1 /******************************************************************************* 2 * Copyright 2002-2018 Intel Corporation 3 * All Rights Reserved. 4 * 5 * If this software was obtained under the Intel Simplified Software License, 6 * the following terms apply: 7 * 8 * The source code, information and material ("Material") contained herein is 9 * owned by Intel Corporation or its suppliers or licensors, and title to such 10 * Material remains with Intel Corporation or its suppliers or licensors. The 11 * Material contains proprietary information of Intel or its suppliers and 12 * licensors. The Material is protected by worldwide copyright laws and treaty 13 * provisions. No part of the Material may be used, copied, reproduced, 14 * modified, published, uploaded, posted, transmitted, distributed or disclosed 15 * in any way without Intel's prior express written permission. No license under 16 * any patent, copyright or other intellectual property rights in the Material 17 * is granted to or conferred upon you, either expressly, by implication, 18 * inducement, estoppel or otherwise. Any license under such intellectual 19 * property rights must be express and approved by Intel in writing. 20 * 21 * Unless otherwise agreed by Intel in writing, you may not remove or alter this 22 * notice or any other notice embedded in Materials by Intel or Intel's 23 * suppliers or licensors in any way. 24 * 25 * 26 * If this software was obtained under the Apache License, Version 2.0 (the 27 * "License"), the following terms apply: 28 * 29 * You may not use this file except in compliance with the License. You may 30 * obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 31 * 32 * 33 * Unless required by applicable law or agreed to in writing, software 34 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 35 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 36 * 37 * See the License for the specific language governing permissions and 38 * limitations under the License. 39 *******************************************************************************/ 40 41 /* 42 // Purpose: 43 // Intel(R) Integrated Performance Primitives. Cryptography Primitives. 44 // Internal Unsigned BNU misc functionality 45 // 46 // Contents: 47 // cpMSBit_BNU() 48 // 49 */ 50 51 #include "owncp.h" 52 #include "pcpbnumisc.h" 53 54 /*F* 55 // Name: cpMSBit_BNU 56 // 57 // Purpose: Returns Most Significant Bit of the BNU. 58 // 59 // Returns: 60 // Most Significant Bit of the BNU 61 // 62 // Parameters: 63 // pA BigNum A 64 // nsA size of A 65 // 66 // Note: 67 // if BNU==0, -1 will return 68 *F*/ 69 70 int cpMSBit_BNU(const BNU_CHUNK_T* pA, cpSize nsA) 71 { 72 int msb; 73 FIX_BNU(pA, nsA); 74 msb = nsA*BNU_CHUNK_BITS - cpNLZ_BNU(pA[nsA-1]) -1; 75 return msb; 76 } 77
