libsecurity_keychain/lib/SecKey.h

   1 /*
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   6  * This file contains Original Code and/or Modifications of Original Code
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   8  * Version 2.0 (the 'License'). You may not use this file except in
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  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
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  23
  24 /*!
  25         @header SecKey
  26         The functions provided in SecKey.h implement and manage a particular
  27     type of keychain item that represents a key.  A key can be stored in a
  28     keychain, but a key can also be a transient object.
  29
  30         You can use a key as a keychain item in most functions.
  31 */
  32
  33 #ifndef _SECURITY_SECKEY_H_
  34 #define _SECURITY_SECKEY_H_
  35
  36 #include <dispatch/dispatch.h>
  37 #include <Security/SecBase.h>
  38 #include <Security/SecAccess.h>
  39 #include <Security/cssmtype.h>
  40 #include <CoreFoundation/CFDictionary.h>
  41 #include <sys/types.h>
  42
  43 #if defined(__cplusplus)
  44 extern "C" {
  45 #endif
  46
  47 /*!
  48         @enum KeyItemAttributeConstants
  49         @abstract Specifies keychain item attributes for keys.
  50     @constant kSecKeyKeyClass type uint32 (CSSM_KEYCLASS), value
  51     is one of CSSM_KEYCLASS_PUBLIC_KEY, CSSM_KEYCLASS_PRIVATE_KEY
  52     or CSSM_KEYCLASS_SESSION_KEY.
  53     @constant kSecKeyPrintName type blob, human readable name of
  54     the key.  Same as kSecLabelItemAttr for normal keychain items.
  55     @constant kSecKeyAlias type blob, currently unused.
  56     @constant kSecKeyPermanent type uint32, value is nonzero iff
  57     this key is permanent (stored in some keychain).  This is always
  58     1.
  59     @constant kSecKeyPrivate type uint32, value is nonzero iff this
  60     key is protected by a user login or a password, or both.
  61     @constant kSecKeyModifiable type uint32, value is nonzero iff
  62     attributes of this key can be modified.
  63     @constant kSecKeyLabel type blob, for private and public keys
  64     this contains the hash of the public key.  This is used to
  65     associate certificates and keys.  Its value matches the value
  66     of the kSecPublicKeyHashItemAttr of a certificate and it's used
  67     to construct an identity from a certificate and a key.
  68     For symmetric keys this is whatever the creator of the key
  69     passed in during the generate key call.
  70     @constant kSecKeyApplicationTag type blob, currently unused.
  71     @constant kSecKeyKeyCreator type data, the data points to a
  72     CSSM_GUID structure representing the moduleid of the csp owning
  73     this key.
  74     @constant kSecKeyKeyType type uint32, value is a CSSM_ALGORITHMS
  75     representing the algorithm associated with this key.
  76     @constant kSecKeyKeySizeInBits type uint32, value is the number
  77     of bits in this key.
  78     @constant kSecKeyEffectiveKeySize type uint32, value is the
  79     effective number of bits in this key.  For example a des key
  80     has a kSecKeyKeySizeInBits of 64 but a kSecKeyEffectiveKeySize
  81     of 56.
  82     @constant kSecKeyStartDate type CSSM_DATE.  Earliest date from
  83     which this key may be used.  If the value is all zeros or not
  84     present, no restriction applies.
  85     @constant kSecKeyEndDate type CSSM_DATE.  Latest date at
  86     which this key may be used.  If the value is all zeros or not
  87     present, no restriction applies.
  88     @constant kSecKeySensitive type uint32, iff value is nonzero
  89     this key cannot be wrapped with CSSM_ALGID_NONE.
  90     @constant kSecKeyAlwaysSensitive type uint32, value is nonzero
  91     iff this key has always been marked sensitive.
  92     @constant kSecKeyExtractable type uint32, value is nonzero iff
  93     this key can be wrapped.
  94     @constant kSecKeyNeverExtractable type uint32, value is nonzero
  95     iff this key was never marked extractable.
  96     @constant kSecKeyEncrypt type uint32, value is nonzero iff this
  97     key can be used in an encrypt operation.
  98     @constant kSecKeyDecrypt type uint32, value is nonzero iff this
  99     key can be used in a decrypt operation.
 100     @constant kSecKeyDerive type uint32, value is nonzero iff this
 101     key can be used in a deriveKey operation.
 102     @constant kSecKeySign type uint32, value is nonzero iff this
 103     key can be used in a sign operation.
