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[GH-ISSUE #6018] Bug: hex string expected, got unpadded hex of length 253 #19033

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opened 2026-04-15 17:48:42 -05:00 by GiteaMirror · 2 comments
GiteaMirror commented 2026-04-15 17:48:42 -05:00
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Originally created by @firdausai on GitHub (Nov 16, 2025).
Original GitHub issue: https://github.com/better-auth/better-auth/issues/6018

Originally assigned to: @Paola3stefania on GitHub.

Is this suited for github?

  • Yes, this is suited for github

To Reproduce

  1. I have fork this repo and modified the demo nextjs directory to demonstrate the error this repo. I just added a component so its easier to test this.
  2. Login using Google OAuth
  3. After being redirected to the dashboard on the demo, scroll to the bottom and click the first button with the name 1. Add google drive scope. You can modify this to any other scope that require the access token, but this scope is what I am using on my app
  4. Click the second button with the name 2. Call google drive api (list file). This should result in a success (expected)
  5. Go to auth.ts and change encryptOAuthTokens from False to True
  6. Wait for the access token to be expired
  7. Click the second button with the name 2. Call google drive api (list file) again. This should result in an error
Error fetching OAuth tokens: [Error [APIError]: Failed to get a valid access token] {
  status: 'BAD_REQUEST',
  body: [Object],
  headers: {},
  statusCode: 400,
  [cause]: Error: hex string expected, got unpadded hex of length 253
      at symmetricDecrypt (../../packages/better-auth/dist/crypto-DZW3hrq1.mjs:64:32)
      at async (../../packages/better-auth/dist/api-fDFKThbG.mjs:664:43)
      at async (../../packages/better-auth/dist/api-fDFKThbG.mjs:2870:21)
      at async GET (app/api/token/route.ts:12:29)
    62 | const symmetricDecrypt = async ({ key, data }) => {
    63 | 	const keyAsBytes = await createHash("SHA-256").digest(key);
  > 64 | 	const dataAsBytes = hexToBytes(data);
       | 	                              ^
    65 | 	const chacha = managedNonce(xchacha20poly1305)(new Uint8Array(keyAsBytes));
    66 | 	return new TextDecoder().decode(chacha.decrypt(dataAsBytes));
    67 | };
}

Current vs. Expected behavior

Current:
When changing the encryptOAuthTokens from False to True, getAccessToken function will call the decryptOAuthToken function and the if statement will evaluate to True even though the token is not encrypted. Hence, the error.

Expected Behavior:
Token should be decrypted only if they are encrypted in the first place.

What version of Better Auth are you using?

1.3.34

System info

{
  "system": {
    "platform": "darwin",
    "arch": "arm64",
    "version": "Darwin Kernel Version 23.6.0: Wed Oct 15 21:15:50 PDT 2025; root:xnu-10063.141.1.707.11~1/RELEASE_ARM64_T6000",
    "release": "23.6.0",
    "cpuCount": 10,
    "cpuModel": "Apple M1 Max",
    "totalMemory": "32.00 GB",
    "freeMemory": "0.06 GB"
  },
  "node": {
    "version": "v23.5.0",
    "env": "development"
  },
  "packageManager": {
    "name": "npm",
    "version": "11.5.2"
  },
  "frameworks": null,
  "databases": null,
  "betterAuth": {
    "version": "Unknown",
    "config": null
  }
}

Which area(s) are affected? (Select all that apply)

Package

Auth config (if applicable)

