X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=libtomcrypt%2Fsrc%2Fpk%2Fasn1%2Fder%2Futf8%2Fder_encode_utf8_string.c;fp=libtomcrypt%2Fsrc%2Fpk%2Fasn1%2Fder%2Futf8%2Fder_encode_utf8_string.c;h=4c2030ff4f75425a97df5650ead42cc47e30376d;hb=66bc25938679f1d6a1d1200f329093d82a5e99b4;hp=0000000000000000000000000000000000000000;hpb=a52ee0733f420ca20224049260d6fc5cf7d8f621;p=zpackage

diff --git a/libtomcrypt/src/pk/asn1/der/utf8/der_encode_utf8_string.c b/libtomcrypt/src/pk/asn1/der/utf8/der_encode_utf8_string.c
new file mode 100644
index 0000000..4c2030f
--- /dev/null
+++ b/libtomcrypt/src/pk/asn1/der/utf8/der_encode_utf8_string.c
@@ -0,0 +1,104 @@
+/* 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_utf8_string.c
+  ASN.1 DER, encode a UTF8 STRING, Tom St Denis
+*/
+
+
+#ifdef LTC_DER
+
+/**
+  Store an UTF8 STRING
+  @param in       The array of UTF8 to store (one per wchar_t)
+  @param inlen    The number of UTF8 to store
+  @param out      [out] The destination for the DER encoded UTF8 STRING
+  @param outlen   [in/out] The max size and resulting size of the DER UTF8 STRING
+  @return CRYPT_OK if successful
+*/
+int der_encode_utf8_string(const wchar_t *in,  unsigned long inlen,
+                           unsigned char *out, unsigned long *outlen)
+{
+   unsigned long x, y, len;
+
+   LTC_ARGCHK(in     != NULL);
+   LTC_ARGCHK(out    != NULL);
+   LTC_ARGCHK(outlen != NULL);
+
+   /* get the size */
+   for (x = len = 0; x < inlen; x++) {
+       if (!der_utf8_valid_char(in[x])) return CRYPT_INVALID_ARG;
+       len += der_utf8_charsize(in[x]);
+   }
+
+   if (len < 128) {
+      y = 2 + len;
+   } else if (len < 256) {
+      y = 3 + len;
+   } else if (len < 65536UL) {
+      y = 4 + len;
+   } else if (len < 16777216UL) {
+      y = 5 + len;
+   } else {
+      return CRYPT_INVALID_ARG;
+   }
+
+   /* too big? */
+   if (y > *outlen) {
+      *outlen = y;
+      return CRYPT_BUFFER_OVERFLOW;
+   }
+
+   /* encode the header+len */
+   x = 0;
+   out[x++] = 0x0C;
+   if (len < 128) {
+      out[x++] = (unsigned char)len;
+   } else if (len < 256) {
+      out[x++] = 0x81;
+      out[x++] = (unsigned char)len;
+   } else if (len < 65536UL) {
+      out[x++] = 0x82;
+      out[x++] = (unsigned char)((len>>8)&255);
+      out[x++] = (unsigned char)(len&255);
+   } else if (len < 16777216UL) {
+      out[x++] = 0x83;
+      out[x++] = (unsigned char)((len>>16)&255);
+      out[x++] = (unsigned char)((len>>8)&255);
+      out[x++] = (unsigned char)(len&255);
+   } else {
+       /* coverity[dead_error_line] */
+      return CRYPT_INVALID_ARG;
+   }
+
+   /* store UTF8 */
+   for (y = 0; y < inlen; y++) {
+       switch (der_utf8_charsize(in[y])) {
+          case 1: out[x++] = (unsigned char)in[y]; break;
+          case 2: out[x++] = 0xC0 | ((in[y] >> 6) & 0x1F);  out[x++] = 0x80 | (in[y] & 0x3F); break;
+          case 3: out[x++] = 0xE0 | ((in[y] >> 12) & 0x0F); out[x++] = 0x80 | ((in[y] >> 6) & 0x3F); out[x++] = 0x80 | (in[y] & 0x3F); break;
+#if !defined(LTC_WCHAR_MAX) || LTC_WCHAR_MAX > 0xFFFF
+          case 4: out[x++] = 0xF0 | ((in[y] >> 18) & 0x07); out[x++] = 0x80 | ((in[y] >> 12) & 0x3F); out[x++] = 0x80 | ((in[y] >> 6) & 0x3F); out[x++] = 0x80 | (in[y] & 0x3F); break;
+#endif
+       }
+   }
+
+   /* retun length */
+   *outlen = x;
+
+   return CRYPT_OK;
+}
+
+#endif
+
+/* ref:         $Format:%D$ */
+/* git commit:  $Format:%H$ */
+/* commit time: $Format:%ai$ */