diff options
Diffstat (limited to 'security/nss/lib/smime/cmsdecode.c')
| -rw-r--r-- | security/nss/lib/smime/cmsdecode.c | 736 |
1 files changed, 736 insertions, 0 deletions
diff --git a/security/nss/lib/smime/cmsdecode.c b/security/nss/lib/smime/cmsdecode.c new file mode 100644 index 0000000000..e478979840 --- /dev/null +++ b/security/nss/lib/smime/cmsdecode.c @@ -0,0 +1,736 @@ +/* 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/. */ + +/* + * CMS decoding. + */ + +#include "cmslocal.h" + +#include "cert.h" +#include "keyhi.h" +#include "secasn1.h" +#include "secitem.h" +#include "secoid.h" +#include "prtime.h" +#include "secerr.h" + +struct NSSCMSDecoderContextStr { + SEC_ASN1DecoderContext *dcx; /* ASN.1 decoder context */ + NSSCMSMessage *cmsg; /* backpointer to the root message */ + SECOidTag type; /* type of message */ + NSSCMSContent content; /* pointer to message */ + NSSCMSDecoderContext *childp7dcx; /* inner CMS decoder context */ + PRBool saw_contents; + int error; + NSSCMSContentCallback cb; + void *cb_arg; + PRBool first_decoded; + PRBool need_indefinite_finish; +}; + +struct NSSCMSDecoderDataStr { + SECItem data; /* must be first */ + unsigned int totalBufferSize; +}; + +typedef struct NSSCMSDecoderDataStr NSSCMSDecoderData; + +static void nss_cms_decoder_update_filter(void *arg, const char *data, + unsigned long len, int depth, + SEC_ASN1EncodingPart data_kind); +static SECStatus nss_cms_before_data(NSSCMSDecoderContext *p7dcx); +static SECStatus nss_cms_after_data(NSSCMSDecoderContext *p7dcx); +static SECStatus nss_cms_after_end(NSSCMSDecoderContext *p7dcx); +static void nss_cms_decoder_work_data(NSSCMSDecoderContext *p7dcx, + const unsigned char *data, + unsigned long len, + PRBool final); +static NSSCMSDecoderData *nss_cms_create_decoder_data(PLArenaPool *poolp); + +extern const SEC_ASN1Template NSSCMSMessageTemplate[]; + +static NSSCMSDecoderData * +nss_cms_create_decoder_data(PLArenaPool *poolp) +{ + NSSCMSDecoderData *decoderData = NULL; + + decoderData = (NSSCMSDecoderData *) + PORT_ArenaAlloc(poolp, sizeof(NSSCMSDecoderData)); + if (!decoderData) { + return NULL; + } + decoderData->data.data = NULL; + decoderData->data.len = 0; + decoderData->totalBufferSize = 0; + return decoderData; +} + +/* + * nss_cms_decoder_notify - + * this is the driver of the decoding process. It gets called by the ASN.1 + * decoder before and after an object is decoded. + * at various points in the decoding process, we intercept to set up and do + * further processing. + */ +static void +nss_cms_decoder_notify(void *arg, PRBool before, void *dest, int depth) +{ + NSSCMSDecoderContext *p7dcx; + NSSCMSContentInfo *rootcinfo, *cinfo; + PRBool after = !before; + + p7dcx = (NSSCMSDecoderContext *)arg; + rootcinfo = &(p7dcx->cmsg->contentInfo); + + /* XXX error handling: need to set p7dcx->error */ + +#ifdef CMSDEBUG + fprintf(stderr, "%6.6s, dest = 0x%08x, depth = %d\n", before ? "before" : "after", + dest, depth); +#endif + + /* so what are we working on right now? */ + if (p7dcx->type == SEC_OID_UNKNOWN) { + /* + * right now, we are still decoding the OUTER (root) cinfo + * As