export const auth = betterAuth({
	appName: "Better Auth Demo",
	baseURL,
	database: {
		dialect,
		type: "mysql",
	},
	emailVerification: {
		async sendVerificationEmail({ user, url }) {
			const res = await resend.emails.send({
				from,
				to: to || user.email,
				subject: "Verify your email address",
				html: `<a href="${url}">Verify your email address</a>`,
			});
			console.log(res, user.email);
		},
	},
	account: {
		accountLinking: {
			trustedProviders: ["google", "github", "demo-app", "sso"],
		},
    encryptOAuthTokens: true // After accessTokenExpiresAt expired, change this from `False` to `True`
	},
	emailAndPassword: {
		enabled: true,
		async sendResetPassword({ user, url }) {
			await resend.emails.send({
				from,
				to: user.email,
				subject: "Reset your password",
				react: reactResetPasswordEmail({
					username: user.email,
					resetLink: url,
				}),
			});
		},
	},
	socialProviders: {
		apple: {
			clientId: process.env.APPLE_CLIENT_ID || "",
			clientSecret: process.env.APPLE_CLIENT_SECRET || "",
		},
		facebook: {
			clientId: process.env.FACEBOOK_CLIENT_ID || "",
			clientSecret: process.env.FACEBOOK_CLIENT_SECRET || "",
		},
		github: {
			clientId: process.env.GITHUB_CLIENT_ID || "",
			clientSecret: process.env.GITHUB_CLIENT_SECRET || "",
		},
		google: {
			clientId: process.env.NEXT_PUBLIC_GOOGLE_CLIENT_ID || "",
			clientSecret: process.env.GOOGLE_CLIENT_SECRET || "",
		},
		discord: {
			clientId: process.env.DISCORD_CLIENT_ID || "",
			clientSecret: process.env.DISCORD_CLIENT_SECRET || "",
		},
		microsoft: {
			clientId: process.env.MICROSOFT_CLIENT_ID || "",
			clientSecret: process.env.MICROSOFT_CLIENT_SECRET || "",
		},
		twitch: {
			clientId: process.env.TWITCH_CLIENT_ID || "",
			clientSecret: process.env.TWITCH_CLIENT_SECRET || "",
		},
		twitter: {
			clientId: process.env.TWITTER_CLIENT_ID || "",
			clientSecret: process.env.TWITTER_CLIENT_SECRET || "",
		},
		paypal: {
			clientId: process.env.PAYPAL_CLIENT_ID || "",
			clientSecret: process.env.PAYPAL_CLIENT_SECRET || "",
		},
	},
	plugins: [
		organization({
			async sendInvitationEmail(data) {
				await resend.emails.send({
					from,
					to: data.email,
					subject: "You've been invited to join an organization",
					react: reactInvitationEmail({
						username: data.email,
						invitedByUsername: data.inviter.user.name,
						invitedByEmail: data.inviter.user.email,
						teamName: data.organization.name,
						inviteLink:
							process.env.NODE_ENV === "development"
								? `http://localhost:3000/accept-invitation/${data.id}`
								: `${
										process.env.BETTER_AUTH_URL ||
										"https://demo.better-auth.com"
									}/accept-invitation/${data.id}`,
					}),
				});
			},
		}),
		twoFactor({
			otpOptions: {
				async sendOTP({ user, otp }) {
					await resend.emails.send({
						from,
						to: user.email,
						subject: "Your OTP",
						html: `Your OTP is ${otp}`,
					});
				},
			},
		}),
		passkey(),
		openAPI(),
		bearer(),
		admin({
			adminUserIds: ["EXD5zjob2SD6CBWcEQ6OpLRHcyoUbnaB"],
		}),
		multiSession(),
		oAuthProxy(),
		nextCookies(),
		oneTap(),
		customSession(async (session) => {
			return {
				...session,
				user: {
					...session.user,
					dd: "test",
				},
			};
		}),
		stripe({
			stripeClient: new Stripe(process.env.STRIPE_KEY || "sk_test_"),
			stripeWebhookSecret: process.env.STRIPE_WEBHOOK_SECRET!,
			subscription: {
				enabled: true,
				allowReTrialsForDifferentPlans: true,
				plans: () => {
					const PRO_PRICE_ID = {
						default:
							process.env.STRIPE_PRO_PRICE_ID ??
							"price_1RoxnRHmTADgihIt4y8c0lVE",
						annual:
							process.env.STRIPE_PRO_ANNUAL_PRICE_ID ??
							"price_1RoxnoHmTADgihItzFvVP8KT",
					};
					const PLUS_PRICE_ID = {
						default:
							process.env.STRIPE_PLUS_PRICE_ID ??
							"price_1RoxnJHmTADgihIthZTLmrPn",
						annual:
							process.env.STRIPE_PLUS_ANNUAL_PRICE_ID ??
							"price_1Roxo5HmTADgihItEbJu5llL",
					};

					return [
						{
							name: "Plus",
							priceId: PLUS_PRICE_ID.default,
							annualDiscountPriceId: PLUS_PRICE_ID.annual,
							freeTrial: {
								days: 7,
							},
						},
						{
							name: "Pro",
							priceId: PRO_PRICE_ID.default,
							annualDiscountPriceId: PRO_PRICE_ID.annual,
							freeTrial: {
								days: 7,
							},
						},
					];
				},
			},
		}),
		sso({
			defaultSSO: [
				{
					domain: "http://localhost:3000",
					providerId: "sso",
					samlConfig: {
						issuer: "http://localhost:3000/api/auth/sso/saml2/sp/metadata",
						entryPoint:
							"https://dummyidp.com/apps/app_01k16v4vb5yytywqjjvv2b3435",
						cert: `-----BEGIN CERTIFICATE-----
	  MIIDBzCCAe+gAwIBAgIUCLBK4f75EXEe4gyroYnVaqLoSp4wDQYJKoZIhvcNAQEL
	  BQAwEzERMA8GA1UEAwwIZHVtbXlpZHAwHhcNMjQwNTEzMjE1NDE2WhcNMzQwNTEx
	  MjE1NDE2WjATMREwDwYDVQQDDAhkdW1teWlkcDCCASIwDQYJKoZIhvcNAQEBBQAD
	  ggEPADCCAQoCggEBAKhmgQmWb8NvGhz952XY4SlJlpWIK72RilhOZS9frDYhqWVJ
	  HsGH9Z7sSzrM/0+YvCyEWuZV9gpMeIaHZxEPDqW3RJ7KG51fn/s/qFvwctf+CZDj
	  yfGDzYs+XIgf7p56U48EmYeWpB/aUW64gSbnPqrtWmVFBisOfIx5aY3NubtTsn+g
	  0XbdX0L57+NgSvPQHXh/GPXA7xCIWm54G5kqjozxbKEFA0DS3yb6oHRQWHqIAM/7
	  mJMdUVZNIV1q7c2JIgAl23uDWq+2KTE2R5liP/KjvjwKonVKtTqGqX6ei25rsTHO
	  aDpBH/LdQK2txgsm7R7+IThWNvUI0TttrmwBqyMCAwEAAaNTMFEwHQYDVR0OBBYE
	  FD142gxIAJMhpgMkgpzmRNoW9XbEMB8GA1UdIwQYMBaAFD142gxIAJMhpgMkgpzm
	  RNoW9XbEMA8GA1UdEwEB/wQFMAMBAf8wDQYJKoZIhvcNAQELBQADggEBADQd6k6z
	  FIc20GfGHY5C2MFwyGOmP5/UG/JiTq7Zky28G6D0NA0je+GztzXx7VYDfCfHxLcm
	  2k5t9nYhb9kVawiLUUDVF6s+yZUXA4gUA3KoTWh1/oRxR3ggW7dKYm9fsNOdQAbx
	  UUkzp7HLZ45ZlpKUS0hO7es+fPyF5KVw0g0SrtQWwWucnQMAQE9m+B0aOf+92y7J
	  QkdgdR8Gd/XZ4NZfoOnKV7A1utT4rWxYCgICeRTHx9tly5OhPW4hQr5qOpngcsJ9
	  vhr86IjznQXhfj3hql5lA3VbHW04ro37ROIkh2bShDq5dwJJHpYCGrF3MQv8S3m+
	  jzGhYL6m9gFTm/8=
	  -----END CERTIFICATE-----`,
						spMetadata: {
							metadata: `
				  <md:EntityDescriptor xmlns:md="urn:oasis:names:tc:SAML:2.0:metadata" entityID="http://localhost:3000/api/auth/sso/saml2/sp/metadata">
		  <md:SPSSODescriptor AuthnRequestsSigned="false" WantAssertionsSigned="false" protocolSupportEnumeration="urn:oasis:names:tc:SAML:2.0:protocol">
			  <md:KeyDescriptor use="signing">
			  <ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
				  <ds:X509Data>
				  <ds:X509Certificate>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</ds:X509Certificate>
				  </ds:X509Data>
			  </ds:KeyInfo>
			  </md:KeyDescriptor>
			  <md:KeyDescriptor use="encryption">
			  <ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
				  <ds:X509Data>
				  <ds:X509Certificate>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</ds:X509Certificate>
				  </ds:X509Data>
			  </ds:KeyInfo>
			  </md:KeyDescriptor>
			  <md:SingleLogoutService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect" Location="http://localhost:3000/api/auth/sso/saml2/sp/sls"/>
			  <md:NameIDFormat>urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress</md:NameIDFormat>
