97 lines
3.2 KiB
C
97 lines
3.2 KiB
C
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/**
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* @file OTPCalculator.h
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @section DESCRIPTION
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*
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* Object that calculates OTPs.
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*/
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#ifndef BADVPN_SECURITY_OTPCALCULATOR_H
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#define BADVPN_SECURITY_OTPCALCULATOR_H
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#include <stdlib.h>
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#include <string.h>
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#include <misc/balign.h>
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#include <misc/debug.h>
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#include <security/BRandom.h>
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#include <security/BEncryption.h>
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#include <base/DebugObject.h>
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/**
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* Type for an OTP.
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*/
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typedef uint32_t otp_t;
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/**
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* Object that calculates OTPs.
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*/
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typedef struct {
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DebugObject d_obj;
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int num_otps;
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int cipher;
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int block_size;
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size_t num_blocks;
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otp_t *data;
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} OTPCalculator;
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/**
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* Initializes the calculator.
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* {@link BSecurity_GlobalInitThreadSafe} must have been done if this object
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* will be used from a non-main thread.
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*
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* @param calc the object
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* @param num_otps number of OTPs to generate from a seed. Must be >=0.
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* @param cipher encryption cipher for calculating the OTPs. Must be valid
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* according to {@link BEncryption_cipher_valid}.
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* @return 1 on success, 0 on failure
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*/
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int OTPCalculator_Init (OTPCalculator *calc, int num_otps, int cipher) WARN_UNUSED;
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/**
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* Frees the calculator.
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*
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* @param calc the object
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*/
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void OTPCalculator_Free (OTPCalculator *calc);
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/**
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* Generates OTPs from the given key and IV.
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*
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* @param calc the object
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* @param key encryption key
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* @param iv initialization vector
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* @param shuffle whether to shuffle the OTPs. Must be 1 or 0.
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* @return pointer to an array of 32-bit OPTs. Constains as many OTPs as was specified
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* in {@link OTPCalculator_Init}. Valid until the next generation or
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* until the object is freed.
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*/
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otp_t * OTPCalculator_Generate (OTPCalculator *calc, uint8_t *key, uint8_t *iv, int shuffle);
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#endif
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