| 1 | =pod
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| 2 |
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| 3 | =head1 NAME
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| 4 |
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| 5 | life_cycle-cipher - The cipher algorithm life-cycle
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| 6 |
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| 7 | =head1 DESCRIPTION
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| 8 |
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| 9 | All symmetric ciphers (CIPHERs) go through a number of stages in their
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| 10 | life-cycle:
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| 11 |
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| 12 | =over 4
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| 13 |
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| 14 | =item start
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| 15 |
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| 16 | This state represents the CIPHER before it has been allocated. It is the
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| 17 | starting state for any life-cycle transitions.
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| 18 |
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| 19 | =item newed
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| 20 |
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| 21 | This state represents the CIPHER after it has been allocated.
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| 22 |
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| 23 | =item initialised
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| 24 |
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| 25 | These states represent the CIPHER when it is set up and capable of processing
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| 26 | input. There are three possible initialised states:
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| 27 |
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| 28 | =over 4
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| 29 |
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| 30 | =item initialised using EVP_CipherInit
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| 31 |
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| 32 | =item initialised for decryption using EVP_DecryptInit
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| 33 |
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| 34 | =item initialised for encryption using EVP_EncryptInit
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| 35 |
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| 36 | =back
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| 37 |
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| 38 | =item updated
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| 39 |
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| 40 | These states represent the CIPHER when it is set up and capable of processing
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| 41 | additional input or generating output. The three possible states directly
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| 42 | correspond to those for initialised above. The three different streams should
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| 43 | not be mixed.
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| 44 |
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| 45 | =item finaled
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| 46 |
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| 47 | This state represents the CIPHER when it has generated output.
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| 48 |
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| 49 | =item freed
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| 50 |
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| 51 | This state is entered when the CIPHER is freed. It is the terminal state
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| 52 | for all life-cycle transitions.
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| 53 |
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| 54 | =back
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| 55 |
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| 56 | =head2 State Transition Diagram
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| 57 |
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| 58 | The usual life-cycle of a CIPHER is illustrated:
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| 59 |
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| 60 | =begin man
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| 61 |
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| 62 | +---------------------------+
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| 63 | | |
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| 64 | | start |
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| 65 | | |
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| 66 | +---------------------------+ + - - - - - - - - - - - - - +
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| 67 | | ' any of the initialised '
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| 68 | | EVP_CIPHER_CTX_new ' updated or finaled states '
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| 69 | v ' '
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| 70 | +---------------------------+ + - - - - - - - - - - - - - +
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| 71 | | | |
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| 72 | | newed | | EVP_CIPHER_CTX_reset
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| 73 | | | <----+
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| 74 | +---------------------------+
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| 75 | | | |
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| 76 | +---------+ | +---------+
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| 77 | EVP_DecryptInit | | EVP_CipherInit | EVP_EncryptInit
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| 78 | v v v
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| 79 | +---------------------------+ +---------------------------+ +---------------------------+
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| 80 | | | | | | |
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| 81 | | initialised | | initialised | | initialised |
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| 82 | | for decryption | | | | for encryption |
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| 83 | +---------------------------+ +---------------------------+ +---------------------------+
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| 84 | | | |
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| 85 | | EVP_DecryptUpdate | EVP_CipherUpdate EVP_EncryptUpdate |
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| 86 | | v |
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| 87 | | +---------------------------+ |
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| 88 | | | |--------------------+ |
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| 89 | | | updated | EVP_CipherUpdate | |
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| 90 | | | | <------------------+ |
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| 91 | v +---------------------------+ v
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| 92 | +---------------------------+ | +---------------------------+
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| 93 | | |---------------------+ | | |
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| 94 | | updated | EVP_DecryptUpdate | | | updated |------+
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| 95 | | for decryption | <-------------------+ | | for encryption | |
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| 96 | +---------------------------+ | +---------------------------+ |
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| 97 | | EVP_CipherFinal | | ^ |
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| 98 | +-------+ | +--------+ | |
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| 99 | EVP_DecryptFinal | | | EVP_EncryptFinal +-------------------+
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| 100 | v v v EVP_EncryptUpdate
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| 101 | +---------------------------+
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| 102 | | |-----------------------------+
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| 103 | | finaled | |
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| 104 | | | <---------------------------+
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| 105 | +---------------------------+ EVP_CIPHER_CTX_get_params
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| 106 | | (AEAD encryption)
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| 107 | | EVP_CIPHER_CTX_free
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| 108 | v
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| 109 | +---------------------------+
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| 110 | | |
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| 111 | | freed |
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| 112 | | |
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| 113 | +---------------------------+
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| 114 |
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| 115 | =end man
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| 116 |
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| 117 | =for html <img src="img/cipher.png">
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| 118 |
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| 119 | =head2 Formal State Transitions
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| 120 |
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| 121 | This section defines all of the legal state transitions.
