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-rw-r--r--security/nss/lib/util/secasn1e.c1572
1 files changed, 1572 insertions, 0 deletions
diff --git a/security/nss/lib/util/secasn1e.c b/security/nss/lib/util/secasn1e.c
new file mode 100644
index 0000000000..41d2848971
--- /dev/null
+++ b/security/nss/lib/util/secasn1e.c
@@ -0,0 +1,1572 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * Support for ENcoding ASN.1 data based on BER/DER (Basic/Distinguished
+ * Encoding Rules).
+ */
+
+#include "secasn1.h"
+
+typedef enum {
+ beforeHeader,
+ duringContents,
+ duringGroup,
+ duringSequence,
+ afterContents,
+ afterImplicit,
+ afterInline,
+ afterPointer,
+ afterChoice,
+ notInUse
+} sec_asn1e_parse_place;
+
+typedef enum {
+ allDone,
+ encodeError,
+ keepGoing,
+ needBytes
+} sec_asn1e_parse_status;
+
+typedef enum {
+ hdr_normal = 0, /* encode header normally */
+ hdr_any = 1, /* header already encoded in content */
+ hdr_decoder = 2, /* template only used by decoder. skip it. */
+ hdr_optional = 3, /* optional component, to be omitted */
+ hdr_placeholder = 4 /* place holder for from_buf content */
+} sec_asn1e_hdr_encoding;
+
+typedef struct sec_asn1e_state_struct {
+ SEC_ASN1EncoderContext *top;
+ const SEC_ASN1Template *theTemplate;
+ void *src;
+
+ struct sec_asn1e_state_struct *parent; /* aka prev */
+ struct sec_asn1e_state_struct *child; /* aka next */
+
+ sec_asn1e_parse_place place; /* where we are in encoding process */
+
+ /*
+ * XXX explain the next fields as clearly as possible...
+ */
+ unsigned char tag_modifiers;
+ unsigned char tag_number;
+ unsigned long underlying_kind;
+
+ int depth;
+
+ PRBool isExplicit, /* we are handling an isExplicit header */
+ indefinite, /* need end-of-contents */
+ is_string, /* encoding a simple string or an ANY */
+ may_stream, /* when streaming, do indefinite encoding */
+ optional, /* omit field if it has no contents */
+ disallowStreaming; /* disallow streaming in all sub-templates */
+} sec_asn1e_state;
+
+/*
+ * An "outsider" will have an opaque pointer to this, created by calling
+ * SEC_ASN1EncoderStart(). It will be passed back in to all subsequent
+ * calls to SEC_ASN1EncoderUpdate() and related routines, and when done
+ * it is passed to SEC_ASN1EncoderFinish().
+ */
+struct sec_EncoderContext_struct {
+ PLArenaPool *our_pool; /* for our internal allocs */
+
+ sec_asn1e_state *current;
+ sec_asn1e_parse_status status;
+
+ PRBool streaming;
+ PRBool from_buf;
+
+ SEC_ASN1NotifyProc notify_proc; /* call before/after handling field */
+ void *notify_arg; /* argument to notify_proc */
+ PRBool during_notify; /* true during call to notify_proc */
+
+ SEC_ASN1WriteProc output_proc; /* pass encoded bytes to this */
+ void *output_arg; /* argument to that function */
+};
+
+static sec_asn1e_state *
+sec_asn1e_push_state(SEC_ASN1EncoderContext *cx,
+ const SEC_ASN1Template *theTemplate,
+ const void *src, PRBool new_depth)
+{
+ sec_asn1e_state *state, *new_state;
+
+ if (theTemplate == NULL) {
+ cx->status = encodeError;
+ return NULL;
+ }
+
+ state = cx->current;
+ new_state = (sec_asn1e_state *)PORT_ArenaZAlloc(cx->our_pool,
+ sizeof(*new_state));
+ if (new_state == NULL) {
+ cx->status = encodeError;
+ return NULL;
+ }
+
+ new_state->top = cx;
+ new_state->parent = state;
+ new_state->theTemplate = theTemplate;
+ new_state->place = notInUse;
+ if (src != NULL)
+ new_state->src = (char *)src + theTemplate->offset;
+
+ if (state != NULL) {
+ new_state->depth = state->depth;
+ if (new_depth)
+ new_state->depth++;
+ state->child = new_state;
+ }
+
+ cx->current = new_state;
+ return new_state;
+}
+
+static void
+sec_asn1e_scrub_state(sec_asn1e_state *state)
+{
+ /*
+ * Some default "scrubbing".
+ * XXX right set of initializations?
+ */
+ state->place = beforeHeader;
+ state->indefinite = PR_FALSE;
+}
+
+static void
+sec_asn1e_notify_before(SEC_ASN1EncoderContext *cx, void *src, int depth)
+{
+ if (cx->notify_proc == NULL)
+ return;
+
+ cx->during_notify = PR_TRUE;
+ (*cx->notify_proc)(cx->notify_arg, PR_TRUE, src, depth);
+ cx->during_notify = PR_FALSE;
+}
+
+static void
+sec_asn1e_notify_after(SEC_ASN1EncoderContext *cx, void *src, int depth)
+{
+ if (cx->notify_proc == NULL)
+ return;
+
+ cx->during_notify = PR_TRUE;
+ (*cx->notify_proc)(cx->notify_arg, PR_FALSE, src, depth);
+ cx->during_notify = PR_FALSE;
+}
+
+static sec_asn1e_state *
+sec_asn1e_init_state_based_on_template(sec_asn1e_state *state)
+{
+ PRBool isExplicit, is_string, may_stream, optional, universal;
+ PRBool disallowStreaming;
+ unsigned char tag_modifiers;
+ unsigned long encode_kind, under_kind;
+ unsigned long tag_number;
+ PRBool isInline = PR_FALSE;
+
+ encode_kind = state->theTemplate->kind;
+
+ universal = ((encode_kind & SEC_ASN1_CLASS_MASK) == SEC_ASN1_UNIVERSAL)
+ ? PR_TRUE
+ : PR_FALSE;
+
+ isExplicit = (encode_kind & SEC_ASN1_EXPLICIT) ? PR_TRUE : PR_FALSE;
+ encode_kind &= ~SEC_ASN1_EXPLICIT;
+
+ optional = (encode_kind & SEC_ASN1_OPTIONAL) ? PR_TRUE : PR_FALSE;
+ encode_kind &= ~SEC_ASN1_OPTIONAL;
+
+ PORT_Assert(!(isExplicit && universal)); /* bad templates */
+
+ may_stream = (encode_kind & SEC_ASN1_MAY_STREAM) ? PR_TRUE : PR_FALSE;
+ encode_kind &= ~SEC_ASN1_MAY_STREAM;
+
+ disallowStreaming = (encode_kind & SEC_ASN1_NO_STREAM) ? PR_TRUE : PR_FALSE;
+ encode_kind &= ~SEC_ASN1_NO_STREAM;
+
+ /* Just clear this to get it out of the way; we do not need it here */
+ encode_kind &= ~SEC_ASN1_DYNAMIC;
+
+ if (encode_kind & SEC_ASN1_CHOICE) {
+ under_kind = SEC_ASN1_CHOICE;
+ } else if ((encode_kind & (SEC_ASN1_POINTER | SEC_ASN1_INLINE)) ||
+ (!universal && !isExplicit)) {
+ const SEC_ASN1Template *subt;
+ void *src = NULL;
+
+ PORT_Assert((encode_kind & (SEC_ASN1_ANY | SEC_ASN1_SKIP)) == 0);
+
+ sec_asn1e_scrub_state(state);
+
+ if (encode_kind & SEC_ASN1_POINTER) {
+ src = *(void **)state->src;
+ state->place = afterPointer;
+
+ if (src == NULL) {
+ /*
+ * If this is optional, but NULL, then the field does
+ * not need to be encoded. In this case we are done;
+ * we do not want to push a subtemplate.
