Mercurial > dropbear
view libtomcrypt/src/pk/asn1/der/utf8/der_encode_utf8_string.c @ 553:8711f20b89ab
- For uclinux, only cleanup on exit for the main process. This avoids
trashing the state when a failing child exits.
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Thu, 09 Jul 2009 16:01:30 +0000 |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
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/* 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. * * Tom St Denis, [email protected], http://libtomcrypt.com */ #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 (in[x] < 0 || in[x] > 0x1FFFF) { 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 = len; return CRYPT_BUFFER_OVERFLOW; } /* encode the header+len */ x = 0; out[x++] = 0x0C; if (len < 128) { out[x++] = len; } else if (len < 256) { out[x++] = 0x81; out[x++] = len; } else if (len < 65536UL) { out[x++] = 0x82; out[x++] = (len>>8)&255; out[x++] = len&255; } else if (len < 16777216UL) { out[x++] = 0x83; out[x++] = (len>>16)&255; out[x++] = (len>>8)&255; out[x++] = len&255; } else { return CRYPT_INVALID_ARG; } /* store UTF8 */ for (y = 0; y < inlen; y++) { switch (der_utf8_charsize(in[y])) { case 1: out[x++] = 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; 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; } } /* retun length */ *outlen = x; return CRYPT_OK; } #endif /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/utf8/der_encode_utf8_string.c,v $ */ /* $Revision: 1.7 $ */ /* $Date: 2006/12/16 17:41:21 $ */