 104     @constant kSecKeyVerify type uint32, value is nonzero iff this
 105     key can be used in a verify operation.
 106     @constant kSecKeySignRecover type uint32.
 107     @constant kSecKeyVerifyRecover type uint32.
 108     key can unwrap other keys.
 109     @constant kSecKeyWrap type uint32, value is nonzero iff this
 110     key can wrap other keys.
 111     @constant kSecKeyUnwrap type uint32, value is nonzero iff this
 112     key can unwrap other keys.
 113         @discussion
 114         The use of these enumerations has been deprecated.  Please
 115         use the equivalent items defined in SecItem.h
 116         @@@.
 117 */
 118 enum
 119 {
 120     kSecKeyKeyClass =          0,
 121     kSecKeyPrintName =         1,
 122     kSecKeyAlias =             2,
 123     kSecKeyPermanent =         3,
 124     kSecKeyPrivate =           4,
 125     kSecKeyModifiable =        5,
 126     kSecKeyLabel =             6,
 127     kSecKeyApplicationTag =    7,
 128     kSecKeyKeyCreator =        8,
 129     kSecKeyKeyType =           9,
 130     kSecKeyKeySizeInBits =    10,
 131     kSecKeyEffectiveKeySize = 11,
 132     kSecKeyStartDate =        12,
 133     kSecKeyEndDate =          13,
 134     kSecKeySensitive =        14,
 135     kSecKeyAlwaysSensitive =  15,
 136     kSecKeyExtractable =      16,
 137     kSecKeyNeverExtractable = 17,
 138     kSecKeyEncrypt =          18,
 139     kSecKeyDecrypt =          19,
 140     kSecKeyDerive =           20,
 141     kSecKeySign =             21,
 142     kSecKeyVerify =           22,
 143     kSecKeySignRecover =      23,
 144     kSecKeyVerifyRecover =    24,
 145     kSecKeyWrap =             25,
 146     kSecKeyUnwrap =           26
 147 };
 148
 149 /*!
 150     @typedef SecCredentialType
 151     @abstract Determines the type of credential returned by SecKeyGetCredentials.
 152 */
 153 typedef uint32 SecCredentialType;
 154
 155 /*!
 156     @enum SecCredentialType
 157     @abstract Determines the type of credential returned by SecKeyGetCredentials.
 158     @constant kSecCredentialTypeWithUI Operations with this key are allowed to present UI if required.
 159     @constant kSecCredentialTypeNoUI Operations with this key are not allowed to present UI, and will fail if UI is required.
 160     @constant kSecCredentialTypeDefault The default setting for determining whether to present UI is used. This setting can be changed with a call to SecKeychainSetUserInteractionAllowed.
 161 */
 162 enum
 163 {
 164         kSecCredentialTypeDefault = 0,
 165         kSecCredentialTypeWithUI,
 166         kSecCredentialTypeNoUI
 167 };
 168
 169 /*!
 170     @typedef SecPadding
 171     @abstract Supported padding types.
 172 */
 173 typedef uint32_t SecPadding;
 174 enum
 175 {
 176     kSecPaddingNone      = 0,
 177     kSecPaddingPKCS1     = 1,
 178
 179     /* For SecKeyRawSign/SecKeyRawVerify only, data to be signed is an MD2
 180        hash; standard ASN.1 padding will be done, as well as PKCS1 padding
 181        of the underlying RSA operation. */
 182     kSecPaddingPKCS1MD2  = 0x8000,
 183
 184     /* For SecKeyRawSign/SecKeyRawVerify only, data to be signed is an MD5
 185        hash; standard ASN.1 padding will be done, as well as PKCS1 padding
 186        of the underlying RSA operation. */
 187     kSecPaddingPKCS1MD5  = 0x8001,
 188
 189     /* For SecKeyRawSign/SecKeyRawVerify only, data to be signed is a SHA1
 190        hash; standard ASN.1 padding will be done, as well as PKCS1 padding
 191        of the underlying RSA operation. */
 192     kSecPaddingPKCS1SHA1 = 0x8002,
 193 };
 194
 195 /*!
 196     @typedef SecKeySizes
 197     @abstract Supported key lengths.
 198 */
 199 typedef uint32_t SecKeySizes;
 200 enum
 201 {
 202     kSecDefaultKeySize  = 0,
 203
 204     // Symmetric Keysizes - default is currently kSecAES128 for AES.
