Security-55471.14.8.tar.gz

[apple/security.git] / libsecurity_keychain / lib / SecKey.h

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 * This file contains Original Code and/or Modifications of Original Code
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/*!
	@header SecKey
	The functions provided in SecKey.h implement and manage a particular
    type of keychain item that represents a key.  A key can be stored in a
    keychain, but a key can also be a transient object.

	You can use a key as a keychain item in most functions.
*/

#ifndef _SECURITY_SECKEY_H_
#define _SECURITY_SECKEY_H_

#include <dispatch/dispatch.h>
#include <Security/SecBase.h>
#include <Security/SecAccess.h>
#include <Security/cssmtype.h>
#include <CoreFoundation/CFDictionary.h>
#include <sys/types.h>

#if defined(__cplusplus)
extern "C" {
#endif

/*!
	@enum KeyItemAttributeConstants
	@abstract Specifies keychain item attributes for keys.
    @constant kSecKeyKeyClass type uint32 (CSSM_KEYCLASS), value
    is one of CSSM_KEYCLASS_PUBLIC_KEY, CSSM_KEYCLASS_PRIVATE_KEY
    or CSSM_KEYCLASS_SESSION_KEY.
    @constant kSecKeyPrintName type blob, human readable name of
    the key.  Same as kSecLabelItemAttr for normal keychain items.
    @constant kSecKeyAlias type blob, currently unused.
    @constant kSecKeyPermanent type uint32, value is nonzero iff
    this key is permanent (stored in some keychain).  This is always
    1.
    @constant kSecKeyPrivate type uint32, value is nonzero iff this
    key is protected by a user login or a password, or both.
    @constant kSecKeyModifiable type uint32, value is nonzero iff
    attributes of this key can be modified.
    @constant kSecKeyLabel type blob, for private and public keys
    this contains the hash of the public key.  This is used to
    associate certificates and keys.  Its value matches the value
    of the kSecPublicKeyHashItemAttr of a certificate and it's used
    to construct an identity from a certificate and a key.
    For symmetric keys this is whatever the creator of the key
    passed in during the generate key call.
    @constant kSecKeyApplicationTag type blob, currently unused.
    @constant kSecKeyKeyCreator type data, the data points to a
    CSSM_GUID structure representing the moduleid of the csp owning
    this key.
    @constant kSecKeyKeyType type uint32, value is a CSSM_ALGORITHMS
    representing the algorithm associated with this key.
    @constant kSecKeyKeySizeInBits type uint32, value is the number
    of bits in this key.
    @constant kSecKeyEffectiveKeySize type uint32, value is the
    effective number of bits in this key.  For example a des key
    has a kSecKeyKeySizeInBits of 64 but a kSecKeyEffectiveKeySize
    of 56.
    @constant kSecKeyStartDate type CSSM_DATE.  Earliest date from
    which this key may be used.  If the value is all zeros or not
    present, no restriction applies.
    @constant kSecKeyEndDate type CSSM_DATE.  Latest date at
    which this key may be used.  If the value is all zeros or not
    present, no restriction applies.
    @constant kSecKeySensitive type uint32, iff value is nonzero
    this key cannot be wrapped with CSSM_ALGID_NONE.
    @constant kSecKeyAlwaysSensitive type uint32, value is nonzero
    iff this key has always been marked sensitive.
    @constant kSecKeyExtractable type uint32, value is nonzero iff
    this key can be wrapped.
    @constant kSecKeyNeverExtractable type uint32, value is nonzero
    iff this key was never marked extractable.
    @constant kSecKeyEncrypt type uint32, value is nonzero iff this
    key can be used in an encrypt operation.
    @constant kSecKeyDecrypt type uint32, value is nonzero iff this
    key can be used in a decrypt operation.
    @constant kSecKeyDerive type uint32, value is nonzero iff this
    key can be used in a deriveKey operation.
    @constant kSecKeySign type uint32, value is nonzero iff this
    key can be used in a sign operation.
    @constant kSecKeyVerify type uint32, value is nonzero iff this
    key can be used in a verify operation.
    @constant kSecKeySignRecover type uint32.
    @constant kSecKeyVerifyRecover type uint32.
    key can unwrap other keys.
    @constant kSecKeyWrap type uint32, value is nonzero iff this
    key can wrap other keys.
    @constant kSecKeyUnwrap type uint32, value is nonzero iff this
    key can unwrap other keys.
	@discussion
	The use of these enumerations has been deprecated.  Please
	use the equivalent items defined in SecItem.h
	@@@.
*/
enum
{
    kSecKeyKeyClass =          0,
    kSecKeyPrintName =         1,
    kSecKeyAlias =             2,
    kSecKeyPermanent =         3,
    kSecKeyPrivate =           4,
    kSecKeyModifiable =        5,
    kSecKeyLabel =             6,
    kSecKeyApplicationTag =    7,
    kSecKeyKeyCreator =        8,
    kSecKeyKeyType =           9,
    kSecKeyKeySizeInBits =    10,
    kSecKeyEffectiveKeySize = 11,
    kSecKeyStartDate =        12,
    kSecKeyEndDate =          13,
    kSecKeySensitive =        14,
    kSecKeyAlwaysSensitive =  15,
    kSecKeyExtractable =      16,
    kSecKeyNeverExtractable = 17,
    kSecKeyEncrypt =          18,
    kSecKeyDecrypt =          19,
    kSecKeyDerive =           20,
    kSecKeySign =             21,
    kSecKeyVerify =           22,
    kSecKeySignRecover =      23,
    kSecKeyVerifyRecover =    24,
    kSecKeyWrap =             25,
    kSecKeyUnwrap =           26
};

