AuthenticationMD5Password
AuthenticationMD5Password is a backend protocol message. Identifies the message as an authentication request.
Reading PG 18·Select a recorded version
- Direction
- Backend → frontend
- First wire field
- Byte1('R')
- Field entries
- 4
- Documented flow contexts
- Start-up
- direction
- B
- manual path
- /docs/18/protocol-message-formats.html
- signature
- AuthenticationMD5Password (B)
Definition PG 18
-
- Byte1('R')
-
Identifies the message as an authentication request.
- Int32(12)
-
Length of message contents in bytes, including self.
- Int32(5)
-
Specifies that an MD5-encrypted password is required.
- Byte4
-
The salt to use when encrypting the password.
Wire fields in documented order
| Position | Format | Meaning |
|---|---|---|
| 1 | Byte1('R') | Identifies the message as an authentication request. |
| 2 | Int32(12) | Length of message contents in bytes, including self. |
| 3 | Int32(5) | Specifies that an MD5-encrypted password is required. |
| 4 | Byte4 | The salt to use when encrypting the password. |
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Complete source facts
fields
map[description:Identifies the message as an authentication request. format:Byte1('R')], map[description:Length of message contents in bytes, including self. format:Int32(12)], map[description:Specifies that an MD5-encrypted password is required. format:Int32(5)], map[description:The salt to use when encrypting the password. format:Byte4]Source references
Full definition and evidence JSON
Definition sources
center · PostgreSQL 18 · 555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f
Text language: en · 555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f