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test aes_xts decryption
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570
source/keys/aes.c
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570
source/keys/aes.c
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/*
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This is an implementation of the AES algorithm, specifically ECB, CTR and CBC mode.
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Block size can be chosen in aes.h - available choices are AES128, AES192, AES256.
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The implementation is verified against the test vectors in:
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National Institute of Standards and Technology Special Publication 800-38A 2001 ED
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ECB-AES128
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----------
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plain-text:
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6bc1bee22e409f96e93d7e117393172a
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ae2d8a571e03ac9c9eb76fac45af8e51
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30c81c46a35ce411e5fbc1191a0a52ef
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f69f2445df4f9b17ad2b417be66c3710
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key:
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2b7e151628aed2a6abf7158809cf4f3c
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resulting cipher
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3ad77bb40d7a3660a89ecaf32466ef97
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f5d3d58503b9699de785895a96fdbaaf
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43b1cd7f598ece23881b00e3ed030688
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7b0c785e27e8ad3f8223207104725dd4
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NOTE: String length must be evenly divisible by 16byte (str_len % 16 == 0)
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You should pad the end of the string with zeros if this is not the case.
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For AES192/256 the key size is proportionally larger.
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*/
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/*****************************************************************************/
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/* Includes: */
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/*****************************************************************************/
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#include <stdint.h>
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#include <string.h> // CBC mode, for memset
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#include "aes.h"
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/*****************************************************************************/
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/* Defines: */
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/*****************************************************************************/
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// The number of columns comprising a state in AES. This is a constant in AES. Value=4
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#define Nb 4
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#if defined(AES256) && (AES256 == 1)
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#define Nk 8
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#define Nr 14
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#elif defined(AES192) && (AES192 == 1)
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#define Nk 6
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#define Nr 12
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#else
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#define Nk 4 // The number of 32 bit words in a key.
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#define Nr 10 // The number of rounds in AES Cipher.
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#endif
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// jcallan@github points out that declaring Multiply as a function
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// reduces code size considerably with the Keil ARM compiler.
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// See this link for more information: https://github.com/kokke/tiny-AES-C/pull/3
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#ifndef MULTIPLY_AS_A_FUNCTION
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#define MULTIPLY_AS_A_FUNCTION 0
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#endif
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/*****************************************************************************/
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/* Private variables: */
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/*****************************************************************************/
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// state - array holding the intermediate results during decryption.
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typedef uint8_t state_t[4][4];
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// The lookup-tables are marked const so they can be placed in read-only storage instead of RAM
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// The numbers below can be computed dynamically trading ROM for RAM -
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// This can be useful in (embedded) bootloader applications, where ROM is often limited.
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static const uint8_t sbox[256] = {
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//0 1 2 3 4 5 6 7 8 9 A B C D E F
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0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
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0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
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0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
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0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
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0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
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0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
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0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
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0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
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0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
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0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
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0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
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0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
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0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
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0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
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0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
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0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 };
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static const uint8_t rsbox[256] = {
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0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,
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0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,
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0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,
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0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25,
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0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92,
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0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,
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0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06,
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0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b,
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0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,
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0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e,
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0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,
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0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,
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0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,
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0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,
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0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
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0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d };
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// The round constant word array, Rcon[i], contains the values given by
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// x to the power (i-1) being powers of x (x is denoted as {02}) in the field GF(2^8)
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static const uint8_t Rcon[11] = {
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0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36 };
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/*
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* Jordan Goulder points out in PR #12 (https://github.com/kokke/tiny-AES-C/pull/12),
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* that you can remove most of the elements in the Rcon array, because they are unused.
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*
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* From Wikipedia's article on the Rijndael key schedule @ https://en.wikipedia.org/wiki/Rijndael_key_schedule#Rcon
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*
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* "Only the first some of these constants are actually used – up to rcon[10] for AES-128 (as 11 round keys are needed),
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* up to rcon[8] for AES-192, up to rcon[7] for AES-256. rcon[0] is not used in AES algorithm."
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*/
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/*****************************************************************************/
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/* Private functions: */
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/*****************************************************************************/
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/*
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static uint8_t getSBoxValue(uint8_t num)
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{
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return sbox[num];
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}
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*/
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#define getSBoxValue(num) (sbox[(num)])
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/*
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static uint8_t getSBoxInvert(uint8_t num)
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{
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return rsbox[num];
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}
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*/
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#define getSBoxInvert(num) (rsbox[(num)])
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// This function produces Nb(Nr+1) round keys. The round keys are used in each round to decrypt the states.