soon as we know the inner content type, set up the info, + * but NO inner decoder or filter. The root decoder handles the first + * level children by itself - only for encapsulated contents (which + * are encoded as DER inside of an OCTET STRING) we need to set up a + * child decoder... + */ + if (after && dest == &(rootcinfo->contentType)) { + p7dcx->type = NSS_CMSContentInfo_GetContentTypeTag(rootcinfo); + p7dcx->content = rootcinfo->content; + /* is this ready already ? need to alloc? */ + /* XXX yes we need to alloc -- continue here */ + } + } else if (NSS_CMSType_IsData(p7dcx->type)) { + /* this can only happen if the outermost cinfo has DATA in it */ + /* otherwise, we handle this type implicitely in the inner decoders */ + + if (before && dest == &(rootcinfo->content)) { + /* cause the filter to put the data in the right place... + ** We want the ASN.1 decoder to deliver the decoded bytes to us + ** from now on + */ + SEC_ASN1DecoderSetFilterProc(p7dcx->dcx, + nss_cms_decoder_update_filter, + p7dcx, + (PRBool)(p7dcx->cb != NULL)); + } else if (after && dest == &(rootcinfo->content.data)) { + /* remove the filter */ + SEC_ASN1DecoderClearFilterProc(p7dcx->dcx); + } + } else if (NSS_CMSType_IsWrapper(p7dcx->type)) { + if (!before || dest != &(rootcinfo->content)) { + + if (p7dcx->content.pointer == NULL) + p7dcx->content = rootcinfo->content; + + /* get this data type's inner contentInfo */ + cinfo = NSS_CMSContent_GetContentInfo(p7dcx->content.pointer, + p7dcx->type); + + if (before && dest == &(cinfo->contentType)) { + /* at this point, set up the &%$&$ back pointer */ + /* we cannot do it later, because the content itself + * is optional! */ + switch (p7dcx->type) { + case SEC_OID_PKCS7_SIGNED_DATA: + p7dcx->content.signedData->cmsg = p7dcx->cmsg; + break; + case SEC_OID_PKCS7_DIGESTED_DATA: + p7dcx->content.digestedData->cmsg = p7dcx->cmsg; + break; + case SEC_OID_PKCS7_ENVELOPED_DATA: + p7dcx->content.envelopedData->cmsg = p7dcx->cmsg; + break; + case SEC_OID_PKCS7_ENCRYPTED_DATA: + p7dcx->content.encryptedData->cmsg = p7dcx->cmsg; + break; + default: + p7dcx->content.genericData->cmsg = p7dcx->cmsg; + break; + } + } + + if (before && dest == &(cinfo->rawContent)) { + /* we want the ASN.1 decoder to deliver the decoded bytes to us + ** from now on + */ + SEC_ASN1DecoderSetFilterProc(p7dcx->dcx, + nss_cms_decoder_update_filter, + p7dcx, (PRBool)(p7dcx->cb != NULL)); + + /* we're right in front of the data */ + if (nss_cms_before_data(p7dcx) != SECSuccess) { + SEC_ASN1DecoderClearFilterProc(p7dcx->dcx); + /* stop all processing */ + p7dcx->error = PORT_GetError(); + } + } + if (after && dest == &(cinfo->rawContent)) { + /* we're right after of the data */ + if (nss_cms_after_data(p7dcx) != SECSuccess) + p7dcx->error = PORT_GetError(); + + /* we don't need to see the contents anymore */ + SEC_ASN1DecoderClearFilterProc(p7dcx->dcx); + } + } + } else { + /* unsupported or unknown message type - fail gracefully */ + p7dcx->error = SEC_ERROR_UNSUPPORTED_MESSAGE_TYPE; + } +} + +/* + * nss_cms_before_data - set up the current encoder to receive data + */ +static SECStatus +nss_cms_before_data(NSSCMSDecoderContext *p7dcx) +{ + SECStatus rv; + SECOidTag childtype; + PLArenaPool *poolp; + NSSCMSDecoderContext *childp7dcx; + NSSCMSContentInfo *cinfo; + const SEC_ASN1Template *template; + void *mark = NULL; + size_t size; + + poolp = p7dcx->cmsg->poolp; + + /* call _Decode_BeforeData handlers */ + switch (p7dcx->type) { + case SEC_OID_PKCS7_SIGNED_DATA: + /* we're decoding a signedData, so set up the digests */ + rv = NSS_CMSSignedData_Decode_BeforeData(p7dcx->content.signedData); + break; + case SEC_OID_PKCS7_DIGESTED_DATA: + /* we're encoding a digestedData, so set up the digest */ + rv = NSS_CMSDigestedData_Decode_BeforeData(p7dcx->content.digestedData); + break; + case SEC_OID_PKCS7_ENVELOPED_DATA: + rv = NSS_CMSEnvelopedData_Decode_BeforeData( + p7dcx->content.envelopedData); + break; + case SEC_OID_PKCS7_ENCRYPTED_DATA: + rv = NSS_CMSEncryptedData_Decode_BeforeData( + p7dcx->content.encryptedData); + break; + default: + rv = NSS_CMSGenericWrapperData_Decode_BeforeData(p7dcx->type, + p7dcx->content.genericData); + } + if (rv != SECSuccess) + return SECFailure; + + /* ok, now we have a pointer to cinfo */ + /* find out what kind of data is encapsulated */ + + cinfo = NSS_CMSContent_GetContentInfo(p7dcx->content.pointer, p7dcx->type); + childtype = NSS_CMSContentInfo_GetContentTypeTag(cinfo); + + if (NSS_CMSType_IsData(childtype)) { + cinfo->content.pointer = (void *)nss_cms_create_decoder_data(poolp); + if (cinfo->content.pointer == NULL) + /* set memory error */ + return SECFailure; + + p7dcx->childp7dcx = NULL; + return SECSuccess; + } + + /* set up inner decoder */ + + if ((template = NSS_CMSUtil_GetTemplateByTypeTag(childtype)) == NULL) + return SECFailure; + + childp7dcx = PORT_ZNew(NSSCMSDecoderContext); + if (childp7dcx == NULL) + return SECFailure; + + mark = PORT_ArenaMark(poolp); + + /* allocate space for the stuff we're creating */ + size = NSS_CMSUtil_GetSizeByTypeTag(childtype); + childp7dcx->content.pointer = (void *)PORT_ArenaZAlloc(poolp, size); + if (childp7dcx->content.pointer == NULL) + goto loser; + + /* give the parent a copy of the pointer so that it doesn't get lost */ + cinfo->content.pointer = childp7dcx->content.pointer; + + /* start the child decoder */ + childp7dcx->dcx = SEC_ASN1DecoderStart(poolp, childp7dcx->content.pointer, + template); + if (childp7dcx->dcx == NULL) + goto loser; + + /* the new decoder needs to notify, too */ + SEC_ASN1DecoderSetNotifyProc(childp7dcx->dcx, nss_cms_decoder_notify, + childp7dcx); + + /* tell the parent decoder that it needs to feed us the content data */ + p7dcx->childp7dcx = childp7dcx; + + childp7dcx->type = childtype; /* our type */ + + childp7dcx->cmsg = p7dcx->cmsg; /* backpointer to root message */ + + /* should the child decoder encounter real data, + ** it must give it to the caller + */ + childp7dcx->cb = p7dcx->cb; + childp7dcx->cb_arg = p7dcx->cb_arg; + childp7dcx->first_decoded = PR_FALSE; + childp7dcx->need_indefinite_finish = PR_FALSE; + if (childtype == SEC_OID_PKCS7_SIGNED_DATA) { + childp7dcx->first_decoded = PR_TRUE; + } + + /* now set up the parent to hand decoded data