diff options
Diffstat (limited to 'security/nss/lib/smime/smimemessage.c')
| -rw-r--r-- | security/nss/lib/smime/smimemessage.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/security/nss/lib/smime/smimemessage.c b/security/nss/lib/smime/smimemessage.c new file mode 100644 index 000000000..774b9f3fd --- /dev/null +++ b/security/nss/lib/smime/smimemessage.c @@ -0,0 +1,183 @@ +/* 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/. */ + +/* + * SMIME message methods + */ + +#include "cmslocal.h" +#include "smime.h" + +#include "cert.h" +#include "key.h" +#include "secasn1.h" +#include "secitem.h" +#include "secoid.h" +#include "pk11func.h" +#include "prtime.h" +#include "secerr.h" + +#if 0 +/* + * NSS_SMIMEMessage_CreateEncrypted - start an S/MIME encrypting context. + * + * "scert" is the cert for the sender. It will be checked for validity. + * "rcerts" are the certs for the recipients. They will also be checked. + * + * "certdb" is the cert database to use for verifying the certs. + * It can be NULL if a default database is available (like in the client). + * + * This function already does all of the stuff specific to S/MIME protocol + * and local policy; the return value just needs to be passed to + * SEC_PKCS7Encode() or to SEC_PKCS7EncoderStart() to create the encoded data, + * and finally to SEC_PKCS7DestroyContentInfo(). + * + * An error results in a return value of NULL and an error set. + * (Retrieve specific errors via PORT_GetError()/XP_GetError().) + */ +NSSCMSMessage * +NSS_SMIMEMessage_CreateEncrypted(CERTCertificate *scert, + CERTCertificate **rcerts, + CERTCertDBHandle *certdb, + PK11PasswordFunc pwfn, + void *pwfn_arg) +{ + NSSCMSMessage *cmsg; + long cipher; + SECOidTag encalg; + int keysize; + int mapi, rci; + + cipher = smime_choose_cipher (scert, rcerts); + if (cipher < 0) + return NULL; + + mapi = smime_mapi_by_cipher (cipher); + if (mapi < 0) + return NULL; + + /* + * XXX This is stretching it -- CreateEnvelopedData should probably + * take a cipher itself of some sort, because we cannot know what the + * future will bring in terms of parameters for each type of algorithm. + * For example, just an algorithm and keysize is *not* sufficient to + * fully specify the usage of RC5 (which also needs to know rounds and + * block size). Work this out into a better API! + */ + encalg = smime_cipher_map[mapi].algtag; + keysize = smime_keysize_by_cipher (cipher); + if (keysize < 0) + return NULL; + + cinfo = SEC_PKCS7CreateEnvelopedData (scert, certUsageEmailRecipient, + certdb, encalg, keysize, + pwfn, pwfn_arg); + if (cinfo == NULL) + return NULL; + + for (rci = 0; rcerts[rci] != NULL; rci++) { + if (rcerts[rci] == scert) + continue; + if (SEC_PKCS7AddRecipient (cinfo, rcerts[rci], certUsageEmailRecipient, + NULL) != SECSuccess) { + SEC_PKCS7DestroyContentInfo (cinfo); + return NULL; + } + } + + return cinfo; +} + + +/* + * Start an S/MIME signing context. + * + * "scert" is the cert that will be used to sign the data. It will be + * checked for validity. + * + * "ecert" is the signer's encryption cert. If it is different from + * scert, then it will be included in the signed message so that the + * recipient can save it for future encryptions. + * + * "certdb" is the cert database to use for verifying the cert. + * It can be NULL if a default database is available (like in the client). + * + * "digestalg" names the digest algorithm (e.g. SEC_OID_SHA1). + * XXX There should be SECMIME functions for hashing, or the hashing should + * be built into this interface, which we would like because we would + * support more smartcards that way, and then this argument should go away.) + * + * "digest" is the actual digest of the data. It must be provided in + * the case of detached data or NULL if the content will be included. + * + * This function already does all of the stuff specific to S/MIME protocol + * and local policy; the return value just needs to be passed to + * SEC_PKCS7Encode() or to SEC_PKCS7EncoderStart() to create the encoded data, + * and finally to SEC_PKCS7DestroyContentInfo(). + * + * An error results in a return value of NULL and an error set. + * (Retrieve specific errors via PORT_GetError()/XP_GetError().) + */ + +NSSCMSMessage * +NSS_SMIMEMessage_CreateSigned(CERTCertificate *scert, + CERTCertificate *ecert, + CERTCertDBHandle *certdb, + SECOidTag digestalgtag, + SECItem *digest, + PK11PasswordFunc pwfn, + void *pwfn_arg) +{ + NSSCMSMessage *cmsg; + NSSCMSSignedData *sigd; + NSSCMSSignerInfo *signerinfo; + + /* See note in header comment above about digestalg. */ + /* Doesn't explain this. PORT_Assert (digestalgtag == SEC_OID_SHA1); */ + + cmsg = NSS_CMSMessage_Create(NULL); + if (cmsg == NULL) + return NULL; + + sigd = NSS_CMSSignedData_Create(cmsg); + if (sigd == NULL) + goto loser; + + /* create just one signerinfo */ + signerinfo = NSS_CMSSignerInfo_Create(cmsg, scert, digestalgtag); + if (signerinfo == NULL) + goto loser; + + /* Add the signing time to the signerinfo. */ + if (NSS_CMSSignerInfo_AddSigningTime(signerinfo, PR_Now()) != SECSuccess) + goto loser; + + /* and add the SMIME profile */ + if (NSS_SMIMESignerInfo_AddSMIMEProfile(signerinfo, scert) != SECSuccess) + goto loser; + + /* now add the signerinfo to the signeddata */ + if (NSS_CMSSignedData_AddSignerInfo(sigd, signerinfo) != SECSuccess) + goto loser; + + /* include the signing cert and its entire chain */ + /* note that there are no checks for duplicate certs in place, as all the */ + /* essential data structures (like set of certificate) are not there */ + if (NSS_CMSSignedData_AddCertChain(sigd, scert) != SECSuccess) + goto loser; + + /* If the encryption cert and the signing cert differ, then include + * the encryption cert too. */ + if ( ( ecert != NULL ) && ( ecert != scert ) ) { + if (NSS_CMSSignedData_AddCertificate(sigd, ecert) != SECSuccess) + goto loser; + } + + return cmsg; +loser: + if (cmsg) + NSS_CMSMessage_Destroy(cmsg); + return NULL; +} +#endif |