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sys/crypto/aesni/aesni_ccm.c

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/*-
* Copyright (c) 2014 The FreeBSD Foundation
* Copyright (c) 2018 iXsystems, Inc
* All rights reserved.
*
* This software was developed by John-Mark Gurney under
* the sponsorship of the FreeBSD Foundation and
* Rubicon Communications, LLC (Netgate).
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*
* $FreeBSD$
*
* This file implements AES-CCM+CBC-MAC, as described
* at https://tools.ietf.org/html/rfc3610, using Intel's
* AES-NI instructions.
*
*/
#include <sys/types.h>
#include <sys/endian.h>
#include <sys/param.h>
#ifdef _KERNEL
#include <sys/systm.h>
#include <crypto/aesni/aesni.h>
#include <crypto/aesni/aesni_os.h>
#include <crypto/aesni/aesencdec.h>
#define AESNI_ENC(d, k, nr) aesni_enc(nr-1, (const __m128i*)k, d)
#else
#include <stdio.h>
#include <stdint.h>
#include <stdarg.h>
#include <strings.h>
#include <err.h>
#endif
#include <wmmintrin.h>
#include <emmintrin.h>
#include <smmintrin.h>
typedef union {
__m128i block;
uint8_t bytes[sizeof(__m128i)];
} aes_block_t;
#ifndef _KERNEL
static void
panic(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
verrx(1, fmt, ap);
va_end(ap);
}
#endif
#ifdef CRYPTO_DEBUG
static void
PrintBlock(const char *label, __m128i b)
{
uint8_t *ptr = (uint8_t*)&b;
printf("%s: ", label);
for (size_t i = 0; i < sizeof(b); i++)
printf("%02x ", ptr[i]);
printf("\n");
}
#endif
#ifdef STANDALONE
static void PrintHex(const void *, size_t);
#endif
#ifndef _KERNEL
/*
* Convenience wrapper to do AES encryption.
*/
static inline __m128i
aes_encrypt(__m128i data, const unsigned char *k, int nr)
{
int i;
__m128 retval = data;
const __m128i *key = (const void*)k;
retval = _mm_xor_si128(retval, key[0]);
for (i = 1; i < nr; i++) {
retval = _mm_aesenc_si128(retval, key[i]);
}
retval = _mm_aesenclast_si128(retval, key[nr]);
return retval;
}
#endif
/*
* Encrypt a single 128-bit block after
* doing an xor. This is also used to
* decrypt (yay symmetric encryption).
*/
static inline __m128i
xor_and_encrypt(__m128i a, __m128i b, const unsigned char *k, int nr)
{
__m128 retval = _mm_xor_si128(a, b);
#ifdef CRYPTO_DEBUG
PrintBlock("\ta\t", a);
PrintBlock("\tb\t", b);
PrintBlock("\tresult\t", retval);
#endif
retval = AESNI_ENC(retval, k, nr);
return retval;
}
/*
* put value at the end of block, starting at offset.
* (This goes backwards, putting bytes in *until* it
* reaches offset.)
*/
static void
append_int(size_t value, __m128i *block, size_t offset)
{
int indx = sizeof(*block) - 1;
uint8_t *bp = (uint8_t*)block;
while (indx > (sizeof(*block) - offset)) {
bp[indx] = value & 0xff;
indx--;
value >>= 8;
}
}
/*
* Start the CBC-MAC process. This handles the auth data.
*/
static __m128i
cbc_mac_start(const unsigned char *auth_data, size_t auth_len,
const unsigned char *nonce, size_t nonce_len,
const unsigned char *key, int nr,
size_t data_len, size_t tag_len)
{
aes_block_t retval, temp_block;
/* This defines where the message length goes */
int L = sizeof(__m128i) - 1 - nonce_len;
/*
* Set up B0 here. This has the flags byte,
* followed by the nonce, followed by the
* length of the message.