to the next level decoder */ + p7dcx->cb = (NSSCMSContentCallback)NSS_CMSDecoder_Update; + p7dcx->cb_arg = childp7dcx; + + PORT_ArenaUnmark(poolp, mark); + + return SECSuccess; + +loser: + if (mark) + PORT_ArenaRelease(poolp, mark); + PORT_Free(childp7dcx); + p7dcx->childp7dcx = NULL; + return SECFailure; +} + +static SECStatus +nss_cms_after_data(NSSCMSDecoderContext *p7dcx) +{ + NSSCMSDecoderContext *childp7dcx; + SECStatus rv = SECFailure; + + /* Handle last block. This is necessary to flush out the last bytes + * of a possibly incomplete block */ + nss_cms_decoder_work_data(p7dcx, NULL, 0, PR_TRUE); + + /* finish any "inner" decoders - there's no more data coming... */ + if (p7dcx->childp7dcx != NULL) { + childp7dcx = p7dcx->childp7dcx; + if (childp7dcx->dcx != NULL) { + /* we started and indefinite sequence somewhere, not complete it */ + if (childp7dcx->need_indefinite_finish) { + static const char lbuf[2] = { 0, 0 }; + NSS_CMSDecoder_Update(childp7dcx, lbuf, sizeof(lbuf)); + childp7dcx->need_indefinite_finish = PR_FALSE; + } + + if (SEC_ASN1DecoderFinish(childp7dcx->dcx) != SECSuccess) { + /* do what? free content? */ + rv = SECFailure; + } else { + rv = nss_cms_after_end(childp7dcx); + } + if (rv != SECSuccess) + goto done; + } + PORT_Free(p7dcx->childp7dcx); + p7dcx->childp7dcx = NULL; + } + + switch (p7dcx->type) { + case SEC_OID_PKCS7_SIGNED_DATA: + /* this will finish the digests and verify */ + rv = NSS_CMSSignedData_Decode_AfterData(p7dcx->content.signedData); + break; + case SEC_OID_PKCS7_ENVELOPED_DATA: + rv = NSS_CMSEnvelopedData_Decode_AfterData( + p7dcx->content.envelopedData); + break; + case SEC_OID_PKCS7_DIGESTED_DATA: + rv = NSS_CMSDigestedData_Decode_AfterData( + p7dcx->content.digestedData); + break; + case SEC_OID_PKCS7_ENCRYPTED_DATA: + rv = NSS_CMSEncryptedData_Decode_AfterData( + p7dcx->content.encryptedData); + break; + case SEC_OID_PKCS7_DATA: + /* do nothing */ + break; + default: + rv = NSS_CMSGenericWrapperData_Decode_AfterData(p7dcx->type, + p7dcx->content.genericData); + break; + } +done: + return rv; +} + +static SECStatus +nss_cms_after_end(NSSCMSDecoderContext *p7dcx) +{ + SECStatus rv = SECSuccess; + + switch (p7dcx->type) { + case SEC_OID_PKCS7_SIGNED_DATA: + if (p7dcx->content.signedData) + rv = NSS_CMSSignedData_Decode_AfterEnd(p7dcx->content.signedData); + break; + case SEC_OID_PKCS7_ENVELOPED_DATA: + if (p7dcx->content.envelopedData) + rv = NSS_CMSEnvelopedData_Decode_AfterEnd( + p7dcx->content.envelopedData); + break; + case SEC_OID_PKCS7_DIGESTED_DATA: + if (p7dcx->content.digestedData) + rv = NSS_CMSDigestedData_Decode_AfterEnd( + p7dcx->content.digestedData); + break; + case SEC_OID_PKCS7_ENCRYPTED_DATA: + if (p7dcx->content.encryptedData) + rv = NSS_CMSEncryptedData_Decode_AfterEnd( + p7dcx->content.encryptedData); + break; + case SEC_OID_PKCS7_DATA: + break; + default: + rv = NSS_CMSGenericWrapperData_Decode_AfterEnd(p7dcx->type, + p7dcx->content.genericData); + break; + } + return rv; +} + +/* + * nss_cms_decoder_work_data - handle decoded data bytes. + * + * This function either decrypts the data if needed, and/or calculates