mirror of https://git.matrix.org/git/olm.git
initial implementation of short authentication string generation
Hubert Chathi
GitHub
parent
ec2695b9c9
commit
94f664e725
3
Makefile
3
Makefile
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@ -34,7 +34,7 @@ JS_EXPORTED_FUNCTIONS := javascript/exported_functions.json
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JS_EXTRA_EXPORTED_RUNTIME_METHODS := ALLOC_STACK
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JS_EXTERNS := javascript/externs.js
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PUBLIC_HEADERS := include/olm/olm.h include/olm/outbound_group_session.h include/olm/inbound_group_session.h include/olm/pk.h
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PUBLIC_HEADERS := include/olm/olm.h include/olm/outbound_group_session.h include/olm/inbound_group_session.h include/olm/pk.h include/olm/sas.h
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SOURCES := $(wildcard src/*.cpp) $(wildcard src/*.c) \
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lib/crypto-algorithms/sha256.c \
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@ -60,6 +60,7 @@ JS_PRE := $(wildcard javascript/*pre.js)
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JS_POST := javascript/olm_outbound_group_session.js \
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javascript/olm_inbound_group_session.js \
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javascript/olm_pk.js \
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javascript/olm_sas.js \
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javascript/olm_post.js
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# The prefix & suffix are just added onto the start & end
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@ -0,0 +1,156 @@
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/* Copyright 2018-2019 New Vector Ltd
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef OLM_SAS_H_
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#define OLM_SAS_H_
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#include <stddef.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** @defgroup SAS Short Authentication String verification
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* These functions are used for verifying keys using the Short Authentication
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* String (SAS) method.
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* @{
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*/
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typedef struct OlmSAS OlmSAS;
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/** A null terminated string describing the most recent error to happen to an
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* SAS object. */
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const char * olm_sas_last_error(
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OlmSAS * sas
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);
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/** The size of an SAS object in bytes. */
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size_t olm_sas_size(void);
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/** Initialize an SAS object using the supplied memory.
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* The supplied memory must be at least `olm_sas_size()` bytes. */
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OlmSAS * olm_sas(
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void * memory
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);
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/** Clears the memory used to back an SAS object. */
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size_t olm_clear_sas(
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OlmSAS * sas
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);
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/** The number of random bytes needed to create an SAS object. */
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size_t olm_create_sas_random_length(
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OlmSAS * sas
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);
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/** Creates a new SAS object.
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*
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* @param[in] sas the SAS object to create, initialized by `olm_sas()`.
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* @param[in] random array of random bytes.
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* @param[in] random_length the number of random bytes provided. Must be at
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* least `olm_create_sas_random_length()`.
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*
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* @return `olm_error()` on failure. If there weren't enough random bytes then
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* `olm_sas_last_error()` will be `NOT_ENOUGH_RANDOM`.
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*/
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size_t olm_create_sas(
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OlmSAS * sas,
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void * random, size_t random_length
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);
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/** The size of a public key in bytes. */
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size_t olm_sas_pubkey_length(OlmSAS * sas);
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/** Get the public key for the SAS object.
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*
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* @param[in] sas the SAS object.
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* @param[out] pubkey buffer to store the public key.
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* @param[in] pubkey_length the size of the `pubkey` buffer. Must be at least
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* `olm_sas_pubkey_length()`.
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*
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* @return `olm_error()` on failure. If the `pubkey` buffer is too small, then
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* `olm_sas_last_error()` will be `OUTPUT_BUFFER_TOO_SMALL`.
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*/
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size_t olm_sas_get_pubkey(
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OlmSAS * sas,
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void * pubkey, size_t pubkey_length
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);
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/** Sets the public key of other user.
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*
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* @param[in] sas the SAS object.
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* @param[in] their_key the other user's public key.
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* @param[in] their_key_size the size of the `their_key` buffer.
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*
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* @return `olm_error()` on failure. If the `their_key` buffer is too small,
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* then `olm_sas_last_error()` will be `INPUT_BUFFER_TOO_SMALL`.
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*/
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size_t olm_sas_set_their_key(
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OlmSAS *sas,
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void * their_key, size_t their_key_length
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);
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/** Generate bytes to use for the short authentication string.
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*
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* @param[in] sas the SAS object.
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* @param[in] info extra information to mix in when generating the bytes, as
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* per the Matrix spec.
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* @param[in] info_length the length of the `info` parameter.
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* @param[out] output the output buffer.
