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comparison: security/nss/lib/smime/cmsencdata.c
security/nss/lib/smime/cmsencdata.c
- changeset 2
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| -1:000000000000 | 0:8d14dcd16c06 |
|---|---|
| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 | |
| 5 /* | |
| 6 * CMS encryptedData methods. | |
| 7 */ | |
| 8 | |
| 9 #include "cmslocal.h" | |
| 10 | |
| 11 #include "key.h" | |
| 12 #include "secasn1.h" | |
| 13 #include "secitem.h" | |
| 14 #include "secoid.h" | |
| 15 #include "pk11func.h" | |
| 16 #include "prtime.h" | |
| 17 #include "secerr.h" | |
| 18 #include "secpkcs5.h" | |
| 19 | |
| 20 /* | |
| 21 * NSS_CMSEncryptedData_Create - create an empty encryptedData object. | |
| 22 * | |
| 23 * "algorithm" specifies the bulk encryption algorithm to use. | |
| 24 * "keysize" is the key size. | |
| 25 * | |
| 26 * An error results in a return value of NULL and an error set. | |
| 27 * (Retrieve specific errors via PORT_GetError()/XP_GetError().) | |
| 28 */ | |
| 29 NSSCMSEncryptedData * | |
| 30 NSS_CMSEncryptedData_Create(NSSCMSMessage *cmsg, SECOidTag algorithm, | |
| 31 int keysize) | |
| 32 { | |
| 33 void *mark; | |
| 34 NSSCMSEncryptedData *encd; | |
| 35 PLArenaPool *poolp; | |
| 36 SECAlgorithmID *pbe_algid; | |
| 37 SECStatus rv; | |
| 38 | |
| 39 poolp = cmsg->poolp; | |
| 40 | |
| 41 mark = PORT_ArenaMark(poolp); | |
| 42 | |
| 43 encd = PORT_ArenaZNew(poolp, NSSCMSEncryptedData); | |
| 44 if (encd == NULL) | |
| 45 goto loser; | |
| 46 | |
| 47 encd->cmsg = cmsg; | |
| 48 | |
| 49 /* version is set in NSS_CMSEncryptedData_Encode_BeforeStart() */ | |
| 50 | |
| 51 if (!SEC_PKCS5IsAlgorithmPBEAlgTag(algorithm)) { | |
| 52 rv = NSS_CMSContentInfo_SetContentEncAlg(poolp, &(encd->contentInfo), | |
| 53 algorithm, NULL, keysize); | |
| 54 } else { | |
| 55 /* Assume password-based-encryption. | |
| 56 * Note: we can't generate pkcs5v2 from this interface. | |
| 57 * PK11_CreateBPEAlgorithmID generates pkcs5v2 by accepting | |
| 58 * non-PBE oids and assuming that they are pkcs5v2 oids, but | |
| 59 * NSS_CMSEncryptedData_Create accepts non-PBE oids as regular | |
| 60 * CMS encrypted data, so we can't tell NSS_CMS_EncryptedData_Create | |
| 61 * to create pkcs5v2 PBEs */ | |
| 62 pbe_algid = PK11_CreatePBEAlgorithmID(algorithm, 1, NULL); | |
| 63 if (pbe_algid == NULL) { | |
| 64 rv = SECFailure; | |
| 65 } else { | |
| 66 rv = NSS_CMSContentInfo_SetContentEncAlgID(poolp, | |
| 67 &(encd->contentInfo), pbe_algid, keysize); | |
| 68 SECOID_DestroyAlgorithmID (pbe_algid, PR_TRUE); | |
| 69 } | |
| 70 } | |
| 71 if (rv != SECSuccess) | |
| 72 goto loser; | |
| 73 | |
| 74 PORT_ArenaUnmark(poolp, mark); | |
| 75 return encd; | |
| 76 | |
| 77 loser: | |
| 78 PORT_ArenaRelease(poolp, mark); | |
| 79 return NULL; | |
| 80 } | |
| 81 | |
| 82 /* | |
| 83 * NSS_CMSEncryptedData_Destroy - destroy an encryptedData object | |
| 84 */ | |
| 85 void | |
| 86 NSS_CMSEncryptedData_Destroy(NSSCMSEncryptedData *encd) | |
| 87 { | |
