static int
int_update(EVP_MD_CTX *ctx, const void *data, size_t count)
{
if (!CMAC_Update(ctx->pctx->data, data, count))
return 0;
return 1;
}
static int print_cmac_gen(const EVP_CIPHER *cipher, FILE *out,
unsigned char *Key, int Klen,
unsigned char *Msg, int Mlen,
int Tlen)
{
int rc, i;
size_t reslen;
unsigned char res[128];
CMAC_CTX *cmac_ctx = CMAC_CTX_new();
CMAC_Init(cmac_ctx, Key, Klen, cipher, 0);
CMAC_Update(cmac_ctx, Msg, Mlen);
if (!CMAC_Final(cmac_ctx, res, &reslen))
{
fputs("Error calculating CMAC\n", stderr);
rc = 0;
}
else if (Tlen > (int)reslen)
{
fputs("Parameter error, Tlen > CMAC length\n", stderr);
rc = 0;
}
else
{
fputs("Mac = ", out);
for (i = 0; i < Tlen; i++)
fprintf(out, "%02x", res[i]);
fputs("\n", out);
rc = 1;
}
CMAC_CTX_free(cmac_ctx);
return rc;
}
sgx_status_t sgx_cmac128_msg(const sgx_key_128bit_t key, const uint8_t *p_src, unsigned int src_len, sgx_mac_t *p_mac)
{
if(!key || !p_src || src_len == 0 || !p_mac)
{
return SGX_ERROR_INVALID_PARAMETER;
}
CMAC_CTX *cmac_ctx = NULL;
size_t mac_len;
if(!(cmac_ctx = CMAC_CTX_new()))
{
return SGX_ERROR_OUT_OF_MEMORY;
}
if(!CMAC_Init(cmac_ctx, key, sizeof(sgx_key_128bit_t), EVP_aes_128_cbc(), NULL))
{
CMAC_CTX_free(cmac_ctx);
return SGX_ERROR_UNEXPECTED;
}
if(!CMAC_Update(cmac_ctx, p_src, src_len))
{
CMAC_CTX_free(cmac_ctx);
return SGX_ERROR_UNEXPECTED;
}
if(!CMAC_Final(cmac_ctx, (uint8_t *)p_mac, &mac_len))
{
CMAC_CTX_free(cmac_ctx);
return SGX_ERROR_UNEXPECTED;
}
CMAC_CTX_free(cmac_ctx);
assert(mac_len == sizeof(sgx_mac_t));
return SGX_SUCCESS;
}
BUF_MEM *
cmac(CMAC_CTX *ctx, const EVP_CIPHER *type, const BUF_MEM * key,
const BUF_MEM * in, size_t maclen)
{
CMAC_CTX * cmac_ctx = NULL;
BUF_MEM * out = NULL, * tmp = NULL;
size_t cmac_len = 0;
check((key && in && type), "Invalid arguments");
check((key->length >= (size_t) EVP_CIPHER_key_length(type)),
"Key is too short");
if (ctx)
cmac_ctx = ctx;
else {
cmac_ctx = CMAC_CTX_new();
}
/* Initialize the CMAC context, feed in the data, and get the required
* output buffer size */
if (!cmac_ctx ||
!CMAC_Init(cmac_ctx, key->data, EVP_CIPHER_key_length(type),
type, NULL) ||
!CMAC_Update(cmac_ctx, in->data, in->length) ||
!CMAC_Final(cmac_ctx, NULL, &cmac_len))
goto err;
/* get buffer in required size */
out = BUF_MEM_create(cmac_len);
if (!out)
goto err;
/* get the actual CMAC */
if (!CMAC_Final(cmac_ctx, (unsigned char*) out->data, &out->length))
goto err;
/* Truncate the CMAC if necessary */
if (cmac_len > maclen) {
tmp = BUF_MEM_create_init(out->data, maclen);
BUF_MEM_free(out);
out = tmp;