+ */
+ if (optional)
+ return state;
+
+ /*
+ * XXX this is an error; need to figure out
+ * how to handle this
+ */
+ }
+ } else {
+ src = state->src;
+ if (encode_kind & SEC_ASN1_INLINE) {
+ /* check that there are no extraneous bits */
+ /* PORT_Assert (encode_kind == SEC_ASN1_INLINE && !optional); */
+ state->place = afterInline;
+ isInline = PR_TRUE;
+ } else {
+ /*
+ * Save the tag modifiers and tag number here before moving
+ * on to the next state in case this is a member of a
+ * SEQUENCE OF
+ */
+ state->tag_modifiers = (unsigned char)(encode_kind & (SEC_ASN1_TAG_MASK & ~SEC_ASN1_TAGNUM_MASK));
+ state->tag_number = (unsigned char)(encode_kind & SEC_ASN1_TAGNUM_MASK);
+
+ state->place = afterImplicit;
+ state->optional = optional;
+ }
+ }
+
+ subt = SEC_ASN1GetSubtemplate(state->theTemplate, state->src, PR_TRUE);
+ if (isInline && optional) {
+ /* we only handle a very limited set of optional inline cases at
+ this time */
+ if (PR_FALSE != SEC_ASN1IsTemplateSimple(subt)) {
+ /* we now know that the target is a SECItem*, so we can check
+ if the source contains one */
+ SECItem *target = (SECItem *)state->src;
+ if (!target || !target->data || !target->len) {
+ /* no valid data to encode subtemplate */
+ return state;
+ }
+ } else {
+ PORT_Assert(0); /* complex templates are not handled as
+ inline optional */
+ }
+ }
+ state = sec_asn1e_push_state(state->top, subt, src, PR_FALSE);
+ if (state == NULL)
+ return state;
+
+ if (universal) {
+ /*
+ * This is a POINTER or INLINE; just init based on that
+ * and we are done.
+ */
+ return sec_asn1e_init_state_based_on_template(state);
+ }
+
+ /*
+ * This is an implicit, non-universal (meaning, application-private
+ * or context-specific) field. This results in a "magic" tag but
+ * encoding based on the underlying type. We pushed a new state
+ * that is based on the subtemplate (the underlying type), but
+ * now we will sort of alias it to give it some of our properties
+ * (tag, optional status, etc.).
+ *
+ * NB: ALL the following flags in the subtemplate are disallowed
+ * and/or ignored: EXPLICIT, OPTIONAL, INNER, INLINE, POINTER.
+ */
+
+ under_kind = state->theTemplate->kind;
+ if ((under_kind & SEC_ASN1_MAY_STREAM) && !disallowStreaming) {
+ may_stream = PR_TRUE;
+ }
+ under_kind &= ~(SEC_ASN1_MAY_STREAM | SEC_ASN1_DYNAMIC);
+ } else {
+ under_kind = encode_kind;
+ }
+
+/*
+ * Sanity check that there are no unwanted bits marked in under_kind.
+ * These bits were either removed above (after we recorded them) or
+ * they simply should not be found (signalling a bad/broken template).
+ * XXX is this the right set of bits to test here? (i.e. need to add
+ * or remove any?)
+ */
+#define UNEXPECTED_FLAGS \
+ (SEC_ASN1_EXPLICIT | SEC_ASN1_OPTIONAL | SEC_ASN1_SKIP | SEC_ASN1_INNER | \
+ SEC_ASN1_DYNAMIC | SEC_ASN1_MAY_STREAM | SEC_ASN1_INLINE | SEC_ASN1_POINTER)
+
+ PORT_Assert((under_kind & UNEXPECTED_FLAGS) == 0);
+ under_kind &= ~UNEXPECTED_FLAGS;
+#undef UNEXPECTED_FLAGS
+
+ if (encode_kind & SEC_ASN1_ANY) {
+ PORT_Assert(encode_kind == under_kind);
+ tag_modifiers = 0;
+ tag_number = 0;
+ is_string = PR_TRUE;
+ } else {
+ tag_modifiers = (unsigned char)(encode_kind & (SEC_ASN1_TAG_MASK & ~SEC_ASN1_TAGNUM_MASK));
+ /*
+ * XXX This assumes only single-octet identifiers. To handle
+ * the HIGH TAG form we would need to do some more work, especially
+ * in how to specify them in the template, because right now we
+ * do not provide a way to specify more *tag* bits in encode_kind.
+ */
+ tag_number = encode_kind & SEC_ASN1_TAGNUM_MASK;
+
+ is_string = PR_FALSE;
+ switch (under_kind & SEC_ASN1_TAGNUM_MASK) {
+ case SEC_ASN1_SET:
+ /*
+ * XXX A plain old SET (as opposed to a SET OF) is not implemented.
+ * If it ever is, remove this assert...
+ */
+ PORT_Assert((under_kind & SEC_ASN1_GROUP) != 0);
+ /* fallthru */
+ case SEC_ASN1_SEQUENCE:
+ tag_modifiers |= SEC_ASN1_CONSTRUCTED;
+ break;
+ case SEC_ASN1_BIT_STRING:
+ case SEC_ASN1_BMP_STRING:
+ case SEC_ASN1_GENERALIZED_TIME:
+ case SEC_ASN1_IA5_STRING:
+ case SEC_ASN1_OCTET_STRING:
+ case SEC_ASN1_PRINTABLE_STRING:
+ case SEC_ASN1_T61_STRING:
+ case SEC_ASN1_UNIVERSAL_STRING:
+ case SEC_ASN1_UTC_TIME:
+ case SEC_ASN1_UTF8_STRING:
+ case SEC_ASN1_VISIBLE_STRING:
+ /*
+ * We do not yet know if we will be constructing the string,
+ * so we have to wait to do this final tag modification.
