diff options
Diffstat (limited to 'crypto/asn1/tasn_enc.c')
| -rw-r--r-- | crypto/asn1/tasn_enc.c | 690 |
1 files changed, 690 insertions, 0 deletions
diff --git a/crypto/asn1/tasn_enc.c b/crypto/asn1/tasn_enc.c new file mode 100644 index 0000000..25c94aa --- /dev/null +++ b/crypto/asn1/tasn_enc.c @@ -0,0 +1,690 @@ +/* tasn_enc.c */ +/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL + * project 2000. + */ +/* ==================================================================== + * Copyright (c) 2000-2004 The OpenSSL Project. 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. All advertising materials mentioning features or use of this + * software must display the following acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" + * + * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For written permission, please contact + * licensing@OpenSSL.org. + * + * 5. Products derived from this software may not be called "OpenSSL" + * nor may "OpenSSL" appear in their names without prior written + * permission of the OpenSSL Project. + * + * 6. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" + * + * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY + * EXPRESSED 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 OpenSSL PROJECT OR + * ITS 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. + * ==================================================================== + * + * This product includes cryptographic software written by Eric Young + * (eay@cryptsoft.com). This product includes software written by Tim + * Hudson (tjh@cryptsoft.com). + * + */ + + +#include <stddef.h> +#include <string.h> +#include "cryptlib.h" +#include <openssl/asn1.h> +#include <openssl/asn1t.h> +#include <openssl/objects.h> + +static int asn1_i2d_ex_primitive(ASN1_VALUE **pval, unsigned char **out, + const ASN1_ITEM *it, + int tag, int aclass); +static int asn1_set_seq_out(STACK_OF(ASN1_VALUE) *sk, unsigned char **out, + int skcontlen, const ASN1_ITEM *item, + int do_sort, int iclass); +static int asn1_template_ex_i2d(ASN1_VALUE **pval, unsigned char **out, + const ASN1_TEMPLATE *tt, + int tag, int aclass); +static int asn1_item_flags_i2d(ASN1_VALUE *val, unsigned char **out, + const ASN1_ITEM *it, int flags); + +/* Top level i2d equivalents: the 'ndef' variant instructs the encoder + * to use indefinite length constructed encoding, where appropriate + */ + +int ASN1_item_ndef_i2d(ASN1_VALUE *val, unsigned char **out, + const ASN1_ITEM *it) + { + return asn1_item_flags_i2d(val, out, it, ASN1_TFLG_NDEF); + } + +int ASN1_item_i2d(ASN1_VALUE *val, unsigned char **out, const ASN1_ITEM *it) + { + return asn1_item_flags_i2d(val, out, it, 0); + } + +/* Encode an ASN1 item, this is use by the + * standard 'i2d' function. 'out' points to + * a buffer to output the data to. + * + * The new i2d has one additional feature. If the output + * buffer is NULL (i.e. *out == NULL) then a buffer is + * allocated and populated with the encoding. + */ + +static int asn1_item_flags_i2d(ASN1_VALUE *val, unsigned char **out, + const ASN1_ITEM *it, int flags) + { + if (out && !