From a671200261961c2b6b7a5fedd6a899e03ddcb8c2 Mon Sep 17 00:00:00 2001 From: Frank Voorburg Date: Tue, 15 Aug 2017 13:41:51 +0000 Subject: [PATCH] Refs #369. Added AES256 cryptography utility functions to LibOpenBLT. git-svn-id: https://svn.code.sf.net/p/openblt/code/trunk@331 5dc33758-31d5-4daf-9ae8-b24bf3d40d73 --- Host/Source/LibOpenBLT/aes256.c | 400 +++++++++++++++++++++++++++++ Host/Source/LibOpenBLT/aes256.h | 39 +++ Host/Source/LibOpenBLT/openblt.c | 68 +++++ Host/Source/LibOpenBLT/openblt.h | 4 + Host/Source/LibOpenBLT/openblt.pas | 4 + Host/Source/LibOpenBLT/util.c | 81 ++++++ Host/Source/LibOpenBLT/util.h | 2 + 7 files changed, 598 insertions(+) create mode 100755 Host/Source/LibOpenBLT/aes256.c create mode 100755 Host/Source/LibOpenBLT/aes256.h diff --git a/Host/Source/LibOpenBLT/aes256.c b/Host/Source/LibOpenBLT/aes256.c new file mode 100755 index 00000000..1de1a645 --- /dev/null +++ b/Host/Source/LibOpenBLT/aes256.c @@ -0,0 +1,400 @@ +/* +* Byte-oriented AES-256 implementation. +* All lookup tables replaced with 'on the fly' calculations. +* +* Copyright (c) 2007-2011 Ilya O. Levin, http://www.literatecode.com +* Other contributors: Hal Finney +* +* Permission to use, copy, modify, and distribute this software for any +* purpose with or without fee is hereby granted, provided that the above +* copyright notice and this permission notice appear in all copies. +* +* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES +* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF +* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR +* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES +* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN +* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF +* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. +*/ +#include /* for standard integer types */ +#include "aes256.h" + +#define FD(x) (((x) >> 1) ^ (((x) & 1) ? 0x8d : 0)) + +#define BACK_TO_TABLES + +static uint8_t rj_xtime(uint8_t); +static void aes_subBytes(uint8_t *); +static void aes_subBytes_inv(uint8_t *); +static void aes_addRoundKey(uint8_t *, uint8_t const *); +static void aes_addRoundKey_cpy(uint8_t *, uint8_t const *, uint8_t *); +static void aes_shiftRows(uint8_t *); +static void aes_shiftRows_inv(uint8_t *); +static void aes_mixColumns(uint8_t *); +static void aes_mixColumns_inv(uint8_t *); +static void aes_expandEncKey(uint8_t *, uint8_t *); +static void aes_expandDecKey(uint8_t *, uint8_t *); +#ifndef BACK_TO_TABLES +static uint8_t gf_alog(uint8_t); +static uint8_t gf_log(uint8_t); +static uint8_t gf_mulinv(uint8_t); +static uint8_t rj_sbox(uint8_t); +static uint8_t rj_sbox_inv(uint8_t); +#endif + +#ifdef BACK_TO_TABLES + +static const uint8_t sbox[256] = +{ + 0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, + 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76, + 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, + 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, + 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, + 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15, + 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, + 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, + 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, + 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, + 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, + 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf, + 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, + 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, + 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, + 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, + 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, + 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73, + 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, + 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb, + 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, + 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, + 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, + 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08, + 