+ */
+ is_string = PR_TRUE;
+ break;
+ }
+ }
+
+ state->tag_modifiers = tag_modifiers;
+ state->tag_number = (unsigned char)tag_number;
+ state->underlying_kind = under_kind;
+ state->isExplicit = isExplicit;
+ state->may_stream = may_stream;
+ state->is_string = is_string;
+ state->optional = optional;
+ state->disallowStreaming = disallowStreaming;
+
+ sec_asn1e_scrub_state(state);
+
+ return state;
+}
+
+static void
+sec_asn1e_write_part(sec_asn1e_state *state,
+ const char *buf, unsigned long len,
+ SEC_ASN1EncodingPart part)
+{
+ SEC_ASN1EncoderContext *cx;
+
+ cx = state->top;
+ (*cx->output_proc)(cx->output_arg, buf, len, state->depth, part);
+}
+
+/*
+ * XXX This assumes only single-octet identifiers. To handle
+ * the HIGH TAG form we would need to modify this interface and
+ * teach it to properly encode the special form.
+ */
+static void
+sec_asn1e_write_identifier_bytes(sec_asn1e_state *state, unsigned char value)
+{
+ char byte;
+
+ byte = (char)value;
+ sec_asn1e_write_part(state, &byte, 1, SEC_ASN1_Identifier);
+}
+
+int
+SEC_ASN1EncodeLength(unsigned char *buf, int value)
+{
+ int lenlen;
+
+ lenlen = SEC_ASN1LengthLength(value);
+ if (lenlen == 1) {
+ buf[0] = value;
+ } else {
+ int i;
+
+ i = lenlen - 1;
+ buf[0] = 0x80 | i;
+ while (i) {
+ buf[i--] = value;
+ value >>= 8;
+ }
+ PORT_Assert(value == 0);
+ }
+ return lenlen;
+}
+
+static void
+sec_asn1e_write_length_bytes(sec_asn1e_state *state, unsigned long value,
+ PRBool indefinite)
+{
+ int lenlen;
+ unsigned char buf[sizeof(unsigned long) + 1];
+
+ if (indefinite) {
+ PORT_Assert(value == 0);
+ buf[0] = 0x80;
+ lenlen = 1;
+ } else {
+ lenlen = SEC_ASN1EncodeLength(buf, value);
+ }
+
+ sec_asn1e_write_part(state, (char *)buf, lenlen, SEC_ASN1_Length);
+}
+
+static void
+sec_asn1e_write_contents_bytes(sec_asn1e_state *state,
+ const char *buf, unsigned long len)
+{
+ sec_asn1e_write_part(state, buf, len, SEC_ASN1_Contents);
+}
+
+static void
+sec_asn1e_write_end_of_contents_bytes(sec_asn1e_state *state)
+{
+ const char eoc[2] = { 0, 0 };
+
+ sec_asn1e_write_part(state, eoc, 2, SEC_ASN1_EndOfContents);
+}
+
+static int
+sec_asn1e_which_choice(
+ void *src,
+ const SEC_ASN1Template *theTemplate)
+{
+ int rv;
+ unsigned int which = *(unsigned int *)src;
+
+ for (rv = 1, theTemplate++; theTemplate->kind != 0; rv++, theTemplate++) {
+ if (which == theTemplate->size) {
+ return rv;
+ }
+ }
+
+ return 0;
+}
+
+static unsigned long
+sec_asn1e_contents_length(const SEC_ASN1Template *theTemplate, void *src,
+ PRBool disallowStreaming, PRBool insideIndefinite,
+ sec_asn1e_hdr_encoding *pHdrException)
+{
+ unsigned long encode_kind, underlying_kind;
+ PRBool isExplicit, optional, universal, may_stream;
+ unsigned long len;
+
+ /*
+ * This function currently calculates the length in all cases
+ * except the following: when writing out the contents of a
+ * template that belongs to a state where it was a sub-template
+ * with the SEC_ASN1_MAY_STREAM bit set and it's parent had the
+ * optional bit set. The information that the parent is optional
+ * and that we should return the length of 0 when that length is
+ * present since that means the optional field is no longer present.
+ * So we add the disallowStreaming flag which is passed in when
+ * writing the contents, but for all recursive calls to
+ * sec_asn1e_contents_length, we pass PR_FALSE, because this
+ * function correctly calculates the length for children templates
+ * from that point on. Confused yet? At least you didn't have
+ * to figure it out. ;) -javi
+ */
+ encode_kind = theTemplate->kind;
+
+ universal = ((encode_kind & SEC_ASN1_CLASS_MASK) == SEC_ASN1_UNIVERSAL)
+ ? PR_TRUE
+ : PR_FALSE;
+
+ isExplicit = (encode_kind & SEC_ASN1_EXPLICIT) ? PR_TRUE : PR_FALSE;
+ encode_kind &= ~SEC_ASN1_EXPLICIT;
+
+ optional = (encode_kind & SEC_ASN1_OPTIONAL) ? PR_TRUE : PR_FALSE;
+ encode_kind &= ~SEC_ASN1_OPTIONAL;
+
+ PORT_Assert(!(isExplicit && universal)); /* bad templates */
+
+ may_stream = (encode_kind & SEC_ASN1_MAY_STREAM) ? PR_TRUE : PR_FALSE;
+ encode_kind &= ~SEC_ASN1_MAY_STREAM;
+
+ /* Just clear this to get it out of the way; we do not need it here */
+ encode_kind &= ~SEC_ASN1_DYNAMIC;
+
+ if (encode_kind & SEC_ASN1_NO_STREAM) {
+ disallowStreaming = PR_TRUE;
+ }
+ encode_kind &= ~SEC_ASN1_NO_STREAM;
+
+ if (encode_kind & SEC_ASN1_CHOICE) {
+ void *src2;
+ int indx = sec_asn1e_which_choice(src, theTemplate);
+ if (0 == indx) {
+ /* XXX set an error? "choice not found" */
+ /* state->top->status = encodeError; */
+ return 0;
+ }
+
+ src2 = (void *)((char *)src - theTemplate->offset + theTemplate[indx].offset);
+
+ return sec_asn1e_contents_length(&theTemplate[indx], src2,
+ disallowStreaming, insideIndefinite,
+ pHdrException);
+ }
+
+ if ((encode_kind & (SEC_ASN1_POINTER | SEC_ASN1_INLINE)) || !universal) {
+ /* XXX any bits we want to disallow (PORT_Assert against) here? */
+ theTemplate = SEC_ASN1GetSubtemplate(theTemplate, src, PR_TRUE);
+ if (encode_kind & SEC_ASN1_POINTER) {
+ src = *(void **)src;
+ if (src == NULL) {
+ *pHdrException = optional ? hdr_optional : hdr_normal;
+ return 0;
+ }
+ } else if (encode_kind & SEC_ASN1_INLINE) {
+ /* check that there are no extraneous bits */
+ if (optional) {
+ if (PR_FALSE != SEC_ASN1IsTemplateSimple(theTemplate)) {
+ /* we now know that the target is a SECItem*, so we can check
+ if the source contains one */
+ SECItem *target = (SECItem *)src;
+ if (!target || !target->data || !target->len) {
+ /* no valid data to encode subtemplate */
+ *pHdrException = hdr_optional;
+ return 0;
+ }
+ } else {
+ PORT_Assert(0); /* complex templates not handled as inline
+ optional */
+ }
+ }
+ }
+
+ src = (char *)src + theTemplate->offset;
+
+ /* recurse to find the length of the subtemplate */
+ len = sec_asn1e_contents_length(theTemplate, src, disallowStreaming,
+ insideIndefinite, pHdrException);
+ if (len == 0 && optional) {
+ *pHdrException = hdr_optional;
+ } else if (isExplicit) {
+ if (*pHdrException == hdr_any) {
+ /* *we* do not want to add in a header,
+ ** but our caller still does.