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* @param[in] output_length the size of the output buffer. For hex-based SAS
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* as in the Matrix spec, this will be 5.
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*/
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size_t olm_sas_generate_bytes(
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OlmSAS * sas,
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const void * info, size_t info_length,
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void * output, size_t output_length
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);
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/** The size of the message authentication code generated by
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* olm_sas_calculate_mac()`. */
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size_t olm_sas_mac_length(
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OlmSAS *sas
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);
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/** Generate a message authentication code (MAC) based on the shared secret.
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*
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* @param[in] sas the SAS object.
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* @param[in] input the message to produce the authentication code for.
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* @param[in] input_length the length of the message.
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* @param[in] info extra information to mix in when generating the MAC, as per
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* the Matrix spec.
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* @param[in] info_length the length of the `info` parameter.
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* @param[out] mac the buffer in which to store the MAC.
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* @param[in] mac_length the size of the `mac` buffer. Must be at least
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* `olm_sas_mac_length()`
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*
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* @return `olm_error()` on failure. If the `mac` buffer is too small, then
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* `olm_sas_last_error()` will be `OUTPUT_BUFFER_TOO_SMALL`.
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*/
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size_t olm_sas_calculate_mac(
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OlmSAS * sas,
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void * input, size_t input_length,
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const void * info, size_t info_length,
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void * mac, size_t mac_length
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);
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/** @} */ // end of SAS group
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif /* OLM_SAS_H_ */
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@ -534,6 +534,7 @@ olm_exports["Session"] = Session;
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olm_exports["Utility"] = Utility;
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olm_exports["PkEncryption"] = PkEncryption;
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olm_exports["PkDecryption"] = PkDecryption;
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olm_exports["SAS"] = SAS;
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olm_exports["get_library_version"] = restore_stack(function() {
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var buf = stack(3);
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@ -0,0 +1,77 @@
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function SAS() {
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var size = Module['_olm_sas_size']();
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var random_length = Module['_olm_create_sas_random_length']();
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var random = random_stack(random_length);
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this.buf = malloc(size);
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this.ptr = Module['_olm_sas'](this.buf);
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Module['_olm_create_sas'](this.ptr, random, random_length);
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bzero(random, random_length);
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}
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function sas_method(wrapped) {
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return function() {
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var result = wrapped.apply(this, arguments);
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if (result === OLM_ERROR) {
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var message = Pointer_stringify(
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Module['_olm_sas_last_error'](arguments[0])
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);
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throw new Error("OLM." + message);
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}
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return result;
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}
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}
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SAS.prototype['free'] = function() {
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Module['_olm_clear_sas'](this.ptr);
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free(this.ptr);
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};
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SAS.prototype['get_pubkey'] = restore_stack(function() {
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var pubkey_length = sas_method(Module['_olm_sas_pubkey_length'])(this.ptr);
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var pubkey_buffer = stack(pubkey_length + NULL_BYTE_PADDING_LENGTH);
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sas_method(Module['_olm_sas_get_pubkey'])(this.ptr, pubkey_buffer, pubkey_length);
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return Pointer_stringify(pubkey_buffer);
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});
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SAS.prototype['set_their_key'] = restore_stack(function(their_key) {
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var their_key_array = array_from_string(their_key);
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var their_key_buffer = stack(their_key_array);
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sas_method(Module['_olm_sas_set_their_key'])(
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this.ptr,
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their_key_buffer, their_key_array.length
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);
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});
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SAS.prototype['generate_bytes'] = restore_stack(function(info, length) {
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var info_array = array_from_string(info);
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var info_buffer = stack(info_array);
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var output_buffer = stack(length);
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sas_method(Module['_olm_sas_generate_bytes'])(
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this.ptr,
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info_buffer, info_array.length,
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output_buffer, length
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);
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// The inner Uint8Array creates a view of the buffer. The outer Uint8Array
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// copies it to a new array to return, since the original buffer will get
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// deallocated from the stack and could get overwritten.