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, + 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a, + 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, + 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, + 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, + 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, + 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, + 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 +}; +static const uint8_t sboxinv[256] = +{ + 0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, + 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb, + 0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, + 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb, + 0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, + 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e, + 0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, + 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25, + 0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, + 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92, + 0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, + 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84, + 0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, + 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06, + 0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, + 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b, + 0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, + 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73, + 0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, + 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e, + 0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, + 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b, + 0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, + 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4, + 0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, + 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f, + 0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, + 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef, + 0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, + 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61, + 0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, + 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d +}; + +#define rj_sbox(x) sbox[(x)] +#define rj_sbox_inv(x) sboxinv[(x)] + +#else /* tableless subroutines */ + +/* -------------------------------------------------------------------------- */ +static uint8_t gf_alog(uint8_t x) // calculate anti-logarithm gen 3 +{ + uint8_t y = 1, i; + + for (i = 0; i < x; i++) y ^= rj_xtime(y); + + return y; +} /* gf_alog */ + +/* -------------------------------------------------------------------------- */ +static uint8_t gf_log(uint8_t x) // calculate logarithm gen 3 +{ + uint8_t y, i = 0; + + if (x) + for (i = 1, y = 1; i > 0; i++ ) + { + y ^= rj_xtime(y); + if (y == x) break; + } + + return i; +} /* gf_log */ + + +/* -------------------------------------------------------------------------- */ +static uint8_t gf_mulinv(uint8_t x) // calculate multiplicative inverse +{ + return (x) ? gf_alog(255 - gf_log(x)) : 0; +} /* gf_mulinv */ + +/* -------------------------------------------------------------------------- */ +static uint8_t rj_sbox(uint8_t x) +{ + uint8_t y, sb; + + sb = y = gf_mulinv(x); + y = (uint8_t)(y << 1) | (y >> 7), sb ^= y; + y = (uint8_t)(y << 1) | (y >> 7), sb ^= y; + y = (uint8_t)(y << 1) | (y >> 7), sb ^= y; + y = (uint8_t)(y << 1) | (y >> 7), sb ^= y; + + return (sb ^ 0x63); +} /* rj_sbox */ + +/* -------------------------------------------------------------------------- */ +static uint8_t rj_sbox_inv(uint8_t x) +{ + uint8_t y, sb; + + y = x ^ 0x63; + sb = y = (uint8_t)(y << 1) | (y >> 7); + y = (uint8_t)(y << 2) | (y >> 6); + sb ^= y; + y = (uint8_t)(y << 3) | (y >> 5); + sb ^= y; + + return gf_mulinv(sb); +} /* rj_sbox_inv */ + +#endif + +/* -------------------------------------------------------------------------- */ +static uint8_t rj_xtime(uint8_t x) +{ + uint8_t y = (uint8_t)(x << 1); + return (x & 0x80) ? (y ^ 0x1b) : y; +} /* rj_xtime */ + +/* -------------------------------------------------------------------------- */ +static void aes_subBytes(uint8_t *buf) +{ + register uint8_t i = 16; + + while (i--) buf[i] = rj_sbox(buf[i]); +} /* aes_subBytes */ + +/* -------------------------------------------------------------------------- */ +static void aes_subBytes_inv(uint8_t *buf) +{ + register uint8_t i = 16; + + while (i--) buf[i] = rj_sbox_inv(buf[i]); +} /* aes_subBytes_inv */ + +/* -------------------------------------------------------------------------- */ +static void aes_addRoundKey(uint8_t *buf, uint8_t const *key) +{ + register uint8_t i = 16; + + while (i--) buf[i] ^= key[i]; +} /* aes_addRoundKey */ + +/* -------------------------------------------------------------------------- */ +static void aes_addRoundKey_cpy(uint8_t *buf, uint8_t const *key, uint8_t *cpk) +{ + register uint8_t i = 16; + + while (i--) buf[i] ^= (cpk[i] = key[i]), cpk[16 + i] = key[16 + i]; /*lint !e687 */ +} /* aes_addRoundKey_cpy */ + + +/* -------------------------------------------------------------------------- */ +static void aes_shiftRows(uint8_t *buf) +{ + register uint8_t i, j; /* to make it potentially parallelable :) */ + + i = buf[1], buf[1] = buf[5], buf[5] = buf[9], buf[9] = buf[13], buf[13] = i; + i = buf[10], buf[10] = buf[2], buf[2] = i; + j = buf[3], buf[3] = buf[15], buf[15] = buf[11], buf[11] = buf[7], buf[7] = j; + j = buf[14], buf[14] = buf[6], buf[6] = j; + +} /* aes_shiftRows */ + +/* -------------------------------------------------------------------------- */ +static void aes_shiftRows_inv(uint8_t *buf) +{ + register uint8_t i, j; /* same as above :) */ + + i = buf[1], buf[1] = buf[13], buf[13] = buf[9], buf[9] = buf[5], buf[5] = i; + i = buf[2], buf[2] = buf[10], buf[10] = i; + j = buf[3], buf[3] = buf[7], buf[7] = buf[11], buf[11] = buf[15], buf[15] = j; + j = buf[6], buf[6] = buf[14], buf[14] = j; + +} /* aes_shiftRows_inv */ + +/* -------------------------------------------------------------------------- */ +static void aes_mixColumns(uint8_t *buf) +{ + register uint8_t i, a, b, c, d, e; + + for (i = 0; i < 16; i += 4) + { + a = buf[i]; + b = buf[i + 1]; + c = buf[i + 2]; + d = buf[i + 3]; + e = a ^ b ^ c ^ d; + buf[i] ^= e ^ rj_xtime(a ^ b); + buf[i + 1] ^= e ^ rj_xtime(b ^ c); + buf[i + 2] ^= e ^ rj_xtime(c ^ d); + buf[i + 3] ^= e ^ rj_xtime(d ^ a); + } +} /* aes_mixColumns */ + +/* -------------------------------------------------------------------------- */ +static void aes_mixColumns_inv(uint8_t *buf) +{ + register uint8_t i, a, b, c, d, e, x, y, z; + + for (i = 0; i < 16; i += 4) + { + a = buf[i]; + b = buf[i + 1]; + c = buf[i + 2]; + d = buf[i + 3]; + e = a ^ b ^ c ^ d; + z = rj_xtime(e); + x = e ^ rj_xtime(rj_xtime(z ^ a ^ c)); + y = e ^ rj_xtime(rj_xtime(z ^ b ^ d)); + buf[i] ^= x ^ rj_xtime(a ^ b); + buf[i + 1] ^= y ^ rj_xtime(b ^ c); + buf[i + 2] ^= x ^ rj_xtime(c ^ d); + buf[i + 3] ^= y ^ rj_xtime(d ^ a); + } +} /* aes_mixColumns_inv */ + +/* -------------------------------------------------------------------------- */ +static void aes_expandEncKey(uint8_t *k, uint8_t *rc) +{ + register uint8_t i; + + k[0] ^= rj_sbox(k[29]) ^ (*rc); + k[1] ^= rj_sbox(k[30]); + k[2] ^= rj_sbox(k[31]); + k[3] ^= rj_sbox(k[28]); + *rc = rj_xtime( *rc); + + for(i = 4; i < 16; i += 4) k[i] ^= k[i - 4], k[i + 1] ^= k[i - 3], + k[i + 2] ^= k[i - 2], k[i + 3] ^= k[i - 1]; /*lint !e687 */ + k[16] ^= rj_sbox(k[12]); + k[17] ^= rj_sbox(k[13]); + k[18] ^= rj_sbox(k[14]); + k[19] ^= rj_sbox(k[15]); + + for(i = 20; i < 32; i += 4) k[i] ^= k[i - 4], k[i + 1] ^= k[i - 3], + k[i + 2] ^= k[i - 2], k[i + 3] ^= k[i - 1]; /*lint !e687 */ + +} /* aes_expandEncKey */ + +/* -------------------------------------------------------------------------- */ +static void aes_expandDecKey(uint8_t *k, uint8_t *rc) +{ + uint8_t i; + + for(i = 28; i > 16; i -= 4) k[i] ^= k[i - 4], k[i + 1] ^= k[i - 3], + k[i + 2] ^= k[i - 2], k[i + 3] ^= k[i - 1]; /*lint !e687 */ + + k[16] ^= rj_sbox(k[12]); + k[17] ^= rj_sbox(k[13]); + k[18] ^= rj_sbox(k[14]); + k[19] ^= rj_sbox(k[15]); + + for(i = 12; i > 0; i -= 4) k[i] ^= k[i - 4], k[i + 1] ^= k[i - 3], + k[i + 2] ^= k[i - 2], k[i + 3] ^= k[i - 1]; /*lint !e687 */ + + *rc = FD(*rc); + k[0] ^= rj_sbox(k[29]) ^ (*rc); + k[1] ^= rj_sbox(k[30]); + k[2] ^= rj_sbox(k[31]); + k[3] ^= rj_sbox(k[28]); +} /* aes_expandDecKey */ + + +/* -------------------------------------------------------------------------- */ +void aes256_init(aes256_context *ctx, uint8_t const *k) +{ + uint8_t rcon = 1; + register uint8_t i; + + for (i = 0; i < sizeof(ctx->key); i++) ctx->enckey[i] = ctx->deckey[i] = k[i]; + for (i = 8; --i;) aes_expandEncKey(ctx->deckey, &rcon); +} /* aes256_init */ + +/* -------------------------------------------------------------------------- */ +void aes256_done(aes256_context *ctx) +{ + register uint8_t i; + + for (i = 0; i < sizeof(ctx->key); i++) + ctx->key[i] = ctx->enckey[i] = ctx->deckey[i] = 0; +} /* aes256_done */ + +/* -------------------------------------------------------------------------- */ +void aes256_encrypt_ecb(aes256_context *ctx, uint8_t *buf) +{ + uint8_t i, rcon; + + aes_addRoundKey_cpy(buf, ctx->enckey, ctx->key); + for(i = 1, rcon = 1; i < 14; ++i) + { + aes_subBytes(buf); + aes_shiftRows(buf); + aes_mixColumns(buf); + if( i & 1 ) aes_addRoundKey( buf, &ctx->key[16]); + else aes_expandEncKey(ctx->key, &rcon), aes_addRoundKey(buf, ctx->key); /*lint !e687 */ + } + aes_subBytes(buf); + aes_shiftRows(buf); + aes_expandEncKey(ctx->key, &rcon); + aes_addRoundKey(buf, ctx->key); +} /* aes256_encrypt */ + +/* -------------------------------------------------------------------------- */ +void aes256_decrypt_ecb(aes256_context *ctx, uint8_t *buf) +{ + uint8_t i, rcon; + + aes_addRoundKey_cpy(buf, ctx->deckey, ctx->key); + aes_shiftRows_inv(buf); + aes_subBytes_inv(buf); + + for (i = 14, rcon = 0x80; --i;) + { + if( ( i & 1 ) ) + { + aes_expandDecKey(ctx->key, &rcon); + aes_addRoundKey(buf, &ctx->key[16]); + } + else aes_addRoundKey(buf, ctx->key); + aes_mixColumns_inv(buf); + aes_shiftRows_inv(buf); + aes_subBytes_inv(buf); + } + aes_addRoundKey( buf, ctx->key); +} /* aes256_decrypt */ diff --git a/Host/Source/LibOpenBLT/aes256.h b/Host/Source/LibOpenBLT/aes256.h new file mode 100755 index 00000000..f420e3ae --- /dev/null +++ b/Host/Source/LibOpenBLT/aes256.h @@ -0,0 +1,39 @@ +/* +* Byte-oriented AES-256 implementation. +* All lookup tables replaced with 'on the fly' calculations. +* +* Copyright (c) 2007-2009 Ilya O. Levin, http://www.literatecode.com +* Other contributors: Hal Finney +* +* Permission to use, copy, modify, and distribute this software for any +* purpose with or without fee is hereby granted, provided that the above +* copyright notice and this permission notice appear in all copies. +* +* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES +* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF +* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR +* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES +* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN +* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF +* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. +*/ + +#ifdef __cplusplus +extern "C" { +#endif + + typedef struct { + uint8_t key[32]; + uint8_t enckey[32]; + uint8_t deckey[32]; + } aes256_context; + + + void aes256_init(aes256_context *, uint8_t const * /* key */); + void aes256_done(aes256_context *); + void aes256_encrypt_ecb(aes256_context *, uint8_t * /* plaintext */); + void aes256_decrypt_ecb(aes256_context *, uint8_t * /* cipertext */); + +#ifdef __cplusplus +} +#endif diff --git a/Host/Source/LibOpenBLT/openblt.c b/Host/Source/LibOpenBLT/openblt.c index a533cefd..3eb00559 100644 --- a/Host/Source/LibOpenBLT/openblt.c +++ b/Host/Source/LibOpenBLT/openblt.c @@ -647,6 +647,74 @@ LIBOPENBLT_EXPORT void BltUtilTimeDelayMs(uint16_t delay) } /*** end of BltUtilTimeDelayMs ***/ +/************************************************************************************//** +** \brief Encrypts the len-bytes in the specified data-array, using the specified +** 256-bit (32 bytes) key. The results are written back into the same