+ */
+ *pHdrException = hdr_normal;
+ } else if (*pHdrException == hdr_normal) {
+ /* if the inner content exists, our length is
+ * len(identifier) + len(length) + len(innercontent)
+ * XXX we currently assume len(identifier) == 1;
+ * to support a high-tag-number this would need to be smarter.
+ */
+ len += 1 + SEC_ASN1LengthLength(len);
+ }
+ }
+ return len;
+ }
+ underlying_kind = encode_kind;
+
+ /* This is only used in decoding; it plays no part in encoding. */
+ if (underlying_kind & SEC_ASN1_SAVE) {
+ /* check that there are no extraneous bits */
+ PORT_Assert(underlying_kind == SEC_ASN1_SAVE);
+ *pHdrException = hdr_decoder;
+ return 0;
+ }
+
+#define UNEXPECTED_FLAGS \
+ (SEC_ASN1_EXPLICIT | SEC_ASN1_OPTIONAL | SEC_ASN1_INLINE | SEC_ASN1_POINTER | \
+ SEC_ASN1_DYNAMIC | SEC_ASN1_MAY_STREAM | SEC_ASN1_SAVE | SEC_ASN1_SKIP)
+
+ /* Having any of these bits is not expected here... */
+ PORT_Assert((underlying_kind & UNEXPECTED_FLAGS) == 0);
+ underlying_kind &= ~UNEXPECTED_FLAGS;
+#undef UNEXPECTED_FLAGS
+
+ if (underlying_kind & SEC_ASN1_CHOICE) {
+ void *src2;
+ int indx = sec_asn1e_which_choice(src, theTemplate);
+ if (0 == indx) {
+ /* XXX set an error? "choice not found" */
+ /* state->top->status = encodeError; */
+ return 0;
+ }
+
+ src2 = (void *)((char *)src - theTemplate->offset + theTemplate[indx].offset);
+ len = sec_asn1e_contents_length(&theTemplate[indx], src2,
+ disallowStreaming, insideIndefinite,
+ pHdrException);
+ } else {
+ switch (underlying_kind) {
+ case SEC_ASN1_SEQUENCE_OF:
+ case SEC_ASN1_SET_OF: {
+ const SEC_ASN1Template *tmpt;
+ void *sub_src;
+ unsigned long sub_len;
+ void **group;
+
+ len = 0;
+
+ group = *(void ***)src;
+ if (group == NULL)
+ break;
+
+ tmpt = SEC_ASN1GetSubtemplate(theTemplate, src, PR_TRUE);
+
+ for (; *group != NULL; group++) {
+ sub_src = (char *)(*group) + tmpt->offset;
+ sub_len = sec_asn1e_contents_length(tmpt, sub_src,
+ disallowStreaming,
+ insideIndefinite,
+ pHdrException);
+ len += sub_len;
+ /*
+ * XXX The 1 below is the presumed length of the identifier;
+ * to support a high-tag-number this would need to be smarter.
+ */
+ if (*pHdrException == hdr_normal)
+ len += 1 + SEC_ASN1LengthLength(sub_len);
+ }
+ } break;
+
+ case SEC_ASN1_SEQUENCE:
+ case SEC_ASN1_SET: {
+ const SEC_ASN1Template *tmpt;
+ void *sub_src;
+ unsigned long sub_len;
+
+ len = 0;
+ for (tmpt = theTemplate + 1; tmpt->kind; tmpt++) {
+ sub_src = (char *)src + tmpt->offset;
+ sub_len = sec_asn1e_contents_length(tmpt, sub_src,
+ disallowStreaming,
+ insideIndefinite,
+ pHdrException);
+ len += sub_len;
+ /*
+ * XXX The 1 below is the presumed length of the identifier;
+ * to support a high-tag-number this would need to be smarter.
+ */
+ if (*pHdrException == hdr_normal)
+ len += 1 + SEC_ASN1LengthLength(sub_len);
+ }
+ } break;
+
+ case SEC_ASN1_BIT_STRING:
+ /* convert bit length to byte */
+ len = (((SECItem *)src)->len + 7) >> 3;
+ /* bit string contents involve an extra octet */
+ if (len)
+ len++;
+ break;
+
+ case SEC_ASN1_INTEGER:
+ /* ASN.1 INTEGERs are signed.
+ * If the source is an unsigned integer, the encoder will need
+ * to handle the conversion here.