			  <md:AssertionConsumerService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" Location="http://localhost:3000/api/auth/sso/saml2/sp/acs/sso" index="1"/>
			  <md:AssertionConsumerService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect" Location="http://localhost:3000/api/auth/sso/saml2/sp/acs/sso" index="1"/>
			  </md:SPSSODescriptor>
		  <md:Organization>
			  <md:OrganizationName xml:lang="en-US">Organization Name</md:OrganizationName>
			  <md:OrganizationDisplayName xml:lang="en-US">Organization DisplayName</md:OrganizationDisplayName>
			  <md:OrganizationURL xml:lang="en-US">http://localhost:3000/</md:OrganizationURL>
		  </md:Organization>
		  <md:ContactPerson contactType="technical">
			  <md:GivenName>Technical Contact Name</md:GivenName>
			  <md:EmailAddress>technical_contact@gmail.com</md:EmailAddress>
		  </md:ContactPerson>
		  <md:ContactPerson contactType="support">
			  <md:GivenName>Support Contact Name</md:GivenName>
			  <md:EmailAddress>support_contact@gmail.com</md:EmailAddress>
		  </md:ContactPerson>
		  </md:EntityDescriptor>
		  `,
						},
						idpMetadata: {
							entityURL:
								"https://dummyidp.com/apps/app_01k16v4vb5yytywqjjvv2b3435/metadata",
							entityID:
								"https://dummyidp.com/apps/app_01k16v4vb5yytywqjjvv2b3435",
							redirectURL:
								"https://dummyidp.com/apps/app_01k16v4vb5yytywqjjvv2b3435/sso",
							singleSignOnService: [
								{
									Binding: "urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect",
									Location:
										"https://dummyidp.com/apps/app_01k16v4vb5yytywqjjvv2b3435/sso",
								},
							],
							cert: `-----BEGIN CERTIFICATE-----
		MIIDBzCCAe+gAwIBAgIUCLBK4f75EXEe4gyroYnVaqLoSp4wDQYJKoZIhvcNAQEL
		BQAwEzERMA8GA1UEAwwIZHVtbXlpZHAwHhcNMjQwNTEzMjE1NDE2WhcNMzQwNTEx
		MjE1NDE2WjATMREwDwYDVQQDDAhkdW1teWlkcDCCASIwDQYJKoZIhvcNAQEBBQAD
		ggEPADCCAQoCggEBAKhmgQmWb8NvGhz952XY4SlJlpWIK72RilhOZS9frDYhqWVJ
		HsGH9Z7sSzrM/0+YvCyEWuZV9gpMeIaHZxEPDqW3RJ7KG51fn/s/qFvwctf+CZDj
		yfGDzYs+XIgf7p56U48EmYeWpB/aUW64gSbnPqrtWmVFBisOfIx5aY3NubtTsn+g
		0XbdX0L57+NgSvPQHXh/GPXA7xCIWm54G5kqjozxbKEFA0DS3yb6oHRQWHqIAM/7
		mJMdUVZNIV1q7c2JIgAl23uDWq+2KTE2R5liP/KjvjwKonVKtTqGqX6ei25rsTHO
		aDpBH/LdQK2txgsm7R7+IThWNvUI0TttrmwBqyMCAwEAAaNTMFEwHQYDVR0OBBYE
		FD142gxIAJMhpgMkgpzmRNoW9XbEMB8GA1UdIwQYMBaAFD142gxIAJMhpgMkgpzm
		RNoW9XbEMA8GA1UdEwEB/wQFMAMBAf8wDQYJKoZIhvcNAQELBQADggEBADQd6k6z
		FIc20GfGHY5C2MFwyGOmP5/UG/JiTq7Zky28G6D0NA0je+GztzXx7VYDfCfHxLcm
		2k5t9nYhb9kVawiLUUDVF6s+yZUXA4gUA3KoTWh1/oRxR3ggW7dKYm9fsNOdQAbx
		UUkzp7HLZ45ZlpKUS0hO7es+fPyF5KVw0g0SrtQWwWucnQMAQE9m+B0aOf+92y7J
		QkdgdR8Gd/XZ4NZfoOnKV7A1utT4rWxYCgICeRTHx9tly5OhPW4hQr5qOpngcsJ9
		vhr86IjznQXhfj3hql5lA3VbHW04ro37ROIkh2bShDq5dwJJHpYCGrF3MQv8S3m+
		jzGhYL6m9gFTm/8=
		-----END CERTIFICATE-----`,
						},
						callbackUrl: "/dashboard",
					},
				},
			],
		}),
		deviceAuthorization({
			expiresIn: "3min",
			interval: "5s",
		}),
		lastLoginMethod(),
	],
	trustedOrigins: ["exp://", "https://appleid.apple.com"],
	advanced: {
		crossSubDomainCookies: {
			enabled: process.env.NODE_ENV === "production",
			domain: cookieDomain,
		},
	},