 205     kSec3DES192         = 192,
 206     kSecAES128          = 128,
 207     kSecAES192          = 192,
 208     kSecAES256          = 256,
 209
 210     // Supported ECC Keys for Suite-B from RFC 4492 section 5.1.1.
 211     // default is currently kSecp256r1
 212     kSecp192r1          = 192,
 213     kSecp256r1          = 256,
 214     kSecp384r1          = 384,
 215     kSecp521r1          = 521,  // Yes, 521
 216
 217     // Boundaries for RSA KeySizes - default is currently 2048
 218                 // RSA keysizes must be multiples of 8
 219     kSecRSAMin          = 1024,
 220     kSecRSAMax          = 4096
 221 };
 222
 223
 224 /*!
 225         @function SecKeyGetTypeID
 226         @abstract Returns the type identifier of SecKey instances.
 227         @result The CFTypeID of SecKey instances.
 228 */
 229 CFTypeID SecKeyGetTypeID(void)
 230         __OSX_AVAILABLE_STARTING(__MAC_10_3, __IPHONE_2_0);
 231
 232 /*!
 233         @function SecKeyCreatePair
 234         @abstract Creates an asymmetric key pair and stores it in a specified keychain.
 235         @param keychainRef A reference to the keychain in which to store the private and public key items. Specify NULL for the default keychain.
 236     @param algorithm An algorithm for the key pair. This parameter is ignored if a valid (non-zero) contextHandle is supplied.
 237     @param keySizeInBits A key size for the key pair. This parameter is ignored if a valid (non-zero) contextHandle is supplied.
 238         @param contextHandle (optional) A CSSM_CC_HANDLE, or 0. If this argument is supplied, the algorithm and keySizeInBits parameters are ignored. If extra parameters are needed to generate a key (some algorithms require this), you should create a context using CSSM_CSP_CreateKeyGenContext, using the CSPHandle obtained by calling SecKeychainGetCSPHandle. Then use CSSM_UpdateContextAttributes to add parameters, and dispose of the context using CSSM_DeleteContext after calling this function.
 239         @param publicKeyUsage A bit mask indicating all permitted uses for the new public key. CSSM_KEYUSE bit mask values are defined in cssmtype.h.
 240     @param publicKeyAttr A bit mask defining attribute values for the new public key. The bit mask values are equivalent to a CSSM_KEYATTR_FLAGS and are defined in cssmtype.h.
 241     @param privateKeyUsage A bit mask indicating all permitted uses for the new private key. CSSM_KEYUSE bit mask values are defined in cssmtype.h.
 242     @param privateKeyAttr A bit mask defining attribute values for the new private key. The bit mask values are equivalent to a CSSM_KEYATTR_FLAGS and are defined in cssmtype.h.
 243     @param initialAccess (optional) A SecAccess object that determines the initial access rights to the private key. The public key is given "any/any" access rights by default.
 244     @param publicKey (optional) On return, the keychain item reference of the generated public key. Use the SecKeyGetCSSMKey function to obtain the CSSM_KEY. The caller must call CFRelease on this value if it is returned. Pass NULL if a reference to this key is not required.
 245     @param privateKey (optional) On return, the keychain item reference of the generated private key. Use the SecKeyGetCSSMKey function to obtain the CSSM_KEY. The caller must call CFRelease on this value if it is returned. Pass NULL if a reference to this key is not required.
 246         @result A result code. See "Security Error Codes" (SecBase.h).
 247         @discussion This API is deprecated for 10.7 Plese use the SecKeyGeneratePair API
 248 */
 249 OSStatus SecKeyCreatePair(
 250         SecKeychainRef keychainRef,
 251         CSSM_ALGORITHMS algorithm,
 252         uint32 keySizeInBits,
 253         CSSM_CC_HANDLE contextHandle,
 254         CSSM_KEYUSE publicKeyUsage,
 255         uint32 publicKeyAttr,
 256         CSSM_KEYUSE privateKeyUsage,
 257         uint32 privateKeyAttr,
 258         SecAccessRef initialAccess,
 259         SecKeyRef* publicKey,
 260         SecKeyRef* privateKey)
 261                 DEPRECATED_IN_MAC_OS_X_VERSION_10_7_AND_LATER;
 262
 263 /*!
 264         @function SecKeyGenerate
 265         @abstract Creates a symmetric key and optionally stores it in a specified keychain.
