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authorhemagx <ibrahem.h.basyone@gmail.com>2017-01-10 01:41:12 +0200
committerhemagx <ibrahem.h.basyone@gmail.com>2017-01-10 01:41:12 +0200
commit89e976aec097a2422f6faa08d4c8b0780df13acd (patch)
tree9db12a0b8dfd1877eeb17c1a035691ccc3a28630 /src/common/md5calc.c
parentdbc54eaa7e6091110e6437066b49a7cf8faea2b8 (diff)
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Update md5 calculation to be able to hash a binary buffer instead of only strings
Signed-off-by: hemagx <ibrahem.h.basyone@gmail.com>
Diffstat (limited to 'src/common/md5calc.c')
-rw-r--r--src/common/md5calc.c32
1 files changed, 15 insertions, 17 deletions
diff --git a/src/common/md5calc.c b/src/common/md5calc.c
index bd6b48f10..d2fc32371 100644
--- a/src/common/md5calc.c
+++ b/src/common/md5calc.c
@@ -168,16 +168,15 @@ static void md5_Round_Calculate(const unsigned char *block,
}
/// @copydoc md5_interface::binary()
-static void md5_string2binary(const char *string, unsigned char *output)
+static void md5_buf2binary(const uint8 *buf, const int buf_size, uint8 *output)
{
//var
/*8bit*/
unsigned char padding_message[64]; //Extended message 512bit 64byte
- const unsigned char *pstring; // The position of string in the present scanning notes is held.
+ const uint8 *pbuf; // The position of string in the present scanning notes is held.
/*32bit*/
- unsigned int string_byte_len, //The byte chief of string is held.
- string_bit_len, //The bit length of string is held.
+ unsigned int buf_bit_len, //The bit length of string is held.
copy_len, //The number of bytes which is used by 1-3 and which remained
msg_digest[4]; //Message digest 128bit 4byte
unsigned int *A = &msg_digest[0], //The message digest in accordance with RFC (reference)
@@ -195,16 +194,15 @@ static void md5_string2binary(const char *string, unsigned char *output)
//Step 1.Append Padding Bits (extension of a mark bit)
//1-1
- string_byte_len = (unsigned int)strlen(string); //The byte chief of a character sequence is acquired.
- pstring = (const unsigned char *)string; // The position of the present character sequence is set.
+ pbuf = buf; // The position of the present character sequence is set.
//1-2 Repeat calculation until length becomes less than 64 bytes.
- for (i=string_byte_len; 64<=i; i-=64,pstring+=64)
- md5_Round_Calculate(pstring, A,B,C,D);
+ for (i=buf_size; 64<=i; i-=64,pbuf+=64)
+ md5_Round_Calculate(pbuf, A,B,C,D);
//1-3
- copy_len = string_byte_len % 64; //The number of bytes which remained is computed.
- strncpy((char *)padding_message, (const char *)pstring, copy_len); // A message is copied to an extended bit sequence.
+ copy_len = buf_size % 64; //The number of bytes which remained is computed.
+ strncpy((char *)padding_message, (const char *)pbuf, copy_len); // A message is copied to an extended bit sequence.
memset(padding_message+copy_len, 0, 64 - copy_len); //It buries by 0 until it becomes extended bit length.
padding_message[copy_len] |= 0x80; //The next of a message is 1.
@@ -216,12 +214,12 @@ static void md5_string2binary(const char *string, unsigned char *output)
}
//Step 2.Append Length (the information on length is added)
- string_bit_len = string_byte_len * 8; //From the byte chief to bit length (32 bytes of low rank)
- memcpy(&padding_message[56], &string_bit_len, 4); //32 bytes of low rank is set.
+ buf_bit_len = buf_size * 8; //From the byte chief to bit length (32 bytes of low rank)
+ memcpy(&padding_message[56], &buf_bit_len, 4); //32 bytes of low rank is set.
//When bit length cannot be expressed in 32 bytes of low rank, it is a beam raising to a higher rank.
- if (UINT_MAX / 8 < string_byte_len) {
- unsigned int high = (string_byte_len - UINT_MAX / 8) * 8;
+ if (UINT_MAX / 8 < (unsigned int)buf_size) {
+ unsigned int high = (buf_size - UINT_MAX / 8) * 8;
memcpy(&padding_message[60], &high, 4);
} else {
memset(&padding_message[60], 0, 4); //In this case, it is good for a higher rank at 0.
@@ -237,12 +235,12 @@ static void md5_string2binary(const char *string, unsigned char *output)
/// @copydoc md5_interface::string()
void md5_string(const char *string, char *output)
{
- unsigned char digest[16];
+ uint8 digest[16];
nullpo_retv(string);
nullpo_retv(output);
- md5->binary(string,digest);
+ md5->binary((const uint8 *)string, (int)strlen(string), digest);
snprintf(output, 33, "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
digest[ 0], digest[ 1], digest[ 2], digest[ 3],
digest[ 4], digest[ 5], digest[ 6], digest[ 7],
@@ -267,7 +265,7 @@ void md5_salt(int len, char *output)
void md5_defaults(void)
{
md5 = &md5_s;
- md5->binary = md5_string2binary;
+ md5->binary = md5_buf2binary;
md5->string = md5_string;
md5->salt = md5_salt;
}