}
if (!ctx)
CMAC_CTX_free(cmac_ctx);
return out;
err:
if (cmac_ctx && !ctx) {
CMAC_CTX_free(cmac_ctx);
}
if (out) {
BUF_MEM_free(out);
}
return NULL;
}
/* 7.3.45 */
int SAF_MacUpdate(
void *hKeyHandle,
const unsigned char *pucInData,
unsigned int uiInDataLen)
{
int ret = SAR_UnknownErr;
SAF_KEY *hkey = (SAF_KEY *)hKeyHandle;
if (!hKeyHandle || !pucInData) {
SAFerr(SAF_F_SAF_MACUPDATE, ERR_R_PASSED_NULL_PARAMETER);
return SAR_IndataErr;
}
if (uiInDataLen <= 0 || uiInDataLen > INT_MAX) {
SAFerr(SAF_F_SAF_MACUPDATE, SAF_R_INVALID_INPUT_LENGTH);
return SAR_IndataLenErr;
}
if (!hkey->cmac_ctx) {
const EVP_CIPHER *cipher;
if (!(cipher = EVP_get_cipherbysgd(hkey->hSymmKeyObj->uiCryptoAlgID))) {
SAFerr(SAF_F_SAF_MACUPDATE, SAF_R_INVALID_KEY_HANDLE);
ret = SAR_IndataErr;
goto end;
}
if (!(hkey->cmac_ctx = CMAC_CTX_new())) {
SAFerr(SAF_F_SAF_MACUPDATE, ERR_R_MALLOC_FAILURE);
goto end;
}
if (!CMAC_Init(hkey->cmac_ctx, hkey->key, hkey->keylen, cipher,
hkey->hSymmKeyObj->app->engine)) {
SAFerr(SAF_F_SAF_MACUPDATE, SAF_R_CMAC_FAILURE);
goto end;
}
}
if (!CMAC_Update(hkey->cmac_ctx, pucInData, uiInDataLen)) {
SAFerr(SAF_F_SAF_MACUPDATE, SAF_R_CMAC_FAILURE);
return SAR_UnknownErr;
}
ret = SAR_OK;
end:
if (ret != SAR_OK && hkey->cmac_ctx) {
CMAC_CTX_free(hkey->cmac_ctx);
hkey->cmac_ctx = NULL;
}
return ret;
}
/* CMAC-AES256: generate hash of known digest value and compare to known
precomputed correct hash
*/
static int FIPS_cmac_aes256_test()
{
unsigned char 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,
};
unsigned char data[] = "Sample text";
unsigned char kaval[] =
{ 0xec,0xc2,0xcf,0x63, 0xc7,0xce,0xfc,0xa4,
0xb0,0x86,0x37,0x5f, 0x15,0x60,0xba,0x1f,
};
unsigned char *out = NULL;
size_t outlen;
CMAC_CTX *ctx = CMAC_CTX_new();
int r = 0;
ERR_clear_error();
if (!ctx)
goto end;
if (!CMAC_Init(ctx,key,sizeof(key),EVP_aes_256_cbc(),NULL))
goto end;
if (!CMAC_Update(ctx,data,sizeof(data)-1))
goto end;
/* This should return 1. If not, there's a programming error... */
if (!CMAC_Final(ctx, out, &outlen))
goto end;
out = OPENSSL_malloc(outlen);
if (!CMAC_Final(ctx, out, &outlen))
goto end;
#if 0
{
char *hexout = OPENSSL_malloc(outlen * 2 + 1);
bin2hex(out, outlen, hexout);
printf("CMAC-AES256: res = %s\n", hexout);
OPENSSL_free(hexout);
}
r = 1;
#else
if (!memcmp(out,kaval,outlen))
r = 1;
#endif
end:
CMAC_CTX_free(ctx);
if (out)
OPENSSL_free(out);
return r;
}
/* CMAC-AES192: generate hash of known digest value and compare to known
precomputed correct hash
*/
static int FIPS_cmac_aes192_test()
{
