rfcv函数实现_OpenSSL AES_ctr128_encrypt（）作为伪随机函数在RFC3711（SRTP）

128位的主密钥：E1F97A0D3E018BE0D64FA32C06DE4139

112位输入矢量：0EC675AD498AFEEBB6960B3AABE6

16位计数器：0000

喂奶时的级联将112位输入向量和16位计数器转换为AES_ctr128_encrypt()我是不是得到预期的输出附录B.3的RFC3711列出了。(根据RFC3711的附录B.3)

预期的密文的输出应该是：

C61E7A93744F39EE10734AFE3FF7A087

实际的密文输出我跟我的代码得到的是： C8D80F3E3DC5C705A6E541C49411A087

(请注意，只有最后的16位与预期的一样)。

这是为什么？我究竟做错了什么？

这里是我的代码： // COMPILE WITH:

// g++ -o aesctr128 -lcrypto aesctr128_test.cpp

#include

#include

#include

struct counter_state

{

unsigned char ivec[16]; // ivec[0..13] (high-order bytes) is 'IV'/ivec[14..15] (low-order bytes) is 'counter'

unsigned int num; // Block byte offset

unsigned char ecount[16];

};

int reset_state(struct counter_state *state, const unsigned char iv[14])

{

// aes_ctr128_encrypt() requires 'num' and 'ecount' to be set to zero on its first call

state->num = 0;

memset(state->ecount, 0, 16);

// Clear BOTH 14 high-order bytes [0..13] for 'IV' *AND* 2 low-order bytes [14..15] for 'counter'

memset(state->ivec, 0, 16);

// Copy 'IV' into 14 high-order bytes [0..13] -- 2 low-order bytes [14..15] remain zero

memcpy(state->ivec, iv, 14);

return 0;

}

int pseudorandom_function2()

{

int rc = 0;

AES_KEY aes_key;

struct counter_state state;

unsigned char key[16]; // Master key (16-byte -- 128 bits)

unsigned char iv[14]; // Input vector (14-byte -- 112 bits)

unsigned char x[16]; // 16-byte concatenation of 14-byte Input Vector and 2-byte counter (00)

unsigned char out[16]; // 16-byte encrypted ciphertext

memset(key, 0, sizeof(key));

key[0] = 0xE1;

key[1] = 0xF9;

key[2] = 0x7A;

key[3] = 0x0D;

key[4] = 0x3E;

key[5] = 0x01;

key[6] = 0x8B;

key[7] = 0xE0;

key[8] = 0xD6;

key[9] = 0x4F;

key[10] = 0xA3;

key[11] = 0x2C;

key[12] = 0x06;

key[13] = 0xDE;

key[14] = 0x41;

key[15] = 0x39;

memset(iv, 0, sizeof(iv));

iv[0] = 0x0E;

iv[1] = 0xC6;

iv[2] = 0x75;

iv[3] = 0xAD;

iv[4] = 0x49;

iv[5] = 0x8A;

iv[6] = 0xFE;

iv[7] = 0xEB;

iv[8] = 0xB6;

iv[9] = 0x96;

iv[10] = 0x0B;

iv[11] = 0x3A;

iv[12] = 0xAB;

iv[13] = 0xE6;

memset(x, 0, sizeof(x));

memcpy(x, iv, 14);

// Initialize encryption KEY

rc = AES_set_encrypt_key(key, 128, &aes_key);

if (rc < 0)

{

return -1;

}

reset_state(&state, iv);

memset(out, 0, sizeof(out));

printf("ivec BEFORE: ");

for (int i = 0; i < 16; i++) {

printf("%02x", state.ivec[i]);

}

printf("\n");

// Encrypt given x input using key to out

AES_ctr128_encrypt(x, out, AES_BLOCK_SIZE, &aes_key, state.ivec, state.ecount, &state.num);

for (int k = 0; k < 16; k++)

{

printf("pseudorandom_function2: out[%d] = %02x\n", k, out[k]);

}

printf("ivec AFTER: ");

for (int i = 0; i < 16; i++) {

printf("%02x", state.ivec[i]);

}

printf("\n");

return 0;

}

int main(int argc, char *argv[])

{

pseudorandom_function2();

return 0;

}

实际输出我的屏幕上： ivec BEFORE: 0ec675ad498afeebb6960b3aabe60000

pseudorandom_function2: out[0] = c8

pseudorandom_function2: out[1] = d8

pseudorandom_function2: out[2] = 0f

pseudorandom_function2: out[3] = 3e

pseudorandom_function2: out[4] = 3d

pseudorandom_function2: out[5] = c5

pseudorandom_function2: out[6] = c7

pseudorandom_function2: out[7] = 05

pseudorandom_function2: out[8] = a6

pseudorandom_function2: out[9] = e5

pseudorandom_function2: out[10] = 41

pseudorandom_function2: out[11] = c4

pseudorandom_function2: out[12] = 94

pseudorandom_function2: out[13] = 11

pseudorandom_function2: out[14] = a0

pseudorandom_function2: out[15] = 87

ivec AFTER: 0ec675ad498afeebb6960b3aabe60001

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