<modifyVerifier> (Modification Verifier)

Specifies that a cryptographic algorithm which was not defined by this Office Open XML Standard has been used to generate the hash value stored with this document.

This value, when present, shall be interpreted based on the value of the <algIdExtSource> attribute in order to determine the algorithm used, which shall be application-defined. [: This extensibility affords the fact that with exponentially increasing computing power, documents created in the future will likely need to utilize as yet undefined hashing algorithms in order to remain secure. ]

If this value is present, the <cryptAlgorithmClass, cryptAlgorithmType>, and <cryptAlgorithmSid> attribute values shall be ignored in favor of the algorithm defined by this attribute.

<p:… p:algIdExt="0000000A" 
  p:algIdExtSource="futureCryptography"
  p:hashData="9oN7nWkCAyEZib1RomSJTjmPpCY=" />

The @algIdExt attribute value of 0000000A specifies that the algorithm with hex code A shall be used as defined by the futureCryptography application. ]

The possible values for this attribute are defined by the XML Schema unsignedInt datatype.

Specifies the application which defined the algorithm value specified by the <algIdExt> attribute.

<p:… p:algIdExt="0000000A" 
  p:algIdExtSource="futureCryptography"
  p:hashData="9oN7nWkCAyEZib1RomSJTjmPpCY=" />

The @algIdExtSource attribute value of futureCryptography specifies that the algorithm used here was published by the futureCryptography application. ]

The possible values for this attribute are defined by the XML Schema string datatype.

Specifies the class of cryptographic algorithm used by this protection. [: The initial version of this Office Open XML Standard only supports a single version - hash - but future versions may expand this as necessary. ]

<p:… p:cryptAlgorithmClass="hash" 
  p:cryptAlgorithmType="typeAny" 
  p:cryptAlgorithmSid="1"
  p:hashData="9oN7nWkCAyEZib1RomSJTjmPpCY=" />

The @cryptAlgorithmClass attribute value of hash specifies that the algorithm used for the password is a hashing algorithm. ]

The possible values for this attribute are defined by the ST_AlgClass simple type (§4.8.1).

Specifies the specific cryptographic hashing algorithm which shall be used along with the @saltData attribute and user-supplied password in order to compute a hash value for comparison.

The possible values for this attribute shall be interpreted as follows:

<p:… p:cryptAlgorithmClass="hash" 
  p:cryptAlgorithmType="typeAny" 
  p:cryptAlgorithmSid="1"
  p:hashData="9oN7nWkCAyEZib1RomSJTjmPpCY=" />

The @cryptAlgorithmSid attribute value of 1 specifies that the SHA-1 hashing algorithm shall be used to generate a hash from the user-defined password. ]

The possible values for this attribute are defined by the XML Schema unsignedInt datatype.

Specifies the type of cryptographic algorithm used by this protection. [: The initial version of this Office Open XML Standard only supports a single type - typeAny - but future versions may expand this as necessary. ]

<p:… p:cryptAlgorithmClass="hash" 
  p:cryptAlgorithmType="typeAny" 
  p:cryptAlgorithmSid="1"
  p:hashData="9oN7nWkCAyEZib1RomSJTjmPpCY=" />

The @cryptAlgorithmType attribute value of typeAny specifies that any type of algorithm may have been used for the password. ]

The possible values for this attribute are defined by the ST_AlgType simple type (§4.8.2).

Specifies the cryptographic provider which was used to generate the hash value stored in this document. If the user provided a cryptographic provider which was not the system's built-in provider, then that provider shall be stored here so it can subsequently be used if available.

If this attribute is omitted, then the built-in cryptographic provider on the system shall be used.

<p:… p:cryptProvider="Krista'sProvider"
  p:hashData="9oN7nWkCAyEZib1RomSJTjmPpCY=" />

The @cryptProvider attribute value of Krista'sProvider specifies that the cryptographic provider with name "Krista's Provider" shall be used if available. ]

The possible values for this attribute are defined by the XML Schema string datatype.

