Metalpalo wrote:
Hello
Ihave got one question:
Does exist some way how to compute all attributes of private key from
modulus and private exponent?
I think as public exponent, prime1, prime2, exp1, exp2...
Thanks
If you want to generate a rsa key with openssl code (not in line command) :
RSA *rsa_ori = RSA_new(); // create a new rsa
BIGNUM *e = BN_new(); // create a new BN
EVP_PKEY* key = EVP_PKEY_new(); // create a blank one
if (! BN_hex2bn(&e , /* the wanted exponent in char* , wrote in hexa
i.e "010001"*/)) // set the BN value with the future exponent
return -1; // Error : can't set the exponent
if(! RSA_generate_key_ex(rsa_ori,/* int for the key length i.e 1024
*/,e,NULL)) // if the generation runs badly -> throw error
return -1; // Error : key can't be generated
// if can't put private part of rsa in evp -> throw error
if (EVP_PKEY_set1_RSA(key, RSAPrivateKey_dup(rsa_ori)) <1)
return -1; // Error : key can't be set.
Here both RSA struct and EVP_PKEY struct contains all numbers needed to
generate a rsa key.
I hope my answer help you ;)
Have a nice day,
pierre
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