/** Decode a SEQUENCE @param in The DER encoded input @param inlen The size of the input @param list The list of items to decode @param outlen The number of items in the list @param ordered Search an unordeded or ordered list @return CRYPT_OK on success */ int der_decode_sequence_ex(const unsigned char *in, unsigned long inlen, ltc_asn1_list *list, unsigned long outlen, int ordered) { int err, type; unsigned long size, x, y, z, i, blksize; void *data; LTC_ARGCHK(in != NULL); LTC_ARGCHK(list != NULL); /* get blk size */ if (inlen < 2) { return CRYPT_INVALID_PACKET; } /* sequence type? We allow 0x30 SEQUENCE and 0x31 SET since fundamentally they're the same structure */ x = 0; if (in[x] != 0x30 && in[x] != 0x31) { return CRYPT_INVALID_PACKET; } ++x; if (in[x] < 128) { blksize = in[x++]; } else if (in[x] & 0x80) { if (in[x] < 0x81 || in[x] > 0x83) { return CRYPT_INVALID_PACKET; } y = in[x++] & 0x7F; /* would reading the len bytes overrun? */ if (x + y > inlen) { return CRYPT_INVALID_PACKET; } /* read len */ blksize = 0; while (y--) { blksize = (blksize << 8) | (unsigned long)in[x++]; } } /* would this blksize overflow? */ if (x + blksize > inlen) { return CRYPT_INVALID_PACKET; } /* mark all as unused */ for (i = 0; i < outlen; i++) { list[i].used = 0; } /* ok read data */ inlen = blksize; for (i = 0; i < outlen; i++) { z = 0; type = list[i].type; size = list[i].size; data = list[i].data; if (!ordered && list[i].used == 1) { continue; } if (type == LTC_ASN1_EOL) { break; } switch (type) { case LTC_ASN1_BOOLEAN: z = inlen; if ((err = der_decode_boolean(in + x, z, ((int *)data))) != CRYPT_OK) { goto LBL_ERR; } if ((err = der_length_boolean(&z)) != CRYPT_OK) { goto LBL_ERR; } break; case LTC_ASN1_INTEGER: z = inlen; if ((err = der_decode_integer(in + x, z, data)) != CRYPT_OK) { if (!ordered) { continue; } goto LBL_ERR; } if ((err = der_length_integer(data, &z)) != CRYPT_OK) { goto LBL_ERR; } break; case LTC_ASN1_SHORT_INTEGER: z = inlen; if ((err = der_decode_short_integer(in + x, z, data)) != CRYPT_OK) { if (!ordered) { continue; } goto LBL_ERR; } if ((err = der_length_short_integer(((unsigned long*)data)[0], &z)) != CRYPT_OK) { goto LBL_ERR; } break; case LTC_ASN1_BIT_STRING: z = inlen; if ((err = der_decode_bit_string(in + x, z, data, &size)) != CRYPT_OK) { if (!ordered) { continue; } goto LBL_ERR; } list[i].size = size; if ((err = der_length_bit_string(size, &z)) != CRYPT_OK) { goto LBL_ERR; } break; case LTC_ASN1_OCTET_STRING: z = inlen; if ((err = der_decode_octet_string(in + x, z, data, &size)) != CRYPT_OK) { if (!ordered) { continue; } goto LBL_ERR; } list[i].size = size; if ((err = der_length_octet_string(size, &z)) != CRYPT_OK) { goto LBL_ERR; } break; case LTC_ASN1_NULL: if (inlen < 2 || in[x] != 0x05 || in[x+1] != 0x00) { if (!ordered) { continue; } err = CRYPT_INVALID_PACKET; goto LBL_ERR; } z = 2; break; case LTC_ASN1_OBJECT_IDENTIFIER: z = inlen; if ((err = der_decode_object_identifier(in + x, z, data, &size)) != CRYPT_OK) { if (!ordered) { continue; } goto LBL_ERR; } list[i].size = size; if ((err = der_length_object_identifier(data, size, &z)) != CRYPT_OK) { goto LBL_ERR; } break; case LTC_ASN1_IA5_STRING: z = inlen; if ((err = der_decode_ia5_string(in + x, z, data, &size)) != CRYPT_OK) { if (!ordered) { continue; } goto LBL_ERR; } list[i].size = size; if ((err = der_length_ia5_string(data, size, &z)) != CRYPT_OK) { goto