diff options
| -rw-r--r-- | README.md | 19 | ||||
| -rw-r--r-- | aes.c | 145 | ||||
| -rw-r--r-- | aes.h | 13 | ||||
| -rw-r--r-- | test.c | 128 | ||||
| -rw-r--r-- | tiny-AES128-C.files | 5 |
5 files changed, 188 insertions, 122 deletions
@@ -1,19 +1,20 @@ -### Tiny AES128 in C +### Tiny AES in C -This is a small and portable implementation of the AES128 ECB and CBC encryption algorithms written in C. +This is a small and portable implementation of the AES ECB and CBC encryption algorithms written in C. The API is very simple and looks like this (I am using C99 `<stdint.h>`-style annotated types): ```C -void AES128_ECB_encrypt(uint8_t* input, const uint8_t* key, uint8_t* output); -void AES128_ECB_decrypt(uint8_t* input, const uint8_t* key, uint8_t* output); -void AES128_CBC_encrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv); -void AES128_CBC_decrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv); +void AES_ECB_encrypt(uint8_t* input, const uint8_t* key, uint8_t* output); +void AES_ECB_decrypt(uint8_t* input, const uint8_t* key, uint8_t* output); +void AES_CBC_encrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv); +void AES_CBC_decrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv); ``` +You can choose to use the standard 128b key or 192/256b by defining the symbols AES192 or AES256 You can choose to use one or both of the modes-of-operation, by defining the symbols CBC and ECB. See the header file for clarification. -There is no built-in error checking or protection from out-of-bounds memory access errors as a result of malicious input. The two functions AES128_ECB_xxcrypt() do most of the work, and they expect inputs of 128 bit length. +There is no built-in error checking or protection from out-of-bounds memory access errors as a result of malicious input. The two functions AES_ECB_xxcrypt() do most of the work, and they expect inputs of 128 bit length. The module uses around 200 bytes of RAM and 2.5K ROM when compiled for ARM (~2K for Thumb but YMMV). @@ -57,9 +58,7 @@ I am using Mentor Graphics free ARM toolchain: This implementation is verified against the data in: -[National Institute of Standards and Technology Special Publication 800-38A 2001 ED](http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf) Appendix F: Example Vectors for Modes of Operation of the AES. +[National Institute of Standards and Technology Special Publication 800-38A 2001 ED](http://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38a.pdf) Appendix F: Example Vectors for Modes of Operation of the AES. All material in this repository is in the public domain. - -I am a bit slow to react to pull requests and issues, but I have an ambition to go through all issues sometime in the future and release an API-stable version. @@ -37,18 +37,29 @@ NOTE: String length must be evenly divisible by 16byte (str_len % 16 == 0) #include <string.h> // CBC mode, for memset #include "aes.h" - /*****************************************************************************/ /* Defines: */ /*****************************************************************************/ // The number of columns comprising a state in AES. This is a constant in AES. Value=4 #define Nb 4 -// The number of 32 bit words in a key. -#define Nk 4 -// Key length in bytes [128 bit] -#define KEYLEN 16 -// The number of rounds in AES Cipher. -#define Nr 10 +#define BLOCKLEN 16 //Block length in bytes AES is 128b block only + +#ifdef AES256 + #define Nk 8 + #define KEYLEN 32 + #define Nr 14 + #define keyExpSize 240 +#elif defined(AES192) + #define Nk 6 + #define KEYLEN 24 + #define Nr 12 + #define keyExpSize 208 +#else + #define Nk 4 // The number of 32 bit words in a key. + #define KEYLEN 16 // Key length in bytes + #define Nr 10 // The number of rounds in AES Cipher. + #define keyExpSize 176 +#endif // jcallan@github points out that declaring Multiply as a function // reduces code size considerably with the Keil ARM compiler. @@ -66,7 +77,7 @@ typedef uint8_t state_t[4][4]; static state_t* state; // The array that stores the round keys. -static uint8_t RoundKey[176]; +static uint8_t RoundKey[keyExpSize]; // The Key input to the AES Program static const uint8_t* Key; @@ -116,27 +127,25 @@ static const uint8_t rsbox[256] = 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 }; - // The round constant word array, Rcon[i], contains the values given by // x to th e power (i-1) being powers of x (x is denoted as {02}) in the field GF(2^8) -// Note that i starts at 1, not 0). -static const uint8_t Rcon[255] = { - 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, - 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, - 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, - 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, - 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, - 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, - 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, - 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, - 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, - 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, - 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, - 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, - 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, - 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, - 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, - 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb }; +static const uint8_t Rcon[256] = { + 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, + 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, + 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, + 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, + 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, + 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, + 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, + 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, + 