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static void KeyExpansion(uint8_t* RoundKey, const uint8_t* Key)
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{
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unsigned i, j, k;
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uint8_t tempa[4]; // Used for the column/row operations
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// The first round key is the key itself.
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for (i = 0; i < Nk; ++i)
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{
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RoundKey[(i * 4) + 0] = Key[(i * 4) + 0];
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RoundKey[(i * 4) + 1] = Key[(i * 4) + 1];
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RoundKey[(i * 4) + 2] = Key[(i * 4) + 2];
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RoundKey[(i * 4) + 3] = Key[(i * 4) + 3];
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}
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// All other round keys are found from the previous round keys.
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for (i = Nk; i < Nb * (Nr + 1); ++i)
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{
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{
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k = (i - 1) * 4;
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tempa[0]=RoundKey[k + 0];
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tempa[1]=RoundKey[k + 1];
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tempa[2]=RoundKey[k + 2];
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tempa[3]=RoundKey[k + 3];
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}
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if (i % Nk == 0)
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{
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// This function shifts the 4 bytes in a word to the left once.
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// [a0,a1,a2,a3] becomes [a1,a2,a3,a0]
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// Function RotWord()
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{
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k = tempa[0];
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tempa[0] = tempa[1];
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tempa[1] = tempa[2];
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tempa[2] = tempa[3];
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tempa[3] = k;
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}
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// SubWord() is a function that takes a four-byte input word and
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// applies the S-box to each of the four bytes to produce an output word.
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// Function Subword()
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{
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tempa[0] = getSBoxValue(tempa[0]);
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tempa[1] = getSBoxValue(tempa[1]);
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tempa[2] = getSBoxValue(tempa[2]);
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tempa[3] = getSBoxValue(tempa[3]);
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}
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tempa[0] = tempa[0] ^ Rcon[i/Nk];
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}
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#if defined(AES256) && (AES256 == 1)
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if (i % Nk == 4)
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{
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// Function Subword()
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{
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tempa[0] = getSBoxValue(tempa[0]);
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tempa[1] = getSBoxValue(tempa[1]);
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tempa[2] = getSBoxValue(tempa[2]);
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tempa[3] = getSBoxValue(tempa[3]);
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}
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}
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#endif
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j = i * 4; k=(i - Nk) * 4;
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RoundKey[j + 0] = RoundKey[k + 0] ^ tempa[0];
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RoundKey[j + 1] = RoundKey[k + 1] ^ tempa[1];
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RoundKey[j + 2] = RoundKey[k + 2] ^ tempa[2];
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RoundKey[j + 3] = RoundKey[k + 3] ^ tempa[3];
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}
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}
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void AES_init_ctx(struct AES_ctx* ctx, const uint8_t* key)
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{
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KeyExpansion(ctx->RoundKey, key);
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}
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#if (defined(CBC) && (CBC == 1)) || (defined(CTR) && (CTR == 1))
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void AES_init_ctx_iv(struct AES_ctx* ctx, const uint8_t* key, const uint8_t* iv)
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{
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KeyExpansion(ctx->RoundKey, key);
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memcpy (ctx->Iv, iv, AES_BLOCKLEN);
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}
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void AES_ctx_set_iv(struct AES_ctx* ctx, const uint8_t* iv)
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{
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memcpy (ctx->Iv, iv, AES_BLOCKLEN);
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}
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#endif
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// This function adds the round key to state.
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// The round key is added to the state by an XOR function.
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static void AddRoundKey(uint8_t round,state_t* state,uint8_t* RoundKey)
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{
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uint8_t i,j;
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for (i = 0; i < 4; ++i)
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{
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for (j = 0; j < 4; ++j)
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{
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(*state)[i][j] ^= RoundKey[(round * Nb * 4) + (i * Nb) + j];
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}
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}
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}
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// The SubBytes Function Substitutes the values in the
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// state matrix with values in an S-box.
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static void SubBytes(state_t* state)
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{
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uint8_t i, j;
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for (i = 0; i < 4; ++i)
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{
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for (j = 0; j < 4; ++j)
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{
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(*state)[j][i] = getSBoxValue((*state)[j][i]);
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}
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}
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}
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// The ShiftRows() function shifts the rows in the state to the left.
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// Each row is shifted with different offset.
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// Offset = Row number. So the first row is not shifted.
