Add initial crypto functionality

[libcontrac.git] / src / utils.c

diff --git a/src/utils.c b/src/utils.c
new file mode 100644 (file)
index 0000000..1fbb716
--- /dev/null
+++ b/src/utils.c
@@ -0,0 +1,69 @@
+/** \ingroup contrac
+ * @file
+ * @author     David Llewellyn-Jones
+ * @version    $(VERSION)
+ *
+ * @section LICENSE
+ *
+ *
+ *
+ * @brief
+ * @section DESCRIPTION
+ *
+ *
+ *
+ */
+
+// Includes
+
+#include <openssl/evp.h>
+
+// Defines
+
+// Structures
+
+// Function prototypes
+
+// Function definitions
+
+// Function definitions
+
+size_t base64_encode_size(size_t binary_input) {
+       return (((size_t)((binary_input + 2) / 3)) * 4) + 1;
+}
+
+size_t base64_decode_size(size_t base64_input) {
+       return (((size_t)((base64_input + 3) / 4)) * 3) + 1;
+}
+
+void base64_encode_binary_to_base64(unsigned char const *input, size_t input_size, unsigned char *output, size_t *output_size) {
+       size_t size_in;
+       size_t size_out;
+
+       size_in = input_size;
+       size_out = base64_encode_size(input_size);
+       
+       if (size_out > *output_size) {
+               size_in = base64_decode_size(*output_size - 1) - 1;
+       }
+       *output_size = base64_encode_size(size_in);
+
+       EVP_EncodeBlock(output, input, size_in);
+}
+
+void base64_decode_base64_to_binary(unsigned char const *input, size_t input_size, unsigned char *output, size_t *output_size) {
+       size_t size_in;
+       size_t size_out;
+
+       size_in = input_size;
+       size_out = base64_decode_size(input_size);
+       
+       if (size_out > *output_size) {
+               size_in = base64_encode_size(*output_size - 1) - 1;
+       }
+       *output_size = base64_decode_size(size_in);
+
+       EVP_DecodeBlock(output, input, size_in);
+}
+
+