A direct port of java's bouncy castle implementation of PKCS12ParametersGenerator.java (http://java2s.com/Open-Source/Java/Security/Bouncy-Castle/org/bouncycastle/crypto/generators/PKCS12ParametersGenerator.java.htm)

PKCS12ParametersGenerator.h

#import <Foundation/Foundation.h>
#import <CommonCrypto/CommonDigest.h>

@interface PKCS12ParametersGenerator : NSObject {
    NSInteger keySize;
	NSInteger ivSize;
	NSInteger iterations;
	NSData *salt;
	NSString *password;
	NSData *derivedKey;
	NSData *derivedIV;
	uint8_t *ptrPasswordBytes;
	uint8_t *ptrSaltBytes;
	uint8_t *ptrPasswdPCKS12Bytes;
	size_t szPasswordLen;
	size_t szSaltLen;
	size_t szPasswdPKCS12Len;
	
}
@property (nonatomic, assign) NSInteger keySize;
@property (nonatomic, assign) NSInteger ivSize;
@property (nonatomic, assign) NSInteger iterations;
@property (nonatomic, assign) NSString *password;
@property (nonatomic, assign) NSData *salt;
@property (nonatomic, retain) NSData *derivedKey;
@property (nonatomic, retain) NSData *derivedIV;
@property (nonatomic, assign) uint8_t *ptrPasswordBytes;
@property (nonatomic, assign) uint8_t *ptrPasswdPCKS12Bytes;
@property (nonatomic, assign) uint8_t *ptrSaltBytes;
@property (nonatomic, assign) size_t szPasswordLen;
@property (nonatomic, assign) size_t szSaltLen;
@property (nonatomic, assign) size_t szPasswdPKCS12Len;

-(id) init    :(NSString *)argPassword  
	saltedHash:(NSData *)argSalt 
	 iterCount:(NSInteger) argIterations
	   keySize:(NSInteger) argKeySize 
  initVectSize:(NSInteger) argIVSize;
-(void) dealloc;

-(void) generateDerivedParameters;
-(uint8_t *) pkcs12Password : (uint8_t *)argPtrPassword;
-(unsigned char *)generateDerivedKey :(NSInteger) iMaterialType 
							  byteLen:(NSInteger)argSizeLen;
-(void) adjust :(unsigned char *)a offset:(size_t)aOff buffer:(unsigned char *)B;