*out) + { + unsigned char *p, *buf; + int len; + len = ASN1_item_ex_i2d(&val, NULL, it, -1, flags); + if (len <= 0) + return len; + buf = OPENSSL_malloc(len); + if (!buf) + return -1; + p = buf; + ASN1_item_ex_i2d(&val, &p, it, -1, flags); + *out = buf; + return len; + } + + return ASN1_item_ex_i2d(&val, out, it, -1, flags); + } + +/* Encode an item, taking care of IMPLICIT tagging (if any). + * This function performs the normal item handling: it can be + * used in external types. + */ + +int ASN1_item_ex_i2d(ASN1_VALUE **pval, unsigned char **out, + const ASN1_ITEM *it, int tag, int aclass) + { + const ASN1_TEMPLATE *tt = NULL; + unsigned char *p = NULL; + int i, seqcontlen, seqlen, ndef = 1; + const ASN1_COMPAT_FUNCS *cf; + const ASN1_EXTERN_FUNCS *ef; + const ASN1_AUX *aux = it->funcs; + ASN1_aux_cb *asn1_cb = 0; + + if ((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval) + return 0; + + if (aux && aux->asn1_cb) + asn1_cb = aux->asn1_cb; + + switch(it->itype) + { + + case ASN1_ITYPE_PRIMITIVE: + if (it->templates) + return asn1_template_ex_i2d(pval, out, it->templates, + tag, aclass); + return asn1_i2d_ex_primitive(pval, out, it, tag, aclass); + break; + + case ASN1_ITYPE_MSTRING: + return asn1_i2d_ex_primitive(pval, out, it, -1, aclass); + + case ASN1_ITYPE_CHOICE: + if (asn1_cb && !asn1_cb(ASN1_OP_I2D_PRE, pval, it)) + return 0; + i = asn1_get_choice_selector(pval, it); + if ((i >= 0) && (i < it->tcount)) + { + ASN1_VALUE **pchval; + const ASN1_TEMPLATE *chtt; + chtt = it->templates + i; + pchval = asn1_get_field_ptr(pval, chtt); + return asn1_template_ex_i2d(pchval, out, chtt, + -1, aclass); + } + /* Fixme: error condition if selector out of range */ + if (asn1_cb && !asn1_cb(ASN1_OP_I2D_POST, pval, it)) + return 0; + break; + + case ASN1_ITYPE_EXTERN: + /* If new style i2d it does all the work */ + ef = it->funcs; + return ef->asn1_ex_i2d(pval, out, it, tag, aclass); + + case ASN1_ITYPE_COMPAT: + /* old style hackery... */ + cf = it->funcs; + if (out) + p = *out; + i = cf->asn1_i2d(*pval, out); + /* Fixup for IMPLICIT tag: note this messes up for tags > 30, + * but so did the old code. Tags > 30 are very rare anyway. + */ + if (out && (tag != -1)) + *p = aclass | tag | (*p & V_ASN1_CONSTRUCTED); + return i; + + case ASN1_ITYPE_NDEF_SEQUENCE: + /* Use indefinite length constructed if requested */ + if (aclass & ASN1_TFLG_NDEF) ndef = 2; + /* fall through */ + + case ASN1_ITYPE_SEQUENCE: + i = asn1_enc_restore(&seqcontlen, out, pval, it); + /* An error occurred */ + if (i < 0) + return 0; + /* We have a valid cached encoding... */ + if (i > 0) + return seqcontlen; + /* Otherwise carry on */ + seqcontlen = 0; + /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */ + if (tag == -1) + { + tag = V_ASN1_SEQUENCE; + /* Retain any other flags in aclass */ + aclass = (aclass & ~ASN1_TFLG_TAG_CLASS) + | V_ASN1_UNIVERSAL; + } + if (asn1_cb && !asn1_cb(ASN1_OP_I2D_PRE, pval, it)) + return 0; + /* First work out sequence content length */ + for (i = 0, tt = it->templates; i < it->tcount; tt++, i++) + { + const ASN1_TEMPLATE *seqtt; + ASN1_VALUE **pseqval; + seqtt = asn1_do_adb(pval, tt, 1); + if (!seqtt) + return 0; + pseqval = asn1_get_field_ptr(pval, seqtt); + /* FIXME: check for errors in enhanced version */ + seqcontlen += asn1_template_ex_i2d(pseqval, NULL, seqtt, + -1, aclass); + } + + seqlen = ASN1_object_size(ndef, seqcontlen, tag); + if (!out) + return seqlen; + /* Output SEQUENCE header */ + ASN1_put_object(out, ndef, seqcontlen, tag, aclass); + for (i = 0, tt = it->templates; i < it->tcount; tt++, i++) + { + const ASN1_TEMPLATE *seqtt; + ASN1_VALUE **pseqval; + seqtt = asn1_do_adb(pval, tt, 