1 files changed, 113 insertions, 0 deletions
diff --git a/src/lib/crypto/mem_ossl.cpp b/src/lib/crypto/mem_ossl.cpp
new file mode 100644
index 0000000..e9d6a93
--- /dev/null
+++ b/src/lib/crypto/mem_ossl.cpp
@@ -0,0 +1,113 @@
+/*-
+ * Copyright (c) 2021 Ribose Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <cstdio>
+#include <cstring>
+#include "mem.h"
+#include "logging.h"
+#include <openssl/crypto.h>
+
+void
+secure_clear(void *vp, size_t size)
+{
+    OPENSSL_cleanse(vp, size);
+}
+
+namespace rnp {
+
+bool
+hex_encode(const uint8_t *buf, size_t buf_len, char *hex, size_t hex_len, hex_format_t format)
+{
+    if (hex_len < (buf_len * 2 + 1)) {
+        return false;
+    }
+    static const char *hex_low = "0123456789abcdef";
+    static const char *hex_up = "0123456789ABCDEF";
+    const char *       hex_ch = (format == HEX_LOWERCASE) ? hex_low : hex_up;
+    hex[buf_len * 2] = '\0';
+    for (size_t i = 0; i < buf_len; i++) {
+        hex[i << 1] = hex_ch[buf[i] >> 4];
+        hex[(i << 1) + 1] = hex_ch[buf[i] & 0xF];
+    }
+    return true;
+}
+
+static bool
+hex_char_decode(const char hex, uint8_t &res)
+{
+    if ((hex >= '0') && (hex <= '9')) {
+        res = hex - '0';
+        return true;
+    }
+    if (hex >= 'a' && hex <= 'f') {
+        res = hex + 10 - 'a';
+        return true;
+    }
+    if (hex >= 'A' && hex <= 'F') {
+        res = hex + 10 - 'A';
+        return true;
+    }
+    return false;
+}
+
+size_t
+hex_decode(const char *hex, uint8_t *buf, size_t buf_len)
+{
+    size_t hexlen = strlen(hex);
+
+    /* check for 0x prefix */
+    if ((hexlen >= 2) && (hex[0] == '0') && ((hex[1] == 'x') || (hex[1] == 'X'))) {
+        hex += 2;
+        hexlen -= 2;
+    }
+    const char *end = hex + hexlen;
+    uint8_t *   buf_st = buf;
+    uint8_t *   buf_en = buf + buf_len;
+    while (hex < end) {
+        /* skip whitespaces */
+        if ((*hex < '0') &&
+            ((*hex == ' ') || (*hex == '\t') || (*hex == '\r') || (*hex == '\n'))) {
+            hex++;
+            continue;
+        }
+        if (hexlen < 2) {
+            RNP_LOG("Invalid hex string length.");
+            return 0;
+        }
+        uint8_t lo, hi;
+        if (!hex_char_decode(*hex++, hi) || !hex_char_decode(*hex++, lo)) {
+            RNP_LOG("Hex decode failed on string: %s", hex);
+            return 0;
+        }
+        if (buf == buf_en) {
+            return 0;
+        }
+        *buf++ = (hi << 4) | lo;
+    }
+    return buf - buf_st;
+}
+
+} // namespace rnp