Package javacard.security
Interface ECPublicKey
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public interface ECPublicKey extends PublicKey, ECKey
TheECPublicKey
interface is used to verify signatures on signed data using the ECDSA algorithm and to generate shared secrets using the ECDH algorithm. An implementation ofECPublicKey
interface must also implement theECKey
interface methods.When all components of the key (W, A, B, G, R, Field) are set, the key is initialized and ready for use.
The notation used to describe parameters specific to the EC algorithm is based on the naming conventions established in [IEEE P1363].
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description short
getW(byte[] buffer, short offset)
Returns the point of the curve comprising the public key in plain text form.void
setW(byte[] buffer, short offset, short length)
Sets the point of the curve comprising the public key.-
Methods inherited from interface javacard.security.ECKey
copyDomainParametersFrom, getA, getB, getField, getG, getK, getR, setA, setB, setFieldF2M, setFieldF2M, setFieldFP, setG, setK, setR
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Methods inherited from interface javacard.security.Key
clearKey, getSize, getType, isInitialized
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Method Detail
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setW
void setW(byte[] buffer, short offset, short length) throws CryptoException
Sets the point of the curve comprising the public key. The point should be specified as an octet string as per ANSI X9.62. A specific implementation need not support the compressed form, but must support the uncompressed form of the point. The plain text data format is big-endian and right-aligned (the least significant bit is the least significant bit of last byte). Input parameter data is copied into the internal representation.Note:
- If the key object implements the
javacardx.crypto.KeyEncryption
interface and theCipher
object specified viasetKeyCipher()
is notnull
, the key value is decrypted using theCipher
object.
- Parameters:
buffer
- the input bufferoffset
- the offset into the input buffer at which the point specification beginslength
- the byte length of the point specification- Throws:
CryptoException
- with the following reason code:CryptoException.ILLEGAL_VALUE
if the length parameter is 0 or invalid or the input parameter data format is incorrect, or if the input parameter data is inconsistent with the key length, or if input data decryption is required and fails.
- If the key object implements the
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getW
short getW(byte[] buffer, short offset) throws CryptoException
Returns the point of the curve comprising the public key in plain text form. The point is represented as an octet string in compressed or uncompressed forms as per ANSI X9.62. The data format is big-endian and right-aligned (the least significant bit is the least significant bit of last byte).- Parameters:
buffer
- the output bufferoffset
- the offset into the output buffer at which the point specification data is to begin- Returns:
- the byte length of the point specification
- Throws:
CryptoException
- with the following reason code:CryptoException.UNINITIALIZED_KEY
if the point of the curve comprising the public key has not been successfully initialized since the time the initialized state of the key was set to false.
- See Also:
Key
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