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mirror of https://github.com/profanity-im/profanity.git synced 2024-12-04 14:46:46 -05:00

Add crypto backend for signal-protocol

This commit is contained in:
Paul Fariello 2019-02-19 19:18:15 +01:40
parent 4a5b672f95
commit bfbc8edcad
6 changed files with 317 additions and 3 deletions

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@ -70,6 +70,7 @@ unittest_sources = \
src/otr/otr.h \
src/pgp/gpg.h \
src/omemo/omemo.h \
src/omemo/crypto.h \
src/command/cmd_defs.h src/command/cmd_defs.c \
src/command/cmd_funcs.h src/command/cmd_funcs.c \
src/command/cmd_ac.h src/command/cmd_ac.c \
@ -170,7 +171,7 @@ otr4_sources = \
src/otr/otrlib.h src/otr/otrlibv4.c src/otr/otr.h src/otr/otr.c
omemo_sources = \
src/omemo/omemo.h src/omemo/omemo.c
src/omemo/omemo.h src/omemo/omemo.c src/omemo/crypto.h src/omemo/crypto.c
if BUILD_PYTHON_API
core_sources += $(python_sources)

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@ -275,6 +275,14 @@ if test "x$enable_omemo" != xno; then
[AS_IF([test "x$enable_omemo" = xyes],
[AC_MSG_ERROR([libsignal-protocol-c is required for omemo support])],
[AC_MSG_NOTICE([libsignal-protocol-c not found, omemo support not enabled])])])
AC_CHECK_LIB([sodium], [sodium_init],
[AM_CONDITIONAL([BUILD_OMEMO], [true])
AC_DEFINE([HAVE_LIBSIGNAL_PROTOCOL], [1], [Have omemo]),
LIBS="-lsodium $LIBS"],
[AS_IF([test "x$enable_omemo" = xyes],
[AC_MSG_ERROR([libsodium is required for omemo support])],
[AC_MSG_NOTICE([libsodium not found, omemo support not enabled])])])
fi
AS_IF([test "x$with_themes" = xno],