unsigned char 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,
};
unsigned char data[] = "Sample text";
unsigned char kaval[] =
{ 0xd6,0x99,0x19,0x25, 0xe5,0x1d,0x95,0x48,
0xb1,0x4a,0x0b,0xf2, 0xc6,0x3c,0x47,0x1f,
};
unsigned char *out = NULL;
size_t outlen;
CMAC_CTX *ctx = CMAC_CTX_new();
int r = 0;
ERR_clear_error();
if (!ctx)
goto end;
if (!CMAC_Init(ctx,key,sizeof(key),EVP_aes_192_cbc(),NULL))
goto end;
if (!CMAC_Update(ctx,data,sizeof(data)-1))
goto end;
/* This should return 1. If not, there's a programming error... */
if (!CMAC_Final(ctx, out, &outlen))
goto end;
out = OPENSSL_malloc(outlen);
if (!CMAC_Final(ctx, out, &outlen))
goto end;
#if 0
{
char *hexout = OPENSSL_malloc(outlen * 2 + 1);
bin2hex(out, outlen, hexout);
printf("CMAC-AES192: res = %s\n", hexout);
OPENSSL_free(hexout);
}
r = 1;
#else
if (!memcmp(out,kaval,outlen))
r = 1;
#endif
end:
CMAC_CTX_free(ctx);
if (out)
OPENSSL_free(out);
return r;
}
/* CMAC-AES128: generate hash of known digest value and compare to known
precomputed correct hash
*/
static int FIPS_cmac_aes128_test()
{
unsigned char key[16] = { 0x2b,0x7e,0x15,0x16, 0x28,0xae,0xd2,0xa6,
0xab,0xf7,0x15,0x88, 0x09,0xcf,0x4f,0x3c,
};
unsigned char data[] = "Sample text";
unsigned char kaval[EVP_MAX_MD_SIZE] =
{ 0x16,0x83,0xfe,0xac, 0x52,0x9b,0xae,0x23,
0xd7,0xd5,0x66,0xf5, 0xd2,0x8d,0xbd,0x2a,
};
unsigned char *out = NULL;
size_t outlen;
CMAC_CTX *ctx = CMAC_CTX_new();
int r = 0;
ERR_clear_error();
if (!ctx)
goto end;
if (!CMAC_Init(ctx,key,sizeof(key),EVP_aes_128_cbc(),NULL))
goto end;
if (!CMAC_Update(ctx,data,sizeof(data)-1))
goto end;
/* This should return 1. If not, there's a programming error... */
if (!CMAC_Final(ctx, out, &outlen))
goto end;
out = OPENSSL_malloc(outlen);
if (!CMAC_Final(ctx, out, &outlen))
goto end;
#if 0
{
char *hexout = OPENSSL_malloc(outlen * 2 + 1);
bin2hex(out, outlen, hexout);
printf("CMAC-AES128: res = %s\n", hexout);
OPENSSL_free(hexout);
}
r = 1;
#else
if (!memcmp(out,kaval,outlen))
r = 1;
#endif
end:
CMAC_CTX_free(ctx);
if (out)
OPENSSL_free(out);
return r;
}
/* CMAC-TDEA3: generate hash of known digest value and compare to known
precomputed correct hash
*/
static int FIPS_cmac_tdea3_test()
{
unsigned char key[] = { 0x8a,0xa8,0x3b,0xf8, 0xcb,0xda,0x10,0x62,
0x0b,0xc1,0xbf,0x19, 0xfb,0xb6,0xcd,0x58,
0xbc,0x31,0x3d,0x4a, 0x37,0x1c,0xa8,0xb5,
};
unsigned char data[] = "Sample text";
unsigned char kaval[EVP_MAX_MD_SIZE] =
{ 0xb4,0x06,0x4e,0xbf, 0x59,0x89,0xba,0x68, };
unsigned char *out = NULL;
size_t outlen;
CMAC_CTX *ctx = CMAC_CTX_new();
int r = 0;
