crypto: share WebCrypto method and usage helpers#63975
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Introduce prepareSubtleMethod() and convertSubtleArgument() for the common SubtleCrypto call prelude. Methods now reuse the same receiver check, required-argument check, error prefix construction, argument context selection, and WebIDL conversion path. Introduce WebCrypto key usage helpers for common usage validation and key pair usage splitting. Algorithm modules now define their allowed public, private, and key generation usages once, then call the shared helpers from generateKey() and importKey() paths. This removes repeated function-invocation setup in webcrypto.js and repeated key usage checks across the WebCrypto algorithm modules while preserving the existing validation behavior. Mark normalized-algorithm fallback branches as unreachable assertions. Signed-off-by: Filip Skokan <panva.ip@gmail.com>
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This is a cleanup of a large number of repeated patterns spread across webcrypto methods and algorithm operation implementations.
Introduce prepareSubtleMethod() and convertSubtleArgument() for the common SubtleCrypto call prelude. Methods now reuse the same receiver check, required-argument check, error prefix construction, argument context selection, and WebIDL conversion path.
Introduce WebCrypto key usage helpers for common usage validation and key pair usage splitting. Algorithm modules now define their allowed public, private, and key generation usages once, then call the shared helpers from generateKey() and importKey() paths.
This removes repeated function-invocation setup in webcrypto.js and repeated key usage checks across the WebCrypto algorithm modules while preserving the existing validation behavior.
Mark normalized-algorithm fallback branches as unreachable assertions.