X-Git-Url: http://wagner.pp.ru/gitweb/?a=blobdiff_plain;f=gost_grasshopper_cipher.c;h=d9acd1eb2a28f9726b4b3ff6e5776a03bfbb163d;hb=6e163b2cdd1233b2b0f46ddd2c9e0fdab0d318f8;hp=b33fe53dca4ba3f7a2fdf24e3ebf5f84f80965b7;hpb=868ae7a730a86f9c1021ea766cd714f817cb934d;p=openssl-gost%2Fengine.git

diff --git a/gost_grasshopper_cipher.c b/gost_grasshopper_cipher.c
index b33fe53..d9acd1e 100644
--- a/gost_grasshopper_cipher.c
+++ b/gost_grasshopper_cipher.c
@@ -17,6 +17,7 @@ extern "C" {
 #include <openssl/err.h>
 #include <string.h>
 
+#include "gost_lcl.h"
 #include "e_gost_err.h"
 
 enum GRASSHOPPER_CIPHER_TYPE {
@@ -138,8 +139,6 @@ static GRASSHOPPER_INLINE void gost_grasshopper_cipher_destroy_ctr(gost_grasshop
 
     grasshopper_zero128(&ctx->iv_buffer);
     grasshopper_zero128(&ctx->partial_buffer);
-
-    ctx->counter = 0;
 }
 
 int gost_grasshopper_cipher_init(EVP_CIPHER_CTX* ctx, const unsigned char* key,
@@ -210,12 +209,11 @@ GRASSHOPPER_INLINE int gost_grasshopper_cipher_init_ctr(EVP_CIPHER_CTX* ctx, con
     gost_grasshopper_cipher_ctx_ctr* c = EVP_CIPHER_CTX_get_cipher_data(ctx);
 
     c->c.type = GRASSHOPPER_CIPHER_CTR;
+    ctx->num = 0;
 
     grasshopper_zero128(&c->iv_buffer);
     grasshopper_zero128(&c->partial_buffer);
 
-    c->counter = 0;
-
     return gost_grasshopper_cipher_init(ctx, key, iv, enc);
 }
 
@@ -283,28 +281,55 @@ int gost_grasshopper_cipher_do_cbc(EVP_CIPHER_CTX* ctx, unsigned char* out,
     return 1;
 }
 
+void inc_counter(unsigned char* counter, size_t counter_bytes)
+{
+    unsigned char c;
+    unsigned int n = counter_bytes;
+
+    do {
+        --n;
+        c = counter[n];
+        ++c;
+        counter[n] = c;
+        if (c) return;
+    } while (n);
+}
+
+/* increment counter (128-bit int) by 1 */
+static void ctr128_inc(unsigned char *counter)
+{
+	inc_counter(counter, 16);
+}
+
 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_get_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;
+    unsigned int n = ctx->num;
     size_t lasted;
     size_t i;
 
+    while (n && inl) {
+	*(current_out++) = *(current_in++) ^ c->partial_buffer.b[n];
+	--inl;
+	n = (n + 1) % GRASSHOPPER_BLOCK_SIZE;
+    }
+    ctx->num = n;
+    size_t blocks = inl / GRASSHOPPER_BLOCK_SIZE;
+
     memcpy(&c->iv_buffer, iv, 8);
 
     // full parts
     for (i = 0; i < blocks; i++) {
         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;
+        ctr128_inc(c->iv_buffer.b);
         current_in += GRASSHOPPER_BLOCK_SIZE;
         current_out += GRASSHOPPER_BLOCK_SIZE;
     }
@@ -314,12 +339,12 @@ int gost_grasshopper_cipher_do_ctr(EVP_CIPHER_CTX* ctx, unsigned char* out,
     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 (i = 0; i < lasted; i++) {
             currentOutputBlock->b[i] = c->partial_buffer.b[i] ^ currentInputBlock->b[i];
         }
-        c->counter += 1;
+	ctx->num = i;
+        ctr128_inc(c->iv_buffer.b);
     }
 
     return 1;
@@ -526,14 +551,13 @@ int gost_grasshopper_cipher_cleanup(EVP_CIPHER_CTX* ctx) {
 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);
+        GOSTerr(GOST_F_GOST_GRASSHOPPER_SET_ASN1_PARAMETERS, ERR_R_MALLOC_FAILURE);
         return 0;
     }
     OPENSSL_free(buf);
@@ -556,13 +580,13 @@ int gost_grasshopper_cipher_ctl(EVP_CIPHER_CTX* ctx, int type, int arg, void* pt
     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);
+                GOSTerr(GOST_F_GOST_GRASSHOPPER_CIPHER_CTL, GOST_R_RNG_ERROR);
                 return -1;
             }
             break;
         }
         default:
-            GOSTerr(GOST_F_GOST_CIPHER_CTL, GOST_R_UNSUPPORTED_CIPHER_CTL_COMMAND);
+            GOSTerr(GOST_F_GOST_GRASSHOPPER_CIPHER_CTL, GOST_R_UNSUPPORTED_CIPHER_CTL_COMMAND);
             return -1;
     }
     return 1;
@@ -642,6 +666,20 @@ const GRASSHOPPER_INLINE EVP_CIPHER* cipher_gost_grasshopper_ctr() {
     return cipher_gost_grasshopper(EVP_CIPH_CTR_MODE, GRASSHOPPER_CIPHER_CTR);
 }
 
+void cipher_gost_grasshopper_destroy(void)
+{
+    EVP_CIPHER_meth_free(gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_ECB]);
+    gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_ECB] = NULL;
+    EVP_CIPHER_meth_free(gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_CBC]);
+    gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_CBC] = NULL;
+    EVP_CIPHER_meth_free(gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_OFB]);
+    gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_OFB] = NULL;
+    EVP_CIPHER_meth_free(gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_CFB]);
+    gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_CFB] = NULL;
+    EVP_CIPHER_meth_free(gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_CTR]);
+    gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_CTR] = NULL;
+}
+
 #if defined(__cplusplus)
 }
 #endif