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Main step of GOST 28147-89: Difference between revisions
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{{task|Encryption}}
[[wp:GOST (block cipher)|GOST 28147-89]] is a standard symmetric encryption based on a [[wp:Feistel cipher|Feistel network]]. Structure of the algorithm consists of three levels:▼
▲[[wp:GOST (block cipher)|GOST 28147-89]] is a standard symmetric encryption based on a [[wp:Feistel cipher|Feistel network]].
# encryption modes - simple replacement, application range, imposing a range of feedback and authentication code generation;▼
# cycles - 32-З, 32-Р and 16-З, is a repetition of the main step;▼
# ''main step'', a function that takes a 64-bit block of text and one of the eight 32-bit encryption key elements, and uses the replacement table (8x16 matrix of 4-bit values), and returns encrypted block.▼
The structure of the algorithm consists of three levels:
▲# encryption modes - simple replacement, application range, imposing a range of feedback and authentication code generation;
▲# cycles - 32-З, 32-Р and 16-З, is a repetition of the main step;
▲# ''main step'', a function that takes a 64-bit block of text and one of the eight 32-bit encryption key elements, and uses the replacement table (8x16 matrix of 4-bit values), and returns encrypted block.
;Task:
Implement the main step of this encryption algorithm.
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=={{header|BBC BASIC}}==
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