Add cipher seeding with Rust SDK encryption to enable cryptographically correct test data generation (#6896)

util/Seeder/Data/UsernamePatterns.cs

@@ -0,0 +1,57 @@
+using Bit.Seeder.Data.Enums;
+
+namespace Bit.Seeder.Data;
+
+internal sealed record UsernamePattern(
+    UsernamePatternType Type,
+    string FormatDescription,
+    Func<string, string, string, string> Generate);
+
+/// <summary>
+/// Username pattern implementations for different email conventions.
+/// </summary>
+internal static class UsernamePatterns
+{
+    public static readonly UsernamePattern FirstDotLast = new(
+        UsernamePatternType.FirstDotLast,
+        "first.last@domain",
+        (first, last, domain) => $"{first.ToLowerInvariant()}.{last.ToLowerInvariant()}@{domain}");
+
+    public static readonly UsernamePattern FDotLast = new(
+        UsernamePatternType.FDotLast,
+        "f.last@domain",
+        (first, last, domain) => $"{char.ToLowerInvariant(first[0])}.{last.ToLowerInvariant()}@{domain}");
+
+    public static readonly UsernamePattern FLast = new(
+        UsernamePatternType.FLast,
+        "flast@domain",
+        (first, last, domain) => $"{char.ToLowerInvariant(first[0])}{last.ToLowerInvariant()}@{domain}");
+
+    public static readonly UsernamePattern LastDotFirst = new(
+        UsernamePatternType.LastDotFirst,
+        "last.first@domain",
+        (first, last, domain) => $"{last.ToLowerInvariant()}.{first.ToLowerInvariant()}@{domain}");
+
+    public static readonly UsernamePattern First_Last = new(
+        UsernamePatternType.First_Last,
+        "first_last@domain",
+        (first, last, domain) => $"{first.ToLowerInvariant()}_{last.ToLowerInvariant()}@{domain}");
+
+    public static readonly UsernamePattern LastFirst = new(
+        UsernamePatternType.LastFirst,
+        "lastf@domain",
+        (first, last, domain) => $"{last.ToLowerInvariant()}{char.ToLowerInvariant(first[0])}@{domain}");
+
+    public static readonly UsernamePattern[] All = [FirstDotLast, FDotLast, FLast, LastDotFirst, First_Last, LastFirst];
+
+    public static UsernamePattern GetPattern(UsernamePatternType type) => type switch
+    {
+        UsernamePatternType.FirstDotLast => FirstDotLast,
+        UsernamePatternType.FDotLast => FDotLast,
+        UsernamePatternType.FLast => FLast,
+        UsernamePatternType.LastDotFirst => LastDotFirst,
+        UsernamePatternType.First_Last => First_Last,
+        UsernamePatternType.LastFirst => LastFirst,
+        _ => FirstDotLast
+    };
+}