digests + * on it, then either stores it or passes it on to the next level decoder. + */ +static void +nss_cms_decoder_work_data(NSSCMSDecoderContext *p7dcx, + const unsigned char *data, unsigned long len, + PRBool final) +{ + NSSCMSContentInfo *cinfo; + unsigned char *buf = NULL; + unsigned char *dest; + unsigned int offset; + SECStatus rv; + + /* + * We should really have data to process, or we should be trying + * to finish/flush the last block. (This is an overly paranoid + * check since all callers are in this file and simple inspection + * proves they do it right. But it could find a bug in future + * modifications/development, that is why it is here.) + */ + PORT_Assert((data != NULL && len) || final); + + cinfo = NSS_CMSContent_GetContentInfo(p7dcx->content.pointer, p7dcx->type); + if (!cinfo) { + /* The original programmer didn't expect this to happen */ + p7dcx->error = SEC_ERROR_LIBRARY_FAILURE; + goto loser; + } + + if (cinfo->privateInfo && cinfo->privateInfo->ciphcx != NULL) { + /* + * we are decrypting. + * + * XXX If we get an error, we do not want to do the digest or callback, + * but we want to keep decoding. Or maybe we want to stop decoding + * altogether if there is a callback, because obviously we are not + * sending the data back and they want to know that. + */ + + unsigned int outlen = 0; /* length of decrypted data */ + unsigned int buflen; /* length available for decrypted data */ + + /* find out about the length of decrypted data */ + buflen = NSS_CMSCipherContext_DecryptLength(cinfo->privateInfo->ciphcx, len, final); + + /* + * it might happen that we did not provide enough data for a full + * block (decryption unit), and that there is no output available + */ + + /* no output available, AND no input? */ + if (buflen == 0 && len == 0) + goto loser; /* bail out */ + + /* + * have inner decoder: pass the data on (means inner content type is NOT data) + * no inner decoder: we have DATA in here: either call callback or store + */ + if (buflen != 0) { + /* there will be some output - need to make room for it */ + /* allocate buffer from the heap */ + buf = (unsigned char *)PORT_Alloc(buflen); + if (buf == NULL) { + p7dcx->error = SEC_ERROR_NO_MEMORY; + goto loser; + } + } + + /* + * decrypt incoming data + * buf can still be NULL here (and buflen == 0) here if we don't expect + * any output (see above), but we still need to call NSS_CMSCipherContext_Decrypt to + * keep track of incoming data + */ + rv = NSS_CMSCipherContext_Decrypt(cinfo->privateInfo->ciphcx, buf, &outlen, buflen, + data, len, final); + if (rv != SECSuccess) { + p7dcx->error = PORT_GetError(); + goto loser; + } + + PORT_Assert(final || outlen == buflen); + + /* swap decrypted data in */ + data = buf; + len = outlen; + } + + if (len == 0) + goto done; /* nothing more to do */ + + /* + * Update the running digests with plaintext bytes (if we need to). + */ + if (cinfo->privateInfo && cinfo->privateInfo->digcx) + NSS_CMSDigestContext_Update(cinfo->privateInfo->digcx, data, len); + + /* at this point, we have the plain decoded & decrypted data + ** which is either more encoded DER (which we need