*/
retval.block = _mm_setzero_si128();
retval.bytes[0] = (auth_len ? 1 : 0) * 64 |
(((tag_len - 2) / 2) * 8) |
(L - 1);
bcopy(nonce, &retval.bytes[1], nonce_len);
append_int(data_len, &retval.block, L+1);
#ifdef CRYPTO_DEBUG
PrintBlock("Plain B0", retval.block);
#endif
retval.block = AESNI_ENC(retval.block, key, nr);
if (auth_len) {
/*
* We need to start by appending the length descriptor.
*/
uint32_t auth_amt;
size_t copy_amt;
const uint8_t *auth_ptr = auth_data;
temp_block.block = _mm_setzero_si128();
if (auth_len < ((1<<16) - (1<<8))) {
uint16_t *ip = (uint16_t*)&temp_block;
*ip = htobe16(auth_len);
auth_amt = 2;
} else {
/*
* The current calling convention means that
* there can never be more than 4g of authentication
* data, so we don't handle the 0xffff case.
*/
uint32_t *ip = (uint32_t*)&temp_block.bytes[2];
temp_block.bytes[0] = 0xff;
temp_block.bytes[1] = 0xfe;
*ip = htobe32(auth_len);
auth_amt = 2 + sizeof(*ip);
}
/*
* Need to copy abytes into blocks. The first block is
* already partially filled, by auth_amt, so we need
* to handle that. The last block needs to be zero padded.
*/
copy_amt = MIN(auth_len - auth_amt, sizeof(temp_block) - auth_amt);
bcopy(auth_ptr, &temp_block.bytes[auth_amt], copy_amt);
auth_ptr += copy_amt;
retval.block = xor_and_encrypt(retval.block, temp_block.block, key, nr);
while (auth_ptr < auth_data + auth_len) {
copy_amt = MIN((auth_data + auth_len) - auth_ptr, sizeof(temp_block));
if (copy_amt < sizeof(retval))
bzero(&temp_block, sizeof(temp_block));
bcopy(auth_ptr, &temp_block, copy_amt);
retval.block = xor_and_encrypt(retval.block, temp_block.block, key, nr);
auth_ptr += copy_amt;
}
}
return retval.block;
}
/*
* Implement AES CCM+CBC-MAC encryption and authentication.
*
* A couple of notes:
* The specification allows for a different number of tag lengths;
* however, they're always truncated from 16 bytes, and the tag
* length isn't passed in. (This could be fixed by changing the
* code in aesni.c:aesni_cipher_crypt().)
* Similarly, although the nonce length is passed in, the
* OpenCrypto API that calls us doesn't have a way to set the nonce
* other than by having different crypto algorithm types. As a result,
* this is currently always called with nlen=12; this means that we
* also have a maximum message length of 16MBytes. And similarly,
* since abyes is limited to a 32 bit value here, the AAD is
* limited to 4gbytes or less.
*/
void
AES_CCM_encrypt(const unsigned char *in, unsigned char *out,
const unsigned char *addt, const unsigned char *nonce,
unsigned char *tag, uint32_t nbytes, uint32_t abytes, int nlen,
const unsigned char *key, int nr)
{
static const int tag_length = 16; /* 128 bits */
int L;
int counter = 1; /* S0 has 0, S1 has 1 */
size_t copy_amt, total = 0;
aes_block_t s0, last_block, current_block, s_x, temp_block;
CRYPTDEB("%s(%p, %p, %p, %p, %p, %u, %u, %d, %p, %d)\n",
__func__, in, out, addt, nonce, tag, nbytes, abytes, nlen, key, nr);
if (nbytes == 0)
return;
if (nlen < 0 || nlen > 15)
panic("%s: bad nonce length %d", __FUNCTION__, nlen);
/*
* We need to know how many bytes to use to describe
* the length of the data. Normally, nlen should be
* 12, which leaves us 3 bytes to do that -- 16mbytes of
* data to encrypt. But it can be longer or shorter;
* this impacts the length of the message.
