RsaPrivateKey

RSA Private Keys

RSA Private keys contain the following fields:

• "publicKey": A JSON representation of this private key's corresponding RsaPublicKey.
• "privateExponent": The RSA private exponent (d) of this private key
• "primeP": A secret prime factor (p) of the RSA modulus
• "primeQ": A secret prime factor (q) of the RSA modulus
• "primeCoefficientP": The private exponent d modulo prime p-1
• "primeCoefficientQ": The private exponent d modulo prime q-1
• "crtCoefficient": The inverse of the prime q modulo the prime p
• "size" : The size of the modulus in bits

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

Possible digest sizes are 128, 256, 512 or 256 depending on key size and implementation. SHA1 is used for digests

Key Hash

The KeyHash components are: [leftTrimZero(modulus).length] + [leftTrimZero(modulus)] + [leftTrimZero(public_exponent).length] + [leftTrimZero(public_exponent)]

If padding is PKCS don't left trim zero bytes.

Meta

{
    ...
    "purpose": ("SIGN_AND_VERIFY"|"DECRYPT_AND_ENCRYPT"), 
    "type": "RSA_PRIV", 
    ...
}

JSON Representation

{
    "crtCoefficient": (crt_bytes), 
    "primeExponentP": (exp_p_bytes), 
    "primeExponentQ": (exp_q_bytes), 
    "primeP": (p_bytes), 
    "primeQ": (q_bytes), 
    "privateExponent": (exp_bytes)
    "publicKey": {
        "modulus": (modulus_bytes), 
        "publicExponent": (exp_bytes), 
        "size": (1024|2048|4096),
        "padding": ("OEAP"|"PKCS")
    }, 
    "size": (1024|2048|4096)
}

Supported Sizes and Key types

Java

4096, 2048, 1024 bit key sizes supported Defaults to 4096 bit key size

Python

2048, 4096, 1024, 768, 512 bit key sizes supported Defaults to 2048 bit key size

C++

512, 768, 1024, 2048, 3072, 4096 key sizes supported Defaults to 2048 bit key size