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rsa/rsa_ossl.c: fix and extend commentary [skip ci].

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Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Nicola Tuveri <nic.tuv@gmail.com>
(Merged from https://github.com/openssl/openssl/pull/7123)

(cherry picked from commit d1c008f66b)
This commit is contained in:
Andy Polyakov 2018-09-05 14:33:21 +02:00
parent 7055086185
commit a9e4192e71
1 changed files with 2 additions and 1 deletions
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3
crypto/rsa/rsa_ossl.c
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@ -680,10 +680,11 @@ static int rsa_ossl_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx)
*/
|| !bn_mod_sub_fixed_top(r1, r1, m1, rsa->p)
/* r0 = r0 * iqmp mod p */
/* r1 = r1 * iqmp mod p */
|| !bn_to_mont_fixed_top(r1, r1, rsa->_method_mod_p, ctx)
|| !bn_mul_mont_fixed_top(r1, r1, rsa->iqmp, rsa->_method_mod_p,
ctx)
/* r0 = r1 * q + m1 */
|| !bn_mul_fixed_top(r0, r1, rsa->q, ctx)
|| !bn_mod_add_fixed_top(r0, r0, m1, rsa->n))
goto err;