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author | markm <markm@FreeBSD.org> | 2000-01-09 20:58:00 +0000 |
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committer | markm <markm@FreeBSD.org> | 2000-01-09 20:58:00 +0000 |
commit | 4ecbd6db44d79348bc815f31096e53104f50838b (patch) | |
tree | 36fa73706fa0587a390c45a3fbf17c9523cb0e35 /crypto/heimdal/lib/asn1/der_put.c | |
download | FreeBSD-src-4ecbd6db44d79348bc815f31096e53104f50838b.zip FreeBSD-src-4ecbd6db44d79348bc815f31096e53104f50838b.tar.gz |
Import KTH Heimdal, which will be the core of our Kerberos5.
Userland to follow.
Diffstat (limited to 'crypto/heimdal/lib/asn1/der_put.c')
-rw-r--r-- | crypto/heimdal/lib/asn1/der_put.c | 310 |
1 files changed, 310 insertions, 0 deletions
diff --git a/crypto/heimdal/lib/asn1/der_put.c b/crypto/heimdal/lib/asn1/der_put.c new file mode 100644 index 0000000..ce21654 --- /dev/null +++ b/crypto/heimdal/lib/asn1/der_put.c @@ -0,0 +1,310 @@ +/* + * Copyright (c) 1997, 1998, 1999 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. 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. + * + * 3. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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. + */ + +#include "der_locl.h" + +RCSID("$Id: der_put.c,v 1.22 1999/12/02 17:05:02 joda Exp $"); + +/* + * All encoding functions take a pointer `p' to first position in + * which to write, from the right, `len' which means the maximum + * number of characters we are able to write and return an int + * indicating how many actually got written, or <0 in case of errors. + */ + +static int +der_put_unsigned (unsigned char *p, size_t len, unsigned val, size_t *size) +{ + unsigned char *base = p; + + if (val) { + while (len > 0 && val) { + *p-- = val % 256; + val /= 256; + --len; + } + if (val != 0) + return ASN1_OVERFLOW; + else { + *size = base - p; + return 0; + } + } else if (len < 1) + return ASN1_OVERFLOW; + else { + *p = 0; + *size = 1; + return 0; + } +} + +int +der_put_int (unsigned char *p, size_t len, int val, size_t *size) +{ + unsigned char *base = p; + + if(val >= 0) { + do { + if(len < 1) + return ASN1_OVERFLOW; + *p-- = val % 256; + len--; + val /= 256; + } while(val); + if(p[1] >= 128) { + if(len < 1) + return ASN1_OVERFLOW; + *p-- = 0; + len--; + } + } else { + val = ~val; + do { + if(len < 1) + return ASN1_OVERFLOW; + *p-- = ~(val % 256); + len--; + val /= 256; + } while(val); + if(p[1] < 128) { + if(len < 1) + return ASN1_OVERFLOW; + *p-- = 0xff; + len--; + } + } + *size = base - p; + return 0; +} + + +int +der_put_length (unsigned char *p, size_t len, size_t val, size_t *size) +{ + if (val < 128) { + if (len < 1) + return ASN1_OVERFLOW; + else { + *p = val; + *size = 1; + return 0; + } + } else { + size_t l; + int e; + + e = der_put_unsigned (p, len - 1, val, &l); + if (e) + return e; + p -= l; + *p = 0x80 | l; + *size = l + 1; + return 0; + } +} + +int +der_put_general_string (unsigned char *p, size_t len, + const general_string *str, size_t *size) +{ + size_t slen = strlen(*str); + + if (len < slen) + return ASN1_OVERFLOW; + p -= slen; + len -= slen; + memcpy (p+1, *str, slen); + *size = slen; + return 0; +} + +int +der_put_octet_string (unsigned char *p, size_t len, + const octet_string *data, size_t *size) +{ + if (len < data->length) + return ASN1_OVERFLOW; + p -= data->length; + len -= data->length; + memcpy (p+1, data->data, data->length); + *size = data->length; + return 0; +} + +int +der_put_tag (unsigned char *p, size_t len, Der_class class, Der_type type, + int tag, size_t *size) +{ + if (len < 1) + return ASN1_OVERFLOW; + *p = (class << 6) | (type << 5) | tag; /* XXX */ + *size = 1; + return 0; +} + +int +der_put_length_and_tag (unsigned char *p, size_t len, size_t len_val, + Der_class class, Der_type type, int tag, size_t *size) +{ + size_t ret = 0; + size_t l; + int e; + + e = der_put_length (p, len, len_val, &l); + if(e) + return e; + p -= l; + len -= l; + ret += l; + e = der_put_tag (p, len, class, type, tag, &l); + if(e) + return e; + p -= l; + len -= l; + ret += l; + *size = ret; + return 0; +} + +int +encode_integer (unsigned char *p, size_t len, const int *data, size_t *size) +{ + int num = *data; + size_t ret = 0; + size_t l; + int e; + + e = der_put_int (p, len, num, &l); + if(e) + return e; + p -= l; + len -= l; + ret += l; + e = der_put_length_and_tag (p, len, l, UNIV, PRIM, UT_Integer, &l); + if (e) + return e; + p -= l; + len -= l; + ret += l; + *size = ret; + return 0; +} + +int +encode_general_string (unsigned char *p, size_t len, + const general_string *data, size_t *size) +{ + size_t ret = 0; + size_t l; + int e; + + e = der_put_general_string (p, len, data, &l); + if (e) + return e; + p -= l; + len -= l; + ret += l; + e = der_put_length_and_tag (p, len, l, UNIV, PRIM, UT_GeneralString, &l); + if (e) + return e; + p -= l; + len -= l; + ret += l; + *size = ret; + return 0; +} + +int +encode_octet_string (unsigned char *p, size_t len, + const octet_string *k, size_t *size) +{ + size_t ret = 0; + size_t l; + int e; + + e = der_put_octet_string (p, len, k, &l); + if (e) + return e; + p -= l; + len -= l; + ret += l; + e = der_put_length_and_tag (p, len, l, UNIV, PRIM, UT_OctetString, &l); + if (e) + return e; + p -= l; + len -= l; + ret += l; + *size = ret; + return 0; +} + +void +time2generalizedtime (time_t t, octet_string *s) +{ + struct tm *tm; + + s->data = malloc(16); + s->length = 15; + tm = gmtime (&t); + sprintf (s->data, "%04d%02d%02d%02d%02d%02dZ", tm->tm_year + 1900, + tm->tm_mon + 1, tm->tm_mday, tm->tm_hour, tm->tm_min, + tm->tm_sec); +} + +int +encode_generalized_time (unsigned char *p, size_t len, + const time_t *t, size_t *size) +{ + size_t ret = 0; + size_t l; + octet_string k; + int e; + + time2generalizedtime (*t, &k); + e = der_put_octet_string (p, len, &k, &l); + free (k.data); + if (e) + return e; + p -= l; + len -= l; + ret += l; + e = der_put_length_and_tag (p, len, k.length, UNIV, PRIM, + UT_GeneralizedTime, &l); + if (e) + return e; + p -= l; + len -= l; + ret += l; + *size = ret; + return 0; +} |