4 files changed, 139 insertions, 2 deletions

diff --git a/src/gen/types.h b/src/gen/types.h
index 5500e85..da03aeb 100644
--- a/src/gen/types.h
+++ b/src/gen/types.h
@@ -16,9 +16,10 @@
  * @brief
  */
 typedef struct seed_t {
-	char *raw;
-	size_t raw_len;
 	GEN seed;
+	char *hex;
+	size_t hex_len;
+	unsigned char *hash;
 } seed_t;
 
 /**
@@ -84,6 +85,11 @@ typedef struct {
 } arg_t;
 
 /**
+ * @brief
+ */
+typedef enum { ENDIAN_BIG = 0, ENDIAN_LITTLE } endian_e;
+
+/**
  * @brief A generator function type.
  * @param curve A curve_t being generated
  * @param cfg An application config
diff --git a/src/util/binascii.c b/src/util/binascii.c
new file mode 100644
index 0000000..ae3f1ff
--- /dev/null
+++ b/src/util/binascii.c
@@ -0,0 +1,43 @@
+/*
+ * ecgen, tool for generating Elliptic curve domain parameters
+ * Copyright (C) 2017 J08nY
+ */
+#include "binascii.h"
+#include "util/memory.h"
+
+size_t binascii_blen(GEN i) {
+	pari_sp ltop = avma;
+	size_t result = (size_t)glength(binary_2k_nv(i, 8));
+	avma = ltop;
+	return result;
+}
+
+char *binascii_itob(GEN i, endian_e endianity) {
+	pari_sp ltop = avma;
+	GEN digits = binary_2k_nv(i, 8);
+	if (endianity == ENDIAN_LITTLE) {
+		digits = vecsmall_reverse(digits);
+	}
+	long blen = glength(digits);
+	char *result = try_malloc((size_t)blen);
+	for (long j = 1; j <= blen; ++j) {
+		result[j - 1] = (char)gel(digits, j);
+	}
+
+	avma = ltop;
+	return result;
+}
+
+GEN binascii_btoi(const char *bytes, size_t len, endian_e endianity) {
+	pari_sp ltop = avma;
+	GEN result = gen_0;
+	for (size_t i = 0; i < len; ++i) {
+		size_t index = i;
+		if (endianity == ENDIAN_LITTLE) {
+			index = (len - 1) - i;
+		}
+		result = addis(result, bytes[index]);
+		if (i < len - 1) result = shifti(result, 8);
+	}
+	return gerepileupto(ltop, result);
+}
diff --git a/src/util/binascii.h b/src/util/binascii.h
new file mode 100644
index 0000000..3826a6a
--- /dev/null
+++ b/src/util/binascii.h
@@ -0,0 +1,34 @@
+/*
+ * ecgen, tool for generating Elliptic curve domain parameters
+ * Copyright (C) 2017 J08nY
+ */
+#ifndef ECGEN_BINASCII_H
+#define ECGEN_BINASCII_H
+
+#include <pari/pari.h>
+#include "gen/types.h"
+
+/**
+ * @brief
+ * @param i
+ * @return
+ */
+size_t binascii_blen(GEN i);
+
+/**
+ * @brief
+ * @param i
+ * @param endianity
+ * @return
+ */
+char *binascii_itob(GEN i, endian_e endianity);
+
+/**
+ * @brief
+ * @param bytes
+ * @param endianity
+ * @return
+ */
+GEN binascii_btoi(const char *bytes, size_t len, endian_e endianity);
+
+#endif  // ECGEN_BINASCII_H
diff --git a/test/src/util/test_binascii.c b/test/src/util/test_binascii.c
new file mode 100644
index 0000000..47f3f61
--- /dev/null
+++ b/test/src/util/test_binascii.c
@@ -0,0 +1,54 @@
+/*
+ * ecgen, tool for generating Elliptic curve domain parameters
+ * Copyright (C) 2017 J08nY
+ */
+
+#include <criterion/criterion.h>
+#include "test/default.h"
+#include "util/binascii.h"
+#include "util/memory.h"
+
+TestSuite(binascii, .init = default_setup, .fini = default_teardown);
+
+Test(binascii, test_itob_big) {
+	GEN i = stoi((5 << 8) | 4);
+	char *bytes = binascii_itob(i, ENDIAN_BIG);
+	size_t len = binascii_blen(i);
+	cr_assert_eq(len, 2, );
+	cr_assert_eq(bytes[0], 5, );
+	cr_assert_eq(bytes[1], 4, );
+	try_free(bytes);
+}
+
+Test(binascii, test_itob_little) {
+	GEN i = stoi((5 << 8) | 4);
+	char *bytes = binascii_itob(i, ENDIAN_LITTLE);
+	size_t len = binascii_blen(i);
+	cr_assert_eq(len, 2, );
+	cr_assert_eq(bytes[0], 4, );
+	cr_assert_eq(bytes[1], 5, );
+	try_free(bytes);
+}
+
+Test(binascii, test_btoi_big) {
+	char bytes[] = {5, 4};
+	GEN i = binascii_btoi(bytes, 2, ENDIAN_BIG);
+	GEN expected = stoi((5 << 8) | 4);
+	cr_assert(equalii(expected, i), );
+}
+
+Test(binascii, test_btoi_little) {
+	char bytes[] = {5, 4};
+	GEN i = binascii_btoi(bytes, 2, ENDIAN_LITTLE);
+	GEN expected = stoi((4 << 8) | 5);
+	cr_assert(equalii(expected, i), );
+}
+
+Test(binascii, test_both) {
+	GEN expected = stoi((5 << 8) | 4);
+	char *bytes = binascii_itob(expected, ENDIAN_BIG);
+	size_t len = binascii_blen(expected);
+	GEN i = binascii_btoi(bytes, len, ENDIAN_BIG);
+	cr_assert(equalii(expected, i), );
+	try_free(bytes);
+}
\ No newline at end of file