1); + if (!seqtt) + return 0; + pseqval = asn1_get_field_ptr(pval, seqtt); + /* FIXME: check for errors in enhanced version */ + asn1_template_ex_i2d(pseqval, out, seqtt, -1, aclass); + } + if (ndef == 2) + ASN1_put_eoc(out); + if (asn1_cb && !asn1_cb(ASN1_OP_I2D_POST, pval, it)) + return 0; + return seqlen; + + default: + return 0; + + } + return 0; + } + +int ASN1_template_i2d(ASN1_VALUE **pval, unsigned char **out, + const ASN1_TEMPLATE *tt) + { + return asn1_template_ex_i2d(pval, out, tt, -1, 0); + } + +static int asn1_template_ex_i2d(ASN1_VALUE **pval, unsigned char **out, + const ASN1_TEMPLATE *tt, int tag, int iclass) + { + int i, ret, flags, ttag, tclass, ndef; + flags = tt->flags; + /* Work out tag and class to use: tagging may come + * either from the template or the arguments, not both + * because this would create ambiguity. Additionally + * the iclass argument may contain some additional flags + * which should be noted and passed down to other levels. + */ + if (flags & ASN1_TFLG_TAG_MASK) + { + /* Error if argument and template tagging */ + if (tag != -1) + /* FIXME: error code here */ + return -1; + /* Get tagging from template */ + ttag = tt->tag; + tclass = flags & ASN1_TFLG_TAG_CLASS; + } + else if (tag != -1) + { + /* No template tagging, get from arguments */ + ttag = tag; + tclass = iclass & ASN1_TFLG_TAG_CLASS; + } + else + { + ttag = -1; + tclass = 0; + } + /* + * Remove any class mask from iflag. + */ + iclass &= ~ASN1_TFLG_TAG_CLASS; + + /* At this point 'ttag' contains the outer tag to use, + * 'tclass' is the class and iclass is any flags passed + * to this function. + */ + + /* if template and arguments require ndef, use it */ + if ((flags & ASN1_TFLG_NDEF) && (iclass & ASN1_TFLG_NDEF)) + ndef = 2; + else ndef = 1; + + if (flags & ASN1_TFLG_SK_MASK) + { + /* SET OF, SEQUENCE OF */ + STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval; + int isset, sktag, skaclass; + int skcontlen, sklen; + ASN1_VALUE *skitem; + + if (!*pval) + return 0; + + if (flags & ASN1_TFLG_SET_OF) + { + isset = 1; + /* 2 means we reorder */ + if (flags & ASN1_TFLG_SEQUENCE_OF) + isset = 2; + } + else isset = 0; + + /* Work out inner tag value: if EXPLICIT + * or no tagging use underlying type. + */ + if ((ttag != -1) && !(flags & ASN1_TFLG_EXPTAG)) + { + sktag = ttag; + skaclass = tclass; + } + else + { + skaclass = V_ASN1_UNIVERSAL; + if (isset) + sktag = V_ASN1_SET; + else sktag = V_ASN1_SEQUENCE; + } + + /* Determine total length of items */ + skcontlen = 0; + for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) + { + skitem = sk_ASN1_VALUE_value(sk, i); + skcontlen += ASN1_item_ex_i2d(&skitem, NULL, + ASN1_ITEM_ptr(tt->item), + -1, iclass); + } + sklen = ASN1_object_size(ndef, skcontlen, sktag); + /* If EXPLICIT need length of surrounding tag */ + if (flags & ASN1_TFLG_EXPTAG) + ret = ASN1_object_size(ndef, sklen, ttag); + else ret = sklen; + + if (!out) + return ret; + + /* Now encode this lot... */ + /* EXPLICIT tag */ + if (flags & ASN1_TFLG_EXPTAG) + ASN1_put_object(out, ndef, sklen, ttag, tclass); + /* SET or SEQUENCE and IMPLICIT tag */ + ASN1_put_object(out, ndef, skcontlen, sktag, skaclass); + /* And the stuff itself */ + asn1_set_seq_out(sk, out, skcontlen, ASN1_ITEM_ptr(tt->item), + isset, iclass); + if (ndef == 2) + { + ASN1_put_eoc(out); + if (flags & ASN1_TFLG_EXPTAG) + ASN1_put_eoc(out); + } + + return