X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=libtomcrypt%2Fsrc%2Fpk%2Fasn1%2Fder%2Fobject_identifier%2Fder_decode_object_identifier.c;fp=libtomcrypt%2Fsrc%2Fpk%2Fasn1%2Fder%2Fobject_identifier%2Fder_decode_object_identifier.c;h=75bc127cdd834f5d881abca3a82ebfdc7fc84f8b;hb=66bc25938679f1d6a1d1200f329093d82a5e99b4;hp=0000000000000000000000000000000000000000;hpb=a52ee0733f420ca20224049260d6fc5cf7d8f621;p=zpackage

diff --git a/libtomcrypt/src/pk/asn1/der/object_identifier/der_decode_object_identifier.c b/libtomcrypt/src/pk/asn1/der/object_identifier/der_decode_object_identifier.c
new file mode 100644
index 0000000..75bc127
--- /dev/null
+++ b/libtomcrypt/src/pk/asn1/der/object_identifier/der_decode_object_identifier.c
@@ -0,0 +1,106 @@
+/* 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_object_identifier.c
+  ASN.1 DER, Decode Object Identifier, Tom St Denis
+*/
+
+#ifdef LTC_DER
+/**
+  Decode OID data and store the array of integers in words
+  @param in      The OID DER encoded data
+  @param inlen   The length of the OID data
+  @param words   [out] The destination of the OID words
+  @param outlen  [in/out] The number of OID words
+  @return CRYPT_OK if successful
+*/
+int der_decode_object_identifier(const unsigned char *in,    unsigned long  inlen,
+                                       unsigned long *words, unsigned long *outlen)
+{
+   unsigned long x, y, t, len;
+   int err;
+
+   LTC_ARGCHK(in     != NULL);
+   LTC_ARGCHK(words  != NULL);
+   LTC_ARGCHK(outlen != NULL);
+
+   /* header is at least 3 bytes */
+   if (inlen < 3) {
+      return CRYPT_INVALID_PACKET;
+   }
+
+   /* must be room for at least two words */
+   if (*outlen < 2) {
+      *outlen = 2;
+      return CRYPT_BUFFER_OVERFLOW;
+   }
+
+   /* decode the packet header */
+   x = 0;
+   if ((in[x++] & 0x1F) != 0x06) {
+      return CRYPT_INVALID_PACKET;
+   }
+
+   /* get the length */
+   if (in[x] < 128) {
+      len = in[x++];
+   } else {
+      if (in[x] < 0x81 || in[x] > 0x82) {
+         return CRYPT_INVALID_PACKET;
+      }
+      y   = in[x++] & 0x7F;
+      len = 0;
+      while (y--) {
+         len = (len << 8) | (unsigned long)in[x++];
+      }
+   }
+
+   if (len < 1 || (len + x) > inlen) {
+      return CRYPT_INVALID_PACKET;
+   }
+
+   /* decode words */
+   y = 0;
+   t = 0;
+   while (len--) {
+      t = (t << 7) | (in[x] & 0x7F);
+      if (!(in[x++] & 0x80)) {
+         /* store t */
+         if (y >= *outlen) {
+            y++;
+         } else {
+            if (y == 0) {
+               words[0] = t / 40;
+               words[1] = t % 40;
+               y = 2;
+            } else {
+               words[y++] = t;
+            }
+         }
+         t = 0;
+      }
+   }
+
+   if (y > *outlen) {
+      err =  CRYPT_BUFFER_OVERFLOW;
+   } else {
+      err =  CRYPT_OK;
+   }
+
+   *outlen = y;
+   return err;
+}
+
+#endif
+
+/* ref:         $Format:%D$ */
+/* git commit:  $Format:%H$ */
+/* commit time: $Format:%ai$ */