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, + 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, + 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, + 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, + 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, + 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, + 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, + 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d }; /*****************************************************************************/ @@ -155,7 +164,7 @@ static uint8_t getSBoxInvert(uint8_t num) // This function produces Nb(Nr+1) round keys. The round keys are used in each round to decrypt the states. static void KeyExpansion(void) { - uint32_t i, j, k; + uint32_t i, k; uint8_t tempa[4]; // Used for the column/row operations // The first round key is the key itself. @@ -168,15 +177,19 @@ static void KeyExpansion(void) } // All other round keys are found from the previous round keys. - for(; (i < (Nb * (Nr + 1))); ++i) + //i == Nk + for(; i < Nb * (Nr + 1); ++i) { - for(j = 0; j < 4; ++j) { - tempa[j]=RoundKey[(i-1) * 4 + j]; + tempa[0]=RoundKey[(i-1) * 4 + 0]; + tempa[1]=RoundKey[(i-1) * 4 + 1]; + tempa[2]=RoundKey[(i-1) * 4 + 2]; + tempa[3]=RoundKey[(i-1) * 4 + 3]; } + if (i % Nk == 0) { - // This function rotates the 4 bytes in a word to the left once. + // This function shifts the 4 bytes in a word to the left once. // [a0,a1,a2,a3] becomes [a1,a2,a3,a0] // Function RotWord() @@ -201,7 +214,8 @@ static void KeyExpansion(void) tempa[0] = tempa[0] ^ Rcon[i/Nk]; } - else if (Nk > 6 && i % Nk == 4) +#ifdef AES256 + if (i % Nk == 4) { // Function Subword() { @@ -211,6 +225,7 @@ static void KeyExpansion(void) tempa[3] = getSBoxValue(tempa[3]); } } +#endif RoundKey[i * 4 + 0] = RoundKey[(i - Nk) * 4 + 0] ^ tempa[0]; RoundKey[i * 4 + 1] = RoundKey[(i - Nk) * 4 + 1] ^ tempa[1]; RoundKey[i * 4 + 2] = RoundKey[(i - Nk) * 4 + 2] ^ tempa[2]; @@ -434,16 +449,6 @@ static void InvCipher(void) AddRoundKey(0); } -static void BlockCopy(uint8_t* output, const uint8_t* input) -{ - uint8_t i; - for (i=0;i<KEYLEN;++i) - { - output[i] = input[i]; - } -} - - /*****************************************************************************/ /* Public functions: */ @@ -451,10 +456,10 @@ static void BlockCopy(uint8_t* output, const uint8_t* input) #if defined(ECB) && ECB -void AES128_ECB_encrypt(const uint8_t* input, const uint8_t* key, uint8_t* output) +void AES_ECB_encrypt(const uint8_t* input, const uint8_t* key, uint8_t* output, const uint32_t length) { // Copy input to output, and work in-memory on output - BlockCopy(output, input); + memcpy(output, input, length); state = (state_t*)output; Key = key; @@ -464,10 +469,10 @@ void AES128_ECB_encrypt(const uint8_t* input, const uint8_t* key, uint8_t* outpu Cipher(); } -void AES128_ECB_decrypt(const uint8_t* input, const uint8_t* key, uint8_t *output) +void AES_ECB_decrypt(const uint8_t* input, const uint8_t* key, uint8_t *output, const uint32_t length) { // Copy input to output, and work in-memory on output - BlockCopy(output, input); + memcpy(output, input, length); state = (state_t*)output; // The KeyExpansion routine must be called before encryption. @@ -490,19 +495,16 @@ void AES128_ECB_decrypt(const uint8_t* input, const uint8_t* key, uint8_t *outpu static void XorWithIv(uint8_t* buf) { uint8_t i; - for(i = 0; i < KEYLEN; ++i) + for(i = 0; i < BLOCKLEN; ++i) //WAS for(i = 0; i < KEYLEN; ++i) but the block in AES is always 128bit so 16 bytes! { buf[i] ^= Iv[i]; } } -void AES128_CBC_encrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv) +void AES_CBC_encrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv) { uintptr_t i; - uint8_t remainders = length % KEYLEN; /* Remaining bytes in the last non-full block */ - - BlockCopy(output, input); - state = (state_t*)output; + uint8_t extra = length % BLOCKLEN; /* Remaining bytes in the last non-full block */ // Skip the key expansion if key is passed as 0 if(0 != key) @@ -516,33 +518,30 @@ void AES128_CBC_encrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, Iv = (uint8_t*)iv; } - for(i = 0; i < length; i += KEYLEN) + for(i = 0; i < length; i += BLOCKLEN) { XorWithIv(input); - BlockCopy(output, input); + memcpy(output, input, BLOCKLEN); state = (state_t*)output; Cipher(); Iv = output; - input += KEYLEN; - output += KEYLEN; + input += BLOCKLEN; + output += BLOCKLEN; + //printf("Step %d - %d", i/16, i); } - if(remainders) + if(extra) { - BlockCopy(output, input); - memset(output + remainders, 0, KEYLEN - remainders); /* add 0-padding */ + memcpy(output, input, extra); state = (state_t*)output; Cipher(); } } -void AES128_CBC_decrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv) +void AES_CBC_decrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv) { uintptr_t i; - uint8_t remainders = length % KEYLEN; /* Remaining bytes in the last non-full block */ - - BlockCopy(output, input); - state = (state_t*)output; + uint8_t extra = length % BLOCKLEN; /* Remaining bytes in the last non-full block */ // Skip the key expansion if key is passed as 0 if(0 != key) @@ -557,27 +556,23 @@ void AES128_CBC_decrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, Iv = (uint8_t*)iv; } - for(i = 0; i < length; i += KEYLEN) + for(i = 0; i < length; i += BLOCKLEN) { - BlockCopy(output, input); + memcpy(output, input, BLOCKLEN); state = (state_t*)output; InvCipher(); XorWithIv(output); Iv = input; - input += KEYLEN; - output += KEYLEN; + input += BLOCKLEN; + output += BLOCKLEN; } - if(remainders) + if(extra) { - BlockCopy(output, input); - memset(output+remainders, 0, KEYLEN - remainders); /* add 0-padding */ + memcpy(output, input, extra); state = (state_t*)output; InvCipher(); } } - #endif // #if defined(CBC) && CBC - - @@ -6,7 +6,7 @@ // #define the macros below to 1/0 to enable/disable the mode of operation. // -// CBC enables AES128 encryption in CBC-mode of operation and handles 0-padding. +// CBC