summaryrefslogtreecommitdiff
path: root/ccast/axTLS/crypto_misc.c
diff options
context:
space:
mode:
Diffstat (limited to 'ccast/axTLS/crypto_misc.c')
-rw-r--r--ccast/axTLS/crypto_misc.c367
1 files changed, 367 insertions, 0 deletions
diff --git a/ccast/axTLS/crypto_misc.c b/ccast/axTLS/crypto_misc.c
new file mode 100644
index 0000000..f43fd04
--- /dev/null
+++ b/ccast/axTLS/crypto_misc.c
@@ -0,0 +1,367 @@
+/*
+ * Copyright (c) 2007, Cameron Rich
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * * 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.
+ * * Neither the name of the axTLS project nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * 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 OWNER 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.
+ */
+
+/**
+ * Some misc. routines to help things out
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include "os_port.h"
+#include "crypto_misc.h"
+#ifdef CONFIG_WIN32_USE_CRYPTO_LIB
+#include "wincrypt.h"
+#endif
+
+#ifndef WIN32
+static int rng_fd = -1;
+#elif defined(CONFIG_WIN32_USE_CRYPTO_LIB)
+static HCRYPTPROV gCryptProv;
+#endif
+
+#if (!defined(CONFIG_USE_DEV_URANDOM) && !defined(CONFIG_WIN32_USE_CRYPTO_LIB))
+/* change to processor registers as appropriate */
+#define ENTROPY_POOL_SIZE 32
+#define ENTROPY_COUNTER1 ((((uint64_t)tv.tv_sec)<<32) | tv.tv_usec)
+#define ENTROPY_COUNTER2 rand()
+static uint8_t entropy_pool[ENTROPY_POOL_SIZE];
+#endif
+
+const char * const unsupported_str = "Error: Feature not supported";
+
+#ifndef CONFIG_SSL_SKELETON_MODE
+/**
+ * Retrieve a file and put it into memory
+ * @return The size of the file, or -1 on failure.
+ */
+int get_file(const char *filename, uint8_t **buf)
+{
+ int total_bytes = 0;
+ int bytes_read = 0;
+ int filesize;
+ FILE *stream = fopen(filename, "rb");
+
+ if (stream == NULL)
+ {
+#ifdef CONFIG_SSL_FULL_MODE
+ printf("file '%s' does not exist\n", filename); TTY_FLUSH();
+#endif
+ return -1;
+ }
+
+ /* Win CE doesn't support stat() */
+ fseek(stream, 0, SEEK_END);
+ filesize = ftell(stream);
+ *buf = (uint8_t *)malloc(filesize);
+ fseek(stream, 0, SEEK_SET);
+
+ do
+ {
+ bytes_read = fread(*buf+total_bytes, 1, filesize-total_bytes, stream);
+ total_bytes += bytes_read;
+ } while (total_bytes < filesize && bytes_read > 0);
+
+ fclose(stream);
+ return filesize;
+}
+#endif
+
+/**
+ * Initialise the Random Number Generator engine.
+ * - On Win32 use the platform SDK's crypto engine.
+ * - On Linux use /dev/urandom
+ * - If none of these work then use a custom RNG.
+ */
+EXP_FUNC void STDCALL RNG_initialize()
+{
+#if !defined(WIN32) && defined(CONFIG_USE_DEV_URANDOM)
+ rng_fd = ax_open("/dev/urandom", O_RDONLY);
+#elif defined(WIN32) && defined(CONFIG_WIN32_USE_CRYPTO_LIB)
+ if (!CryptAcquireContext(&gCryptProv,
+ NULL, NULL, PROV_RSA_FULL, 0))
+ {
+ if (GetLastError() == NTE_BAD_KEYSET &&
+ !CryptAcquireContext(&gCryptProv,
+ NULL,
+ NULL,
+ PROV_RSA_FULL,
+ CRYPT_NEWKEYSET))
+ {
+ printf("CryptoLib: %x\n", GetLastError());
+ exit(1);
+ }
+ }
+#else
+ /* start of with a stack to copy across */
+ int i = 0;
+ memcpy(entropy_pool, &i, ENTROPY_POOL_SIZE);
+ srand((unsigned int)(size_t)&i);
+#endif
+}
+
+/**
+ * If no /dev/urandom, then initialise the RNG with something interesting.
