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Some cards may return short RSA signatures without leading zero bytes. 

Add leading zeros to RSA signature so it is the size of modulus.
Return modulus length.

 Changes to be committed:
	modified:   src/libopensc/pkcs15-sec.c
This commit is contained in:
Doug Engert 2018-04-08 20:15:13 -05:00 committed by Frank Morgner
parent 376de5bd4c
commit fbc9ff84bc
1 changed files with 9 additions and 0 deletions
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9
src/libopensc/pkcs15-sec.c
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@ -456,6 +456,15 @@ int sc_pkcs15_compute_signature(struct sc_pkcs15_card *p15card,
r = use_key(p15card, obj, &senv, sc_compute_signature, tmp, inlen,
out, outlen);
LOG_TEST_RET(ctx, r, "use_key() failed");
/* Some cards may return RSA signature as integer without leading zero bytes */
/* Already know outlen >= modlen and r >= 0 */
if (obj->type == SC_PKCS15_TYPE_PRKEY_RSA && (unsigned)r < modlen) {
memmove(out + modlen - r, out, r);
memset(out, 0, modlen - r);
r = modlen;
}
sc_mem_clear(buf, sizeof(buf));
LOG_FUNC_RETURN(ctx, r);