/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * 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 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 acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 AUTHOR 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. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ #include <openssl_grpc/asn1.h> #include <assert.h> #include <limits.h> #include <string.h> #include <openssl_grpc/asn1t.h> #include <openssl_grpc/mem.h> #include "../internal.h" #include "internal.h" static int asn1_item_ex_i2d_opt(ASN1_VALUE **pval, unsigned char **out, const ASN1_ITEM *it, int tag, int aclass, int optional); static int asn1_i2d_ex_primitive(ASN1_VALUE **pval, unsigned char **out, const ASN1_ITEM *it, int tag, int aclass, int optional); static int asn1_ex_i2c(ASN1_VALUE **pval, unsigned char *cont, int *out_omit, int *putype, const ASN1_ITEM *it); static int asn1_set_seq_out(STACK_OF(ASN1_VALUE) *sk, unsigned char **out, int skcontlen, const ASN1_ITEM *item, int do_sort); static int asn1_template_ex_i2d(ASN1_VALUE **pval, unsigned char **out, const ASN1_TEMPLATE *tt, int tag, int aclass); /* * Top level i2d equivalents */ int ASN1_item_i2d(ASN1_VALUE *val, unsigned char **out, const ASN1_ITEM *it) { if (out && !*out) { unsigned char *p, *buf; int len = ASN1_item_ex_i2d(&val, NULL, it, /*tag=*/-1, /*aclass=*/0); if (len <= 0) { return len; } buf = OPENSSL_malloc(len); if (!buf) { OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE); return -1; } p = buf; int len2 = ASN1_item_ex_i2d(&val, &p, it, /*tag=*/-1, /*aclass=*/0); if (len2 <= 0) { return len2; } assert(len == len2); *out = buf; return len; } return ASN1_item_ex_i2d(&val, out, it, /*tag=*/-1, /*aclass=*/0); } /* * 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) { int ret = asn1_item_ex_i2d_opt(pval, out, it, tag, aclass, /*optional=*/0); assert(ret != 0); return ret; } /* asn1_item_ex_i2d_opt behaves like |ASN1_item_ex_i2d| but, if |optional| is * non-zero and |*pval| is omitted, it returns zero and writes no bytes. */ int asn1_item_ex_i2d_opt(ASN1_VALUE **pval, unsigned char **out, const ASN1_ITEM *it, int tag, int aclass, int optional) { const ASN1_TEMPLATE *tt = NULL; int i, seqcontlen, seqlen; /* Historically, |aclass| was repurposed to pass additional flags into the * encoding process. */ assert((aclass & ASN1_TFLG_TAG_CLASS) == aclass); /* If not overridding the tag, |aclass| is ignored and should be zero. */ assert(tag != -1 || aclass == 0); /* All fields are pointers, except for boolean |ASN1_ITYPE_PRIMITIVE|s. * Optional primitives are handled later. */ if ((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval) { if (optional) { return 0; } OPENSSL_PUT_ERROR(ASN1, ASN1_R_MISSING_VALUE); return -1; } switch (it->itype) { case ASN1_ITYPE_PRIMITIVE: if (it->templates) { if (it->templates->flags & ASN1_TFLG_OPTIONAL) { OPENSSL_PUT_ERROR(ASN1, ASN1_R_BAD_TEMPLATE); return -1; } return asn1_template_ex_i2d(pval, out, it->templates, tag, aclass); } return asn1_i2d_ex_primitive(pval, out, it, tag, aclass, optional); case ASN1_ITYPE_MSTRING: /* * It never makes sense for multi-strings to have implicit tagging, so * if tag != -1, then this looks like an error in the template. */ if (tag != -1) { OPENSSL_PUT_ERROR(ASN1, ASN1_R_BAD_TEMPLATE); return -1; } return asn1_i2d_ex_primitive(pval, out, it, -1, 0, optional); case ASN1_ITYPE_CHOICE: { /* * It never makes sense for CHOICE types to have implicit tagging, so if * tag != -1, then this looks like an error in the template. */ if (tag != -1) { OPENSSL_PUT_ERROR(ASN1, ASN1_R_BAD_TEMPLATE); return -1; } i = asn1_get_choice_selector(pval, it); if (i < 0 || i >= it->tcount) { OPENSSL_PUT_ERROR(ASN1, ASN1_R_NO_MATCHING_CHOICE_TYPE); return -1; } const ASN1_TEMPLATE *chtt = it->templates + i; if (chtt->flags & ASN1_TFLG_OPTIONAL) { OPENSSL_PUT_ERROR(ASN1, ASN1_R_BAD_TEMPLATE); return -1; } ASN1_VALUE **pchval = asn1_get_field_ptr(pval, chtt); return asn1_template_ex_i2d(pchval, out, chtt, -1, 0); } case ASN1_ITYPE_EXTERN: { /* If new style i2d it does all the work */ const ASN1_EXTERN_FUNCS *ef = it->funcs; int ret = ef->asn1_ex_i2d(pval, out, it, tag, aclass); if (ret == 0) { /* |asn1_ex_i2d| should never return zero. We have already checked * for optional values generically, and |ASN1_ITYPE_EXTERN| fields * must be pointers. */ OPENSSL_PUT_ERROR(ASN1, ERR_R_INTERNAL_ERROR); return -1; } return ret; } case ASN1_ITYPE_SEQUENCE: { i = asn1_enc_restore(&seqcontlen, out, pval, it); /* An error occurred */ if (i < 0) return -1; /* 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; aclass = V_ASN1_UNIVERSAL; } /* First work out sequence content length */ for (i = 0, tt = it->templates; i < it->tcount; tt++, i++) { const ASN1_TEMPLATE *seqtt; ASN1_VALUE **pseqval; int tmplen; seqtt = asn1_do_adb(pval, tt, 1); if (!seqtt) return -1; pseqval = asn1_get_field_ptr(pval, seqtt); tmplen = asn1_template_ex_i2d(pseqval, NULL, seqtt, -1, 0); if (tmplen == -1 || (tmplen > INT_MAX - seqcontlen)) return -1; seqcontlen += tmplen; } seqlen = ASN1_object_size(/*constructed=*/1, seqcontlen, tag); if (!out || seqlen == -1) return seqlen; /* Output SEQUENCE header */ ASN1_put_object(out, /*constructed=*/1, 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 -1; pseqval = asn1_get_field_ptr(pval, seqtt); if (asn1_template_ex_i2d(pseqval, out, seqtt, -1, 0) < 0) { return -1; } } return seqlen; } default: OPENSSL_PUT_ERROR(ASN1, ASN1_R_BAD_TEMPLATE); return -1; } } /* asn1_template_ex_i2d behaves like |asn1_item_ex_i2d_opt| but uses an * |ASN1_TEMPLATE| instead of an |ASN1_ITEM|. An |ASN1_TEMPLATE| wraps an * |ASN1_ITEM| with modifiers such as tagging, SEQUENCE or SET, etc. Instead of * taking an |optional| parameter, it uses the |ASN1_TFLG_OPTIONAL| flag. */ 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; size_t j; flags = tt->flags; /* Historically, |iclass| was repurposed to pass additional flags into the * encoding process. */ assert((iclass & ASN1_TFLG_TAG_CLASS) == iclass); /* If not overridding the tag, |iclass| is ignored and should be zero. */ assert(tag != -1 || iclass == 0); /* * Work out tag and class to use: tagging may come either from the * template or the arguments, not both because this would create * ambiguity. */ if (flags & ASN1_TFLG_TAG_MASK) { /* Error if argument and template tagging */ if (tag != -1) { OPENSSL_PUT_ERROR(ASN1, ASN1_R_BAD_TEMPLATE); 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; } const int optional = (flags & ASN1_TFLG_OPTIONAL) != 0; /* * At this point 'ttag' contains the outer tag to use, and 'tclass' is the * class. */ 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) { if (optional) { return 0; } OPENSSL_PUT_ERROR(ASN1, ASN1_R_MISSING_VALUE); return -1; } if (flags & ASN1_TFLG_SET_OF) { isset = 1; /* Historically, types with both bits set were mutated when * serialized to apply the sort. We no longer support this. */ assert((flags & ASN1_TFLG_SEQUENCE_OF) == 0); } 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 (j = 0; j < sk_ASN1_VALUE_num(sk); j++) { int tmplen; skitem = sk_ASN1_VALUE_value(sk, j); tmplen = ASN1_item_ex_i2d(&skitem, NULL, ASN1_ITEM_ptr(tt->item), -1, 0); if (tmplen == -1 || (skcontlen > INT_MAX - tmplen)) return -1; skcontlen += tmplen; } sklen = ASN1_object_size(/*constructed=*/1, skcontlen, sktag); if (sklen == -1) return -1; /* If EXPLICIT need length of surrounding tag */ if (flags & ASN1_TFLG_EXPTAG) ret = ASN1_object_size(/*constructed=*/1, sklen, ttag); else ret = sklen; if (!out || ret == -1) return ret; /* Now encode this lot... */ /* EXPLICIT tag */ if (flags & ASN1_TFLG_EXPTAG) ASN1_put_object(out, /*constructed=*/1, sklen, ttag, tclass); /* SET or SEQUENCE and IMPLICIT tag */ ASN1_put_object(out, /*constructed=*/1, skcontlen, sktag, skaclass); /* And the stuff itself */ if (!asn1_set_seq_out(sk, out, skcontlen, ASN1_ITEM_ptr(tt->item), isset)) { return -1; } return ret; } if (flags & ASN1_TFLG_EXPTAG) { /* EXPLICIT tagging */ /* Find length of tagged item */ i = asn1_item_ex_i2d_opt(pval, NULL, ASN1_ITEM_ptr(tt->item), -1, 0, optional); if (i <= 0) return i; /* Find length of EXPLICIT tag */ ret = ASN1_object_size(/*constructed=*/1, i, ttag); if (out && ret != -1) { /* Output tag and item */ ASN1_put_object(out, /*constructed=*/1, i, ttag, tclass); if (ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item), -1, 0) < 0) { return -1; } } return ret; } /* Either normal or IMPLICIT tagging */ return asn1_item_ex_i2d_opt(pval, out, ASN1_ITEM_ptr(tt->item), ttag, tclass, optional); } /* Temporary structure used to hold DER encoding of items for SET OF */ typedef struct { unsigned char *data; int length; } 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 = OPENSSL_memcmp(d1->data, d2->data, cmplen); if (i) return i; return d1->length - d2->length; } /* asn1_set_seq_out writes |sk| to |out| under the i2d output convention, * excluding the tag and length. It returns one on success and zero on error. * |skcontlen| must be the total encoded size. If |do_sort| is non-zero, the * elements are sorted for a SET OF type. Each element of |sk| has type * |item|. */ static int asn1_set_seq_out(STACK_OF(ASN1_VALUE) *sk, unsigned char **out, int skcontlen, const ASN1_ITEM *item, int do_sort) { /* No need to sort if there are fewer than two items. */ if (!do_sort || sk_ASN1_VALUE_num(sk) < 2) { for (size_t i = 0; i < sk_ASN1_VALUE_num(sk); i++) { ASN1_VALUE *skitem = sk_ASN1_VALUE_value(sk, i); if (ASN1_item_ex_i2d(&skitem, out, item, -1, 0) < 0) { return 0; } } return 1; } if (sk_ASN1_VALUE_num(sk) > ((size_t)-1) / sizeof(DER_ENC)) { OPENSSL_PUT_ERROR(ASN1, ERR_R_OVERFLOW); return 0; } int ret = 0; unsigned char *const buf = OPENSSL_malloc(skcontlen); DER_ENC *encoded = OPENSSL_malloc(sk_ASN1_VALUE_num(sk) * sizeof(*encoded)); if (encoded == NULL || buf == NULL) { OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE); goto err; } /* Encode all the elements into |buf| and populate |encoded|. */ unsigned char *p = buf; for (size_t i = 0; i < sk_ASN1_VALUE_num(sk); i++) { ASN1_VALUE *skitem = sk_ASN1_VALUE_value(sk, i); encoded[i].data = p; encoded[i].length = ASN1_item_ex_i2d(&skitem, &p, item, -1, 0); if (encoded[i].length < 0) { goto err; } assert(p - buf <= skcontlen); } qsort(encoded, sk_ASN1_VALUE_num(sk), sizeof(*encoded), der_cmp); /* Output the elements in sorted order. */ p = *out; for (size_t i = 0; i < sk_ASN1_VALUE_num(sk); i++) { OPENSSL_memcpy(p, encoded[i].data, encoded[i].length); p += encoded[i].length; } *out = p; ret = 1; err: OPENSSL_free(encoded); OPENSSL_free(buf); return ret; } /* asn1_i2d_ex_primitive behaves like |ASN1_item_ex_i2d| but |item| must be a * a PRIMITIVE or MSTRING type that is not an |ASN1_ITEM_TEMPLATE|. */ static int asn1_i2d_ex_primitive(ASN1_VALUE **pval, unsigned char **out, const ASN1_ITEM *it, int tag, int aclass, int optional) { /* Get length of content octets and maybe find out the underlying type. */ int omit; int utype = it->utype; int len = asn1_ex_i2c(pval, NULL, &omit, &utype, it); if (len < 0) { return -1; } if (omit) { if (optional) { return 0; } OPENSSL_PUT_ERROR(ASN1, ASN1_R_MISSING_VALUE); return -1; } /* * 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. */ int usetag = utype != V_ASN1_SEQUENCE && utype != V_ASN1_SET && utype != V_ASN1_OTHER; /* 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, /*constructed=*/0, len, tag, aclass); } int len2 = asn1_ex_i2c(pval, *out, &omit, &utype, it); if (len2 < 0) { return -1; } assert(len == len2); assert(!omit); *out += len; } if (usetag) { return ASN1_object_size(/*constructed=*/0, len, tag); } return len; } /* asn1_ex_i2c