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Fixed decrypt on esp32 without auth key

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This commit is contained in:
Gunnar Skjold 2022-03-26 09:31:49 +01:00
parent 3e937a4e5d
commit 6cdb943763
1 changed files with 22 additions and 7 deletions
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29
src/ams/hdlc.cpp
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@ -241,13 +241,28 @@ int HDLC_validate(const uint8_t* d, int length, HDLCConfig* config, CosemDateTim
if (0 != success) {
return HDLC_ENCRYPTION_KEY_FAILED;
}
success = mbedtls_gcm_auth_decrypt(&m_ctx, sizeof(cipher_text), config->initialization_vector, sizeof(config->initialization_vector),
config->additional_authenticated_data, aadlen, config->authentication_tag, authkeylen,
cipher_text, (unsigned char*)(ptr));
if (authkeylen > 0 && success == MBEDTLS_ERR_GCM_AUTH_FAILED) {
return HDLC_ENCRYPTION_AUTH_FAILED;
} else if(success == MBEDTLS_ERR_GCM_BAD_INPUT) {
return HDLC_ENCRYPTION_DECRYPT_FAILED;
if (0 < authkeylen) {
success = mbedtls_gcm_auth_decrypt(&m_ctx, sizeof(cipher_text), config->initialization_vector, sizeof(config->initialization_vector),
config->additional_authenticated_data, aadlen, config->authentication_tag, authkeylen,
cipher_text, (unsigned char*)(ptr));
if (authkeylen > 0 && success == MBEDTLS_ERR_GCM_AUTH_FAILED) {
mbedtls_gcm_free(&m_ctx);
return HDLC_ENCRYPTION_AUTH_FAILED;
} else if(success == MBEDTLS_ERR_GCM_BAD_INPUT) {
mbedtls_gcm_free(&m_ctx);
return HDLC_ENCRYPTION_DECRYPT_FAILED;
}
} else {
success = mbedtls_gcm_starts(&m_ctx, MBEDTLS_GCM_DECRYPT, config->initialization_vector, sizeof(config->initialization_vector),NULL, 0);
if (0 != success) {
mbedtls_gcm_free(&m_ctx);
return HDLC_ENCRYPTION_DECRYPT_FAILED;
}
success = mbedtls_gcm_update(&m_ctx, sizeof(cipher_text), cipher_text, (unsigned char*)(ptr));
if (0 != success) {
mbedtls_gcm_free(&m_ctx);
return HDLC_ENCRYPTION_DECRYPT_FAILED;
}
}
mbedtls_gcm_free(&m_ctx);
#endif