Why if I call RSA_size() on an RSA object do I obtain a value less than the return value of i2d_RSAPublicKey (the size of the public key) called on the same RSA object?
Why if I call RSA_size() on an RSA object do I obtain a value
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Why if I call RSA_size() on an RSA object do I obtain a value less than the return value of i2d_RSAPublicKey (the size of the public key) called on the same RSA object?
Because
i2d_RSAPublicKeygives you a PKCS#1 encoded version of the key, including public exponent and DER elements.RSA_size()gives you just the size in bytes of the pure modulus (which is also the size of any unencoded signature or ciphertext for that key).