enables AES encryption in CBC-mode of operation. // ECB enables the basic ECB 16-byte block algorithm. Both can be enabled simultaneously. // The #ifndef-guard allows it to be configured before #include'ing or at compile time. @@ -18,23 +18,22 @@ #define ECB 1 #endif - +#define AES128 #if defined(ECB) && ECB -void AES128_ECB_encrypt(const uint8_t* input, const uint8_t* key, uint8_t *output); -void AES128_ECB_decrypt(const uint8_t* input, const uint8_t* key, uint8_t *output); +void AES_ECB_encrypt(const uint8_t* input, const uint8_t* key, uint8_t *output, const uint32_t length); +void AES_ECB_decrypt(const uint8_t* input, const uint8_t* key, uint8_t *output, const uint32_t length); #endif // #if defined(ECB) && ECB #if defined(CBC) && CBC -void AES128_CBC_encrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv); -void AES128_CBC_decrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv); +void AES_CBC_encrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv); +void AES_CBC_decrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv); #endif // #if defined(CBC) && CBC - #endif //_AES_H_ @@ -9,6 +9,7 @@ #include "aes.h" + static void phex(uint8_t* str); static void test_encrypt_ecb(void); static void test_decrypt_ecb(void); @@ -17,25 +18,44 @@ static void test_encrypt_cbc(void); static void test_decrypt_cbc(void); - int main(void) { + +#ifdef AES128 + printf("\nTesting AES128\n\n"); +#elif defined(AES192) + printf("\nTesting AES192\n\n"); +#elif defined(AES256) + printf("\nTesting AES256\n\n"); +#else + printf("You need to specify a symbol between AES128, AES192 or AES256. Exiting"); + return 0; +#endif + test_encrypt_cbc(); test_decrypt_cbc(); test_decrypt_ecb(); test_encrypt_ecb(); test_encrypt_ecb_verbose(); - + return 0; } - // prints string as hex static void phex(uint8_t* str) { + +#ifdef AES128 + uint8_t len = 16; +#elif defined(AES192) + uint8_t len = 24; +#elif defined(AES256) + uint8_t len = 32; +#endif + unsigned char i; - for(i = 0; i < 16; ++i) + for(i = 0; i < len; ++i) printf("%.2x", str[i]); printf("\n"); } @@ -74,7 +94,7 @@ static void test_encrypt_ecb_verbose(void) printf("ciphertext:\n"); for(i = 0; i < 4; ++i) { - AES128_ECB_encrypt(plain_text + (i*16), key, buf+(i*16)); + AES_ECB_encrypt(plain_text + (i*16), key, buf+(i*16), 16); phex(buf + (i*16)); } printf("\n"); @@ -83,12 +103,23 @@ static void test_encrypt_ecb_verbose(void) static void test_encrypt_ecb(void) { - uint8_t key[] = {0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c}; +#ifdef AES128 + uint8_t key[] = {0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c}; + uint8_t out[] = {0x3a, 0xd7, 0x7b, 0xb4, 0x0d, 0x7a, 0x36, 0x60, 0xa8, 0x9e, 0xca, 0xf3, 0x24, 0x66, 0xef, 0x97}; +#elif defined(AES192) + uint8_t key[] = { 0x8e, 0x73, 0xb0, 0xf7, 0xda, 0x0e, 0x64, 0x52, 0xc8, 0x10, 0xf3, 0x2b, 0x80, 0x90, 0x79, 0xe5, + 0x62, 0xf8, 0xea, 0xd2, 0x52, 0x2c, 0x6b, 0x7b}; + uint8_t out[] = { 0xbd, 0x33, 0x4f, 0x1d, 0x6e, 0x45, 0xf2, 0x5f, 0xf7, 0x12, 