| 88 /* everything's in a pool, so don't worry about the storage */ | |
| 89 NSS_CMSContentInfo_Destroy(&(encd->contentInfo)); | |
| 90 return; | |
| 91 } | |
| 92 | |
| 93 /* | |
| 94 * NSS_CMSEncryptedData_GetContentInfo - return pointer to encryptedData object's contentInfo | |
| 95 */ | |
| 96 NSSCMSContentInfo * | |
| 97 NSS_CMSEncryptedData_GetContentInfo(NSSCMSEncryptedData *encd) | |
| 98 { | |
| 99 return &(encd->contentInfo); | |
| 100 } | |
| 101 | |
| 102 /* | |
| 103 * NSS_CMSEncryptedData_Encode_BeforeStart - do all the necessary things to a EncryptedData | |
| 104 * before encoding begins. | |
| 105 * | |
| 106 * In particular: | |
| 107 * - set the correct version value. | |
| 108 * - get the encryption key | |
| 109 */ | |
| 110 SECStatus | |
| 111 NSS_CMSEncryptedData_Encode_BeforeStart(NSSCMSEncryptedData *encd) | |
| 112 { | |
| 113 int version; | |
| 114 PK11SymKey *bulkkey = NULL; | |
| 115 SECItem *dummy; | |
| 116 NSSCMSContentInfo *cinfo = &(encd->contentInfo); | |
| 117 | |
| 118 if (NSS_CMSArray_IsEmpty((void **)encd->unprotectedAttr)) | |
| 119 version = NSS_CMS_ENCRYPTED_DATA_VERSION; | |
| 120 else | |
| 121 version = NSS_CMS_ENCRYPTED_DATA_VERSION_UPATTR; | |
| 122 | |
| 123 dummy = SEC_ASN1EncodeInteger (encd->cmsg->poolp, &(encd->version), version); | |
| 124 if (dummy == NULL) | |
| 125 return SECFailure; | |
| 126 | |
| 127 /* now get content encryption key (bulk key) by using our cmsg callback */ | |
| 128 if (encd->cmsg->decrypt_key_cb) | |
| 129 bulkkey = (*encd->cmsg->decrypt_key_cb)(encd->cmsg->decrypt_key_cb_arg, | |
| 130 NSS_CMSContentInfo_GetContentEncAlg(cinfo)); | |
| 131 if (bulkkey == NULL) | |
| 132 return SECFailure; | |
| 133 | |
| 134 /* store the bulk key in the contentInfo so that the encoder can find it */ | |
| 135 NSS_CMSContentInfo_SetBulkKey(cinfo, bulkkey); | |
| 136 PK11_FreeSymKey (bulkkey); | |
| 137 | |
| 138 return SECSuccess; | |
| 139 } | |
| 140 | |
| 141 /* | |
| 142 * NSS_CMSEncryptedData_Encode_BeforeData - set up encryption | |
| 143 */ | |
| 144 SECStatus | |
| 145 NSS_CMSEncryptedData_Encode_BeforeData(NSSCMSEncryptedData *encd) | |
| 146 { | |
| 147 NSSCMSContentInfo *cinfo; | |
| 148 PK11SymKey *bulkkey; | |
| 149 SECAlgorithmID *algid; | |
| 150 SECStatus rv; | |
| 151 | |
| 152 cinfo = &(encd->contentInfo); | |
| 153 | |
| 154 /* find bulkkey and algorithm - must have been set by NSS_CMSEncryptedData_Encode_BeforeStart */ | |
| 155 bulkkey = NSS_CMSContentInfo_GetBulkKey(cinfo); | |
| 156 if (bulkkey == NULL) | |
| 157 return SECFailure; | |
| 158 algid = NSS_CMSContentInfo_GetContentEncAlg(cinfo); | |
| 159 if (algid == NULL) | |
| 160 return SECFailure; | |
| 161 | |
| 162 rv = NSS_CMSContentInfo_Private_Init(cinfo); | |
| 163 if (rv != SECSuccess) { | |
| 164 return SECFailure; | |
| 165 } | |
| 166 /* this may modify algid (with IVs generated in a token). | |
| 167 * it is therefore essential that algid is a pointer to the "real" contentEncAlg, | |
| 168 * not just to a copy */ | |
| 169 cinfo->privateInfo->ciphcx = NSS_CMSCipherContext_StartEncrypt(encd->cmsg->poolp, bulkkey, algid); | |
