StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PO
text
Body
copied!<p>According to MySQL documentation, the algorithm is a double SHA1 hash. When examining the MySQL source code, you find a function called make_scrambled_password() in libmysql/password.c. The function is defined as follows:</p> <pre><code>/* MySQL 4.1.1 password hashing: SHA conversion (see RFC 2289, 3174) twice applied to the password string, and then produced octet sequence is converted to hex string. The result of this function is used as return value from PASSWORD() and is stored in the database. SYNOPSIS make_scrambled_password() buf OUT buffer of size 2*SHA1_HASH_SIZE + 2 to store hex string password IN NULL-terminated password string */ void make_scrambled_password(char *to, const char *password) { SHA1_CONTEXT sha1_context; uint8 hash_stage2[SHA1_HASH_SIZE]; mysql_sha1_reset(&sha1_context); /* stage 1: hash password */ mysql_sha1_input(&sha1_context, (uint8 *) password, (uint) strlen(password)); mysql_sha1_result(&sha1_context, (uint8 *) to); /* stage 2: hash stage1 output */ mysql_sha1_reset(&sha1_context); mysql_sha1_input(&sha1_context, (uint8 *) to, SHA1_HASH_SIZE); /* separate buffer is used to pass 'to' in octet2hex */ mysql_sha1_result(&sha1_context, hash_stage2); /* convert hash_stage2 to hex string */ *to++= PVERSION41_CHAR; octet2hex(to, (const char*) hash_stage2, SHA1_HASH_SIZE); } </code></pre> <p>Given this method, you can create a .NET counterpart that basically does the same thing. Here's what I've come up with. When I run SELECT PASSWORD('test'); against my local copy of MySQL, the value returned is:</p> <p><code>*94BDCEBE19083CE2A1F959FD02F964C7AF4CFC29</code></p> <p>According to the source code (again in password.c), the beginning asterisk indicates that this is the post-MySQL 4.1 method of encrypting the password. When I emulate the functionality in VB.Net for example, this is what I come up with:</p> <pre><code>Public Function GenerateMySQLHash(ByVal strKey As String) As String Dim keyArray As Byte() = Encoding.UTF8.GetBytes(strKey) Dim enc = New SHA1Managed() Dim encodedKey = enc.ComputeHash(enc.ComputeHash(keyArray)) Dim myBuilder As New StringBuilder(encodedKey.Length) For Each b As Byte In encodedKey myBuilder.Append(b.ToString("X2")) Next Return "*" & myBuilder.ToString() End Function </code></pre> <p>Keep in mind that SHA1Managed() is in the System.Security.Cryptography namespace. This method returns the same output as the PASSWORD() call in MySQL. I hope this helps for you.</p> <p>Edit: Here's the same code in C#</p> <pre><code>public string GenerateMySQLHash(string key) { byte[] keyArray = Encoding.UTF8.GetBytes(key); SHA1Managed enc = new SHA1Managed(); byte[] encodedKey = enc.ComputeHash(enc.ComputeHash(keyArray)); StringBuilder myBuilder = new StringBuilder(encodedKey.Length); foreach (byte b in encodedKey) myBuilder.Append(b.ToString("X2")); return "*" + myBuilder.ToString(); } </code></pre>

Querying!

Guidance

An individual column

Larger individual text columns get their own page to allow for proper reading.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload