RSA exponentiation
@param in The octet array representing the base
@param inlen The length of the input
@param out The destination (to be stored in an octet array format)
@param outlen The length of the output buffer and the resulting size (zero padded to the size of the modulus)
@param which PK_PUBLIC for public RSA and PK_PRIVATE for private RSA
@param key The RSA key to use
@return CRYPT_OK on success
RSA exponentiation @param in The octet array representing the base @param inlen The length of the input @param out The destination (to be stored in an octet array format) @param outlen The length of the output buffer and the resulting size (zero padded to the size of the modulus) @param which PK_PUBLIC for public RSA and PK_PRIVATE for private RSA @param key The RSA key to use @return CRYPT_OK on success