0xa2, 0x14, 0x57, 0x1f, 0xa5, 0xcc }; +#elif defined(AES256) + uint8_t key[] = { 0x60, 0x3d, 0xeb, 0x10, 0x15, 0xca, 0x71, 0xbe, 0x2b, 0x73, 0xae, 0xf0, 0x85, 0x7d, 0x77, 0x81, + 0x1f, 0x35, 0x2c, 0x07, 0x3b, 0x61, 0x08, 0xd7, 0x2d, 0x98, 0x10, 0xa3, 0x09, 0x14, 0xdf, 0xf4 }; + uint8_t out[] = { 0xf3, 0xee, 0xd1, 0xbd, 0xb5, 0xd2, 0xa0, 0x3c, 0x06, 0x4b, 0x5a, 0x7e, 0x3d, 0xb1, 0x81, 0xf8 }; +#endif + uint8_t in[] = {0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96, 0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a}; - uint8_t out[] = {0x3a, 0xd7, 0x7b, 0xb4, 0x0d, 0x7a, 0x36, 0x60, 0xa8, 0x9e, 0xca, 0xf3, 0x24, 0x66, 0xef, 0x97}; uint8_t buffer[16]; - AES128_ECB_encrypt(in, key, buffer); + AES_ECB_encrypt(in, key, buffer, 16); printf("ECB encrypt: "); @@ -104,24 +135,35 @@ static void test_encrypt_ecb(void) static void test_decrypt_cbc(void) { - // Example "simulating" a smaller buffer... +#ifdef AES128 uint8_t key[] = { 0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c }; - uint8_t iv[] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f }; - uint8_t in[] = { 0x76, 0x49, 0xab, 0xac, 0x81, 0x19, 0xb2, 0x46, 0xce, 0xe9, 0x8e, 0x9b, 0x12, 0xe9, 0x19, 0x7d, + uint8_t in[] = { 0x76, 0x49, 0xab, 0xac, 0x81, 0x19, 0xb2, 0x46, 0xce, 0xe9, 0x8e, 0x9b, 0x12, 0xe9, 0x19, 0x7d, 0x50, 0x86, 0xcb, 0x9b, 0x50, 0x72, 0x19, 0xee, 0x95, 0xdb, 0x11, 0x3a, 0x91, 0x76, 0x78, 0xb2, - 0x73, 0xbe, 0xd6, 0xb8, 0xe3, 0xc1, 0x74, 0x3b, 0x71, 0x16, 0xe6, 0x9e, 0x22, 0x22, 0x95, 0x16, + 0x73, 0xbe, 0xd6, 0xb8, 0xe3, 0xc1, 0x74, 0x3b, 0x71, 0x16, 0xe6, 0x9e, 0x22, 0x22, 0x95, 0x16, 0x3f, 0xf1, 0xca, 0xa1, 0x68, 0x1f, 0xac, 0x09, 0x12, 0x0e, 0xca, 0x30, 0x75, 0x86, 0xe1, 0xa7 }; - uint8_t out[] = { 0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96, 0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a, - 0xae, 0x2d, 0x8a, 0x57, 0x1e, 0x03, 0xac, 0x9c, 0x9e, 0xb7, 0x6f, 0xac, 0x45, 0xaf, 0x8e, 0x51, - 0x30, 0xc8, 0x1c, 0x46, 0xa3, 0x5c, 0xe4, 0x11, 0xe5, 0xfb, 0xc1, 0x19, 0x1a, 0x0a, 0x52, 0xef, - 0xf6, 0x9f, 0x24, 0x45, 0xdf, 0x4f, 0x9b, 0x17, 0xad, 0x2b, 0x41, 0x7b, 0xe6, 0x6c, 0x37, 0x10 }; +#elif defined(AES192) + uint8_t key[] = { 0x8e, 0x73, 0xb0, 0xf7, 0xda, 0x0e, 0x64, 0x52, 0xc8, 0x10, 0xf3, 0x2b, 0x80, 0x90, 0x79, 0xe5, 0x62, 0xf8, 0xea, 0xd2, 0x52, 0x2c, 0x6b, 0x7b}; + uint8_t in[] = { 0x4f, 0x02, 0x1d, 0xb2, 0x43, 0xbc, 0x63, 0x3d, 0x71, 0x78, 0x18, 0x3a, 0x9f, 0xa0, 0x71, 0xe8, + 0xb4, 0xd9, 0xad, 0xa9, 0xad, 0x7d, 0xed, 0xf4, 0xe5, 0xe7, 0x38, 0x76, 0x3f, 0x69, 0x14, 0x5a, + 0x57, 0x1b, 0x24, 0x20, 0x12, 0xfb, 0x7a, 0xe0, 0x7f, 0xa9, 0xba, 0xac, 0x3d, 0xf1, 0x02, 0xe0, + 0x08, 0xb0, 0xe2, 0x79, 0x88, 0x59, 0x88, 0x81, 0xd9, 0x20, 0xa9, 0xe6, 0x4f, 0x56, 0x15, 0xcd }; +#elif defined(AES256) + uint8_t key[] = { 0x60, 0x3d, 0xeb, 0x10, 0x15, 0xca, 0x71, 0xbe, 0x2b, 0x73, 0xae, 0xf0, 0x85, 0x7d, 0x77, 0x81, + 0x1f, 0x35, 0x2c, 0x07, 0x3b, 0x61, 0x08, 0xd7, 0x2d, 0x98, 0x10, 0xa3, 0x09, 0x14, 0xdf, 0xf4 }; + uint8_t in[] = { 