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Make modinv able to return NULL if its inputs are not coprime, and

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check for that return value everywhere it is used.

[originally from svn r9990]
This commit is contained in:
Simon Tatham
2013-08-04 19:34:07 +00:00
parent 9c054cf467
commit cb1df53360
4 changed files with 59 additions and 14 deletions
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16
sshrsa.c
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@ -273,9 +273,18 @@ static Bignum rsa_privkey_op(Bignum input, struct RSAKey *key)
bignum_cmp(random, key->modulus) >= 0) {
freebn(random);
continue;
} else {
break;
}
/*
* Also, make sure it has an inverse mod modulus.
*/
random_inverse = modinv(random, key->modulus);
if (!random_inverse) {
freebn(random);
continue;
}
break;
}
/*
@ -294,7 +303,6 @@ static Bignum rsa_privkey_op(Bignum input, struct RSAKey *key)
*/
random_encrypted = crt_modpow(random, key->exponent,
key->modulus, key->p, key->q, key->iqmp);
random_inverse = modinv(random, key->modulus);
input_blinded = modmul(input, random_encrypted, key->modulus);
ret_blinded = crt_modpow(input_blinded, key->private_exponent,
key->modulus, key->p, key->q, key->iqmp);
@ -443,6 +451,8 @@ int rsa_verify(struct RSAKey *key)
freebn(key->iqmp);
key->iqmp = modinv(key->q, key->p);
if (!key->iqmp)
return 0;
}
/*