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static void ShiftRows(state_t* state)
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{
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uint8_t temp;
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// Rotate first row 1 columns to left
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temp = (*state)[0][1];
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(*state)[0][1] = (*state)[1][1];
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(*state)[1][1] = (*state)[2][1];
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(*state)[2][1] = (*state)[3][1];
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(*state)[3][1] = temp;
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// Rotate second row 2 columns to left
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temp = (*state)[0][2];
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(*state)[0][2] = (*state)[2][2];
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(*state)[2][2] = temp;
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temp = (*state)[1][2];
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(*state)[1][2] = (*state)[3][2];
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(*state)[3][2] = temp;
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// Rotate third row 3 columns to left
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temp = (*state)[0][3];
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(*state)[0][3] = (*state)[3][3];
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(*state)[3][3] = (*state)[2][3];
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(*state)[2][3] = (*state)[1][3];
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(*state)[1][3] = temp;
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}
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static uint8_t xtime(uint8_t x)
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{
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return ((x<<1) ^ (((x>>7) & 1) * 0x1b));
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}
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// MixColumns function mixes the columns of the state matrix
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static void MixColumns(state_t* state)
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{
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uint8_t i;
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uint8_t Tmp, Tm, t;
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for (i = 0; i < 4; ++i)
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{
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t = (*state)[i][0];
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Tmp = (*state)[i][0] ^ (*state)[i][1] ^ (*state)[i][2] ^ (*state)[i][3] ;
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Tm = (*state)[i][0] ^ (*state)[i][1] ; Tm = xtime(Tm); (*state)[i][0] ^= Tm ^ Tmp ;
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Tm = (*state)[i][1] ^ (*state)[i][2] ; Tm = xtime(Tm); (*state)[i][1] ^= Tm ^ Tmp ;
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Tm = (*state)[i][2] ^ (*state)[i][3] ; Tm = xtime(Tm); (*state)[i][2] ^= Tm ^ Tmp ;
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Tm = (*state)[i][3] ^ t ; Tm = xtime(Tm); (*state)[i][3] ^= Tm ^ Tmp ;
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}
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}
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// Multiply is used to multiply numbers in the field GF(2^8)
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// Note: The last call to xtime() is unneeded, but often ends up generating a smaller binary
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// The compiler seems to be able to vectorize the operation better this way.
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// See https://github.com/kokke/tiny-AES-c/pull/34
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#if MULTIPLY_AS_A_FUNCTION
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static uint8_t Multiply(uint8_t x, uint8_t y)
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{
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return (((y & 1) * x) ^
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((y>>1 & 1) * xtime(x)) ^
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((y>>2 & 1) * xtime(xtime(x))) ^
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((y>>3 & 1) * xtime(xtime(xtime(x)))) ^
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((y>>4 & 1) * xtime(xtime(xtime(xtime(x)))))); /* this last call to xtime() can be omitted */
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}
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#else
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#define Multiply(x, y) \
|
||||
( ((y & 1) * x) ^ \
|
||||
((y>>1 & 1) * xtime(x)) ^ \
|
||||
((y>>2 & 1) * xtime(xtime(x))) ^ \
|
||||
((y>>3 & 1) * xtime(xtime(xtime(x)))) ^ \
|
||||
((y>>4 & 1) * xtime(xtime(xtime(xtime(x)))))) \
|
||||
|
||||
#endif
|
||||
|
||||
// MixColumns function mixes the columns of the state matrix.
|
||||
// The method used to multiply may be difficult to understand for the inexperienced.
|
||||
// Please use the references to gain more information.
|
||||
static void InvMixColumns(state_t* state)
|
||||
{
|
||||
int i;
|
||||
uint8_t a, b, c, d;
|
||||
for (i = 0; i < 4; ++i)
|
||||
{
|
||||
a = (*state)[i][0];
|
||||
b = (*state)[i][1];
|
||||
c = (*state)[i][2];
|
||||
d = (*state)[i][3];
|
||||
|
||||
(*state)[i][0] = Multiply(a, 0x0e) ^ Multiply(b, 0x0b) ^ Multiply(c, 0x0d) ^ Multiply(d, 0x09);
|
||||
(*state)[i][1] = Multiply(a, 0x09) ^ Multiply(b, 0x0e) ^ Multiply(c, 0x0b) ^ Multiply(d, 0x0d);
|
||||
(*state)[i][2] = Multiply(a, 0x0d) ^ Multiply(b, 0x09) ^ Multiply(c, 0x0e) ^ Multiply(d, 0x0b);
|
||||
(*state)[i][3] = Multiply(a, 0x0b) ^ Multiply(b, 0x0d) ^ Multiply(c, 0x09) ^ Multiply(d, 0x0e);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
// The SubBytes Function Substitutes the values in the
|
||||
// state matrix with values in an S-box.