0xf5, 0x8c, 0x4c, 0x04, 0xd6, 0xe5, 0xf1, 0xba, 0x77, 0x9e, 0xab, 0xfb, 0x5f, 0x7b, 0xfb, 0xd6, + 0x9c, 0xfc, 0x4e, 0x96, 0x7e, 0xdb, 0x80, 0x8d, 0x67, 0x9f, 0x77, 0x7b, 0xc6, 0x70, 0x2c, 0x7d, + 0x39, 0xf2, 0x33, 0x69, 0xa9, 0xd9, 0xba, 0xcf, 0xa5, 0x30, 0xe2, 0x63, 0x04, 0x23, 0x14, 0x61, + 0xb2, 0xeb, 0x05, 0xe2, 0xc3, 0x9b, 0xe9, 0xfc, 0xda, 0x6c, 0x19, 0x07, 0x8c, 0x6a, 0x9d, 0x1b }; +#endif + uint8_t iv[] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f }; + uint8_t out[] = { 0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96, 0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a, + 0xae, 0x2d, 0x8a, 0x57, 0x1e, 0x03, 0xac, 0x9c, 0x9e, 0xb7, 0x6f, 0xac, 0x45, 0xaf, 0x8e, 0x51, + 0x30, 0xc8, 0x1c, 0x46, 0xa3, 0x5c, 0xe4, 0x11, 0xe5, 0xfb, 0xc1, 0x19, 0x1a, 0x0a, 0x52, 0xef, + 0xf6, 0x9f, 0x24, 0x45, 0xdf, 0x4f, 0x9b, 0x17, 0xad, 0x2b, 0x41, 0x7b, 0xe6, 0x6c, 0x37, 0x10 }; uint8_t buffer[64]; - AES128_CBC_decrypt_buffer(buffer+0, in+0, 16, key, iv); - AES128_CBC_decrypt_buffer(buffer+16, in+16, 16, 0, 0); - AES128_CBC_decrypt_buffer(buffer+32, in+32, 16, 0, 0); - AES128_CBC_decrypt_buffer(buffer+48, in+48, 16, 0, 0); + AES_CBC_decrypt_buffer(buffer, in, 64, key, iv); printf("CBC decrypt: "); @@ -137,19 +179,35 @@ static void test_decrypt_cbc(void) static void test_encrypt_cbc(void) { +#ifdef AES128 uint8_t key[] = { 0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c }; + uint8_t out[] = { 0x76, 0x49, 0xab, 0xac, 0x81, 0x19, 0xb2, 0x46, 0xce, 0xe9, 0x8e, 0x9b, 0x12, 0xe9, 0x19, 0x7d, + 0x50, 0x86, 0xcb, 0x9b, 0x50, 0x72, 0x19, 0xee, 0x95, 0xdb, 0x11, 0x3a, 0x91, 0x76, 0x78, 0xb2, + 0x73, 0xbe, 0xd6, 0xb8, 0xe3, 0xc1, 0x74, 0x3b, 0x71, 0x16, 0xe6, 0x9e, 0x22, 0x22, 0x95, 0x16, + 0x3f, 0xf1, 0xca, 0xa1, 0x68, 0x1f, 0xac, 0x09, 0x12, 0x0e, 0xca, 0x30, 0x75, 0x86, 0xe1, 0xa7 }; +#elif defined(AES192) + uint8_t key[] = { 0x8e, 0x73, 0xb0, 0xf7, 0xda, 0x0e, 0x64, 0x52, 0xc8, 0x10, 0xf3, 0x2b, 0x80, 0x90, 0x79, 0xe5, 0x62, 0xf8, 0xea, 0xd2, 0x52, 0x2c, 0x6b, 0x7b}; + uint8_t out[] = { 0x4f, 0x02, 0x1d, 0xb2, 0x43, 0xbc, 0x63, 0x3d, 0x71, 0x78, 0x18, 0x3a, 0x9f, 0xa0, 0x71, 0xe8, + 0xb4, 0xd9, 0xad, 0xa9, 0xad, 0x7d, 0xed, 0xf4, 0xe5, 0xe7, 0x38, 0x76, 0x3f, 0x69, 0x14, 0x5a, + 0x57, 0x1b, 0x24, 0x20, 0x12, 0xfb, 0x7a, 0xe0, 0x7f, 0xa9, 0xba, 0xac, 0x3d, 0xf1, 0x02, 0xe0, + 0x08, 0xb0, 0xe2, 0x79, 0x88, 0x59, 0x88, 0x81, 0xd9, 0x20, 0xa9, 0xe6, 0x4f, 0x56, 0x15, 0xcd }; +#elif defined(AES256) + uint8_t key[] = { 0x60, 0x3d, 0xeb, 0x10, 0x15, 0xca, 0x71, 0xbe, 0x2b, 0x73, 0xae, 0xf0, 0x85, 0x7d, 0x77, 0x81, + 0x1f, 0x35, 0x2c, 0x07, 0x3b, 0x61, 0x08, 0xd7, 0x2d, 0x98, 0x10, 0xa3, 0x09, 0x14, 0xdf, 0xf4 }; + uint8_t out[] = { 0xf5, 0x8c, 0x4c, 0x04, 0xd6, 0xe5, 0xf1, 0xba, 0x77, 0x9e, 0xab, 0xfb, 0x5f, 0x7b, 0xfb, 0xd6, + 0x9c, 0xfc, 0x4e, 0x96, 0x7e, 0xdb, 0x80, 0x8d, 0x67, 0x9f, 0x77, 0x7b, 0xc6, 0x70, 0x2c, 0x7d, + 0x39, 0xf2, 0x33, 0x69, 0xa9, 0xd9, 0xba, 0xcf, 0xa5, 0x30, 0xe2, 0x63, 0x04, 0x23, 0x14, 0x61, + 