static int
hkdf_sha512_extract(uint8_t *salt, uint_t salt_len, uint8_t *key_material,
uint_t km_len, uint8_t *out_buf)
{
int ret;
crypto_mechanism_t mech;
crypto_key_t key;
crypto_data_t input_cd, output_cd;
/* initialize HMAC mechanism */
mech.cm_type = crypto_mech2id(SUN_CKM_SHA512_HMAC);
mech.cm_param = NULL;
mech.cm_param_len = 0;
/* initialize the salt as a crypto key */
key.ck_format = CRYPTO_KEY_RAW;
key.ck_length = CRYPTO_BYTES2BITS(salt_len);
key.ck_data = salt;
/* initialize crypto data for the input and output data */
input_cd.cd_format = CRYPTO_DATA_RAW;
input_cd.cd_offset = 0;
input_cd.cd_length = km_len;
input_cd.cd_raw.iov_base = (char *)key_material;
input_cd.cd_raw.iov_len = input_cd.cd_length;
output_cd.cd_format = CRYPTO_DATA_RAW;
output_cd.cd_offset = 0;
output_cd.cd_length = SHA512_DIGEST_LENGTH;
output_cd.cd_raw.iov_base = (char *)out_buf;
output_cd.cd_raw.iov_len = output_cd.cd_length;
ret = crypto_mac(&mech, &input_cd, &key, NULL, &output_cd, NULL);
if (ret != CRYPTO_SUCCESS)
return (SET_ERROR(EIO));
return (0);
}
static int
pbkdf2(uint8_t *passphrase, size_t passphraselen, uint8_t *salt,
size_t saltlen, uint64_t iterations, uint8_t *output,
size_t outputlen)
{
int ret;
uint64_t iter;
uint32_t blockptr, i;
uint16_t hmac_key_len;
uint8_t *hmac_key;
uint8_t block[SHA1_DIGEST_LEN * 2];
uint8_t *hmacresult = block + SHA1_DIGEST_LEN;
crypto_mechanism_t mech;
crypto_key_t key;
crypto_data_t in_data, out_data;
crypto_ctx_template_t tmpl = NULL;
/* initialize output */
memset(output, 0, outputlen);
/* initialize icp for use */
thread_init();
icp_init();
/* HMAC key size is max(sizeof(uint32_t) + salt len, sha 256 len) */
if (saltlen > SHA1_DIGEST_LEN) {
hmac_key_len = saltlen + sizeof (uint32_t);
} else {
hmac_key_len = SHA1_DIGEST_LEN;
}
hmac_key = calloc(hmac_key_len, 1);
if (!hmac_key) {
ret = ENOMEM;
goto error;
}
/* initialize sha 256 hmac mechanism */
mech.cm_type = crypto_mech2id(SUN_CKM_SHA1_HMAC);
mech.cm_param = NULL;
mech.cm_param_len = 0;
/* initialize passphrase as a crypto key */
key.ck_format = CRYPTO_KEY_RAW;
key.ck_length = CRYPTO_BYTES2BITS(passphraselen);
key.ck_data = passphrase;
/*
* initialize crypto data for the input data. length will change
* after the first iteration, so we will initialize it in the loop.
