[base16] Add buffer size parameter to base16_encode() and base16_decode()
The current API for Base16 (and Base64) encoding requires the caller to always provide sufficient buffer space. This prevents the use of the generic encoding/decoding functionality in some situations, such as in formatting the hex setting types. Implement a generic hex_encode() (based on the existing format_hex_setting()), implement base16_encode() and base16_decode() in terms of the more generic hex_encode() and hex_decode(), and update all callers to provide the additional buffer length parameter. Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
parent
b56b482fa3
commit
9aa8090d06
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@ -28,6 +28,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <errno.h>
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#include <assert.h>
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#include <ipxe/string.h>
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#include <ipxe/vsprintf.h>
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#include <ipxe/base16.h>
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/** @file
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@ -37,48 +38,42 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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*/
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/**
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* Base16-encode data
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* Encode hexadecimal string (with optional byte separator character)
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*
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* @v separator Byte separator character, or 0 for no separator
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* @v raw Raw data
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* @v len Length of raw data
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* @v encoded Buffer for encoded string
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*
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* The buffer must be the correct length for the encoded string. Use
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* something like
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*
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* char buf[ base16_encoded_len ( len ) + 1 ];
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*
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* (the +1 is for the terminating NUL) to provide a buffer of the
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* correct size.
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* @v raw_len Length of raw data
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* @v data Buffer
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* @v len Length of buffer
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* @ret len Encoded length
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*/
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void base16_encode ( const uint8_t *raw, size_t len, char *encoded ) {
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const uint8_t *raw_bytes = raw;
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char *encoded_bytes = encoded;
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size_t remaining = len;
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size_t hex_encode ( char separator, const void *raw, size_t raw_len,
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char *data, size_t len ) {
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const uint8_t *bytes = raw;
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const char delimiter[2] = { separator, '\0' };
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size_t used = 0;
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unsigned int i;
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/* Encode each byte */
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for ( ; remaining-- ; encoded_bytes += 2 ) {
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sprintf ( encoded_bytes, "%02x", *(raw_bytes++) );
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if ( len )
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data[0] = 0; /* Ensure that a terminating NUL exists */
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for ( i = 0 ; i < raw_len ; i++ ) {
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used += ssnprintf ( ( data + used ), ( len - used ),
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"%s%02x", ( used ? delimiter : "" ),
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bytes[i] );
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}
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/* Ensure terminating NUL exists even if length was zero */
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*encoded_bytes = '\0';
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DBG ( "Base16-encoded to \"%s\":\n", encoded );
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DBG_HDA ( 0, raw, len );
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assert ( strlen ( encoded ) == base16_encoded_len ( len ) );
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return used;
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}
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/**
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* Decode hexadecimal string
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* Decode hexadecimal string (with optional byte separator character)
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*
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* @v encoded Encoded string
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* @v separator Byte separator character, or 0 for no separator
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* @v encoded Encoded string
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* @v data Buffer
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* @v len Length of buffer
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* @ret len Length of data, or negative error
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*/
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int hex_decode ( const char *encoded, char separator, void *data, size_t len ) {
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int hex_decode ( char separator, const char *encoded, void *data, size_t len ) {
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uint8_t *out = data;
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unsigned int count = 0;
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unsigned int sixteens;
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@ -110,31 +105,3 @@ int hex_decode ( const char *encoded, char separator, void *data, size_t len ) {
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}
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return count;
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}
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/**
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* Base16-decode data
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*
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* @v encoded Encoded string
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* @v raw Raw data
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* @ret len Length of raw data, or negative error
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*
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* The buffer must be large enough to contain the decoded data. Use
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* something like
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*
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* char buf[ base16_decoded_max_len ( encoded ) ];
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*
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* to provide a buffer of the correct size.