|
||||
static void InvSubBytes(state_t* state)
|
||||
{
|
||||
uint8_t i, j;
|
||||
for (i = 0; i < 4; ++i)
|
||||
{
|
||||
for (j = 0; j < 4; ++j)
|
||||
{
|
||||
(*state)[j][i] = getSBoxInvert((*state)[j][i]);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static void InvShiftRows(state_t* state)
|
||||
{
|
||||
uint8_t temp;
|
||||
|
||||
// Rotate first row 1 columns to right
|
||||
temp = (*state)[3][1];
|
||||
(*state)[3][1] = (*state)[2][1];
|
||||
(*state)[2][1] = (*state)[1][1];
|
||||
(*state)[1][1] = (*state)[0][1];
|
||||
(*state)[0][1] = temp;
|
||||
|
||||
// Rotate second row 2 columns to right
|
||||
temp = (*state)[0][2];
|
||||
(*state)[0][2] = (*state)[2][2];
|
||||
(*state)[2][2] = temp;
|
||||
|
||||
temp = (*state)[1][2];
|
||||
(*state)[1][2] = (*state)[3][2];
|
||||
(*state)[3][2] = temp;
|
||||
|
||||
// Rotate third row 3 columns to right
|
||||
temp = (*state)[0][3];
|
||||
(*state)[0][3] = (*state)[1][3];
|
||||
(*state)[1][3] = (*state)[2][3];
|
||||
(*state)[2][3] = (*state)[3][3];
|
||||
(*state)[3][3] = temp;
|
||||
}
|
||||
|
||||
|
||||
// Cipher is the main function that encrypts the PlainText.
|
||||
static void Cipher(state_t* state, uint8_t* RoundKey)
|
||||
{
|
||||
uint8_t round = 0;
|
||||
|
||||
// Add the First round key to the state before starting the rounds.
|
||||
AddRoundKey(0, state, RoundKey);
|
||||
|
||||
// There will be Nr rounds.
|
||||
// The first Nr-1 rounds are identical.
|
||||
// These Nr-1 rounds are executed in the loop below.
|
||||
for (round = 1; round < Nr; ++round)
|
||||
{
|
||||
SubBytes(state);
|
||||
ShiftRows(state);
|
||||
MixColumns(state);
|
||||
AddRoundKey(round, state, RoundKey);
|
||||
}
|
||||
|
||||
// The last round is given below.
|
||||
// The MixColumns function is not here in the last round.
|
||||
SubBytes(state);
|
||||
ShiftRows(state);
|
||||
AddRoundKey(Nr, state, RoundKey);
|
||||
}
|
||||
|
||||
static void InvCipher(state_t* state,uint8_t* RoundKey)
|
||||
{
|
||||
uint8_t round = 0;
|
||||
|
||||
// Add the First round key to the state before starting the rounds.
|
||||
AddRoundKey(Nr, state, RoundKey);
|
||||
|
||||
// There will be Nr rounds.
|
||||
// The first Nr-1 rounds are identical.
|
||||
// These Nr-1 rounds are executed in the loop below.
|
||||
for (round = (Nr - 1); round > 0; --round)
|
||||
{
|
||||
InvShiftRows(state);
|
||||
InvSubBytes(state);
|
||||
AddRoundKey(round, state, RoundKey);
|
||||
InvMixColumns(state);
|
||||
}
|
||||
|
||||
// The last round is given below.
|
||||
// The MixColumns function is not here in the last round.
|
||||
InvShiftRows(state);
|
||||
InvSubBytes(state);
|
||||
AddRoundKey(0, state, RoundKey);
|
||||
}
|
||||
|
||||
|
||||
/*****************************************************************************/
|
||||
/* Public functions: */
|
||||
/*****************************************************************************/
|
||||
#if defined(ECB) && (ECB == 1)
|
||||
|
||||
|
||||
void AES_ECB_encrypt(struct AES_ctx *ctx,const uint8_t* buf)
|
||||
{
|
||||
// The next function call encrypts the PlainText with the Key using AES algorithm.
|
||||
Cipher((state_t*)buf, ctx->RoundKey);
|
||||
}
|
||||
|
||||
void AES_ECB_decrypt(struct AES_ctx* ctx,const uint8_t* buf)
|
||||
{
|
||||
// The next function call decrypts the PlainText with the Key using AES algorithm.
