mirror of https://github.com/kokke/tiny-AES-c
adding aes256 aes192 options
This commit is contained in:
Matteo Brichese
parent
8592c76b48
commit
2089462272
36
aes.c
36
aes.c
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@ -448,16 +448,6 @@ static void InvCipher(void)
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AddRoundKey(0);
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}
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static void BlockCopy(uint8_t* output, const uint8_t* input)
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{
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uint8_t i;
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for (i=0;i<KEYLEN;++i)
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{
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output[i] = input[i];
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}
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}
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/*****************************************************************************/
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/* Public functions: */
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@ -465,10 +455,10 @@ static void BlockCopy(uint8_t* output, const uint8_t* input)
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#if defined(ECB) && ECB
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void AES_ECB_encrypt(const uint8_t* input, const uint8_t* key, uint8_t* output)
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void AES_ECB_encrypt(const uint8_t* input, const uint8_t* key, uint8_t* output, const uint32_t length)
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{
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// Copy input to output, and work in-memory on output
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BlockCopy(output, input);
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memcpy(output, input, length);
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state = (state_t*)output;
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Key = key;
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@ -478,10 +468,10 @@ void AES_ECB_encrypt(const uint8_t* input, const uint8_t* key, uint8_t* output)
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Cipher();
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}
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void AES_ECB_decrypt(const uint8_t* input, const uint8_t* key, uint8_t *output)
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void AES_ECB_decrypt(const uint8_t* input, const uint8_t* key, uint8_t *output, const uint32_t length)
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{
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// Copy input to output, and work in-memory on output
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BlockCopy(output, input);
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memcpy(output, input, length);
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state = (state_t*)output;
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// The KeyExpansion routine must be called before encryption.
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@ -504,7 +494,7 @@ void AES_ECB_decrypt(const uint8_t* input, const uint8_t* key, uint8_t *output)
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static void XorWithIv(uint8_t* buf)
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{
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uint8_t i;
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for(i = 0; i < KEYLEN; ++i)
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for(i = 0; i < 16; ++i) //WAS for(i = 0; i < KEYLEN; ++i) but the block in AES is always 128bit so 16 bytes!
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{
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buf[i] ^= Iv[i];
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}
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@ -515,7 +505,7 @@ void AES_CBC_encrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, co
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uintptr_t i;
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uint8_t remainders = length % KEYLEN; /* Remaining bytes in the last non-full block */
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BlockCopy(output, input);
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memcpy(output, input, KEYLEN);
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state = (state_t*)output;
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// Skip the key expansion if key is passed as 0
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@ -530,10 +520,10 @@ void AES_CBC_encrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, co
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Iv = (uint8_t*)iv;
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}
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for(i = 0; i < length; i += KEYLEN)
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for(i = 0; i < length-remainders; i += KEYLEN)
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{
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XorWithIv(input);
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BlockCopy(output, input);
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memcpy(output, input, KEYLEN);
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state = (state_t*)output;
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Cipher();
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Iv = output;
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@ -543,8 +533,8 @@ void AES_CBC_encrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, co
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if(remainders)
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{
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BlockCopy(output, input);
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memset(output + remainders, 0, KEYLEN - remainders); /* add 0-padding */
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memcpy(output, input, remainders);
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//memset(output + remainders, 0, KEYLEN - remainders); /* add 0-padding */
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state = (state_t*)output;
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Cipher();
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}
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@ -555,7 +545,7 @@ void AES_CBC_decrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, co
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uintptr_t i;
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uint8_t remainders = length % KEYLEN; /* Remaining bytes in the last non-full block */
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BlockCopy(output, input);
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memcpy(output, input, KEYLEN);
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state = (state_t*)output;
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// Skip the key expansion if key is passed as 0
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@ -573,7 +563,7 @@ void AES_CBC_decrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, co
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for(i = 0; i < length; i += KEYLEN)
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{
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BlockCopy(output, input);
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memcpy(output, input, KEYLEN);
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state = (state_t*)output;
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InvCipher();
