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scd: New function for iso7816 PSO_CSV.

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* scd/iso7816.c (iso7816_pso_csv): New.
This commit is contained in:
Werner Koch 2021-03-29 14:48:11 +02:00
parent 855d14d390
commit 91dd74f3d7
No known key found for this signature in database
GPG Key ID: E3FDFF218E45B72B
2 changed files with 64 additions and 0 deletions
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61
scd/iso7816.c
View File

@ -628,6 +628,67 @@ iso7816_decipher (int slot, int extended_mode,
}
/* Perform the security operation COMPUTE SHARED SECRET. On success 0
is returned and the shared secret is available in a newly allocated
buffer stored at RESULT with its length stored at RESULTLEN. For
LE see do_generate_keypair. */
gpg_error_t
iso7816_pso_csv (int slot, int extended_mode,
const unsigned char *data, size_t datalen, int le,
unsigned char **result, size_t *resultlen)
{
int sw;
unsigned char *buf;
unsigned int nbuf;
if (!data || !datalen || !result || !resultlen)
return gpg_error (GPG_ERR_INV_VALUE);
*result = NULL;
*resultlen = 0;
if (!extended_mode)
le = 256; /* Ignore provided Le and use what apdu_send uses. */
else if (le >= 0 && le < 256)
le = 256;
/* Data needs to be in BER-TLV format. */
buf = xtrymalloc (datalen + 4);
if (!buf)
return gpg_error_from_syserror ();
nbuf = 0;
buf[nbuf++] = 0x9c;
if (datalen < 128)
buf[nbuf++] = datalen;
else if (datalen < 256)
{
buf[nbuf++] = 0x81;
buf[nbuf++] = datalen;
}
else
{
buf[nbuf++] = 0x82;
buf[nbuf++] = datalen << 8;
buf[nbuf++] = datalen;
}
memcpy (buf+nbuf, data, datalen);
sw = apdu_send_le (slot, extended_mode,
0x00, CMD_PSO, 0x80, 0xa6,
datalen+nbuf, (const char *)buf, le,
result, resultlen);
xfree (buf);
if (sw != SW_SUCCESS)
{
/* Make sure that pending buffers are released. */
xfree (*result);
*result = NULL;
*resultlen = 0;
return map_sw (sw);
}
return 0;
}
/* For LE see do_generate_keypair. */
gpg_error_t
iso7816_internal_authenticate (int slot, int extended_mode,

3
scd/iso7816.h
View File

@ -110,6 +110,9 @@ gpg_error_t iso7816_decipher (int slot, int extended_mode,
const unsigned char *data, size_t datalen,
int le, int padind,
unsigned char **result, size_t *resultlen);
gpg_error_t iso7816_pso_csv (int slot, int extended_mode,
const unsigned char *data, size_t datalen, int le,
unsigned char **result, size_t *resultlen);
gpg_error_t iso7816_internal_authenticate (int slot, int extended_mode,
const unsigned char *data, size_t datalen,
int le,