BCRYPT_DSA_KEY_BLOB structure (bcrypt.h)
The BCRYPT_DSA_KEY_BLOB structure is used as a header for a Digital Signature Algorithm (DSA) public key or private key BLOB in memory.
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;
dwMagic
Determines the type of key this structure represents. This can be one of the following values.
| Value | Meaning |
|---|---|
|
The structure represents a DSA public key. |
|
The structure represents a DSA private key. |
cbKey
The length, in bytes, of the key.
Count[4]
The number of iterations, in big-endian format, used to generate q.
Seed[20]
The seed value, in big-endian format, used to generate q.
q[20]
The 160-bit prime factor, in big-endian format.
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.
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.
BCRYPT_DSA_KEY_BLOB
Modulus[cbKey] // Big-endian.
Generator[cbKey] // Big-endian.
Public[cbKey] // Big-endian.
PrivateExponent[20] // Big-endian.
| Requirement | Value |
|---|---|
| Minimum supported client | Windows Vista [desktop apps only] |
| Minimum supported server | Windows Server 2008 [desktop apps only] |
| Header | bcrypt.h |