*/
L = sizeof(__m128i) - 1 - nlen;
/*
* Now, this shouldn't happen, but let's make sure that
* the data length isn't too big.
*/
if (nbytes > ((1 << (8 * L)) - 1))
panic("%s: nbytes is %u, but length field is %d bytes",
__FUNCTION__, nbytes, L);
/*
* Clear out the blocks
*/
explicit_bzero(&s0, sizeof(s0));
explicit_bzero(&current_block, sizeof(current_block));
last_block.block = cbc_mac_start(addt, abytes, nonce, nlen,
key, nr, nbytes, tag_length);
/* s0 has flags, nonce, and then 0 */
s0.bytes[0] = L-1; /* but the flags byte only has L' */
bcopy(nonce, &s0.bytes[1], nlen);
#ifdef CRYPTO_DEBUG
PrintBlock("s0", s0.block);
#endif
/*
* Now to cycle through the rest of the data.
*/
bcopy(&s0, &s_x, sizeof(s0));
while (total < nbytes) {
/*
* Copy the plain-text data into temp_block.
* This may need to be zero-padded.
*/
copy_amt = MIN(nbytes - total, sizeof(temp_block));
bcopy(in+total, &temp_block, copy_amt);
if (copy_amt < sizeof(temp_block)) {
bzero(&temp_block.bytes[copy_amt],
sizeof(temp_block) - copy_amt);
}
#ifdef CRYPTO_DEBUG
PrintBlock("Plain text", temp_block.block);
#endif
last_block.block = xor_and_encrypt(last_block.block,
temp_block.block, key, nr);
/* Put the counter into the s_x block */
append_int(counter++, &s_x.block, L+1);
/* Encrypt that */
__m128i X = AESNI_ENC(s_x.block, key, nr);
/* XOR the plain-text with the encrypted counter block */
temp_block.block = _mm_xor_si128(temp_block.block, X);
#ifdef CRYPTO_DEBUG
PrintBlock("Encrypted block", temp_block.block);
#endif
/* And copy it out */
bcopy(&temp_block, out+total, copy_amt);
total += copy_amt;
}
/*
* Allgedly done with it! Except for the tag.
*/
#ifdef CRYPTO_DEBUG
PrintBlock("Final last block", last_block.block);
#endif
s0.block = AESNI_ENC(s0.block, key, nr);
temp_block.block = _mm_xor_si128(s0.block, last_block.block);
#ifdef CRYPTO_DEBUG
printf("Tag length %d; ", tag_length);
PrintBlock("Final tag", temp_block.block);
#endif
bcopy(&temp_block, tag, tag_length);
return;
}
/*
* Implement AES CCM+CBC-MAC decryption and authentication.
* Returns 0 on failure, 1 on success.
*
* The primary difference here is that each encrypted block
* needs to be hashed&encrypted after it is decrypted (since
* the CBC-MAC is based on the plain text). This means that
* we do the decryption twice -- first to verify the tag,
* and second to decrypt and copy it out.
*
* To avoid annoying code copying, we implement the main
* loop as a separate function.
*
* Call with out as NULL to not store the decrypted results;
* call with hashp as NULL to not run the authentication.
* Calling with neither as NULL does the decryption and
* authentication as a single pass (which is not allowed
* per the specification, really).
*
* If hashp is non-NULL, it points to the post-AAD computed
* checksum.
*/
static void
decrypt_loop(const unsigned char *in, unsigned char *out, size_t nbytes,
aes_block_t s0, size_t nonce_length, aes_block_t *hashp,
const unsigned char *key, int nr)
{
size_t total = 0;
aes_block_t s_x = s0, hash_block;
int counter = 1;
const size_t L = sizeof(__m128i) - 1 - nonce_length;
__m128i pad_block;
/*
* The starting hash (post AAD, if any).
