j] ^ in_ptr[j];
+ }
+ EVP_CIPHER_CTX_set_num(ctx, (int) j);
+ if (encrypting) {
+ memcpy(buf + GRASSHOPPER_BLOCK_SIZE, out_ptr, j);
+ }
+ } else {
+ EVP_CIPHER_CTX_set_num(ctx, 0);
+ }
+
+ return 1;
+}
+
+static int gost_grasshopper_cipher_cleanup(EVP_CIPHER_CTX* ctx) {
+ gost_grasshopper_cipher_ctx* c = (gost_grasshopper_cipher_ctx*) EVP_CIPHER_CTX_cipher_data(ctx);
+ struct GRASSHOPPER_CIPHER_PARAMS* params = &gost_cipher_params[c->type];
+
+ gost_grasshopper_cipher_destroy(c);
+ if (params->destroy_cipher != NULL) {
+ params->destroy_cipher(c);
+ }
+
+ EVP_CIPHER_CTX_set_app_data(ctx, NULL);
+
+ return 1;
+}
+
+static int gost_grasshopper_set_asn1_parameters(EVP_CIPHER_CTX* ctx, ASN1_TYPE* params) {
+ int len = 0;
+ unsigned char* buf = NULL;
+ unsigned char* p = NULL;
+ ASN1_OCTET_STRING* os = NULL;
+
+ os = ASN1_OCTET_STRING_new();
+
+ if (!os || !ASN1_OCTET_STRING_set(os, buf, len)) {
+ OPENSSL_free(buf);
+ GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ OPENSSL_free(buf);
+
+ ASN1_TYPE_set(params, V_ASN1_SEQUENCE, os);
+ return 1;
+}
+
+static GRASSHOPPER_INLINE int gost_grasshopper_get_asn1_parameters(EVP_CIPHER_CTX* ctx, ASN1_TYPE* params) {
+ int ret = -1;
+
+ if (ASN1_TYPE_get(params) != V_ASN1_SEQUENCE) {
+ return ret;
+ }
+
+ return 1;
+}
+
+static int gost_grasshopper_cipher_ctl(EVP_CIPHER_CTX* ctx, int type, int arg, void* ptr) {
+ switch (type) {
+ case EVP_CTRL_RAND_KEY: {
+ if (RAND_bytes((unsigned char*) ptr, EVP_CIPHER_CTX_key_length(ctx)) <= 0) {
+ GOSTerr(GOST_F_GOST_CIPHER_CTL, GOST_R_RNG_ERROR);
+ return -1;
+ }
+ break;
+ }
+ default:
+ GOSTerr(GOST_F_GOST_CIPHER_CTL, GOST_R_UNSUPPORTED_CIPHER_CTL_COMMAND);
+ return -1;
+ }
+ return 1;
+}
+
+static GRASSHOPPER_INLINE EVP_CIPHER* cipher_gost_grasshopper_create(int cipher_type, int block_size) {
+ return EVP_CIPHER_meth_new(cipher_type,
+ block_size /* block_size */,
+ GRASSHOPPER_KEY_SIZE /* key_size */);
+}
+
+const int cipher_gost_grasshopper_setup(EVP_CIPHER* cipher, uint8_t mode, int iv_size, bool padding) {
+ return EVP_CIPHER_meth_set_iv_length(cipher, iv_size) &&
+ EVP_CIPHER_meth_set_flags(cipher, (unsigned long) (
+ mode |
+ ((!padding) ? EVP_CIPH_NO_PADDING : 0) |
+ ((iv_size > 0) ? EVP_CIPH_CUSTOM_IV : 0) |
+ EVP_CIPH_RAND_KEY |
+ EVP_CIPH_ALWAYS_CALL_INIT)
+ ) &&
+ EVP_CIPHER_meth_set_cleanup(cipher, gost_grasshopper_cipher_cleanup) &&
+ EVP_CIPHER_meth_set_set_asn1_params(cipher, gost_grasshopper_set_asn1_parameters) &&
+ EVP_CIPHER_meth_set_get_asn1_params(cipher, gost_grasshopper_get_asn1_parameters) &&
+ EVP_CIPHER_meth_set_ctrl(cipher, gost_grasshopper_cipher_ctl) &&
+ EVP_CIPHER_meth_set_do_cipher(cipher, gost_grasshopper_cipher_do);
+}
+
+static const GRASSHOPPER_INLINE EVP_CIPHER* cipher_gost_grasshopper(uint8_t mode, uint8_t num) {
+ EVP_CIPHER** cipher;
+ struct GRASSHOPPER_CIPHER_PARAMS* params;
+
+ cipher = &gost_grasshopper_ciphers[num];
+
+ if (*cipher == NULL) {
+ params = &gost_cipher_params[num];
+
+ int nid = params->nid;
+ grasshopper_init_cipher_func init_cipher = params->init_cipher;
+ int block_size = params->block_size;
+ int ctx_size = params->ctx_size;
+ int iv_size = params->iv_size;
+ bool padding = params->padding;
+
+ *cipher = cipher_gost_grasshopper_create(nid, block_size);
+ if (*cipher == NULL) {
+ return NULL;
+ }
+
+ if (!cipher_gost_grasshopper_setup(*cipher, mode, iv_size, padding) ||
+ !EVP_CIPHER_meth_set_init(*cipher, init_cipher) ||
+ !EVP_CIPHER_meth_set_impl_ctx_size(*cipher, ctx_size)) {
+ EVP_CIPHER_meth_free(*cipher);
+ *cipher = NULL;
+ }
+ }
+
+ return *cipher;
+}
+
+const GRASSHOPPER_INLINE EVP_CIPHER* cipher_gost_grasshopper_ecb() {
+ return cipher_gost_grasshopper(EVP_CIPH_ECB_MODE, GRASSHOPPER_CIPHER_ECB);
+}
+
+const GRASSHOPPER_INLINE EVP_CIPHER* cipher_gost_grasshopper_cbc() {
+ return cipher_gost_grasshopper(EVP_CIPH_CBC_MODE, GRASSHOPPER_CIPHER_CBC);
+}
+
+const GRASSHOPPER_INLINE EVP_CIPHER* cipher_gost_grasshopper_ofb() {
+ return cipher_gost_grasshopper(EVP_CIPH_OFB_MODE, GRASSHOPPER_CIPHER_OFB);
+}
+
+const GRASSHOPPER_INLINE EVP_CIPHER* cipher_gost_grasshopper_cfb() {
+ return cipher_gost_grasshopper(EVP_CIPH_CFB_MODE, GRASSHOPPER_CIPHER_CFB);
+}
+
+const GRASSHOPPER_INLINE EVP_CIPHER* cipher_gost_grasshopper_ctr() {
+ return cipher_gost_grasshopper(EVP_CIPH_CTR_MODE, GRASSHOPPER_CIPHER_CTR);
+}
+
+#if defined(__cplusplus)
+}
+#endif
projects / openssl-gost / engine.git / blobdiff