1/* 2 * Copyright (c) 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#include <CoreFoundation/CoreFoundation.h> 26#include "corecrypto/ccsha1.h" 27#include "corecrypto/ccrsa_priv.h" 28#include "corecrypto/ccrng_system.h" 29#include "corecrypto/ccn.h" 30#include "stdio.h" 31#include "misc.h" 32 33// corecrypto headers don't like C++ (on a deaper level then extern "C" {} can fix 34// so we need a C "shim" for all our corecrypto use. 35 36#warning "This declaration should be in some headers" 37CFDataRef oaep_padding_via_c(int desired_message_length, CFDataRef dataValue); 38CFDataRef oaep_padding_via_c(int desired_message_length, CFDataRef dataValue) 39{ 40 cc_unit paddingBuffer[ccn_nof_size(desired_message_length)]; 41 bzero(paddingBuffer, sizeof(cc_unit) * ccn_nof_size(desired_message_length)); // XXX needed?? 42 static dispatch_once_t randomNumberGenneratorInitialzed; 43 static struct ccrng_system_state rng; 44 dispatch_once(&randomNumberGenneratorInitialzed, ^{ 45 ccrng_system_init(&rng); 46 }); 47 48 ccrsa_oaep_encode(ccsha1_di(), 49 (struct ccrng_state*)&rng, 50 sizeof(paddingBuffer), (cc_unit*)paddingBuffer, 51 CFDataGetLength(dataValue), CFDataGetBytePtr(dataValue)); 52 ccn_swap(ccn_nof_size(sizeof(paddingBuffer)), (cc_unit*)paddingBuffer); 53 54 CFDataRef paddedValue = CFDataCreate(NULL, (UInt8*)paddingBuffer, desired_message_length); 55 return paddedValue ? paddedValue : (void*)GetNoMemoryErrorAndRetain(); 56} 57 58#warning "This declaration should be in some headers" 59CFDataRef oaep_unpadding_via_c(CFDataRef encodedMessage); 60CFDataRef oaep_unpadding_via_c(CFDataRef encodedMessage) 61{ 62 size_t mlen = CFDataGetLength(encodedMessage); 63 cc_size n = ccn_nof_size(mlen); 64 cc_unit paddingBuffer[n]; 65 UInt8 plainText[mlen]; 66 67 ccn_read_uint(n, paddingBuffer, mlen, CFDataGetBytePtr(encodedMessage)); 68 size_t plainTextLength = mlen; 69 int err = ccrsa_oaep_decode(ccsha1_di(), &plainTextLength, plainText, mlen, paddingBuffer); 70 71 if (err) { 72 // XXX should make a CFError or something. 73 return (void*)fancy_error(CFSTR("CoreCrypto"), err, CFSTR("OAEP decode error")); 74 } 75 CFDataRef result = CFDataCreate(NULL, (UInt8*)plainText, plainTextLength); 76 return result; 77} 78