171 lines
30 KiB
Plaintext
171 lines
30 KiB
Plaintext
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rust
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ix #rustc 1.96.0 (ac68faa20 2026-05-25)ÁíàÄTËŸ ÜJîÄ)'ß\¥! -3d1337db07d0b3aeÁ digestÁ¶þ°*‹ óz긮°Ñˆ* -8124c3906c1a7855Á
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crypto_commonÁMy› ¤íJÇ;&‰îíW^ö -807a0dbc2f77ddb7Á
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generic_arrayÁç"„wÑÒÕµµ¥;è -1fbbe396c4d2fae7Á typenumÁ/-;@ú¨_z,Ö -6209550d9c65d0a6Á ¤°ð ¾ä-±($²ï=©Ã -7e98a21bfd32b0edÁ block_bufferÁl²>O;-bsò D’¶ Á -fa8e2dfb5eb7e256Á subtleÁÞ Os&¡A ¹]ujO -cb07c5ee900298efÁ ‰ À ´ »À|• í optimÁ
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!
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HmacÁ -•
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HmacCoreÁ /• /_ / opad_digestÁ / ipad_digestÁ
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update_blocksÁ
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P• P resetÁ
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finalize_intoÁ Y‚• ‚× Y…• …ä Yˆ• ˆ finalize_into_resetÁ
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IPADÁ OPADÁ get_der_keyÁ ‘• Y
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SimpleHmacÁ “• “_ “ opad_keyÁ “ ipad_keyÁ Y ˜• ˜ƒ 6
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BlockSizeUserÁl„ DigestÁ4˜ ¢ �$Ì - Œ¡DÒ / �� Tí “ Žü ¬$ ü L I Generic implementation of Hash-based Message Authentication Code (HMAC).Á M ú üQN K To use it you will need a cryptographic hash function implementation whichÁ ü J G implements the [`digest`] crate traits. You can find compatible cratesÁ üë< 9 (e.g. [`sha2`]) in the [`RustCrypto/hashes`] repository.Á ¨ ú ü¬L I This crate provides two HMAC implementation [`Hmac`] and [`SimpleHmac`].Á üùH E The first one is a buffered wrapper around block-level [`HmacCore`].Á üÂJ G Internally it uses efficient state representation, but works only withÁ ü�J G hash functions which expose block-level API and consume blocks eagerlyÁ üØF C (e.g. it will not work with the BLAKE2 family of hash functions).Á üŸJ G On the other hand, [`SimpleHmac`] is a bit less efficient memory-wise,Á üêK H but works with all hash functions which implement the [`Digest`] trait.Á ¶ ú tº # ExamplesÁ üÉG D Let us demonstrate how to use HMAC using the SHA-256 hash function.Á ‘ ú ü•N K In the following examples [`Hmac`] is interchangeable with [`SimpleHmac`].Á ä ú üè To get authentication code:Á ˆ ú \Œ ```rustÁ ¬˜ use sha2::Sha256;Á Ô® use hmac::{Hmac, Mac};Á ÌÉ use hex_literal::hex;Á ã ú üç# // Create alias for HMAC-SHA256Á ü‹ # type HmacSha256 = Hmac<Sha256>;Á ¯ ú ü³ I F let mut mac = HmacSha256::new_from_slice(b"my secret and secure key")Á üý 1 . .expect("HMAC can take key of any size");Á ü¯
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! mac.update(b"input message");Á Ñ
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K H // `result` has type `CtOutput` which is a thin wrapper around array ofÁ ü¡ 7 4 // bytes for providing constant time equality checkÁ üÙ let result = mac.finalize();Á üú F C // To get underlying array use `into_bytes`, but be careful, sinceÁ üÁ N K // incorrect use of the code value may permit timing attacks which defeatsÁ ü�
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. + // the security provided by the `CtOutput`Á ü¿
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) & let code_bytes = result.into_bytes();Á Ìé
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let expected = hex!("Á üƒ( % 97d2a569059bbcd8ead4444ff99071f4Á ü¬( % c01d005bcefe0d3567e1be628e5fdcd9Á <Õ ");Á üÝ- * assert_eq!(code_bytes[..], expected[..]);Á <‹ ```Á “ ú Ô— To verify the message:Á ² ú \¶ • ¼Â # use sha2::Sha256;Á äÚ # use hmac::{Hmac, Mac};Á Ü÷ # use hex_literal::hex;Á ü“% " # type HmacSha256 = Hmac<Sha256>;Á ü¹I ÿ üƒ1 Ò µ ú ü¹! � Û ú Üß let code_bytes = hex!("Á üû( ¹# ü¤( ë# <Í œ$ üÕX U // `verify_slice` will return `Ok(())` if code is correct, `Err(MacError)` otherwiseÁ ü®/ , mac.verify_slice(&code_bytes[..]).unwrap();Á <Þ ã$ æ ú Üê # Block and input sizesÁ ü†P M Usually it is assumed that block size is larger than output size. Due to theÁ ü×P M generic nature of the implementation, this edge case must be handled as wellÁ ü¨Q N to remove potential panic. This is done by truncating hash output to the hashÁ Ìú block size if needed.Á ” ú ü˜& # [`digest`]: https://docs.rs/digestÁ ü¿" [`sha2`]: https://docs.rs/sha2Á üâ? < [`RustCrypto/hashes`]: https://github.com/RustCrypto/hashesÁ Dhttps://raw.githubusercontent.com/RustCrypto/media/26acc39f/logo.svgÁ„– œ-lº https://docs.rs/hmac/0.12.1Álõ
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