OSX/libsecurity_cms/lib/CMSEncoder.h

   1 /*
   2  * Copyright (c) 2006-2012 Apple Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 /*
  25  * CMSEncoder.h - encode, sign, and/or encrypt messages in the Cryptographic
  26  *                                Message Syntax (CMS), per RFC 3852.
  27  *
  28  * A CMS message can be signed, encrypted, or both. A message can be signed by
  29  * an arbitrary number of signers; in this module, signers are expressed as
  30  * SecIdentityRefs. A message can be encrypted for an arbitrary number of
  31  * recipients; recipients are expressed here as SecCertificateRefs.
  32  *
  33  * In CMS terminology, this module performs encryption using the EnvelopedData
  34  * ContentType and signing using the SignedData ContentType.
  35  *
  36  * If the message is both signed and encrypted, it uses "nested ContentInfos"
  37  * in CMS terminology; in this implementation, signed & encrypted messages
  38  * are implemented as an EnvelopedData containing a SignedData.
  39  */
  40
  41 #ifndef _CMS_ENCODER_H_
  42 #define _CMS_ENCODER_H_
  43
  44 #include <CoreFoundation/CoreFoundation.h>
  45 #include <Security/cssmtype.h>
  46 #include <stdint.h>
  47
  48 #ifdef __cplusplus
  49 extern "C" {
  50 #endif
  51
  52 CF_ASSUME_NONNULL_BEGIN
  53
  54 /*
  55  * Opaque reference to a CMS encoder object.
  56  * This is a CF object, with standard CF semantics; dispose of it
  57  * with CFRelease().
  58  */
  59 typedef struct CF_BRIDGED_TYPE(id) _CMSEncoder *CMSEncoderRef;
  60
  61 CFTypeID CMSEncoderGetTypeID(void)
  62     __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_NA);
  63
  64 /*
  65  * Create a CMSEncoder. Result must eventually be freed via CFRelease().
  66  */
  67 OSStatus CMSEncoderCreate(
  68         CMSEncoderRef * __nonnull CF_RETURNS_RETAINED cmsEncoderOut)    /* RETURNED */
  69         __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_NA);
  70
  71 extern const CFStringRef kCMSEncoderDigestAlgorithmSHA1;
  72 extern const CFStringRef kCMSEncoderDigestAlgorithmSHA256;
  73
  74 OSStatus CMSEncoderSetSignerAlgorithm(
  75         CMSEncoderRef           cmsEncoder,
  76         CFStringRef             digestAlgorithm)
  77     __OSX_AVAILABLE_STARTING(__MAC_10_11, __IPHONE_NA);
  78
  79 /*
  80  * Specify signers of the CMS message; implies that the message will be signed.
  81  *
  82  * -- Caller can pass in one signer, as a SecIdentityRef, or an array of
  83  *    signers, as a CFArray of SecIdentityRefs.
  84  * -- Can be called multiple times.
  85  * -- If the message is not to be signed, don't call this.
  86  * -- If this is called, it must be called before the first call to
  87  *    CMSEncoderUpdateContent().
  88  */
  89 OSStatus CMSEncoderAddSigners(
  90         CMSEncoderRef           cmsEncoder,
  91         CFTypeRef                       signerOrArray)
  92     __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_NA);
  93
  94 /*
  95  * Obtain an array of signers as specified in CMSEncoderSetSigners().
  96  * Returns a NULL signers array if CMSEncoderSetSigners() has not been called.
  97  * Caller must CFRelease the result.
  98  */
  99 OSStatus CMSEncoderCopySigners(
 100         CMSEncoderRef           cmsEncoder,
 101         CFArrayRef * __nonnull CF_RETURNS_RETAINED signersOut)          /* RETURNED */
 102     __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_NA);
 103
 104 /*
 105  * Specify recipients of the message. Implies that the message will
 106  * be encrypted.
 107  *
 108  * -- Caller can pass in one recipient, as a SecCertificateRef, or an
 109  *    array of recipients, as a CFArray of SecCertificateRefs.
 110  * -- Can be called multiple times.
 111  * -- If the message is not to be encrypted, don't call this.
 112  * -- If this is called, it must be called before the first call to
 113  *    CMSEncoderUpdateContent().
 114  */
 115 OSStatus CMSEncoderAddRecipients(
 116         CMSEncoderRef           cmsEncoder,
 117         CFTypeRef                       recipientOrArray)
 118     __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_NA);
 119
 120 /*
 121  * Obtain an array of recipients as specified in CMSEncoderSetRecipients().