LBL_ERR; } break; case LTC_ASN1_PRINTABLE_STRING: z = inlen; if ((err = der_decode_printable_string(in + x, z, data, &size)) != CRYPT_OK) { if (!ordered) { continue; } goto LBL_ERR; } list[i].size = size; if ((err = der_length_printable_string(data, size, &z)) != CRYPT_OK) { goto LBL_ERR; } break; case LTC_ASN1_UTCTIME: z = inlen; if ((err = der_decode_utctime(in + x, &z, data)) != CRYPT_OK) { if (!ordered) { continue; } goto LBL_ERR; } break; case LTC_ASN1_SET: z = inlen; if ((err = der_decode_set(in + x, z, data, size)) != CRYPT_OK) { if (!ordered) { continue; } goto LBL_ERR; } if ((err = der_length_sequence(data, size, &z)) != CRYPT_OK) { goto LBL_ERR; } break; case LTC_ASN1_SETOF: case LTC_ASN1_SEQUENCE: /* detect if we have the right type */ if ((type == LTC_ASN1_SETOF && (in[x] & 0x3F) != 0x31) || (type == LTC_ASN1_SEQUENCE && (in[x] & 0x3F) != 0x30)) { err = CRYPT_INVALID_PACKET; goto LBL_ERR; } z = inlen; if ((err = der_decode_sequence(in + x, z, data, size)) != CRYPT_OK) { if (!ordered) { continue; } goto LBL_ERR; } if ((err = der_length_sequence(data, size, &z)) != CRYPT_OK) { goto LBL_ERR; } break; case LTC_ASN1_CHOICE: z = inlen; if ((err = der_decode_choice(in + x, &z, data, size)) != CRYPT_OK) { if (!ordered) { continue; } goto LBL_ERR; } break; default: err = CRYPT_INVALID_ARG; goto LBL_ERR; } x += z; inlen -= z; list[i].used = 1; if (!ordered) { /* restart the decoder */ i = -1; } } for (i = 0; i < outlen; i++) { if (list[i].used == 0) { err = CRYPT_INVALID_PACKET; goto LBL_ERR; } } err = CRYPT_OK; LBL_ERR: return err; }
/** ASN.1 DER Flexi(ble) decoder will decode arbitrary DER packets and create a linked list of the decoded elements. @param in The input buffer @param inlen [in/out] The length of the input buffer and on output the amount of decoded data @param out [out] A pointer to the linked list @return CRYPT_OK on success. */ int der_decode_sequence_flexi(const unsigned char *in, unsigned long *inlen, ltc_asn1_list **out) { ltc_asn1_list *l; unsigned long err, type, len, totlen, x, y; void *realloc_tmp; LTC_ARGCHK(in != NULL); LTC_ARGCHK(inlen != NULL); LTC_ARGCHK(out != NULL); l = NULL; totlen = 0; /* scan the input and and get lengths and what not */ while (*inlen) { /* read the type byte */ type = *in; /* fetch length */ len = fetch_length(in, *inlen); if (len > *inlen) { err = CRYPT_INVALID_PACKET; goto error; } /* alloc new link */ if (l == NULL) { l = XCALLOC(1, sizeof(*l)); if (l == NULL) { err = CRYPT_MEM; goto error; } } else { l->next = XCALLOC(1, sizeof(*l)); if (l->next == NULL) { err = CRYPT_MEM; goto error; } l->next->prev = l; l = l->next; } /* now switch on type */ switch (type) { case 0x01: /* BOOLEAN */ l->type = LTC_ASN1_BOOLEAN; l->size = 1; l->data = XCALLOC(1, sizeof(int)); if ((err = der_decode_boolean(in, *inlen, l->data)) != CRYPT_OK) { goto error; } if ((err = der_length_boolean(&len)) != CRYPT_OK) { goto error; } break; case 0x02: /* INTEGER */ /* init field */ l->type = LTC_ASN1_INTEGER; l->size = 1; if ((err = mp_init(&l->data)) != CRYPT_OK) { goto error; } /* decode field */ if ((err = der_decode_integer(in, *inlen, l->data)) != CRYPT_OK) { goto error; } /* calc length of object */ if ((err = der_length_integer(l->data, &len)) != CRYPT_OK) { goto error; } break; case 0x03: /* BIT */ /* init field */ l->type = LTC_ASN1_BIT_STRING; l->size = len * 8; /* *8 because we