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| 122 | This is the canonical list.
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| 123 |
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| 124 | =begin man
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| 125 |
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| 126 | Function Call ---------------------------------------------- Current State -----------------------------------------------
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| 127 | start newed initialised updated finaled initialised updated initialised updated freed
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| 128 | decryption decryption encryption encryption
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| 129 | EVP_CIPHER_CTX_new newed
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| 130 | EVP_CipherInit initialised initialised initialised initialised initialised initialised initialised initialised
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| 131 | EVP_DecryptInit initialised initialised initialised initialised initialised initialised initialised initialised
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| 132 | decryption decryption decryption decryption decryption decryption decryption decryption
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| 133 | EVP_EncryptInit initialised initialised initialised initialised initialised initialised initialised initialised
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| 134 | encryption encryption encryption encryption encryption encryption encryption encryption
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| 135 | EVP_CipherUpdate updated updated
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| 136 | EVP_DecryptUpdate updated updated
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| 137 | decryption decryption
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| 138 | EVP_EncryptUpdate updated updated
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| 139 | encryption encryption
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| 140 | EVP_CipherFinal finaled
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| 141 | EVP_DecryptFinal finaled
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| 142 | EVP_EncryptFinal finaled
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| 143 | EVP_CIPHER_CTX_free freed freed freed freed freed freed freed freed freed
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| 144 | EVP_CIPHER_CTX_reset newed newed newed newed newed newed newed newed
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| 145 | EVP_CIPHER_CTX_get_params newed initialised updated initialised updated initialised updated
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| 146 | decryption decryption encryption encryption
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| 147 | EVP_CIPHER_CTX_set_params newed initialised updated initialised updated initialised updated
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| 148 | decryption decryption encryption encryption
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| 149 | EVP_CIPHER_CTX_gettable_params newed initialised updated initialised updated initialised updated
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| 150 | decryption decryption encryption encryption
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| 151 | EVP_CIPHER_CTX_settable_params newed initialised updated initialised updated initialised updated
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| 152 | decryption decryption encryption encryption
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| 153 |
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| 154 | =end man
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| 155 |
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| 156 | =begin html
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| 157 |
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| 158 | <table style="border:1px solid; border-collapse:collapse">
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| 159 | <tr><th style="border:1px solid" align="left">Function Call</th>
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| 160 | <th style="border:1px solid" colspan="10">Current State</th></tr>
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| 161 | <tr><th style="border:1px solid"></th>
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| 162 | <th style="border:1px solid" align="center">start</th>
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| 163 | <th style="border:1px solid" align="center">newed</th>
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| 164 | <th style="border:1px solid" align="center">initialised</th>
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| 165 | <th style="border:1px solid" align="center">updated</th>
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| 166 | <th style="border:1px solid" align="center">finaled</th>
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| 167 | <th style="border:1px solid" align="center">initialised<br>decryption</th>
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| 168 | <th style="border:1px solid" align="center">updated<br>decryption</th>
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| 169 | <th style="border:1px solid" align="center">initialised<br>encryption</th>
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| 170 | <th style="border:1px solid" align="center">updated<br>encryption</th>
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| 171 | <th style="border:1px solid" align="center">freed</th></tr>
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| 172 | <tr><th style="border:1px solid" align="left">EVP_CIPHER_CTX_new</th>
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| 173 | <td style="border:1px solid" align="center">newed</td>
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| 174 | <td style="border:1px solid" align="center"></td>
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| 175 | <td style="border:1px solid" align="center"></td>
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| 176 | <td style="border:1px solid" align="center"></td>
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| 177 | <td style="border:1px solid" align="center"></td>
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| 178 | <td style="border:1px solid" align="center"></td>
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| 179 | <td style="border:1px solid" align="center"></td>
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| 180 | <td style="border:1px solid" align="center"></td>
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| 181 | <td style="border:1px solid" align="center"></td>
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| 182 | <td style="border:1px solid" align="center"></td></tr>
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| 183 | <tr><th style="border:1px solid" align="left">EVP_CipherInit</th>
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| 184 | <td style="border:1px solid" align="center"></td>