ret; + } + + if (flags & ASN1_TFLG_EXPTAG) + { + /* EXPLICIT tagging */ + /* Find length of tagged item */ + i = ASN1_item_ex_i2d(pval, NULL, ASN1_ITEM_ptr(tt->item), + -1, iclass); + if (!i) + return 0; + /* Find length of EXPLICIT tag */ + ret = ASN1_object_size(ndef, i, ttag); + if (out) + { + /* Output tag and item */ + ASN1_put_object(out, ndef, i, ttag, tclass); + ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item), + -1, iclass); + if (ndef == 2) + ASN1_put_eoc(out); + } + return ret; + } + + /* Either normal or IMPLICIT tagging: combine class and flags */ + return ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item), + ttag, tclass | iclass); + +} + +/* Temporary structure used to hold DER encoding of items for SET OF */ + +typedef struct { + unsigned char *data; + int length; + ASN1_VALUE *field; +} DER_ENC; + +static int der_cmp(const void *a, const void *b) + { + const DER_ENC *d1 = a, *d2 = b; + int cmplen, i; + cmplen = (d1->length < d2->length) ? d1->length : d2->length; + i = memcmp(d1->data, d2->data, cmplen); + if (i) + return i; + return d1->length - d2->length; + } + +/* Output the content octets of SET OF or SEQUENCE OF */ + +static int asn1_set_seq_out(STACK_OF(ASN1_VALUE) *sk, unsigned char **out, + int skcontlen, const ASN1_ITEM *item, + int do_sort, int iclass) + { + int i; + ASN1_VALUE *skitem; + unsigned char *tmpdat = NULL, *p = NULL; + DER_ENC *derlst = NULL, *tder; + if (do_sort) + { + /* Don't need to sort less than 2 items */ + if (sk_ASN1_VALUE_num(sk) < 2) + do_sort = 0; + else + { + derlst = OPENSSL_malloc(sk_ASN1_VALUE_num(sk) + * sizeof(*derlst)); + tmpdat = OPENSSL_malloc(skcontlen); + if (!derlst || !tmpdat) + return 0; + } + } + /* If not sorting just output each item */ + if (!do_sort) + { + for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) + { + skitem = sk_ASN1_VALUE_value(sk, i); + ASN1_item_ex_i2d(&skitem, out, item, -1, iclass); + } + return 1; + } + p = tmpdat; + + /* Doing sort: build up a list of each member's DER encoding */ + for (i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++) + { + skitem = sk_ASN1_VALUE_value(sk, i); + tder->data = p; + tder->length = ASN1_item_ex_i2d(&skitem, &p, item, -1, iclass); + tder->field = skitem; + } + + /* Now sort them */ + qsort(derlst, sk_ASN1_VALUE_num(sk), sizeof(*derlst), der_cmp); + /* Output sorted DER encoding */ + p = *out; + for (i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++) + { + memcpy(p, tder->data, tder->length); + p += tder->length; + } + *out = p; + /* If do_sort is 2 then reorder the STACK */ + if (do_sort == 2) + { + for (i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); + i++, tder++) + sk_ASN1_VALUE_set(sk, i, tder->field); + } + OPENSSL_free(derlst); + OPENSSL_free(tmpdat); + return 1; + } + +static int asn1_i2d_ex_primitive(ASN1_VALUE **pval, unsigned char **out, + const ASN1_ITEM *it, int tag, int aclass) + { + int len; + int utype; + int usetag; + int ndef = 0; + + utype = it->utype; + + /* Get length of content octets and maybe find + * out the underlying type. + */ + + len = asn1_ex_i2c(pval, NULL, &utype, it); + + /* If SEQUENCE, SET or OTHER then header is + * included in pseudo content octets so don't + * include tag+length. We need to check here + * because the call to asn1_ex_i2c() could change + * utype. + */ + if ((utype == V_ASN1_SEQUENCE) || (utype == V_ASN1_SET) || + (utype == V_ASN1_OTHER)) + usetag = 0; + else usetag = 1; + + /* -1 means omit type */ + + if (len == -1) + return 0; + + /* -2 return is special meaning use ndef */ + if (len == -2) + { + ndef = 2; + len = 0; + } + + /* If not implicitly tagged get tag from underlying type */ + if (tag == -1) tag = utype; + + /* Output tag+length followed by content octets */ + if (out) + { + if (usetag) + ASN1_put_object(out, ndef, len, tag, aclass); + asn1_ex_i2c(pval, *out, &utype, it); + if (ndef) + ASN1_put_eoc(out); + else + *out += len; + } + + if (usetag) + return ASN1_object_size(ndef, len, tag); + return len; + } + +/* Produce content octets from a structure */ + +int asn1_ex_i2c(ASN1_VALUE **pval, unsigned char *cout, int *putype, + const ASN1_ITEM *it) + { + ASN1_BOOLEAN *tbool = NULL; + ASN1_STRING *strtmp; + ASN1_OBJECT *otmp; + int utype; + unsigned char *cont, c; + int len; + const ASN1_PRIMITIVE_FUNCS *pf; + pf = it->funcs; + if (pf && pf->prim_i2c) + return pf->prim_i2c(pval, cout, putype, it); + + /* Should type be omitted? */ + if ((it->itype != ASN1_ITYPE_PRIMITIVE) + || (it->utype != V_ASN1_BOOLEAN)) + { + if (!*pval) return -1; + } + + if (it->itype == ASN1_ITYPE_MSTRING) + { + /* If MSTRING type set the underlying type */ + strtmp = (ASN1_STRING *)*pval; + utype = strtmp->type; + *putype = utype; + } + else if (it->utype == V_ASN1_ANY) + { + /* If ANY set type and pointer to value */ + ASN1_TYPE *typ; + typ = (ASN1_TYPE *)*pval; + utype = typ->type; + *putype = utype; + pval = (ASN1_VALUE **)&typ->value.ptr; + } + else utype = *putype; + + switch(utype) + { + case V_ASN1_OBJECT: + otmp = (ASN1_OBJECT *)*pval; + cont = otmp->data; + len = otmp->length; + break; + + case V_ASN1_NULL: + cont = NULL; + len = 0; + break; + + case V_ASN1_BOOLEAN: + tbool = (ASN1_BOOLEAN *)pval; + if (*tbool == -1) + return -1; + if (it->utype != V_ASN1_ANY) + { + /* Default handling if value == size field then omit */ + if (*tbool && (it->size > 0)) + return -1; + if (!*tbool && !it->size) + return -1; + } + c = (unsigned char)*tbool; + cont = &c; + len = 1; + break; + + case V_ASN1_BIT_STRING: + return i2c_ASN1_BIT_STRING((ASN1_BIT_STRING *)*pval, + cout ? &cout : NULL); + break; + + case V_ASN1_INTEGER: + case V_ASN1_NEG_INTEGER: + case V_ASN1_ENUMERATED: + case V_ASN1_NEG_ENUMERATED: + /* These are all have the same content format + * as ASN1_INTEGER + */ + return i2c_ASN1_INTEGER((ASN1_INTEGER *)*pval, + cout ? &cout : NULL); + break; + + case V_ASN1_OCTET_STRING: + case V_ASN1_NUMERICSTRING: + case V_ASN1_PRINTABLESTRING: + case V_ASN1_T61STRING: + case V_ASN1_VIDEOTEXSTRING: + case V_ASN1_IA5STRING: + case V_ASN1_UTCTIME: + case V_ASN1_GENERALIZEDTIME: + case V_ASN1_GRAPHICSTRING: + case V_ASN1_VISIBLESTRING: + case V_ASN1_GENERALSTRING: + case V_ASN1_UNIVERSALSTRING: + case V_ASN1_BMPSTRING: + case V_ASN1_UTF8STRING: + case V_ASN1_SEQUENCE: + case V_ASN1_SET: + default: + /* All based on ASN1_STRING and handled the same */ + strtmp = (ASN1_STRING *)*pval; + /* Special handling for NDEF */ + if ((it->size == ASN1_TFLG_NDEF) + && (strtmp->flags & ASN1_STRING_FLAG_NDEF)) + { + if (cout) + { + strtmp->data = cout; + strtmp->length = 0; + } + /* Special return code */ + return -2; + } + cont = strtmp->data; + len = strtmp->length; + + break; + + } + if (cout && len) + memcpy(cout, cont, len); + return len; + } |