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XorWithIv(output);
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@ -584,7 +574,7 @@ void AES_CBC_decrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, co
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if(remainders)
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{
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BlockCopy(output, input);
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memcpy(output, input, KEYLEN);
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memset(output+remainders, 0, KEYLEN - remainders); /* add 0-padding */
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state = (state_t*)output;
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InvCipher();
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7
aes.h
7
aes.h
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@ -18,13 +18,12 @@
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#define ECB 1
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#endif
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#define AES128
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#define AES256
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#if defined(ECB) && ECB
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void AES_ECB_encrypt(const uint8_t* input, const uint8_t* key, uint8_t *output);
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void AES_ECB_decrypt(const uint8_t* input, const uint8_t* key, uint8_t *output);
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void AES_ECB_encrypt(const uint8_t* input, const uint8_t* key, uint8_t *output, const uint32_t length);
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void AES_ECB_decrypt(const uint8_t* input, const uint8_t* key, uint8_t *output, const uint32_t length);
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#endif // #if defined(ECB) && ECB
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106
test.c
106
test.c
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@ -9,6 +9,7 @@
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#include "aes.h"
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static void phex(uint8_t* str);
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static void test_encrypt_ecb(void);
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static void test_decrypt_ecb(void);
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@ -17,9 +18,15 @@ static void test_encrypt_cbc(void);
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static void test_decrypt_cbc(void);
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int main(void)
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{
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#ifdef AES128
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printf("\nAES128\n\n");
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#elif defined(AES192)
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printf("\nAES192\n\n");
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#elif defined(AES256)
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printf("\nAES256\n\n");
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#endif
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test_encrypt_cbc();
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test_decrypt_cbc();
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test_decrypt_ecb();
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@ -30,12 +37,20 @@ int main(void)
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}
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// prints string as hex
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static void phex(uint8_t* str)
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{
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#ifdef AES128
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uint8_t len = 16;
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#elif defined(AES192)
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uint8_t len = 24;
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#elif defined(AES256)
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uint8_t len = 32;
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#endif
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unsigned char i;
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for(i = 0; i < 16; ++i)
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for(i = 0; i < len; ++i)
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printf("%.2x", str[i]);
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printf("\n");
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}
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@ -83,14 +98,25 @@ static void test_encrypt_ecb_verbose(void)
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static void test_encrypt_ecb(void)
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{
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uint8_t key[] = {0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c};
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#ifdef AES128
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uint8_t key[] = {0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c};
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uint8_t out[] = {0x3a, 0xd7, 0x7b, 0xb4, 0x0d, 0x7a, 0x36, 0x60, 0xa8, 0x9e, 0xca, 0xf3, 0x24, 0x66, 0xef, 0x97};
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#elif defined(AES192)
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uint8_t key[] = { 0x8e, 0x73, 0xb0, 0xf7, 0xda, 0x0e, 0x64, 0x52, 0xc8, 0x10, 0xf3, 0x2b, 0x80, 0x90, 0x79, 0xe5,
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0x62, 0xf8, 0xea, 0xd2, 0x52, 0x2c, 0x6b, 0x7b};
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uint8_t out[] = { 0xbd, 0x33, 0x4f, 0x1d, 0x6e, 0x45, 0xf2, 0x5f, 0xf7, 0x12, 0xa2, 0x14, 0x57, 0x1f, 0xa5, 0xcc };
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#elif defined(AES256)
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uint8_t key[] = { 0x60, 0x3d, 0xeb, 0x10, 0x15, 0xca, 0x71, 0xbe, 0x2b, 0x73, 0xae, 0xf0, 0x85, 0x7d, 0x77, 0x81,
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0x1f, 0x35, 0x2c, 0x07, 0x3b, 0x61, 0x08, 0xd7, 0x2d, 0x98, 0x10, 0xa3, 0x09, 0x14, 0xdf, 0xf4 };
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uint8_t out[] = { 0xf3, 0xee, 0xd1, 0xbd, 0xb5, 0xd2, 0xa0, 0x3c, 0x06, 0x4b, 0x5a, 0x7e, 0x3d, 0xb1, 0x81, 0xf8 };
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#endif
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uint8_t in[] = {0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96, 0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a};
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uint8_t out[] = {0x3a, 0xd7, 0x7b, 0xb4, 0x0d, 0x7a, 0x36, 0x60, 0xa8, 0x9e, 0xca, 0xf3, 0x24, 0x66, 0xef, 0x97};
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uint8_t buffer[16];
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AES_ECB_encrypt(in, key, buffer, 16);
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printf("ECB decrypt: ");
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printf("ECB encrypt: ");
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if(0 == memcmp((char*) out, (char*) buffer, 16))
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{
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@ -104,24 +130,35 @@ static void test_encrypt_ecb(void)
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static void test_decrypt_cbc(void)
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{
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// Example "simulating" a smaller buffer...