store decoded bits one per char and they are encoded 8 per char. */ if ((l->data = XCALLOC(1, l->size)) == NULL) { err = CRYPT_MEM; goto error; } if ((err = der_decode_bit_string(in, *inlen, l->data, &l->size)) != CRYPT_OK) { goto error; } if ((err = der_length_bit_string(l->size, &len)) != CRYPT_OK) { goto error; } break; case 0x04: /* OCTET */ /* init field */ l->type = LTC_ASN1_OCTET_STRING; l->size = len; if ((l->data = XCALLOC(1, l->size)) == NULL) { err = CRYPT_MEM; goto error; } if ((err = der_decode_octet_string(in, *inlen, l->data, &l->size)) != CRYPT_OK) { goto error; } if ((err = der_length_octet_string(l->size, &len)) != CRYPT_OK) { goto error; } break; case 0x05: /* NULL */ /* valid NULL is 0x05 0x00 */ if (in[0] != 0x05 || in[1] != 0x00) { err = CRYPT_INVALID_PACKET; goto error; } /* simple to store ;-) */ l->type = LTC_ASN1_NULL; l->data = NULL; l->size = 0; len = 2; break; case 0x06: /* OID */ /* init field */ l->type = LTC_ASN1_OBJECT_IDENTIFIER; l->size = len; if ((l->data = XCALLOC(len, sizeof(unsigned long))) == NULL) { err = CRYPT_MEM; goto error; } if ((err = der_decode_object_identifier(in, *inlen, l->data, &l->size)) != CRYPT_OK) { goto error; } if ((err = der_length_object_identifier(l->data, l->size, &len)) != CRYPT_OK) { goto error; } /* resize it to save a bunch of mem */ if ((realloc_tmp = XREALLOC(l->data, l->size * sizeof(unsigned long))) == NULL) { /* out of heap but this is not an error */ break; } l->data = realloc_tmp; break; case 0x0C: /* UTF8 */ /* init field */ l->type = LTC_ASN1_UTF8_STRING; l->size = len; if ((l->data = XCALLOC(sizeof(wchar_t), l->size)) == NULL) { err = CRYPT_MEM; goto error; } if ((err = der_decode_utf8_string(in, *inlen, l->data, &l->size)) != CRYPT_OK) { goto error; } if ((err = der_length_utf8_string(l->data, l->size, &len)) != CRYPT_OK) { goto error; } break; case 0x13: /* PRINTABLE */ /* init field */ l->type = LTC_ASN1_PRINTABLE_STRING; l->size = len; if ((l->data = XCALLOC(1, l->size)) == NULL) { err = CRYPT_MEM; goto error; } if ((err = der_decode_printable_string(in, *inlen, l->data, &l->size)) != CRYPT_OK) { goto error; } if ((err = der_length_printable_string(l->data, l->size, &len)) != CRYPT_OK) { goto error; } break; case 0x16: /* IA5 */ /* init field */ l->type = LTC_ASN1_IA5_STRING; l->size = len; if ((l->data = XCALLOC(1, l->size)) == NULL) { err = CRYPT_MEM; goto error; } if ((err = der_decode_ia5_string(in, *inlen, l->data, &l->size)) != CRYPT_OK) { goto error; } if ((err = der_length_ia5_string(l->data, l->size, &len)) != CRYPT_OK) { goto error; } break; case 0x17: /* UTC TIME */ /* init field */ l->type = LTC_ASN1_UTCTIME; l->size = 1; if ((l->data = XCALLOC(1, sizeof(ltc_utctime))) == NULL) { err = CRYPT_MEM; goto error; } len = *inlen; if ((err = der_decode_utctime(in, &len, l->data)) != CRYPT_OK) { goto error; } if ((err = der_length_utctime(l->data, &len)) != CRYPT_OK) { goto error; } break; case 0x30: /* SEQUENCE */ case 0x31: /* SET */ /* init field */ l->type = (type == 0x30) ? LTC_ASN1_SEQUENCE : LTC_ASN1_SET; /* we have to decode the SEQUENCE header and get it's length */ /* move past type */ ++in; --(*inlen); /* read length byte */ x = *in++; --(*inlen); /* smallest SEQUENCE/SET header */ y = 2; /* now if it's > 127 the next bytes are the length of the length */ if (x > 128) { x &= 0x7F; in += x; *inlen -= x; /* update sequence header