|
||||
InvCipher((state_t*)buf, ctx->RoundKey);
|
||||
}
|
||||
|
||||
|
||||
#endif // #if defined(ECB) && (ECB == 1)
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
#if defined(CBC) && (CBC == 1)
|
||||
|
||||
|
||||
static void XorWithIv(uint8_t* buf, uint8_t* Iv)
|
||||
{
|
||||
uint8_t i;
|
||||
for (i = 0; i < AES_BLOCKLEN; ++i) // The block in AES is always 128bit no matter the key size
|
||||
{
|
||||
buf[i] ^= Iv[i];
|
||||
}
|
||||
}
|
||||
|
||||
void AES_CBC_encrypt_buffer(struct AES_ctx *ctx,uint8_t* buf, uint32_t length)
|
||||
{
|
||||
uintptr_t i;
|
||||
uint8_t *Iv = ctx->Iv;
|
||||
for (i = 0; i < length; i += AES_BLOCKLEN)
|
||||
{
|
||||
XorWithIv(buf, Iv);
|
||||
Cipher((state_t*)buf, ctx->RoundKey);
|
||||
Iv = buf;
|
||||
buf += AES_BLOCKLEN;
|
||||
//printf("Step %d - %d", i/16, i);
|
||||
}
|
||||
/* store Iv in ctx for next call */
|
||||
memcpy(ctx->Iv, Iv, AES_BLOCKLEN);
|
||||
}
|
||||
|
||||
void AES_CBC_decrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, uint32_t length)
|
||||
{
|
||||
uintptr_t i;
|
||||
uint8_t storeNextIv[AES_BLOCKLEN];
|
||||
for (i = 0; i < length; i += AES_BLOCKLEN)
|
||||
{
|
||||
memcpy(storeNextIv, buf, AES_BLOCKLEN);
|
||||
InvCipher((state_t*)buf, ctx->RoundKey);
|
||||
XorWithIv(buf, ctx->Iv);
|
||||
memcpy(ctx->Iv, storeNextIv, AES_BLOCKLEN);
|
||||
buf += AES_BLOCKLEN;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
#endif // #if defined(CBC) && (CBC == 1)
|
||||
|
||||
|
||||
|
||||
#if defined(CTR) && (CTR == 1)
|
||||
|
||||
/* Symmetrical operation: same function for encrypting as for decrypting. Note any IV/nonce should never be reused with the same key */
|
||||
void AES_CTR_xcrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, uint32_t length)
|
||||
{
|
||||
uint8_t buffer[AES_BLOCKLEN];
|
||||
|
||||
unsigned i;
|
||||
int bi;
|
||||
for (i = 0, bi = AES_BLOCKLEN; i < length; ++i, ++bi)
|
||||
{
|
||||
if (bi == AES_BLOCKLEN) /* we need to regen xor compliment in buffer */
|
||||
{
|
||||
|
||||
memcpy(buffer, ctx->Iv, AES_BLOCKLEN);
|
||||
Cipher((state_t*)buffer,ctx->RoundKey);
|
||||
|
||||
/* Increment Iv and handle overflow */
|
||||
for (bi = (AES_BLOCKLEN - 1); bi >= 0; --bi)
|
||||
{
|
||||
/* inc will owerflow */
|
||||
if (ctx->Iv[bi] == 255)
|
||||
{
|
||||
ctx->Iv[bi] = 0;
|
||||
continue;
|
||||
}
|
||||
ctx->Iv[bi] += 1;
|
||||
break;
|
||||
}
|
||||
bi = 0;
|
||||
}
|
||||
|
||||
buf[i] = (buf[i] ^ buffer[bi]);
|
||||
}
|
||||
}
|
||||
|
||||
#endif // #if defined(CTR) && (CTR == 1)
|
||||
|
90
source/keys/aes.h
Normal file
90
source/keys/aes.h
Normal file
|
@ -0,0 +1,90 @@
|
|||
#ifndef _AES_H_
|
||||
#define _AES_H_
|
||||
|
||||
#include <stdint.h>
|
||||
|
||||
// #define the macros below to 1/0 to enable/disable the mode of operation.
|
||||
//
|
||||
// CBC enables AES encryption in CBC-mode of operation.
|
||||
// CTR enables encryption in counter-mode.
|
||||
// ECB enables the basic ECB 16-byte block algorithm. All can be enabled simultaneously.
|
||||
|
||||
// The #ifndef-guard allows it to be configured before #include'ing or at compile time.