 122  * Returns a NULL recipients array if CMSEncoderSetRecipients() has not been
 123  * called.
 124  * Caller must CFRelease the result.
 125  */
 126 OSStatus CMSEncoderCopyRecipients(
 127         CMSEncoderRef           cmsEncoder,
 128         CFArrayRef * __nonnull CF_RETURNS_RETAINED recipientsOut)       /* RETURNED */
 129     __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_NA);
 130
 131 /*
 132  * A signed message optionally includes the data to be signed. If the message
 133  * is *not* to include the data to be signed, call this function with a value
 134  * of TRUE for detachedContent. The default, if this function is not called,
 135  * is detachedContent=FALSE, i.e., the message contains the data to be signed.
 136  *
 137  * -- Encrypted messages can not use detached content. (This restriction
 138  *    also applies to messages that are both signed and encrypted.)
 139  * -- If this is called, it must be called before the first call to
 140  *    CMSEncoderUpdateContent().
 141  */
 142 OSStatus CMSEncoderSetHasDetachedContent(
 143         CMSEncoderRef           cmsEncoder,
 144         Boolean                 detachedContent)
 145     __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_NA);
 146
 147 /*
 148  * Obtain a Boolean indicating whether the current message will have detached
 149  * content.
 150  * Returns the value specified in CMSEncoderHasDetachedContent() if that
 151  * function has been called; else returns the default FALSE.
 152  */
 153 OSStatus CMSEncoderGetHasDetachedContent(
 154         CMSEncoderRef           cmsEncoder,
 155         Boolean                 *detachedContentOut)    /* RETURNED */
 156     __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_NA);
 157
 158 /*
 159  * Optionally specify an eContentType OID for the inner EncapsulatedData for
 160  * a signed message. The default eContentType, used if this function is not
 161  * called, is id-data (which is the normal eContentType for applications such
 162  * as SMIME).
 163  *
 164  * If this is called, it must be called before the first call to
 165  * CMSEncoderUpdateContent().
 166  *
 167  * NOTE: This function is deprecated in Mac OS X 10.7 and later;
 168  * please use CMSEncoderSetEncapsulatedContentTypeOID() instead.
 169  */
 170 OSStatus CMSEncoderSetEncapsulatedContentType(
 171         CMSEncoderRef           cmsEncoder,
 172         const CSSM_OID  *eContentType)
 173         /* DEPRECATED_IN_MAC_OS_X_VERSION_10_7_AND_LATER; */
 174     __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_NA);
 175
 176 /*
 177  * Optionally specify an eContentType OID for the inner EncapsulatedData for
 178  * a signed message. The default eContentTypeOID, used if this function is not
 179  * called, is id-data (which is the normal eContentType for applications such
 180  * as SMIME).
 181  *
 182  * The eContentTypeOID parameter may be specified as a CF string, e.g.:
 183  * CFSTR("1.2.840.113549.1.7.1")
 184  *
 185  * If this is called, it must be called before the first call to
 186  * CMSEncoderUpdateContent().
 187  */
 188 OSStatus CMSEncoderSetEncapsulatedContentTypeOID(
 189         CMSEncoderRef           cmsEncoder,
 190         CFTypeRef                       eContentTypeOID)
 191     __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_NA);
 192
 193 /*
 194  * Obtain the eContentType OID specified in CMSEncoderSetEncapsulatedContentType().
 195  * If CMSEncoderSetEncapsulatedContentType() has not been called this returns a
 196  * NULL pointer.
 197  * The returned OID's data is in the same format as the data provided to
 198  * CMSEncoderSetEncapsulatedContentType;, i.e., it's the encoded content of
 199  * the OID, not including the tag and length bytes.
 200  */
 201 OSStatus CMSEncoderCopyEncapsulatedContentType(
 202         CMSEncoderRef           cmsEncoder,
 203         CFDataRef * __nonnull CF_RETURNS_RETAINED eContentTypeOut)              /* RETURNED */
 204     __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_NA);
 205
 206 /*
 207  * Signed CMS messages can contain arbitrary sets of certificates beyond those
 208  * indicating the identity of the signer(s). This function provides a means of
 209  * adding these other certs. For normal signed messages it is not necessary to
 210  * call this; the signer cert(s) and the intermediate certs needed to verify the
 211  * signer(s) will be included in the message implicitly.
 212  *
 213  * -- Caller can pass in one cert, as a SecCertificateRef, or an array of certs,
 214  *    as a CFArray of SecCertificateRefs.
 215  * -- If this is called, it must be called before the first call to
 216  *    CMSEncoderUpdateContent().
 217  * -- There is a "special case" use of CMS messages which involves neither
 218  *    signing nor encryption, but does include certificates. This is commonly
 219  *    used to transport "bags" of certificates. When constructing such a
 220  *    message, all an application needs to do is to create a CMSEncoderRef,
 221  *    call CMSEncoderAddSupportingCerts() one or more times, and then call
 222  *    CMSEncoderCopyEncodedContent() to get the resulting cert bag. No 'content'
 223  *    need be specified. (This is in fact the primary intended use for
 224  *    this function.)
 225  */
 226 OSStatus CMSEncoderAddSupportingCerts(
 227         CMSEncoderRef           cmsEncoder,
 228         CFTypeRef                       certOrArray)
 229     __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_NA);
 230
 231 /*
 232  * Obtain the SecCertificates provided in CMSEncoderAddSupportingCerts().
 233  * If CMSEncoderAddSupportingCerts() has not been called this will return a
 234  * NULL value for *certs.
 235  * Caller must CFRelease the result.
 236  */
 237 OSStatus CMSEncoderCopySupportingCerts(
 238         CMSEncoderRef           cmsEncoder,
 239         CFArrayRef * __nonnull CF_RETURNS_RETAINED certsOut)                    /* RETURNED */
 240     __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_NA);
 241
 242 /*
 243  * Standard signed attributes, optionally specified in
 244  * CMSEncoderAddSignedAttributes().
 245  */
 246 typedef CF_ENUM(uint32_t, CMSSignedAttributes) {
 247         kCMSAttrNone                                            = 0x0000,
 248     /*
 249      * S/MIME Capabilities - identifies supported signature, encryption, and
 250      * digest algorithms.
 251      */
 252     kCMSAttrSmimeCapabilities                   = 0x0001,
 253     /*
 254      * Indicates that a cert is the preferred cert for S/MIME encryption.
 255      */
 256     kCMSAttrSmimeEncryptionKeyPrefs             = 0x0002,
 257     /*
 258      * Same as kCMSSmimeEncryptionKeyPrefs, using an attribute OID preferred
 259      * by Microsoft.
 260      */
 261     kCMSAttrSmimeMSEncryptionKeyPrefs   = 0x0004,
 262     /*
 263      * Include the signing time.
 264      */
 265     kCMSAttrSigningTime                                 = 0x0008
 266 };
 267
 268 /*
 269  * Optionally specify signed attributes. Only meaningful when creating a
 270  * signed message. If this is called, it must be called before
 271  * CMSEncoderUpdateContent().
 272  */
 273 OSStatus CMSEncoderAddSignedAttributes(
 274         CMSEncoderRef           cmsEncoder,
 275         CMSSignedAttributes     signedAttributes)
 276     __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_NA);
 277
 278 /*
 279  * Specification of what certificates to include in a signed message.
 280  */
 281 typedef CF_ENUM(uint32_t, CMSCertificateChainMode) {
 282         kCMSCertificateNone = 0,                /* don't include any certificates */
 283         kCMSCertificateSignerOnly,              /* only include signer certificate(s) */
 284         kCMSCertificateChain,                   /* signer certificate chain up to but not
 285                                                                          *   including root certiticate */
 286         kCMSCertificateChainWithRoot    /* signer certificate chain including root */
 287 };
 288
 289 /*
 290  * Optionally specify which certificates, if any, to include in a
 291  * signed CMS message. The default, if this is not called, is
 292  * kCMSCertificateChain, in which case the signer cert plus all CA
 293  * certs needed to verify the signer cert, except for the root
 294  * cert, are included.
 295  * If this is called, it must be called before
 296  * CMSEncoderUpdateContent().
 297  */
 298 OSStatus CMSEncoderSetCertificateChainMode(
 299         CMSEncoderRef                   cmsEncoder,
 300         CMSCertificateChainMode chainMode)
 301     __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_NA);
 302
 303 /*
 304  * Obtain indication of which signer certs are to be included
 305  * in a signed CMS message.
 306  */
 307 OSStatus CMSEncoderGetCertificateChainMode(
 308         CMSEncoderRef                   cmsEncoder,
 309         CMSCertificateChainMode *chainModeOut)
 310     __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_NA);
 311
 312 /*
 313  * Feed content bytes into the encoder.
 314  * Can be called multiple times.
 315  * No 'setter' routines can be called after this function has been called.
 316  */
 317 OSStatus CMSEncoderUpdateContent(
 318         CMSEncoderRef           cmsEncoder,
 319         const void                      *content,
 320         size_t                          contentLen)
 321     __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_NA);
 322
 323 /*
 324  * Finish encoding the message and obtain the encoded result.