ERR_clear_error();
if (!ctx)
goto end;
if (!CMAC_Init(ctx,key,sizeof(key),EVP_des_ede3_cbc(),NULL))
goto end;
if (!CMAC_Update(ctx,data,sizeof(data)-1))
goto end;
/* This should return 1. If not, there's a programming error... */
if (!CMAC_Final(ctx, out, &outlen))
goto end;
out = OPENSSL_malloc(outlen);
if (!CMAC_Final(ctx, out, &outlen))
goto end;
#if 0
{
char *hexout = OPENSSL_malloc(outlen * 2 + 1);
bin2hex(out, outlen, hexout);
printf("CMAC-TDEA3: res = %s\n", hexout);
OPENSSL_free(hexout);
}
r = 1;
#else
if (!memcmp(out,kaval,outlen))
r = 1;
#endif
end:
CMAC_CTX_free(ctx);
if (out)
OPENSSL_free(out);
return r;
}
int FIPS_selftest_cmac()
{
size_t n, outlen;
unsigned char out[32];
const EVP_CIPHER *cipher;
CMAC_CTX *ctx = CMAC_CTX_new();
const CMAC_KAT *t;
int rv = 1;
for (n = 0, t = vector; n < sizeof(vector) / sizeof(vector[0]); n++, t++) {
cipher = FIPS_get_cipherbynid(t->nid);
if (!cipher) {
rv = -1;
goto err;
}
if (!CMAC_Init(ctx, t->key, t->keysize / 8, cipher, 0)) {
rv = -1;
goto err;
}
if (!CMAC_Update(ctx, t->msg, t->msgsize / 8)) {
rv = -1;
goto err;
}
if (!CMAC_Final(ctx, out, &outlen)) {
rv = -1;
goto err;
}
CMAC_CTX_cleanup(ctx);
if (outlen < t->macsize / 8 || memcmp(out, t->mac, t->macsize / 8)) {
rv = 0;
}
}
err:
CMAC_CTX_free(ctx);
if (rv == -1) {
rv = 0;
}
if (!rv)
FIPSerr(FIPS_F_FIPS_SELFTEST_CMAC, FIPS_R_SELFTEST_FAILED);
return rv;
}
// We are doing CBC-MAC not CMAC at this time
bool AES_CMAC_Validate(COSE_MacMessage * pcose, int KeySize, int TagSize, const byte * pbAuthData, int cbAuthData, cose_errback * perr)
{
CMAC_CTX * pctx = NULL;
const EVP_CIPHER * pcipher = NULL;
byte * rgbOut = NULL;
size_t cbOut;
bool f = false;
unsigned int i;
#ifdef USE_CBOR_CONTEXT
cn_cbor_context * context = &pcose->m_message.m_allocContext;
#endif
pctx = CMAC_CTX_new();
switch (KeySize) {
case 128: pcipher = EVP_aes_128_cbc(); break;
case 256: pcipher = EVP_aes_256_cbc(); break;
default: FAIL_CONDITION(COSE_ERR_INVALID_PARAMETER); break;
}
rgbOut = COSE_CALLOC(128/8, 1, context);
CHECK_CONDITION(rgbOut != NULL, COSE_ERR_OUT_OF_MEMORY);
CHECK_CONDITION(CMAC_Init(pctx, pcose->pbKey, pcose->cbKey, pcipher, NULL /*impl*/) == 1, COSE_ERR_CRYPTO_FAIL);
CHECK_CONDITION(CMAC_Update(pctx, pbAuthData, cbAuthData), COSE_ERR_CRYPTO_FAIL);
CHECK_CONDITION(CMAC_Final(pctx, rgbOut, &cbOut), COSE_ERR_CRYPTO_FAIL);
cn_cbor * cn = _COSE_arrayget_int(&pcose->m_message, INDEX_MAC_TAG);
CHECK_CONDITION(cn != NULL, COSE_ERR_CBOR);
for (i = 0; i < (unsigned int)TagSize / 8; i++) f |= (cn->v.bytes[i] != rgbOut[i]);