+ */
+ {
+ unsigned char *buf = ((SECItem *)src)->data;
+ SECItemType integerType = ((SECItem *)src)->type;
+ len = ((SECItem *)src)->len;
+ while (len > 0) {
+ if (*buf != 0) {
+ if (*buf & 0x80 && integerType == siUnsignedInteger) {
+ len++; /* leading zero needed to make number signed */
+ }
+ break; /* reached beginning of number */
+ }
+ if (len == 1) {
+ break; /* the number 0 */
+ }
+ if (buf[1] & 0x80) {
+ break; /* leading zero already present */
+ }
+ /* extraneous leading zero, keep going */
+ buf++;
+ len--;
+ }
+ }
+ break;
+
+ default:
+ len = ((SECItem *)src)->len;
+ break;
+ } /* end switch */
+
+#ifndef WHAT_PROBLEM_DOES_THIS_SOLVE
+ /* if we're streaming, we may have a secitem w/len 0 as placeholder */
+ if (!len && insideIndefinite && may_stream && !disallowStreaming) {
+ len = 1;
+ }
+#endif
+ } /* end else */
+
+ if (len == 0 && optional)
+ *pHdrException = hdr_optional;
+ else if (underlying_kind == SEC_ASN1_ANY)
+ *pHdrException = hdr_any;
+ else
+ *pHdrException = hdr_normal;
+
+ return len;
+}
+
+static void
+sec_asn1e_write_header(sec_asn1e_state *state)
+{
+ unsigned long contents_length;
+ unsigned char tag_number, tag_modifiers;
+ sec_asn1e_hdr_encoding hdrException = hdr_normal;
+ PRBool indefinite = PR_FALSE;
+
+ PORT_Assert(state->place == beforeHeader);
+
+ tag_number = state->tag_number;
+ tag_modifiers = state->tag_modifiers;
+
+ if (state->underlying_kind == SEC_ASN1_ANY) {
+ state->place = duringContents;
+ return;
+ }
+
+ if (state->underlying_kind & SEC_ASN1_CHOICE) {
+ int indx = sec_asn1e_which_choice(state->src, state->theTemplate);
+ if (0 == indx) {
+ /* XXX set an error? "choice not found" */
+ state->top->status = encodeError;
+ return;
+ }
+ state->place = afterChoice;
+ state = sec_asn1e_push_state(state->top, &state->theTemplate[indx],
+ (char *)state->src - state->theTemplate->offset,
+ PR_TRUE);
+ if (state) {
+ /*
+ * Do the "before" field notification.
+ */
+ sec_asn1e_notify_before(state->top, state->src, state->depth);
+ (void)sec_asn1e_init_state_based_on_template(state);
+ }
+ return;
+ }
+
+ /* The !isString test below is apparently intended to ensure that all
+ ** constructed types receive indefinite length encoding.
+ */
+ indefinite = (PRBool)(state->top->streaming && state->may_stream &&
+ (state->top->from_buf || !state->is_string));
+
+ /*
+ * If we are doing a definite-length encoding, first we have to
+ * walk the data structure to calculate the entire contents length.
+ * If we are doing an indefinite-length encoding, we still need to
+ * know if the contents is:
+ * optional and to be omitted, or
+ * an ANY (header is pre-encoded), or
+ * a SAVE or some other kind of template used only by the decoder.
+ * So, we call this function either way.
+ */
+ contents_length = sec_asn1e_contents_length(state->theTemplate,
+ state->src,
+ state->disallowStreaming,
+ indefinite,
+ &hdrException);
+ /*
+ * We might be told explicitly not to put out a header.
+ * But it can also be the case, via a pushed subtemplate, that
+ * sec_asn1e_contents_length could not know that this field is
+ * really optional. So check for that explicitly, too.
+ */
+ if (hdrException != hdr_normal ||
+ (contents_length == 0 && state->optional)) {
+ state->place = afterContents;
+ if (state->top->streaming &&
+ state->may_stream &&
+ state->top->from_buf) {
+ /* we did not find an optional indefinite string, so we
+ * don't encode it. However, if TakeFromBuf is on, we stop
+ * here anyway to give our caller a chance to intercept at the
+ * same point where we would stop if the field were present.
+ */
+ state->top->status = needBytes;
+ }
+ return;
+ }
+
+ if (indefinite) {
+ /*
+ * We need to put out an indefinite-length encoding.
+ * The only universal types that can be constructed are SETs,
+ * SEQUENCEs, and strings; so check that it is one of those,
+ * or that it is not universal (e.g. context-specific).
+ */
+ state->indefinite = PR_TRUE;
+ PORT_Assert((tag_number == SEC_ASN1_SET) || (tag_number == SEC_ASN1_SEQUENCE) || ((tag_modifiers & SEC_ASN1_CLASS_MASK) != 0) || state->is_string);
+ tag_modifiers |= SEC_ASN1_CONSTRUCTED;
+ contents_length = 0;
+ }
+
+ sec_asn1e_write_identifier_bytes(state,
+ (unsigned char)(tag_number | tag_modifiers));
+ sec_asn1e_write_length_bytes(state, contents_length, state->indefinite);
+
+ if (contents_length == 0 && !state->indefinite) {
+ /*
+ * If no real contents to encode, then we are done with this field.
+ */
+ state->place = afterContents;
+ return;
+ }
+
+ /*
+ * An EXPLICIT is nothing but an outer header, which we have already
+ * written. Now we need to do the inner header and contents.
+ */
+ if (state->isExplicit) {
+ const SEC_ASN1Template *subt =
+ SEC_ASN1GetSubtemplate(state->theTemplate, state->src, PR_TRUE);
+ state->place = afterContents;
+ state = sec_asn1e_push_state(state->top, subt, state->src, PR_TRUE);
+ if (state != NULL) {
+ (void)sec_asn1e_init_state_based_on_template(state);
+ }
+ return;
+ }
+
+ switch (state->underlying_kind) {
+ case SEC_ASN1_SET_OF:
+ case SEC_ASN1_SEQUENCE_OF:
+ /*
+ * We need to push a child to handle each member.
+ */
+ {
+ void **group;
+ const SEC_ASN1Template *subt;
+
+ group = *(void ***)state->src;
+ if (group == NULL || *group == NULL) {
+ /*
+ * Group is empty; we are done.
+ */
+ state->place = afterContents;
+ return;
+ }
+ state->place = duringGroup;
+ subt = SEC_ASN1GetSubtemplate(state->theTemplate, state->src,
+ PR_TRUE);
+ state = sec_asn1e_push_state(state->top, subt, *group, PR_TRUE);
+ if (state != NULL) {
+ (void)sec_asn1e_init_state_based_on_template(state);
+ }
+ }
+ break;
+
+ case SEC_ASN1_SEQUENCE:
+ case SEC_ASN1_SET:
+ /*
+ * We need to push a child to handle the individual fields.
+ */
+ state->place = duringSequence;
+ state = sec_asn1e_push_state(state->top, state->theTemplate + 1,
+ state->src, PR_TRUE);
+ if (state != NULL) {
+ /*
+ * Do the "before" field notification.
+ */
+ sec_asn1e_notify_before(state->top, state->src, state->depth);
+ (void)sec_asn1e_init_state_based_on_template(state);
+ }
+ break;
+
+ default:
+ /*
+ * I think we do not need to do anything else.
+ * XXX Correct?
+ */
+ state->place = duringContents;
+ break;
+ }
+}
+
+static void
+sec_asn1e_write_contents_from_buf(sec_asn1e_state *state,
+ const char *buf, unsigned long len)
+{
+ PORT_Assert(state->place == duringContents);
+ PORT_Assert(state->top->from_buf);
+ PORT_Assert(state->may_stream && !state->disallowStreaming);
+
+ /*
+ * Probably they just turned on "take from buf", but have not
+ * yet given us any bytes. If there is nothing in the buffer
+ * then we have nothing to do but return and wait.
+ */
+ if (buf == NULL || len == 0) {
+ state->top->status = needBytes;
+ return;
+ }
+ /*
+ * We are streaming, reading from a passed-in buffer.
+ * This means we are encoding a simple string or an ANY.
+ * For the former, we need to put out a substring, with its
+ * own identifier and length. For an ANY, we just write it
+ * out as is (our caller is required to ensure that it
+ * is a properly encoded entity).
+ */
+ PORT_Assert(state->is_string); /* includes ANY */
+ if (state->underlying_kind != SEC_ASN1_ANY) {
+ unsigned char identifier;
+
+ /*
+ * Create the identifier based on underlying_kind. We cannot
+ * use tag_number and tag_modifiers because this can be an
+ * implicitly encoded field. In that case, the underlying
+ * substrings *are* encoded with their real tag.
+ */
+ identifier = (unsigned char)(state->underlying_kind & SEC_ASN1_TAG_MASK);
+ /*
+ * The underlying kind should just be a simple string; there
+ * should be no bits like CONTEXT_SPECIFIC or CONSTRUCTED set.
+ */
+ PORT_Assert((identifier & SEC_ASN1_TAGNUM_MASK) == identifier);
+ /*
+ * Write out the tag and length for the substring.
+ */
+ sec_asn1e_write_identifier_bytes(state, identifier);
+ if (state->underlying_kind == SEC_ASN1_BIT_STRING) {
+ char byte;
+ /*
+ * Assume we have a length in bytes but we need to output
+ * a proper bit string. This interface only works for bit
+ * strings that are full multiples of 8. If support for
+ * real, variable length bit strings is needed then the
+ * caller will have to know to pass in a bit length instead
+ * of a byte length and then this code will have to
+ * perform the encoding necessary (length written is length
+ * in bytes plus 1, and the first octet of string is the
+ * number of bits remaining between the end of the bit
+ * string and the next byte boundary).
+ */
+ sec_asn1e_write_length_bytes(state, len + 1, PR_FALSE);
+ byte = 0;
+ sec_asn1e_write_contents_bytes(state, &byte, 1);
+ } else {
+ sec_asn1e_write_length_bytes(state, len, PR_FALSE);
+ }
+ }
+ sec_asn1e_write_contents_bytes(state, buf, len);
+ state->top->status = needBytes;
+}
+
+static void
+sec_asn1e_write_contents(sec_asn1e_state *state)
+{
+ unsigned long len = 0;
+
+ PORT_Assert(state->place == duringContents);
+
+ switch (state->underlying_kind) {
+ case SEC_ASN1_SET:
+ case SEC_ASN1_SEQUENCE:
+ PORT_Assert(0);
+ break;
+
+ case SEC_ASN1_BIT_STRING: {
+ SECItem *item;
+ char rem;
+
+ item = (SECItem *)state->src;
+ len = (item->len + 7) >> 3;
+ rem = (unsigned char)((len << 3) - item->len); /* remaining bits */
+ sec_asn1e_write_contents_bytes(state, &rem, 1);
+ sec_asn1e_write_contents_bytes(state, (char *)item->data, len);
+ } break;
+
+ case SEC_ASN1_BMP_STRING:
+ /* The number of bytes must be divisable by 2 */
+ if ((((SECItem *)state->src)->len) % 2) {
+ SEC_ASN1EncoderContext *cx;
+
+ cx = state->top;
+ cx->status = encodeError;
+ break;
+ }
+ /* otherwise, fall through to write the content */
+ goto process_string;
+
+ case SEC_ASN1_UNIVERSAL_STRING:
+ /* The number of bytes must be divisable by 4 */
+ if ((((SECItem *)state->src)->len) % 4) {
+ SEC_ASN1EncoderContext *cx;
+
+ cx = state->top;
+ cx->status = encodeError;
+ break;
+ }
+ /* otherwise, fall through to write the content */
+ goto process_string;
+
+ case SEC_ASN1_INTEGER:
+ /* ASN.1 INTEGERs are signed. If the source is an unsigned
+ * integer, the encoder will need to handle the conversion here.
+ */
+ {
+ unsigned int blen;
+ unsigned char *buf;
+ SECItemType integerType;
+ blen = ((SECItem *)state->src)->len;
+ buf = ((SECItem *)state->src)->data;
+ integerType = ((SECItem *)state->src)->type;
+ while (blen > 0) {
+ if (*buf & 0x80 && integerType == siUnsignedInteger) {
+ char zero = 0; /* write a leading 0 */
+ sec_asn1e_write_contents_bytes(state, &zero, 1);
+ /* and then the remaining buffer */
+ sec_asn1e_write_contents_bytes(state,
+ (char *)buf, blen);
+ break;
+ }
+ /* Check three possibilities:
+ * 1. No leading zeros, msb of MSB is not 1;
+ * 2. The number is zero itself;
+ * 3. Encoding a signed integer with a leading zero,
+ * keep the zero so that the number is positive.
+ */
+ if (*buf != 0 ||
+ blen == 1 ||
+ (buf[1] & 0x80 && integerType != siUnsignedInteger)) {
+ sec_asn1e_write_contents_bytes(state,
+ (char *)buf, blen);
+ break;
+ }
+ /* byte is 0, continue */
+ buf++;
+ blen--;
+ }
+ }
+ /* done with this content */
+ break;
+
+ process_string:
+ default: {
+ SECItem *item;
+
+ item = (SECItem *)state->src;
+ sec_asn1e_write_contents_bytes(state, (char *)item->data,
+ item->len);
+ } break;
+ }
+ state->place = afterContents;
+}
+
+/*
+ * We are doing a SET OF or SEQUENCE OF, and have just finished an item.
+ */
+static void
+sec_asn1e_next_in_group(sec_asn1e_state *state)
+{
+ sec_asn1e_state *child;
+ void **group;
+ void *member;
+
+ PORT_Assert(state->place == duringGroup);
+ PORT_Assert(state->child != NULL);
+
+ child = state->child;
+
+ group = *(void ***)state->src;
+
+ /*
+ * Find placement of current item.
+ */
+ member = (char *)(state->child->src) - child->theTemplate->offset;
+ while (*group != member)
+ group++;
+
+ /*
+ * Move forward to next item.
+ */
+ group++;
+ if (*group == NULL) {
+ /*
+ * That was our last one; we are done now.
+ */
+ child->place = notInUse;
+ state->place = afterContents;
+ return;
+ }
+ child->src = (char *)(*group) + child->theTemplate->offset;
+
+ /*
+ * Re-"push" child.
+ */
+ sec_asn1e_scrub_state(child);
+ state->top->current = child;
+}
+
+/*
+ * We are moving along through a sequence; move forward by one,
+ * (detecting end-of-sequence when it happens).
