21712952425

Committed 05 Feb 2026 01:16PM UTC coverage: 90.076% (+0.005%) from 90.071%

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Pull #5287

github

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web-flow

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Merge 1b320c06e into 8c9623340

Pull Request Pull Request #5287: Split out BufferSlicer and BufferStuffer to their own headers

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

randombit / botan / 21712952425

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