COSE_FREE(rgbOut, context);
CMAC_CTX_cleanup(pctx);
CMAC_CTX_free(pctx);
return !f;
errorReturn:
COSE_FREE(rgbOut, context);
CMAC_CTX_cleanup(pctx);
CMAC_CTX_free(pctx);
return false;
}
/*
* Calculate per-link MAC by pathname
*/
static int32_t calc_link_mac_v1(struct mtd_format_v1 *fmt,
loc_t *loc,
unsigned char *result,
struct crypt_inode_info *info,
struct master_cipher_info *master)
{
int32_t ret;
unsigned char nmtd_link_key[16];
CMAC_CTX *cctx;
size_t len;
ret = get_nmtd_link_key(loc, master, nmtd_link_key);
if (ret) {
gf_log("crypt", GF_LOG_ERROR, "Can not get nmtd link key");
return -1;
}
cctx = CMAC_CTX_new();
if (!cctx) {
gf_log("crypt", GF_LOG_ERROR, "CMAC_CTX_new failed");
return -1;
}
ret = CMAC_Init(cctx, nmtd_link_key, sizeof(nmtd_link_key),
EVP_aes_128_cbc(), 0);
if (!ret) {
gf_log("crypt", GF_LOG_ERROR, "CMAC_Init failed");
CMAC_CTX_free(cctx);
return -1;
}
ret = CMAC_Update(cctx, get_NMTD_V1(info), SIZE_OF_NMTD_V1);
if (!ret) {
gf_log("crypt", GF_LOG_ERROR, "CMAC_Update failed");
CMAC_CTX_free(cctx);
return -1;
}
ret = CMAC_Final(cctx, result, &len);
CMAC_CTX_free(cctx);
if (!ret) {
gf_log("crypt", GF_LOG_ERROR, "CMAC_Final failed");
return -1;
}
return 0;
}
static int print_cmac_ver(const EVP_CIPHER *cipher, FILE *out,
unsigned char *Key, int Klen,
unsigned char *Msg, int Mlen,
unsigned char *Mac, int Maclen,
int Tlen)
{
int rc;
size_t reslen;
unsigned char res[128];
CMAC_CTX *cmac_ctx = CMAC_CTX_new();
CMAC_Init(cmac_ctx, Key, Klen, cipher, 0);
CMAC_Update(cmac_ctx, Msg, Mlen);
if (!CMAC_Final(cmac_ctx, res, &reslen))
{
fputs("Error calculating CMAC\n", stderr);
rc = 0;
}
else if (Tlen > (int)reslen)
{
fputs("Parameter error, Tlen > CMAC length\n", stderr);
rc = 0;
}
else if (Tlen != Maclen)
{
fputs("Parameter error, Tlen != resulting Mac length\n", stderr);
rc = 0;
}
else
{
if (!memcmp(Mac, res, Maclen))
fputs("Result = P\n", out);
else
fputs("Result = F\n", out);
}
CMAC_CTX_free(cmac_ctx);
return rc;
}
static
void
test_cmac (
const uint8_t * key,
unsigned key_length,
const uint8_t * message,
unsigned length,
const uint8_t * expect,
unsigned expected_length)
{
size_t size;
uint8_t result[16];
ctx = CMAC_CTX_new ();
CMAC_Init (ctx, key, key_length, EVP_aes_128_cbc (), NULL);
CMAC_Update (ctx, message, length);
CMAC_Final (ctx, result, &size);
CMAC_CTX_free (ctx);
if (compare_buffer (result, size, expect, expected_length) != 0) {
fail ("test_cmac");
}
}
int FIPS_selftest_cmac()
{
size_t n, outlen;
unsigned char out[32];
const EVP_CIPHER *cipher;
CMAC_CTX *ctx = CMAC_CTX_new();
const CMAC_KAT *t;
