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OldKeyFileFormat.md

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Old key file format (prior to node-cryptopp v0.2.2)

Here is how a keypair file was built back then. Note that every number is in written in big endian, that the buffer resulting from the algorithm below was hex-encoded (for some reason I don't remember. But I don't think it was a valid reason. And I forgot to precise it in the README, like a big noob)

  • algoType : a byte; 0x00 for ECDSA, 0x01 for RSA, 0x02 for DSA, 0x03 for ECDH, 0x04 for ECIES
  • if keyType is ECDSA or ECIES
    • curveID : a byte, corresponding to the curve used
    • publicKeyX.length : length of the x coordinate of the public point (2 bytes, signed integer)
    • publicKeyX : x coordinate of the public point
    • publicKeyY.length : length of the y coordinate of the public point (2 bytes, signed integer)
    • publicKeyY : y coordinate of the public point
    • privateKey.length : length of the private key (2 bytes)
    • privateKey
  • if keyType is RSA
    • modulus.length : length of the RSA modulus (2 bytes, signed integer)
    • modulus : RSA modulus
    • publicExponent.length : length of the public exponent (2 bytes, signed integer)
    • publicExponent : RSA public exponent (or public key)
    • privateExponent.length : length of the private exponent (2 bytes, signed integer)
    • privateExponent : RSA private exponent (or private key)
  • if keyType is DSA
    • primeField.length : length of the prime field used by the DSA key pair (2 bytes, signed integer)
    • primeField
    • divider.length : length of the divider (2 bytes, signed integer)
    • divider
    • base.length : length of the base (2 bytes, signed integer)
    • base : DSA base
    • publicElement.length : length of the DSA public key (2 bytes, signed integer)
    • publicElement : DSA public key
    • privateExponent.length : length of the DSA private exponent (2 bytes, signed integer)
    • privateExponent : DSA private exponent (or private key)
  • if keyType is ECDH
    • curveID : a byte, corresponding to the curve used
    • publicKey.length : length of the ECDH public key (2 bytes, signed integer)
    • publicKey : ECDH public key
    • privateKey.length : length of the ECDH private key (2 bytes, signed integer)
    • privateKey : ECDH private key