*/
if (hashp)
hash_block = *hashp;
while (total < nbytes) {
aes_block_t temp_block;
size_t copy_amt = MIN(nbytes - total, sizeof(temp_block));
if (copy_amt < sizeof(temp_block)) {
temp_block.block = _mm_setzero_si128();
}
bcopy(in+total, &temp_block, copy_amt);
/*
* temp_block has the current block of input data,
* zero-padded if necessary. This is used in computing
* both the decrypted data, and the authentication hash.
*/
append_int(counter++, &s_x.block, L+1);
/*
* The hash is computed based on the decrypted data.
*/
pad_block = AESNI_ENC(s_x.block, key, nr);
if (copy_amt < sizeof(temp_block)) {
/*
* Need to pad out both blocks with 0.
*/
uint8_t *end_of_buffer = (uint8_t*)&pad_block;
bzero(&temp_block.bytes[copy_amt],
sizeof(temp_block) - copy_amt);
bzero(end_of_buffer + copy_amt,
sizeof(temp_block) - copy_amt);
}
temp_block.block = _mm_xor_si128(temp_block.block,
pad_block);
if (out)
bcopy(&temp_block, out+total, copy_amt);
if (hashp)
hash_block.block = xor_and_encrypt(hash_block.block,
temp_block.block, key, nr);
total += copy_amt;
}
explicit_bzero(&pad_block, sizeof(pad_block));
if (hashp)
*hashp = hash_block;
return;
}
/*
* The exposed decryption routine. This is practically a
* copy of the encryption routine, except that the order
* in which the hash is created is changed.
* XXX combine the two functions at some point!
*/
int
AES_CCM_decrypt(const unsigned char *in, unsigned char *out,
const unsigned char *addt, const unsigned char *nonce,
const unsigned char *tag, uint32_t nbytes, uint32_t abytes, int nlen,
const unsigned char *key, int nr)
{
static const int tag_length = 16; /* 128 bits */
int L;
aes_block_t s0, last_block, current_block, s_x, temp_block;
CRYPTDEB("%s(%p, %p, %p, %p, %p, %u, %u, %d, %p, %d)\n",
__func__, in, out, addt, nonce, tag, nbytes, abytes, nlen, key, nr);
if (nbytes == 0)
return 1; // No message means no decryption!
if (nlen < 0 || nlen > 15)
cemUnsubmitted
Done
Inline Actions

Usually spelled CRYPTDEB() and __func__.

cem: Usually spelled `CRYPTDEB()` and `__func__`.
panic("%s: bad nonce length %d", __FUNCTION__, nlen);
/*
* We need to know how many bytes to use to describe
* the length of the data. Normally, nlen should be
* 12, which leaves us 3 bytes to do that -- 16mbytes of
* data to encrypt. But it can be longer or shorter.
*/
L = sizeof(__m128i) - 1 - nlen;
/*
* Now, this shouldn't happen, but let's make sure that
* the data length isn't too big.
*/
if (nbytes > ((1 << (8 * L)) - 1))
panic("%s: nbytes is %u, but length field is %d bytes",
__FUNCTION__, nbytes, L);
/*
* Clear out the blocks
*/
s0.block = _mm_setzero_si128();
current_block = s0;
last_block.block = cbc_mac_start(addt, abytes, nonce, nlen,
key, nr, nbytes, tag_length);
/* s0 has flags, nonce, and then 0 */
s0.bytes[0] = L-1; /* but the flags byte only has L' */
bcopy(nonce, &s0.bytes[1], nlen);
#ifdef CRYPTO_DEBUG
PrintBlock("s0", s0.block);
#endif
/*
* Now to cycle through the rest of the data.
*/
s_x = s0;
decrypt_loop(in, NULL, nbytes, s0, nlen, &last_block, key, nr);
/*
* Compare the tag.
*/
temp_block.block = _mm_xor_si128(AESNI_ENC(s0.block, key, nr),
last_block.block);
if (bcmp(&temp_block, tag, tag_length) != 0) {
#ifdef CRYPTO_DEBUG
PrintBlock("Computed tag", temp_block.block);
PrintBlock("Input tag ", *(const __m128i*)tag);
#endif
return 0;
}
/*
* Push out the decryption results this time.