int subid = -1, rv = 1;
for(n=0,t=vector; n<sizeof(vector)/sizeof(vector[0]); n++,t++)
{
cipher = FIPS_get_cipherbynid(t->nid);
if (!cipher)
{
rv = -1;
goto err;
}
subid = M_EVP_CIPHER_nid(cipher);
if (!fips_post_started(FIPS_TEST_CMAC, subid, 0))
continue;
if (!CMAC_Init(ctx, t->key, t->keysize/8, cipher, 0))
{
rv = -1;
goto err;
}
if (!CMAC_Update(ctx, t->msg, t->msgsize/8))
{
rv = -1;
goto err;
}
if (!fips_post_corrupt(FIPS_TEST_CMAC, subid, NULL))
{
if (!CMAC_Update(ctx, t->msg, 1))
{
rv = -1;
goto err;
}
}
if (!CMAC_Final(ctx, out, &outlen))
{
rv = -1;
goto err;
}
CMAC_CTX_cleanup(ctx);
if(outlen < t->macsize/8 || memcmp(out,t->mac,t->macsize/8))
{
fips_post_failed(FIPS_TEST_CMAC, subid, NULL);
rv = 0;
}
else if (!fips_post_success(FIPS_TEST_CMAC, subid, NULL))
{
rv = 0;
goto err;
}
}
err:
CMAC_CTX_free(ctx);
if (rv == -1)
{
fips_post_failed(FIPS_TEST_CMAC, subid, NULL);
rv = 0;
}
if (!rv)
FIPSerr(FIPS_F_FIPS_SELFTEST_CMAC,FIPS_R_SELFTEST_FAILED);
return rv;
}
int OTP_generate(const OTP_PARAMS *params, const void *event, size_t eventlen,
unsigned int *otp, const unsigned char *key, size_t keylen)
{
int ret = 0;
time_t t = 0;
unsigned char *id = NULL;
size_t idlen;
const EVP_MD *md;
const EVP_CIPHER *cipher;
EVP_MD_CTX *mdctx = NULL;
CMAC_CTX *cmctx = NULL;
unsigned char s[EVP_MAX_MD_SIZE];
size_t slen;
uint32_t od;
int i, n;
OPENSSL_assert(sizeof(time_t) == 8);
if (!check_params(params)) {
OTPerr(OTP_F_OTP_GENERATE, OTP_R_INVALID_PARAMS);
return 0;
}
idlen = sizeof(uint64_t) + eventlen + params->option_size;
if (idlen < 16) {
idlen = 16;
}
if (!(id = OPENSSL_malloc(idlen))) {
OTPerr(OTP_F_OTP_GENERATE, ERR_R_MALLOC_FAILURE);
goto end;
}
memset(id, 0, idlen);
t = time(NULL) + params->offset;
t /= params->te;
memcpy(id, &t, sizeof(t));
memcpy(id + sizeof(t), event, eventlen);
memcpy(id + sizeof(t) + eventlen, params->option, params->option_size);
/* FIXME: try to get md and cipher, and check if cipher is ECB */
if (params->type == NID_sm3) {
md = EVP_get_digestbynid(params->type);
if (!(mdctx = EVP_MD_CTX_new())) {
OTPerr(OTP_F_OTP_GENERATE, ERR_R_MALLOC_FAILURE);
goto end;
}
if (!EVP_DigestInit_ex(mdctx, md, NULL)) {
OTPerr(OTP_F_OTP_GENERATE, ERR_R_EVP_LIB);
goto end;
}
if (!EVP_DigestUpdate(mdctx, key, keylen)) {
OTPerr(OTP_F_OTP_GENERATE, ERR_R_EVP_LIB);
goto end;
}
if (!EVP_DigestUpdate(mdctx, id, idlen)) {
OTPerr(OTP_F_OTP_GENERATE, ERR_R_EVP_LIB);
goto end;
}
if (!EVP_DigestFinal_ex(mdctx, s, (unsigned int *)&slen)) {
OTPerr(OTP_F_OTP_GENERATE, ERR_R_EVP_LIB);
goto end;
}