/*!
    @typedef SecCredentialType
    @abstract Determines the type of credential returned by SecKeyGetCredentials.
*/
typedef uint32 SecCredentialType;

/*!
    @enum SecCredentialType
    @abstract Determines the type of credential returned by SecKeyGetCredentials.
    @constant kSecCredentialTypeWithUI Operations with this key are allowed to present UI if required.
    @constant kSecCredentialTypeNoUI Operations with this key are not allowed to present UI, and will fail if UI is required.
    @constant kSecCredentialTypeDefault The default setting for determining whether to present UI is used. This setting can be changed with a call to SecKeychainSetUserInteractionAllowed.
*/
enum
{
	kSecCredentialTypeDefault = 0,
	kSecCredentialTypeWithUI,
	kSecCredentialTypeNoUI
};

/*!
    @typedef SecPadding
    @abstract Supported padding types.
*/
typedef uint32_t SecPadding;
enum
{
    kSecPaddingNone      = 0,
    kSecPaddingPKCS1     = 1,

    /* For SecKeyRawSign/SecKeyRawVerify only, data to be signed is an MD2
       hash; standard ASN.1 padding will be done, as well as PKCS1 padding
       of the underlying RSA operation. */
    kSecPaddingPKCS1MD2  = 0x8000,

    /* For SecKeyRawSign/SecKeyRawVerify only, data to be signed is an MD5
       hash; standard ASN.1 padding will be done, as well as PKCS1 padding
       of the underlying RSA operation. */
    kSecPaddingPKCS1MD5  = 0x8001,

    /* For SecKeyRawSign/SecKeyRawVerify only, data to be signed is a SHA1
       hash; standard ASN.1 padding will be done, as well as PKCS1 padding
       of the underlying RSA operation. */
    kSecPaddingPKCS1SHA1 = 0x8002,
};

/*!
    @typedef SecKeySizes
    @abstract Supported key lengths.
*/
typedef uint32_t SecKeySizes;
enum
{
    kSecDefaultKeySize  = 0,

    // Symmetric Keysizes - default is currently kSecAES128 for AES.
    kSec3DES192         = 192,
    kSecAES128          = 128,
    kSecAES192          = 192,
    kSecAES256          = 256,

    // Supported ECC Keys for Suite-B from RFC 4492 section 5.1.1.
    // default is currently kSecp256r1
    kSecp192r1          = 192,
    kSecp256r1          = 256,
    kSecp384r1          = 384,
    kSecp521r1          = 521,  // Yes, 521

    // Boundaries for RSA KeySizes - default is currently 2048
		// RSA keysizes must be multiples of 8
    kSecRSAMin          = 1024,
    kSecRSAMax          = 4096
};