|
||||
#ifndef CBC
|
||||
#define CBC 1
|
||||
#endif
|
||||
|
||||
#ifndef ECB
|
||||
#define ECB 1
|
||||
#endif
|
||||
|
||||
#ifndef CTR
|
||||
#define CTR 1
|
||||
#endif
|
||||
|
||||
|
||||
#define AES128 1
|
||||
//#define AES192 1
|
||||
//#define AES256 1
|
||||
|
||||
#define AES_BLOCKLEN 16 //Block length in bytes AES is 128b block only
|
||||
|
||||
#if defined(AES256) && (AES256 == 1)
|
||||
#define AES_KEYLEN 32
|
||||
#define AES_keyExpSize 240
|
||||
#elif defined(AES192) && (AES192 == 1)
|
||||
#define AES_KEYLEN 24
|
||||
#define AES_keyExpSize 208
|
||||
#else
|
||||
#define AES_KEYLEN 16 // Key length in bytes
|
||||
#define AES_keyExpSize 176
|
||||
#endif
|
||||
|
||||
struct AES_ctx
|
||||
{
|
||||
uint8_t RoundKey[AES_keyExpSize];
|
||||
#if (defined(CBC) && (CBC == 1)) || (defined(CTR) && (CTR == 1))
|
||||
uint8_t Iv[AES_BLOCKLEN];
|
||||
#endif
|
||||
};
|
||||
|
||||
void AES_init_ctx(struct AES_ctx* ctx, const uint8_t* key);
|
||||
#if (defined(CBC) && (CBC == 1)) || (defined(CTR) && (CTR == 1))
|
||||
void AES_init_ctx_iv(struct AES_ctx* ctx, const uint8_t* key, const uint8_t* iv);
|
||||
void AES_ctx_set_iv(struct AES_ctx* ctx, const uint8_t* iv);
|
||||
#endif
|
||||
|
||||
#if defined(ECB) && (ECB == 1)
|
||||
// buffer size is exactly AES_BLOCKLEN bytes;
|
||||
// you need only AES_init_ctx as IV is not used in ECB
|
||||
// NB: ECB is considered insecure for most uses
|
||||
void AES_ECB_encrypt(struct AES_ctx* ctx, const uint8_t* buf);
|
||||
void AES_ECB_decrypt(struct AES_ctx* ctx, const uint8_t* buf);
|
||||
|
||||
#endif // #if defined(ECB) && (ECB == !)
|
||||
|
||||
|
||||
#if defined(CBC) && (CBC == 1)
|
||||
// buffer size MUST be mutile of AES_BLOCKLEN;
|
||||
// Suggest https://en.wikipedia.org/wiki/Padding_(cryptography)#PKCS7 for padding scheme
|
||||
// NOTES: you need to set IV in ctx via AES_init_ctx_iv() or AES_ctx_set_iv()
|
||||
// no IV should ever be reused with the same key
|
||||
void AES_CBC_encrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, uint32_t length);
|
||||
void AES_CBC_decrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, uint32_t length);
|
||||
|
||||
#endif // #if defined(CBC) && (CBC == 1)
|
||||
|
||||
|
||||
#if defined(CTR) && (CTR == 1)
|
||||
|
||||
// Same function for encrypting as for decrypting.
|
||||
// IV is incremented for every block, and used after encryption as XOR-compliment for output
|
||||
// Suggesting https://en.wikipedia.org/wiki/Padding_(cryptography)#PKCS7 for padding scheme
|
||||
// NOTES: you need to set IV in ctx with AES_init_ctx_iv() or AES_ctx_set_iv()
|
||||
// no IV should ever be reused with the same key
|
||||
void AES_CTR_xcrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, uint32_t length);
|
||||
|
||||
#endif // #if defined(CTR) && (CTR == 1)
|
||||
|
||||
|
||||
#endif //_AES_H_
|
61
source/keys/ccrypto.c
Normal file
61
source/keys/ccrypto.c
Normal file
|
@ -0,0 +1,61 @@
|
|||
|
||||
|
||||
#define ECB 1
|
||||
#define CBC 0
|
||||
#define CTR 0
|
||||
|
||||
#include "ccrypto.h"
|
||||
#include "aes.h"
|
||||
|
||||
|
||||
void
|
||||
aes_xtsn_decrypt(u8 *buffer, u64 len, u8 *key, u8 *tweakin, u64 sectoroffsethi, u64 sectoroffsetlo, u32 sector_size) {