Additional context

Originally created by @firdausai on GitHub (Nov 16, 2025). Original GitHub issue: https://github.com/better-auth/better-auth/issues/6018 Originally assigned to: @Paola3stefania on GitHub. ### Is this suited for github? - [x] Yes, this is suited for github ### To Reproduce 1. I have fork this repo and modified the demo nextjs directory to demonstrate the error [this repo](https://github.com/firdausai/better-auth/tree/demo/oauth-encryption-bug). I just added a component so its easier to test this. 2. Login using Google OAuth 3. After being redirected to the dashboard on the demo, scroll to the bottom and click the first button with the name `1. Add google drive scope`. You can modify this to any other scope that require the access token, but this scope is what I am using on my app 4. Click the second button with the name `2. Call google drive api (list file)`. This should result in a success (expected) 5. Go to `auth.ts` and change `encryptOAuthTokens` from `False` to `True` 6. Wait for the access token to be expired 7. Click the second button with the name `2. Call google drive api (list file)` again. This should result in an error ``` Error fetching OAuth tokens: [Error [APIError]: Failed to get a valid access token] { status: 'BAD_REQUEST', body: [Object], headers: {}, statusCode: 400, [cause]: Error: hex string expected, got unpadded hex of length 253 at symmetricDecrypt (../../packages/better-auth/dist/crypto-DZW3hrq1.mjs:64:32) at async (../../packages/better-auth/dist/api-fDFKThbG.mjs:664:43) at async (../../packages/better-auth/dist/api-fDFKThbG.mjs:2870:21) at async GET (app/api/token/route.ts:12:29) 62 | const symmetricDecrypt = async ({ key, data }) => { 63 | const keyAsBytes = await createHash("SHA-256").digest(key); > 64 | const dataAsBytes = hexToBytes(data); | ^ 65 | const chacha = managedNonce(xchacha20poly1305)(new Uint8Array(keyAsBytes)); 66 | return new TextDecoder().decode(chacha.decrypt(dataAsBytes)); 67 | }; } ``` ### Current vs. Expected behavior Current: When changing the `encryptOAuthTokens` from `False` to `True`, `getAccessToken` function will call the `decryptOAuthToken` function and the if statement will evaluate to `True` even though the token is not encrypted. Hence, the error. Expected Behavior: Token should be decrypted only if they are encrypted in the first place. ### What version of Better Auth are you using? 1.3.34 ### System info ```bash { "system": { "platform": "darwin", "arch": "arm64", "version": "Darwin Kernel Version 23.6.0: Wed Oct 15 21:15:50 PDT 2025; root:xnu-10063.141.1.707.11~1/RELEASE_ARM64_T6000", "release": "23.6.0", "cpuCount": 10, "cpuModel": "Apple M1 Max", "totalMemory": "32.00 GB", "freeMemory": "0.06 GB" }, "node": { "version": "v23.5.0", "env": "development" }, "packageManager": { "name": "npm", "version": "11.5.2" }, "frameworks": null, "databases": null, "betterAuth": { "version": "Unknown", "config": null } } ``` ### Which area(s) are affected? (Select all that apply) Package ### Auth config (if applicable) ```typescript export const auth = betterAuth({ appName: "Better Auth Demo", baseURL, database: { dialect, type: "mysql", }, emailVerification: { async sendVerificationEmail({ user, url }) { const res = await resend.emails.send({ from, to: to || user.email, subject: "Verify your email address", html: `<a href="${url}">Verify your email address</a>`, }); console.log(res, user.email); }, }, account: { accountLinking: { trustedProviders: ["google", "github", "demo-app", "sso"], }, encryptOAuthTokens: true // After accessTokenExpiresAt expired, change this from `False` to `True` }, emailAndPassword: { enabled: true, async sendResetPassword({ user, url }) { await resend.emails.send({ from, to: user.email, subject: "Reset your password", react: reactResetPasswordEmail({ username: user.email, resetLink: url, }), }); }, }, socialProviders: { apple: { clientId: process.env.APPLE_CLIENT_ID || "", clientSecret: process.env.APPLE_CLIENT_SECRET || "", }, facebook: { clientId: process.env.FACEBOOK_CLIENT_ID || "", clientSecret: process.env.FACEBOOK_CLIENT_SECRET || "", }, github: { clientId: process.env.GITHUB_CLIENT_ID || "", clientSecret: process.env.GITHUB_CLIENT_SECRET || "", }, google: { clientId: process.env.NEXT_PUBLIC_GOOGLE_CLIENT_ID || "", clientSecret: process.env.GOOGLE_CLIENT_SECRET || "", }, discord: { clientId: process.env.DISCORD_CLIENT_ID || "", clientSecret: process.env.DISCORD_CLIENT_SECRET || "", }, microsoft: { clientId: process.env.MICROSOFT_CLIENT_ID || "", clientSecret: process.env.MICROSOFT_CLIENT_SECRET || "", }, twitch: { clientId: process.env.TWITCH_CLIENT_ID || "", clientSecret: process.env.TWITCH_CLIENT_SECRET || "", }, twitter: { clientId: process.env.TWITTER_CLIENT_ID || "", clientSecret: process.env.TWITTER_CLIENT_SECRET || "", }, paypal: { clientId: process.env.PAYPAL_CLIENT_ID || "", clientSecret: process.env.PAYPAL_CLIENT_SECRET || "", }, }, plugins: [ organization({ async sendInvitationEmail(data) { await resend.emails.send({ from, to: data.email, subject: "You've been invited to join an organization", react: reactInvitationEmail({ username: data.email, invitedByUsername: data.inviter.user.name, invitedByEmail: data.inviter.user.email, teamName: data.organization.name, inviteLink: process.env.NODE_ENV === "development" ? `http://localhost:3000/accept-invitation/${data.id}` : `${ process.env.BETTER_AUTH_URL || "https://demo.better-auth.com" }/accept-invitation/${data.id}`, }), }); }, }), twoFactor({ otpOptions: { async sendOTP({ user, otp }) { await resend.emails.send({ from, to: user.email, subject: "Your OTP", html: `Your OTP is ${otp}`, }); }, }, }), passkey(), openAPI(), bearer(), admin({ adminUserIds: ["EXD5zjob2SD6CBWcEQ6OpLRHcyoUbnaB"], }), multiSession(), oAuthProxy(), nextCookies(), oneTap(), customSession(async (session) => { return { ...session, user: { ...session.user, dd: "test", }, }; }), stripe({ stripeClient: new Stripe(process.env.STRIPE_KEY || "sk_test_"), stripeWebhookSecret: process.env.STRIPE_WEBHOOK_SECRET!, subscription: { enabled: true, allowReTrialsForDifferentPlans: true, plans: () => { const PRO_PRICE_ID = { default: process.env.STRIPE_PRO_PRICE_ID ?? "price_1RoxnRHmTADgihIt4y8c0lVE", annual: process.env.STRIPE_PRO_ANNUAL_PRICE_ID ?? "price_1RoxnoHmTADgihItzFvVP8KT", }; const PLUS_PRICE_ID = { default: process.env.STRIPE_PLUS_PRICE_ID ?? "price_1RoxnJHmTADgihIthZTLmrPn", annual: process.env.STRIPE_PLUS_ANNUAL_PRICE_ID ?? "price_1Roxo5HmTADgihItEbJu5llL", }; return [ { name: "Plus", priceId: PLUS_PRICE_ID.default, annualDiscountPriceId: PLUS_PRICE_ID.annual, freeTrial: { days: 7, }, }, { name: "Pro", priceId: PRO_PRICE_ID.default, annualDiscountPriceId: PRO_PRICE_ID.annual, freeTrial: { days: 7, }, }, ]; }, }, }), sso({ defaultSSO: [ { domain: "http://localhost:3000", providerId: "sso", samlConfig: { issuer: "http://localhost:3000/api/auth/sso/saml2/sp/metadata", entryPoint: "https://dummyidp.com/apps/app_01k16v4vb5yytywqjjvv2b3435", cert: `-----BEGIN CERTIFICATE----- MIIDBzCCAe+gAwIBAgIUCLBK4f75EXEe4gyroYnVaqLoSp4wDQYJKoZIhvcNAQEL BQAwEzERMA8GA1UEAwwIZHVtbXlpZHAwHhcNMjQwNTEzMjE1NDE2WhcNMzQwNTEx MjE1NDE2WjATMREwDwYDVQQDDAhkdW1teWlkcDCCASIwDQYJKoZIhvcNAQEBBQAD ggEPADCCAQoCggEBAKhmgQmWb8NvGhz952XY4SlJlpWIK72RilhOZS9frDYhqWVJ HsGH9Z7sSzrM/0+YvCyEWuZV9gpMeIaHZxEPDqW3RJ7KG51fn/s/qFvwctf+CZDj yfGDzYs+XIgf7p56U48EmYeWpB/aUW64gSbnPqrtWmVFBisOfIx5aY3NubtTsn+g 0XbdX0L57+NgSvPQHXh/GPXA7xCIWm54G5kqjozxbKEFA0DS3yb6oHRQWHqIAM/7 mJMdUVZNIV1q7c2JIgAl23uDWq+2KTE2R5liP/KjvjwKonVKtTqGqX6ei25rsTHO aDpBH/LdQK2txgsm7R7+IThWNvUI0TttrmwBqyMCAwEAAaNTMFEwHQYDVR0OBBYE FD142gxIAJMhpgMkgpzmRNoW9XbEMB8GA1UdIwQYMBaAFD142gxIAJMhpgMkgpzm RNoW9XbEMA8GA1UdEwEB/wQFMAMBAf8wDQYJKoZIhvcNAQELBQADggEBADQd6k6z FIc20GfGHY5C2MFwyGOmP5/UG/JiTq7Zky28G6D0NA0je+GztzXx7VYDfCfHxLcm 2k5t9nYhb9kVawiLUUDVF6s+yZUXA4gUA3KoTWh1/oRxR3ggW7dKYm9fsNOdQAbx UUkzp7HLZ45ZlpKUS0hO7es+fPyF5KVw0g0SrtQWwWucnQMAQE9m+B0aOf+92y7J QkdgdR8Gd/XZ4NZfoOnKV7A1utT4rWxYCgICeRTHx9tly5OhPW4hQr5qOpngcsJ9 vhr86IjznQXhfj3hql5lA3VbHW04ro37ROIkh2bShDq5dwJJHpYCGrF3MQv8S3m+ jzGhYL6m9gFTm/8= -----END CERTIFICATE-----`, spMetadata: { metadata: ` <md:EntityDescriptor