array. +** \param data Pointer to the byte array with data to encrypt. The encrypted bytes +** are stored in the same array. +** \param len The number of bytes in the data-array to encrypt. It must be a multiple +** of 16, as this is the AES256 minimal block size. +** \param key The 256-bit encryption key as a array of 32 bytes. +** \return BLT_RESULT_OK if successful, BLT_RESULT_ERROR_xxx otherwise. +** +****************************************************************************************/ +LIBOPENBLT_EXPORT uint32_t BltUtilCryptoAes256Encrypt(uint8_t * data, uint32_t len, + uint8_t const * key) +{ + uint32_t result = BLT_RESULT_ERROR_GENERIC; + + /* Check parameters */ + assert(data != NULL); + assert(key != NULL); + + /* Only continue with valid parameters. Also add a block size check for 'len'. */ + if ( (data != NULL) && (key != NULL) && ((len % 16u) == 0) ) /*lint !e774 */ + { + /* Pass the request on to the utility module. */ + if (UtilCryptoAes256Encrypt(data, len, key)) + { + result = BLT_RESULT_OK; + } + } + /* Give the result back to the caller. */ + return result; +} /*** end of BltUtilCryptoAes256Encrypt ***/ + + +/************************************************************************************//** +** \brief Decrypts the len-bytes in the specified data-array, using the specified 256- +** bit (32 bytes) key. The results are written back into the same array. +** \param data Pointer to the byte array with data to decrypt. The decrypted bytes +** are stored in the same array. +** \param len The number of bytes in the data-array to decrypt. It must be a multiple +** of 16, as this is the AES256 minimal block size. +** \param key The 256-bit decryption key as a array of 32 bytes. +** \return BLT_RESULT_OK if successful, BLT_RESULT_ERROR_xxx otherwise. +** +****************************************************************************************/ +LIBOPENBLT_EXPORT uint32_t BltUtilCryptoAes256Decrypt(uint8_t * data, uint32_t len, + uint8_t const * key) +{ + uint32_t result = BLT_RESULT_ERROR_GENERIC; + + /* Check parameters */ + assert(data != NULL); + assert(key != NULL); + + /* Only continue with valid parameters. Also add a block size check for 'len'. */ + if ( (data != NULL) && (key != NULL) && ((len % 16u) == 0) ) /*lint !e774 */ + { + /* Pass the request on to the utility module. */ + if (UtilCryptoAes256Decrypt(data, len, key)) + { + result = BLT_RESULT_OK; + } + } + /* Give the result back to the caller. */ + return result; +} /*** end of BltUtilCryptoAes256Decrypt ***/ + + /*********************************** end of openblt.c **********************************/ diff --git a/Host/Source/LibOpenBLT/openblt.h b/Host/Source/LibOpenBLT/openblt.h index 467fe366..dba3bdad 100644 --- a/Host/Source/LibOpenBLT/openblt.h +++ b/Host/Source/LibOpenBLT/openblt.h @@ -213,6 +213,10 @@ LIBOPENBLT_EXPORT uint16_t BltUtilCrc16Calculate(uint8_t const * data, uint32_t LIBOPENBLT_EXPORT uint32_t BltUtilCrc32Calculate(uint8_t const * data, uint32_t len); LIBOPENBLT_EXPORT uint32_t BltUtilTimeGetSystemTime(void); LIBOPENBLT_EXPORT void BltUtilTimeDelayMs(uint16_t delay); +LIBOPENBLT_EXPORT uint32_t BltUtilCryptoAes256Encrypt(uint8_t * data, uint32_t len, + uint8_t const * key); +LIBOPENBLT_EXPORT uint32_t BltUtilCryptoAes256Decrypt(uint8_t * data, uint32_t len, + uint8_t const * key); #ifdef __cplusplus diff --git a/Host/Source/LibOpenBLT/openblt.pas b/Host/Source/LibOpenBLT/openblt.pas index 3e56ea8e..f21073f9 100644 --- a/Host/Source/LibOpenBLT/openblt.pas +++ b/Host/Source/LibOpenBLT/openblt.pas @@ -162,6 +162,10 @@ function BltUtilCrc32Calculate(data: PByte; len: LongWord): LongWord; cdecl; external LIBOPENBLT_LIBNAME; function BltUtilTimeGetSystemTime: LongWord; cdecl; external LIBOPENBLT_LIBNAME; procedure BltUtilTimeDelayMs(delay: Word); cdecl; external LIBOPENBLT_LIBNAME; +function BltUtilCryptoAes256Encrypt(data: PByte; len: LongWord; key: PByte): LongWord; + cdecl; external LIBOPENBLT_LIBNAME; +function BltUtilCryptoAes256Decrypt(data: PByte; len: LongWord; key: PByte): LongWord; + cdecl; external LIBOPENBLT_LIBNAME; implementation diff --git