Bugfix + some basic test setup

1 files changed, 94 insertions, 27 deletions

diff --git a/gost_keyexpimp.c b/gost_keyexpimp.c
index ba19245..b351ee2 100644
--- a/gost_keyexpimp.c
+++ b/gost_keyexpimp.c
@@ -8,10 +8,10 @@
  * Function expects that out is a preallocated buffer of length
  * defined as sum of shared_len and mac length defined by mac_nid
  * */
-int gost_kexp15(const unsigned char *shared_key, const int shared_len, 
+int gost_kexp15(const unsigned char *shared_key, const int shared_len,
     int cipher_nid, const unsigned char *cipher_key, const size_t cipher_key_len,
     int mac_nid, unsigned char *mac_key, const size_t mac_key_len,
-    const char *iv, const size_t ivlen, 
+    const char *iv, const size_t ivlen,
     unsigned char *out, int *out_len
 )
 {
@@ -22,59 +22,126 @@ int gost_kexp15(const unsigned char *shared_key, const int shared_len,
   EVP_CIPHER_CTX *ciph = NULL;
   EVP_MD_CTX *mac = NULL;
 
-	int ret = 0;
+  int ret = 0;
+  int len;
 
-	/* we expect IV of half length */
+  /* we expect IV of half length */
   memset(iv_full, 0, 16);
   memcpy(iv_full, iv, ivlen);
 
   mac = EVP_MD_CTX_new();
-	if (mac == NULL) {
-		GOSTerr(GOST_F_GOST_KEXP15, ERR_R_MALLOC_FAILURE);
-		goto err;
-	}
+  if (mac == NULL) {
+    GOSTerr(GOST_F_GOST_KEXP15, ERR_R_MALLOC_FAILURE);
+    goto err;
+  }
 
-  if(EVP_DigestInit_ex(mac, EVP_get_digestbynid(mac_nid), NULL) <= 0 
-	|| EVP_MD_CTX_ctrl(mac, EVP_MD_CTRL_SET_KEY, mac_key_len, mac_key) <= 0
+  if(EVP_DigestInit_ex(mac, EVP_get_digestbynid(mac_nid), NULL) <= 0
+  || EVP_MD_CTX_ctrl(mac, EVP_MD_CTRL_SET_KEY, mac_key_len, mac_key) <= 0
   || EVP_DigestUpdate(mac, shared_key, shared_len) <= 0
   || EVP_DigestFinal_ex(mac, mac_buf, &mac_len) <= 0) {
-		GOSTerr(GOST_F_GOST_KEXP15, ERR_R_INTERNAL_ERROR);
-		goto err;
-	}
+    GOSTerr(GOST_F_GOST_KEXP15, ERR_R_INTERNAL_ERROR);
+    goto err;
+  }
 
   ciph = EVP_CIPHER_CTX_new();
-	if (ciph == NULL) {
-		GOSTerr(GOST_F_GOST_KEXP15, ERR_R_MALLOC_FAILURE);
-		goto err;
-	}
+  if (ciph == NULL) {
+    GOSTerr(GOST_F_GOST_KEXP15, ERR_R_MALLOC_FAILURE);
+    goto err;
+  }
 
   if (EVP_CipherInit_ex(ciph, EVP_get_cipherbynid(cipher_nid), NULL, NULL, NULL, 1) <= 0
   || EVP_CipherInit_ex(ciph, NULL, NULL, cipher_key, iv_full, 1) <= 0
-  || EVP_CipherUpdate(ciph, out, out_len, shared_key, shared_len) <= 0
-  || EVP_CipherFinal_ex(ciph, out, out_len) <= 0) {
-		GOSTerr(GOST_F_GOST_KEXP15, ERR_R_INTERNAL_ERROR);
-		goto err;
-	}
+  || EVP_CipherUpdate(ciph, out, &len, shared_key, shared_len) <= 0
+  || EVP_CipherUpdate(ciph, out + shared_len, &len, mac_buf, mac_len) <= 0
+  || EVP_CipherFinal_ex(ciph, out + shared_len + len, out_len) <= 0) {
+    GOSTerr(GOST_F_GOST_KEXP15, ERR_R_INTERNAL_ERROR);
+    goto err;
+  }
 
-	memcpy(out + *out_len, mac_buf, mac_len);
-	*out_len += mac_len;
+  *out_len = shared_len + mac_len;
 
-	ret = 1;
+  ret = 1;
 
  err:
+  /* TODO clear mac_buf */
   EVP_MD_CTX_free(mac);
   EVP_CIPHER_CTX_free(ciph);
 
   return ret;
 }
 
-int gost_kimp15(const char *expkey, const size_t expkeylen, 
+int gost_kimp15(const char *expkey, const size_t expkeylen,
     int cipher_nid, const char *cipher_key, const size_t cipher_key_len,
     int mac_nid, const char *mac_key, const size_t mac_key_len,
-    const char *iv, const size_t ivlen, 
+    const char *iv, const size_t ivlen,
     char *shared_key, size_t *shared_len
 )
 {
   return 0;
 }
 
+/*
+ * keyout expected to be 64 bytes
+ * */
+int gost_keg(const unsigned char *seckey, const size_t seckey_len,
+    const EC_POINT *pub, const unsigned char *h,
+    unsigned char *keyout)
+{
+    return 0;
+}
+
+#ifdef ENABLE_UNIT_TESTS
+# include <stdio.h>
+# include <string.h>
+# include <openssl/obj_mac.h>
+
+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 main(void)
+{
+    const unsigned char key[] = {
+        0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF,
+        0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
+        0xFE, 0xDC, 0xBA, 0x98, 0x76, 0x54, 0x32, 0x10,
+        0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF
+    };
+
+    const unsigned char magma_key[] = {
+0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
+0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F,
+0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,
+0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
+    };
+
+    const unsigned char magma_key[] = {
+0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
+0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F,
+    };
+
+
+    unsigned char buf[32+8];
+    int ret;
+    int outlen = 40;
+
+    ret = gost_kexp15(key, 32,
+    NID_magma_ctr, magma_key, 32,
+    NID_magma_mac, mac_key, 32,
+    iv, 4,
+    buf, &outlen);
+
+}
+
+#endif