PaymentCryptographyDataPlane / Client / verify_mac

verify_mac#

PaymentCryptographyDataPlane.Client.verify_mac(**kwargs)#

Verifies a Message Authentication Code (MAC).

You can use this operation when keys won’t be shared but mutual data is present on both ends for validation. In this case, known data values are used to generate a MAC on both ends for verification without sending or receiving data in ciphertext or plaintext. You can use this operation to verify a DUPKT, HMAC or EMV MAC by setting generation attributes and algorithm to the associated values. Use the same encryption key for MAC verification as you use for GenerateMac.

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:

GenerateMac

Request Syntax

response = client.verify_mac(
    KeyIdentifier='string',
    Mac='string',
    MacLength=123,
    MessageData='string',
    VerificationAttributes={
        'Algorithm': 'ISO9797_ALGORITHM1'|'ISO9797_ALGORITHM3'|'CMAC'|'HMAC_SHA224'|'HMAC_SHA256'|'HMAC_SHA384'|'HMAC_SHA512',
        'DukptCmac': {
            'DukptDerivationType': 'TDES_2KEY'|'TDES_3KEY'|'AES_128'|'AES_192'|'AES_256',
            'DukptKeyVariant': 'BIDIRECTIONAL'|'REQUEST'|'RESPONSE',
            'KeySerialNumber': 'string'
        },
        'DukptIso9797Algorithm1': {
            'DukptDerivationType': 'TDES_2KEY'|'TDES_3KEY'|'AES_128'|'AES_192'|'AES_256',
            'DukptKeyVariant': 'BIDIRECTIONAL'|'REQUEST'|'RESPONSE',
            'KeySerialNumber': 'string'
        },
        'DukptIso9797Algorithm3': {
            'DukptDerivationType': 'TDES_2KEY'|'TDES_3KEY'|'AES_128'|'AES_192'|'AES_256',
            'DukptKeyVariant': 'BIDIRECTIONAL'|'REQUEST'|'RESPONSE',
            'KeySerialNumber': 'string'
        },
        'EmvMac': {
            'MajorKeyDerivationMode': 'EMV_OPTION_A'|'EMV_OPTION_B',
            'PanSequenceNumber': 'string',
            'PrimaryAccountNumber': 'string',
            'SessionKeyDerivationMode': 'EMV_COMMON_SESSION_KEY'|'EMV2000'|'AMEX'|'MASTERCARD_SESSION_KEY'|'VISA',
            'SessionKeyDerivationValue': {
                'ApplicationCryptogram': 'string',
                'ApplicationTransactionCounter': 'string'
            }
        }
    }
)

Parameters:

KeyIdentifier (string) –
[REQUIRED]

The keyARN of the encryption key that Amazon Web Services Payment Cryptography uses to verify MAC data.
Mac (string) –
[REQUIRED]

The MAC being verified.
MacLength (integer) – The length of the MAC.
MessageData (string) –
[REQUIRED]

The data on for which MAC is under verification.
VerificationAttributes (dict) –
[REQUIRED]

The attributes and data values to use for MAC verification within Amazon Web Services Payment Cryptography.

Note
This is a Tagged Union structure. Only one of the following top level keys can be set: Algorithm, DukptCmac, DukptIso9797Algorithm1, DukptIso9797Algorithm3, EmvMac.
- Algorithm (string) –
  
  The encryption algorithm for MAC generation or verification.
- DukptCmac (dict) –
  
  Parameters that are required for MAC generation or verification using DUKPT CMAC algorithm.
  - DukptDerivationType (string) –
    
    The key type derived 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) – [REQUIRED]
    
    The type of use of DUKPT, which can be MAC generation, MAC verification, or both.
  - 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.
- DukptIso9797Algorithm1 (dict) –
  
  Parameters that are required for MAC generation or verification using DUKPT ISO 9797 algorithm1.
  - DukptDerivationType (string) –
    
    The key type derived 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) – [REQUIRED]
    
    The type of use of DUKPT, which can be MAC generation, MAC verification, or both.
  - 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.
- DukptIso9797Algorithm3 (dict) –
  
  Parameters that are required for MAC generation or verification using DUKPT ISO 9797 algorithm2.
  - DukptDerivationType (string) –
    
    The key type derived 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) – [REQUIRED]
    
    The type of use of DUKPT, which can be MAC generation, MAC verification, or both.
  - 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.
- EmvMac (dict) –
  
  Parameters that are required for MAC generation or verification using EMV MAC algorithm.
  - MajorKeyDerivationMode (string) – [REQUIRED]
    
    The method to use when deriving the master key for EMV MAC generation or verification.
  - 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.
  - SessionKeyDerivationMode (string) – [REQUIRED]
    
    The method of deriving a session key for EMV MAC generation or verification.
  - SessionKeyDerivationValue (dict) – [REQUIRED]
    
    Parameters that are required to generate session key for EMV generation and verification.
    
    Note
    This is a Tagged Union structure. Only one of the following top level keys can be set: ApplicationCryptogram, ApplicationTransactionCounter.
    - ApplicationCryptogram (string) –
      
      The cryptogram provided by the terminal during transaction processing.
    - ApplicationTransactionCounter (string) –
      
      The transaction counter that is provided by the terminal during transaction processing.

Return type:

dict

Returns:

Response Syntax

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

Response Structure

(dict) –
- KeyArn (string) –
  
  The keyARN of the encryption key that Amazon Web Services Payment Cryptography uses for MAC verification.
- 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 calculates the KCV by using standard algorithms, typically by encrypting 8 or 16 bytes or “00” or “01” and then truncating the result to the first 3 bytes, or 6 hex digits, of the resulting cryptogram.

Exceptions

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