23989899232

Committed 04 Apr 2026 11:31PM UTC coverage: 89.44% (-0.01%) from 89.454%

Build # 23989899232

Build Type

Pull #5521

github

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web-flow

Commit Message

Merge fdd9c9e10 into 417709dd7

Pull Request Pull Request #5521: Rollup of small fixes

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92.86

/src/lib/ffi/ffi_cipher.cpp

/*
* (C) 2015,2017 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include <botan/ffi.h>

#include <botan/aead.h>
#include <botan/mem_ops.h>
#include <botan/internal/bit_ops.h>
#include <botan/internal/buffer_slicer.h>
#include <botan/internal/buffer_stuffer.h>
#include <botan/internal/ffi_util.h>
#include <botan/internal/scoped_cleanup.h>

#include <limits>

extern "C" {

using namespace Botan_FFI;

struct botan_cipher_struct final : public botan_struct<Botan::Cipher_Mode, 0xB4A2BF9C> {
   public:
      explicit botan_cipher_struct(std::unique_ptr<Botan::Cipher_Mode> x,
                                   size_t update_size,
                                   size_t ideal_update_size) :
            botan_struct(std::move(x)), m_update_size(update_size), m_ideal_update_size(ideal_update_size) {
         BOTAN_DEBUG_ASSERT(ideal_update_size >= update_size);
         m_buf.reserve(m_ideal_update_size);
      }

      Botan::secure_vector<uint8_t>& buf() { return m_buf; }

      size_t update_size() const { return m_update_size; }

      size_t ideal_update_size() const { return m_ideal_update_size; }

   private:
      Botan::secure_vector<uint8_t> m_buf;
      size_t m_update_size;
      size_t m_ideal_update_size;
};

namespace {

/**
 * Select an update size so that the following constraints are satisfies:
 *
 *   - greater than or equal to the mode's update granularity
 *   - greater than the mode's minimum final size
 *   - the mode's ideal update granularity is a multiple of this size
 *   - (optional) a power of 2
 *
 * Note that this is necessary mostly for backward-compatibility with previous
 * versions of the FFI (prior to Botan 3.5.0). For Botan 4.0.0 we should just
 * directly return the update granularity of the cipher mode and instruct users
 * to switch to botan_cipher_get_ideal_update_granularity() instead. See also
 * the discussion in GitHub Issue #4090.
 */
size_t ffi_choose_update_size(Botan::Cipher_Mode& mode) {
   const size_t update_granularity = mode.update_granularity();
   const size_t ideal_update_granularity = mode.ideal_granularity();
   const size_t minimum_final_size = mode.minimum_final_size();

   // If the minimum final size is zero, or the update_granularity is
   // already greater, just use that.
   if(minimum_final_size == 0 || update_granularity > minimum_final_size) {
      BOTAN_ASSERT_NOMSG(update_granularity > 0);
      return update_granularity;
   }

   // If the ideal granularity is a multiple of the minimum final size, we
   // might be able to use that if it stays within the ideal granularity.
   if(ideal_update_granularity % minimum_final_size == 0 && minimum_final_size * 2 <= ideal_update_granularity) {
      return minimum_final_size * 2;
   }

   // Otherwise, try to use the next power of two greater than the minimum
   // final size, if the ideal granularity is a multiple of that.
   BOTAN_ASSERT_NOMSG(minimum_final_size <= std::numeric_limits<uint16_t>::max());
   const size_t b1 = size_t(1) << Botan::ceil_log2(static_cast<uint16_t>(minimum_final_size));
   if(ideal_update_granularity % b1 == 0) {
      return b1;
   }