136
src/omemo/crypto.c Normal file
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@ -0,0 +1,136 @@
#include <assert.h>
#include <signal/signal_protocol.h>
#include <signal/signal_protocol_types.h>
#include <sodium.h>
#include "omemo/crypto.h"
int
omemo_crypto_init(void)
{
if (sodium_init() < 0) {
return -1;
}
if (crypto_aead_aes256gcm_is_available() == 0) {
return -1;
}
return 0;
}
int
omemo_random_func(uint8_t *data, size_t len, void *user_data)
{
randombytes_buf(data, len);
return 0;
}
int
omemo_hmac_sha256_init_func(void **hmac_context, const uint8_t *key, size_t key_len, void *user_data)
{
*hmac_context = sodium_malloc(sizeof(crypto_auth_hmacsha256_state));
return crypto_auth_hmacsha256_init(*hmac_context, key, key_len);
}
int
omemo_hmac_sha256_update_func(void *hmac_context, const uint8_t *data, size_t data_len, void *user_data)
{
return crypto_auth_hmacsha256_update(hmac_context, data, data_len);
}
int
omemo_hmac_sha256_final_func(void *hmac_context, signal_buffer **output, void *user_data)
{
int ret;
unsigned char out[crypto_auth_hmacsha256_BYTES];
if ((ret = crypto_auth_hmacsha256_final(hmac_context, out)) != 0) {
return ret;
}
*output = signal_buffer_create(out, crypto_auth_hmacsha256_BYTES);
return 0;
}
void
omemo_hmac_sha256_cleanup_func(void *hmac_context, void *user_data)
{
sodium_free(hmac_context);
}
int
omemo_sha512_digest_init_func(void **digest_context, void *user_data)
{
*digest_context = sodium_malloc(sizeof(crypto_hash_sha512_state));
return crypto_hash_sha512_init(*digest_context);
}
int
omemo_sha512_digest_update_func(void *digest_context, const uint8_t *data, size_t data_len, void *user_data)
{
return crypto_hash_sha512_update(digest_context, data, data_len);
}
int
omemo_sha512_digest_final_func(void *digest_context, signal_buffer **output, void *user_data)
{
int ret;
unsigned char out[crypto_hash_sha512_BYTES];
if ((ret = crypto_hash_sha512_final(digest_context, out)) != 0) {
return ret;
}
*output = signal_buffer_create(out, crypto_hash_sha512_BYTES);
return 0;
}
void
omemo_sha512_digest_cleanup_func(void *digest_context, void *user_data)
{
sodium_free(digest_context);
}
int
omemo_encrypt_func(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)
{
unsigned char *ciphertext;
unsigned long long ciphertext_len;
assert(cipher != SG_CIPHER_AES_GCM_NOPADDING);
assert(key_len == crypto_aead_aes256gcm_KEYBYTES);
assert(iv_len == crypto_aead_aes256gcm_NPUBBYTES);
ciphertext = malloc(plaintext_len + crypto_aead_aes256gcm_ABYTES);
crypto_aead_aes256gcm_encrypt(ciphertext, &ciphertext_len, plaintext, plaintext_len, NULL, 0, NULL, iv, key);
*output = signal_buffer_create(ciphertext, ciphertext_len);
free(ciphertext);
return 0;
}
int
omemo_decrypt_func(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)
{
unsigned char *plaintext;
unsigned long long plaintext_len;
assert(cipher != SG_CIPHER_AES_GCM_NOPADDING);
assert(key_len == crypto_aead_aes256gcm_KEYBYTES);
assert(iv_len == crypto_aead_aes256gcm_NPUBBYTES);
plaintext = malloc(ciphertext_len - crypto_aead_aes256gcm_ABYTES);
if (crypto_aead_aes256gcm_decrypt(plaintext, &plaintext_len, NULL, ciphertext, ciphertext_len, NULL, 0, iv, key) < 0) {
free(plaintext);
return -1;
}
*output = signal_buffer_create(plaintext, plaintext_len);
free(plaintext);
return 0;
}

