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TinyCrypt PK write: Impl. PK writing helpers for TC-based PK context

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This commit is contained in:
Hanno Becker 2019-08-21 16:19:55 +01:00
parent 64a81b03aa
commit 28332a5642
1 changed files with 51 additions and 0 deletions
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51
library/pkwrite.c
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@ -103,6 +103,56 @@ end_of_export:
}
#endif /* MBEDTLS_RSA_C */
#if defined(MBEDTLS_USE_TINYCRYPT)
static int pk_write_ec_pubkey( unsigned char **p, unsigned char *start,
mbedtls_pk_context const *key )
{
size_t const len = 1 + 2 * NUM_ECC_BYTES;
mbedtls_uecc_keypair const * const uecc = mbedtls_pk_uecc( *key );
if( *p < start || (size_t)( *p - start ) < len )
return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
*p -= len;
(*p)[0] = 0x04;
memcpy( *p + 1, uecc->public_key, 2 * NUM_ECC_BYTES );
return( (int) len );
}
static int pk_write_ec_privkey( unsigned char **p, unsigned char *start,
mbedtls_pk_context const *key )
{
mbedtls_uecc_keypair const * const uecc = mbedtls_pk_uecc( *key );
return( mbedtls_asn1_write_octet_string(
p, start,
uecc->private_key,
NUM_ECC_BYTES ) );
}
/*
* ECParameters ::= CHOICE {
* namedCurve OBJECT IDENTIFIER
* }
*/
static int pk_write_ec_param( unsigned char **p, unsigned char *start,
mbedtls_pk_context const *key )
{
int ret;
size_t len = 0;
const char *oid;
size_t oid_len;
((void) key);
if( ( ret = mbedtls_oid_get_oid_by_ec_grp( MBEDTLS_UECC_DP_SECP256R1,
&oid, &oid_len ) ) != 0 )
return( ret );
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_oid( p, start, oid, oid_len ) );
return( (int) len );
}
#else /* MBEDTLS_USE_TINYCRYPT */
#if defined(MBEDTLS_ECP_C)
/*
* EC public key is an EC point
@ -160,6 +210,7 @@ static int pk_write_ec_param( unsigned char **p, unsigned char *start,
return( (int) len );
}
#endif /* MBEDTLS_ECP_C */
#endif /* MBEDTLS_USE_TINYCRYPT */
int mbedtls_pk_write_pubkey( unsigned char **p, unsigned char *start,
const mbedtls_pk_context *key )