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thirdparty/libtomcrypt/pk/asn1/der/short_integer/der_decode_short_integer.c

@@ -0,0 +1,66 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ */
+#include "tomcrypt.h"
+
+/**
+  @file der_decode_short_integer.c
+  ASN.1 DER, decode an integer, Tom St Denis
+*/
+
+
+#ifdef LTC_DER
+
+/**
+  Read a short integer
+  @param in       The DER encoded data
+  @param inlen    Size of data
+  @param num      [out] The integer to decode
+  @return CRYPT_OK if successful
+*/
+int der_decode_short_integer(const unsigned char *in, unsigned long inlen, unsigned long *num)
+{
+   unsigned long len, x, y;
+
+   LTC_ARGCHK(num    != NULL);
+   LTC_ARGCHK(in     != NULL);
+
+   /* check length */
+   if (inlen < 2) {
+      return CRYPT_INVALID_PACKET;
+   }
+
+   /* check header */
+   x = 0;
+   if ((in[x++] & 0x1F) != 0x02) {
+      return CRYPT_INVALID_PACKET;
+   }
+
+   /* get the packet len */
+   len = in[x++];
+
+   if (x + len > inlen) {
+      return CRYPT_INVALID_PACKET;
+   }
+
+   /* read number */
+   y = 0;
+   while (len--) {
+      y = (y<<8) | (unsigned long)in[x++];
+   }
+   *num = y;
+
+   return CRYPT_OK;
+
+}
+
+#endif
+
+/* ref:         HEAD -> master, tag: v1.18.2 */
+/* git commit:  7e7eb695d581782f04b24dc444cbfde86af59853 */
+/* commit time: 2018-07-01 22:49:01 +0200 */

thirdparty/libtomcrypt/pk/asn1/der/short_integer/der_encode_short_integer.c

@@ -0,0 +1,95 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ */
+#include "tomcrypt.h"
+
+/**
+  @file der_encode_short_integer.c
+  ASN.1 DER, encode an integer, Tom St Denis
+*/
+
+
+#ifdef LTC_DER
+
+/**
+  Store a short integer in the range (0,2^32-1)
+  @param num      The integer to encode
+  @param out      [out] The destination for the DER encoded integers
+  @param outlen   [in/out] The max size and resulting size of the DER encoded integers
+  @return CRYPT_OK if successful
+*/
+int der_encode_short_integer(unsigned long num, unsigned char *out, unsigned long *outlen)
+{
+   unsigned long len, x, y, z;
+   int           err;
+
+   LTC_ARGCHK(out    != NULL);
+   LTC_ARGCHK(outlen != NULL);
+
+   /* force to 32 bits */
+   num &= 0xFFFFFFFFUL;
+
+   /* find out how big this will be */
+   if ((err = der_length_short_integer(num, &len)) != CRYPT_OK) {
+      return err;
+   }
+
+   if (*outlen < len) {
+      *outlen = len;
+      return CRYPT_BUFFER_OVERFLOW;
+   }
+
+   /* get len of output */
+   z = 0;
+   y = num;
+   while (y) {
+     ++z;
+     y >>= 8;
+   }
+
+   /* handle zero */
+   if (z == 0) {
+      z = 1;
+   }
+
+   /* see if msb is set */
+   z += (num&(1UL<<((z<<3) - 1))) ? 1 : 0;
+
+   /* adjust the number so the msB is non-zero */
+   for (x = 0; (z <= 4) && (x < (4 - z)); x++) {
+      num <<= 8;
+   }
+
+   /* store header */
+   x = 0;
+   out[x++] = 0x02;
+   out[x++] = (unsigned char)z;
+
+   /* if 31st bit is set output a leading zero and decrement count */
+   if (z == 5) {
+      out[x++] = 0;
+      --z;
+   }
+
+   /* store values */
+   for (y = 0; y < z; y++) {
+      out[x++] = (unsigned char)((num >> 24) & 0xFF);
+      num    <<= 8;
+   }
+
+   /* we good */
+   *outlen = x;
+
+   return CRYPT_OK;
+}
+
+#endif
+
+/* ref:         HEAD -> master, tag: v1.18.2 */
+/* git commit:  7e7eb695d581782f04b24dc444cbfde86af59853 */
+/* commit time: 2018-07-01 22:49:01 +0200 */

thirdparty/libtomcrypt/pk/asn1/der/short_integer/der_length_short_integer.c

@@ -0,0 +1,68 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ */
+#include "tomcrypt.h"
+
+/**
+  @file der_length_short_integer.c
+  ASN.1 DER, get length of encoding, Tom St Denis
+*/
+
+
+#ifdef LTC_DER
+/**
+  Gets length of DER encoding of num
+  @param num    The integer to get the size of
+  @param outlen [out] The length of the DER encoding for the given integer
+  @return CRYPT_OK if successful
+*/
+int der_length_short_integer(unsigned long num, unsigned long *outlen)
+{
+   unsigned long z, y, len;
+
+   LTC_ARGCHK(outlen  != NULL);
+
+   /* force to 32 bits */
+   num &= 0xFFFFFFFFUL;
+
+   /* get the number of bytes */
+   z = 0;
+   y = num;
+   while (y) {
+     ++z;
+     y >>= 8;
+   }
+
+   /* handle zero */
+   if (z == 0) {
+      z = 1;
+   }
+
+   /* we need a 0x02 to indicate it's INTEGER */
+   len = 1;
+
+   /* length byte */
+   ++len;
+
+   /* bytes in value */
+   len += z;
+
+   /* see if msb is set */
+   len += (num&(1UL<<((z<<3) - 1))) ? 1 : 0;
+
+   /* return length */
+   *outlen = len;
+
+   return CRYPT_OK;
+}
+
+#endif
+
+/* ref:         HEAD -> master, tag: v1.18.2 */
+/* git commit:  7e7eb695d581782f04b24dc444cbfde86af59853 */
+/* commit time: 2018-07-01 22:49:01 +0200 */