1 files changed, 65 insertions, 0 deletions
diff --git a/vendor/base64ct/src/alphabet/shacrypt.rs b/vendor/base64ct/src/alphabet/shacrypt.rs
new file mode 100644
index 000000000..ef8d362f9
--- /dev/null
+++ b/vendor/base64ct/src/alphabet/shacrypt.rs
@@ -0,0 +1,65 @@
+//! `crypt(3)` Base64 encoding for sha* family.
+
+use super::{Alphabet, DecodeStep, EncodeStep};
+
+/// `crypt(3)` Base64 encoding for the following schemes.
+///  * sha1_crypt,
+///  * sha256_crypt,
+///  * sha512_crypt,
+///  * md5_crypt
+///
+/// ```text
+/// [.-9]      [A-Z]      [a-z]
+/// 0x2e-0x39, 0x41-0x5a, 0x61-0x7a
+/// ```
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+pub struct Base64ShaCrypt;
+
+impl Alphabet for Base64ShaCrypt {
+    const BASE: u8 = b'.';
+
+    const DECODER: &'static [DecodeStep] = &[
+        DecodeStep::Range(b'.'..=b'9', -45),
+        DecodeStep::Range(b'A'..=b'Z', -52),
+        DecodeStep::Range(b'a'..=b'z', -58),
+    ];
+
+    const ENCODER: &'static [EncodeStep] =
+        &[EncodeStep::Apply(b'9', 7), EncodeStep::Apply(b'Z', 6)];
+
+    const PADDED: bool = false;
+
+    type Unpadded = Self;
+
+    #[inline(always)]
+    fn decode_3bytes(src: &[u8], dst: &mut [u8]) -> i16 {
+        debug_assert_eq!(src.len(), 4);
+        debug_assert!(dst.len() >= 3, "dst too short: {}", dst.len());
+
+        let c0 = Self::decode_6bits(src[0]);
+        let c1 = Self::decode_6bits(src[1]);
+        let c2 = Self::decode_6bits(src[2]);
+        let c3 = Self::decode_6bits(src[3]);
+
+        dst[0] = (c0 | ((c1 & 0x3) << 6)) as u8;
+        dst[1] = ((c1 >> 2) | ((c2 & 0xF) << 4)) as u8;
+        dst[2] = ((c2 >> 4) | (c3 << 2)) as u8;
+
+        ((c0 | c1 | c2 | c3) >> 8) & 1
+    }
+
+    #[inline(always)]
+    fn encode_3bytes(src: &[u8], dst: &mut [u8]) {
+        debug_assert_eq!(src.len(), 3);
+        debug_assert!(dst.len() >= 4, "dst too short: {}", dst.len());
+
+        let b0 = src[0] as i16;
+        let b1 = src[1] as i16;
+        let b2 = src[2] as i16;
+
+        dst[0] = Self::encode_6bits(b0 & 63);
+        dst[1] = Self::encode_6bits(((b1 << 2) | (b0 >> 6)) & 63);
+        dst[2] = Self::encode_6bits(((b2 << 4) | (b1 >> 4)) & 63);
+        dst[3] = Self::encode_6bits(b2 >> 2);
+    }
+}