diff options
Diffstat (limited to 'src/lib/crypto/mem_ossl.cpp')
-rw-r--r-- | src/lib/crypto/mem_ossl.cpp | 113 |
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 |