5 EVP_CIPHER_meth_new, EVP_CIPHER_meth_dup, EVP_CIPHER_meth_free,
6 EVP_CIPHER_meth_set_iv_length, EVP_CIPHER_meth_set_flags,
7 EVP_CIPHER_meth_set_impl_ctx_size, EVP_CIPHER_meth_set_init,
8 EVP_CIPHER_meth_set_do_cipher, EVP_CIPHER_meth_set_cleanup,
9 EVP_CIPHER_meth_set_set_asn1_params, EVP_CIPHER_meth_set_get_asn1_params,
10 EVP_CIPHER_meth_set_ctrl, EVP_CIPHER_meth_get_init,
11 EVP_CIPHER_meth_get_do_cipher, EVP_CIPHER_meth_get_cleanup,
12 EVP_CIPHER_meth_get_set_asn1_params, EVP_CIPHER_meth_get_get_asn1_params,
13 EVP_CIPHER_meth_get_ctrl, EVP_CIPHER_up_ref
14 - Routines to build up EVP_CIPHER methods
18 #include <openssl/evp.h>
20 EVP_CIPHER *EVP_CIPHER_meth_new(int cipher_type, int block_size, int key_len);
21 EVP_CIPHER *EVP_CIPHER_meth_dup(const EVP_CIPHER *cipher);
22 void EVP_CIPHER_meth_free(EVP_CIPHER *cipher);
24 int EVP_CIPHER_meth_set_iv_length(EVP_CIPHER *cipher, int iv_len);
25 int EVP_CIPHER_meth_set_flags(EVP_CIPHER *cipher, unsigned long flags);
26 int EVP_CIPHER_meth_set_impl_ctx_size(EVP_CIPHER *cipher, int ctx_size);
27 int EVP_CIPHER_meth_set_init(EVP_CIPHER *cipher,
28 int (*init)(EVP_CIPHER_CTX *ctx,
29 const unsigned char *key,
30 const unsigned char *iv,
32 int EVP_CIPHER_meth_set_do_cipher(EVP_CIPHER *cipher,
33 int (*do_cipher)(EVP_CIPHER_CTX *ctx,
35 const unsigned char *in,
37 int EVP_CIPHER_meth_set_cleanup(EVP_CIPHER *cipher,
38 int (*cleanup)(EVP_CIPHER_CTX *));
39 int EVP_CIPHER_meth_set_set_asn1_params(EVP_CIPHER *cipher,
40 int (*set_asn1_parameters)(EVP_CIPHER_CTX *,
42 int EVP_CIPHER_meth_set_get_asn1_params(EVP_CIPHER *cipher,
43 int (*get_asn1_parameters)(EVP_CIPHER_CTX *,
45 int EVP_CIPHER_meth_set_ctrl(EVP_CIPHER *cipher,
46 int (*ctrl)(EVP_CIPHER_CTX *, int type,
49 int (*EVP_CIPHER_meth_get_init(const EVP_CIPHER *cipher))(EVP_CIPHER_CTX *ctx,
50 const unsigned char *key,
51 const unsigned char *iv,
53 int (*EVP_CIPHER_meth_get_do_cipher(const EVP_CIPHER *cipher))(EVP_CIPHER_CTX *ctx,
55 const unsigned char *in,
57 int (*EVP_CIPHER_meth_get_cleanup(const EVP_CIPHER *cipher))(EVP_CIPHER_CTX *);
58 int (*EVP_CIPHER_meth_get_set_asn1_params(const EVP_CIPHER *cipher))(EVP_CIPHER_CTX *,
60 int (*EVP_CIPHER_meth_get_get_asn1_params(const EVP_CIPHER *cipher))(EVP_CIPHER_CTX *,
62 int (*EVP_CIPHER_meth_get_ctrl(const EVP_CIPHER *cipher))(EVP_CIPHER_CTX *,
66 int EVP_CIPHER_up_ref(EVP_CIPHER *cipher);
70 The B<EVP_CIPHER> type is a structure for symmetric cipher method
73 EVP_CIPHER_meth_new() creates a new B<EVP_CIPHER> structure.
75 EVP_CIPHER_meth_dup() creates a copy of B<cipher>.
77 EVP_CIPHER_meth_free() destroys a B<EVP_CIPHER> structure.
79 EVP_CIPHER_meth_set_iv_length() sets the length of the IV.
80 This is only needed when the implemented cipher mode requires it.
82 EVP_CIPHER_meth_set_flags() sets the flags to describe optional
83 behaviours in the particular B<cipher>.
84 With the exception of cipher modes, of which only one may be present,
85 several flags can be or'd together.
86 The available flags are:
90 =item EVP_CIPH_STREAM_CIPHER, EVP_CIPH_ECB_MODE EVP_CIPH_CBC_MODE,
91 EVP_CIPH_CFB_MODE, EVP_CIPH_OFB_MODE, EVP_CIPH_CTR_MODE, EVP_CIPH_GCM_MODE,
92 EVP_CIPH_CCM_MODE, EVP_CIPH_XTS_MODE, EVP_CIPH_WRAP_MODE,
93 EVP_CIPH_OCB_MODE, EVP_CIPH_SIV_MODE
97 =item EVP_CIPH_VARIABLE_LENGTH
99 This cipher is of variable length.
101 =item EVP_CIPH_CUSTOM_IV
103 Storing and initialising the IV is left entirely to the
106 =item EVP_CIPH_ALWAYS_CALL_INIT
108 Set this if the implementation's init() function should be called even
109 if B<key> is B<NULL>.
111 =item EVP_CIPH_CTRL_INIT
113 Set this to have the implementation's ctrl() function called with
114 command code B<EVP_CTRL_INIT> early in its setup.
