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Improve docs for ASN.1 bitstrings and their usage

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This commit is contained in:
Andres Amaya Garcia 2018-10-08 19:44:55 +01:00
parent abb7622d08
commit e730ff68ee
2 changed files with 18 additions and 8 deletions
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18
include/mbedtls/asn1write.h
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@ -189,16 +189,18 @@ int mbedtls_asn1_write_ia5_string( unsigned char **p, unsigned char *start,
const char *text, size_t text_len ); const char *text, size_t text_len );
/** /**
* \brief Write a bitstring tag (MBEDTLS_ASN1_BIT_STRING) and * \brief Write a bitstring tag (#MBEDTLS_ASN1_BIT_STRING) and
* value in ASN.1 format * value in ASN.1 format.
* Note: function works backwards in data buffer
* *
* \param p reference to current position pointer * \note This function works backwards in data buffer.
* \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 * \param p The reference to the current position pointer.
* \param start The start of the buffer, for bounds-checking.
* \param buf The bitstring to write.
* \param bits The total number of bits in the bitstring.
*
* \return The number of bytes written to \p p on success.
* \return A negative error code on failure.
*/ */
int mbedtls_asn1_write_bitstring( unsigned char **p, unsigned char *start, int mbedtls_asn1_write_bitstring( unsigned char **p, unsigned char *start,
const unsigned char *buf, size_t bits ); const unsigned char *buf, size_t bits );

8
include/mbedtls/x509_csr.h
View file

@ -205,6 +205,14 @@ void mbedtls_x509write_csr_set_md_alg( mbedtls_x509write_csr *ctx, mbedtls_md_ty
* \param key_usage key usage flags to set * \param key_usage key usage flags to set
* *
* \return 0 if successful, or MBEDTLS_ERR_X509_ALLOC_FAILED * \return 0 if successful, or MBEDTLS_ERR_X509_ALLOC_FAILED
*
* \note The <code>decipherOnly</code> flag from the Key Usage
* extension is represented by bit 8 (i.e.
* <code>0x8000</code>), which cannot typically be represented
* in an unsigned char. Therefore, the flag
* <code>decipherOnly</code> (i.e.
* #MBEDTLS_X509_KU_DECIPHER_ONLY) cannot be set using this
* function.
*/ */
int mbedtls_x509write_csr_set_key_usage( mbedtls_x509write_csr *ctx, unsigned char key_usage ); int mbedtls_x509write_csr_set_key_usage( mbedtls_x509write_csr *ctx, unsigned char key_usage );