} else if (params->type == NID_sms4_ecb) {
cipher = EVP_get_cipherbynid(params->type);
if (!(cmctx = CMAC_CTX_new())) {
OTPerr(OTP_F_OTP_GENERATE, ERR_R_MALLOC_FAILURE);
goto end;
}
if (!CMAC_Init(cmctx, key, keylen, cipher, NULL)) {
OTPerr(OTP_F_OTP_GENERATE, OTP_R_CMAC_FAILURE);
goto end;
}
if (!CMAC_Update(cmctx, id, idlen)) {
OTPerr(OTP_F_OTP_GENERATE, OTP_R_CMAC_FAILURE);
goto end;
}
if (!CMAC_Final(cmctx, s, &slen)) {
OTPerr(OTP_F_OTP_GENERATE, OTP_R_CMAC_FAILURE);
goto end;
}
} else {
goto end;
}
OPENSSL_assert(slen % 4 == 0);
od = 0;
n = (int)slen;
for (i = 0; i < n/4; i++) {
od += GETU32(&s[i * 4]);
}
*otp = od % pow_table[params->otp_digits];
ret = 1;
end:
OPENSSL_free(id);
EVP_MD_CTX_free(mdctx);
CMAC_CTX_free(cmctx);
return ret;
}
/*!
@brief Create integrity cmac t for a given message.
@param[in] stream_cipher Structure containing various variables to setup encoding
@param[out] out For EIA2 the output string is 32 bits long
*/
int
nas_stream_encrypt_eia2 (
nas_stream_cipher_t * stream_cipher,
uint8_t out[4])
{
uint8_t *m = NULL;
uint32_t local_count;
size_t size = 4;
uint8_t data[16];
CMAC_CTX *cmac_ctx = NULL;
const EVP_CIPHER *cipher = EVP_aes_128_cbc ();
uint32_t zero_bit = 0;
uint32_t m_length;
int ret;
DevAssert (stream_cipher != NULL);
DevAssert (stream_cipher->key != NULL);
DevAssert (stream_cipher->key_length > 0);
DevAssert (out != NULL);
memset (data, 0, 16);
zero_bit = stream_cipher->blength & 0x7;
m_length = stream_cipher->blength >> 3;
if (zero_bit > 0)
m_length += 1;
local_count = hton_int32 (stream_cipher->count);
m = calloc (m_length + 8, sizeof (uint8_t));
memcpy (&m[0], &local_count, 4);
m[4] = ((stream_cipher->bearer & 0x1F) << 3) | ((stream_cipher->direction & 0x01) << 2);
memcpy (&m[8], stream_cipher->message, m_length);
#if SECU_DEBUG
{
int i;
printf ("Byte length: %u, Zero bits: %u\nm: ", m_length + 8, zero_bit);
for (i = 0; i < m_length + 8; i++)
printf ("%02x", m[i]);
printf ("\nKey:");
for (i = 0; i < stream_cipher->key_length; i++)
printf ("%02x", stream_cipher->key[i]);
printf ("\nMessage:");
for (i = 0; i < m_length; i++)
printf ("%02x", stream_cipher->message[i]);
printf ("\n");
}
#endif
cmac_ctx = CMAC_CTX_new ();
ret = CMAC_Init (cmac_ctx, stream_cipher->key, stream_cipher->key_length, cipher, NULL);
ret = CMAC_Update (cmac_ctx, m, m_length + 8);
CMAC_Final (cmac_ctx, data, &size);
CMAC_CTX_free (cmac_ctx);
#if SECU_DEBUG
{
int i;
printf ("out: ");
for (i = 0; i < size; i++)
printf ("%02x", data[i]);
printf ("\n");
}
#endif
memcpy (out, data, 4);
free (m);
return 0;
}