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| 185 | <td style="border:1px solid" align="center">initialised</td>
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| 186 | <td style="border:1px solid" align="center">initialised</td>
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| 187 | <td style="border:1px solid" align="center">initialised</td>
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| 188 | <td style="border:1px solid" align="center">initialised</td>
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| 189 | <td style="border:1px solid" align="center">initialised</td>
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| 190 | <td style="border:1px solid" align="center">initialised</td>
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| 191 | <td style="border:1px solid" align="center">initialised</td>
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| 192 | <td style="border:1px solid" align="center">initialised</td>
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| 193 | <td style="border:1px solid" align="center"></td></tr>
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| 194 | <tr><th style="border:1px solid" align="left">EVP_DecryptInit</th>
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| 195 | <td style="border:1px solid" align="center"></td>
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| 196 | <td style="border:1px solid" align="center">initialised<br>decryption</td>
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| 197 | <td style="border:1px solid" align="center">initialised<br>decryption</td>
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| 198 | <td style="border:1px solid" align="center">initialised<br>decryption</td>
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| 199 | <td style="border:1px solid" align="center">initialised<br>decryption</td>
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| 200 | <td style="border:1px solid" align="center">initialised<br>decryption</td>
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| 201 | <td style="border:1px solid" align="center">initialised<br>decryption</td>
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| 202 | <td style="border:1px solid" align="center">initialised<br>decryption</td>
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| 203 | <td style="border:1px solid" align="center">initialised<br>decryption</td>
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| 204 | <td style="border:1px solid" align="center"></td></tr>
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| 205 | <tr><th style="border:1px solid" align="left">EVP_EncryptInit</th>
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| 206 | <td style="border:1px solid" align="center"></td>
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| 207 | <td style="border:1px solid" align="center">initialised<br>encryption</td>
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| 208 | <td style="border:1px solid" align="center">initialised<br>encryption</td>
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| 209 | <td style="border:1px solid" align="center">initialised<br>encryption</td>
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| 210 | <td style="border:1px solid" align="center">initialised<br>encryption</td>
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| 211 | <td style="border:1px solid" align="center">initialised<br>encryption</td>
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| 212 | <td style="border:1px solid" align="center">initialised<br>encryption</td>
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| 213 | <td style="border:1px solid" align="center">initialised<br>encryption</td>
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| 214 | <td style="border:1px solid" align="center">initialised<br>encryption</td>
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| 215 | <td style="border:1px solid" align="center"></td></tr>
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| 216 | <tr><th style="border:1px solid" align="left">EVP_CipherUpdate</th>
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| 217 | <td style="border:1px solid" align="center"></td>
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| 218 | <td style="border:1px solid" align="center"></td>
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| 219 | <td style="border:1px solid" align="center">updated</td>
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| 220 | <td style="border:1px solid" align="center">updated</td>
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| 221 | <td style="border:1px solid" align="center"></td>
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| 222 | <td style="border:1px solid" align="center"></td>
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| 223 | <td style="border:1px solid" align="center"></td>
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| 224 | <td style="border:1px solid" align="center"></td>
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| 225 | <td style="border:1px solid" align="center"></td>
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| 226 | <td style="border:1px solid" align="center"></td></tr>
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| 227 | <tr><th style="border:1px solid" align="left">EVP_DecryptUpdate</th>
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| 228 | <td style="border:1px solid" align="center"></td>
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| 229 | <td style="border:1px solid" align="center"></td>
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| 230 | <td style="border:1px solid" align="center"></td>
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| 231 | <td style="border:1px solid" align="center"></td>
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| 232 | <td style="border:1px solid" align="center"></td>
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| 233 | <td style="border:1px solid" align="center">updated<br>decryption</td>
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| 234 | <td style="border:1px solid" align="center">updated<br>decryption</td>
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| 235 | <td style="border:1px solid" align="center"></td>
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| 236 | <td style="border:1px solid" align="center"></td>
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| 237 | <td style="border:1px solid" align="center"></td></tr>
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| 238 | <tr><th style="border:1px solid" align="left">EVP_EncryptUpdate</th>
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| 239 | <td style="border:1px solid" align="center"></td>
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| 240 | <td style="border:1px solid" align="center"></td>
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| 241 | <td style="border:1px solid" align="center"></td>
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| 242 | <td style="border:1px solid" align="center"></td>
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| 243 | <td style="border:1px solid" align="center"></td>
