mirror of
https://github.com/taigrr/arduinolibs
synced 2025-01-18 04:33:12 -08:00
175 lines
7.0 KiB
C
175 lines
7.0 KiB
C
/*
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* Copyright (C) 2015 Southern Storm Software, Pty Ltd.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#ifndef CRYPTO_ROTATEUTIL_H
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#define CRYPTO_ROTATEUTIL_H
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#include <inttypes.h>
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// Rotation functions that are optimised for best performance on AVR.
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// The most efficient rotations are where the number of bits is 1 or a
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// multiple of 8, so we compose the efficient rotations to produce all
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// other rotation counts of interest. All macros below assume arguments
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// of 32 bits in size.
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// Generic left rotate - best performance when "bits" is 1 or a multiple of 8.
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#define leftRotate(a, bits) \
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(__extension__ ({ \
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uint32_t _temp = (a); \
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(_temp << (bits)) | (_temp >> (32 - (bits))); \
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}))
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// Generic right rotate - best performance when "bits" is 1 or a multiple of 8.
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#define rightRotate(a, bits) \
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(__extension__ ({ \
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uint32_t _temp = (a); \
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(_temp >> (bits)) | (_temp << (32 - (bits))); \
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}))
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// Left rotate by 1.
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#define leftRotate1(a) (leftRotate((a), 1))
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// Left rotate by 2.
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#define leftRotate2(a) (leftRotate(leftRotate((a), 1), 1))
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// Left rotate by 3.
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#define leftRotate3(a) (leftRotate(leftRotate(leftRotate((a), 1), 1), 1))
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// Left rotate by 4.
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#define leftRotate4(a) (leftRotate(leftRotate(leftRotate(leftRotate((a), 1), 1), 1), 1))
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// Left rotate by 5: Rotate left by 8, then right by 3.
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#define leftRotate5(a) (rightRotate(rightRotate(rightRotate(leftRotate((a), 8), 1), 1), 1))
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// Left rotate by 6: Rotate left by 8, then right by 2.
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#define leftRotate6(a) (rightRotate(rightRotate(leftRotate((a), 8), 1), 1))
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// Left rotate by 7: Rotate left by 8, then right by 1.
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#define leftRotate7(a) (rightRotate(leftRotate((a), 8), 1))
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// Left rotate by 8.
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#define leftRotate8(a) (leftRotate((a), 8))
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// Left rotate by 9: Rotate left by 8, then left by 1.
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#define leftRotate9(a) (leftRotate(leftRotate((a), 8), 1))
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// Left rotate by 10: Rotate left by 8, then left by 2.
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#define leftRotate10(a) (leftRotate(leftRotate(leftRotate((a), 8), 1), 1))
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// Left rotate by 11: Rotate left by 8, then left by 3.
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#define leftRotate11(a) (leftRotate(leftRotate(leftRotate(leftRotate((a), 8), 1), 1), 1))
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// Left rotate by 12: Rotate left by 8, then left by 4.
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#define leftRotate12(a) (leftRotate(leftRotate(leftRotate(leftRotate(leftRotate((a), 8), 1), 1), 1), 1))
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// Left rotate by 13: Rotate left by 16, then right by 3.
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#define leftRotate13(a) (rightRotate(rightRotate(rightRotate(leftRotate((a), 16), 1), 1), 1))
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// Left rotate by 14: Rotate left by 16, then right by 2.
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#define leftRotate14(a) (rightRotate(rightRotate(leftRotate((a), 16), 1), 1))
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// Left rotate by 15: Rotate left by 16, then right by 1.
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#define leftRotate15(a) (rightRotate(leftRotate((a), 16), 1))
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// Left rotate by 16.
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#define leftRotate16(a) (leftRotate((a), 16))
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// Left rotate by 17: Rotate left by 16, then left by 1.
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#define leftRotate17(a) (leftRotate(leftRotate((a), 16), 1))
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// Left rotate by 18: Rotate left by 16, then left by 2.
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#define leftRotate18(a) (leftRotate(leftRotate(leftRotate((a), 16), 1), 1))
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// Left rotate by 19: Rotate left by 16, then left by 3.
