Edward Stott / Crypto_light

This library implements some hash and cryptographic algorithms.

Dependents:   ES_CW2_Starter_JIN EMBEDDED_CW2 EMBEDDED_CW2_Final Spinnybois ... more

Fork of Crypto by Francois Berder

cipher/BlockCipher.cpp@15:634f9c4cbab1, 2018-03-09 (annotated)

Committer:
estott
Date:
Fri Mar 09 10:10:16 2018 +0000
Revision:
15:634f9c4cbab1
Parent:
14:f04410cef037 
Reduced flash footprint by removing __forceinline directive in SHA2_32.c

Who changed what in which revision?

UserRevisionLine numberNew contents of line
feb11 8:a090264e9b2d 1 #include "BlockCipher.h"
feb11 8:a090264e9b2d 2 #include <string.h>
feb11 8:a090264e9b2d 3
feb11 8:a090264e9b2d 4 BlockCipher::BlockCipher(uint32_t bs, BLOCK_CIPHER_MODE m, uint8_t *iv):
feb11 8:a090264e9b2d 5 Cipher(),
feb11 8:a090264e9b2d 6 blockSize(bs),
feb11 8:a090264e9b2d 7 mode(m),
feb11 8:a090264e9b2d 8 IV(0)
feb11 8:a090264e9b2d 9 {
feb11 8:a090264e9b2d 10 if(mode == CBC_MODE)
feb11 8:a090264e9b2d 11 {
feb11 8:a090264e9b2d 12 IV = new uint8_t[blockSize];
feb11 8:a090264e9b2d 13 memcpy(IV, iv, blockSize);
feb11 8:a090264e9b2d 14 }
feb11 8:a090264e9b2d 15 }
feb11 8:a090264e9b2d 16
feb11 8:a090264e9b2d 17 BlockCipher::~BlockCipher()
feb11 8:a090264e9b2d 18 {
feb11 8:a090264e9b2d 19 if(IV != 0)
feb11 8:a090264e9b2d 20 delete[] IV;
feb11 8:a090264e9b2d 21 }
feb11 8:a090264e9b2d 22
feb11 8:a090264e9b2d 23 CIPHER_TYPE BlockCipher::getType() const
feb11 8:a090264e9b2d 24 {
feb11 8:a090264e9b2d 25 return BLOCK_CIPHER;
feb11 8:a090264e9b2d 26 }
feb11 8:a090264e9b2d 27
feb11 8:a090264e9b2d 28 uint32_t BlockCipher::getBlockSize() const
feb11 8:a090264e9b2d 29 {
feb11 8:a090264e9b2d 30 return blockSize;
feb11 8:a090264e9b2d 31 }
feb11 8:a090264e9b2d 32
feb11 8:a090264e9b2d 33 void BlockCipher::encrypt(uint8_t *out, uint8_t *in, uint32_t length)
feb11 8:a090264e9b2d 34 {
feb11 14:f04410cef037 35 uint8_t *tmp = 0;
feb11 14:f04410cef037 36 if(mode == CBC_MODE)
feb11 14:f04410cef037 37 tmp = new uint8_t[getBlockSize()];
feb11 8:a090264e9b2d 38 for(uint32_t i = 0; i < length; i += getBlockSize())
feb11 8:a090264e9b2d 39 {
feb11 14:f04410cef037 40 if(mode == CBC_MODE)
feb11 14:f04410cef037 41 {
feb11 14:f04410cef037 42 memcpy(tmp, &in[i], getBlockSize());
feb11 14:f04410cef037 43 for(int j = 0; j < (int)getBlockSize(); ++j)
feb11 14:f04410cef037 44 tmp[j] ^= IV[j];
feb11 14:f04410cef037 45
feb11 14:f04410cef037 46 encryptBlock(&out[i], tmp);
feb11 8:a090264e9b2d 47
feb11 14:f04410cef037 48 memcpy(IV, &out[i], getBlockSize());
feb11 14:f04410cef037 49 }
feb11 14:f04410cef037 50 else
feb11 14:f04410cef037 51 encryptBlock(&out[i], &in[i]);
feb11 8:a090264e9b2d 52 }
feb11 14:f04410cef037 53 if(mode == CBC_MODE)
feb11 14:f04410cef037 54 delete[] tmp;
feb11 8:a090264e9b2d 55 }
feb11 8:a090264e9b2d 56
feb11 8:a090264e9b2d 57 void BlockCipher::decrypt(uint8_t *out, uint8_t *in, uint32_t length)
feb11 8:a090264e9b2d 58 {
feb11 8:a090264e9b2d 59 for(uint32_t i = 0; i < length; i += getBlockSize())
feb11 8:a090264e9b2d 60 {
feb11 14:f04410cef037 61 if(mode == CBC_MODE)
feb11 14:f04410cef037 62 {
feb11 14:f04410cef037 63 decryptBlock(&out[i], &in[i]);
feb11 14:f04410cef037 64 for(int j = 0; j < (int)getBlockSize(); ++j)
feb11 14:f04410cef037 65 out[i+j] ^= IV[j];
feb11 8:a090264e9b2d 66
feb11 14:f04410cef037 67 memcpy(IV, &in[i], getBlockSize());
feb11 14:f04410cef037 68 }
feb11 14:f04410cef037 69 else
feb11 14:f04410cef037 70 decryptBlock(&out[i], &in[i]);
feb11 8:a090264e9b2d 71 }
feb11 8:a090264e9b2d 72 }