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| 244 | <td style="border:1px solid" align="center"></td>
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| 245 | <td style="border:1px solid" align="center"></td>
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| 246 | <td style="border:1px solid" align="center">updated<br>encryption</td>
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| 247 | <td style="border:1px solid" align="center">updated<br>encryption</td>
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| 248 | <td style="border:1px solid" align="center"></td></tr>
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| 249 | <tr><th style="border:1px solid" align="left">EVP_CipherFinal</th>
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| 250 | <td style="border:1px solid" align="center"></td>
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| 251 | <td style="border:1px solid" align="center"></td>
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| 252 | <td style="border:1px solid" align="center"></td>
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| 253 | <td style="border:1px solid" align="center">finaled</td>
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| 254 | <td style="border:1px solid" align="center"></td>
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| 255 | <td style="border:1px solid" align="center"></td>
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| 256 | <td style="border:1px solid" align="center"></td>
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| 257 | <td style="border:1px solid" align="center"></td>
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| 258 | <td style="border:1px solid" align="center"></td>
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| 259 | <td style="border:1px solid" align="center"></td></tr>
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| 260 | <tr><th style="border:1px solid" align="left">EVP_DecryptFinal</th>
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| 261 | <td style="border:1px solid" align="center"></td>
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| 262 | <td style="border:1px solid" align="center"></td>
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| 263 | <td style="border:1px solid" align="center"></td>
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| 264 | <td style="border:1px solid" align="center"></td>
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| 265 | <td style="border:1px solid" align="center"></td>
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| 266 | <td style="border:1px solid" align="center"></td>
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| 267 | <td style="border:1px solid" align="center">finaled<br>decryption</td>
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| 268 | <td style="border:1px solid" align="center"></td>
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| 269 | <td style="border:1px solid" align="center"></td>
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| 270 | <td style="border:1px solid" align="center"></td></tr>
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| 271 | <tr><th style="border:1px solid" align="left">EVP_EncryptFinal</th>
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| 272 | <td style="border:1px solid" align="center"></td>
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| 273 | <td style="border:1px solid" align="center"></td>
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| 274 | <td style="border:1px solid" align="center"></td>
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| 275 | <td style="border:1px solid" align="center"></td>
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| 276 | <td style="border:1px solid" align="center"></td>
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| 277 | <td style="border:1px solid" align="center"></td>
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| 278 | <td style="border:1px solid" align="center"></td>
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| 279 | <td style="border:1px solid" align="center"></td>
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| 280 | <td style="border:1px solid" align="center">finaled<br>decryption</td>
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| 281 | <td style="border:1px solid" align="center"></td></tr>
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| 282 | <tr><th style="border:1px solid" align="left">EVP_CIPHER_CTX_free</th>
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| 283 | <td style="border:1px solid" align="center">freed</td>
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| 284 | <td style="border:1px solid" align="center">freed</td>
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| 285 | <td style="border:1px solid" align="center">freed</td>
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| 286 | <td style="border:1px solid" align="center">freed</td>
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| 287 | <td style="border:1px solid" align="center">freed</td>
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| 288 | <td style="border:1px solid" align="center">freed</td>
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| 289 | <td style="border:1px solid" align="center">freed</td>
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| 290 | <td style="border:1px solid" align="center">freed</td>
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| 291 | <td style="border:1px solid" align="center">freed</td>
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| 292 | <td style="border:1px solid" align="center"></td></tr>
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| 293 | <tr><th style="border:1px solid" align="left">EVP_CIPHER_CTX_reset</th>
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| 294 | <td style="border:1px solid" align="center"></td>
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| 295 | <td style="border:1px solid" align="center"></td>
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| 296 | <td style="border:1px solid" align="center">newed</td>
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| 297 | <td style="border:1px solid" align="center">newed</td>
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| 298 | <td style="border:1px solid" align="center">newed</td>
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| 299 | <td style="border:1px solid" align="center">newed</td>
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| 300 | <td style="border:1px solid" align="center">newed</td>
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| 301 | <td style="border:1px solid" align="center">newed</td>
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| 302 | <td style="border:1px solid" align="center">newed</td>
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| 303 | <td style="border:1px solid" align="center"></td></tr>
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| 304 | <tr><th style="border:1px solid" align="left">EVP_CIPHER_CTX_get_params</th>
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| 305 | <td style="border:1px solid" align="center"></td>