 266         @param keychainRef (optional) A reference to the keychain in which to store the generated key. Specify NULL to generate a transient key.
 267     @param algorithm An algorithm for the symmetric key. This parameter is ignored if a valid (non-zero) contextHandle is supplied.
 268     @param keySizeInBits A key size for the key pair. This parameter is ignored if a valid (non-zero) contextHandle is supplied.
 269         @param contextHandle (optional) A CSSM_CC_HANDLE, or 0. If this argument is supplied, the algorithm and keySizeInBits parameters are ignored. If extra parameters are needed to generate a key (some algorithms require this), you should create a context using CSSM_CSP_CreateKeyGenContext, using the CSPHandle obtained by calling SecKeychainGetCSPHandle. Then use CSSM_UpdateContextAttributes to add parameters, and dispose of the context using CSSM_DeleteContext after calling this function.
 270         @param keyUsage A bit mask indicating all permitted uses for the new key. CSSM_KEYUSE bit mask values are defined in cssmtype.h.
 271     @param keyAttr A bit mask defining attribute values for the new key. The bit mask values are equivalent to a CSSM_KEYATTR_FLAGS and are defined in cssmtype.h.
 272     @param initialAccess (optional) A SecAccess object that determines the initial access rights for the key. This parameter is ignored if the keychainRef is NULL.
 273     @param keyRef On return, a reference to the generated key. Use the SecKeyGetCSSMKey function to obtain the CSSM_KEY. The caller must call CFRelease on this value if it is returned.
 274         @result A result code.  See "Security Error Codes" (SecBase.h).
 275         @discussion This API is deprecated for 10.7.  Plese use the SecKeyGenerateSymmetric API
 276 */
 277 OSStatus SecKeyGenerate(
 278         SecKeychainRef keychainRef,
 279         CSSM_ALGORITHMS algorithm,
 280         uint32 keySizeInBits,
 281         CSSM_CC_HANDLE contextHandle,
 282         CSSM_KEYUSE keyUsage,
 283         uint32 keyAttr,
 284         SecAccessRef initialAccess,
 285         SecKeyRef* keyRef)
 286                 DEPRECATED_IN_MAC_OS_X_VERSION_10_7_AND_LATER;
 287
 288 /*!
 289     @function SecKeyGetCSSMKey
 290     @abstract Returns a pointer to the CSSM_KEY for the given key item reference.
 291     @param key A keychain key item reference. The key item must be of class type kSecPublicKeyItemClass, kSecPrivateKeyItemClass, or kSecSymmetricKeyItemClass.
 292     @param cssmKey On return, a pointer to a CSSM_KEY structure for the given key. This pointer remains valid until the key reference is released. The caller should not attempt to modify or free this data.
 293     @result A result code. See "Security Error Codes" (SecBase.h).
 294     @discussion  The CSSM_KEY is valid until the key item reference is released. This API is deprecated in 10.7. Its use should no longer be needed.
 295 */
 296 OSStatus SecKeyGetCSSMKey(SecKeyRef key, const CSSM_KEY **cssmKey)
 297         DEPRECATED_IN_MAC_OS_X_VERSION_10_7_AND_LATER;;
 298
 299 /*!
 300     @function SecKeyGetCSPHandle
 301     @abstract Returns the CSSM_CSP_HANDLE for the given key reference. The handle is valid until the key reference is released.
 302     @param keyRef A key reference.
 303     @param cspHandle On return, the CSSM_CSP_HANDLE for the given keychain.
 304     @result A result code. See "Security Error Codes" (SecBase.h).
 305         @discussion This API is deprecated in 10.7. Its use should no longer be needed.
 306 */
 307 OSStatus SecKeyGetCSPHandle(SecKeyRef keyRef, CSSM_CSP_HANDLE *cspHandle)
 308         DEPRECATED_IN_MAC_OS_X_VERSION_10_7_AND_LATER;
 309
 310 /*!
 311     @function SecKeyGetCredentials
 312     @abstract For a given key, return a pointer to a CSSM_ACCESS_CREDENTIALS structure which will allow the key to be used.
 313     @param keyRef The key for which a credential is requested.
 314     @param operation The type of operation to be performed with this key. See "Authorization tag type" for defined operations (cssmtype.h).
 315     @param credentialType The type of credential requested.
 316     @param outCredentials On return, a pointer to a CSSM_ACCESS_CREDENTIALS structure. This pointer remains valid until the key reference is released. The caller should not attempt to modify or free this data.
