emile: reduce code duplication between gnutls and openssl backend.devs/cedric/emile

Add a visible emile_binbuf_sha1 implementation and deduplicate
emile_pbkdf2_sha1 (but does not explicitely expose it).

6 files changed, 101 insertions, 98 deletions

diff --git a/src/lib/emile/emile_cipher.c b/src/lib/emile/emile_cipher.c
index 3c5fd185cc..544f271400 100644
--- a/src/lib/emile/emile_cipher.c
+++ b/src/lib/emile/emile_cipher.c
@@ -13,6 +13,15 @@ Eina_Bool _emile_cipher_init(void)
    return EINA_FALSE;
 }
 
+EAPI Eina_Bool
+emile_binbuf_sha1(const char *key EINA_UNUSED,
+                  int key_len EINA_UNUSED,
+                  const Eina_Binbuf *data EINA_UNUSED,
+                  unsigned char digest[20])
+{
+   return EINA_FALSE;
+}
+
 EAPI Eina_Binbuf *
 emile_binbuf_cipher(const Eina_Binbuf *data EINA_UNUSED,
                     const char *key EINA_UNUSED,
diff --git a/src/lib/emile/emile_cipher.h b/src/lib/emile/emile_cipher.h
index 80097545ed..69379d8721 100644
--- a/src/lib/emile/emile_cipher.h
+++ b/src/lib/emile/emile_cipher.h
@@ -26,6 +26,12 @@ EAPI Eina_Binbuf *emile_binbuf_cipher(const Eina_Binbuf *in,
 EAPI Eina_Binbuf *emile_binbuf_decipher(const Eina_Binbuf *in,
                                         const char *key, unsigned int length);
 
+EAPI Eina_Bool emile_binbuf_sha1(const char *key,
+                                 unsigned int key_len,
+                                 const Eina_Binbuf *data,
+                                 unsigned char digest[20]);
+
+
 EAPI Emile_SSL *emile_cipher_server_listen(Emile_Cipher_Type t);
 EAPI Emile_SSL *emile_cipher_client_connect(Emile_SSL *server, int fd);
 EAPI Emile_SSL *emile_cipher_server_connect(Emile_Cipher_Type t);
diff --git a/src/lib/emile/emile_cipher_gnutls.c b/src/lib/emile/emile_cipher_gnutls.c
index 998ce886ca..d51ae8bb9a 100644
--- a/src/lib/emile/emile_cipher_gnutls.c
+++ b/src/lib/emile/emile_cipher_gnutls.c
@@ -170,56 +170,15 @@ emile_hmac_sha1(const void    *key,
    return EINA_TRUE;
 }
 
-static Eina_Bool
-emile_pbkdf2_sha1(const char          *key,
-                  int                  key_len,
-                  const unsigned char *salt,
-                  unsigned int         salt_len,
-                  int                  iter,
-                  unsigned char       *res,
-                  int                  res_len)
+EAPI Eina_Bool
+emile_binbuf_sha1(const char *key,
+                  unsigned int key_len,
+                  const Eina_Binbuf *data,
+                  unsigned char digest[20])
 {
-   unsigned char digest[20];
-   unsigned char tab[4];
-   unsigned char *p = res;
-   unsigned char *buf;
-   unsigned int i;
-   int digest_len = 20;
-   int len = res_len;
-   int tmp_len;
-   int j, k;
-
-   buf = alloca(salt_len + 4);
-   if (!buf) return EINA_FALSE;
-
-   for (i = 1; len; len -= tmp_len, p += tmp_len, i++)
-     {
-        if (len > digest_len)
-          tmp_len = digest_len;
-        else
-          tmp_len = len;
-
-        tab[0] = (unsigned char)(i & 0xff000000) >> 24;
-        tab[1] = (unsigned char)(i & 0x00ff0000) >> 16;
-        tab[2] = (unsigned char)(i & 0x0000ff00) >> 8;
-        tab[3] = (unsigned char)(i & 0x000000ff) >> 0;
-
-        memcpy(buf, salt, salt_len);
-        memcpy(buf + salt_len, tab, 4);
-        if (!emile_hmac_sha1(key, key_len, buf, salt_len + 4, digest))
-          return EINA_FALSE;
-        memcpy(p, digest, tmp_len);
-
-        for (j = 1; j < iter; j++)
-          {
-             if (!emile_hmac_sha1(key, key_len, digest, 20, digest))
-               return EINA_FALSE;
-             for (k = 0; k < tmp_len; k++)
-               p[k] ^= digest[k];
-          }
-     }
-
-   return EINA_TRUE;
+   return emile_hmac_sha1(key, key_len,
+                          eina_binbuf_string_get(data), eina_binbuf_length_get(data),
+                          digest);
 }
 
 EAPI Eina_Binbuf *
diff --git a/src/lib/emile/emile_cipher_openssl.c b/src/lib/emile/emile_cipher_openssl.c
index 18ce5c7510..46143d0b45 100644
--- a/src/lib/emile/emile_cipher_openssl.c
+++ b/src/lib/emile/emile_cipher_openssl.c
@@ -57,56 +57,16 @@ _emile_cipher_init(void)
    return EINA_TRUE;
 }
 