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| 306 | <td style="border:1px solid" align="center">newed</td>
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| 307 | <td style="border:1px solid" align="center">initialised</td>
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| 308 | <td style="border:1px solid" align="center">updated</td>
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| 309 | <td style="border:1px solid" align="center"></td>
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| 310 | <td style="border:1px solid" align="center">initialised<br>decryption</td>
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| 311 | <td style="border:1px solid" align="center">updated<br>decryption</td>
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| 312 | <td style="border:1px solid" align="center">initialised<br>encryption</td>
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| 313 | <td style="border:1px solid" align="center">updated<br>encryption</td>
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| 314 | <td style="border:1px solid" align="center"></td></tr>
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| 315 | <tr><th style="border:1px solid" align="left">EVP_CIPHER_CTX_set_params</th>
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| 316 | <td style="border:1px solid" align="center"></td>
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| 317 | <td style="border:1px solid" align="center">newed</td>
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| 318 | <td style="border:1px solid" align="center">initialised</td>
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| 319 | <td style="border:1px solid" align="center">updated</td>
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| 320 | <td style="border:1px solid" align="center"></td>
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| 321 | <td style="border:1px solid" align="center">initialised<br>decryption</td>
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| 322 | <td style="border:1px solid" align="center">updated<br>decryption</td>
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| 323 | <td style="border:1px solid" align="center">initialised<br>encryption</td>
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| 324 | <td style="border:1px solid" align="center">updated<br>encryption</td>
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| 325 | <td style="border:1px solid" align="center"></td></tr>
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| 326 | <tr><th style="border:1px solid" align="left">EVP_CIPHER_CTX_gettable_params</th>
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| 327 | <td style="border:1px solid" align="center"></td>
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| 328 | <td style="border:1px solid" align="center">newed</td>
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| 329 | <td style="border:1px solid" align="center">initialised</td>
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| 330 | <td style="border:1px solid" align="center">updated</td>
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| 331 | <td style="border:1px solid" align="center"></td>
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| 332 | <td style="border:1px solid" align="center">initialised<br>decryption</td>
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| 333 | <td style="border:1px solid" align="center">updated<br>decryption</td>
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| 334 | <td style="border:1px solid" align="center">initialised<br>encryption</td>
|
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| 335 | <td style="border:1px solid" align="center">updated<br>encryption</td>
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| 336 | <td style="border:1px solid" align="center"></td></tr>
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| 337 | <tr><th style="border:1px solid" align="left">EVP_CIPHER_CTX_settable_params</th>
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| 338 | <td style="border:1px solid" align="center"></td>
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| 339 | <td style="border:1px solid" align="center">newed</td>
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| 340 | <td style="border:1px solid" align="center">initialised</td>
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| 341 | <td style="border:1px solid" align="center">updated</td>
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| 342 | <td style="border:1px solid" align="center"></td>
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| 343 | <td style="border:1px solid" align="center">initialised<br>decryption</td>
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| 344 | <td style="border:1px solid" align="center">updated<br>decryption</td>
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| 345 | <td style="border:1px solid" align="center">initialised<br>encryption</td>
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| 346 | <td style="border:1px solid" align="center">updated<br>encryption</td>
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| 347 | <td style="border:1px solid" align="center"></td></tr>
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| 348 | </table>
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| 349 |
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| 350 | =end html
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| 351 |
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| 352 | =head1 NOTES
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| 353 |
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| 354 | At some point the EVP layer will begin enforcing the transitions described
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| 355 | herein.
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| 356 |
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| 357 | =head1 SEE ALSO
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| 358 |
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| 359 | L<provider-cipher(7)>, L<EVP_EncryptInit(3)>
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| 360 |
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| 361 | =head1 COPYRIGHT
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| 362 |
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| 363 | Copyright 2021 The OpenSSL Project Authors. All Rights Reserved.
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| 364 |
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| 365 | Licensed under the Apache License 2.0 (the "License"). You may not use
|
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| 366 | this file except in compliance with the License. You can obtain a copy
|
|---|
| 367 | in the file LICENSE in the source distribution or at
|
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| 368 | L<https://www.openssl.org/source/license.html>.
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| 369 |
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| 370 | =cut
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