 317     @result A result code. See "Security Error Codes" (SecBase.h).
 318 */
 319 OSStatus SecKeyGetCredentials(
 320         SecKeyRef keyRef,
 321         CSSM_ACL_AUTHORIZATION_TAG operation,
 322         SecCredentialType credentialType,
 323         const CSSM_ACCESS_CREDENTIALS **outCredentials)
 324                 DEPRECATED_IN_MAC_OS_X_VERSION_10_7_AND_LATER;
 325
 326 /*!
 327     @function SecKeyGetBlockSize
 328     @abstract Decrypt a block of ciphertext.
 329     @param key The key for which the block length is requested.
 330     @result The block length of the key in bytes.
 331     @discussion If for example key is an RSA key the value returned by
 332     this function is the size of the modulus.
 333  */
 334 size_t SecKeyGetBlockSize(SecKeyRef key)
 335         __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0);
 336
 337 /*!
 338  @function      SecKeyGenerateSymmetric
 339  @abstract      Generates a random symmetric key with the specified length
 340  and algorithm type.
 341
 342  @param parameters A dictionary containing one or more key-value pairs.
 343  See the discussion sections below for a complete overview of options.
 344  @param error An optional pointer to a CFErrorRef. This value is set
 345  if an error occurred. If not NULL, the caller is responsible for
 346  releasing the CFErrorRef.
 347  @result On return, a SecKeyRef reference to the symmetric key, or
 348  NULL if the key could not be created.
 349
 350  @discussion In order to generate a symmetric key, the parameters dictionary
 351  must at least contain the following keys:
 352
 353  * kSecAttrKeyType with a value of kSecAttrKeyTypeAES or any other
 354  kSecAttrKeyType defined in SecItem.h
 355  * kSecAttrKeySizeInBits with a value being a CFNumberRef containing
 356  the requested key size in bits.  Example sizes for AES keys are:
 357  128, 192, 256, 512.
 358
 359  To store the generated symmetric key in a keychain, set these keys:
 360  * kSecUseKeychain (value is a SecKeychainRef)
 361  * kSecAttrLabel (a user-visible label whose value is a CFStringRef,
 362  e.g. "My App's Encryption Key")
 363  * kSecAttrApplicationLabel (a label defined by your application, whose
 364  value is a CFStringRef and which can be used to find this key in a
 365  subsequent call to SecItemCopyMatching, e.g. "ID-1234567890-9876-0151")
 366
 367  To specify the generated key's access control settings, set this key:
 368  * kSecAttrAccess (value is a SecAccessRef)
 369
 370  The keys below may be optionally set in the parameters dictionary
 371  (with a CFBooleanRef value) to override the default usage values:
 372
 373  * kSecAttrCanEncrypt (defaults to true if not explicitly specified)
 374  * kSecAttrCanDecrypt (defaults to true if not explicitly specified)
 375  * kSecAttrCanWrap (defaults to true if not explicitly specified)
 376  * kSecAttrCanUnwrap (defaults to true if not explicitly specified)
 377
 378 */
 379 SecKeyRef SecKeyGenerateSymmetric(CFDictionaryRef parameters, CFErrorRef *error)
 380         __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_NA);
 381
 382
 383 /*!
 384  @function      SecKeyCreateFromData
 385  @abstract      Creates a symmetric key with the given data and sets the
 386  algorithm type specified.
 387
 388  @param parameters A dictionary containing one or more key-value pairs.
 389  See the discussion sections below for a complete overview of options.
 390  @result On return, a SecKeyRef reference to the symmetric key.
 391
 392  @discussion In order to generate a symmetric key the parameters dictionary must
 393  at least contain the following keys:
 394
 395  * kSecAttrKeyType with a value of kSecAttrKeyTypeAES or any other
 396  kSecAttrKeyType defined in SecItem.h
 397
 398  The keys below may be optionally set in the parameters dictionary
 399  (with a CFBooleanRef value) to override the default usage values:
 400
 401  * kSecAttrCanEncrypt (defaults to true if not explicitly specified)
 402  * kSecAttrCanDecrypt (defaults to true if not explicitly specified)
 403  * kSecAttrCanWrap (defaults to true if not explicitly specified)
 404  * kSecAttrCanUnwrap (defaults to true if not explicitly specified)
 405
 406 */
 407 SecKeyRef SecKeyCreateFromData(CFDictionaryRef parameters,
 408         CFDataRef keyData, CFErrorRef *error)
 409         __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_NA);
 410
 411
 412 /*!
