From e1212ded3556546a568954bedc887fddcb128183 Mon Sep 17 00:00:00 2001 From: bg Date: Wed, 28 Mar 2012 04:35:58 +0000 Subject: [PATCH] forgotten file(s) --- mgf1/mgf1.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++ mgf1/mgf1.h | 36 +++++++++++++++++++++++++++++++++++ 2 files changed, 91 insertions(+) create mode 100644 mgf1/mgf1.c create mode 100644 mgf1/mgf1.h diff --git a/mgf1/mgf1.c b/mgf1/mgf1.c new file mode 100644 index 0000000..bdbf1ea --- /dev/null +++ b/mgf1/mgf1.c @@ -0,0 +1,55 @@ +/* mgf1.c */ +/* + This file is part of the AVR-Crypto-Lib. + Copyright (C) 2010 Daniel Otte (daniel.otte@rub.de) + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . +*/ + +#include +#include +#include "mgf1.h" +#include "hfal-basic.h" + +/* + * MGF1 as defined in PKCS #1 v2.1 B.2.1 + */ + + +void mgf1_short_seed(void* dest, const void* seed, uint8_t seed_len_B, uint16_t out_length_B, const mgf1_parameter_t* p){ + uint8_t buffer[seed_len_B+4]; + uint32_t counter=1; + uint8_t hv_len = hfal_hash_getHashsize(p->hashfunction)/8; + memcpy(buffer, seed, seed_len_B); + memset(buffer + seed_len_B, 0, 4); + while(out_length_B >= hv_len){ + hfal_hash_mem(p->hashfunction, dest, buffer, (seed_len_B + 4) * 8); + dest = (uint8_t*)dest + hv_len; + out_length_B -= hv_len; + buffer[seed_len_B + 3] = counter & 0xff; + buffer[seed_len_B + 2] = (counter>>8) & 0xff; + buffer[seed_len_B + 1] = (counter>>16) & 0xff; + buffer[seed_len_B + 0] = (counter>>24) & 0xff; + ++counter; + } + if(out_length_B){ + uint8_t hash_buffer[hv_len]; + hfal_hash_mem(p->hashfunction, hash_buffer, buffer, (seed_len_B + 4) * 8); + memcpy(dest, hash_buffer, out_length_B); + } +} + +void mgf1(void* dest, const void* seed, uint16_t seed_len_B, uint16_t out_length_B, const mgf1_parameter_t* p){ + mgf1_short_seed(dest, seed, seed_len_B, out_length_B, p); +} diff --git a/mgf1/mgf1.h b/mgf1/mgf1.h new file mode 100644 index 0000000..76c3b8d --- /dev/null +++ b/mgf1/mgf1.h @@ -0,0 +1,36 @@ +/* mgf1.h */ +/* + This file is part of the AVR-Crypto-Lib. + Copyright (C) 2010 Daniel Otte (daniel.otte@rub.de) + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . +*/ + +#ifndef MGF1_H_ +#define MGF1_H_ + +#include +#include "hfal-basic.h" + +typedef struct { + const hfdesc_t* hashfunction; +} mgf1_parameter_t; + +/* + * MGF1 as defined in PKCS #1 v2.1 B.2.1 + */ + +void mgf1(void* dest, const void* seed, uint16_t seed_len_B, uint16_t out_length_B, const mgf1_parameter_t* p); + +#endif /* MGF1_H_ */ -- 2.39.5