len */ y += x; } /* Sequence elements go as child */ len = len - y; if ((err = der_decode_sequence_flexi(in, &len, &(l->child))) != CRYPT_OK) { goto error; } /* len update */ totlen += y; /* link them up y0 */ l->child->parent = l; break; default: /* invalid byte ... this is a soft error */ /* remove link */ l = l->prev; XFREE(l->next); l->next = NULL; goto outside; } /* advance pointers */ totlen += len; in += len; *inlen -= len; } outside: /* rewind l please */ while (l->prev != NULL || l->parent != NULL) { if (l->parent != NULL) { l = l->parent; } else { l = l->prev; } } /* return */ *out = l; *inlen = totlen; return CRYPT_OK; error: /* free list */ der_sequence_free(l); return err; }
/** Get the length of a DER sequence @param list The sequences of items in the SEQUENCE @param inlen The number of items @param outlen [out] The length required in octets to store it @return CRYPT_OK on success */ int der_length_sequence(ltc_asn1_list *list, unsigned long inlen, unsigned long *outlen) { int err, type; unsigned long size, x, y, z, i; void *data; LTC_ARGCHK(list != NULL); LTC_ARGCHK(outlen != NULL); /* get size of output that will be required */ y = 0; for (i = 0; i < inlen; i++) { type = list[i].type; size = list[i].size; data = list[i].data; if (type == LTC_ASN1_EOL) { break; } switch (type) { case LTC_ASN1_BOOLEAN: if ((err = der_length_boolean(&x)) != CRYPT_OK) { goto LBL_ERR; } y += x; break; case LTC_ASN1_INTEGER: if ((err = der_length_integer(data, &x)) != CRYPT_OK) { goto LBL_ERR; } y += x; break; case LTC_ASN1_SHORT_INTEGER: if ((err = der_length_short_integer(*((unsigned long *)data), &x)) != CRYPT_OK) { goto LBL_ERR; } y += x; break; case LTC_ASN1_BIT_STRING: if ((err = der_length_bit_string(size, &x)) != CRYPT_OK) { goto LBL_ERR; } y += x; break; case LTC_ASN1_OCTET_STRING: if ((err = der_length_octet_string(size, &x)) != CRYPT_OK) { goto LBL_ERR; } y += x; break; case LTC_ASN1_NULL: y += 2; break; case LTC_ASN1_OBJECT_IDENTIFIER: if ((err = der_length_object_identifier(data, size, &x)) != CRYPT_OK) { goto LBL_ERR; } y += x; break; case LTC_ASN1_IA5_STRING: if ((err = der_length_ia5_string(data, size, &x)) != CRYPT_OK) { goto LBL_ERR; } y += x; break; case LTC_ASN1_PRINTABLE_STRING: if ((err = der_length_printable_string(data, size, &x)) != CRYPT_OK) { goto LBL_ERR; } y += x; break; case LTC_ASN1_UTCTIME: if ((err = der_length_utctime(data, &x)) != CRYPT_OK) { goto LBL_ERR; } y += x; break; case LTC_ASN1_SET: case LTC_ASN1_SETOF: case LTC_ASN1_SEQUENCE: if ((err = der_length_sequence(data, size, &x)) != CRYPT_OK) { goto LBL_ERR; } y += x; break; default: err = CRYPT_INVALID_ARG; goto LBL_ERR; } } /* calc header size */ z = y; if (y < 128) { y += 2; } else if (y < 256) { /* 0x30 0x81 LL */ y += 3; } else if (y < 65536UL) { /* 0x30 0x82 LL LL */ y += 4; } else if (y < 16777216UL) { /* 0x30 0x83 LL LL LL */ y += 5; } else { err = CRYPT_INVALID_ARG; goto LBL_ERR; } /* store size */ *outlen = y; err = CRYPT_OK; LBL_ERR: return err; }