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var output_arr = new Uint8Array(
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new Uint8Array(Module['HEAPU8'].buffer, output_buffer, length)
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);
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return output_arr;
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});
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SAS.prototype['calculate_mac'] = restore_stack(function(input, info) {
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var input_array = array_from_string(input);
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var input_buffer = stack(input_array);
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var info_array = array_from_string(info);
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var info_buffer = stack(info_array);
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var mac_length = sas_method(Module['_olm_sas_mac_length'])(this.ptr);
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var mac_buffer = stack(mac_length + NULL_BYTE_PADDING_LENGTH);
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sas_method(Module['_olm_sas_calculate_mac'])(
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this.ptr,
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input_buffer, input_array.length,
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info_buffer, info_array.length,
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mac_buffer, mac_length
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);
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return Pointer_stringify(mac_buffer);
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});
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@ -0,0 +1,53 @@
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/*
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Copyright 2018 New Vector Ltd
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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var Olm = require('../olm');
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describe("sas", function() {
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var alice, bob;
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beforeEach(async function(done) {
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Olm.init().then(function() {
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alice = new Olm.SAS();
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bob = new Olm.SAS();
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done();
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});
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});
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afterEach(function () {
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if (alice !== undefined) {
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alice.free();
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alice = undefined;
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}
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if (bob !== undefined) {
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bob.free();
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bob = undefined;
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}
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});
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it('should create matching SAS bytes', function () {
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alice.set_their_key(bob.get_pubkey());
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bob.set_their_key(alice.get_pubkey());
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expect(alice.generate_bytes("SAS", 5).toString()).toEqual(bob.generate_bytes("SAS", 5).toString());
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});
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it('should create matching MACs', function () {
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alice.set_their_key(bob.get_pubkey());
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bob.set_their_key(alice.get_pubkey());
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expect(alice.calculate_mac("test", "MAC").toString()).toEqual(bob.calculate_mac("test", "MAC").toString());
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});
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});
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@ -0,0 +1,141 @@
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/* Copyright 2018-2019 New Vector Ltd
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "olm/sas.h"
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#include "olm/base64.h"
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#include "olm/crypto.h"
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#include "olm/error.h"
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#include "olm/memory.h"
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struct OlmSAS {
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enum OlmErrorCode last_error;
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struct _olm_curve25519_key_pair curve25519_key;
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uint8_t secret[CURVE25519_SHARED_SECRET_LENGTH];
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};
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const char * olm_sas_last_error(
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OlmSAS * sas
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) {
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return _olm_error_to_string(sas->last_error);
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}
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size_t olm_sas_size(void) {