+ */
+static void
+sec_asn1e_next_in_sequence(sec_asn1e_state *state)
+{
+ sec_asn1e_state *child;
+
+ PORT_Assert(state->place == duringSequence);
+ PORT_Assert(state->child != NULL);
+
+ child = state->child;
+
+ /*
+ * Do the "after" field notification.
+ */
+ sec_asn1e_notify_after(state->top, child->src, child->depth);
+
+ /*
+ * Move forward.
+ */
+ child->theTemplate++;
+ if (child->theTemplate->kind == 0) {
+ /*
+ * We are done with this sequence.
+ */
+ child->place = notInUse;
+ state->place = afterContents;
+ return;
+ }
+
+ /*
+ * Reset state and push.
+ */
+
+ child->src = (char *)state->src + child->theTemplate->offset;
+
+ /*
+ * Do the "before" field notification.
+ */
+ sec_asn1e_notify_before(state->top, child->src, child->depth);
+
+ state->top->current = child;
+ (void)sec_asn1e_init_state_based_on_template(child);
+}
+
+static void
+sec_asn1e_after_contents(sec_asn1e_state *state)
+{
+ PORT_Assert(state->place == afterContents);
+
+ if (state->indefinite)
+ sec_asn1e_write_end_of_contents_bytes(state);
+
+ /*
+ * Just make my parent be the current state. It will then clean
+ * up after me and free me (or reuse me).
+ */
+ state->top->current = state->parent;
+}
+
+/*
+ * This function is called whether or not we are streaming; if we
+ * *are* streaming, our caller can also instruct us to take bytes
+ * from the passed-in buffer (at buf, for length len, which is likely
+ * bytes but could even mean bits if the current field is a bit string).
+ * If we have been so instructed, we will gobble up bytes from there
+ * (rather than from our src structure) and output them, and then
+ * we will just return, expecting to be called again -- either with
+ * more bytes or after our caller has instructed us that we are done
+ * (for now) with the buffer.
+ */
+SECStatus
+SEC_ASN1EncoderUpdate(SEC_ASN1EncoderContext *cx,
+ const char *buf, unsigned long len)
+{
+ sec_asn1e_state *state;
+
+ if (cx->status == needBytes) {
+ cx->status = keepGoing;
+ }
+
+ while (cx->status == keepGoing) {
+ state = cx->current;
+ switch (state->place) {
+ case beforeHeader:
+ sec_asn1e_write_header(state);
+ break;
+ case duringContents:
+ if (cx->from_buf)
+ sec_asn1e_write_contents_from_buf(state, buf, len);
+ else
+ sec_asn1e_write_contents(state);
+ break;
+ case duringGroup:
+ sec_asn1e_next_in_group(state);
+ break;
+ case duringSequence:
+ sec_asn1e_next_in_sequence(state);
+ break;
+ case afterContents:
+ sec_asn1e_after_contents(state);
+ break;
+ case afterImplicit:
+ case afterInline:
+ case afterPointer:
+ case afterChoice:
+ /*
+ * These states are more documentation than anything.
+ * They just need to force a pop.
+ */
+ PORT_Assert(!state->indefinite);
+ state->place = afterContents;
+ break;
+ case notInUse:
+ default:
+ /* This is not an error, but rather a plain old BUG! */
+ PORT_Assert(0);
+ cx->status = encodeError;
+ break;
+ }
+
+ if (cx->status == encodeError)
+ break;
+
+ /* It might have changed, so we have to update our local copy. */
+ state = cx->current;
+
+ /* If it is NULL, we have popped all the way to the top. */
+ if (state == NULL) {
+ cx->status = allDone;
+ break;
+ }
+ }
+
+ if (cx->status == encodeError) {
+ return SECFailure;
+ }
+
+ return SECSuccess;
+}
+
+void
+SEC_ASN1EncoderFinish(SEC_ASN1EncoderContext *cx)
+{
+ /*
+ * XXX anything else that needs to be finished?
+ */
+
+ PORT_FreeArena(cx->our_pool, PR_FALSE);
+}
+
+SEC_ASN1EncoderContext *
+SEC_ASN1EncoderStart(const void *src, const SEC_ASN1Template *theTemplate,
+ SEC_ASN1WriteProc output_proc, void *output_arg)
+{
+ PLArenaPool *our_pool;
+ SEC_ASN1EncoderContext *cx;
+
+ our_pool = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+ if (our_pool == NULL)
+ return NULL;
+
+ cx = (SEC_ASN1EncoderContext *)PORT_ArenaZAlloc(our_pool, sizeof(*cx));
+ if (cx == NULL) {
+ PORT_FreeArena(our_pool, PR_FALSE);
+ return NULL;
+ }
+
+ cx->our_pool = our_pool;
+ cx->output_proc = output_proc;
+ cx->output_arg = output_arg;
+
+ cx->status = keepGoing;
+
+ if (sec_asn1e_push_state(cx, theTemplate, src, PR_FALSE) == NULL ||
+ sec_asn1e_init_state_based_on_template(cx->current) == NULL) {
+ /*
+ * Trouble initializing (probably due to failed allocations)
+ * requires that we just give up.
+ */
+ PORT_FreeArena(our_pool, PR_FALSE);
+ return NULL;
+ }
+
+ return cx;
+}
+
+/*
+ * XXX Do we need a FilterProc, too?
+ */
+
+void
+SEC_ASN1EncoderSetNotifyProc(SEC_ASN1EncoderContext *cx,
+ SEC_ASN1NotifyProc fn, void *arg)
+{
+ cx->notify_proc = fn;
+ cx->notify_arg = arg;
+}
+
+void
+SEC_ASN1EncoderClearNotifyProc(SEC_ASN1EncoderContext *cx)
+{
+ cx->notify_proc = NULL;
+ cx->notify_arg = NULL; /* not necessary; just being clean */
+}
+
+void
+SEC_ASN1EncoderAbort(SEC_ASN1EncoderContext *cx, int error)
+{
+ PORT_Assert(cx);
+ PORT_SetError(error);
+ cx->status = encodeError;
+}
+
+void
+SEC_ASN1EncoderSetStreaming(SEC_ASN1EncoderContext *cx)
+{
+ /* XXX is there a way to check that we are "between" fields here? */
+
+ cx->streaming = PR_TRUE;
+}
+
+void
+SEC_ASN1EncoderClearStreaming(SEC_ASN1EncoderContext *cx)
+{
+ /* XXX is there a way to check that we are "between" fields here? */
+
+ cx->streaming = PR_FALSE;
+}
+
+void
+SEC_ASN1EncoderSetTakeFromBuf(SEC_ASN1EncoderContext *cx)
+{
+ /*
+ * XXX is there a way to check that we are "between" fields here? this
+ * needs to include a check for being in between groups of items in
+ * a SET_OF or SEQUENCE_OF.