| 170 PK11_FreeSymKey(bulkkey); | |
| 171 if (cinfo->privateInfo->ciphcx == NULL) | |
| 172 return SECFailure; | |
| 173 | |
| 174 return SECSuccess; | |
| 175 } | |
| 176 | |
| 177 /* | |
| 178 * NSS_CMSEncryptedData_Encode_AfterData - finalize this encryptedData for encoding | |
| 179 */ | |
| 180 SECStatus | |
| 181 NSS_CMSEncryptedData_Encode_AfterData(NSSCMSEncryptedData *encd) | |
| 182 { | |
| 183 if (encd->contentInfo.privateInfo && encd->contentInfo.privateInfo->ciphcx) { | |
| 184 NSS_CMSCipherContext_Destroy(encd->contentInfo.privateInfo->ciphcx); | |
| 185 encd->contentInfo.privateInfo->ciphcx = NULL; | |
| 186 } | |
| 187 | |
| 188 /* nothing to do after data */ | |
| 189 return SECSuccess; | |
| 190 } | |
| 191 | |
| 192 | |
| 193 /* | |
| 194 * NSS_CMSEncryptedData_Decode_BeforeData - find bulk key & set up decryption | |
| 195 */ | |
| 196 SECStatus | |
| 197 NSS_CMSEncryptedData_Decode_BeforeData(NSSCMSEncryptedData *encd) | |
| 198 { | |
| 199 PK11SymKey *bulkkey = NULL; | |
| 200 NSSCMSContentInfo *cinfo; | |
| 201 SECAlgorithmID *bulkalg; | |
| 202 SECStatus rv = SECFailure; | |
| 203 | |
| 204 cinfo = &(encd->contentInfo); | |
| 205 | |
| 206 bulkalg = NSS_CMSContentInfo_GetContentEncAlg(cinfo); | |
| 207 | |
| 208 if (encd->cmsg->decrypt_key_cb == NULL) /* no callback? no key../ */ | |
| 209 goto loser; | |
| 210 | |
| 211 bulkkey = (*encd->cmsg->decrypt_key_cb)(encd->cmsg->decrypt_key_cb_arg, bulkalg); | |
| 212 if (bulkkey == NULL) | |
| 213 /* no success finding a bulk key */ | |
| 214 goto loser; | |
| 215 | |
| 216 NSS_CMSContentInfo_SetBulkKey(cinfo, bulkkey); | |
| 217 | |
| 218 rv = NSS_CMSContentInfo_Private_Init(cinfo); | |
| 219 if (rv != SECSuccess) { | |
| 220 goto loser; | |
| 221 } | |
| 222 rv = SECFailure; | |
| 223 | |
| 224 cinfo->privateInfo->ciphcx = NSS_CMSCipherContext_StartDecrypt(bulkkey, bulkalg); | |
| 225 if (cinfo->privateInfo->ciphcx == NULL) | |
| 226 goto loser; /* error has been set by NSS_CMSCipherContext_StartDecrypt */ | |
| 227 | |
| 228 | |
| 229 /* we are done with (this) bulkkey now. */ | |
| 230 PK11_FreeSymKey(bulkkey); | |
| 231 | |
| 232 rv = SECSuccess; | |
| 233 | |
| 234 loser: | |
| 235 return rv; | |
| 236 } | |
| 237 | |
| 238 /* | |
| 239 * NSS_CMSEncryptedData_Decode_AfterData - finish decrypting this encryptedData's content | |
| 240 */ | |
| 241 SECStatus | |
| 242 NSS_CMSEncryptedData_Decode_AfterData(NSSCMSEncryptedData *encd) | |
| 243 { | |
| 244 if (encd->contentInfo.privateInfo && encd->contentInfo.privateInfo->ciphcx) { | |
| 245 NSS_CMSCipherContext_Destroy(encd->contentInfo.privateInfo->ciphcx); | |
| 246 encd->contentInfo.privateInfo->ciphcx = NULL; | |
| 247 } | |
| 248 | |
| 249 return SECSuccess; | |
| 250 } | |
| 251 | |
| 252 /* | |
| 253 * NSS_CMSEncryptedData_Decode_AfterEnd - finish decoding this encryptedData | |
| 254 */ | |
| 255 SECStatus | |
| 256 NSS_CMSEncryptedData_Decode_AfterEnd(NSSCMSEncryptedData *encd) | |
| 257 { | |
| 258 /* apply final touches */ | |
| 259 return SECSuccess; | |
| 260 } |