 413  @function SecKeyGeneratePair
 414  @abstract Generate a private/public keypair.
 415  @param parameters A dictionary containing one or more key-value pairs.
 416  @result A result code. See "Security Error Codes" (SecBase.h). On success,
 417  the result code will be errSecSuccess, and the output parameters will
 418  contain the public SecKeyRef and private SecKeyRef. It is the caller's
 419  responsibility to CFRelease these key references when finished with them.
 420
 421  @discussion In order to generate a keypair the parameters dictionary must
 422  at least contain the following keys:
 423
 424  * kSecAttrKeyType with a value of kSecAttrKeyTypeRSA or any other
 425  kSecAttrKeyType defined in SecItem.h
 426  * kSecAttrKeySizeInBits with a value being a CFNumberRef containing
 427  the requested key size in bits.  Example sizes for RSA keys are:
 428  512, 768, 1024, 2048.
 429
 430  Setting the following attributes explicitly will override the defaults below.
 431  See SecItem.h for detailed information on these attributes including the types
 432  of the values.
 433
 434  * kSecAttrLabel default NULL
 435  * kSecUseKeychain default NULL, which specifies the default keychain
 436  * kSecAttrApplicationTag default NULL
 437  * kSecAttrEffectiveKeySize default NULL same as kSecAttrKeySizeInBits
 438  * kSecAttrCanEncrypt default false for private keys, true for public keys
 439  * kSecAttrCanDecrypt default true for private keys, false for public keys
 440  * kSecAttrCanDerive default true
 441  * kSecAttrCanSign default true for private keys, false for public keys
 442  * kSecAttrCanVerify default false for private keys, true for public keys
 443  * kSecAttrCanWrap default false for private keys, true for public keys
 444  * kSecAttrCanUnwrap default true for private keys, false for public keys
 445
 446 */
 447 OSStatus SecKeyGeneratePair(CFDictionaryRef parameters,
 448         SecKeyRef *publicKey, SecKeyRef *privateKey)
 449         __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_2_0);
 450
 451 /*!
 452  @typedef SecKeyGeneratePairBlock
 453  @abstract Delivers the result from an asynchronous key pair generation.
 454  @param publicKey - the public key generated.   You must retain publicKey if you wish to use it after your block returns.
 455  @param privateKey - the private key generated.  You must retain publicKey if you wish to use it after your block returns.
 456  @param error - Any errors returned.   You must retain error if you wish to use it after your block returns.
 457  */
 458
 459 #ifdef __BLOCKS__
 460 typedef void (^SecKeyGeneratePairBlock)(SecKeyRef publicKey, SecKeyRef privateKey,  CFErrorRef error);
 461
 462
 463 /*!
 464  @function SecKeyGeneratePairAsync
 465  @abstract Generate a private/public keypair returning the values in a callback.
 466  @param parameters A dictionary containing one or more key-value pairs.
 467  @param deliveryQueue A dispatch queue to be used to deliver the results.
 468  @param result A callback function to result when the operation has completed.
 469  @result On success the function returns NULL.
 470
 471  @discussion In order to generate a keypair the parameters dictionary must
 472  at least contain the following keys:
 473
 474  * kSecAttrKeyType with a value being kSecAttrKeyTypeRSA or any other
 475  kSecAttrKeyType defined in SecItem.h
 476  * kSecAttrKeySizeInBits with a value being a CFNumberRef or CFStringRef
 477  containing the requested key size in bits.  Example sizes for RSA
 478  keys are: 512, 768, 1024, 2048.
 479
 480  The values below may be set either in the top-level dictionary or in a
 481  dictionary that is the value of the kSecPrivateKeyAttrs or
 482  kSecPublicKeyAttrs key in the top-level dictionary.  Setting these
 483  attributes explicitly will override the defaults below.  See SecItem.h
 484  for detailed information on these attributes including the types of
 485  the values.
 486
 487  * kSecAttrLabel default NULL
 488  * kSecAttrIsPermanent if this key is present and has a Boolean
 489  value of true, the key or key pair will be added to the default
 490  keychain.