/*!
	@function SecKeyGetTypeID
	@abstract Returns the type identifier of SecKey instances.
	@result The CFTypeID of SecKey instances.
*/
CFTypeID SecKeyGetTypeID(void)
	__OSX_AVAILABLE_STARTING(__MAC_10_3, __IPHONE_2_0);

/*!
	@function SecKeyCreatePair
	@abstract Creates an asymmetric key pair and stores it in a specified keychain.
	@param keychainRef A reference to the keychain in which to store the private and public key items. Specify NULL for the default keychain.
    @param algorithm An algorithm for the key pair. This parameter is ignored if a valid (non-zero) contextHandle is supplied.
    @param keySizeInBits A key size for the key pair. This parameter is ignored if a valid (non-zero) contextHandle is supplied.
	@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.
	@param publicKeyUsage A bit mask indicating all permitted uses for the new public key. CSSM_KEYUSE bit mask values are defined in cssmtype.h.
    @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.
    @param privateKeyUsage A bit mask indicating all permitted uses for the new private key. CSSM_KEYUSE bit mask values are defined in cssmtype.h.
    @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.
    @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.
    @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.
    @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.
	@result A result code. See "Security Error Codes" (SecBase.h).
	@discussion This API is deprecated for 10.7 Plese use the SecKeyGeneratePair API
*/
OSStatus SecKeyCreatePair(
        SecKeychainRef keychainRef,
        CSSM_ALGORITHMS algorithm,
        uint32 keySizeInBits,
        CSSM_CC_HANDLE contextHandle,
        CSSM_KEYUSE publicKeyUsage,
        uint32 publicKeyAttr,
        CSSM_KEYUSE privateKeyUsage,
        uint32 privateKeyAttr,
        SecAccessRef initialAccess,
        SecKeyRef* publicKey,
        SecKeyRef* privateKey)
		DEPRECATED_IN_MAC_OS_X_VERSION_10_7_AND_LATER;

/*!
	@function SecKeyGenerate
	@abstract Creates a symmetric key and optionally stores it in a specified keychain.
	@param keychainRef (optional) A reference to the keychain in which to store the generated key. Specify NULL to generate a transient key.
    @param algorithm An algorithm for the symmetric key. This parameter is ignored if a valid (non-zero) contextHandle is supplied.
    @param keySizeInBits A key size for the key pair. This parameter is ignored if a valid (non-zero) contextHandle is supplied.
	@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.
	@param keyUsage A bit mask indicating all permitted uses for the new key. CSSM_KEYUSE bit mask values are defined in cssmtype.h.
    @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.
    @param initialAccess (optional) A SecAccess object that determines the initial access rights for the key. This parameter is ignored if the keychainRef is NULL.
    @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.
	@result A result code.  See "Security Error Codes" (SecBase.h).
	@discussion This API is deprecated for 10.7.  Plese use the SecKeyGenerateSymmetric API
*/
OSStatus SecKeyGenerate(
        SecKeychainRef keychainRef,
        CSSM_ALGORITHMS algorithm,
        uint32 keySizeInBits,
        CSSM_CC_HANDLE contextHandle,
        CSSM_KEYUSE keyUsage,
        uint32 keyAttr,
        SecAccessRef initialAccess,
        SecKeyRef* keyRef)
		DEPRECATED_IN_MAC_OS_X_VERSION_10_7_AND_LATER;

/*!
    @function SecKeyGetCSSMKey
    @abstract Returns a pointer to the CSSM_KEY for the given key item reference.
    @param key A keychain key item reference. The key item must be of class type kSecPublicKeyItemClass, kSecPrivateKeyItemClass, or kSecSymmetricKeyItemClass.
    @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.
    @result A result code. See "Security Error Codes" (SecBase.h).
    @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.
*/
OSStatus SecKeyGetCSSMKey(SecKeyRef key, const CSSM_KEY **cssmKey)
	DEPRECATED_IN_MAC_OS_X_VERSION_10_7_AND_LATER;;

