android / device / google / contexthub / refs/tags/android-n-iot-release-smart-display-r2 / . / lib / include / nanohub / rsa.h

/* | |

* Copyright (C) 2016 The Android Open Source Project | |

* | |

* Licensed under the Apache License, Version 2.0 (the "License"); | |

* you may not use this file except in compliance with the License. | |

* You may obtain a copy of the License at | |

* | |

* http://www.apache.org/licenses/LICENSE-2.0 | |

* | |

* Unless required by applicable law or agreed to in writing, software | |

* distributed under the License is distributed on an "AS IS" BASIS, | |

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |

* See the License for the specific language governing permissions and | |

* limitations under the License. | |

*/ | |

#ifndef _NANOHUB_RSA_H_ | |

#define _NANOHUB_RSA_H_ | |

#include <stdint.h> | |

#define RSA_LEN 2048 | |

#define RSA_LIMBS ((RSA_LEN + 31)/ 32) | |

#define RSA_BYTES sizeof(uint32_t[RSA_LIMBS]) | |

#define RSA_WORDS (RSA_BYTES / sizeof(uint32_t)) //limbs may change in size, but words are always same :) | |

struct RsaState { | |

uint32_t tmpA[RSA_LIMBS * 2]; | |

uint32_t tmpB[RSA_LIMBS + 1]; | |

#if defined(RSA_SUPPORT_PRIV_OP_LOWRAM) | |

uint32_t tmpC[RSA_LIMBS + 1]; | |

#elif defined (RSA_SUPPORT_PRIV_OP_BIGRAM) | |

uint32_t tmpC[RSA_LIMBS * 2]; | |

#endif | |

}; | |

//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 | |

const uint32_t* rsaPubOpIterative(struct RsaState* state, const uint32_t *a, const uint32_t *c, uint32_t *state1, uint32_t *state2, uint32_t *stepP); | |

#if defined(RSA_SUPPORT_PRIV_OP_LOWRAM) || defined (RSA_SUPPORT_PRIV_OP_BIGRAM) | |

//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 | |

const uint32_t* rsaPrivOp(struct RsaState* state, const uint32_t *a, const uint32_t *b, const uint32_t *c); | |

const uint32_t* rsaPubOp(struct RsaState* state, const uint32_t *a, const uint32_t *c); | |

#ifdef ARM | |

#error "RSA private ops must never be compiled into firmware." | |

#endif | |

#endif | |

#endif // _NANOHUB_RSA_H_ | |