kopia lustrzana https://github.com/jgromes/RadioLib
175 wiersze
7.1 KiB
C++
175 wiersze
7.1 KiB
C++
#if !defined(_RADIOLIB_CRYPTOGRAPHY_H)
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#define _RADIOLIB_CRYPTOGRAPHY_H
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#include "../TypeDef.h"
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#include "../Module.h"
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// AES-128 constants
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#define RADIOLIB_AES128_BLOCK_SIZE (16)
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#define RADIOLIB_AES128_KEY_SIZE (RADIOLIB_AES128_BLOCK_SIZE)
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#define RADIOLIB_AES128_N_K ((RADIOLIB_AES128_BLOCK_SIZE) / sizeof(uint32_t))
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#define RADIOLIB_AES128_N_B (4)
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#define RADIOLIB_AES128_N_R (10)
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#define RADIOLIB_AES128_KEY_EXP_SIZE (176)
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// helper type
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typedef uint8_t state_t[4][4];
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// AES lookup tables
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static const uint8_t aesSbox[] RADIOLIB_NONVOLATILE = {
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0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5,
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0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
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0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0,
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0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
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0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc,
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0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
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0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a,
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0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
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0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0,
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0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
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0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b,
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0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
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0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85,
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0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
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0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5,
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0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
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0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17,
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0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
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0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88,
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0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
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0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c,
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0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
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0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9,
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0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
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0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6,
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0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
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0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e,
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0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
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0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94,
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0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
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0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68,
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0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16
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};
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static const uint8_t aesSboxInv[] RADIOLIB_NONVOLATILE = {
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0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38,
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0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,
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0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87,
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0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,
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0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d,
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0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,
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0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2,
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0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25,
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0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16,
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0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92,
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0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda,
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0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,
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0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a,
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0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06,
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0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02,
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0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b,
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0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea,
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0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,
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0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85,
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0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e,
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0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89,
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0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,
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0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20,
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0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,
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0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31,
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0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,
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0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d,
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0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,
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0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0,
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0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
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0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26,
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0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d
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};
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static const uint8_t aesRcon[] = { 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36 };
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/*!
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\class RadioLibAES128
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Most of the implementation here is adapted from https://github.com/kokke/tiny-AES-c
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Additional code and CMAC calculation is from https://github.com/megrxu/AES-CMAC
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\brief Class to perform AES encryption, decryption and CMAC.
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*/
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class RadioLibAES128 {
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public:
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/*!
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\brief Default constructor.
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*/
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RadioLibAES128();
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/*!
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\brief Initialize the AES.
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\param key AES key to use.
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*/
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void init(uint8_t* key);
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/*!
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\brief Perform ECB-type AES encryption.
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\param in Input plaintext data (unpadded).
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\param len Length of the input data.
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\param out Buffer to save the output ciphertext into. It is up to the caller
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to ensure the buffer is sufficiently large to save the data!
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\returns The number of bytes saved into the output buffer.
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*/
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size_t encryptECB(uint8_t* in, size_t len, uint8_t* out);
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/*!
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\brief Perform ECB-type AES decryption.
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\param in Input ciphertext data.
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\param len Length of the input data.
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\param out Buffer to save the output plaintext into. It is up to the caller
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to ensure the buffer is sufficiently large to save the data!
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\returns The number of bytes saved into the output buffer.
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*/
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size_t decryptECB(uint8_t* in, size_t len, uint8_t* out);
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/*!
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\brief Calculate message authentication code according to RFC4493.
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\param in Input data (unpadded).
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\param len Length of the input data.
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\param cmac Buffer to save the output MAC into. The buffer must be at least 16 bytes long!
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*/
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void generateCMAC(uint8_t* in, size_t len, uint8_t* cmac);
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/*!
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\brief Verify the received CMAC. This just calculates the CMAC again and compares the results.
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\param in Input data (unpadded).
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\param len Length of the input data.
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\param cmac CMAC to verify.
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\returns True if valid, false otherwise.
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*/
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bool verifyCMAC(uint8_t* in, size_t len, const uint8_t* cmac);
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private:
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uint8_t* keyPtr = nullptr;
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uint8_t roundKey[RADIOLIB_AES128_KEY_EXP_SIZE] = { 0 };
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void keyExpansion(uint8_t* roundKey, const uint8_t* key);
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void cipher(state_t* state, uint8_t* roundKey);
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void decipher(state_t* state, uint8_t* roundKey);
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void subWord(uint8_t* word);
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void rotWord(uint8_t* word);
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void blockXor(uint8_t* dst, const uint8_t* a, const uint8_t* b);
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void blockLeftshift(uint8_t* dst, const uint8_t* src);
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void generateSubkeys(uint8_t* key1, uint8_t* key2);
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void subBytes(state_t* state, const uint8_t* box);
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void shiftRows(state_t* state, bool inv);
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void mixColumns(state_t* state, bool inv);
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// cppcheck seems convinced these are nut used, which is not true
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uint8_t mul(uint8_t a, uint8_t b); // cppcheck-suppress unusedPrivateFunction
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void addRoundKey(uint8_t round, state_t* state, const uint8_t* roundKey); // cppcheck-suppress unusedPrivateFunction
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};
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// the global singleton
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extern RadioLibAES128 RadioLibAES128Instance;
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#endif
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