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Added in API level 1

Summary: Methods

RSAKey

public interface RSAKey

java.security.interfaces.RSAKey

Known indirect subclasses

RSAMultiPrimePrivateCrtKey, RSAPrivateCrtKey, RSAPrivateKey, RSAPublicKey

RSAMultiPrimePrivateCrtKey	The interface to an RSA multi-prime private key, as defined in the PKCS#1 v2.2 standard, using the Chinese Remainder Theorem (CRT) information values.
RSAPrivateCrtKey	The interface to an RSA private key, as defined in the PKCS#1 v2.2 standard, using the Chinese Remainder Theorem (CRT) information values.
RSAPrivateKey	The interface to an RSA private key.
RSAPublicKey	The interface to an RSA public key.

The interface to a public or private key in PKCS#1 v2.2 standard, such as those for RSA, or RSASSA-PSS algorithms.

See also:

RSAPublicKey
RSAPrivateKey

Summary

Public methods
`abstract BigInteger`	`getModulus()` Returns the modulus.
`default AlgorithmParameterSpec`	`getParams()` Returns the parameters associated with this key.

Public methods

getModulus

Added in API level 1

public abstract BigInteger getModulus ()

Returns the modulus.

Returns
`BigInteger`	the modulus

getParams

Added in API level 35

public AlgorithmParameterSpec getParams ()

Returns the parameters associated with this key. The parameters are optional and may be either explicitly specified or implicitly created during key pair generation.

Implementation Requirements:

The default implementation returns null.

Returns
`AlgorithmParameterSpec`	the associated parameters, may be null

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Last updated 2026-08-03 UTC.

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