a/Host/Source/LibOpenBLT/util.c b/Host/Source/LibOpenBLT/util.c index c0e2ce94..a02f0e5a 100644 --- a/Host/Source/LibOpenBLT/util.c +++ b/Host/Source/LibOpenBLT/util.c @@ -35,6 +35,7 @@ #include /* for boolean type */ #include /* for string library */ #include "util.h" /* Utility module */ +#include "aes256.h" /* for AES256 cryptography. */ /**************************************************************************************** @@ -252,6 +253,86 @@ bool UtilFileExtractFilename(char const * fullFilename, char * filenameBuffer) } /*** end of UtilFileExtractFilename ***/ +/************************************************************************************//** +** \brief Encrypts the len-bytes in the specified data-array, using the specified +** 256-bit (32 bytes) key. The results are written back into the same array. +** \param data Pointer to the byte array with data to encrypt. The encrypted bytes +** are stored in the same array. +** \param len The number of bytes in the data-array to encrypt. It must be a multiple +** of 16, as this is the AES256 minimal block size. +** \param key The 256-bit encryption key as a array of 32 bytes. +** \return True if successful, false otherwise. +** +****************************************************************************************/ +bool UtilCryptoAes256Encrypt(uint8_t * data, uint32_t len, uint8_t const * key) +{ + bool result = false; + aes256_context ctx; + + /* Check parameters */ + assert(data != NULL); + assert(key != NULL); + + /* Only continue with valid parameters. Also add a block size check for 'len'. */ + if ( (data != NULL) && (key != NULL) && ((len % 16u) == 0) ) /*lint !e774 */ + { + /* Init context */ + aes256_init(&ctx, key); + /* Encrypt in blocks of 16 bytes. */ + for (uint32_t i = 0; i < (len / 16u); i++) + { + aes256_encrypt_ecb(&ctx, &data[i * 16u]); + } + /* Cleanup */ + aes256_done(&ctx); + /* Set positive result. */ + result = true; + } + /* Give the result back to the caller. */ + return result; +} /*** end of UtilCryptoAes256Encrypt ***/ + + +/************************************************************************************//** +** \brief Decrypts the len-bytes in the specified data-array, using the specified 256- +** bit (32 bytes) key. The results are written back into the same array. +** \param data Pointer to the byte array with data to decrypt. The decrypted bytes +** are stored in the same array. +** \param len The number of bytes in the data-array to decrypt. It must be a multiple +** of 16, as this is the AES256 minimal block size. +** \param key The 256-bit decryption key as a array of 32 bytes. +** \return True if successful, false otherwise. +** +****************************************************************************************/ +bool UtilCryptoAes256Decrypt(uint8_t * data, uint32_t len, uint8_t const * key) +{ + bool result = false; + aes256_context ctx; + + /* Check parameters */ + assert(data != NULL); + assert(key != NULL); + + /* Only continue with valid parameters. Also add a block size check for 'len'. */ + if ( (data != NULL) && (key != NULL) && ((len % 16u) == 0) ) /*lint !e774 */ + { + /* Init context */ + aes256_init(&ctx, key); + /* Decrypt in blocks of 16 bytes. */ + for (uint32_t i = 0; i < (len / 16u); i++) + { + aes256_decrypt_ecb(&ctx, &data[i * 16u]); + } + /* Cleanup */ + aes256_done(&ctx); + /* Set positive result. */ + result = true; + } + /* Give the result back to the caller. */ + return result; +} /*** end of UtilCryptoAes256Decrypt ***/ + + /*********************************** end of util.c *************************************/ diff --git a/Host/Source/LibOpenBLT/util.h b/Host/Source/LibOpenBLT/util.h index 56ffb062..0520b882 100644 --- a/Host/Source/LibOpenBLT/util.h +++ b/Host/Source/LibOpenBLT/util.h @@ -53,6 +53,8 @@ void UtilCriticalSectionInit(void); void UtilCriticalSectionTerminate(void); void UtilCriticalSectionEnter(void); void UtilCriticalSectionExit(void); +bool UtilCryptoAes256Encrypt(uint8_t * data, uint32_t len, uint8_t const * key); +bool UtilCryptoAes256Decrypt(uint8_t * data, uint32_t len, uint8_t const * key); #ifdef __cplusplus