|
||||
u64 i;
|
||||
struct AES_ctx _key, _tweak;
|
||||
AES_init_ctx(&_key, key);
|
||||
AES_init_ctx(&_tweak, tweakin);
|
||||
u64 position[2] = {sectoroffsetlo, sectoroffsethi};
|
||||
|
||||
for (i = 0; i < (len / (u64) sector_size); i++) {
|
||||
union bigint128 tweak = geniv(position);
|
||||
AES_ECB_encrypt(&_tweak, tweak.value8);
|
||||
unsigned int j;
|
||||
for (j = 0; j < sector_size / 16; j++) {
|
||||
xor128((u64 *) buffer, tweak.value64);
|
||||
AES_ECB_decrypt(&_key, buffer);
|
||||
xor128((u64 *) buffer, tweak.value64);
|
||||
int flag = tweak.value8[15] & 0x80;
|
||||
shift128(tweak.value8);
|
||||
if (flag) tweak.value8[0] ^= 0x87;
|
||||
buffer += 16;
|
||||
}
|
||||
if (position[0] > (position[0] + 1LLU)) position[1] += 1LLU; //if overflow, we gotta
|
||||
position[0] += 1LLU;
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
aes_xtsn_encrypt(u8 *buffer, u64 len, u8 *key, u8 *tweakin, u64 sectoroffsethi, u64 sectoroffsetlo, u32 sector_size) {
|
||||
u64 i;
|
||||
struct AES_ctx _key, _tweak;
|
||||
AES_init_ctx(&_key, key);
|
||||
AES_init_ctx(&_tweak, tweakin);
|
||||
u64 position[2] = {sectoroffsetlo, sectoroffsethi};
|
||||
|
||||
for (i = 0; i < (len / (u64) sector_size); i++) {
|
||||
union bigint128 tweak = geniv(position);
|
||||
AES_ECB_encrypt(&_tweak, tweak.value8);
|
||||
unsigned int j;
|
||||
for (j = 0; j < sector_size / 16; j++) {
|
||||
xor128((u64 *) buffer, tweak.value64);
|
||||
AES_ECB_encrypt(&_key, buffer);
|
||||
xor128((u64 *) buffer, tweak.value64);
|
||||
int flag = tweak.value8[15] & 0x80;
|
||||
shift128(tweak.value8);
|
||||
if (flag) tweak.value8[0] ^= 0x87;
|
||||
buffer += 16;
|
||||
}
|
||||
if (position[0] > (position[0] + 1LLU)) position[1] += 1LLU; //if overflow, we gotta
|
||||
position[0] += 1LLU;
|
||||
}
|
||||
}
|
92
source/keys/ccrypto.h
Normal file
92
source/keys/ccrypto.h
Normal file
|
@ -0,0 +1,92 @@
|
|||
#ifndef _CCRYPTO_H_
|
||||
#define _CCRYPTO_H_
|
||||
|
||||
//#include <stdlib.h>
|
||||
//#include <stdio.h>
|
||||
// #include <inttypes.h>
|
||||
// #include <stdlib.h>
|
||||
// #include <string.h>
|
||||
// #include <stdbool.h>
|
||||
#include "../utils/types.h"
|
||||
|
||||
// typedef uint8_t u8;
|
||||
// typedef uint16_t u16;
|
||||
// typedef uint32_t u32;
|
||||
// typedef uint64_t u64;
|
||||
|
||||
// union {
|
||||
// u16 foo;
|
||||
// u8 islittle;
|
||||
// } endian = {.foo = 1};
|
||||
|
||||
union bigint128 {
|
||||
u8 value8[16];
|
||||
u64 value64[2];
|
||||
};
|
||||
|
||||
inline static union bigint128 geniv(u64 *pos) {
|
||||
union bigint128 out;
|
||||
// if (endian.islittle) {
|
||||
//sacrifice code size for possible speed up
|
||||
out.value8[15] = ((u8 *) pos)[0];
|
||||
out.value8[14] = ((u8 *) pos)[1];
|
||||
out.value8[13] = ((u8 *) pos)[2];
|
||||
out.value8[12] = ((u8 *) pos)[3];
|
||||
out.value8[11] = ((u8 *) pos)[4];
|
||||
out.value8[10] = ((u8 *) pos)[5];
|
||||
out.value8[9] = ((u8 *) pos)[6];
|
||||
out.value8[8] = ((u8 *) pos)[7];
|
||||
out.value8[7] = ((u8 *) pos)[8];
|
||||
out.value8[6] = ((u8 *) pos)[9];
|
||||
out.value8[5] = ((u8 *) pos)[10];
|
||||
out.value8[4] = ((u8 *) pos)[11];
|
||||
out.value8[3] = ((u8 *) pos)[12];
