1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef _NANOHUB_RSA_H_ 18 #define _NANOHUB_RSA_H_ 19 20 #include <stdint.h> 21 22 #define RSA_LEN 2048 23 #define RSA_LIMBS ((RSA_LEN + 31)/ 32) 24 #define RSA_BYTES sizeof(uint32_t[RSA_LIMBS]) 25 #define RSA_WORDS (RSA_BYTES / sizeof(uint32_t)) //limbs may change in size, but words are always same :) 26 27 struct RsaState { 28 uint32_t tmpA[RSA_LIMBS * 2]; 29 uint32_t tmpB[RSA_LIMBS + 1]; 30 31 #if defined(RSA_SUPPORT_PRIV_OP_LOWRAM) 32 uint32_t tmpC[RSA_LIMBS + 1]; 33 #elif defined (RSA_SUPPORT_PRIV_OP_BIGRAM) 34 uint32_t tmpC[RSA_LIMBS * 2]; 35 #endif 36 }; 37 38 //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 39 const uint32_t* rsaPubOpIterative(struct RsaState* state, const uint32_t *a, const uint32_t *c, uint32_t *state1, uint32_t *state2, uint32_t *stepP); 40 41 #if defined(RSA_SUPPORT_PRIV_OP_LOWRAM) || defined (RSA_SUPPORT_PRIV_OP_BIGRAM) 42 //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 43 const uint32_t* rsaPrivOp(struct RsaState* state, const uint32_t *a, const uint32_t *b, const uint32_t *c); 44 const uint32_t* rsaPubOp(struct RsaState* state, const uint32_t *a, const uint32_t *c); 45 46 #ifdef ARM 47 #error "RSA private ops must never be compiled into firmware." 48 #endif 49 50 #endif 51 52 53 #endif // _NANOHUB_RSA_H_ 54 55
