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Second Life Creation

llSHA1String

string llSHA1String(string Text)

Returns a string of 40 hex characters that is the SHA1 security hash of text.

Parameters
Text (string)
Technical Details
  • Return Type: string
  • Energy: 10

The SHA-1 hashing algorithm is considered broken but the attacks are largely still theoretical and not very practical. Consider using the more secure llSHA256String instead.

Examples

Section titled “Examples”
llSay(0, llSHA1String("Hello, Avatar!")); // returns 2E73318E547AF1B28CC0C96F95DDC9B1EE906B8D

Linux Verification

Section titled “Linux Verification”

You can verify the hash output using OpenSSL:

Terminal window
$ echo -n 'Hello, Avatar!' | openssl sha1
2E73318E547AF1B28CC0C96F95DDC9B1EE906B8D

Caveats

Section titled “Caveats”
  • There’s no way to input a zero-byte value into this function, nor any byte value from 128-255, which makes it broken for many purposes like HMAC-SHA1
  • LSL strings cannot have a unicode null character (U+0000), and LSL has no escape code for the null character (unlike most programming languages that use \0)
  • Characters with Unicode integer value over U+0127 (007F) are handled in UTF-8 fashion: 0xC2 is appended to the byte value (so 0x0080-0x00FF become 0xC280-0xC2FF inside the function)
  • Before this function was available, the only way to get SHA-1 hashes was to use the LSL SHA-1 script port

See Also

Section titled “See Also”