/** ASN.1 DER Flexi(ble) decoder will decode arbitrary DER packets and create a linked list of the decoded elements. @param in The input buffer @param inlen [in/out] The length of the input buffer and on output the amount of decoded data @param out [out] A pointer to the linked list @return CRYPT_OK on success. */ int der_decode_sequence_flexi(const unsigned char *in, unsigned long *inlen, ltc_asn1_list **out) { ltc_asn1_list *l; unsigned long err, type, len, totlen, data_offset; void *realloc_tmp; LTC_ARGCHK(in != NULL); LTC_ARGCHK(inlen != NULL); LTC_ARGCHK(out != NULL); l = NULL; totlen = 0; if (*inlen == 0) { /* alloc new link */ if ((err = _new_element(&l)) != CRYPT_OK) { goto error; } } /* scan the input and and get lengths and what not */ while (*inlen) { /* read the type byte */ type = *in; /* fetch length */ len = _fetch_length(in, *inlen, &data_offset); if (len > *inlen) { err = CRYPT_INVALID_PACKET; goto error; } /* alloc new link */ if ((err = _new_element(&l)) != CRYPT_OK) { goto error; } if ((type & 0x20) && (type != 0x30) && (type != 0x31)) { /* constructed, use the 'used' field to store the original identifier */ l->used = type; /* treat constructed elements like SETs */ type = 0x20; } else if ((type & 0xC0) == 0x80) { /* context-specific, use the 'used' field to store the original identifier */ l->used = type; /* context-specific elements are treated as opaque data */ type = 0x80; } /* now switch on type */ switch (type) { case 0x01: /* BOOLEAN */ l->type = LTC_ASN1_BOOLEAN; l->size = 1; l->data = XCALLOC(1, sizeof(int)); if ((err = der_decode_boolean(in, *inlen, l->data)) != CRYPT_OK) { goto error; } if ((err = der_length_boolean(&len)) != CRYPT_OK) { goto error; } break; case 0x02: /* INTEGER */ /* init field */ l->type = LTC_ASN1_INTEGER; l->size = 1; if ((err = mp_init(&l->data)) != CRYPT_OK) { goto error; } /* decode field */ if ((err = der_decode_integer(in, *inlen, l->data)) != CRYPT_OK) { goto error; } /* calc length of object */ if ((err = der_length_integer(l->data, &len)) != CRYPT_OK) { goto error; } break; case 0x03: /* BIT */ /* init field */ l->type = LTC_ASN1_BIT_STRING; l->size = len * 8; /* *8 because we store decoded bits one per char and they are encoded 8 per char. */ if ((l->data = XCALLOC(1, l->size)) == NULL) { err = CRYPT_MEM; goto error; } if ((err = der_decode_bit_string(in, *inlen, l->data, &l->size)) != CRYPT_OK) { goto error; } if ((err = der_length_bit_string(l->size, &len)) != CRYPT_OK) { goto error; } break; case 0x04: /* OCTET */ /* init field */ l->type = LTC_ASN1_OCTET_STRING; l->size = len; if ((l->data = XCALLOC(1, l->size)) == NULL) { err = CRYPT_MEM; goto error; } if ((err = der_decode_octet_string(in, *inlen, l->data, &l->size)) != CRYPT_OK) { goto error; } if ((err = der_length_octet_string(l->size, &len)) != CRYPT_OK) { goto error; } break; case 0x05: /* NULL */ /* valid NULL is 0x05 0x00 */ if (in[0] != 0x05 || in[1] != 0x00) { err = CRYPT_INVALID_PACKET; goto error; } /* simple to store ;-) */ l->type = LTC_ASN1_NULL; l->data = NULL; l->size = 0; len = 2; break; case 0x06: /* OID */ /* init field */ l->type = LTC_ASN1_OBJECT_IDENTIFIER; l->size = len; if ((l->data = XCALLOC(len, sizeof(unsigned long))) == NULL) { err = CRYPT_MEM; goto error; } if ((err = der_decode_object_identifier(in, *inlen, l->data, &l->size)) != CRYPT_OK) { goto error; } if ((err = der_length_object_identifier(l->data, l->size, &len)) != CRYPT_OK) { goto error; } /* resize it to save a bunch of mem */ if ((realloc_tmp = XREALLOC(l->data, l->size * sizeof(unsigned long))) == NULL) { /* out of heap but this is not an error */ break; } l->data = realloc_tmp; break; case 0x0C: /* UTF8 */ /* init field */ l->type = LTC_ASN1_UTF8_STRING; l->size = len; if ((l->data = XCALLOC(sizeof(wchar_t), l->size)) == NULL) { err = CRYPT_MEM; goto error; } if ((err = der_decode_utf8_string(in, *inlen, l->data, &l->size)) != CRYPT_OK) { goto error; } if ((err = der_length_utf8_string(l->data, l->size, &len)) != CRYPT_OK) { goto error; } break; case 0x13: /* PRINTABLE */ /* init field */ l->type = LTC_ASN1_PRINTABLE_STRING; l->size = len; if ((l->data = XCALLOC(1, l->size)) == NULL) { err = CRYPT_MEM; goto error; } if ((err = der_decode_printable_string(in, *inlen, l->data, &l->size)) != CRYPT_OK) { goto error; } if ((err = der_length_printable_string(l->data, l->size, &len)) != CRYPT_OK) { goto error; } break; case 0x14: /* TELETEXT */ /* init field */ l->type = LTC_ASN1_TELETEX_STRING; l->size = len; if ((l->data = XCALLOC(1, l->size)) == NULL) { err = CRYPT_MEM; goto error; } if ((err = der_decode_teletex_string(in, *inlen, l->data, &l->size)) != CRYPT_OK) { goto error; } if ((err = der_length_teletex_string(l->data, l->size, &len)) != CRYPT_OK) { goto error; } break; case 0x16: /* IA5 */ /* init field */ l->type = LTC_ASN1_IA5_STRING; l->size = len; if ((l->data = XCALLOC(1, l->size)) == NULL) { err = CRYPT_MEM; goto error; } if ((err = der_decode_ia5_string(in, *inlen, l->data, &l->size)) != CRYPT_OK) { goto error; } if ((err = der_length_ia5_string(l->data, l->size, &len)) != CRYPT_OK) { goto error; } break; case 0x17: /* UTC TIME */ /* init field */ l->type = LTC_ASN1_UTCTIME; l->size = 1; if ((l->data = XCALLOC(1, sizeof(ltc_utctime))) == NULL) { err = CRYPT_MEM; goto error; } len = *inlen; if ((err = der_decode_utctime(in, &len, l->data)) != CRYPT_OK) { goto error; } if ((err = der_length_utctime(l->data, &len)) != CRYPT_OK) { goto error; } break; case 0x18: l->type = LTC_ASN1_GENERALIZEDTIME; l->size = len; if ((l->data = XCALLOC(1, sizeof(ltc_generalizedtime))) == NULL) { err = CRYPT_MEM; goto error; } if ((err = der_decode_generalizedtime(in, &len, l->data)) != CRYPT_OK) { goto error; } if ((err = der_length_generalizedtime(l->data, &len)) != CRYPT_OK) { goto error; } break; case 0x20: /* Any CONSTRUCTED element that is neither SEQUENCE nor SET */ case 0x30: /* SEQUENCE */ case 0x31: /* SET */ /* init field */ if (type == 0x20) { l->type = LTC_ASN1_CONSTRUCTED; } else if (type == 0x30) { l->type = LTC_ASN1_SEQUENCE; } else { l->type = LTC_ASN1_SET; } if ((l->data = XMALLOC(len)) == NULL) { err = CRYPT_MEM; goto error; } XMEMCPY(l->data, in, len); l->size = len; /* jump to the start of the data */ in += data_offset; *inlen -= data_offset; len = len - data_offset; /* Sequence elements go as child */ if ((err = der_decode_sequence_flexi(in, &len, &(l->child))) != CRYPT_OK) { goto error; } /* len update */ totlen += data_offset; /* the flexi decoder can also do nothing, so make sure a child has been allocated */ if (l->child) { /* link them up y0 */ l->child->parent = l; } break; case 0x80: /* Context-specific */ l->type = LTC_ASN1_CONTEXT_SPECIFIC; if ((l->data = XCALLOC(1, len - data_offset)) == NULL) { err = CRYPT_MEM; goto error; } XMEMCPY(l->data, in + data_offset, len - data_offset); l->size = len - data_offset; break; default: /* invalid byte ... this is a soft error */ /* remove link */ if (l->prev) { l = l->prev; XFREE(l->next); l->next = NULL; } goto outside; } /* advance pointers */ totlen += len; in += len; *inlen -= len; } outside: /* in case we processed anything */ if (totlen) { /* rewind l please */ while (l->prev != NULL || l->parent != NULL) { if (l->parent != NULL) { l = l->parent; } else { l = l->prev; } } } /* return */ *out = l; *inlen = totlen; return CRYPT_OK; error: /* free list */ der_sequence_free(l); return err; }