-static Eina_Bool
-emile_pbkdf2_sha1(const char          *key,
-                  int                  key_len,
-                  const unsigned char *salt,
-                  unsigned int         salt_len,
-                  int                  iter,
-                  unsigned char       *res,
-                  int                  res_len)
+EAPI Eina_Bool
+emile_binbuf_sha1(const char *key,
+                  unsigned int key_len,
+                  const Eina_Binbuf *data,
+                  unsigned char digest[20])
 {
-   unsigned char digest[20];
-   unsigned char tab[4];
-   unsigned char *p = res;
-   unsigned char *buf;
-   unsigned int i;
-   int digest_len = 20;
-   int len = res_len;
-   int tmp_len;
-   int j, k;
-   HMAC_CTX hctx;
-
-   buf = alloca(salt_len + 4);
-   if (!buf) return EINA_FALSE;
-
-   for (i = 1; len; len -= tmp_len, p += tmp_len, i++)
-     {
-        if (len > digest_len)
-          tmp_len = digest_len;
-        else
-          tmp_len = len;
-
-        tab[0] = (unsigned char)(i & 0xff000000) >> 24;
-        tab[1] = (unsigned char)(i & 0x00ff0000) >> 16;
-        tab[2] = (unsigned char)(i & 0x0000ff00) >> 8;
-        tab[3] = (unsigned char)(i & 0x000000ff) >> 0;
-
-        HMAC_Init(&hctx, key, key_len, EVP_sha1());
-        HMAC_Update(&hctx, salt, salt_len);
-        HMAC_Update(&hctx, tab, 4);
-        HMAC_Final(&hctx, digest, NULL);
-        memcpy(p, digest, tmp_len);
-
-        for (j = 1; j < iter; j++)
-          {
-             HMAC(EVP_sha1(), key, key_len, digest, 20, digest, NULL);
-             for (k = 0; k < tmp_len; k++)
-               p[k] ^= digest[k];
-          }
-        HMAC_cleanup(&hctx);
-     }
-
+   HMAC(EVP_sha1(),
+        key, key_len,
+        eina_binbuf_string_get(data), eina_binbuf_length_get(data),
+        digest, NULL);
    return EINA_TRUE;
 }
 
diff --git a/src/lib/emile/emile_main.c b/src/lib/emile/emile_main.c
index eb18a61de5..b8712fce45 100644
--- a/src/lib/emile/emile_main.c
+++ b/src/lib/emile/emile_main.c
@@ -104,3 +104,63 @@ emile_shutdown(void)
 
    return _emile_init_count;
 }
+
+/* For the moment, we have just one function shared accross both cipher
+ * backend, so here it is. */
+Eina_Bool
+emile_pbkdf2_sha1(const char *key,
+                  unsigned int key_len,
+                  const unsigned char *salt,
+                  unsigned int salt_len,
+                  unsigned int iter,
+                  unsigned char *res,
+                  unsigned int res_len)
+{
+   Eina_Binbuf *step1, *step2;
+   unsigned char *buf;
+   unsigned char *p = res;
+   unsigned char digest[20];
+   unsigned char tab[4];
+   unsigned int len = res_len;
+   unsigned int tmp_len;
+   unsigned int i, j, k;
+
+   buf = alloca(salt_len + 4);
+   if (!buf) return EINA_FALSE;
+
+   step1 = eina_binbuf_manage_read_only_new_length(buf, salt_len + 4);
+   if (!step1) return EINA_FALSE;
+   step2 = eina_binbuf_manage_read_only_new_length(digest, 20);
+   if (!step2) return EINA_FALSE;
+
+   for (i = 1; len; len -= tmp_len, p += tmp_len, i++)
+     {
+        tmp_len = (len > 20) ? 20 : len;
+
+        tab[0] = (unsigned char)(i & 0xff000000) >> 24;
+        tab[1] = (unsigned char)(i & 0x00ff0000) >> 16;
+        tab[2] = (unsigned char)(i & 0x0000ff00) >> 8;
+        tab[3] = (unsigned char)(i & 0x000000ff) >> 0;
+
+        memcpy(buf, salt, salt_len);
+        memcpy(buf + salt_len, tab, 4);
+
+        if (!emile_binbuf_sha1(key, key_len, step1, digest))
+          return EINA_FALSE;
+
+        memcpy(p, digest, tmp_len);
+
+        for (j = 1; j < iter; j++)
+          {
+             if (!emile_binbuf_sha1(key, key_len, step2, digest))
+               return EINA_FALSE;
+             for (k = 0; k < tmp_len; k++)
+               p[k] ^= digest[k];
+          }
+     }
+
+   eina_binbuf_free(step1);
+   eina_binbuf_free(step2);
+
+   return EINA_TRUE;
+}
diff --git a/src/lib/emile/emile_private.h b/src/lib/emile/emile_private.h
index f6a005d44a..cba9022394 100644
--- a/src/lib/emile/emile_private.h
+++ b/src/lib/emile/emile_private.h
@@ -34,4 +34,13 @@ typedef enum
 
 Eina_Bool _emile_cipher_init(void);
 
+Eina_Bool
+emile_pbkdf2_sha1(const char *key,
+                  unsigned int key_len,
+                  const unsigned char *salt,
+                  unsigned int salt_len,
+                  unsigned int iter,
+                  unsigned char *res,
+                  unsigned int res_len);
+
 #endif /* EMILE_PRIVATE_H_ */