116 =item EVP_CIPH_CUSTOM_KEY_LENGTH
118 Checking and setting the key length after creating the B<EVP_CIPHER>
119 is left to the implementation.
120 Whenever someone uses EVP_CIPHER_CTX_set_key_length() on a
121 B<EVP_CIPHER> with this flag set, the implementation's ctrl() function
122 will be called with the control code B<EVP_CTRL_SET_KEY_LENGTH> and
123 the key length in B<arg>.
125 =item EVP_CIPH_NO_PADDING
127 Don't use standard block padding.
129 =item EVP_CIPH_RAND_KEY
131 Making a key with random content is left to the implementation.
132 This is done by calling the implementation's ctrl() function with the
133 control code B<EVP_CTRL_RAND_KEY> and the pointer to the key memory
136 =item EVP_CIPH_CUSTOM_COPY
138 Set this to have the implementation's ctrl() function called with
139 command code B<EVP_CTRL_COPY> at the end of EVP_CIPHER_CTX_copy().
140 The intended use is for further things to deal with after the
141 implementation specific data block has been copied.
142 The destination B<EVP_CIPHER_CTX> is passed to the control with the
144 The implementation specific data block is reached with
145 EVP_CIPHER_CTX_get_cipher_data().
147 =item EVP_CIPH_FLAG_DEFAULT_ASN1
149 Use the default EVP routines to pass IV to and from ASN.1.
151 =item EVP_CIPH_FLAG_LENGTH_BITS
153 Signals that the length of the input buffer for encryption /
154 decryption is to be understood as the number of bits instead of
155 bytes for this implementation.
156 This is only useful for CFB1 ciphers.
159 The FIPS flags seem to be unused, so I'm hiding them until I get an
160 explanation or they get removed. /RL
162 =item EVP_CIPH_FLAG_FIPS
164 =item EVP_CIPH_FLAG_NON_FIPS_ALLOW
168 =item EVP_CIPH_FLAG_CUSTOM_CIPHER
170 This indicates that the implementation takes care of everything,
171 including padding, buffering and finalization.
172 The EVP routines will simply give them control and do nothing more.
174 =item EVP_CIPH_FLAG_AEAD_CIPHER
176 This indicates that this is an AEAD cipher implementation.
178 =item EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
180 Allow interleaving of crypto blocks, a particular optimization only applicable
181 to certain TLS ciphers.
185 EVP_CIPHER_meth_set_impl_ctx_size() sets the size of the EVP_CIPHER's
186 implementation context so that it can be automatically allocated.
188 EVP_CIPHER_meth_set_init() sets the cipher init function for
190 The cipher init function is called by EVP_CipherInit(),
191 EVP_CipherInit_ex(), EVP_EncryptInit(), EVP_EncryptInit_ex(),
192 EVP_DecryptInit(), EVP_DecryptInit_ex().
194 EVP_CIPHER_meth_set_do_cipher() sets the cipher function for
196 The cipher function is called by EVP_CipherUpdate(),
197 EVP_EncryptUpdate(), EVP_DecryptUpdate(), EVP_CipherFinal(),
198 EVP_EncryptFinal(), EVP_EncryptFinal_ex(), EVP_DecryptFinal() and
199 EVP_DecryptFinal_ex().
201 EVP_CIPHER_meth_set_cleanup() sets the function for B<cipher> to do
202 extra cleanup before the method's private data structure is cleaned
204 Note that the cleanup function is passed a B<EVP_CIPHER_CTX *>, the
205 private data structure is then available with
206 EVP_CIPHER_CTX_get_cipher_data().
207 This cleanup function is called by EVP_CIPHER_CTX_reset() and
208 EVP_CIPHER_CTX_free().
210 EVP_CIPHER_meth_set_set_asn1_params() sets the function for B<cipher>
211 to set the AlgorithmIdentifier "parameter" based on the passed cipher.
212 This function is called by EVP_CIPHER_param_to_asn1().
213 EVP_CIPHER_meth_set_get_asn1_params() sets the function for B<cipher>
214 that sets the cipher parameters based on an ASN.1 AlgorithmIdentifier
216 Both these functions are needed when there is a need for custom data
217 (more or other than the cipher IV).
218 They are called by EVP_CIPHER_param_to_asn1() and
219 EVP_CIPHER_asn1_to_param() respectively if defined.
221 EVP_CIPHER_meth_set_ctrl() sets the control function for B<cipher>.
223 EVP_CIPHER_meth_get_init(), EVP_CIPHER_meth_get_do_cipher(),
224 EVP_CIPHER_meth_get_cleanup(), EVP_CIPHER_meth_get_set_asn1_params(),
225 EVP_CIPHER_meth_get_get_asn1_params() and EVP_CIPHER_meth_get_ctrl()
226 are all used to retrieve the method data given with the
227 EVP_CIPHER_meth_set_*() functions above.
229 EVP_CIPHER_up_ref() increments the reference count for an EVP_CIPHER structure.
233 EVP_CIPHER_meth_new() and EVP_CIPHER_meth_dup() return a pointer to a
234 newly created B<EVP_CIPHER>, or NULL on failure.
235 All EVP_CIPHER_meth_set_*() functions return 1.
236 All EVP_CIPHER_meth_get_*() functions return pointers to their
237 respective B<cipher> function.
239 EVP_CIPHER_up_ref() returns 1 for success or 0 otherwise.
247 The functions described here were added in OpenSSL 1.1.0.
251 Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
253 Licensed under the Apache License 2.0 (the "License"). You may not use
254 this file except in compliance with the License. You can obtain a copy
255 in the file LICENSE in the source distribution or at
256 L<https://www.openssl.org/source/license.html>.