PUBLICKEYSTRUC

This structure, also known as the BLOBHEADER structure, indicates a key's BLOB type and the algorithm that the key uses. It is located at the beginning of the pbData member of every key BLOB.

This structure is not limited to the key BLOB structures generated by the PROV_RSA_BASE and PROV_RSA_SIG provider types. The pbData of any new key BLOB structure type must begin with this structure.

typedef struct _PUBLICKEYSTRUC {
BYTE bType;
BYTE bVersion;
WORD reserved;
ALG_ID aiKeyAlg;
} BLOBHEADER, PUBLICKEYSTRUC;

Members

• bType
  Key BLOB type. The only BLOB types currently defined are PUBLICKEYBLOB, PRIVATEKEYBLOB, and SIMPLEBLOB. Other key BLOB types will be defined as needed.

  PUBLICKEYBLOB types are used to transport public keys, PRIVATEKEYBLOBs are used to transport public/private key pairs, and SIMPLEBLOBs are used to transport session keys.

• bVersion
  Version number of the key BLOB format. This currently must always have a value of 0x02.

• reserved
  DWORD reserved for future use. Must be set to zero.

• aiKeyAlg
  Algorithm identifier for the key contained by the key BLOB structure. Some examples are CALG_RSA_SIGN, CALG_RSA_KEYX, CALG_RC2, and CALG_RC4.

  Not all algorithm identifiers are valid with all BLOB types. For example, because an RC4 key is a session key, it cannot be exported into a PUBLICKEYBLOB.

Requirements

Note   This API is part of the complete Windows CE OS package as provided by Microsoft. The functionality of a particular platform is determined by the original equipment manufacturer (OEM) and some devices may not support this API.

See Also

BLOB

 Last updated on Tuesday, July 13, 2004

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