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Add new function mbedtls_asn1_write_named_bitstring()

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Add a new function mbedtls_asn1_write_named_bitstring() that removes
trailing 0s at the end of DER encoded bitstrings. The function is
implemented according to Hanno Becker's suggestions.

This commit also changes the functions x509write_crt_set_ns_cert_type
and crt_set_key_usage to call the new function as the use named
bitstrings instead of the regular bitstrings.
This commit is contained in:
Andres Amaya Garcia
2018-09-26 10:48:24 +01:00
parent 62ec2dd68f
commit ec6329f23d
4 changed files with 109 additions and 24 deletions
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10
library/x509write_csr.c
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@ -89,12 +89,13 @@ int mbedtls_x509write_csr_set_key_usage( mbedtls_x509write_csr *ctx, unsigned ch
c = buf + 4;
if( ( ret = mbedtls_asn1_write_bitstring( &c, buf, &key_usage, 7 ) ) != 4 )
ret = mbedtls_asn1_write_named_bitstring( &c, buf, &key_usage, 8 );
if( ret < 3 || ret > 4 )
return( ret );
ret = mbedtls_x509write_csr_set_extension( ctx, MBEDTLS_OID_KEY_USAGE,
MBEDTLS_OID_SIZE( MBEDTLS_OID_KEY_USAGE ),
buf, 4 );
c, (size_t)ret );
if( ret != 0 )
return( ret );
@ -110,12 +111,13 @@ int mbedtls_x509write_csr_set_ns_cert_type( mbedtls_x509write_csr *ctx,
c = buf + 4;
if( ( ret = mbedtls_asn1_write_bitstring( &c, buf, &ns_cert_type, 8 ) ) != 4 )
ret = mbedtls_asn1_write_named_bitstring( &c, buf, &ns_cert_type, 8 );
if( ret < 3 || ret > 4 )
return( ret );
ret = mbedtls_x509write_csr_set_extension( ctx, MBEDTLS_OID_NS_CERT_TYPE,
MBEDTLS_OID_SIZE( MBEDTLS_OID_NS_CERT_TYPE ),
buf, 4 );
c, (size_t)ret );
if( ret != 0 )
return( ret );