writes the |*pval| to |cout| under the i2d output convention, * excluding the tag and length. It returns the number of bytes written, * possibly zero, on success or -1 on error. If |*pval| should be omitted, it * returns zero and sets |*out_omit| to true. * * If |it| is an MSTRING or ANY type, it gets the underlying type from |*pval|, * which must be an |ASN1_STRING| or |ASN1_TYPE|, respectively. It then updates * |*putype| with the tag number of type used, or |V_ASN1_OTHER| if it was not a * universal type. If |*putype| is set to |V_ASN1_SEQUENCE|, |V_ASN1_SET|, or * |V_ASN1_OTHER|, it additionally outputs the tag and length, so the caller * must not do so. * * Otherwise, |*putype| must contain |it->utype|. * * WARNING: Unlike most functions in this file, |asn1_ex_i2c| can return zero * without omitting the element. ASN.1 values may have empty contents. */ static int asn1_ex_i2c(ASN1_VALUE **pval, unsigned char *cout, int *out_omit, int *putype, const ASN1_ITEM *it) { ASN1_BOOLEAN *tbool = NULL; ASN1_STRING *strtmp; ASN1_OBJECT *otmp; int utype; const unsigned char *cont; unsigned char c; int len; /* Historically, |it->funcs| for primitive types contained an * |ASN1_PRIMITIVE_FUNCS| table of callbacks. */ assert(it->funcs == NULL); *out_omit = 0; /* Should type be omitted? */ if ((it->itype != ASN1_ITYPE_PRIMITIVE) || (it->utype != V_ASN1_BOOLEAN)) { if (!*pval) { *out_omit = 1; return 0; } } if (it->itype == ASN1_ITYPE_MSTRING) { /* If MSTRING type set the underlying type */ strtmp = (ASN1_STRING *)*pval; utype = strtmp->type; if (utype < 0 && utype != V_ASN1_OTHER) { /* MSTRINGs can have type -1 when default-constructed. */ OPENSSL_PUT_ERROR(ASN1, ASN1_R_WRONG_TYPE); return -1; } /* Negative INTEGER and ENUMERATED values use |ASN1_STRING| type values * that do not match their corresponding utype values. INTEGERs cannot * participate in MSTRING types, but ENUMERATEDs can. * * TODO(davidben): Is this a bug? Although arguably one of the MSTRING * types should contain more values, rather than less. See * https://crbug.com/boringssl/412. But it is not possible to fit all * possible ANY values into an |ASN1_STRING|, so matching the spec here * is somewhat hopeless. */ if (utype == V_ASN1_NEG_INTEGER) { utype = V_ASN1_INTEGER; } else if (utype == V_ASN1_NEG_ENUMERATED) { utype = V_ASN1_ENUMERATED; } *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; if (utype < 0 && utype != V_ASN1_OTHER) { /* |ASN1_TYPE|s can have type -1 when default-constructed. */ OPENSSL_PUT_ERROR(ASN1, ASN1_R_WRONG_TYPE); return -1; } *putype = utype; pval = &typ->value.asn1_value; } else utype = *putype; switch (utype) { case V_ASN1_OBJECT: otmp = (ASN1_OBJECT *)*pval; cont = otmp->data; len = otmp->length; if (len == 0) { /* Some |ASN1_OBJECT|s do not have OIDs and cannot be serialized. */ OPENSSL_PUT_ERROR(ASN1, ASN1_R_ILLEGAL_OBJECT); return -1; } break; case V_ASN1_NULL: cont = NULL; len = 0; break; case V_ASN1_BOOLEAN: tbool = (ASN1_BOOLEAN *)pval; if (*tbool == -1) { *out_omit = 1; return 0; } if (it->utype != V_ASN1_ANY) { /* * Default handling if value == size field then omit */ if ((*tbool && (it->size > 0)) || (!*tbool && !it->size)) { *out_omit = 1; return 0; } } c = *tbool ? 0xff : 0x00; cont = &c; len = 1; break; case V_ASN1_BIT_STRING: { int ret = i2c_ASN1_BIT_STRING((ASN1_BIT_STRING *)*pval, cout ? &cout : NULL); /* |i2c_ASN1_BIT_STRING| returns zero on error instead of -1. */ return ret <= 0 ? -1 : ret; } case V_ASN1_INTEGER: case V_ASN1_ENUMERATED: { /* |i2c_ASN1_INTEGER| also handles ENUMERATED. */ int ret = i2c_ASN1_INTEGER((ASN1_INTEGER *)*pval, cout ? &cout : NULL); /* |i2c_ASN1_INTEGER| returns zero on error instead of -1. */ return ret <= 0 ? -1 : ret; } 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; cont = strtmp->data; len = strtmp->length; break; } if (cout && len) OPENSSL_memcpy(cout, cont, len); return len; }