+ */
+EXP_FUNC void STDCALL RNG_custom_init(const uint8_t *seed_buf, int size)
+{
+#if defined(WIN32) || defined(CONFIG_WIN32_USE_CRYPTO_LIB)
+ int i;
+
+ for (i = 0; i < ENTROPY_POOL_SIZE && i < size; i++)
+ entropy_pool[i] ^= seed_buf[i];
+#endif
+}
+
+/**
+ * Terminate the RNG engine.
+ */
+EXP_FUNC void STDCALL RNG_terminate(void)
+{
+#ifndef WIN32
+ close(rng_fd);
+#elif defined(CONFIG_WIN32_USE_CRYPTO_LIB)
+ CryptReleaseContext(gCryptProv, 0);
+#endif
+}
+
+/**
+ * Set a series of bytes with a random number. Individual bytes can be 0
+ */
+EXP_FUNC void STDCALL get_random(int num_rand_bytes, uint8_t *rand_data)
+{
+#if !defined(WIN32) && defined(CONFIG_USE_DEV_URANDOM)
+ /* use the Linux default */
+ read(rng_fd, rand_data, num_rand_bytes); /* read from /dev/urandom */
+#elif defined(WIN32) && defined(CONFIG_WIN32_USE_CRYPTO_LIB)
+ /* use Microsoft Crypto Libraries */
+ CryptGenRandom(gCryptProv, num_rand_bytes, rand_data);
+#else /* nothing else to use, so use a custom RNG */
+ /* The method we use when we've got nothing better. Use RC4, time
+ and a couple of random seeds to generate a random sequence */
+ RC4_CTX rng_ctx;
+ struct timeval tv;
+ MD5_CTX rng_digest_ctx;
+ uint8_t digest[MD5_SIZE];
+ uint64_t *ep;
+ int i;
+
+ /* A proper implementation would use counters etc for entropy */
+ gettimeofday(&tv, NULL);
+ ep = (uint64_t *)entropy_pool;
+ ep[0] ^= ENTROPY_COUNTER1;
+ ep[1] ^= ENTROPY_COUNTER2;
+
+ /* use a digested version of the entropy pool as a key */
+ MD5_Init(&rng_digest_ctx);
+ MD5_Update(&rng_digest_ctx, entropy_pool, ENTROPY_POOL_SIZE);
+ MD5_Final(digest, &rng_digest_ctx);
+
+ /* come up with the random sequence */
+ RC4_setup(&rng_ctx, digest, MD5_SIZE); /* use as a key */
+ memcpy(rand_data, entropy_pool, num_rand_bytes < ENTROPY_POOL_SIZE ?
+ num_rand_bytes : ENTROPY_POOL_SIZE);
+ RC4_crypt(&rng_ctx, rand_data, rand_data, num_rand_bytes);
+
+ /* move things along */
+ for (i = ENTROPY_POOL_SIZE-1; i >= MD5_SIZE ; i--)
+ entropy_pool[i] = entropy_pool[i-MD5_SIZE];
+
+ /* insert the digest at the start of the entropy pool */
+ memcpy(entropy_pool, digest, MD5_SIZE);
+#endif
+}
+
+/**
+ * Set a series of bytes with a random number. Individual bytes are not zero.