Specifies the type of cryptographic provider to be used.

<p:… p:cryptProviderType="rsaAES"
  p:hashData="9oN7nWkCAyEZib1RomSJTjmPpCY=" />

The @cryptProviderType attribute value of rsaAES specifies that the cryptographic provider type shall be an Advanced Encryption Standard provider. ]

The possible values for this attribute are defined by the ST_CryptProv simple type (§4.8.4).

Specifies that a cryptographic provider type which was not defined by this Office Open XML Standard has been used to generate the hash value stored with this document.

This value, when present, shall be interpreted based on the value of the <cryptProviderTypeExtSource> attribute in order to determine the provider type used, which shall be application-defined. [: This extensibility affords the fact that with exponentially increasing computing power, documents created in the future will likely need to utilize as yet undefined cryptographic provider types in order to remain secure. ]

If this value is present, the <cryptProviderType> attribute value shall be ignored in favor of the provider type defined by this attribute.

<p:… p:cryptProviderTypeExt="00A5691D" 
  p:cryptProvideTypeExtSource="futureCryptography"
  p:hashData="9oN7nWkCAyEZib1RomSJTjmPpCY=" />

The @cryptProviderTypeExt attribute value of 00A5691D specifies that the provider type associated with hex code A5691D shall be used as defined by the futureCryptography application. ]

The possible values for this attribute are defined by the XML Schema unsignedInt datatype.

Specifies the application which defined the provider type value specified by the <cryptProviderTypeExt> attribute.

<p:… p:cryptProviderTypeExt="00A5691D" 
  p:cryptProvideTypeExtSource="futureCryptography"
  p:hashData="9oN7nWkCAyEZib1RomSJTjmPpCY=" />

The @cryptProvideTypeExtSource attribute value of futureCryptography specifies that the provider type used here was published by the futureCryptography application. ]

The possible values for this attribute are defined by the XML Schema string datatype.

Specifies the hash value for the password stored with this document. This value shall be compared with the resulting hash value after hashing the user-supplied password using the algorithm specified by the preceding attributes and parent XML element, and if the two values match, the protection shall no longer be enforced.

If this value is omitted, then no password shall be associated with the protection, and it may be turned off without supplying any password.

<p:… p:cryptAlgorithmClass="hash" 
  p:cryptAlgorithmType="typeAny" 
  p:cryptAlgorithmSid="1"
  p:hashData="9oN7nWkCAyEZib1RomSJTjmPpCY=" />

The @hashData attribute value of 9oN7nWkCAyEZib1RomSJTjmPpCY= specifies that the user-supplied password shall be hashed using the pre-processing defined by the parent element (if any) followed by the SHA-1 algorithm (specified via the @cryptAlgorithmSid attribute value of 1) and that the resulting has value must be 9oN7nWkCAyEZib1RomSJTjmPpCY= for the protection to be disabled. ]

The possible values for this attribute are defined by the XML Schema string datatype.

Specifies the salt which was prepended to the user-supplied password before it was hashed using the hashing algorithm defined by the preceding attribute values to generate the @hashData attribute, and which shall also be prepended to the user-supplied password before attempting to generate a hash value for comparison. A salt is a random string which is added to a user-supplied password before it is hashed in order to prevent a malicious party from pre-calculating all possible password/hash combinations and simply using those precalculated values (often referred to as a "dictionary attack").

If this attribute is omitted, then no salt shall be prepended to the user-supplied password before it is hashed for comparison with the stored hash value.

<p:… p:saltData="ZUdHa+D8F/OAKP3I7ssUnQ=="
  p:hashData="9oN7nWkCAyEZib1RomSJTjmPpCY=" />

The @saltData attribute value of ZUdHa+D8F/OAKP3I7ssUnQ== specifies that the user-supplied password shall have this value prepended before it is run through the specified hashing algorithm to generate a resulting hash value for comparison. ]

The possible values for this attribute are defined by the XML Schema string datatype.