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*/
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int base16_decode ( const char *encoded, uint8_t *raw ) {
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int len;
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len = hex_decode ( encoded, 0, raw, -1UL );
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if ( len < 0 )
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return len;
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DBG ( "Base16-decoded \"%s\" to:\n", encoded );
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DBG_HDA ( 0, raw, len );
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assert ( len <= ( int ) base16_decoded_max_len ( encoded ) );
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return len;
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}
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@ -2005,32 +2005,6 @@ const struct setting_type setting_type_uint16 __setting_type =
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const struct setting_type setting_type_uint32 __setting_type =
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SETTING_TYPE_UINT ( SETTING_TYPE_INT32 );
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/**
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* Format hex string setting value
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*
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* @v delimiter Byte delimiter
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* @v raw Raw setting value
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* @v raw_len Length of raw setting value
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* @v buf Buffer to contain formatted value
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* @v len Length of buffer
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* @ret len Length of formatted value, or negative error
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*/
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static int format_hex_setting ( const char *delimiter, const void *raw,
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size_t raw_len, char *buf, size_t len ) {
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const uint8_t *bytes = raw;
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int used = 0;
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unsigned int i;
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if ( len )
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buf[0] = 0; /* Ensure that a terminating NUL exists */
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for ( i = 0 ; i < raw_len ; i++ ) {
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used += ssnprintf ( ( buf + used ), ( len - used ),
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"%s%02x", ( used ? delimiter : "" ),
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bytes[i] );
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}
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return used;
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}
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/**
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* Parse hex string setting value (using colon delimiter)
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*
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@ -2043,7 +2017,7 @@ static int format_hex_setting ( const char *delimiter, const void *raw,
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*/
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static int parse_hex_setting ( const struct setting_type *type __unused,
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const char *value, void *buf, size_t len ) {
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return hex_decode ( value, ':', buf, len );
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return hex_decode ( ':', value, buf, len );
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}
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/**
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@ -2059,7 +2033,7 @@ static int parse_hex_setting ( const struct setting_type *type __unused,
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static int format_hex_colon_setting ( const struct setting_type *type __unused,
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const void *raw, size_t raw_len,
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char *buf, size_t len ) {
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return format_hex_setting ( ":", raw, raw_len, buf, len );
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return hex_encode ( ':', raw, raw_len, buf, len );
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}
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/**
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@ -2075,7 +2049,7 @@ static int format_hex_colon_setting ( const struct setting_type *type __unused,
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static int parse_hex_hyphen_setting ( const struct setting_type *type __unused,
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const char *value, void *buf,
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size_t len ) {
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return hex_decode ( value, '-', buf, len );
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return hex_decode ( '-', value, buf, len );
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}
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/**
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@ -2091,7 +2065,7 @@ static int parse_hex_hyphen_setting ( const struct setting_type *type __unused,
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static int format_hex_hyphen_setting ( const struct setting_type *type __unused,
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const void *raw, size_t raw_len,
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char *buf, size_t len ) {
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return format_hex_setting ( "-", raw, raw_len, buf, len );
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return hex_encode ( '-', raw, raw_len, buf, len );
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}
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/**
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@ -2106,7 +2080,7 @@ static int format_hex_hyphen_setting ( const struct setting_type *type __unused,
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*/
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static int parse_hex_raw_setting ( const struct setting_type *type __unused,