0xb2, 0xeb, 0x05, 0xe2, 0xc3, 0x9b, 0xe9, 0xfc, 0xda, 0x6c, 0x19, 0x07, 0x8c, 0x6a, 0x9d, 0x1b }; +#endif uint8_t iv[] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f }; uint8_t in[] = { 0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96, 0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a, 0xae, 0x2d, 0x8a, 0x57, 0x1e, 0x03, 0xac, 0x9c, 0x9e, 0xb7, 0x6f, 0xac, 0x45, 0xaf, 0x8e, 0x51, 0x30, 0xc8, 0x1c, 0x46, 0xa3, 0x5c, 0xe4, 0x11, 0xe5, 0xfb, 0xc1, 0x19, 0x1a, 0x0a, 0x52, 0xef, 0xf6, 0x9f, 0x24, 0x45, 0xdf, 0x4f, 0x9b, 0x17, 0xad, 0x2b, 0x41, 0x7b, 0xe6, 0x6c, 0x37, 0x10 }; - uint8_t out[] = { 0x76, 0x49, 0xab, 0xac, 0x81, 0x19, 0xb2, 0x46, 0xce, 0xe9, 0x8e, 0x9b, 0x12, 0xe9, 0x19, 0x7d, - 0x50, 0x86, 0xcb, 0x9b, 0x50, 0x72, 0x19, 0xee, 0x95, 0xdb, 0x11, 0x3a, 0x91, 0x76, 0x78, 0xb2, - 0x73, 0xbe, 0xd6, 0xb8, 0xe3, 0xc1, 0x74, 0x3b, 0x71, 0x16, 0xe6, 0x9e, 0x22, 0x22, 0x95, 0x16, - 0x3f, 0xf1, 0xca, 0xa1, 0x68, 0x1f, 0xac, 0x09, 0x12, 0x0e, 0xca, 0x30, 0x75, 0x86, 0xe1, 0xa7 }; + uint8_t buffer[64]; - AES128_CBC_encrypt_buffer(buffer, in, 64, key, iv); + AES_CBC_encrypt_buffer(buffer, in, 64, key, iv); printf("CBC encrypt: "); @@ -166,12 +224,23 @@ static void test_encrypt_cbc(void) static void test_decrypt_ecb(void) { - uint8_t key[] = {0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c}; - uint8_t in[] = {0x3a, 0xd7, 0x7b, 0xb4, 0x0d, 0x7a, 0x36, 0x60, 0xa8, 0x9e, 0xca, 0xf3, 0x24, 0x66, 0xef, 0x97}; - uint8_t out[] = {0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96, 0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a}; +#ifdef AES128 + uint8_t key[] = {0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c}; + uint8_t in[] = {0x3a, 0xd7, 0x7b, 0xb4, 0x0d, 0x7a, 0x36, 0x60, 0xa8, 0x9e, 0xca, 0xf3, 0x24, 0x66, 0xef, 0x97}; +#elif defined(AES192) + uint8_t key[] = { 0x8e, 0x73, 0xb0, 0xf7, 0xda, 0x0e, 0x64, 0x52, 0xc8, 0x10, 0xf3, 0x2b, 0x80, 0x90, 0x79, 0xe5, + 0x62, 0xf8, 0xea, 0xd2, 0x52, 0x2c, 0x6b, 0x7b}; + uint8_t in[] = { 0xbd, 0x33, 0x4f, 0x1d, 0x6e, 0x45, 0xf2, 0x5f, 0xf7, 0x12, 0xa2, 0x14, 0x57, 0x1f, 0xa5, 0xcc }; +#elif defined(AES256) + uint8_t key[] = { 0x60, 0x3d, 0xeb, 0x10, 0x15, 0xca, 0x71, 0xbe, 0x2b, 0x73, 0xae, 0xf0, 0x85, 0x7d, 0x77, 0x81, + 0x1f, 0x35, 0x2c, 0x07, 0x3b, 0x61, 0x08, 0xd7, 0x2d, 0x98, 0x10, 0xa3, 0x09, 0x14, 0xdf, 0xf4 }; + uint8_t in[] = { 0xf3, 0xee, 0xd1, 0xbd, 0xb5, 0xd2, 0xa0, 0x3c, 0x06, 0x4b, 0x5a, 0x7e, 0x3d, 0xb1, 0x81, 0xf8 }; +#endif + + uint8_t out[] = {0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96, 0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a}; uint8_t buffer[16]; - AES128_ECB_decrypt(in, key, buffer); + AES_ECB_decrypt(in, key, buffer, 16); printf("ECB decrypt: "); @@ -185,4 +254,3 @@ static void test_decrypt_ecb(void) } } - diff --git a/tiny-AES128-C.files b/tiny-AES128-C.files new file mode 100644 index 0000000..ae78f94 --- /dev/null +++ b/tiny-AES128-C.files @@ -0,0 +1,5 @@ +README.md +aes.c +aes.h +test.c +unlicense.txt |