|
||||
out.value8[2] = ((u8 *) pos)[13];
|
||||
out.value8[1] = ((u8 *) pos)[14];
|
||||
out.value8[0] = ((u8 *) pos)[15];
|
||||
// } else {
|
||||
// out.value64[1] = pos[0];
|
||||
// out.value64[0] = pos[1];
|
||||
// }
|
||||
return out;
|
||||
}
|
||||
|
||||
inline static void xor128(u64 *foo, u64 *bar) {
|
||||
foo[0] ^= bar[0];
|
||||
foo[1] ^= bar[1];
|
||||
}
|
||||
|
||||
inline static void shift128(u8 *foo) {
|
||||
// if (endian.islittle) {
|
||||
//due to little endian order, we can do this
|
||||
((u64 *) foo)[1] = (((u64 *) foo)[1] << 1) | (((u64 *) foo)[0] >> 63);
|
||||
((u64 *) foo)[0] = (((u64 *) foo)[0] << 1);
|
||||
// } else {
|
||||
// //sacrifice code size for possible speed up
|
||||
// foo[15] = (foo[15] << 1) | (foo[14] >> 7);
|
||||
// foo[14] = (foo[14] << 1) | (foo[13] >> 7);
|
||||
// foo[13] = (foo[13] << 1) | (foo[12] >> 7);
|
||||
// foo[12] = (foo[12] << 1) | (foo[11] >> 7);
|
||||
// foo[11] = (foo[11] << 1) | (foo[10] >> 7);
|
||||
// foo[10] = (foo[10] << 1) | (foo[9] >> 7);
|
||||
// foo[9] = (foo[9] << 1) | (foo[8] >> 7);
|
||||
// foo[8] = (foo[8] << 1) | (foo[7] >> 7);
|
||||
// foo[7] = (foo[7] << 1) | (foo[6] >> 7);
|
||||
// foo[6] = (foo[6] << 1) | (foo[5] >> 7);
|
||||
// foo[5] = (foo[5] << 1) | (foo[4] >> 7);
|
||||
// foo[4] = (foo[4] << 1) | (foo[3] >> 7);
|
||||
// foo[3] = (foo[3] << 1) | (foo[2] >> 7);
|
||||
// foo[2] = (foo[2] << 1) | (foo[1] >> 7);
|
||||
// foo[1] = (foo[1] << 1) | (foo[0] >> 7);
|
||||
// foo[0] = (foo[0] << 1);
|
||||
// }
|
||||
}
|
||||
|
||||
void
|
||||
aes_xtsn_decrypt(u8 *buffer, u64 len, u8 *key, u8 *tweakin, u64 sectoroffsethi, u64 sectoroffsetlo, u32 sector_size);
|
||||
|
||||
void
|
||||
aes_xtsn_encrypt(u8 *buffer, u64 len, u8 *key, u8 *tweakin, u64 sectoroffsethi, u64 sectoroffsetlo, u32 sector_size);
|
||||
|
||||
|
||||
#endif
|
|
@ -42,6 +42,7 @@
|
|||
#include "../utils/util.h"
|
||||
|
||||
#include "key_sources.inl"
|
||||
#include "ccrypto.h"
|
||||
|
||||
#include <string.h>
|
||||
|
||||
|
@ -344,15 +345,28 @@ get_tsec: ;
|
|||
nx_emmc_gpt_parse(&gpt, &storage);
|
||||
|
||||
// Find package2 partition.
|
||||
emmc_part_t *pkg2_part = nx_emmc_part_find(&gpt, "BCPKG2-1-Normal-Main");
|
||||
emmc_part_t *pkg2_part = nx_emmc_part_find(&gpt, "PRODINFO");
|
||||
if (!pkg2_part) {
|
||||
EPRINTF("Failed to locate Package2.");
|
||||
EPRINTF("Failed to locate PRODINFO.");
|
||||
goto pkg2_done;
|
||||
}
|
||||
|
||||
// Read in package2 header and get package2 real size.
|
||||
u8 *tmp = (u8 *)malloc(NX_EMMC_BLOCKSIZE);
|
||||
nx_emmc_part_read(&storage, pkg2_part, 0x4000 / NX_EMMC_BLOCKSIZE, 1, tmp);
|
||||
|
||||
|
||||
|
||||
nx_emmc_part_read(&storage, pkg2_part, 0, 1, tmp);
|
||||
|
||||
gfx_hexdump(0, tmp, NX_EMMC_BLOCKSIZE);
|
||||
|
||||
aes_xtsn_decrypt(tmp, NX_EMMC_BLOCKSIZE, bis_key[0], bis_key[0] + 0x10, pkg2_part->lba_end, pkg2_part->lba_start, NX_EMMC_BLOCKSIZE);
|
||||
|
||||
gfx_hexdump(0, tmp, NX_EMMC_BLOCKSIZE);
|
||||
|
||||
free(tmp);
|
||||
goto pkg2_done;
|
||||
|
||||
u32 *hdr_pkg2_raw = (u32 *)(tmp + 0x100);
|
||||
u32 pkg2_size = hdr_pkg2_raw[0] ^ hdr_pkg2_raw[2] ^ hdr_pkg2_raw[3];
|
||||
free(tmp);
|
||||
|
|
Loading…
Reference in a new issue