   // Last resort: Find the next integer greater than the minimum final size
   //              for which the ideal granularity is a multiple of.
   //              Most sensible cipher modes should never reach this point.
   BOTAN_ASSERT_NOMSG(minimum_final_size < ideal_update_granularity);
   size_t b2 = minimum_final_size + 1;
   for(; b2 < ideal_update_granularity && ideal_update_granularity % b2 != 0; ++b2) {}

   return b2;
}

}  // namespace

int botan_cipher_init(botan_cipher_t* cipher, const char* cipher_name, uint32_t flags) {
   return ffi_guard_thunk(__func__, [=]() -> int {
      if(any_null_pointers(cipher, cipher_name)) {
         return BOTAN_FFI_ERROR_NULL_POINTER;
      }
      const bool encrypt_p = ((flags & BOTAN_CIPHER_INIT_FLAG_MASK_DIRECTION) == BOTAN_CIPHER_INIT_FLAG_ENCRYPT);
      const Botan::Cipher_Dir dir = encrypt_p ? Botan::Cipher_Dir::Encryption : Botan::Cipher_Dir::Decryption;

      std::unique_ptr<Botan::Cipher_Mode> mode(Botan::Cipher_Mode::create(cipher_name, dir));
      if(!mode) {
         return BOTAN_FFI_ERROR_NOT_IMPLEMENTED;
      }

      const size_t update_size = ffi_choose_update_size(*mode);
      const size_t ideal_update_size = std::max(mode->ideal_granularity(), update_size);

      return ffi_new_object(cipher, std::move(mode), update_size, ideal_update_size);
   });
}

int botan_cipher_destroy(botan_cipher_t cipher) {
   return BOTAN_FFI_CHECKED_DELETE(cipher);
}

int botan_cipher_clear(botan_cipher_t cipher) {
   return BOTAN_FFI_VISIT(cipher, [](auto& c) { c.clear(); });
}

int botan_cipher_reset(botan_cipher_t cipher) {
   return BOTAN_FFI_VISIT(cipher, [](auto& c) { c.reset(); });
}

int botan_cipher_output_length(botan_cipher_t cipher, size_t in_len, size_t* out_len) {
   if(out_len == nullptr) {
      return BOTAN_FFI_ERROR_NULL_POINTER;
   }

   return BOTAN_FFI_VISIT(cipher, [=](const auto& c) { *out_len = c.output_length(in_len); });
}

int botan_cipher_query_keylen(botan_cipher_t cipher, size_t* out_minimum_keylength, size_t* out_maximum_keylength) {
   return BOTAN_FFI_VISIT(cipher, [=](const auto& c) {
      if(out_minimum_keylength) {
         *out_minimum_keylength = c.key_spec().minimum_keylength();
      }
      if(out_maximum_keylength) {
         *out_maximum_keylength = c.key_spec().maximum_keylength();
      }
   });
}

int botan_cipher_get_keyspec(botan_cipher_t cipher,
                             size_t* out_minimum_keylength,
                             size_t* out_maximum_keylength,
                             size_t* out_keylength_modulo) {
   return BOTAN_FFI_VISIT(cipher, [=](const auto& c) {
      if(out_minimum_keylength) {
         *out_minimum_keylength = c.key_spec().minimum_keylength();
      }
      if(out_maximum_keylength) {
         *out_maximum_keylength = c.key_spec().maximum_keylength();
      }
      if(out_keylength_modulo) {
         *out_keylength_modulo = c.key_spec().keylength_multiple();
      }
   });
}

int botan_cipher_set_key(botan_cipher_t cipher, const uint8_t* key, size_t key_len) {
   if(key == nullptr) {
      return BOTAN_FFI_ERROR_NULL_POINTER;
   }
   return BOTAN_FFI_VISIT(cipher, [=](auto& c) { c.set_key(key, key_len); });
}

int botan_cipher_start(botan_cipher_t cipher_obj, const uint8_t* nonce, size_t nonce_len) {
   return ffi_guard_thunk(__func__, [=]() -> int {
      Botan::Cipher_Mode& cipher = safe_get(cipher_obj);
      cipher.start(nonce, nonce_len);
      return BOTAN_FFI_SUCCESS;
   });
}

int botan_cipher_update(botan_cipher_t cipher_obj,
                        uint32_t flags,
                        uint8_t output[],
                        size_t output_size,
                        size_t* output_written,
                        const uint8_t input[],
                        size_t input_size,
                        size_t* input_consumed) {
   if(any_null_pointers(output_written, input_consumed)) {
      return BOTAN_FFI_ERROR_NULL_POINTER;
   }

   return ffi_guard_thunk(__func__, [=]() -> int {
      using namespace Botan;
      Cipher_Mode& cipher = safe_get(cipher_obj);
      secure_vector<uint8_t>& mbuf = cipher_obj->buf();