 325  * Caller must CFRelease the result.
 326  */
 327 OSStatus CMSEncoderCopyEncodedContent(
 328         CMSEncoderRef           cmsEncoder,
 329         CFDataRef * __nonnull CF_RETURNS_RETAINED encodedContentOut)    /* RETURNED */
 330     __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_NA);
 331
 332 /*
 333  * High-level, one-shot encoder function.
 334  *
 335  * Inputs (all except for content optional, though at least one
 336  *         of {signers, recipients} must be non-NULL)
 337  * ------------------------------------------------------------
 338  * signers          : signer identities. Either a SecIdentityRef, or a
 339  *                    CFArray of them.
 340  * recipients       : recipient certificates. Either a SecCertificateRef,
 341  *                    or a CFArray of them.
 342  * eContentType     : contentType for inner EncapsulatedData.
 343  * detachedContent  : when true, do not include the signed data in the message.
 344  * signedAttributes : Specifies which standard signed attributes are to be
 345  *                    included in the message.
 346  * content          : raw content to be signed and/or encrypted.
 347  *
 348  * Output
 349  * ------
 350  * encodedContent   : the result of the encoding.
 351  *
 352  * NOTE: This function is deprecated in Mac OS X 10.7 and later;
 353  * please use CMSEncodeContent() instead.
 354  */
 355 OSStatus CMSEncode(
 356         CFTypeRef __nullable        signers,
 357         CFTypeRef __nullable        recipients,
 358         const CSSM_OID * __nullable eContentType,
 359         Boolean                     detachedContent,
 360         CMSSignedAttributes         signedAttributes,
 361         const void *                content,
 362         size_t                      contentLen,
 363         CFDataRef * __nonnull CF_RETURNS_RETAINED encodedContentOut)    /* RETURNED */
 364         /* DEPRECATED_IN_MAC_OS_X_VERSION_10_7_AND_LATER; */
 365     __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_NA);
 366
 367
 368 /*
 369  * High-level, one-shot encoder function.
 370  *
 371  * Inputs (all except for content optional, though at least one
 372  *         of {signers, recipients} must be non-NULL)
 373  * ------------------------------------------------------------
 374  * signers          : signer identities. Either a SecIdentityRef, or a
 375  *                    CFArray of them.
 376  * recipients       : recipient certificates. Either a SecCertificateRef,
 377  *                    or a CFArray of them.
 378  * eContentTypeOID  : contentType OID for inner EncapsulatedData, e.g.:
 379  *                    CFSTR("1.2.840.113549.1.7.1")
 380  * detachedContent  : when true, do not include the signed data in the message.
 381  * signedAttributes : Specifies which standard signed attributes are to be
 382  *                    included in the message.
 383  * content          : raw content to be signed and/or encrypted.
 384  *
 385  * Output
 386  * ------
 387  * encodedContent   : the result of the encoding.
 388  */
 389 OSStatus CMSEncodeContent(
 390         CFTypeRef __nullable    signers,
 391         CFTypeRef __nullable    recipients,
 392         CFTypeRef __nullable    eContentTypeOID,
 393         Boolean                 detachedContent,
 394         CMSSignedAttributes     signedAttributes,
 395         const void              *content,
 396         size_t                  contentLen,
 397         CFDataRef * __nullable CF_RETURNS_RETAINED encodedContentOut)   /* RETURNED */
 398     __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_NA);
 399
 400 OSStatus CMSEncoderCopySignerTimestamp(
 401         CMSEncoderRef           cmsEncoder,
 402         size_t                          signerIndex,        /* usually 0 */
 403         CFAbsoluteTime      *timestamp)                 /* RETURNED */
 404     __OSX_AVAILABLE_STARTING(__MAC_10_8, __IPHONE_NA);
 405
 406 OSStatus CMSEncoderCopySignerTimestampWithPolicy(
 407     CMSEncoderRef           cmsEncoder,
 408     CFTypeRef __nullable    timeStampPolicy,
 409     size_t                  signerIndex,        /* usually 0 */
 410     CFAbsoluteTime          *timestamp)                 /* RETURNED */
 411     __OSX_AVAILABLE_STARTING(__MAC_10_10, __IPHONE_NA);
 412
 413 CF_ASSUME_NONNULL_END
 414
 415 #ifdef __cplusplus
 416 }
 417 #endif
 418
 419 #endif  /* _CMS_ENCODER_H_ */
 420