*/
decrypt_loop(in, out, nbytes, s0, nlen, NULL, key, nr);
return 1;
}
#ifdef STANDALONE
/*
* Used for testing
*/
/*
* The hard-coded key expansion for an all-zeroes key.
*/
static uint8_t expanded_zero_key[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x62, 0x63, 0x63, 0x63, 0x62, 0x63, 0x63, 0x63, 0x62, 0x63, 0x63, 0x63, 0x62, 0x63, 0x63, 0x63,
0xaa, 0xfb, 0xfb, 0xfb, 0xaa, 0xfb, 0xfb, 0xfb, 0xaa, 0xfb, 0xfb, 0xfb, 0xaa, 0xfb, 0xfb, 0xfb,
0x6f, 0x6c, 0x6c, 0xcf, 0x0d, 0x0f, 0x0f, 0xac, 0x6f, 0x6c, 0x6c, 0xcf, 0x0d, 0x0f, 0x0f, 0xac,
0x7d, 0x8d, 0x8d, 0x6a, 0xd7, 0x76, 0x76, 0x91, 0x7d, 0x8d, 0x8d, 0x6a, 0xd7, 0x76, 0x76, 0x91,
0x53, 0x54, 0xed, 0xc1, 0x5e, 0x5b, 0xe2, 0x6d, 0x31, 0x37, 0x8e, 0xa2, 0x3c, 0x38, 0x81, 0x0e,
0x96, 0x8a, 0x81, 0xc1, 0x41, 0xfc, 0xf7, 0x50, 0x3c, 0x71, 0x7a, 0x3a, 0xeb, 0x07, 0x0c, 0xab,
0x9e, 0xaa, 0x8f, 0x28, 0xc0, 0xf1, 0x6d, 0x45, 0xf1, 0xc6, 0xe3, 0xe7, 0xcd, 0xfe, 0x62, 0xe9,
0x2b, 0x31, 0x2b, 0xdf, 0x6a, 0xcd, 0xdc, 0x8f, 0x56, 0xbc, 0xa6, 0xb5, 0xbd, 0xbb, 0xaa, 0x1e,
0x64, 0x06, 0xfd, 0x52, 0xa4, 0xf7, 0x90, 0x17, 0x55, 0x31, 0x73, 0xf0, 0x98, 0xcf, 0x11, 0x19,
0x6d, 0xbb, 0xa9, 0x0b, 0x07, 0x76, 0x75, 0x84, 0x51, 0xca, 0xd3, 0x31, 0xec, 0x71, 0x79, 0x2f,
0xe7, 0xb0, 0xe8, 0x9c, 0x43, 0x47, 0x78, 0x8b, 0x16, 0x76, 0x0b, 0x7b, 0x8e, 0xb9, 0x1a, 0x62,
0x74, 0xed, 0x0b, 0xa1, 0x73, 0x9b, 0x7e, 0x25, 0x22, 0x51, 0xad, 0x14, 0xce, 0x20, 0xd4, 0x3b,
0x10, 0xf8, 0x0a, 0x17, 0x53, 0xbf, 0x72, 0x9c, 0x45, 0xc9, 0x79, 0xe7, 0xcb, 0x70, 0x63, 0x85,
};
static uint8_t expanded_zero_key_2[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x62, 0x63, 0x63, 0x63, 0x62, 0x63, 0x63, 0x63, 0x62, 0x63, 0x63, 0x63, 0x62, 0x63, 0x63, 0x63,
0xaa, 0xfb, 0xfb, 0xfb, 0xaa, 0xfb, 0xfb, 0xfb, 0xaa, 0xfb, 0xfb, 0xfb, 0xaa, 0xfb, 0xfb, 0xfb,
0x6f, 0x6c, 0x6c, 0xcf, 0x0d, 0x0f, 0x0f, 0xac, 0x6f, 0x6c, 0x6c, 0xcf, 0x0d, 0x0f, 0x0f, 0xac,
0x7d, 0x8d, 0x8d, 0x6a, 0xd7, 0x76, 0x76, 0x91, 0x7d, 0x8d, 0x8d, 0x6a, 0xd7, 0x76, 0x76, 0x91,
0x53, 0x54, 0xed, 0xc1, 0x5e, 0x5b, 0xe2, 0x6d, 0x31, 0x37, 0x8e, 0xa2, 0x3c, 0x38, 0x81, 0x0e,
