PaymentCryptographyDataPlane / Client / decrypt_data

decrypt_data#

PaymentCryptographyDataPlane.Client.decrypt_data(**kwargs)#

Decrypts ciphertext data to plaintext using a symmetric (TDES, AES), asymmetric (RSA), or derived (DUKPT or EMV) encryption key scheme. For more information, see Decrypt data in the Amazon Web Services Payment Cryptography User Guide.

You can use an encryption key generated within Amazon Web Services Payment Cryptography, or you can import your own encryption key by calling ImportKey. For this operation, the key must have KeyModesOfUse set to Decrypt. In asymmetric decryption, Amazon Web Services Payment Cryptography decrypts the ciphertext using the private component of the asymmetric encryption key pair. For data encryption outside of Amazon Web Services Payment Cryptography, you can export the public component of the asymmetric key pair by calling GetPublicCertificate.

For symmetric and DUKPT decryption, Amazon Web Services Payment Cryptography supports TDES and AES algorithms. For EMV decryption, Amazon Web Services Payment Cryptography supports TDES algorithms. For asymmetric decryption, Amazon Web Services Payment Cryptography supports RSA.

When you use TDES or TDES DUKPT, the ciphertext data length must be a multiple of 8 bytes. For AES or AES DUKPT, the ciphertext data length must be a multiple of 16 bytes. For RSA, it sould be equal to the key size unless padding is enabled.

For information about valid keys for this operation, see Understanding key attributes and Key types for specific data operations in the Amazon Web Services Payment Cryptography User Guide.

Cross-account use: This operation can’t be used across different Amazon Web Services accounts.

Related operations:

Request Syntax

response = client.decrypt_data(
    CipherText='string',
    DecryptionAttributes={
        'Asymmetric': {
            'PaddingType': 'PKCS1'|'OAEP_SHA1'|'OAEP_SHA256'|'OAEP_SHA512'
        },
        'Dukpt': {
            'DukptKeyDerivationType': 'TDES_2KEY'|'TDES_3KEY'|'AES_128'|'AES_192'|'AES_256',
            'DukptKeyVariant': 'BIDIRECTIONAL'|'REQUEST'|'RESPONSE',
            'InitializationVector': 'string',
            'KeySerialNumber': 'string',
            'Mode': 'ECB'|'CBC'
        },
        'Emv': {
            'InitializationVector': 'string',
            'MajorKeyDerivationMode': 'EMV_OPTION_A'|'EMV_OPTION_B',
            'Mode': 'ECB'|'CBC',
            'PanSequenceNumber': 'string',
            'PrimaryAccountNumber': 'string',
            'SessionDerivationData': 'string'
        },
        'Symmetric': {
            'InitializationVector': 'string',
            'Mode': 'ECB'|'CBC'|'CFB'|'CFB1'|'CFB8'|'CFB64'|'CFB128'|'OFB',
            'PaddingType': 'PKCS1'|'OAEP_SHA1'|'OAEP_SHA256'|'OAEP_SHA512'
        }
    },
    KeyIdentifier='string'
)

Parameters:

CipherText (string) –
[REQUIRED]

The ciphertext to decrypt.
DecryptionAttributes (dict) –
[REQUIRED]

The encryption key type and attributes for ciphertext decryption.

Note
This is a Tagged Union structure. Only one of the following top level keys can be set: Asymmetric, Dukpt, Emv, Symmetric.
- Asymmetric (dict) –
  
  Parameters for plaintext encryption using asymmetric keys.
  - PaddingType (string) –
    
    The padding to be included with the data.
- Dukpt (dict) –
  
  Parameters that are required to encrypt plaintext data using DUKPT.
  - DukptKeyDerivationType (string) –
    
    The key type encrypted using DUKPT from a Base Derivation Key (BDK) and Key Serial Number (KSN). This must be less than or equal to the strength of the BDK. For example, you can’t use AES_128 as a derivation type for a BDK of AES_128 or TDES_2KEY
  - DukptKeyVariant (string) –
    
    The type of use of DUKPT, which can be incoming data decryption, outgoing data encryption, or both.
  - InitializationVector (string) –
    
    An input used to provide the intial state. If no value is provided, Amazon Web Services Payment Cryptography defaults it to zero.
  - KeySerialNumber (string) – [REQUIRED]
    
    The unique identifier known as Key Serial Number (KSN) that comes from an encrypting device using DUKPT encryption method. The KSN is derived from the encrypting device unique identifier and an internal transaction counter.
  - Mode (string) –
    
    The block cipher method to use for encryption.
    
    The default is CBC.
- Emv (dict) –
  
  Parameters for plaintext encryption using EMV keys.
  - InitializationVector (string) –
    
    An input used to provide the intial state. If no value is provided, Amazon Web Services Payment Cryptography defaults it to zero.
  - MajorKeyDerivationMode (string) – [REQUIRED]
    
    The EMV derivation mode to use for ICC master key derivation as per EMV version 4.3 book 2.
  - Mode (string) –
    
    The block cipher method to use for encryption.
  - PanSequenceNumber (string) – [REQUIRED]
    
    A number that identifies and differentiates payment cards with the same Primary Account Number (PAN).
  - PrimaryAccountNumber (string) – [REQUIRED]
    
    The Primary Account Number (PAN), a unique identifier for a payment credit or debit card and associates the card to a specific account holder.
  - SessionDerivationData (string) – [REQUIRED]
    
    The derivation value used to derive the ICC session key. It is typically the application transaction counter value padded with zeros or previous ARQC value padded with zeros as per EMV version 4.3 book 2.
- Symmetric (dict) –
  
  Parameters that are required to perform encryption and decryption using symmetric keys.
  - InitializationVector (string) –
    
    An input used to provide the intial state. If no value is provided, Amazon Web Services Payment Cryptography defaults it to zero.
  - Mode (string) – [REQUIRED]
    
    The block cipher method to use for encryption.
  - PaddingType (string) –
    
    The padding to be included with the data.
KeyIdentifier (string) –
[REQUIRED]

The keyARN of the encryption key that Amazon Web Services Payment Cryptography uses for ciphertext decryption.

Return type:

dict

Returns:

Response Syntax

{
    'KeyArn': 'string',
    'KeyCheckValue': 'string',
    'PlainText': 'string'
}

Response Structure

(dict) –
- KeyArn (string) –
  
  The keyARN of the encryption key that Amazon Web Services Payment Cryptography uses for ciphertext decryption.
- KeyCheckValue (string) –
  
  The key check value (KCV) of the encryption key. The KCV is used to check if all parties holding a given key have the same key or to detect that a key has changed.
  
  Amazon Web Services Payment Cryptography computes the KCV according to the CMAC specification.
- PlainText (string) –
  
  The decrypted plaintext data in hexBinary format.

Exceptions

PaymentCryptographyDataPlane.Client.exceptions.ValidationException
PaymentCryptographyDataPlane.Client.exceptions.AccessDeniedException
PaymentCryptographyDataPlane.Client.exceptions.ResourceNotFoundException
PaymentCryptographyDataPlane.Client.exceptions.ThrottlingException
PaymentCryptographyDataPlane.Client.exceptions.InternalServerException