/*!
    @function SecKeyGetCSPHandle
    @abstract Returns the CSSM_CSP_HANDLE for the given key reference. The handle is valid until the key reference is released.
    @param keyRef A key reference.
    @param cspHandle On return, the CSSM_CSP_HANDLE for the given keychain.
    @result A result code. See "Security Error Codes" (SecBase.h).
	@discussion This API is deprecated in 10.7. Its use should no longer be needed.
*/
OSStatus SecKeyGetCSPHandle(SecKeyRef keyRef, CSSM_CSP_HANDLE *cspHandle)
	DEPRECATED_IN_MAC_OS_X_VERSION_10_7_AND_LATER;

/*!
    @function SecKeyGetCredentials
    @abstract For a given key, return a pointer to a CSSM_ACCESS_CREDENTIALS structure which will allow the key to be used.
    @param keyRef The key for which a credential is requested.
    @param operation The type of operation to be performed with this key. See "Authorization tag type" for defined operations (cssmtype.h).
    @param credentialType The type of credential requested.
    @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.
    @result A result code. See "Security Error Codes" (SecBase.h).
*/
OSStatus SecKeyGetCredentials(
        SecKeyRef keyRef,
        CSSM_ACL_AUTHORIZATION_TAG operation,
        SecCredentialType credentialType,
        const CSSM_ACCESS_CREDENTIALS **outCredentials)
		DEPRECATED_IN_MAC_OS_X_VERSION_10_7_AND_LATER;

/*!
    @function SecKeyGetBlockSize
    @abstract Decrypt a block of ciphertext.
    @param key The key for which the block length is requested.
    @result The block length of the key in bytes.
    @discussion If for example key is an RSA key the value returned by
    this function is the size of the modulus.
 */
size_t SecKeyGetBlockSize(SecKeyRef key)
	__OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_2_0);

/*!
 @function	SecKeyGenerateSymmetric
 @abstract	Generates a random symmetric key with the specified length
 and algorithm type.

 @param parameters A dictionary containing one or more key-value pairs.
 See the discussion sections below for a complete overview of options.
 @param error An optional pointer to a CFErrorRef. This value is set
 if an error occurred. If not NULL, the caller is responsible for
 releasing the CFErrorRef.
 @result On return, a SecKeyRef reference to the symmetric key, or
 NULL if the key could not be created.

 @discussion In order to generate a symmetric key, the parameters dictionary
 must at least contain the following keys:

 * kSecAttrKeyType with a value of kSecAttrKeyTypeAES or any other
 kSecAttrKeyType defined in SecItem.h
 * kSecAttrKeySizeInBits with a value being a CFNumberRef containing
 the requested key size in bits.  Example sizes for AES keys are:
 128, 192, 256, 512.

 To store the generated symmetric key in a keychain, set these keys:
 * kSecUseKeychain (value is a SecKeychainRef)
 * kSecAttrLabel (a user-visible label whose value is a CFStringRef,
 e.g. "My App's Encryption Key")
 * kSecAttrApplicationLabel (a label defined by your application, whose
 value is a CFStringRef and which can be used to find this key in a
 subsequent call to SecItemCopyMatching, e.g. "ID-1234567890-9876-0151")

 To specify the generated key's access control settings, set this key:
 * kSecAttrAccess (value is a SecAccessRef)

 The keys below may be optionally set in the parameters dictionary
 (with a CFBooleanRef value) to override the default usage values:

 * kSecAttrCanEncrypt (defaults to true if not explicitly specified)
 * kSecAttrCanDecrypt (defaults to true if not explicitly specified)
 * kSecAttrCanWrap (defaults to true if not explicitly specified)
 * kSecAttrCanUnwrap (defaults to true if not explicitly specified)

*/
SecKeyRef SecKeyGenerateSymmetric(CFDictionaryRef parameters, CFErrorRef *error)
	__OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_NA);


/*!
 @function	SecKeyCreateFromData
 @abstract	Creates a symmetric key with the given data and sets the
 algorithm type specified.

 @param parameters A dictionary containing one or more key-value pairs.
 See the discussion sections below for a complete overview of options.
 @result On return, a SecKeyRef reference to the symmetric key.