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#ifdef AES128
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uint8_t key[] = { 0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c };
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uint8_t iv[] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f };
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uint8_t in[] = { 0x76, 0x49, 0xab, 0xac, 0x81, 0x19, 0xb2, 0x46, 0xce, 0xe9, 0x8e, 0x9b, 0x12, 0xe9, 0x19, 0x7d,
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uint8_t in[] = { 0x76, 0x49, 0xab, 0xac, 0x81, 0x19, 0xb2, 0x46, 0xce, 0xe9, 0x8e, 0x9b, 0x12, 0xe9, 0x19, 0x7d,
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0x50, 0x86, 0xcb, 0x9b, 0x50, 0x72, 0x19, 0xee, 0x95, 0xdb, 0x11, 0x3a, 0x91, 0x76, 0x78, 0xb2,
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0x73, 0xbe, 0xd6, 0xb8, 0xe3, 0xc1, 0x74, 0x3b, 0x71, 0x16, 0xe6, 0x9e, 0x22, 0x22, 0x95, 0x16,
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0x3f, 0xf1, 0xca, 0xa1, 0x68, 0x1f, 0xac, 0x09, 0x12, 0x0e, 0xca, 0x30, 0x75, 0x86, 0xe1, 0xa7 };
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uint8_t out[] = { 0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96, 0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a,
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#elif defined(AES192)
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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};
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uint8_t in[] = { 0x4f, 0x02, 0x1d, 0xb2, 0x43, 0xbc, 0x63, 0x3d, 0x71, 0x78, 0x18, 0x3a, 0x9f, 0xa0, 0x71, 0xe8,
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0xb4, 0xd9, 0xad, 0xa9, 0xad, 0x7d, 0xed, 0xf4, 0xe5, 0xe7, 0x38, 0x76, 0x3f, 0x69, 0x14, 0x5a,
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0x57, 0x1b, 0x24, 0x20, 0x12, 0xfb, 0x7a, 0xe0, 0x7f, 0xa9, 0xba, 0xac, 0x3d, 0xf1, 0x02, 0xe0,
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0x08, 0xb0, 0xe2, 0x79, 0x88, 0x59, 0x88, 0x81, 0xd9, 0x20, 0xa9, 0xe6, 0x4f, 0x56, 0x15, 0xcd };
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#elif defined(AES256)
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uint8_t key[] = { 0x60, 0x3d, 0xeb, 0x10, 0x15, 0xca, 0x71, 0xbe, 0x2b, 0x73, 0xae, 0xf0, 0x85, 0x7d, 0x77, 0x81,
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0x1f, 0x35, 0x2c, 0x07, 0x3b, 0x61, 0x08, 0xd7, 0x2d, 0x98, 0x10, 0xa3, 0x09, 0x14, 0xdf, 0xf4 };
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uint8_t in[] = { 0xf5, 0x8c, 0x4c, 0x04, 0xd6, 0xe5, 0xf1, 0xba, 0x77, 0x9e, 0xab, 0xfb, 0x5f, 0x7b, 0xfb, 0xd6,
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0x9c, 0xfc, 0x4e, 0x96, 0x7e, 0xdb, 0x80, 0x8d, 0x67, 0x9f, 0x77, 0x7b, 0xc6, 0x70, 0x2c, 0x7d,
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0x39, 0xf2, 0x33, 0x69, 0xa9, 0xd9, 0xba, 0xcf, 0xa5, 0x30, 0xe2, 0x63, 0x04, 0x23, 0x14, 0x61,
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0xb2, 0xeb, 0x05, 0xe2, 0xc3, 0x9b, 0xe9, 0xfc, 0xda, 0x6c, 0x19, 0x07, 0x8c, 0x6a, 0x9d, 0x1b };
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#endif
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uint8_t iv[] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f };
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uint8_t out[] = { 0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96, 0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a,
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0xae, 0x2d, 0x8a, 0x57, 0x1e, 0x03, 0xac, 0x9c, 0x9e, 0xb7, 0x6f, 0xac, 0x45, 0xaf, 0x8e, 0x51,