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const char *value, void *buf, size_t len ) {
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return hex_decode ( value, 0, buf, len );
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return hex_decode ( 0, value, buf, len );
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}
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/**
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@ -2122,7 +2096,7 @@ static int parse_hex_raw_setting ( const struct setting_type *type __unused,
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static int format_hex_raw_setting ( const struct setting_type *type __unused,
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const void *raw, size_t raw_len,
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char *buf, size_t len ) {
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return format_hex_setting ( "", raw, raw_len, buf, len );
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return hex_encode ( 0, raw, raw_len, buf, len );
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}
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/** A hex-string setting (colon-delimited) */
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@ -143,7 +143,8 @@ const char * x509_name ( struct x509_certificate *cert ) {
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} else {
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/* Certificate has no commonName: use SHA-1 fingerprint */
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x509_fingerprint ( cert, digest, fingerprint );
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base16_encode ( fingerprint, sizeof ( fingerprint ), buf );
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base16_encode ( fingerprint, sizeof ( fingerprint ),
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buf, sizeof ( buf ) );
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}
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return buf;
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}
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@ -105,7 +105,7 @@ int ecm_fetch_mac ( struct usb_device *usb,
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return -EINVAL;
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/* Decode MAC address */
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len = base16_decode ( buf, hw_addr );
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len = base16_decode ( buf, hw_addr, ETH_ALEN );
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if ( len < 0 ) {
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rc = len;
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return rc;
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@ -139,7 +139,7 @@ static int netfront_read_mac ( struct netfront_nic *netfront, void *hw_addr ) {
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xendev->key, mac );
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/* Decode MAC address */
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len = hex_decode ( mac, ':', hw_addr, ETH_ALEN );
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len = hex_decode ( ':', mac, hw_addr, ETH_ALEN );
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if ( len < 0 ) {
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rc = len;
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DBGC ( netfront, "NETFRONT %s could not decode MAC address "
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@ -32,9 +32,36 @@ static inline size_t base16_decoded_max_len ( const char *encoded ) {
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return ( ( strlen ( encoded ) + 1 ) / 2 );
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}
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extern void base16_encode ( const uint8_t *raw, size_t len, char *encoded );
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extern int hex_decode ( const char *string, char separator, void *data,
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extern size_t hex_encode ( char separator, const void *raw, size_t raw_len,
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char *data, size_t len );
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extern int hex_decode ( char separator, const char *encoded, void *data,
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size_t len );
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extern int base16_decode ( const char *encoded, uint8_t *raw );
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/**
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* Base16-encode data
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*
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* @v raw Raw data
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* @v raw_len Length of raw data
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* @v data Buffer
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* @v len Length of buffer
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* @ret len Encoded length
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*/
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static inline __attribute__ (( always_inline )) size_t
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base16_encode ( const void *raw, size_t raw_len, char *data, size_t len ) {
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return hex_encode ( 0, raw, raw_len, data, len );
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}
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/**
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* Base16-decode data
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*
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* @v encoded Encoded string
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* @v data Buffer
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* @v len Length of buffer
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* @ret len Length of data, or negative error
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*/
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static inline __attribute__ (( always_inline )) int
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base16_decode ( const char *encoded, void *data, size_t len ) {
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return hex_decode ( 0, encoded, data, len );
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}
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#endif /* _IPXE_BASE16_H */
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@ -330,7 +330,7 @@ const char * efi_devpath_text ( EFI_DEVICE_PATH_PROTOCOL *path ) {
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max_len = ( ( sizeof ( text ) - 1 /* NUL */ ) / 2 /* "xx" */ );
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if ( len > max_len )
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len = max_len;
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base16_encode ( start, len, text );
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base16_encode ( start, len, text, sizeof ( text ) );
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return text;
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}
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@ -291,7 +291,7 @@ static int ib_srp_parse_byte_string ( const char *rp_comp, uint8_t *bytes,
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return -EINVAL_BYTE_STRING_LEN;
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/* Parse byte string */
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decoded_size = base16_decode ( rp_comp, bytes );
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decoded_size = base16_decode ( rp_comp, bytes, size );
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if ( decoded_size < 0 )
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return decoded_size;
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@ -63,7 +63,7 @@ peerdist_info_hash_ntoa ( const struct peerdist_info *info, const void *hash ) {
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assert ( base16_encoded_len ( digestsize ) < sizeof ( buf ) );
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/* Transcribe hash value */
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base16_encode ( hash, digestsize, buf );
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base16_encode ( hash, digestsize, buf, sizeof ( buf ) );
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return buf;
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}
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*
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* @v ctx Digest context
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* @v out Buffer for digest output
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* @v len Buffer length
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*/
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static void http_digest_final ( struct md5_context *ctx, char *out ) {
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static void http_digest_final ( struct md5_context *ctx, char *out,
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size_t len ) {
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uint8_t digest[MD5_DIGEST_SIZE];
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digest_final ( &md5_algorithm, ctx, digest );
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base16_encode ( digest, sizeof ( digest ), out );
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base16_encode ( digest, sizeof ( digest ), out, len );
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}
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/**
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http_digest_update ( &ctx, user );
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http_digest_update ( &ctx, realm );
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http_digest_update ( &ctx, password );
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http_digest_final ( &ctx, ha1 );
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http_digest_final ( &ctx, ha1, sizeof ( ha1 ) );
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if ( md5sess ) {
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http_digest_init ( &ctx );
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http_digest_update ( &ctx, ha1 );
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http_digest_update ( &ctx, nonce );
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http_digest_update ( &ctx, cnonce );
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http_digest_final ( &ctx, ha1 );
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http_digest_final ( &ctx, ha1, sizeof ( ha1 ) );
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}
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/* Generate HA2 */
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http_digest_init ( &ctx );
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http_digest_update ( &ctx, method );
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http_digest_update ( &ctx, uri );
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http_digest_final ( &ctx, ha2 );
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http_digest_final ( &ctx, ha2, sizeof ( ha2 ) );
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/* Generate response */
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http_digest_init ( &ctx );
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http_digest_update ( &ctx, "auth" /* qop */ );
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}
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http_digest_update ( &ctx, ha2 );
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http_digest_final ( &ctx, response );
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http_digest_final ( &ctx, response, sizeof ( response ) );
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/* Generate the authorisation string */
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len = asprintf ( &auth, "Authorization: Digest username=\"%s\", "
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@ -709,7 +709,7 @@ static int iscsi_build_login_request_strings ( struct iscsi_session *iscsi,
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char buf[ base16_encoded_len ( iscsi->chap.response_len ) + 1 ];
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assert ( iscsi->initiator_username != NULL );
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base16_encode ( iscsi->chap.response, iscsi->chap.response_len,
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buf );
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buf, sizeof ( buf ) );
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used += ssnprintf ( data + used, len - used,
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"CHAP_N=%s%cCHAP_R=0x%s%c",
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iscsi->initiator_username, 0, buf, 0 );
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size_t challenge_len = ( sizeof ( iscsi->chap_challenge ) - 1 );
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char buf[ base16_encoded_len ( challenge_len ) + 1 ];
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base16_encode ( ( iscsi->chap_challenge + 1 ), challenge_len,