 @discussion In order to generate a symmetric key the parameters dictionary must
 at least contain the following keys:

 * kSecAttrKeyType with a value of kSecAttrKeyTypeAES or any other
 kSecAttrKeyType defined in SecItem.h

 The keys below may be optionally set in the parameters dictionary
 (with a CFBooleanRef value) to override the default usage values:

 * kSecAttrCanEncrypt (defaults to true if not explicitly specified)
 * kSecAttrCanDecrypt (defaults to true if not explicitly specified)
 * kSecAttrCanWrap (defaults to true if not explicitly specified)
 * kSecAttrCanUnwrap (defaults to true if not explicitly specified)

*/
SecKeyRef SecKeyCreateFromData(CFDictionaryRef parameters,
	CFDataRef keyData, CFErrorRef *error)
	__OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_NA);


/*!
 @function SecKeyGeneratePair
 @abstract Generate a private/public keypair.
 @param parameters A dictionary containing one or more key-value pairs.
 @result A result code. See "Security Error Codes" (SecBase.h). On success,
 the result code will be errSecSuccess, and the output parameters will
 contain the public SecKeyRef and private SecKeyRef. It is the caller's
 responsibility to CFRelease these key references when finished with them.

 @discussion In order to generate a keypair the parameters dictionary must
 at least contain the following keys:

 * kSecAttrKeyType with a value of kSecAttrKeyTypeRSA or any other
 kSecAttrKeyType defined in SecItem.h
 * kSecAttrKeySizeInBits with a value being a CFNumberRef containing
 the requested key size in bits.  Example sizes for RSA keys are:
 512, 768, 1024, 2048.

 Setting the following attributes explicitly will override the defaults below.
 See SecItem.h for detailed information on these attributes including the types
 of the values.

 * kSecAttrLabel default NULL
 * kSecUseKeychain default NULL, which specifies the default keychain
 * kSecAttrApplicationTag default NULL
 * kSecAttrEffectiveKeySize default NULL same as kSecAttrKeySizeInBits
 * kSecAttrCanEncrypt default false for private keys, true for public keys
 * kSecAttrCanDecrypt default true for private keys, false for public keys
 * kSecAttrCanDerive default true
 * kSecAttrCanSign default true for private keys, false for public keys
 * kSecAttrCanVerify default false for private keys, true for public keys
 * kSecAttrCanWrap default false for private keys, true for public keys
 * kSecAttrCanUnwrap default true for private keys, false for public keys

*/
OSStatus SecKeyGeneratePair(CFDictionaryRef parameters,
	SecKeyRef *publicKey, SecKeyRef *privateKey)
	__OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_2_0);

/*!
 @typedef SecKeyGeneratePairBlock
 @abstract Delivers the result from an asynchronous key pair generation.
 @param publicKey - the public key generated.   You must retain publicKey if you wish to use it after your block returns.
 @param privateKey - the private key generated.  You must retain publicKey if you wish to use it after your block returns.
 @param error - Any errors returned.   You must retain error if you wish to use it after your block returns.
 */

#ifdef __BLOCKS__
typedef void (^SecKeyGeneratePairBlock)(SecKeyRef publicKey, SecKeyRef privateKey,  CFErrorRef error);


/*!
 @function SecKeyGeneratePairAsync
 @abstract Generate a private/public keypair returning the values in a callback.
 @param parameters A dictionary containing one or more key-value pairs.
 @param deliveryQueue A dispatch queue to be used to deliver the results.
 @param result A callback function to result when the operation has completed.
 @result On success the function returns NULL.

 @discussion In order to generate a keypair the parameters dictionary must
 at least contain the following keys:

 * kSecAttrKeyType with a value being kSecAttrKeyTypeRSA or any other
 kSecAttrKeyType defined in SecItem.h
 * kSecAttrKeySizeInBits with a value being a CFNumberRef or CFStringRef
 containing the requested key size in bits.  Example sizes for RSA
 keys are: 512, 768, 1024, 2048.

 The values below may be set either in the top-level dictionary or in a
 dictionary that is the value of the kSecPrivateKeyAttrs or
 kSecPublicKeyAttrs key in the top-level dictionary.  Setting these
 attributes explicitly will override the defaults below.  See SecItem.h
 for detailed information on these attributes including the types of
 the values.