xmlns:md="urn:oasis:names:tc:SAML:2.0:metadata" entityID="http://localhost:3000/api/auth/sso/saml2/sp/metadata"> <md:SPSSODescriptor AuthnRequestsSigned="false" WantAssertionsSigned="false" protocolSupportEnumeration="urn:oasis:names:tc:SAML:2.0:protocol"> <md:KeyDescriptor use="signing"> <ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#"> <ds:X509Data> <ds:X509Certificate>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</ds:X509Certificate> </ds:X509Data> </ds:KeyInfo> </md:KeyDescriptor> <md:KeyDescriptor use="encryption"> <ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#"> <ds:X509Data> <ds:X509Certificate>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</ds:X509Certificate> </ds:X509Data> </ds:KeyInfo> </md:KeyDescriptor> <md:SingleLogoutService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect" Location="http://localhost:3000/api/auth/sso/saml2/sp/sls"/> <md:NameIDFormat>urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress</md:NameIDFormat> <md:AssertionConsumerService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" Location="http://localhost:3000/api/auth/sso/saml2/sp/acs/sso" index="1"/> <md:AssertionConsumerService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect" Location="http://localhost:3000/api/auth/sso/saml2/sp/acs/sso" index="1"/> </md:SPSSODescriptor> <md:Organization> <md:OrganizationName xml:lang="en-US">Organization Name</md:OrganizationName> <md:OrganizationDisplayName xml:lang="en-US">Organization DisplayName</md:OrganizationDisplayName> <md:OrganizationURL xml:lang="en-US">http://localhost:3000/</md:OrganizationURL> </md:Organization> <md:ContactPerson contactType="technical"> <md:GivenName>Technical Contact Name</md:GivenName> <md:EmailAddress>technical_contact@gmail.com</md:EmailAddress> </md:ContactPerson> <md:ContactPerson contactType="support"> <md:GivenName>Support Contact Name</md:GivenName> <md:EmailAddress>support_contact@gmail.com</md:EmailAddress> </md:ContactPerson> </md:EntityDescriptor> `, }, idpMetadata: { entityURL: "https://dummyidp.com/apps/app_01k16v4vb5yytywqjjvv2b3435/metadata", entityID: "https://dummyidp.com/apps/app_01k16v4vb5yytywqjjvv2b3435", redirectURL: "https://dummyidp.com/apps/app_01k16v4vb5yytywqjjvv2b3435/sso", singleSignOnService: [ { Binding: "urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect", Location: "https://dummyidp.com/apps/app_01k16v4vb5yytywqjjvv2b3435/sso", }, ], cert: `-----BEGIN CERTIFICATE----- MIIDBzCCAe+gAwIBAgIUCLBK4f75EXEe4gyroYnVaqLoSp4wDQYJKoZIhvcNAQEL BQAwEzERMA8GA1UEAwwIZHVtbXlpZHAwHhcNMjQwNTEzMjE1NDE2WhcNMzQwNTEx MjE1NDE2WjATMREwDwYDVQQDDAhkdW1teWlkcDCCASIwDQYJKoZIhvcNAQEBBQAD ggEPADCCAQoCggEBAKhmgQmWb8NvGhz952XY4SlJlpWIK72RilhOZS9frDYhqWVJ HsGH9Z7sSzrM/0+YvCyEWuZV9gpMeIaHZxEPDqW3RJ7KG51fn/s/qFvwctf+CZDj yfGDzYs+XIgf7p56U48EmYeWpB/aUW64gSbnPqrtWmVFBisOfIx5aY3NubtTsn+g 0XbdX0L57+NgSvPQHXh/GPXA7xCIWm54G5kqjozxbKEFA0DS3yb6oHRQWHqIAM/7 mJMdUVZNIV1q7c2JIgAl23uDWq+2KTE2R5liP/KjvjwKonVKtTqGqX6ei25rsTHO aDpBH/LdQK2txgsm7R7+IThWNvUI0TttrmwBqyMCAwEAAaNTMFEwHQYDVR0OBBYE FD142gxIAJMhpgMkgpzmRNoW9XbEMB8GA1UdIwQYMBaAFD142gxIAJMhpgMkgpzm RNoW9XbEMA8GA1UdEwEB/wQFMAMBAf8wDQYJKoZIhvcNAQELBQADggEBADQd6k6z FIc20GfGHY5C2MFwyGOmP5/UG/JiTq7Zky28G6D0NA0je+GztzXx7VYDfCfHxLcm 2k5t9nYhb9kVawiLUUDVF6s+yZUXA4gUA3KoTWh1/oRxR3ggW7dKYm9fsNOdQAbx UUkzp7HLZ45ZlpKUS0hO7es+fPyF5KVw0g0SrtQWwWucnQMAQE9m+B0aOf+92y7J QkdgdR8Gd/XZ4NZfoOnKV7A1utT4rWxYCgICeRTHx9tly5OhPW4hQr5qOpngcsJ9 vhr86IjznQXhfj3hql5lA3VbHW04ro37ROIkh2bShDq5dwJJHpYCGrF3MQv8S3m+ jzGhYL6m9gFTm/8= -----END CERTIFICATE-----`, }, callbackUrl: "/dashboard", }, }, ], }), deviceAuthorization({ expiresIn: "3min", interval: "5s", }), lastLoginMethod(), ], trustedOrigins: ["exp://", "https://appleid.apple.com"], advanced: { crossSubDomainCookies: { enabled: process.env.NODE_ENV === "production", domain: cookieDomain, }, }, ``` ### Additional context
GiteaMirror added the lockedbug labels 2026-04-15 17:48:42 -05:00
GiteaMirror commented 2026-04-15 17:48:44 -05:00
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@dosubot[bot] commented on GitHub (Nov 16, 2025):