      // If the cipher object's internal buffer contains residual data from
      // a previous invocation, we can be sure that botan_cipher_update() was
      // called with the final flag set but not enough buffer space was provided
      // to accommodate the final output.
      const bool was_finished_before = !mbuf.empty();
      const bool final_input = (flags & BOTAN_CIPHER_UPDATE_FLAG_FINAL) != 0;

      // Bring the output variables into a defined state.
      *output_written = 0;
      *input_consumed = 0;

      // Once the final flag was set once, it must always be set for
      // consecutive invocations.
      if(was_finished_before && !final_input) {
         return BOTAN_FFI_ERROR_INVALID_OBJECT_STATE;
      }

      // If the final flag was set in a previous invocation, no more input
      // data can be processed.
      if(was_finished_before && input_size > 0) {
         return BOTAN_FFI_ERROR_BAD_PARAMETER;
      }

      // Make sure that we always clear the internal buffer before returning
      // or aborting this invocation due to an exception.
      auto clean_buffer = scoped_cleanup([&mbuf] { mbuf.clear(); });

      if(final_input) {
         // If the final flag is set for the first time, we need to process the
         // remaining input data and then finalize the cipher object.
         if(!was_finished_before) {
            *input_consumed = input_size;
            mbuf.resize(input_size);
            copy_mem(mbuf, std::span(input, input_size));

            try {
               cipher.finish(mbuf);
            } catch(Invalid_Authentication_Tag&) {
               return BOTAN_FFI_ERROR_BAD_MAC;
            }
         }

         // At this point, the cipher object is finalized (potentially in a
         // previous invocation) and we can copy the final output to the caller.
         *output_written = mbuf.size();

         // Not enough space to copy the final output out to the caller.
         // Inform them how much space we need for a successful operation.
         if(output_size < mbuf.size()) {
            // This is the only place where mbuf is not cleared before returning.
            clean_buffer.disengage();
            return BOTAN_FFI_ERROR_INSUFFICIENT_BUFFER_SPACE;
         }

         // Copy the final output to the caller, mbuf is cleared afterwards.
         copy_mem(std::span(output, mbuf.size()), mbuf);
      } else {
         // Process data in a streamed fashion without finalizing. No data is
         // ever retained in the cipher object's internal buffer. If we run out
         // of either input data or output capacity, we stop and report that not
         // all bytes were processed via *output_written and *input_consumed.

         BufferSlicer in({input, input_size});
         BufferStuffer out({output, output_size});

         // Helper function to do blockwise processing of data.
         auto blockwise_update = [&](const size_t granularity) {
            if(granularity == 0) {
               return;
            }

            const size_t expected_output_per_iteration = cipher.requires_entire_message() ? 0 : granularity;
            mbuf.resize(granularity);

            while(in.remaining() >= granularity && out.remaining_capacity() >= expected_output_per_iteration) {
               copy_mem(mbuf, in.take(granularity));
               const auto written_bytes = cipher.process(mbuf);
               BOTAN_DEBUG_ASSERT(written_bytes == expected_output_per_iteration);
               if(written_bytes > 0) {
                  BOTAN_ASSERT_NOMSG(written_bytes <= granularity);
                  copy_mem(out.next(written_bytes), std::span(mbuf).first(written_bytes));
               }
            }
         };

         // First, process as much data as possible in chunks of ideal granularity
         blockwise_update(cipher_obj->ideal_update_size());

         // Then process the remaining bytes in chunks of update_size() or, in one go
         // if update_size() is equal to 1 --> i.e. likely a stream cipher.
         const bool is_stream_cipher = (cipher_obj->update_size() == 1);
         const size_t tail_granularity =
            is_stream_cipher ? std::min(in.remaining(), out.remaining_capacity()) : cipher_obj->update_size();
         BOTAN_DEBUG_ASSERT(tail_granularity < cipher_obj->ideal_update_size());
         blockwise_update(tail_granularity);

         // Inform the caller about the amount of data processed.
         *output_written = output_size - out.remaining_capacity();
         *input_consumed = input_size - in.remaining();
      }

      return BOTAN_FFI_SUCCESS;
   });
}

int botan_cipher_set_associated_data(botan_cipher_t cipher, const uint8_t* ad, size_t ad_len) {
   return BOTAN_FFI_VISIT(cipher, [=](auto& c) {
      if(Botan::AEAD_Mode* aead = dynamic_cast<Botan::AEAD_Mode*>(&c)) {
         aead->set_associated_data(ad, ad_len);
         return BOTAN_FFI_SUCCESS;
      }
      return BOTAN_FFI_ERROR_BAD_PARAMETER;
   });
}

int botan_cipher_valid_nonce_length(botan_cipher_t cipher, size_t nl) {
   return BOTAN_FFI_VISIT(cipher, [=](const auto& c) { return c.valid_nonce_length(nl) ? 1 : 0; });
}

int botan_cipher_get_default_nonce_length(botan_cipher_t cipher, size_t* nl) {
   if(nl == nullptr) {
      return BOTAN_FFI_ERROR_NULL_POINTER;
   }
   return BOTAN_FFI_VISIT(cipher, [=](const auto& c) { *nl = c.default_nonce_length(); });
}

int botan_cipher_get_update_granularity(botan_cipher_t cipher, size_t* ug) {
   if(ug == nullptr) {
      return BOTAN_FFI_ERROR_NULL_POINTER;
   }
   return BOTAN_FFI_VISIT(cipher, [=](const auto& /*c*/) { *ug = cipher->update_size(); });
}

int botan_cipher_get_ideal_update_granularity(botan_cipher_t cipher, size_t* ug) {
   if(ug == nullptr) {
      return BOTAN_FFI_ERROR_NULL_POINTER;
   }
   return BOTAN_FFI_VISIT(cipher, [=](const auto& c) { *ug = c.ideal_granularity(); });
}

int botan_cipher_get_tag_length(botan_cipher_t cipher, size_t* tl) {
   if(tl == nullptr) {
      return BOTAN_FFI_ERROR_NULL_POINTER;
   }
   return BOTAN_FFI_VISIT(cipher, [=](const auto& c) { *tl = c.tag_size(); });
}

int botan_cipher_is_authenticated(botan_cipher_t cipher) {
   return BOTAN_FFI_VISIT(cipher, [=](const auto& c) { return c.authenticated() ? 1 : 0; });
}

int botan_cipher_requires_entire_message(botan_cipher_t cipher) {
   return BOTAN_FFI_VISIT(cipher, [=](const auto& c) { return c.requires_entire_message() ? 1 : 0; });
}

int botan_cipher_name(botan_cipher_t cipher, char* name, size_t* name_len) {
   return BOTAN_FFI_VISIT(cipher, [=](const auto& c) { return write_str_output(name, name_len, c.name()); });
}
}

