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# Module cipher Methods

## AcquireAESInfo

AcquireAESInfo() allocate the AESInfo structure.

The format of the AcquireAESInfo method is:

      AESInfo *AcquireAESInfo(void)

## DestroyAESInfo

DestroyAESInfo() zeros memory associated with the AESInfo structure.

The format of the DestroyAESInfo method is:

      AESInfo *DestroyAESInfo(AESInfo *aes_info)

A description of each parameter follows:

##### aes_info

the cipher context.

## EncipherAESBlock

EncipherAESBlock() enciphers a single block of plaintext to produce a block of ciphertext.

The format of the EncipherAESBlock method is:

      void EncipherAES(AESInfo *aes_info,const unsigned char *plaintext,
        unsigned char *ciphertext)

A description of each parameter follows:

##### aes_info

the cipher context.

##### plaintext

the plain text.

##### ciphertext

the cipher text.

## PasskeyDecipherImage

PasskeyDecipherImage() converts cipher pixels to plain pixels.

The format of the PasskeyDecipherImage method is:

      MagickBooleanType PasskeyDecipherImage(Image *image,
        const StringInfo *passkey,ExceptionInfo *exception)
      MagickBooleanType DecipherImage(Image *image,const char *passphrase,
        ExceptionInfo *exception)

A description of each parameter follows:

##### image

the image.

##### passphrase

decipher cipher pixels with this passphrase.

##### passkey

decrypt cipher pixels with this passkey.

##### exception

return any errors or warnings in this structure.

## PasskeyEncipherImage

PasskeyEncipherImage() converts pixels to cipher-pixels.

The format of the PasskeyEncipherImage method is:

      MagickBooleanType PasskeyEncipherImage(Image *image,
        const StringInfo *passkey,ExceptionInfo *exception)
      MagickBooleanType EncipherImage(Image *image,const char *passphrase,
        ExceptionInfo *exception)

A description of each parameter follows:

##### image

the image.

##### passphrase

encipher pixels with this passphrase.

##### passkey

decrypt cipher pixels with this passkey.

##### exception

return any errors or warnings in this structure.

## SetAESKey

SetAESKey() sets the key for the AES cipher. The key length is specified in bits. Valid values are 128, 192, or 256 requiring a key buffer length in bytes of 16, 24, and 32 respectively.

The format of the SetAESKey method is:

      SetAESKey(AESInfo *aes_info,const StringInfo *key)

A description of each parameter follows:

##### aes_info

the cipher context.

##### key

the key.

## PasskeyDecipherImage

PasskeyDecipherImage() converts cipher pixels to plain pixels.

The format of the PasskeyDecipherImage method is:

      MagickBooleanType PasskeyDecipherImage(Image *image,
        const StringInfo *passkey,ExceptionInfo *exception)
      MagickBooleanType DecipherImage(Image *image,const char *passphrase,
        ExceptionInfo *exception)

A description of each parameter follows:

##### image

the image.

##### passphrase

decipher cipher pixels with this passphrase.

##### passkey

decrypt cipher pixels with this passkey.

##### exception

return any errors or warnings in this structure.

## PasskeyEncipherImage

PasskeyEncipherImage() converts pixels to cipher-pixels.

The format of the PasskeyEncipherImage method is:

      MagickBooleanType PasskeyEncipherImage(Image *image,
        const StringInfo *passkey,ExceptionInfo *exception)
      MagickBooleanType EncipherImage(Image *image,const char *passphrase,
        ExceptionInfo *exception)

A description of each parameter follows:

##### passphrase

decipher cipher pixels with this passphrase.

##### passkey

decrypt cipher pixels with this passkey.

##### exception

return any errors or warnings in this structure.

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