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crypto/rsa: add exp mod in software crypto

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Implemented a simple exponentiation.
Signed-off-by: makejian <makejian@xiaomi.com>
This commit is contained in:
makejian 2024-08-07 22:03:37 +08:00 committed by Xiang Xiao
parent 72bdc9d9b4
commit 222840e135
1 changed files with 36 additions and 0 deletions
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36
crypto/cryptosoft.c
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@ -1155,6 +1155,33 @@ done:
return 0;
}
int swcr_mod_exp(struct cryptkop *krp)
{
uint8_t *input = (uint8_t *)krp->krp_param[0].crp_p;
uint8_t *exp = (uint8_t *)krp->krp_param[1].crp_p;
uint8_t *modulus = (uint8_t *)krp->krp_param[2].crp_p;
uint8_t *output = (uint8_t *)krp->krp_param[3].crp_p;
int input_len = krp->krp_param[0].crp_nbits / 8;
int exp_len = krp->krp_param[1].crp_nbits / 8;
int modulus_len = krp->krp_param[2].crp_nbits / 8;
int output_len = krp->krp_param[3].crp_nbits / 8;
struct bn a;
struct bn e;
struct bn n;
struct bn r;
bignum_init(&a);
bignum_init(&e);
bignum_init(&n);
bignum_init(&r);
memcpy(e.array, exp, exp_len);
memcpy(n.array, modulus, modulus_len);
memcpy(a.array, input, input_len);
pow_mod_faster(&a, &e, &n, &r);
memcpy(output, r.array, output_len);
return 0;
}
static int swcr_dh_make_public(FAR struct cryptkop *krp)
{
/* Curve25519 is used for testing. In fact,
@ -1229,6 +1256,13 @@ int swcr_kprocess(struct cryptkop *krp)
switch (krp->krp_op)
{
case CRK_MOD_EXP:
if ((krp->krp_status = swcr_mod_exp(krp)) != 0)
{
goto done;
}
break;
case CRK_DH_MAKE_PUBLIC:
if ((krp->krp_status = swcr_dh_make_public(krp) != 0))
{
@ -1248,6 +1282,7 @@ int swcr_kprocess(struct cryptkop *krp)
{
goto done;
}
break;
default:
@ -1317,6 +1352,7 @@ void swcr_init(void)
crypto_register(swcr_id, algs, swcr_newsession,
swcr_freesession, swcr_process);
kalgs[CRK_MOD_EXP] = CRYPTO_ALG_FLAG_SUPPORTED;
kalgs[CRK_DH_MAKE_PUBLIC] = CRYPTO_ALG_FLAG_SUPPORTED;
kalgs[CRK_DH_COMPUTE_KEY] = CRYPTO_ALG_FLAG_SUPPORTED;
kalgs[CRK_RSA_PKCS15_VERIFY] = CRYPTO_ALG_FLAG_SUPPORTED;