1	/*
2	* (C) 2015,2017 Jack Lloyd
3	*
4	* Botan is released under the Simplified BSD License (see license.txt)
5	*/
6
7	#include <botan/ffi.h>
8
9	#include <botan/aead.h>
10	#include <botan/mem_ops.h>
11	#include <botan/internal/bit_ops.h>
12	#include <botan/internal/buffer_slicer.h>
13	#include <botan/internal/buffer_stuffer.h>
14	#include <botan/internal/ffi_util.h>
15	#include <botan/internal/scoped_cleanup.h>
16
17	#include <limits>
18
19	extern "C" {
20
21	using namespace Botan_FFI;
22
23	struct botan_cipher_struct final : public botan_struct<Botan::Cipher_Mode, 0xB4A2BF9C> {
24	public:
25	explicit botan_cipher_struct(std::unique_ptr<Botan::Cipher_Mode> x,	31✔
26	size_t update_size,
27	size_t ideal_update_size) :	31✔
28	botan_struct(std::move(x)), m_update_size(update_size), m_ideal_update_size(ideal_update_size) {	31✔
29	BOTAN_DEBUG_ASSERT(ideal_update_size >= update_size);	31✔
30	m_buf.reserve(m_ideal_update_size);	31✔
31	}	31✔
32
33	Botan::secure_vector<uint8_t>& buf() { return m_buf; }	103✔
34
35	size_t update_size() const { return m_update_size; }	92✔
36
37	size_t ideal_update_size() const { return m_ideal_update_size; }	64✔
38
39	private:
40	Botan::secure_vector<uint8_t> m_buf;
41	size_t m_update_size;
42	size_t m_ideal_update_size;
43	};
44
45	namespace {
46
47	/**
48	* Select an update size so that the following constraints are satisfies:
49	*
50	* - greater than or equal to the mode's update granularity
51	* - greater than the mode's minimum final size
52	* - the mode's ideal update granularity is a multiple of this size
53	* - (optional) a power of 2
54	*
55	* Note that this is necessary mostly for backward-compatibility with previous
56	* versions of the FFI (prior to Botan 3.5.0). For Botan 4.0.0 we should just
57	* directly return the update granularity of the cipher mode and instruct users
58	* to switch to botan_cipher_get_ideal_update_granularity() instead. See also
59	* the discussion in GitHub Issue #4090.
60	*/
61	size_t ffi_choose_update_size(Botan::Cipher_Mode& mode) {	31✔
62	const size_t update_granularity = mode.update_granularity();	31✔
63	const size_t ideal_update_granularity = mode.ideal_granularity();	31✔
64	const size_t minimum_final_size = mode.minimum_final_size();	31✔
65
66	// If the minimum final size is zero, or the update_granularity is
67	// already greater, just use that.
68	if(minimum_final_size == 0 \|\| update_granularity > minimum_final_size) {	31✔
69	BOTAN_ASSERT_NOMSG(update_granularity > 0);	15✔
70	return update_granularity;
71	}
72
73	// If the ideal granularity is a multiple of the minimum final size, we
74	// might be able to use that if it stays within the ideal granularity.
75	if(ideal_update_granularity % minimum_final_size == 0 && minimum_final_size * 2 <= ideal_update_granularity) {	16✔
76	return minimum_final_size * 2;
77	}
78
79	// Otherwise, try to use the next power of two greater than the minimum
80	// final size, if the ideal granularity is a multiple of that.
81	BOTAN_ASSERT_NOMSG(minimum_final_size <= std::numeric_limits<uint16_t>::max());	×
82	const size_t b1 = size_t(1) << Botan::ceil_log2(static_cast<uint16_t>(minimum_final_size));	×
83	if(ideal_update_granularity % b1 == 0) {	×
84	return b1;
85	}
86
87	// Last resort: Find the next integer greater than the minimum final size
88	// for which the ideal granularity is a multiple of.
89	// Most sensible cipher modes should never reach this point.
90	BOTAN_ASSERT_NOMSG(minimum_final_size < ideal_update_granularity);	×
