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#include <signal_helper.h>
#include <signal_protocol_internal.h>
#include <gcrypt.h>
signal_protocol_address* signal_protocol_address_new() {
signal_protocol_address* address = malloc(sizeof(signal_protocol_address));
address->name = 0;
address->device_id = 0;
return address;
}
void signal_protocol_address_free(signal_protocol_address* ptr) {
if (ptr->name) {
g_free((void*)ptr->name);
}
return free(ptr);
}
void signal_protocol_address_set_name(signal_protocol_address* self, const gchar* name) {
gchar* n = g_malloc(strlen(name)+1);
memcpy(n, name, strlen(name));
n[strlen(name)] = 0;
if (self->name) {
g_free((void*)self->name);
}
self->name = n;
self->name_len = strlen(n);
}
gchar* signal_protocol_address_get_name(signal_protocol_address* self) {
if (self->name == 0) return 0;
gchar* res = g_malloc(sizeof(char) * (self->name_len + 1));
memcpy(res, self->name, self->name_len);
res[self->name_len] = 0;
return res;
}
session_pre_key* session_pre_key_new(uint32_t pre_key_id, ec_key_pair* pair, int* err) {
session_pre_key* res;
*err = session_pre_key_create(&res, pre_key_id, pair);
return res;
}
session_signed_pre_key* session_signed_pre_key_new(uint32_t id, uint64_t timestamp, ec_key_pair* pair, uint8_t* key, int key_len, int* err) {
session_signed_pre_key* res;
*err = session_signed_pre_key_create(&res, id, timestamp, pair, key, key_len);
return res;
}
int signal_vala_random_generator(uint8_t *data, size_t len, void *user_data) {
gcry_randomize(data, len, GCRY_STRONG_RANDOM);
return SG_SUCCESS;
}
int signal_vala_hmac_sha256_init(void **hmac_context, const uint8_t *key, size_t key_len, void *user_data) {
gcry_mac_hd_t* ctx = malloc(sizeof(gcry_mac_hd_t));
if (!ctx) return SG_ERR_NOMEM;
if (gcry_mac_open(ctx, GCRY_MAC_HMAC_SHA256, 0, 0)) {
free(ctx);
return SG_ERR_UNKNOWN;
}
if (gcry_mac_setkey(*ctx, key, key_len)) {
free(ctx);
return SG_ERR_UNKNOWN;
}
*hmac_context = ctx;
return SG_SUCCESS;
}
int signal_vala_hmac_sha256_update(void *hmac_context, const uint8_t *data, size_t data_len, void *user_data) {
gcry_mac_hd_t* *ctx = hmac_context;
if (gcry_mac_write(*ctx, data, data_len)) return SG_ERR_UNKNOWN;
return SG_SUCCESS;
}
int signal_vala_hmac_sha256_final(void *hmac_context, signal_buffer **output, void *user_data) {
unsigned int len = gcry_mac_get_algo_maclen(GCRY_MAC_HMAC_SHA256);
unsigned char md[len];
gcry_mac_hd_t* ctx = hmac_context;
if (gcry_mac_read(*ctx, md, &len)) return SG_ERR_UNKNOWN;
signal_buffer *output_buffer = signal_buffer_create(md, len);
if (!output_buffer) return SG_ERR_NOMEM;
*output = output_buffer;
return SG_SUCCESS;
}
void signal_vala_hmac_sha256_cleanup(void *hmac_context, void *user_data) {
gcry_mac_hd_t* ctx = hmac_context;
if (ctx) {
gcry_mac_close(*ctx);
free(ctx);
}
}
int signal_vala_sha512_digest_init(void **digest_context, void *user_data) {
gcry_md_hd_t* ctx = malloc(sizeof(gcry_mac_hd_t));
if (!ctx) return SG_ERR_NOMEM;
if (gcry_md_open(ctx, GCRY_MD_SHA512, 0)) {
free(ctx);
return SG_ERR_UNKNOWN;
}
*digest_context = ctx;
return SG_SUCCESS;
}
int signal_vala_sha512_digest_update(void *digest_context, const uint8_t *data, size_t data_len, void *user_data) {
gcry_md_hd_t* ctx = digest_context;
gcry_md_write(*ctx, data, data_len);
return SG_SUCCESS;
}
int signal_vala_sha512_digest_final(void *digest_context, signal_buffer **output, void *user_data) {
unsigned int len = gcry_md_get_algo_dlen(GCRY_MD_SHA512);
gcry_md_hd_t* ctx = digest_context;
unsigned char* md = gcry_md_read(*ctx, GCRY_MD_SHA512);
if (!md) return SG_ERR_UNKNOWN;
gcry_md_reset(*ctx);
signal_buffer *output_buffer = signal_buffer_create(md, len);
if (!output_buffer) return SG_ERR_NOMEM;
*output = output_buffer;
return SG_SUCCESS;
}
void signal_vala_sha512_digest_cleanup(void *digest_context, void *user_data) {
gcry_md_hd_t* ctx = digest_context;
if (ctx) {
gcry_md_close(*ctx);
free(ctx);
}
}
const int aes_cipher(int cipher, size_t key_len, int* algo, int* mode) {
switch (key_len) {
case 16:
*algo = GCRY_CIPHER_AES128;
break;
case 24:
*algo = GCRY_CIPHER_AES192;
break;
case 32:
*algo = GCRY_CIPHER_AES256;
break;
default:
