DsaPrivateKey

DSA Private Keys

DSA private keys contain the following fields:

• "publicKey": The JSON representation of the corresponding DsaPublicKey
• "x": The secret exponent of this private key
• "size" : The size of the modulus in bits

Note: All fields are WebSafeBase64 encoded twos-complement representations of positive integers.

The digest size is 384 bits. SHA1 is used for the digest.

Key Hash

The KeyHash components are: [leftTrimZero(p).length] + [leftTrimZero(p)] + [leftTrimZero(q).length] + [leftTrimZero(q)] + [leftTrimZero(g).length] + [leftTrimZero(g)] + [leftTrimZero(y).length] + [leftTrimZero(y)]

Meta

The relevant parts of the KeyMetadata are as follows:

{
    ...
    "purpose": "SIGN_AND_VERIFY", 
    "type": "DSA_PUB",  
    ...
}

JSON Representation

{
    "publicKey": {
        "g": (g_bytes), 
        "p": (p_bytes), 
        "q": (q_bytes), 
        "size": 1024, 
        "y": (y_bytes)
    }, 
    "size": 1024, 
    "x": (x_bytes)
}

Supported Sizes and Key types

Java

1024 bit key size

Python

1024 bit key size

C++

Defaults to 2048 bits 1024, 2048, 3072 bit key sizes supported

If the compat flag is not set, then SHA224 is used as a digest for 2048 bit key sizes and SHA256 is used for 3072 bit key sizes.