Initialization and deinitialization functions
[CRYP Exported Functions]

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              ##### Initialization and deinitialization functions #####
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    [..]  This section provides functions allowing to:
      (+) Initialize the CRYP according to the specified parameters 
          in the CRYP_InitTypeDef and creates the associated handle
      (+) DeInitialize the CRYP peripheral
      (+) Initialize the CRYP MSP (MCU Specific Package)
      (+) De-Initialize the CRYP MSP
      
    [..]
    (@) Specific care must be taken to format the key and the Initialization Vector IV!
    
   [..] If the key is defined as a 128-bit long array key[127..0] = {b127 ... b0} where 
        b127 is the MSB and b0 the LSB, the key must be stored in MCU memory 
        (+) as a sequence of words where the MSB word comes first (occupies the
          lowest memory address) 
        (+) where each word is byte-swapped:
         (++)   address n+0 : 0b b103 .. b96 b111 .. b104 b119 .. b112 b127 .. b120
         (++)   address n+4 : 0b b71 .. b64 b79 .. b72 b87 .. b80 b95 .. b88
         (++)   address n+8 : 0b b39 .. b32 b47 .. b40 b55 .. b48 b63 .. b56
         (++)   address n+C : 0b b7 .. b0 b15 .. b8 b23 .. b16 b31 .. b24                 
    [..] Hereafter, another illustration when considering a 128-bit long key made of 16 bytes {B15..B0}.
        The 4 32-bit words that make the key must be stored as follows in MCU memory:  
         (+)    address n+0 : 0x B12 B13 B14 B15
         (+)    address n+4 : 0x B8 B9 B10 B11
         (+)    address n+8 : 0x B4 B5 B6 B7
         (+)    address n+C : 0x B0 B1 B2 B3  
    [..]  which leads to the expected setting  
      (+)       AES_KEYR3 = 0x B15 B14 B13 B12   
      (+)       AES_KEYR2 = 0x B11 B10 B9 B8      
      (+)       AES_KEYR1 = 0x B7 B6 B5 B4        
      (+)       AES_KEYR0 = 0x B3 B2 B1 B0      
   
   [..]  Same format must be applied for a 256-bit long key made of 32 bytes {B31..B0}. 
         The 8 32-bit words that make the key must be stored as follows in MCU memory:
         (+)    address n+00 : 0x B28 B29 B30 B31
         (+)    address n+04 : 0x B24 B25 B26 B27
         (+)    address n+08 : 0x B20 B21 B22 B23
         (+)    address n+0C : 0x B16 B17 B18 B19            
         (+)    address n+10 : 0x B12 B13 B14 B15
         (+)    address n+14 : 0x B8 B9 B10 B11
         (+)    address n+18 : 0x B4 B5 B6 B7
         (+)    address n+1C : 0x B0 B1 B2 B3 
    [..]  which leads to the expected setting 
      (+)       AES_KEYR7 = 0x B31 B30 B29 B28   
      (+)       AES_KEYR6 = 0x B27 B26 B25 B24      
      (+)       AES_KEYR5 = 0x B23 B22 B21 B20        
      (+)       AES_KEYR4 = 0x B19 B18 B17 B16       
      (+)       AES_KEYR3 = 0x B15 B14 B13 B12   
      (+)       AES_KEYR2 = 0x B11 B10 B9 B8      
      (+)       AES_KEYR1 = 0x B7 B6 B5 B4        
      (+)       AES_KEYR0 = 0x B3 B2 B1 B0           
   
   [..] Initialization Vector IV (4 32-bit words) format must follow the same as 
        that of a 128-bit long key.   
  
  [..]