getModulusLengthFromRsaDer

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getModulusLengthFromRsaDer(derKey): number

Extracts the modulus length in bits from a DER-encoded RSA key

Parameters

derKey

ArrayBuffer

The DER-encoded RSA key as ArrayBuffer

Returns

number

The modulus length in bits (e.g., 2048 for RSA-2048)

Last updated: Sep 30, 2025