to hand to the child + ** decoder) or data we need to hand back to our caller + */ + + /* pass the content back to our caller or */ + /* feed our freshly decrypted and decoded data into child decoder */ + if (p7dcx->cb != NULL) { + (*p7dcx->cb)(p7dcx->cb_arg, (const char *)data, len); + } +#if 1 + else +#endif + if (NSS_CMSContentInfo_GetContentTypeTag(cinfo) == SEC_OID_PKCS7_DATA) { + /* store it in "inner" data item as well */ + /* find the DATA item in the encapsulated cinfo and store it there */ + NSSCMSDecoderData *decoderData = + (NSSCMSDecoderData *)cinfo->content.pointer; + SECItem *dataItem = &decoderData->data; + + offset = dataItem->len; + if (dataItem->len + len > decoderData->totalBufferSize) { + int needLen = (dataItem->len + len) * 2; + dest = (unsigned char *) + PORT_ArenaAlloc(p7dcx->cmsg->poolp, needLen); + if (dest == NULL) { + p7dcx->error = SEC_ERROR_NO_MEMORY; + goto loser; + } + + if (dataItem->len) { + PORT_Memcpy(dest, dataItem->data, dataItem->len); + } + decoderData->totalBufferSize = needLen; + dataItem->data = dest; + } + + /* copy it in */ + PORT_Memcpy(dataItem->data + offset, data, len); + dataItem->len += len; + } + +done: +loser: + if (buf) + PORT_Free(buf); +} + +/* + * nss_cms_decoder_update_filter - process ASN.1 data + * + * once we have set up a filter in nss_cms_decoder_notify(), + * all data processed by the ASN.1 decoder is also passed through here. + * we pass the content bytes (as opposed to length and tag bytes) on to + * nss_cms_decoder_work_data(). + */ +static void +nss_cms_decoder_update_filter(void *arg, const char *data, unsigned long len, + int depth, SEC_ASN1EncodingPart data_kind) +{ + NSSCMSDecoderContext *p7dcx; + + PORT_Assert(len); /* paranoia */ + if (len == 0) + return; + + p7dcx = (NSSCMSDecoderContext *)arg; + + p7dcx->saw_contents = PR_TRUE; + + /* pass on the content bytes only */ + if (data_kind == SEC_ASN1_Contents) + nss_cms_decoder_work_data(p7dcx, (const unsigned char *)data, len, + PR_FALSE); +} + +/* + * NSS_CMSDecoder_Start - set up decoding of a DER-encoded CMS message + * + * "poolp" - pointer to arena for message, or NULL if new pool should be created + * "cb", "cb_arg" - callback function and argument for delivery of inner content + * "pwfn", pwfn_arg" - callback function for getting token password + * "decrypt_key_cb", "decrypt_key_cb_arg" - callback function for getting bulk key for encryptedData + */ +NSSCMSDecoderContext * +NSS_CMSDecoder_Start(PLArenaPool *poolp, + NSSCMSContentCallback cb, void *cb_arg, + PK11PasswordFunc pwfn, void *pwfn_arg, + NSSCMSGetDecryptKeyCallback decrypt_key_cb, + void *decrypt_key_cb_arg) +{ + NSSCMSDecoderContext *p7dcx; + NSSCMSMessage *cmsg; + + cmsg = NSS_CMSMessage_Create(poolp); + if (cmsg == NULL) + return NULL; + + NSS_CMSMessage_SetEncodingParams(cmsg, pwfn, pwfn_arg, decrypt_key_cb, + decrypt_key_cb_arg, NULL, NULL); + + p7dcx = PORT_ZNew(NSSCMSDecoderContext); + if (p7dcx == NULL) { + NSS_CMSMessage_Destroy(cmsg); + return NULL; + } + + p7dcx->dcx = SEC_ASN1DecoderStart(cmsg->poolp, cmsg, NSSCMSMessageTemplate); + if (p7dcx->dcx == NULL) { + PORT_Free(p7dcx); + NSS_CMSMessage_Destroy(cmsg); + return NULL; + } + + SEC_ASN1DecoderSetNotifyProc(p7dcx->dcx, nss_cms_decoder_notify, p7dcx); + + p7dcx->cmsg = cmsg; + p7dcx->type = SEC_OID_UNKNOWN; + + p7dcx->cb = cb; + p7dcx->cb_arg = cb_arg; + p7dcx->first_decoded = PR_FALSE; + p7dcx->need_indefinite_finish = PR_FALSE; + return p7dcx; +} + +/* + * NSS_CMSDecoder_Update - feed DER-encoded data to decoder + */ +SECStatus +NSS_CMSDecoder_Update(NSSCMSDecoderContext *p7dcx, const char *buf, + unsigned long len) +{ + SECStatus rv = SECSuccess; + if (p7dcx->dcx != NULL && p7dcx->error == 0) { + /* if error is set already, don't bother */ + if ((p7dcx->type == SEC_OID_PKCS7_SIGNED_DATA) && (p7dcx->first_decoded == PR_TRUE) && (buf[0] == SEC_ASN1_INTEGER)) { + /* Microsoft Windows 2008 left out the Sequence wrapping in some + * of their kerberos replies. If we are here, we most likely are + * dealing with one of those replies. Supply the Sequence wrap + * as indefinite encoding (since we don't know the total length + * yet) */ + static const char lbuf[2] = { SEC_ASN1_SEQUENCE | SEC_ASN1_CONSTRUCTED, 0x80 }; + rv = SEC_ASN1DecoderUpdate(p7dcx->dcx, lbuf, sizeof(lbuf)); + if (rv != SECSuccess) { + goto loser; + } + /* ok, we're going to need the indefinite finish when we are done */ + p7dcx->need_indefinite_finish = PR_TRUE; + } + + rv = SEC_ASN1DecoderUpdate(p7dcx->dcx, buf, len); + } + +loser: + p7dcx->first_decoded = PR_FALSE; + if (rv != SECSuccess) { + p7dcx->error = PORT_GetError(); + PORT_Assert(p7dcx->error); + if (p7dcx->error == 0) + p7dcx->error = -1; + } + + if (p7dcx->error == 0) + return SECSuccess; + + /* there has been a problem, let's finish the decoder */ + if (p7dcx->dcx != NULL) { + (void)SEC_ASN1DecoderFinish(p7dcx->dcx); + p7dcx->dcx = NULL; + } + PORT_SetError(p7dcx->error); + + return SECFailure; +} + +/* + * NSS_CMSDecoder_Cancel - stop decoding in case of error + */ +void +NSS_CMSDecoder_Cancel(NSSCMSDecoderContext *p7dcx) +{ + if (p7dcx->dcx != NULL) + (void)SEC_ASN1DecoderFinish(p7dcx->dcx); + NSS_CMSMessage_Destroy(p7dcx->cmsg); + PORT_Free(p7dcx); +} + +/* + * NSS_CMSDecoder_Finish - mark the end of inner content and finish decoding + */ +NSSCMSMessage * +NSS_CMSDecoder_Finish(NSSCMSDecoderContext *p7dcx) +{ + NSSCMSMessage *cmsg; + + cmsg = p7dcx->cmsg; + + if (p7dcx->dcx == NULL || + SEC_ASN1DecoderFinish(p7dcx->dcx) != SECSuccess || + nss_cms_after_end(p7dcx) != SECSuccess) { + NSS_CMSMessage_Destroy(cmsg); /* get rid of pool if it's ours */ + cmsg = NULL; + } + + PORT_Free(p7dcx); + return cmsg; +} + +NSSCMSMessage * +NSS_CMSMessage_CreateFromDER(SECItem *DERmessage, + NSSCMSContentCallback cb, void *cb_arg, + PK11PasswordFunc pwfn, void *pwfn_arg, + NSSCMSGetDecryptKeyCallback decrypt_key_cb, + void *decrypt_key_cb_arg) +{ + NSSCMSDecoderContext *p7dcx; + + /* first arg(poolp) == NULL => create our own pool */ + p7dcx = NSS_CMSDecoder_Start(NULL, cb, cb_arg, pwfn, pwfn_arg, + decrypt_key_cb, decrypt_key_cb_arg); + if (p7dcx == NULL) + return NULL; + NSS_CMSDecoder_Update(p7dcx, (char *)DERmessage->data, DERmessage->len); + return NSS_CMSDecoder_Finish(p7dcx); +} |