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buf );
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buf, sizeof ( buf ) );
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used += ssnprintf ( data + used, len - used,
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"CHAP_I=%d%cCHAP_C=0x%s%c",
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iscsi->chap_challenge[0], 0, buf, 0 );
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@ -833,15 +833,17 @@ static int iscsi_tx_login_request ( struct iscsi_session *iscsi ) {
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*
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* @v encoded Encoded large binary value
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* @v raw Raw data
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* @v len Length of data buffer
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* @ret len Length of raw data, or negative error
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*/
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static int iscsi_large_binary_decode ( const char *encoded, uint8_t *raw ) {
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static int iscsi_large_binary_decode ( const char *encoded, uint8_t *raw,
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size_t len ) {
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/* Check for initial '0x' or '0b' and decode as appropriate */
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if ( *(encoded++) == '0' ) {
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switch ( tolower ( *(encoded++) ) ) {
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case 'x' :
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return base16_decode ( encoded, raw );
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return base16_decode ( encoded, raw, len );
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case 'b' :
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return base64_decode ( encoded, raw );
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}
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@ -980,7 +982,7 @@ static int iscsi_handle_chap_c_value ( struct iscsi_session *iscsi,
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int rc;
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/* Process challenge */
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len = iscsi_large_binary_decode ( value, buf );
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len = iscsi_large_binary_decode ( value, buf, sizeof ( buf ) );
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if ( len < 0 ) {
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rc = len;
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DBGC ( iscsi, "iSCSI %p invalid CHAP challenge \"%s\": %s\n",
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@ -1065,7 +1067,7 @@ static int iscsi_handle_chap_r_value ( struct iscsi_session *iscsi,
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chap_respond ( &iscsi->chap );
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/* Process response */
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len = iscsi_large_binary_decode ( value, buf );
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len = iscsi_large_binary_decode ( value, buf, sizeof ( buf ) );
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if ( len < 0 ) {
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rc = len;
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DBGC ( iscsi, "iSCSI %p invalid CHAP response \"%s\": %s\n",
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@ -77,30 +77,42 @@ BASE16 ( random_test,
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* Report a base16 encoding test result
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*
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* @v test Base16 test
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* @v file Test code file
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* @v line Test code line
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*/
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#define base16_encode_ok( test ) do { \
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size_t len = base16_encoded_len ( (test)->len ); \
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char buf[ len + 1 /* NUL */ ]; \
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ok ( len == strlen ( (test)->encoded ) ); \
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base16_encode ( (test)->data, (test)->len, buf ); \
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ok ( strcmp ( (test)->encoded, buf ) == 0 ); \
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} while ( 0 )
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static void base16_encode_okx ( struct base16_test *test, const char *file,
|
||||
unsigned int line ) {
|
||||
size_t len = base16_encoded_len ( test->len );
|
||||
char buf[ len + 1 /* NUL */ ];
|
||||
size_t check_len;
|
||||
|
||||
okx ( len == strlen ( test->encoded ), file, line );
|
||||
check_len = base16_encode ( test->data, test->len, buf, sizeof ( buf ));
|
||||
okx ( check_len == len, file, line );
|
||||
okx ( strcmp ( test->encoded, buf ) == 0, file, line );
|
||||
}
|
||||
#define base16_encode_ok( test ) base16_encode_okx ( test, __FILE__, __LINE__ )
|
||||
|
||||
/**
|
||||
* Report a base16 decoding test result
|
||||
*
|
||||
* @v test Base16 test
|
||||
* @v file Test code file
|
||||
* @v line Test code line
|
||||
*/
|
||||
#define base16_decode_ok( test ) do { \
|
||||
size_t max_len = base16_decoded_max_len ( (test)->encoded ); \
|
||||
uint8_t buf[max_len]; \
|
||||
int len; \
|
||||
len = base16_decode ( (test)->encoded, buf ); \
|
||||
ok ( len >= 0 ); \
|
||||
ok ( ( size_t ) len <= max_len ); \
|
||||
ok ( ( size_t ) len == (test)->len ); \
|
||||
ok ( memcmp ( (test)->data, buf, len ) == 0 ); \
|
||||
} while ( 0 )
|
||||
static void base16_decode_okx ( struct base16_test *test, const char *file,
|
||||
unsigned int line ) {
|
||||
size_t max_len = base16_decoded_max_len ( test->encoded );
|
||||
uint8_t buf[max_len];
|
||||
int len;
|
||||
|
||||
len = base16_decode ( test->encoded, buf, sizeof ( buf ) );
|
||||
okx ( len >= 0, file, line );
|
||||
okx ( ( size_t ) len <= max_len, file, line );
|
||||
okx ( ( size_t ) len == test->len, file, line );
|
||||
okx ( memcmp ( test->data, buf, len ) == 0, file, line );
|
||||
}
|
||||
#define base16_decode_ok( test ) base16_decode_okx ( test, __FILE__, __LINE__ )
|
||||
|
||||
/**
|
||||
* Perform Base16 self-tests
|
||||
|
|
Reference in New Issue