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return sizeof(OlmSAS);
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}
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OlmSAS * olm_sas(
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void * memory
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) {
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_olm_unset(memory, sizeof(OlmSAS));
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return (OlmSAS *) memory;
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}
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size_t olm_clear_sas(
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OlmSAS * sas
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) {
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_olm_unset(sas, sizeof(OlmSAS));
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return sizeof(OlmSAS);
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}
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size_t olm_create_sas_random_length(OlmSAS * sas) {
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return CURVE25519_KEY_LENGTH;
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}
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size_t olm_create_sas(
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OlmSAS * sas,
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void * random, size_t random_length
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) {
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if (random_length < olm_create_sas_random_length(sas)) {
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sas->last_error = OLM_NOT_ENOUGH_RANDOM;
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return (size_t)-1;
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}
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_olm_crypto_curve25519_generate_key((uint8_t *) random, &sas->curve25519_key);
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return 0;
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}
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size_t olm_sas_pubkey_length(OlmSAS * sas) {
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return _olm_encode_base64_length(CURVE25519_KEY_LENGTH);
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}
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size_t olm_sas_get_pubkey(
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OlmSAS * sas,
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void * pubkey, size_t pubkey_length
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) {
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if (pubkey_length < olm_sas_pubkey_length(sas)) {
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sas->last_error = OLM_OUTPUT_BUFFER_TOO_SMALL;
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return (size_t)-1;
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}
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_olm_encode_base64(
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(const uint8_t *)sas->curve25519_key.public_key.public_key,
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CURVE25519_KEY_LENGTH,
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(uint8_t *)pubkey
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);
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return 0;
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}
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size_t olm_sas_set_their_key(
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OlmSAS *sas,
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void * their_key, size_t their_key_length
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) {
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if (their_key_length < olm_sas_pubkey_length(sas)) {
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sas->last_error = OLM_INPUT_BUFFER_TOO_SMALL;
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return (size_t)-1;
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}
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_olm_decode_base64(their_key, their_key_length, their_key);
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_olm_crypto_curve25519_shared_secret(&sas->curve25519_key, their_key, sas->secret);
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return 0;
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}
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size_t olm_sas_generate_bytes(
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OlmSAS * sas,
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const void * info, size_t info_length,
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void * output, size_t output_length
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) {
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_olm_crypto_hkdf_sha256(
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sas->secret, sizeof(sas->secret),
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NULL, 0,
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(const uint8_t *) info, info_length,
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output, output_length
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);
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return 0;
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}
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size_t olm_sas_mac_length(
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OlmSAS *sas
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) {
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return _olm_encode_base64_length(SHA256_OUTPUT_LENGTH);
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}