91	size_t b2 = minimum_final_size + 1;	×
92	for(; b2 < ideal_update_granularity && ideal_update_granularity % b2 != 0; ++b2) {}	×
93
94	return b2;
95	}
96
97	} // namespace
98
99	int botan_cipher_init(botan_cipher_t* cipher, const char* cipher_name, uint32_t flags) {	31✔
100	return ffi_guard_thunk(__func__, [=]() -> int {	31✔
101	if(any_null_pointers(cipher, cipher_name)) {	31✔
102	return BOTAN_FFI_ERROR_NULL_POINTER;
103	}
104	const bool encrypt_p = ((flags & BOTAN_CIPHER_INIT_FLAG_MASK_DIRECTION) == BOTAN_CIPHER_INIT_FLAG_ENCRYPT);	31✔
105	const Botan::Cipher_Dir dir = encrypt_p ? Botan::Cipher_Dir::Encryption : Botan::Cipher_Dir::Decryption;	31✔
106
107	std::unique_ptr<Botan::Cipher_Mode> mode(Botan::Cipher_Mode::create(cipher_name, dir));	31✔
108	if(!mode) {	31✔
109	return BOTAN_FFI_ERROR_NOT_IMPLEMENTED;
110	}
111
112	const size_t update_size = ffi_choose_update_size(*mode);	31✔
113	const size_t ideal_update_size = std::max(mode->ideal_granularity(), update_size);	31✔
114
115	return ffi_new_object(cipher, std::move(mode), update_size, ideal_update_size);	31✔
116	});	31✔
117	}
118
119	int botan_cipher_destroy(botan_cipher_t cipher) {	31✔
120	return BOTAN_FFI_CHECKED_DELETE(cipher);	31✔
121	}
122
123	int botan_cipher_clear(botan_cipher_t cipher) {	8✔
124	return BOTAN_FFI_VISIT(cipher, [](auto& c) { c.clear(); });	16✔
125	}
126
127	int botan_cipher_reset(botan_cipher_t cipher) {	4✔
128	return BOTAN_FFI_VISIT(cipher, [](auto& c) { c.reset(); });	8✔
129	}
130
131	int botan_cipher_output_length(botan_cipher_t cipher, size_t in_len, size_t* out_len) {	4✔
132	if(out_len == nullptr) {	4✔
133	return BOTAN_FFI_ERROR_NULL_POINTER;
134	}
135
136	return BOTAN_FFI_VISIT(cipher, [=](const auto& c) { *out_len = c.output_length(in_len); });	8✔
137	}
138
139	int botan_cipher_query_keylen(botan_cipher_t cipher, size_t* out_minimum_keylength, size_t* out_maximum_keylength) {	13✔
140	return BOTAN_FFI_VISIT(cipher, [=](const auto& c) {	26✔
141	if(out_minimum_keylength) {
142	*out_minimum_keylength = c.key_spec().minimum_keylength();
143	}
144	if(out_maximum_keylength) {
145	*out_maximum_keylength = c.key_spec().maximum_keylength();
146	}
147	});
148	}
149
150	int botan_cipher_get_keyspec(botan_cipher_t cipher,	1✔
151	size_t* out_minimum_keylength,
152	size_t* out_maximum_keylength,
153	size_t* out_keylength_modulo) {
154	return BOTAN_FFI_VISIT(cipher, [=](const auto& c) {	2✔
155	if(out_minimum_keylength) {
156	*out_minimum_keylength = c.key_spec().minimum_keylength();
157	}
158	if(out_maximum_keylength) {
159	*out_maximum_keylength = c.key_spec().maximum_keylength();
160	}
161	if(out_keylength_modulo) {
162	*out_keylength_modulo = c.key_spec().keylength_multiple();
163	}
164	});
165	}
166
167	int botan_cipher_set_key(botan_cipher_t cipher, const uint8_t* key, size_t key_len) {	43✔
168	if(key == nullptr) {	43✔
169	return BOTAN_FFI_ERROR_NULL_POINTER;
170	}
171	return BOTAN_FFI_VISIT(cipher, [=](auto& c) { c.set_key(key, key_len); });	86✔
172	}
173
174	int botan_cipher_start(botan_cipher_t cipher_obj, const uint8_t* nonce, size_t nonce_len) {	47✔
175	return ffi_guard_thunk(__func__, [=]() -> int {	47✔
176	Botan::Cipher_Mode& cipher = safe_get(cipher_obj);	47✔
177	cipher.start(nonce, nonce_len);	47✔
178	return BOTAN_FFI_SUCCESS;	47✔
179	});	47✔
180	}
181
182	int botan_cipher_update(botan_cipher_t cipher_obj,	103✔
183	uint32_t flags,
184	uint8_t output[],
185	size_t output_size,
186	size_t* output_written,
187	const uint8_t input[],
188	size_t input_size,
189	size_t* input_consumed) {