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#define leftRotate19(a) (leftRotate(leftRotate(leftRotate(leftRotate((a), 16), 1), 1), 1))
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// Left rotate by 20: Rotate left by 16, then left by 4.
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#define leftRotate20(a) (leftRotate(leftRotate(leftRotate(leftRotate(leftRotate((a), 16), 1), 1), 1), 1))
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// Left rotate by 21: Rotate left by 24, then right by 3.
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#define leftRotate21(a) (rightRotate(rightRotate(rightRotate(leftRotate((a), 24), 1), 1), 1))
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// Left rotate by 22: Rotate left by 24, then right by 2.
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#define leftRotate22(a) (rightRotate(rightRotate(leftRotate((a), 24), 1), 1))
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// Left rotate by 23: Rotate left by 24, then right by 1.
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#define leftRotate23(a) (rightRotate(leftRotate((a), 24), 1))
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// Left rotate by 24.
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#define leftRotate24(a) (leftRotate((a), 24))
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// Left rotate by 25: Rotate left by 24, then left by 1.
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#define leftRotate25(a) (leftRotate(leftRotate((a), 24), 1))
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// Left rotate by 26: Rotate left by 24, then left by 2.
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#define leftRotate26(a) (leftRotate(leftRotate(leftRotate((a), 24), 1), 1))
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// Left rotate by 27: Rotate left by 24, then left by 3.
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#define leftRotate27(a) (leftRotate(leftRotate(leftRotate(leftRotate((a), 24), 1), 1), 1))
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// Left rotate by 28: Rotate right by 4.
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#define leftRotate28(a) (rightRotate(rightRotate(rightRotate(rightRotate((a), 1), 1), 1), 1))
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// Left rotate by 29: Rotate right by 3.
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#define leftRotate29(a) (rightRotate(rightRotate(rightRotate((a), 1), 1), 1))
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// Left rotate by 30: Rotate right by 2.
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#define leftRotate30(a) (rightRotate(rightRotate((a), 1), 1))
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// Left rotate by 31: Rotate right by 1.
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#define leftRotate31(a) (rightRotate((a), 1))
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// Define the right rotations in terms of left rotations.
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#define rightRotate1(a) (leftRotate31((a)))
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#define rightRotate2(a) (leftRotate30((a)))
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#define rightRotate3(a) (leftRotate29((a)))
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#define rightRotate4(a) (leftRotate28((a)))
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#define rightRotate5(a) (leftRotate27((a)))
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#define rightRotate6(a) (leftRotate26((a)))
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#define rightRotate7(a) (leftRotate25((a)))
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#define rightRotate8(a) (leftRotate24((a)))
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#define rightRotate9(a) (leftRotate23((a)))
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#define rightRotate10(a) (leftRotate22((a)))
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#define rightRotate11(a) (leftRotate21((a)))
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#define rightRotate12(a) (leftRotate20((a)))
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#define rightRotate13(a) (leftRotate19((a)))
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#define rightRotate14(a) (leftRotate18((a)))
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#define rightRotate15(a) (leftRotate17((a)))
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#define rightRotate16(a) (leftRotate16((a)))
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#define rightRotate17(a) (leftRotate15((a)))
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#define rightRotate18(a) (leftRotate14((a)))
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#define rightRotate19(a) (leftRotate13((a)))
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#define rightRotate20(a) (leftRotate12((a)))
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#define rightRotate21(a) (leftRotate11((a)))
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#define rightRotate22(a) (leftRotate10((a)))
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#define rightRotate23(a) (leftRotate9((a)))
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#define rightRotate24(a) (leftRotate8((a)))
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#define rightRotate25(a) (leftRotate7((a)))
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#define rightRotate26(a) (leftRotate6((a)))
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#define rightRotate27(a) (leftRotate5((a)))
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#define rightRotate28(a) (leftRotate4((a)))
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#define rightRotate29(a) (leftRotate3((a)))
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#define rightRotate30(a) (leftRotate2((a)))
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#define rightRotate31(a) (leftRotate1((a)))
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#endif
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