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size_t olm_sas_calculate_mac(
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OlmSAS * sas,
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void * input, size_t input_length,
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const void * info, size_t info_length,
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void * mac, size_t mac_length
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) {
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if (mac_length < olm_sas_mac_length(sas)) {
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sas->last_error = OLM_OUTPUT_BUFFER_TOO_SMALL;
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return (size_t)-1;
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}
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uint8_t key[32];
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_olm_crypto_hkdf_sha256(
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sas->secret, sizeof(sas->secret),
|
||||
NULL, 0,
|
||||
(const uint8_t *) info, info_length,
|
||||
key, 32
|
||||
);
|
||||
_olm_crypto_hmac_sha256(key, 32, input, input_length, mac);
|
||||
_olm_encode_base64((const uint8_t *)mac, SHA256_OUTPUT_LENGTH, (uint8_t *)mac);
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -0,0 +1,117 @@
|
|||
#include "olm/sas.h"
|
||||
#include "olm/crypto.h"
|
||||
#include "olm/olm.h"
|
||||
|
||||
#include "unittest.hh"
|
||||
|
||||
#include <iostream>
|
||||
|
||||
int main() {
|
||||
|
||||
|
||||
{ /* Generate bytes */
|
||||
|
||||
TestCase test_case("SAS generate bytes");
|
||||
|
||||
std::uint8_t alice_private[32] = {
|
||||
0x77, 0x07, 0x6D, 0x0A, 0x73, 0x18, 0xA5, 0x7D,
|
||||
0x3C, 0x16, 0xC1, 0x72, 0x51, 0xB2, 0x66, 0x45,
|
||||
0xDF, 0x4C, 0x2F, 0x87, 0xEB, 0xC0, 0x99, 0x2A,
|
||||
0xB1, 0x77, 0xFB, 0xA5, 0x1D, 0xB9, 0x2C, 0x2A
|
||||
};
|
||||
|
||||
const std::uint8_t *alice_public = (std::uint8_t *) "hSDwCYkwp1R0i33ctD73Wg2/Og0mOBr066SpjqqbTmo";
|
||||
|
||||
std::uint8_t bob_private[32] = {
|
||||
0x5D, 0xAB, 0x08, 0x7E, 0x62, 0x4A, 0x8A, 0x4B,
|
||||
0x79, 0xE1, 0x7F, 0x8B, 0x83, 0x80, 0x0E, 0xE6,
|
||||
0x6F, 0x3B, 0xB1, 0x29, 0x26, 0x18, 0xB6, 0xFD,
|
||||
0x1C, 0x2F, 0x8B, 0x27, 0xFF, 0x88, 0xE0, 0xEB
|
||||
};
|
||||
|
||||
const std::uint8_t *bob_public = (std::uint8_t *) "3p7bfXt9wbTTW2HC7OQ1Nz+DQ8hbeGdNrfx+FG+IK08";
|
||||
|
||||
std::uint8_t alice_sas_buffer[olm_sas_size()];
|
||||
OlmSAS *alice_sas = olm_sas(alice_sas_buffer);
|
||||
olm_create_sas(alice_sas, alice_private, sizeof(alice_private));
|
||||
std::uint8_t bob_sas_buffer[olm_sas_size()];
|
||||
OlmSAS *bob_sas = olm_sas(bob_sas_buffer);
|
||||
olm_create_sas(bob_sas, bob_private, sizeof(bob_private));
|
||||
|
||||
std::uint8_t pubkey[::olm_sas_pubkey_length(alice_sas)];
|
||||
|
||||
olm_sas_get_pubkey(alice_sas, pubkey, sizeof(pubkey));
|
||||
|
||||
assert_equals(alice_public, pubkey, olm_sas_pubkey_length(alice_sas));
|
||||
|
||||
olm_sas_set_their_key(bob_sas, pubkey, olm_sas_pubkey_length(bob_sas));
|
||||
|
||||
olm_sas_get_pubkey(bob_sas, pubkey, sizeof(pubkey));
|
||||
|
||||
assert_equals(bob_public, pubkey, olm_sas_pubkey_length(bob_sas));
|
||||
|
||||
olm_sas_set_their_key(alice_sas, pubkey, olm_sas_pubkey_length(alice_sas));
|
||||
|
||||
std::uint8_t alice_bytes[6];
|
||||
std::uint8_t bob_bytes[6];
|
||||
|
||||
olm_sas_generate_bytes(alice_sas, "SAS", 3, alice_bytes, 6);
|
||||
olm_sas_generate_bytes(bob_sas, "SAS", 3, bob_bytes, 6);
|
||||
|
||||
assert_equals(alice_bytes, bob_bytes, 6);
|
||||
|
||||
}
|
||||
|
||||
{ /* Calculate MAC */
|
||||
|
||||
TestCase test_case("SAS calculate MAC");
|
||||
|
||||
std::uint8_t alice_private[32] = {
|
||||
0x77, 0x07, 0x6D, 0x0A, 0x73, 0x18, 0xA5, 0x7D,
|
||||
0x3C, 0x16, 0xC1, 0x72, 0x51, 0xB2, 0x66, 0x45,
|
||||
0xDF, 0x4C, 0x2F, 0x87, 0xEB, 0xC0, 0x99, 0x2A,
|
||||
0xB1, 0x77, 0xFB, 0xA5, 0x1D, 0xB9, 0x2C, 0x2A
|
||||
};
|
||||
|
||||
const std::uint8_t *alice_public = (std::uint8_t *) "hSDwCYkwp1R0i33ctD73Wg2/Og0mOBr066SpjqqbTmo";
|
||||
|
||||
std::uint8_t bob_private[32] = {
|
||||
0x5D, 0xAB, 0x08, 0x7E, 0x62, 0x4A, 0x8A, 0x4B,
|
||||
0x79, 0xE1, 0x7F, 0x8B, 0x83, 0x80, 0x0E, 0xE6,
|
||||
0x6F, 0x3B, 0xB1, 0x29, 0x26, 0x18, 0xB6, 0xFD,
|
||||
0x1C, 0x2F, 0x8B, 0x27, 0xFF, 0x88, 0xE0, 0xEB
|
||||
};
|
||||
|
||||
const std::uint8_t *bob_public = (std::uint8_t *) "3p7bfXt9wbTTW2HC7OQ1Nz+DQ8hbeGdNrfx+FG+IK08";
|
||||
|
||||
std::uint8_t alice_sas_buffer[olm_sas_size()];
|
||||
OlmSAS *alice_sas = olm_sas(alice_sas_buffer);
|
||||
olm_create_sas(alice_sas, alice_private, sizeof(alice_private));
|
||||
std::uint8_t bob_sas_buffer[olm_sas_size()];
|
||||
OlmSAS *bob_sas = olm_sas(bob_sas_buffer);
|
||||
olm_create_sas(bob_sas, bob_private, sizeof(bob_private));
|
||||
|
||||
std::uint8_t pubkey[::olm_sas_pubkey_length(alice_sas)];
|
||||
|
||||
olm_sas_get_pubkey(alice_sas, pubkey, sizeof(pubkey));
|
||||
|
||||
assert_equals(alice_public, pubkey, olm_sas_pubkey_length(alice_sas));
|
||||
|
||||
olm_sas_set_their_key(bob_sas, pubkey, olm_sas_pubkey_length(bob_sas));
|
||||
|
||||
olm_sas_get_pubkey(bob_sas, pubkey, sizeof(pubkey));
|
||||
|
||||
assert_equals(bob_public, pubkey, olm_sas_pubkey_length(bob_sas));
|
||||
|
||||
olm_sas_set_their_key(alice_sas, pubkey, olm_sas_pubkey_length(alice_sas));
|
||||
|
||||
std::uint8_t alice_mac[olm_sas_mac_length(alice_sas)];
|
||||
std::uint8_t bob_mac[olm_sas_mac_length(bob_sas)];
|
||||
|
||||
olm_sas_calculate_mac(alice_sas, (void *) "Hello world!", 12, "MAC", 3, alice_mac, olm_sas_mac_length(alice_sas));
|
||||
olm_sas_calculate_mac(bob_sas, (void *) "Hello world!", 12, "MAC", 3, bob_mac, olm_sas_mac_length(bob_sas));
|
||||
|
||||
assert_equals(alice_mac, bob_mac, olm_sas_mac_length(alice_sas));
|
||||
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue