Blowfish class

class crsysapi.Blowfish

Blowfish cipher algorithm (Schneier, 1993).

static decrypt_block(data, key, modestr='ECB', iv=None)

Decrypt a block of data. Must be an exact multiple of 8 bytes.

Parameters:

  • data (bytes) -- Input data to be decrypted

  • key (bytes) -- Key of length between 1 and 56 bytes (448 bits)

  • modestr (str) -- Cipher mode {"[ECB]"|"CBC"|"CFB"|"OFB"|"CTR"}

  • iv (bytes) -- Initialization Vector (IV) of exactly 8 bytes or None for ECB mode

Returns:

Plaintext in byte array or empty array on error. Output is always the same length as the input.

Return type:

bytes

static encrypt_block(data, key, modestr='ECB', iv=None)

Encrypt a block of data. Must be an exact multiple of 8 bytes.

Parameters:

  • data (bytes) -- Input data to be encrypted

  • key (bytes) -- Key of length between 1 and 56 bytes (448 bits)

  • modestr (str) -- Cipher mode {"[ECB]"|"CBC"|"CFB"|"OFB"|"CTR"}

  • iv (bytes) -- Initialization Vector (IV) of exactly 8 bytes or None for ECB mode

Returns:

Ciphertext in byte array or empty array on error. Output is always the same length as the input.

Return type:

bytes