+ */
+ PORT_Assert(cx->streaming);
+
+ cx->from_buf = PR_TRUE;
+}
+
+void
+SEC_ASN1EncoderClearTakeFromBuf(SEC_ASN1EncoderContext *cx)
+{
+ /* we should actually be taking from buf *now* */
+ PORT_Assert(cx->from_buf);
+ if (!cx->from_buf) /* if not, just do nothing */
+ return;
+
+ cx->from_buf = PR_FALSE;
+
+ if (cx->status == needBytes) {
+ cx->status = keepGoing;
+ cx->current->place = afterContents;
+ }
+}
+
+SECStatus
+SEC_ASN1Encode(const void *src, const SEC_ASN1Template *theTemplate,
+ SEC_ASN1WriteProc output_proc, void *output_arg)
+{
+ SEC_ASN1EncoderContext *ecx;
+ SECStatus rv;
+
+ ecx = SEC_ASN1EncoderStart(src, theTemplate, output_proc, output_arg);
+ if (ecx == NULL)
+ return SECFailure;
+
+ rv = SEC_ASN1EncoderUpdate(ecx, NULL, 0);
+
+ SEC_ASN1EncoderFinish(ecx);
+ return rv;
+}
+
+/*
+ * XXX depth and data_kind are unused; is there a PC way to silence warnings?
+ * (I mean "politically correct", not anything to do with intel/win platform)
+ */
+static void
+sec_asn1e_encode_item_count(void *arg, const char *buf, unsigned long len,
+ int depth, SEC_ASN1EncodingPart data_kind)
+{
+ unsigned long *count;
+
+ count = (unsigned long *)arg;
+ PORT_Assert(count != NULL);
+
+ *count += len;
+}
+
+/* XXX depth and data_kind are unused; is there a PC way to silence warnings? */
+static void
+sec_asn1e_encode_item_store(void *arg, const char *buf, unsigned long len,
+ int depth, SEC_ASN1EncodingPart data_kind)
+{
+ SECItem *dest;
+
+ dest = (SECItem *)arg;
+ PORT_Assert(dest != NULL);
+
+ if (len > 0) {
+ PORT_Memcpy(dest->data + dest->len, buf, len);
+ dest->len += len;
+ }
+}
+
+/*
+ * Allocate an entire SECItem, or just the data part of it, to hold
+ * "len" bytes of stuff. Allocate from the given pool, if specified,
+ * otherwise just do a vanilla PORT_Alloc.
+ *
+ * XXX This seems like a reasonable general-purpose function (for SECITEM_)?
+ */
+static SECItem *
+sec_asn1e_allocate_item(PLArenaPool *poolp, SECItem *dest, unsigned long len)
+{
+ if (poolp != NULL) {
+ void *release;
+
+ release = PORT_ArenaMark(poolp);
+ if (dest == NULL)
+ dest = (SECItem *)PORT_ArenaAlloc(poolp, sizeof(SECItem));
+ if (dest != NULL) {
+ dest->data = (unsigned char *)PORT_ArenaAlloc(poolp, len);
+ if (dest->data == NULL) {
+ dest = NULL;
+ }
+ }
+ if (dest == NULL) {
+ /* one or both allocations failed; release everything */
+ PORT_ArenaRelease(poolp, release);
+ } else {
+ /* everything okay; unmark the arena */
+ PORT_ArenaUnmark(poolp, release);
+ }
+ } else {
+ SECItem *indest;
+
+ indest = dest;
+ if (dest == NULL)
+ dest = (SECItem *)PORT_Alloc(sizeof(SECItem));
+ if (dest != NULL) {
+ dest->type = siBuffer;
+ dest->data = (unsigned char *)PORT_Alloc(len);
+ if (dest->data == NULL) {
+ if (indest == NULL)
+ PORT_Free(dest);
+ dest = NULL;
+ }
+ }
+ }
+
+ return dest;
+}
+
+SECItem *
+SEC_ASN1EncodeItem(PLArenaPool *poolp, SECItem *dest, const void *src,
+ const SEC_ASN1Template *theTemplate)
+{
+ unsigned long encoding_length;
+ SECStatus rv;
+
+ PORT_Assert(dest == NULL || dest->data == NULL);
+
+ encoding_length = 0;
+ rv = SEC_ASN1Encode(src, theTemplate,
+ sec_asn1e_encode_item_count, &encoding_length);
+ if (rv != SECSuccess)
+ return NULL;
+
+ dest = sec_asn1e_allocate_item(poolp, dest, encoding_length);
+ if (dest == NULL)
+ return NULL;
+
+ /* XXX necessary? This really just checks for a bug in the allocate fn */
+ PORT_Assert(dest->data != NULL);
+ if (dest->data == NULL)
+ return NULL;
+
+ dest->len = 0;
+ (void)SEC_ASN1Encode(src, theTemplate, sec_asn1e_encode_item_store, dest);
+
+ PORT_Assert(encoding_length == dest->len);
+ return dest;
+}
+
+static SECItem *
+sec_asn1e_integer(PLArenaPool *poolp, SECItem *dest, unsigned long value,
+ PRBool is_unsigned)
+{
+ unsigned long copy;
+ unsigned char sign;
+ int len = 0;
+
+ /*
+ * Determine the length of the encoded value (minimum of 1).
+ */
+ copy = value;
+ do {
+ len++;
+ sign = (unsigned char)(copy & 0x80);
+ copy >>= 8;
+ } while (copy);
+
+ /*
+ * If 'value' is non-negative, and the high bit of the last
+ * byte we counted was set, we need to add one to the length so
+ * we put a high-order zero byte in the encoding.
+ */
+ if (sign && (is_unsigned || (long)value >= 0))
+ len++;
+
+ /*
+ * Allocate the item (if necessary) and the data pointer within.
+ */
+ dest = sec_asn1e_allocate_item(poolp, dest, len);
+ if (dest == NULL)
+ return NULL;
+
+ /*
+ * Store the value, byte by byte, in the item.
+ */
+ dest->len = len;
+ while (len) {
+ dest->data[--len] = (unsigned char)value;
+ value >>= 8;
+ }
+ PORT_Assert(value == 0);
+
+ return dest;
+}
+
+SECItem *
+SEC_ASN1EncodeInteger(PLArenaPool *poolp, SECItem *dest, long value)
+{
+ return sec_asn1e_integer(poolp, dest, (unsigned long)value, PR_FALSE);
+}
+
+SECItem *
+SEC_ASN1EncodeUnsignedInteger(PLArenaPool *poolp,
+ SECItem *dest, unsigned long value)
+{
+ return sec_asn1e_integer(poolp, dest, value, PR_TRUE);
+}