 * kSecAttrLabel default NULL
 * kSecAttrIsPermanent if this key is present and has a Boolean
 value of true, the key or key pair will be added to the default
 keychain.
 * kSecAttrApplicationTag default NULL
 * kSecAttrEffectiveKeySize default NULL same as kSecAttrKeySizeInBits
 * kSecAttrCanEncrypt default false for private keys, true for public keys
 * kSecAttrCanDecrypt default true for private keys, false for public keys
 * kSecAttrCanDerive default true
 * kSecAttrCanSign default true for private keys, false for public keys
 * kSecAttrCanVerify default false for private keys, true for public keys
 * kSecAttrCanWrap default false for private keys, true for public keys
 * kSecAttrCanUnwrap default true for private keys, false for public keys

*/
void SecKeyGeneratePairAsync(CFDictionaryRef parameters,
	dispatch_queue_t deliveryQueue, SecKeyGeneratePairBlock result)
	__OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_NA);

#endif /* __BLOCKS__ */

// Derive, Wrap, and Unwrap

/*!
 @function SecKeyDeriveFromPassword
 @abstract Derives a symmetric key from a password.

 @param password The password from which the keyis to be derived.
 @param parameters A dictionary containing one or more key-value pairs.
 @param error If the call fails this will contain the error code.

 @discussion In order to derive a key the parameters dictionary must contain at least contain the following keys:
 * kSecAttrSalt	- a CFData for the salt value for mixing in the pseudo-random rounds.
 * kSecAttrPRF - the algorithm to use for the pseudo-random-function.
   If 0, this defaults to kSecAttrPRFHmacAlgSHA1. Possible values are:

 * kSecAttrPRFHmacAlgSHA1
 * kSecAttrPRFHmacAlgSHA224
 * kSecAttrPRFHmacAlgSHA256
 * kSecAttrPRFHmacAlgSHA384
 * kSecAttrPRFHmacAlgSHA512

 * kSecAttrRounds - the number of rounds to call the pseudo random function.
   If 0, a count will be computed to average 1/10 of a second.
 * kSecAttrKeySizeInBits with a value being a CFNumberRef
   containing the requested key size in bits.  Example sizes for RSA keys are:
   512, 768, 1024, 2048.

 @result On success a SecKeyRef is returned.  On failure this result is NULL and the
 error parameter contains the reason.

*/
SecKeyRef SecKeyDeriveFromPassword(CFStringRef password,
	CFDictionaryRef parameters, CFErrorRef *error)
	__OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_NA);

/*!
 @function SecKeyWrapSymmetric
 @abstract Wraps a symmetric key with a symmetric key.

 @param keyToWrap The key which is to be wrapped.
 @param wrappingKey The key wrapping key.
 #param parameters The parameter list to use for wrapping the key.
 @param error If the call fails this will contain the error code.

 @result On success a CFDataRef is returned.  On failure this result is NULL and the
 error parameter contains the reason.

 @discussion In order to wrap a key the parameters dictionary may contain the following key:
 * kSecSalt	- a CFData for the salt value for the encrypt.

*/
CFDataRef SecKeyWrapSymmetric(SecKeyRef keyToWrap,
	SecKeyRef wrappingKey, CFDictionaryRef parameters, CFErrorRef *error)
	__OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_NA);

/*!
 @function SecKeyUnwrapSymmetric
 @abstract Unwrap a wrapped symmetric key.

 @param keyToUnwrap The wrapped key to unwrap.
 @param unwrappingKey The key unwrapping key.
 #param parameters The parameter list to use for unwrapping the key.
 @param error If the call fails this will contain the error code.

 @result On success a SecKeyRef is returned.  On failure this result is NULL and the
 error parameter contains the reason.

 @discussion In order to unwrap a key the parameters dictionary may contain the following key:
 * kSecSalt	- a CFData for the salt value for the decrypt.

*/
SecKeyRef SecKeyUnwrapSymmetric(CFDataRef *keyToUnwrap,
	SecKeyRef unwrappingKey, CFDictionaryRef parameters, CFErrorRef *error)
	__OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_NA);


#if defined(__cplusplus)
}
#endif

#endif /* !_SECURITY_SECKEY_H_ */