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      1 digraph cipher {
      2     bgcolor="transparent";
      3 
      4     begin [label=start, color="#deeaee", style="filled"];
      5     newed [fontcolor="#c94c4c", style="solid"];
      6 
      7     initialised [fontcolor="#c94c4c"];
      8     updated [fontcolor="#c94c4c"];
      9     finaled [fontcolor="#c94c4c"];
     10     end [label="freed", color="#deeaee", style="filled"];
     11 
     12     d_initialised [label="initialised\n(decryption)", fontcolor="#c94c4c"];
     13     d_updated [label="updated\n(decryption)", fontcolor="#c94c4c"];
     14     e_initialised [label="initialised\n(encryption)", fontcolor="#c94c4c"];
     15     e_updated [label="updated\n(encryption)", fontcolor="#c94c4c"];
     16 
     17     begin -> newed [label="EVP_CIPHER_CTX_new"];
     18     newed -> initialised [label="EVP_CipherInit"];
     19     initialised -> initialised [label="EVP_CipherInit\n(not required but allowed)",
     20                                 style=dashed];
     21     initialised -> updated [label="EVP_CipherUpdate", weight=2];
     22     updated -> updated [label="EVP_CipherUpdate"];
     23     updated -> finaled [label="EVP_CipherFinal"];
     24     finaled -> finaled [label="EVP_CIPHER_CTX_get_params\n(AEAD encryption)",
     25                         style=dashed];
     26     finaled -> end [label="EVP_CIPHER_CTX_free"];
     27     newed -> d_initialised [label="EVP_DecryptInit"];
     28     d_initialised -> d_initialised [label="EVP_DecryptInit\n(not required but allowed)",
     29                                 style=dashed];
     30     d_initialised -> d_updated [label="EVP_DecryptUpdate", weight=2];
     31     d_updated -> d_updated [label="EVP_DecryptUpdate"];
     32     d_updated -> finaled [label="EVP_DecryptFinal"];
     33     newed -> e_initialised [label="EVP_EncryptInit"];
     34     e_initialised -> e_initialised [label="EVP_EncryptInit\n(not required but allowed)",
     35                                 style=dashed];
     36     e_initialised -> e_updated [label="EVP_EncryptUpdate", weight=2];
     37     e_updated -> e_updated [label="EVP_EncryptUpdate"];
     38     e_updated -> finaled [label="EVP_EncryptFinal"];
     39     most -> newed [label="EVP_CIPHER_CTX_reset", style=dashed,
     40                       color="#034f84", fontcolor="#034f84"];
     41     most [label="any of the initialised\nupdated or finaled states", style=dashed,
     42                       color="#034f84", fontcolor="#034f84"];
     43 }
     44 
     45 /* This is a version with a single flavour which is easier to comprehend
     46 digraph cipher {
     47     bgcolor="transparent";
     48 
     49     begin [label=start, color="#deeaee", style="filled"];
     50     newed [fontcolor="#c94c4c", style="solid"];
     51     initialised [fontcolor="#c94c4c"];
     52     updated [fontcolor="#c94c4c"];
     53     finaled [fontcolor="#c94c4c"];
     54     end [label="freed", color="#deeaee", style="filled"];
     55 
     56     begin -> newed [label="EVP_CIPHER_CTX_new"];
     57     newed -> initialised [label="EVP_CipherInit"];
     58     initialised -> initialised [label="EVP_CipherInit\n(not required but allowed)",
     59                                 style=dashed];
     60     initialised -> updated [label="EVP_CipherUpdate", weight=2];
     61     updated -> updated [label="EVP_CipherUpdate"];
     62     updated -> finaled [label="EVP_CipherFinal"];
     63     finaled -> finaled [label="EVP_CIPHER_CTX_get_params\n(AEAD encryption)",
     64                         style=dashed];
     65     finaled -> end [label="EVP_CIPHER_CTX_free"];
     66     finaled -> newed [label="EVP_CIPHER_CTX_reset", style=dashed,
     67                       color="#034f84", fontcolor="#034f84"];
     68     updated -> newed [label="EVP_CIPHER_CTX_reset", style=dashed,
     69                       color="#034f84", fontcolor="#034f84"];
     70 }
     71 */
     72 
     73