1 files changed, 132 insertions, 0 deletions
diff --git a/libpurple/ciphers/gchecksum.c b/libpurple/ciphers/gchecksum.c
new file mode 100644
index 0000000000..299c803401
--- /dev/null
+++ b/libpurple/ciphers/gchecksum.c
@@ -0,0 +1,132 @@
+#include <cipher.h>
+
+#if GLIB_CHECK_VERSION(2,16,0)
+
+void
+purple_g_checksum_init(PurpleCipherContext *context, GChecksumType type)
+{
+    GChecksum *checksum;
+
+    checksum = g_checksum_new(type);
+    purple_cipher_context_set_data(context, checksum);
+}
+
+void
+purple_g_checksum_reset(PurpleCipherContext *context, GChecksumType type)
+{
+    GChecksum *checksum;
+
+    checksum = purple_cipher_context_get_data(context);
+    g_return_if_fail(checksum != NULL);
+
+#if GLIB_CHECK_VERSION(2,18,0)
+    g_checksum_reset(checksum);
+#else
+    g_checksum_free(checksum);
+    checksum = g_checksum_new(type);
+    purple_cipher_context_set_data(context, checksum);
+#endif
+}
+
+void
+purple_g_checksum_uninit(PurpleCipherContext *context)
+{
+    GChecksum *checksum;
+
+    checksum = purple_cipher_context_get_data(context);
+    g_return_if_fail(checksum != NULL);
+
+    g_checksum_free(checksum);
+}
+
+void
+purple_g_checksum_append(PurpleCipherContext *context, const guchar *data,
+                         gsize len)
+{
+    GChecksum *checksum;
+
+    checksum = purple_cipher_context_get_data(context);
+    g_return_if_fail(checksum != NULL);
+
+    while (len >= G_MAXSSIZE) {
+        g_checksum_update(checksum, data, G_MAXSSIZE);
+        len -= G_MAXSSIZE;
+        data += G_MAXSSIZE;
+    }
+
+    if (len)
+        g_checksum_update(checksum, data, len);
+}
+
+gboolean
+purple_g_checksum_digest(PurpleCipherContext *context, GChecksumType type,
+                         gsize len, guchar *digest, gsize *out_len)
+{
+    GChecksum *checksum;
+    const gssize required_length = g_checksum_type_get_length(type);
+
+    checksum = purple_cipher_context_get_data(context);
+
+    g_return_val_if_fail(len >= required_length, FALSE);
+    g_return_val_if_fail(checksum != NULL, FALSE);
+
+    g_checksum_get_digest(checksum, digest, &len);
+
+    purple_cipher_context_reset(context, NULL);
+
+    if (out_len)
+        *out_len = len;
+
+    return TRUE;
+}
+
+/******************************************************************************
+ * Macros
+ *****************************************************************************/
+#define PURPLE_G_CHECKSUM_IMPLEMENTATION(lower, camel, type, block_size) \
+	static size_t \
+	lower##_get_block_size(PurpleCipherContext *context) { \
+		return (block_size); \
+	} \
+	\
+	static void \
+	lower##_init(PurpleCipherContext *context, gpointer extra) { \
+		purple_g_checksum_init(context, (type)); \
+	} \
+	\
+	static void \
+	lower##_reset(PurpleCipherContext *context, gpointer extra) { \
+		purple_g_checksum_reset(context, (type)); \
+	} \
+	\
+	static gboolean \
+	lower##_digest(PurpleCipherContext *context, gsize in_len, \
+	                 guchar digest[], size_t *out_len) \
+	{ \
+		return purple_g_checksum_digest(context, (type), in_len, digest, \
+		                                out_len); \
+	} \
+	\
+	static PurpleCipherOps camel##Ops = { \
+		.init = lower##_init, \
+		.reset = lower##_reset, \
+		.uninit = purple_g_checksum_uninit, \
+		.append = purple_g_checksum_append, \
+		.digest = lower##_digest, \
+		.get_block_size = lower##_get_block_size, \
+	}; \
+	\
+	PurpleCipherOps * \
+	purple_##lower##_cipher_get_ops(void) { \
+		return &camel##Ops; \
+	}
+
+/******************************************************************************
+ * Macro Expansion
+ *****************************************************************************/
+PURPLE_G_CHECKSUM_IMPLEMENTATION(md5, MD5, G_CHECKSUM_MD5, 64);
+PURPLE_G_CHECKSUM_IMPLEMENTATION(sha1, SHA1, G_CHECKSUM_SHA1, 64);
+PURPLE_G_CHECKSUM_IMPLEMENTATION(sha256, SHA256, G_CHECKSUM_SHA256, 64);
+
+#endif /* GLIB_CHECK_VERSION(2,16,0) */
+