test_grasshopper: Stream modes testing

[openssl-gost/engine.git] / gost_grasshopper_cipher.c

diff --git a/gost_grasshopper_cipher.c b/gost_grasshopper_cipher.c
index 2cce25176a1e43bf09f273472c9c9444272c612c..d9acd1eb2a28f9726b4b3ff6e5776a03bfbb163d 100644 (file)
--- 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 {
@@ -208,6 +209,7 @@ 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);
@@ -279,11 +281,10 @@ int gost_grasshopper_cipher_do_cbc(EVP_CIPHER_CTX* ctx, unsigned char* out,
     return 1;
 }
 
-/* increment counter (128-bit int) by 1 */
-static void ctr128_inc(unsigned char *counter)
+void inc_counter(unsigned char* counter, size_t counter_bytes)
 {
-    unsigned int n = 16;
     unsigned char c;
+    unsigned int n = counter_bytes;
 
     do {
         --n;
@@ -294,18 +295,32 @@ static void ctr128_inc(unsigned char *counter)
     } 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
@@ -328,6 +343,7 @@ int gost_grasshopper_cipher_do_ctr(EVP_CIPHER_CTX* ctx, unsigned char* out,
         for (i = 0; i < lasted; i++) {
             currentOutputBlock->b[i] = c->partial_buffer.b[i] ^ currentInputBlock->b[i];
         }
+       ctx->num = i;
         ctr128_inc(c->iv_buffer.b);
     }
 
@@ -541,7 +557,7 @@ int gost_grasshopper_set_asn1_parameters(EVP_CIPHER_CTX* ctx, ASN1_TYPE* params)
 
     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);
@@ -564,13 +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;