return SG_ERR_UNKNOWN;
}
switch (cipher) {
case SG_CIPHER_AES_CBC_PKCS5:
*mode = GCRY_CIPHER_MODE_CBC;
break;
case SG_CIPHER_AES_CTR_NOPADDING:
*mode = GCRY_CIPHER_MODE_CTR;
break;
case SG_CIPHER_AES_GCM_NOPADDING:
*mode = GCRY_CIPHER_MODE_GCM;
break;
default:
return SG_ERR_UNKNOWN;
}
return SG_SUCCESS;
}
int signal_vala_encrypt(signal_buffer **output,
int cipher,
const uint8_t *key, size_t key_len,
const uint8_t *iv, size_t iv_len,
const uint8_t *plaintext, size_t plaintext_len,
void *user_data) {
int algo, mode;
if (aes_cipher(cipher, key_len, &algo, &mode)) return SG_ERR_UNKNOWN;
if (iv_len != 16) return SG_ERR_UNKNOWN;
gcry_cipher_hd_t ctx = {0};
if (gcry_cipher_open(&ctx, algo, mode, 0)) return SG_ERR_UNKNOWN;
goto no_error;
error:
gcry_cipher_close(ctx);
return SG_ERR_UNKNOWN;
no_error:
if (gcry_cipher_setkey(ctx, key, key_len)) goto error;
uint8_t tag_len = 0, pad_len = 0;
switch (cipher) {
case SG_CIPHER_AES_CBC_PKCS5:
if (gcry_cipher_setiv(ctx, iv, iv_len)) goto error;
pad_len = 16 - (plaintext_len % 16);
if (pad_len == 0) pad_len = 16;
break;
case SG_CIPHER_AES_CTR_NOPADDING:
if (gcry_cipher_setctr(ctx, iv, iv_len)) goto error;
break;
case SG_CIPHER_AES_GCM_NOPADDING:
if (gcry_cipher_setiv(ctx, iv, iv_len)) goto error;
tag_len = 16;
break;
default:
return SG_ERR_UNKNOWN;
}
size_t padded_len = plaintext_len + pad_len;
uint8_t padded[padded_len];
memset(padded + plaintext_len, pad_len, pad_len);
memcpy(padded, plaintext, plaintext_len);
uint8_t out_buf[padded_len + tag_len];
if (gcry_cipher_encrypt(ctx, out_buf, padded_len, padded, padded_len)) goto error;
if (tag_len > 0) {
if (gcry_cipher_gettag(ctx, out_buf + padded_len, tag_len)) goto error;
}
*output = signal_buffer_create(out_buf, padded_len + tag_len);
gcry_cipher_close(ctx);
return SG_SUCCESS;
}
int signal_vala_decrypt(signal_buffer **output,
int cipher,
const uint8_t *key, size_t key_len,
const uint8_t *iv, size_t iv_len,
const uint8_t *ciphertext, size_t ciphertext_len,
void *user_data) {
int algo, mode;
if (aes_cipher(cipher, key_len, &algo, &mode)) return SG_ERR_UNKNOWN;
if (iv_len != 16) return SG_ERR_UNKNOWN;
gcry_cipher_hd_t ctx = {0};
if (gcry_cipher_open(&ctx, algo, mode, 0)) return SG_ERR_UNKNOWN;
goto no_error;
error:
gcry_cipher_close(ctx);
return SG_ERR_UNKNOWN;
no_error:
if (gcry_cipher_setkey(ctx, key, key_len)) goto error;
uint8_t tag_len = 0, pkcs_pad = FALSE;
switch (cipher) {
case SG_CIPHER_AES_CBC_PKCS5:
if (gcry_cipher_setiv(ctx, iv, iv_len)) goto error;
pkcs_pad = TRUE;
break;
case SG_CIPHER_AES_CTR_NOPADDING:
if (gcry_cipher_setctr(ctx, iv, iv_len)) goto error;
break;
case SG_CIPHER_AES_GCM_NOPADDING:
if (gcry_cipher_setiv(ctx, iv, iv_len)) goto error;
if (ciphertext_len < 16) goto error;
tag_len = 16;
break;
default:
return SG_ERR_UNKNOWN;
}
size_t padded_len = ciphertext_len - tag_len;
uint8_t out_buf[padded_len];
if (gcry_cipher_decrypt(ctx, out_buf, padded_len, ciphertext, padded_len)) goto error;
if (tag_len > 0) {
if (gcry_cipher_checktag(ctx, ciphertext + padded_len, tag_len)) goto error;
}
if (pkcs_pad) {
uint8_t pad_len = out_buf[padded_len - 1];
if (pad_len > 16) goto error;
*output = signal_buffer_create(out_buf, padded_len - pad_len);
} else {
*output = signal_buffer_create(out_buf, padded_len);
}
gcry_cipher_close(ctx);
return SG_SUCCESS;
}
void setup_signal_vala_crypto_provider(signal_context *context)
{
signal_crypto_provider provider = {
.random_func = signal_vala_random_generator,
.hmac_sha256_init_func = signal_vala_hmac_sha256_init,
.hmac_sha256_update_func = signal_vala_hmac_sha256_update,
.hmac_sha256_final_func = signal_vala_hmac_sha256_final,
.hmac_sha256_cleanup_func = signal_vala_hmac_sha256_cleanup,
.sha512_digest_init_func = signal_vala_sha512_digest_init,
.sha512_digest_update_func = signal_vala_sha512_digest_update,
.sha512_digest_final_func = signal_vala_sha512_digest_final,
.sha512_digest_cleanup_func = signal_vala_sha512_digest_cleanup,
.encrypt_func = signal_vala_encrypt,
.decrypt_func = signal_vala_decrypt,
.user_data = 0
};
signal_context_set_crypto_provider(context, &provider);
}
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