190	if(any_null_pointers(output_written, input_consumed)) {	103✔
191	return BOTAN_FFI_ERROR_NULL_POINTER;
192	}
193
194	return ffi_guard_thunk(__func__, [=]() -> int {	103✔
195	using namespace Botan;	103✔
196	Cipher_Mode& cipher = safe_get(cipher_obj);	103✔
197	secure_vector<uint8_t>& mbuf = cipher_obj->buf();	103✔
198
199	// If the cipher object's internal buffer contains residual data from
200	// a previous invocation, we can be sure that botan_cipher_update() was
201	// called with the final flag set but not enough buffer space was provided
202	// to accommodate the final output.
203	const bool was_finished_before = !mbuf.empty();	103✔
204	const bool final_input = (flags & BOTAN_CIPHER_UPDATE_FLAG_FINAL) != 0;	103✔
205
206	// Bring the output variables into a defined state.
207	*output_written = 0;	103✔
208	*input_consumed = 0;	103✔
209
210	// Once the final flag was set once, it must always be set for
211	// consecutive invocations.
212	if(was_finished_before && !final_input) {	103✔
213	return BOTAN_FFI_ERROR_INVALID_OBJECT_STATE;
214	}
215
216	// If the final flag was set in a previous invocation, no more input
217	// data can be processed.
218	if(was_finished_before && input_size > 0) {	103✔
219	return BOTAN_FFI_ERROR_BAD_PARAMETER;
220	}
221
222	// Make sure that we always clear the internal buffer before returning
223	// or aborting this invocation due to an exception.
224	auto clean_buffer = scoped_cleanup([&mbuf] { mbuf.clear(); });	301✔
225
226	if(final_input) {	103✔
227	// If the final flag is set for the first time, we need to process the
228	// remaining input data and then finalize the cipher object.
229	if(!was_finished_before) {	39✔
230	*input_consumed = input_size;	34✔
231	mbuf.resize(input_size);	34✔
232	copy_mem(mbuf, std::span(input, input_size));	34✔
233
234	try {	34✔
235	cipher.finish(mbuf);	34✔
236	} catch(Invalid_Authentication_Tag&) {	×
237	return BOTAN_FFI_ERROR_BAD_MAC;	×
238	}	×
239	}
240
241	// At this point, the cipher object is finalized (potentially in a
242	// previous invocation) and we can copy the final output to the caller.
243	*output_written = mbuf.size();	39✔
244
245	// Not enough space to copy the final output out to the caller.
246	// Inform them how much space we need for a successful operation.
247	if(output_size < mbuf.size()) {	39✔
248	// This is the only place where mbuf is not cleared before returning.
249	clean_buffer.disengage();
250	return BOTAN_FFI_ERROR_INSUFFICIENT_BUFFER_SPACE;
251	}
252
253	// Copy the final output to the caller, mbuf is cleared afterwards.
254	copy_mem(std::span(output, mbuf.size()), mbuf);	34✔
255	} else {
256	// Process data in a streamed fashion without finalizing. No data is
257	// ever retained in the cipher object's internal buffer. If we run out
258	// of either input data or output capacity, we stop and report that not
259	// all bytes were processed via output_written and input_consumed.
260
261	BufferSlicer in({input, input_size});	64✔
262	BufferStuffer out({output, output_size});	64✔
263
264	// Helper function to do blockwise processing of data.
265	auto blockwise_update = [&](const size_t granularity) {	192✔
266	if(granularity == 0) {	128✔
267	return;
268	}
269
270	const size_t expected_output_per_iteration = cipher.requires_entire_message() ? 0 : granularity;	100✔
271	mbuf.resize(granularity);	100✔
272
273	while(in.remaining() >= granularity && out.remaining_capacity() >= expected_output_per_iteration) {	262✔
274	copy_mem(mbuf, in.take(granularity));	62✔