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0x30, 0xc8, 0x1c, 0x46, 0xa3, 0x5c, 0xe4, 0x11, 0xe5, 0xfb, 0xc1, 0x19, 0x1a, 0x0a, 0x52, 0xef,
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0xf6, 0x9f, 0x24, 0x45, 0xdf, 0x4f, 0x9b, 0x17, 0xad, 0x2b, 0x41, 0x7b, 0xe6, 0x6c, 0x37, 0x10 };
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uint8_t buffer[64];
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AES_CBC_decrypt_buffer(buffer+0, in+0, 16, key, iv);
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AES_CBC_decrypt_buffer(buffer+16, in+16, 16, 0, 0);
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AES_CBC_decrypt_buffer(buffer+32, in+32, 16, 0, 0);
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AES_CBC_decrypt_buffer(buffer+48, in+48, 16, 0, 0);
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AES_CBC_decrypt_buffer(buffer, in, 64, key, iv);
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printf("CBC decrypt: ");
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@ -137,16 +174,32 @@ static void test_decrypt_cbc(void)
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static void test_encrypt_cbc(void)
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{
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#ifdef AES128
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uint8_t key[] = { 0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c };
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uint8_t out[] = { 0x76, 0x49, 0xab, 0xac, 0x81, 0x19, 0xb2, 0x46, 0xce, 0xe9, 0x8e, 0x9b, 0x12, 0xe9, 0x19, 0x7d,
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0x50, 0x86, 0xcb, 0x9b, 0x50, 0x72, 0x19, 0xee, 0x95, 0xdb, 0x11, 0x3a, 0x91, 0x76, 0x78, 0xb2,
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0x73, 0xbe, 0xd6, 0xb8, 0xe3, 0xc1, 0x74, 0x3b, 0x71, 0x16, 0xe6, 0x9e, 0x22, 0x22, 0x95, 0x16,
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0x3f, 0xf1, 0xca, 0xa1, 0x68, 0x1f, 0xac, 0x09, 0x12, 0x0e, 0xca, 0x30, 0x75, 0x86, 0xe1, 0xa7 };
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#elif defined(AES192)
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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};
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uint8_t out[] = { 0x4f, 0x02, 0x1d, 0xb2, 0x43, 0xbc, 0x63, 0x3d, 0x71, 0x78, 0x18, 0x3a, 0x9f, 0xa0, 0x71, 0xe8,
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0xb4, 0xd9, 0xad, 0xa9, 0xad, 0x7d, 0xed, 0xf4, 0xe5, 0xe7, 0x38, 0x76, 0x3f, 0x69, 0x14, 0x5a,
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0x57, 0x1b, 0x24, 0x20, 0x12, 0xfb, 0x7a, 0xe0, 0x7f, 0xa9, 0xba, 0xac, 0x3d, 0xf1, 0x02, 0xe0,
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0x08, 0xb0, 0xe2, 0x79, 0x88, 0x59, 0x88, 0x81, 0xd9, 0x20, 0xa9, 0xe6, 0x4f, 0x56, 0x15, 0xcd };
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#elif defined(AES256)
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uint8_t key[] = { 0x60, 0x3d, 0xeb, 0x10, 0x15, 0xca, 0x71, 0xbe, 0x2b, 0x73, 0xae, 0xf0, 0x85, 0x7d, 0x77, 0x81,
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0x1f, 0x35, 0x2c, 0x07, 0x3b, 0x61, 0x08, 0xd7, 0x2d, 0x98, 0x10, 0xa3, 0x09, 0x14, 0xdf, 0xf4 };
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uint8_t out[] = { 0xf5, 0x8c, 0x4c, 0x04, 0xd6, 0xe5, 0xf1, 0xba, 0x77, 0x9e, 0xab, 0xfb, 0x5f, 0x7b, 0xfb, 0xd6,
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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];
|
||||
|
||||
AES_CBC_encrypt_buffer(buffer, in, 64, key, iv);
|
||||
|
|
@ -166,9 +219,20 @@ 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];
|
||||
|
||||
AES_ECB_decrypt(in, key, buffer, 16);
|
||||
|
|
|
|||
Loading…
Reference in New Issue