BCRYPT_DSA_KEY_BLOB Structure

The BCRYPT_DSA_KEY_BLOB structure is used as a header for a Digital Signature Algorithm (DSA) public key or private keyBLOB in memory.

Syntax

typedef struct _BCRYPT_DSA_KEY_BLOB {
    ULONG dwMagic;
    ULONG cbKey;
    UCHAR Count[4];
    UCHAR Seed[20];
    UCHAR q[20];
} BCRYPT_DSA_KEY_BLOB, *PBCRYPT_DSA_KEY_BLOB;  

Members

dwMagic
Determines the type of key this structure represents. This can be one of the following values.

cbKey
The length, in bytes, of the key.

Count
The number of iterations, in big-endian format, used to generate q.

Seed
The seed value, in big-endian format, used to generate q.

q
The 160-bit prime factor, in big-endian format.

Remarks

The structure applies to DSA keys that equal or exceed 512 bits in length but are less than or equal to 1024 bits.

This structure is used as a header for a larger buffer. A DSA public key BLOB (BCRYPT_DSA_PUBLIC_BLOB) has the following format in contiguous memory. The Modulus, Generator, and Public numbers are in big-endian format.

Example

BCRYPT_DSA_KEY_BLOB
Modulus[cbKey]    // Big-endian.
Generator[cbKey]  // Big-endian.
Public[cbKey]     // Big-endian.  

A DSA private key BLOB (BCRYPT_DSA_PRIVATE_BLOB) has the following format in contiguous memory. The Modulus, Generator, Public, and PrivateExponent numbers are in big-endian format.

Example

BCRYPT_DSA_KEY_BLOB
Modulus[cbKey]        // Big-endian.
Generator[cbKey]      // Big-endian.
Public[cbKey]         // Big-endian.
PrivateExponent[20]   // Big-endian.  

Requirements

Header: Declared in bcrypt.h.

Library: Use bcrypt.lib.