36 lines
1.3 KiB
TypeScript
36 lines
1.3 KiB
TypeScript
/**
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* Package constant-time provides functions for performing algorithmically constant-time operations.
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*/
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/**
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* NOTE! Due to the inability to guarantee real constant time evaluation of
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* anything in JavaScript VM, this is module is the best effort.
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*/
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/**
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* Returns resultIfOne if subject is 1, or resultIfZero if subject is 0.
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*
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* Supports only 32-bit integers, so resultIfOne or resultIfZero are not
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* integers, they'll be converted to them with bitwise operations.
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*/
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export declare function select(subject: number, resultIfOne: number, resultIfZero: number): number;
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/**
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* Returns 1 if a <= b, or 0 if not.
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* Arguments must be positive 32-bit integers less than or equal to 2^31 - 1.
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*/
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export declare function lessOrEqual(a: number, b: number): number;
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/**
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* Returns 1 if a and b are of equal length and their contents
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* are equal, or 0 otherwise.
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*
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* Note that unlike in equal(), zero-length inputs are considered
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* the same, so this function will return 1.
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*/
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export declare function compare(a: Uint8Array, b: Uint8Array): number;
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/**
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* Returns true if a and b are of equal non-zero length,
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* and their contents are equal, or false otherwise.
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*
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* Note that unlike in compare() zero-length inputs are considered
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* _not_ equal, so this function will return false.
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*/
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export declare function equal(a: Uint8Array, b: Uint8Array): boolean;
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