test_grasshopper: ctr test 2 and ofb with truncated iv tests

Full test of OFB to match GOST R 34.13-2015 test vectors is impossible,
due to test IVs are having size (256-bits) over the maximum openssl can
allow (128-bits).

I generated new test vectors from canonical implementation
from `PR_GOSTR_bch_v9.zip` (revision of 2016-10-28) by truncating test
IVs in half.

diff --git a/test_grasshopper.c b/test_grasshopper.c
index 3385be5c733d3eb58c5201280f8fad67ce33c713..cb2789562064b64fc2827f22d507fadcb3ce330e 100644 (file)
--- a/test_grasshopper.c
+++ b/test_grasshopper.c
@@ -32,7 +32,9 @@
 
 enum e_mode {
     E_ECB = 0,
-    E_CTR
+    E_CTR,
+    E_CTR_IV2,
+    E_OFB,
 };
 
 /* Test key from both GOST R 34.12-2015 and GOST R 34.13-2015. */
@@ -63,9 +65,25 @@ static const unsigned char E[4][sizeof(P)] = {
        0xa5,0xea,0xe8,0x8b,0xe6,0x35,0x6e,0xd3,0xd5,0xe8,0x77,0xf1,0x35,0x64,0xa3,0xa5,
        0xcb,0x91,0xfa,0xb1,0xf2,0x0c,0xba,0xb6,0xd1,0xc6,0xd1,0x58,0x20,0xbd,0xba,0x73,
     },
+    { /* CTR test vectors again for IV2 test */
+       0xf1,0x95,0xd8,0xbe,0xc1,0x0e,0xd1,0xdb,0xd5,0x7b,0x5f,0xa2,0x40,0xbd,0xa1,0xb8,
+       0x85,0xee,0xe7,0x33,0xf6,0xa1,0x3e,0x5d,0xf3,0x3c,0xe4,0xb3,0x3c,0x45,0xde,0xe4,
+       0xa5,0xea,0xe8,0x8b,0xe6,0x35,0x6e,0xd3,0xd5,0xe8,0x77,0xf1,0x35,0x64,0xa3,0xa5,
+       0xcb,0x91,0xfa,0xb1,0xf2,0x0c,0xba,0xb6,0xd1,0xc6,0xd1,0x58,0x20,0xbd,0xba,0x73,
+    },
+    { /* OFB test vector generated from canonical implementation */
+       0x81,0x80,0x0a,0x59,0xb1,0x84,0x2b,0x24,0xff,0x1f,0x79,0x5e,0x89,0x7a,0xbd,0x95,
+       0x77,0x91,0x46,0xdb,0x2d,0x93,0xa9,0x4e,0xd9,0x3c,0xf6,0x8b,0x32,0x39,0x7f,0x19,
+       0xe9,0x3c,0x9e,0x57,0x44,0x1d,0x87,0x05,0x45,0xf2,0x40,0x36,0xa5,0x8c,0xee,0xa3,
+       0xcf,0x3f,0x00,0x61,0xd5,0x64,0x23,0x54,0x5b,0x96,0x0d,0x86,0x4c,0xc8,0x68,0xda,
+    }
 };
-static const unsigned char iv_ctr[] = { 0x12,0x34,0x56,0x78,0x90,0xab,0xce,0xf0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
-static const unsigned char *iv[4] = { NULL, iv_ctr, };
+static const unsigned char iv_ctr[]    = { 0x12,0x34,0x56,0x78,0x90,0xab,0xce,0xf0 };
+/* right [8] part of IV should be ignored by ctr */
+static const unsigned char iv_ctr_iv2[]        = { 0x12,0x34,0x56,0x78,0x90,0xab,0xce,0xf0,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff };
+/* truncated to 128-bits IV */
+static const unsigned char iv_ofb_t[]  = { 0x12,0x34,0x56,0x78,0x90,0xab,0xce,0xf0,0xa1,0xb2,0xc3,0xd4,0xe5,0xf0,0x01,0x12 };
+static const unsigned char *iv[4] = { NULL, iv_ctr, iv_ctr_iv2, iv_ofb_t };
 
 static void hexdump(const void *ptr, size_t len)
 {
@@ -203,7 +221,9 @@ int main(int argc, char **argv)
 
     ret |= test_block(cipher_gost_grasshopper_ecb(), "ecb", E_ECB);
     ret |= test_block(cipher_gost_grasshopper_ctr(), "ctr", E_CTR);
+    ret |= test_block(cipher_gost_grasshopper_ctr(), "ctr iv2", E_CTR_IV2);
     ret |= test_stream(cipher_gost_grasshopper_ctr(), "ctr", E_CTR);
+    ret |= test_block(cipher_gost_grasshopper_ofb(), "ofb", E_OFB);
     /*
      * Other modes (ofb, cbc, cfb) is impossible to test to match GOST R
      * 34.13-2015 test vectors due to these vectors having exceeding IV