/** Decode a CHOICE @param in The DER encoded input @param inlen [in/out] The size of the input and resulting size of read type @param list The list of items to decode @param outlen The number of items in the list @return CRYPT_OK on success */ int der_decode_choice(const unsigned char *in, unsigned long *inlen, ltc_asn1_list *list, unsigned long outlen) { unsigned long size, x, z; void *data; LTC_ARGCHK(in != NULL); LTC_ARGCHK(inlen != NULL); LTC_ARGCHK(list != NULL); /* get blk size */ if (*inlen < 2) { return CRYPT_INVALID_PACKET; } /* set all of the "used" flags to zero */ for (x = 0; x < outlen; x++) { list[x].used = 0; } /* now scan until we have a winner */ for (x = 0; x < outlen; x++) { size = list[x].size; data = list[x].data; switch (list[x].type) { case LTC_ASN1_INTEGER: if (der_decode_integer(in, *inlen, data) == CRYPT_OK) { if (der_length_integer(data, &z) == CRYPT_OK) { list[x].used = 1; *inlen = z; return CRYPT_OK; } } break; case LTC_ASN1_SHORT_INTEGER: if (der_decode_short_integer(in, *inlen, data) == CRYPT_OK) { if (der_length_short_integer(size, &z) == CRYPT_OK) { list[x].used = 1; *inlen = z; return CRYPT_OK; } } break; case LTC_ASN1_BIT_STRING: if (der_decode_bit_string(in, *inlen, data, &size) == CRYPT_OK) { if (der_length_bit_string(size, &z) == CRYPT_OK) { list[x].used = 1; list[x].size = size; *inlen = z; return CRYPT_OK; } } break; case LTC_ASN1_OCTET_STRING: if (der_decode_octet_string(in, *inlen, data, &size) == CRYPT_OK) { if (der_length_octet_string(size, &z) == CRYPT_OK) { list[x].used = 1; list[x].size = size; *inlen = z; return CRYPT_OK; } } break; case LTC_ASN1_NULL: if (*inlen == 2 && in[x] == 0x05 && in[x+1] == 0x00) { *inlen = 2; list[x].used = 1; return CRYPT_OK; } break; case LTC_ASN1_OBJECT_IDENTIFIER: if (der_decode_object_identifier(in, *inlen, data, &size) == CRYPT_OK) { if (der_length_object_identifier(data, size, &z) == CRYPT_OK) { list[x].used = 1; list[x].size = size; *inlen = z; return CRYPT_OK; } } break; case LTC_ASN1_IA5_STRING: if (der_decode_ia5_string(in, *inlen, data, &size) == CRYPT_OK) { if (der_length_ia5_string(data, size, &z) == CRYPT_OK) { list[x].used = 1; list[x].size = size; *inlen = z; return CRYPT_OK; } } break; case LTC_ASN1_PRINTABLE_STRING: if (der_decode_printable_string(in, *inlen, data, &size) == CRYPT_OK) { if (der_length_printable_string(data, size, &z) == CRYPT_OK) { list[x].used = 1; list[x].size = size; *inlen = z; return CRYPT_OK; } } break; case LTC_ASN1_UTF8_STRING: if (der_decode_utf8_string(in, *inlen, data, &size) == CRYPT_OK) { if (der_length_utf8_string(data, size, &z) == CRYPT_OK) { list[x].used = 1; list[x].size = size; *inlen = z; return CRYPT_OK; } } break; case LTC_ASN1_UTCTIME: z = *inlen; if (der_decode_utctime(in, &z, data) == CRYPT_OK) { list[x].used = 1; *inlen = z; return CRYPT_OK; } break; case LTC_ASN1_SET: case LTC_ASN1_SETOF: case LTC_ASN1_SEQUENCE: if (der_decode_sequence(in, *inlen, data, size) == CRYPT_OK) { if (der_length_sequence(data, size, &z) == CRYPT_OK) { list[x].used = 1; *inlen = z; return CRYPT_OK; } } break; default: return CRYPT_INVALID_ARG; } } return CRYPT_INVALID_PACKET; }