From 10ee2acdd26a7f1298c6f6d6b7af9b469fe29b87 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sat, 4 May 2024 14:41:41 +0200
Subject: Merging upstream version 1.70.0+dfsg2.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 vendor/pasetors/src/common.rs | 97 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 vendor/pasetors/src/common.rs

(limited to 'vendor/pasetors/src/common.rs')

diff --git a/vendor/pasetors/src/common.rs b/vendor/pasetors/src/common.rs
new file mode 100644
index 000000000..b95583f62
--- /dev/null
+++ b/vendor/pasetors/src/common.rs
@@ -0,0 +1,97 @@
+use crate::errors::Error;
+use crate::token::private::Purpose;
+use crate::token::UntrustedToken;
+use crate::version::private::Version;
+use alloc::string::String;
+use alloc::vec::Vec;
+use ct_codecs::{Base64UrlSafeNoPadding, Decoder, Encoder};
+use subtle::ConstantTimeEq;
+
+/// Encode bytes with Base64 URL-safe and no padding.
+pub(crate) fn encode_b64<T: AsRef<[u8]>>(bytes: T) -> Result<String, Error> {
+    let inlen = bytes.as_ref().len();
+    let mut buf = vec![0u8; Base64UrlSafeNoPadding::encoded_len(inlen)?];
+
+    let ret: String = Base64UrlSafeNoPadding::encode_to_str(&mut buf, bytes)?.into();
+
+    Ok(ret)
+}
+
+/// Decode string with Base64 URL-safe and no padding.
+pub(crate) fn decode_b64<T: AsRef<[u8]>>(encoded: T) -> Result<Vec<u8>, Error> {
+    let inlen = encoded.as_ref().len();
+    // We can use encoded len here, even if it returns more than needed,
+    // because ct-codecs allows this.
+    let mut buf = vec![0u8; Base64UrlSafeNoPadding::encoded_len(inlen)?];
+
+    let ret: Vec<u8> = Base64UrlSafeNoPadding::decode(&mut buf, encoded, None)?.into();
+
+    Ok(ret)
+}
+
+/// If a footer is present, this is validated against the supplied.
+pub(crate) fn validate_footer_untrusted_token<T: Purpose<V>, V: Version>(
+    token: &UntrustedToken<T, V>,
+    footer: Option<&[u8]>,
+) -> Result<(), Error> {
+    // A known footer was supplied for comparison.
+    if let Some(known_footer) = footer {
+        if token.untrusted_footer().is_empty() {
+            // If one was supplied, one must exist in the untrusted.
+            return Err(Error::TokenValidation);
+        }
+
+        if !bool::from(known_footer.ct_eq(token.untrusted_footer())) {
+            return Err(Error::TokenValidation);
+        }
+    }
+
+    Ok(())
+}
+
+#[cfg(test)]
+pub(crate) mod tests {
+    use alloc::string::String;
+    use alloc::vec::Vec;
+    use serde::{Deserialize, Serialize};
+    use serde_json::Value;
+
+    #[allow(non_snake_case)]
+    #[derive(Serialize, Deserialize, Debug)]
+    pub(crate) struct TestFile {
+        pub(crate) name: String,
+        pub(crate) tests: Vec<PasetoTest>,
+    }
+
+    #[allow(non_snake_case)]
+    #[derive(Serialize, Deserialize, Debug)]
+    pub(crate) struct PasetoTest {
+        pub(crate) name: String,
+        #[serde(rename(deserialize = "expect-fail"))]
+        pub(crate) expect_fail: bool,
+        pub(crate) key: Option<String>,
+        pub(crate) nonce: Option<String>,
+        #[serde(rename(deserialize = "public-key"))]
+        pub(crate) public_key: Option<String>,
+        #[serde(rename(deserialize = "secret-key"))]
+        pub(crate) secret_key: Option<String>,
+        #[serde(rename(deserialize = "secret-key-seed"))]
+        pub(crate) secret_key_seed: Option<String>,
+        #[serde(rename(deserialize = "public-key-pem"))]
+        pub(crate) public_key_pem: Option<String>,
+        #[serde(rename(deserialize = "secret-key-pem"))]
+        pub(crate) secret_key_pem: Option<String>,
+        pub(crate) token: String,
+        pub(crate) payload: Option<Value>,
+        pub(crate) footer: String,
+        #[serde(rename(deserialize = "implicit-assertion"))]
+        pub(crate) implicit_assertion: String,
+    }
+
+    #[allow(non_snake_case)]
+    #[derive(Serialize, Deserialize, Debug)]
+    pub(crate) struct Payload {
+        pub(crate) data: String,
+        pub(crate) exp: String,
+    }
+}
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