0x96, 0x8a, 0x81, 0xc1, 0x41, 0xfc, 0xf7, 0x50, 0x3c, 0x71, 0x7a, 0x3a, 0xeb, 0x07, 0x0c, 0xab,
0x9e, 0xaa, 0x8f, 0x28, 0xc0, 0xf1, 0x6d, 0x45, 0xf1, 0xc6, 0xe3, 0xe7, 0xcd, 0xfe, 0x62, 0xe9,
0x2b, 0x31, 0x2b, 0xdf, 0x6a, 0xcd, 0xdc, 0x8f, 0x56, 0xbc, 0xa6, 0xb5, 0xbd, 0xbb, 0xaa, 0x1e,
0x64, 0x06, 0xfd, 0x52, 0xa4, 0xf7, 0x90, 0x17, 0x55, 0x31, 0x73, 0xf0, 0x98, 0xcf, 0x11, 0x19,
0x6d, 0xbb, 0xa9, 0x0b, 0x07, 0x76, 0x75, 0x84, 0x51, 0xca, 0xd3, 0x31, 0xec, 0x71, 0x79, 0x2f,
0xe7, 0xb0, 0xe8, 0x9c, 0x43, 0x47, 0x78, 0x8b, 0x16, 0x76, 0x0b, 0x7b, 0x8e, 0xb9, 0x1a, 0x62,
0x74, 0xed, 0x0b, 0xa1, 0x73, 0x9b, 0x7e, 0x25, 0x22, 0x51, 0xad, 0x14, 0xce, 0x20, 0xd4, 0x3b,
0x10, 0xf8, 0x0a, 0x17, 0x53, 0xbf, 0x72, 0x9c, 0x45, 0xc9, 0x79, 0xe7, 0xcb, 0x70, 0x63, 0x85,
};
static void
PrintHex(const void *bytes, size_t len)
{
const uint8_t *b = bytes;
for (size_t x = 0; x < len; x++)
printf("%02x ", b[x]);
printf("\n");
return;
}
int
main(int ac, char **av)
{
uint8_t tag[16];
uint8_t nonce[12] = { 0 };
unsigned char aad[] = "How now brown cow";
// unsigned char plain[] = "Four score and seven years ago, our forefathers brought Bill & Ted";
unsigned char plain[4] = "abcd";
unsigned char crypt[sizeof(plain)];
unsigned char decrypted[sizeof(plain)];
uint8_t key[256 / 8] = { 0 };
int nrounds = 14; // For a 256-bit key, use 14 rounds
int rv;
printf("Plaintext: "); PrintHex(plain, sizeof(plain));
printf("aad size = %zx, nonce size = %zx, tag size = %zx\n", sizeof(aad), sizeof(nonce), sizeof(tag));
AES_CCM_encrypt(plain, crypt, aad, nonce, tag,
sizeof(plain), sizeof(aad), sizeof(nonce),
(const unsigned char *)expanded_zero_key, nrounds);
printf("Tag: "); PrintHex(tag, sizeof(tag));
printf("Crypt: "); PrintHex(crypt, sizeof(crypt));
rv = AES_CCM_decrypt(crypt, decrypted, aad, nonce, tag,
sizeof(plain), sizeof(aad), sizeof(nonce),
(const unsigned char *)expanded_zero_key_2, nrounds);
printf("%s Decrypted: ", rv == 1 ? "Successfully" : "Unsuccessfully");
PrintHex(decrypted, sizeof(decrypted));
return 0;
}
#endif