+ */
+void get_random_NZ(int num_rand_bytes, uint8_t *rand_data)
+{
+ int i;
+ get_random(num_rand_bytes, rand_data);
+
+ for (i = 0; i < num_rand_bytes; i++)
+ {
+ while (rand_data[i] == 0) /* can't be 0 */
+ rand_data[i] = (uint8_t)(rand());
+ }
+}
+
+/**
+ * Some useful diagnostic routines
+ */
+#if defined(CONFIG_SSL_FULL_MODE) || defined(CONFIG_DEBUG)
+int hex_finish;
+int hex_index;
+
+static void print_hex_init(int finish)
+{
+ hex_finish = finish;
+ hex_index = 0;
+}
+
+static void print_hex(uint8_t hex)
+{
+ static int column;
+
+ if (hex_index == 0)
+ {
+ column = 0;
+ }
+
+ printf("%02x ", hex);
+ if (++column == 8)
+ {
+ printf(": ");
+ }
+ else if (column >= 16)
+ {
+ printf("\n");
+ column = 0;
+ }
+
+ if (++hex_index >= hex_finish && column > 0)
+ {
+ printf("\n");
+ }
+}
+
+/**
+ * Spit out a blob of data for diagnostics. The data is is a nice column format
+ * for easy reading.
+ *
+ * @param format [in] The string (with possible embedded format characters)
+ * @param size [in] The number of numbers to print
+ * @param data [in] The start of data to use
+ * @param ... [in] Any additional arguments
+ */
+EXP_FUNC void STDCALL print_blob(const char *format,
+ const uint8_t *data, int size, ...)
+{
+ int i;
+ char tmp[80];
+ va_list(ap);
+
+ va_start(ap, size);
+ sprintf(tmp, "%s\n", format);
+ vprintf(tmp, ap);
+ print_hex_init(size);
+ for (i = 0; i < size; i++)
+ {
+ print_hex(data[i]);
+ }
+
+ va_end(ap);
+ TTY_FLUSH();
+}
+#elif defined(WIN32)
+/* VC6.0 doesn't handle variadic macros */
+EXP_FUNC void STDCALL print_blob(const char *format, const uint8_t *data,
+ int size, ...) {}
+#endif
+
+#if defined(CONFIG_SSL_HAS_PEM) || defined(CONFIG_HTTP_HAS_AUTHORIZATION)
+/* base64 to binary lookup table */
+static const uint8_t map[128] =
+{
+ 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+ 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+ 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+ 255, 255, 255, 255, 255, 255, 255, 62, 255, 255, 255, 63,
+ 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255,
+ 255, 254, 255, 255, 255, 0, 1, 2, 3, 4, 5, 6,
+ 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
+ 19, 20, 21, 22, 23, 24, 25, 255, 255, 255, 255, 255,
+ 255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36,
+ 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
+ 49, 50, 51, 255, 255, 255, 255, 255
+};
+
+EXP_FUNC int STDCALL base64_decode(const char *in, int len,
+ uint8_t *out, int *outlen)
+{
+ int g, t, x, y, z;
+ uint8_t c;
+ int ret = -1;
+
+ g = 3;
+ for (x = y = z = t = 0; x < len; x++)
+ {
+ if ((c = map[in[x]&0x7F]) == 0xff)
+ continue;
+
+ if (c == 254) /* this is the end... */
+ {
+ c = 0;
+
+ if (--g < 0)
+ goto error;
+ }
+ else if (g != 3) /* only allow = at end */
+ goto error;
+
+ t = (t<<6) | c;
+
+ if (++y == 4)
+ {
+ out[z++] = (uint8_t)((t>>16)&255);
+
+ if (g > 1)
+ out[z++] = (uint8_t)((t>>8)&255);
+
+ if (g > 2)
+ out[z++] = (uint8_t)(t&255);
+
+ y = t = 0;
+ }
+
+ /* check that we don't go past the output buffer */
+ if (z > *outlen)
+ goto error;
+ }
+
+ if (y != 0)
+ goto error;
+
+ *outlen = z;
+ ret = 0;
+
+error:
+#ifdef CONFIG_SSL_FULL_MODE
+ if (ret < 0)
+ printf("Error: Invalid base64\n"); TTY_FLUSH();
+#endif
+ TTY_FLUSH();
+ return ret;
+
+}
+#endif
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-19 19:37:39 +0000