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Fix cofactor return with cvc.

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Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
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Pol Henarejos 2022-11-11 17:08:36 +01:00
parent d09a7cf9c8
commit 8fe2677a56
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1 changed files with 7 additions and 1 deletions
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8
src/hsm/cvc.c
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@ -109,7 +109,13 @@ size_t asn1_cvc_public_key_ecdsa(mbedtls_ecdsa_context *ecdsa, uint8_t *buf, siz
size_t y_new_size = 0;
*p++ = 0x86; p += format_tlv_len(y_size, p); mbedtls_ecp_point_write_binary(&ecdsa->grp, &ecdsa->Q, MBEDTLS_ECP_PF_UNCOMPRESSED, &y_new_size, p, y_size); p += y_size;
//cofactor
*p++ = 0x87; p += format_tlv_len(c_size, p); *p++ = 1;
*p++ = 0x87; p += format_tlv_len(c_size, p);
if (ecdsa->grp.id == MBEDTLS_ECP_DP_CURVE448)
*p++ = 4;
else if (ecdsa->grp.id == MBEDTLS_ECP_DP_CURVE25519)
*p++ = 8;
else
*p++ = 1;
return tot_len;
}