*/
in_data.cd_format = CRYPTO_DATA_RAW;
in_data.cd_offset = 0;
in_data.cd_raw.iov_base = (char *)hmac_key;
/* initialize crypto data for the output data */
out_data.cd_format = CRYPTO_DATA_RAW;
out_data.cd_offset = 0;
out_data.cd_length = SHA1_DIGEST_LEN;
out_data.cd_raw.iov_base = (char *)hmacresult;
out_data.cd_raw.iov_len = out_data.cd_length;
/* initialize the context template */
ret = crypto_create_ctx_template(&mech, &key, &tmpl, KM_SLEEP);
if (ret != CRYPTO_SUCCESS) {
ret = EIO;
goto error;
}
/* main loop */
for (blockptr = 0; blockptr < outputlen; blockptr += SHA1_DIGEST_LEN) {
/*
* for the first iteration, the HMAC key is the user-provided
* salt concatenated with the block index (1-indexed)
*/
i = htobe32(1 + (blockptr / SHA1_DIGEST_LEN));
memmove(hmac_key, salt, saltlen);
memmove(hmac_key + saltlen, (uint8_t *)(&i), sizeof (uint32_t));
/* block initializes to zeroes (no XOR) */
memset(block, 0, SHA1_DIGEST_LEN);
for (iter = 0; iter < iterations; iter++) {
if (iter > 0) {
in_data.cd_length = SHA1_DIGEST_LEN;
in_data.cd_raw.iov_len = in_data.cd_length;
} else {
in_data.cd_length = saltlen + sizeof (uint32_t);
in_data.cd_raw.iov_len = in_data.cd_length;
}
ret = crypto_mac(&mech, &in_data, &key, tmpl,
&out_data, NULL);
if (ret != CRYPTO_SUCCESS) {
ret = EIO;
goto error;
}
/* HMAC key now becomes the output of this iteration */
memmove(hmac_key, hmacresult, SHA1_DIGEST_LEN);
/* XOR this iteration's result with the current block */
for (i = 0; i < SHA1_DIGEST_LEN; i++) {
block[i] ^= hmacresult[i];
}
}
/*
* compute length of this block, make sure we don't write
* beyond the end of the output, truncating if necessary
*/
if (blockptr + SHA1_DIGEST_LEN > outputlen) {
memmove(output + blockptr, block, outputlen - blockptr);
} else {
memmove(output + blockptr, block, SHA1_DIGEST_LEN);
}
}
crypto_destroy_ctx_template(tmpl);
free(hmac_key);
icp_fini();
thread_fini();
return (0);
error:
crypto_destroy_ctx_template(tmpl);
if (hmac_key != NULL)
free(hmac_key);
icp_fini();
thread_fini();
return (ret);
}
static int
hkdf_sha512_expand(uint8_t *extract_key, uint8_t *info, uint_t info_len,
uint8_t *out_buf, uint_t out_len)
{
int ret;
crypto_mechanism_t mech;
crypto_context_t ctx;
crypto_key_t key;
crypto_data_t T_cd, info_cd, c_cd;
uint_t i, T_len = 0, pos = 0;
uint8_t c;
uint_t N = (out_len + SHA512_DIGEST_LENGTH) / SHA512_DIGEST_LENGTH;
uint8_t T[SHA512_DIGEST_LENGTH];
if (N > 255)
return (SET_ERROR(EINVAL));
/* initialize HMAC mechanism */
mech.cm_type = crypto_mech2id(SUN_CKM_SHA512_HMAC);
mech.cm_param = NULL;
mech.cm_param_len = 0;
/* initialize the salt as a crypto key */
key.ck_format = CRYPTO_KEY_RAW;
key.ck_length = CRYPTO_BYTES2BITS(SHA512_DIGEST_LENGTH);
key.ck_data = extract_key;
/* initialize crypto data for the input and output data */
T_cd.cd_format = CRYPTO_DATA_RAW;
T_cd.cd_offset = 0;
T_cd.cd_raw.iov_base = (char *)T;
c_cd.cd_format = CRYPTO_DATA_RAW;
c_cd.cd_offset = 0;
c_cd.cd_length = 1;
c_cd.cd_raw.iov_base = (char *)&c;
c_cd.cd_raw.iov_len = c_cd.cd_length;
info_cd.cd_format = CRYPTO_DATA_RAW;
info_cd.cd_offset = 0;
info_cd.cd_length = info_len;
info_cd.cd_raw.iov_base = (char *)info;
info_cd.cd_raw.iov_len = info_cd.cd_length;
for (i = 1; i <= N; i++) {
c = i;
T_cd.cd_length = T_len;
T_cd.cd_raw.iov_len = T_cd.cd_length;
ret = crypto_mac_init(&mech, &key, NULL, &ctx, NULL);
if (ret != CRYPTO_SUCCESS)
return (SET_ERROR(EIO));
ret = crypto_mac_update(ctx, &T_cd, NULL);
if (ret != CRYPTO_SUCCESS)
return (SET_ERROR(EIO));
ret = crypto_mac_update(ctx, &info_cd, NULL);
if (ret != CRYPTO_SUCCESS)
return (SET_ERROR(EIO));
ret = crypto_mac_update(ctx, &c_cd, NULL);
if (ret != CRYPTO_SUCCESS)
return (SET_ERROR(EIO));
T_len = SHA512_DIGEST_LENGTH;
T_cd.cd_length = T_len;
T_cd.cd_raw.iov_len = T_cd.cd_length;
ret = crypto_mac_final(ctx, &T_cd, NULL);
if (ret != CRYPTO_SUCCESS)
return (SET_ERROR(EIO));
bcopy(T, out_buf + pos,
(i != N) ? SHA512_DIGEST_LENGTH : (out_len - pos));
pos += SHA512_DIGEST_LENGTH;
}
return (0);
}
