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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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20
include/mbedtls/asn1write.h
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@ -276,6 +276,26 @@ int mbedtls_asn1_write_ia5_string( unsigned char **p, unsigned char *start,
int mbedtls_asn1_write_bitstring( unsigned char **p, unsigned char *start,
const unsigned char *buf, size_t bits );
/**
* \brief Write a named bitstring tag (MBEDTLS_ASN1_BIT_STRING) and
* value in ASN.1 format
* Note: function works backwards in data buffer
*
* As stated in RFC5280 Appending B, trailing zeroes are
* omitted when encoding named bitstrings in DER.
*
* \param p Reference to current position pointer.
* \param start Start of the buffer (for bounds-checking).
* \param buf The bitstring.
* \param bits The total number of bits in the bitstring.
*
* \return The length written or a negative error code.
*/
int mbedtls_asn1_write_named_bitstring( unsigned char **p,
unsigned char *start,
const unsigned char *buf,
size_t bits );
/**
* \brief Write an octet string tag (#MBEDTLS_ASN1_OCTET_STRING)
* and value in ASN.1 format.