 491  * kSecAttrApplicationTag default NULL
 492  * kSecAttrEffectiveKeySize default NULL same as kSecAttrKeySizeInBits
 493  * kSecAttrCanEncrypt default false for private keys, true for public keys
 494  * kSecAttrCanDecrypt default true for private keys, false for public keys
 495  * kSecAttrCanDerive default true
 496  * kSecAttrCanSign default true for private keys, false for public keys
 497  * kSecAttrCanVerify default false for private keys, true for public keys
 498  * kSecAttrCanWrap default false for private keys, true for public keys
 499  * kSecAttrCanUnwrap default true for private keys, false for public keys
 500
 501 */
 502 void SecKeyGeneratePairAsync(CFDictionaryRef parameters,
 503         dispatch_queue_t deliveryQueue, SecKeyGeneratePairBlock result)
 504         __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_NA);
 505
 506 #endif /* __BLOCKS__ */
 507
 508 // Derive, Wrap, and Unwrap
 509
 510 /*!
 511  @function SecKeyDeriveFromPassword
 512  @abstract Derives a symmetric key from a password.
 513
 514  @param password The password from which the keyis to be derived.
 515  @param parameters A dictionary containing one or more key-value pairs.
 516  @param error If the call fails this will contain the error code.
 517
 518  @discussion In order to derive a key the parameters dictionary must contain at least contain the following keys:
 519  * kSecAttrSalt - a CFData for the salt value for mixing in the pseudo-random rounds.
 520  * kSecAttrPRF - the algorithm to use for the pseudo-random-function.
 521    If 0, this defaults to kSecAttrPRFHmacAlgSHA1. Possible values are:
 522
 523  * kSecAttrPRFHmacAlgSHA1
 524  * kSecAttrPRFHmacAlgSHA224
 525  * kSecAttrPRFHmacAlgSHA256
 526  * kSecAttrPRFHmacAlgSHA384
 527  * kSecAttrPRFHmacAlgSHA512
 528
 529  * kSecAttrRounds - the number of rounds to call the pseudo random function.
 530    If 0, a count will be computed to average 1/10 of a second.
 531  * kSecAttrKeySizeInBits with a value being a CFNumberRef
 532    containing the requested key size in bits.  Example sizes for RSA keys are:
 533    512, 768, 1024, 2048.
 534
 535  @result On success a SecKeyRef is returned.  On failure this result is NULL and the
 536  error parameter contains the reason.
 537
 538 */
 539 SecKeyRef SecKeyDeriveFromPassword(CFStringRef password,
 540         CFDictionaryRef parameters, CFErrorRef *error)
 541         __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_NA);
 542
 543 /*!
 544  @function SecKeyWrapSymmetric
 545  @abstract Wraps a symmetric key with a symmetric key.
 546
 547  @param keyToWrap The key which is to be wrapped.
 548  @param wrappingKey The key wrapping key.
 549  #param parameters The parameter list to use for wrapping the key.
 550  @param error If the call fails this will contain the error code.
 551
 552  @result On success a CFDataRef is returned.  On failure this result is NULL and the
 553  error parameter contains the reason.
 554
 555  @discussion In order to wrap a key the parameters dictionary may contain the following key:
 556  * kSecSalt     - a CFData for the salt value for the encrypt.
 557
 558 */
 559 CFDataRef SecKeyWrapSymmetric(SecKeyRef keyToWrap,
 560         SecKeyRef wrappingKey, CFDictionaryRef parameters, CFErrorRef *error)
 561         __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_NA);
 562
 563 /*!
 564  @function SecKeyUnwrapSymmetric
 565  @abstract Unwrap a wrapped symmetric key.
 566
 567  @param keyToUnwrap The wrapped key to unwrap.
 568  @param unwrappingKey The key unwrapping key.
 569  #param parameters The parameter list to use for unwrapping the key.
 570  @param error If the call fails this will contain the error code.
 571
 572  @result On success a SecKeyRef is returned.  On failure this result is NULL and the
 573  error parameter contains the reason.
 574
 575  @discussion In order to unwrap a key the parameters dictionary may contain the following key:
 576  * kSecSalt     - a CFData for the salt value for the decrypt.
 577
 578 */
 579 SecKeyRef SecKeyUnwrapSymmetric(CFDataRef *keyToUnwrap,
 580         SecKeyRef unwrappingKey, CFDictionaryRef parameters, CFErrorRef *error)
 581         __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_NA);
 582
 583
 584 #if defined(__cplusplus)
 585 }
 586 #endif
 587
 588 #endif /* !_SECURITY_SECKEY_H_ */