This bug happens because when you toggle encryptOAuthTokens from false to true, the code tries to decrypt tokens that were previously stored unencrypted. The decryption function expects a hex string (the encrypted format), but gets a plain token, which triggers the "hex string expected, got unpadded hex" error. There isn't a built-in check to distinguish encrypted from unencrypted tokens before attempting decryption, so toggling the flag on existing data causes this failure.

To fix this, you need logic that only decrypts tokens if they're actually encrypted. A common approach is to store a marker or use a recognizable format for encrypted tokens (for example, prefixing encrypted values), or to migrate all existing tokens to the encrypted format when you enable the flag. Without this, toggling the flag will always risk breaking on legacy data.

If you want a quick workaround, you could add a check before decryption—such as verifying the token matches the expected hex format or length—so only encrypted tokens are passed to the decrypt function. For a robust solution, consider migrating all tokens to the encrypted format when you switch the flag, or add metadata to distinguish encrypted tokens in your database.

The root cause and solution are supported by the code for symmetricDecrypt, which expects a hex string and throws if it gets plaintext instead (source).

To reply, just mention @dosu.

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<!-- gh-comment-id:3538465944 --> @dosubot[bot] commented on GitHub (Nov 16, 2025): <!-- Answer --> This bug happens because when you toggle `encryptOAuthTokens` from false to true, the code tries to decrypt tokens that were previously stored unencrypted. The decryption function expects a hex string (the encrypted format), but gets a plain token, which triggers the "hex string expected, got unpadded hex" error. There isn't a built-in check to distinguish encrypted from unencrypted tokens before attempting decryption, so toggling the flag on existing data causes this failure. To fix this, you need logic that only decrypts tokens if they're actually encrypted. A common approach is to store a marker or use a recognizable format for encrypted tokens (for example, prefixing encrypted values), or to migrate all existing tokens to the encrypted format when you enable the flag. Without this, toggling the flag will always risk breaking on legacy data. If you want a quick workaround, you could add a check before decryption—such as verifying the token matches the expected hex format or length—so only encrypted tokens are passed to the decrypt function. For a robust solution, consider migrating all tokens to the encrypted format when you switch the flag, or add metadata to distinguish encrypted tokens in your database. The root cause and solution are supported by the code for `symmetricDecrypt`, which expects a hex string and throws if it gets plaintext instead ([source](https://github.com/better-auth/better-auth/blob/d768852258d1fea921984196806608af2983a867/packages/better-auth/src/crypto/index.ts#L15-L38)). <!-- Dosu Comment Footer --> *To reply, just mention [@dosu](https://go.dosu.dev/dosubot).* --- <sup>How did I do? [Good](https://app.dosu.dev/response-feedback/b6f22db9-b8a1-4fce-a157-dbbe84ce1cac?feedback_type=great_response) | [Irrelevant](https://app.dosu.dev/response-feedback/b6f22db9-b8a1-4fce-a157-dbbe84ce1cac?feedback_type=irrelevant_answer) | [Incorrect](https://app.dosu.dev/response-feedback/b6f22db9-b8a1-4fce-a157-dbbe84ce1cac?feedback_type=incorrect_sources) | [Verbose](https://app.dosu.dev/response-feedback/b6f22db9-b8a1-4fce-a157-dbbe84ce1cac?feedback_type=too_verbose) | [Hallucination](https://app.dosu.dev/response-feedback/b6f22db9-b8a1-4fce-a157-dbbe84ce1cac?feedback_type=hallucination) | [Report 🐛](https://app.dosu.dev/response-feedback/b6f22db9-b8a1-4fce-a157-dbbe84ce1cac?feedback_type=bug_report) | [Other](https://app.dosu.dev/response-feedback/b6f22db9-b8a1-4fce-a157-dbbe84ce1cac?feedback_type=other)</sup>&nbsp;&nbsp;[![Chat with Dosu](https://dosu.dev/dosu-chat-badge.svg)](https://app.dosu.dev/cdda13d9-dd27-4d31-b09a-5d8bec92de21/ask?utm_source=github)&nbsp;[![Join Discord](https://img.shields.io/badge/join-5865F2?logo=discord&logoColor=white&label=)](https://go.dosu.dev/discord-bot)&nbsp;[![Share on X](https://img.shields.io/badge/X-share-black)](https://twitter.com/intent/tweet?text=%40dosu_ai%20helped%20me%20solve%20this%20issue!&url=https%3A//github.com/better-auth/better-auth/issues/6018)
GiteaMirror commented 2026-04-15 17:48:45 -05:00
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@Paola3stefania commented on GitHub (Jan 7, 2026):

@firdausai looking at this :)

<!-- gh-comment-id:3721104172 --> @Paola3stefania commented on GitHub (Jan 7, 2026): @firdausai looking at this :)
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Reference: github-starred/better-auth#19033
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