136
src/omemo/crypto.h Normal file
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@ -0,0 +1,136 @@
#include <signal/signal_protocol_types.h>
#define SG_CIPHER_AES_GCM_NOPADDING 1000
int omemo_crypto_init(void);
/**
* Callback for a secure random number generator.
* This function shall fill the provided buffer with random bytes.
*
* @param data pointer to the output buffer
* @param len size of the output buffer
* @return 0 on success, negative on failure
*/
int omemo_random_func(uint8_t *data, size_t len, void *user_data);
/**
* Callback for an HMAC-SHA256 implementation.
* This function shall initialize an HMAC context with the provided key.
*
* @param hmac_context private HMAC context pointer
* @param key pointer to the key
* @param key_len length of the key
* @return 0 on success, negative on failure
*/
int omemo_hmac_sha256_init_func(void **hmac_context, const uint8_t *key, size_t key_len, void *user_data);
/**
* Callback for an HMAC-SHA256 implementation.
* This function shall update the HMAC context with the provided data
*
* @param hmac_context private HMAC context pointer
* @param data pointer to the data
* @param data_len length of the data
* @return 0 on success, negative on failure
*/
int omemo_hmac_sha256_update_func(void *hmac_context, const uint8_t *data, size_t data_len, void *user_data);
/**
* Callback for an HMAC-SHA256 implementation.
* This function shall finalize an HMAC calculation and populate the output
* buffer with the result.
*
* @param hmac_context private HMAC context pointer
* @param output buffer to be allocated and populated with the result
* @return 0 on success, negative on failure
*/
int omemo_hmac_sha256_final_func(void *hmac_context, signal_buffer **output, void *user_data);
/**
* Callback for an HMAC-SHA256 implementation.
* This function shall free the private context allocated in
* hmac_sha256_init_func.
*
* @param hmac_context private HMAC context pointer
*/
void omemo_hmac_sha256_cleanup_func(void *hmac_context, void *user_data);
/**
* Callback for a SHA512 message digest implementation.
* This function shall initialize a digest context.
*
* @param digest_context private digest context pointer
* @return 0 on success, negative on failure
*/
int omemo_sha512_digest_init_func(void **digest_context, void *user_data);
/**
* Callback for a SHA512 message digest implementation.
* This function shall update the digest context with the provided data.
*
* @param digest_context private digest context pointer
* @param data pointer to the data
* @param data_len length of the data
* @return 0 on success, negative on failure
*/
int omemo_sha512_digest_update_func(void *digest_context, const uint8_t *data, size_t data_len, void *user_data);
/**
* Callback for a SHA512 message digest implementation.
* This function shall finalize the digest calculation, populate the
* output buffer with the result, and prepare the context for reuse.
*
* @param digest_context private digest context pointer
* @param output buffer to be allocated and populated with the result
* @return 0 on success, negative on failure
*/
int omemo_sha512_digest_final_func(void *digest_context, signal_buffer **output, void *user_data);
/**
* Callback for a SHA512 message digest implementation.
* This function shall free the private context allocated in
* sha512_digest_init_func.
*
* @param digest_context private digest context pointer
*/
void omemo_sha512_digest_cleanup_func(void *digest_context, void *user_data);
/**
* Callback for an AES encryption implementation.
*
* @param output buffer to be allocated and populated with the ciphertext
* @param cipher specific cipher variant to use, either SG_CIPHER_AES_CTR_NOPADDING or SG_CIPHER_AES_CBC_PKCS5
* @param key the encryption key
* @param key_len length of the encryption key
* @param iv the initialization vector
* @param iv_len length of the initialization vector
* @param plaintext the plaintext to encrypt
* @param plaintext_len length of the plaintext
* @return 0 on success, negative on failure
*/
int omemo_encrypt_func(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);
/**
* Callback for an AES decryption implementation.
*
* @param output buffer to be allocated and populated with the plaintext
* @param cipher specific cipher variant to use, either SG_CIPHER_AES_CTR_NOPADDING or SG_CIPHER_AES_CBC_PKCS5
* @param key the encryption key
* @param key_len length of the encryption key
* @param iv the initialization vector
* @param iv_len length of the initialization vector
* @param ciphertext the ciphertext to decrypt
* @param ciphertext_len length of the ciphertext
* @return 0 on success, negative on failure
*/
int omemo_decrypt_func(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);

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@ -1,10 +1,40 @@
#include <signal/signal_protocol.h>
#include "config/account.h"
#include "ui/ui.h"
#include "omemo/crypto.h"
void
omemo_init(ProfAccount *account)
{
signal_context *global_context;
signal_context_create(&global_context, NULL);
signal_crypto_provider crypto_provider = {
.random_func = omemo_random_func,
.hmac_sha256_init_func = omemo_hmac_sha256_init_func,
.hmac_sha256_update_func = omemo_hmac_sha256_update_func,
.hmac_sha256_final_func = omemo_hmac_sha256_final_func,
.hmac_sha256_cleanup_func = omemo_hmac_sha256_cleanup_func,
.sha512_digest_init_func = omemo_sha512_digest_init_func,
.sha512_digest_update_func = omemo_sha512_digest_update_func,
.sha512_digest_final_func = omemo_sha512_digest_final_func,
.sha512_digest_cleanup_func = omemo_sha512_digest_cleanup_func,
.encrypt_func = omemo_encrypt_func,
.decrypt_func = omemo_decrypt_func,
.user_data = NULL
};
if (omemo_crypto_init() != 0) {
cons_show("Error initializing Omemo crypto");
}
if (signal_context_create(&global_context, NULL) != 0) {
cons_show("Error initializing Omemo context");
return;
}
if (signal_context_set_crypto_provider(global_context, &crypto_provider) != 0) {
cons_show("Error initializing Omemo crypto");
return;
}
//signal_context_set_locking_functions(global_context, lock_function, unlock_function);
}

3
src/omemo/omemo.h Normal file
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@ -0,0 +1,3 @@
#include "config/account.h"
void omemo_init(ProfAccount *account);