275	const auto written_bytes = cipher.process(mbuf);	62✔
276	BOTAN_DEBUG_ASSERT(written_bytes == expected_output_per_iteration);	62✔
277	if(written_bytes > 0) {	62✔
278	BOTAN_ASSERT_NOMSG(written_bytes <= granularity);	42✔
279	copy_mem(out.next(written_bytes), std::span(mbuf).first(written_bytes));	42✔
280	}
281	}
282	};	64✔
283
284	// First, process as much data as possible in chunks of ideal granularity
285	blockwise_update(cipher_obj->ideal_update_size());	64✔
286
287	// Then process the remaining bytes in chunks of update_size() or, in one go
288	// if update_size() is equal to 1 --> i.e. likely a stream cipher.
289	const bool is_stream_cipher = (cipher_obj->update_size() == 1);	64✔
290	const size_t tail_granularity =	64✔
291	is_stream_cipher ? std::min(in.remaining(), out.remaining_capacity()) : cipher_obj->update_size();	64✔
292	BOTAN_DEBUG_ASSERT(tail_granularity < cipher_obj->ideal_update_size());	64✔
293	blockwise_update(tail_granularity);	64✔
294
295	// Inform the caller about the amount of data processed.
296	*output_written = output_size - out.remaining_capacity();	64✔
297	*input_consumed = input_size - in.remaining();	64✔
298	}
299
300	return BOTAN_FFI_SUCCESS;
301	});	206✔
302	}
303
304	int botan_cipher_set_associated_data(botan_cipher_t cipher, const uint8_t* ad, size_t ad_len) {	8✔
305	return BOTAN_FFI_VISIT(cipher, [=](auto& c) {	16✔
306	if(Botan::AEAD_Mode* aead = dynamic_cast<Botan::AEAD_Mode*>(&c)) {
307	aead->set_associated_data(ad, ad_len);
308	return BOTAN_FFI_SUCCESS;
309	}
310	return BOTAN_FFI_ERROR_BAD_PARAMETER;
311	});
312	}
313
314	int botan_cipher_valid_nonce_length(botan_cipher_t cipher, size_t nl) {	6✔
315	return BOTAN_FFI_VISIT(cipher, [=](const auto& c) { return c.valid_nonce_length(nl) ? 1 : 0; });	12✔
316	}
317
318	int botan_cipher_get_default_nonce_length(botan_cipher_t cipher, size_t* nl) {	12✔
319	if(nl == nullptr) {	12✔
320	return BOTAN_FFI_ERROR_NULL_POINTER;
321	}
322	return BOTAN_FFI_VISIT(cipher, [=](const auto& c) { *nl = c.default_nonce_length(); });	24✔
323	}
324
325	int botan_cipher_get_update_granularity(botan_cipher_t cipher, size_t* ug) {	28✔
326	if(ug == nullptr) {	28✔
327	return BOTAN_FFI_ERROR_NULL_POINTER;
328	}
329	return BOTAN_FFI_VISIT(cipher, [=](const auto& /c/) { *ug = cipher->update_size(); });	56✔
330	}
331
332	int botan_cipher_get_ideal_update_granularity(botan_cipher_t cipher, size_t* ug) {	28✔
333	if(ug == nullptr) {	28✔
334	return BOTAN_FFI_ERROR_NULL_POINTER;
335	}
336	return BOTAN_FFI_VISIT(cipher, [=](const auto& c) { *ug = c.ideal_granularity(); });	56✔
337	}
338
339	int botan_cipher_get_tag_length(botan_cipher_t cipher, size_t* tl) {	16✔
340	if(tl == nullptr) {	16✔
341	return BOTAN_FFI_ERROR_NULL_POINTER;
342	}
343	return BOTAN_FFI_VISIT(cipher, [=](const auto& c) { *tl = c.tag_size(); });	32✔
344	}
345
346	int botan_cipher_is_authenticated(botan_cipher_t cipher) {	15✔
347	return BOTAN_FFI_VISIT(cipher, [=](const auto& c) { return c.authenticated() ? 1 : 0; });	30✔
348	}
349
350	int botan_cipher_requires_entire_message(botan_cipher_t cipher) {	5✔
351	return BOTAN_FFI_VISIT(cipher, [=](const auto& c) { return c.requires_entire_message() ? 1 : 0; });	10✔
352	}
353
354	int botan_cipher_name(botan_cipher_t cipher, char* name, size_t* name_len) {	8✔
355	return BOTAN_FFI_VISIT(cipher, [=](const auto& c) { return write_str_output(name, name_len, c.name()); });	16✔
356	}
357	}

randombit / botan / 23989899232

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