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55 lines
2.0 KiB
55 lines
2.0 KiB
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _NANOHUB_RSA_H_
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#define _NANOHUB_RSA_H_
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#include <stdint.h>
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#define RSA_LEN 2048
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#define RSA_LIMBS ((RSA_LEN + 31)/ 32)
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#define RSA_BYTES sizeof(uint32_t[RSA_LIMBS])
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#define RSA_WORDS (RSA_BYTES / sizeof(uint32_t)) //limbs may change in size, but words are always same :)
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struct RsaState {
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uint32_t tmpA[RSA_LIMBS * 2];
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uint32_t tmpB[RSA_LIMBS + 1];
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#if defined(RSA_SUPPORT_PRIV_OP_LOWRAM)
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uint32_t tmpC[RSA_LIMBS + 1];
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#elif defined (RSA_SUPPORT_PRIV_OP_BIGRAM)
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uint32_t tmpC[RSA_LIMBS * 2];
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#endif
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};
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//calculate a ^ 65537 mod c, where a and c are each exactly RSA_LEN bits long, result is only valid as long as state is. state needs no init, set state to 0 at start, call till it is zero on return
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const uint32_t* rsaPubOpIterative(struct RsaState* state, const uint32_t *a, const uint32_t *c, uint32_t *state1, uint32_t *state2, uint32_t *stepP);
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#if defined(RSA_SUPPORT_PRIV_OP_LOWRAM) || defined (RSA_SUPPORT_PRIV_OP_BIGRAM)
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//calculate a ^ b mod c, where a and c are each exactly RSA_LEN bits long, result is only valid as long as state is. state needs no init
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const uint32_t* rsaPrivOp(struct RsaState* state, const uint32_t *a, const uint32_t *b, const uint32_t *c);
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const uint32_t* rsaPubOp(struct RsaState* state, const uint32_t *a, const uint32_t *c);
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#ifdef ARM
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#error "RSA private ops must never be compiled into firmware."
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#endif
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#endif
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#endif // _NANOHUB_RSA_H_
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