106 lines
34 KiB
Plaintext
106 lines
34 KiB
Plaintext
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rust
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�… #rustc 1.96.0 (ac68faa20 2026-05-25)ÁíàÄTËŸ ÜJîÄ)'ß\¥! -3d1337db07d0b3aeÁ hmacÁ襤ÆÂöÇT�é {GØ -b15597c08a36c459Á 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 Ý »À|¾ í
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errorsÁ × × sealedÁ
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SealedÁ .™ . CoreÁ . new_from_sliceÁ . new_coreÁ . from_coreÁ .¥ . finalizeÁ 6™ 6ä 6ï 6„ 6“ 6¥ 6ª >™ >ä >ï >„ >“ >¥ >ª
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SimpleHkdfExtractÁ I™
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SimpleHkdfÁ K™ M™ Mš Mæ M input_ikmÁ Mª S™ Sš S× W™ Wš Wæ W from_prkÁ W extractÁ W expand_multi_infoÁ W expandÁ _™ _š _× HmacImplÁ c™ e™ e¥ InvalidPrkLengthÁ h
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tƒ v× HkdfExtractÁ x™ xš x_ x _pdÁ }™ }š }ƒ HkdfÁ �™ �š �_ �à
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G9v+ 0´ß Ûð Øð ¿cð Äcð .ôô CoreWrapperÁ öí– ÷ bufferÁ– Ó›Øê@°«// HmacCoreÁ 1Œ
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SimpleHmacÁ •ŒY – opad_keyÁY — ipad_keyÁY >Ö�G½pèè Ø x x º
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q GË „ë h HË i Hü ÏH ü ^ [ An implementation of HKDF, the [HMAC-based Extract-and-Expand Key Derivation Function][1].Á _ ú \c # UsageÁ o ú üsN K The most common way to use HKDF is as follows: you provide the Initial KeyÁ üÂT Q Material (IKM) and an optional salt, then you expand it (perhaps multiple times)Á ü—J G into some Output Key Material (OKM) bound to an "info" context string.Á â ú üæ- * There are two usage options for the salt:Á ” ú ü˜C @ - [`None`] or static for domain separation in a private settingÁ üÜL I - guaranteed to be uniformly-distributed and unique in a public settingÁ © ú üB ? Other non fitting data should be added to the `IKM` or `info`.Á ð ú \ô ```rustÁ ¬€ use sha2::Sha256;Á œ– use hkdf::Hkdf;Á ̪ use hex_literal::hex;Á Ä ú üÈC @ let ikm = hex!("0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b");Á üŒ2 / let salt = hex!("000102030405060708090a0b0c");Á ü¿, ) let info = hex!("f0f1f2f3f4f5f6f7f8f9");Á ì ú üð8 5 let hk = Hkdf::<Sha256>::new(Some(&salt[..]), &ikm);Á ä© let mut okm = [0u8; 42];Á ôÆ hk.expand(&info, &mut okm)Á üå= : .expect("42 is a valid length for Sha256 to output");Á £ ú ̧ let expected = hex!("Á üÁ( % 3cb25f25faacd57a90434f64d0362f2aÁ üê( % 2d2d0a90cf1a5a4c5db02d56ecc4c5bfÁ ä“ 34007208d5b887185865Á <° ");Á ü¸ & # assert_eq!(okm[..], expected[..]);Á <ß ```Á ç ú üë G D Normally the PRK (Pseudo-Random Key) remains hidden within the HKDFÁ ü³
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J G object, but if you need to access it, use [`Hkdf::extract`] instead ofÁ ”þ
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[`Hkdf::new`].Á ‘ ú \• ¼ ¼¡ # use sha2::Sha256;Á ¬¹ # use hkdf::Hkdf;Á ÜÏ # use hex_literal::hex;Á üë E B # let ikm = hex!("0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b");Á ü± 4 1 # let salt = hex!("000102030405060708090a0b0c");Á æ ú üê C @ let (prk, hk) = Hkdf::<Sha256>::extract(Some(&salt[..]), &ikm);Á Ì®
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ä üÈ
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( % 077709362c2e32df0ddc3f0dc47bba63Á üñ
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( % 90b6c73bb50f9c3122ec844ad7c2b3e5Á <š �! ü¢& # assert_eq!(prk[..], expected[..]);Á <É Ï! Ñ ú üÕL I If you already have a strong key to work from (uniformly-distributed andÁ ü¢L I long enough), you can save a tiny amount of time by skipping the extractÁ üïC @ step. In this case, you pass a Pseudo-Random Key (PRK) into theÁ ü³J G [`Hkdf::from_prk`] constructor, then use the resulting [`Hkdf`] objectÁ lþ
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as usual.Á Œ ú \� ¼ ¼œ Ã# ¬´ ã# ÜÊ �$ üæ4 õ$ ü›. + # let info = hex!("f0f1f2f3f4f5f6f7f8f9");Á ¤Ê let prk = hex!("Á üß( ˜& üˆ( Ê& <± �! ¹ ú ü½Q N let hk = Hkdf::<Sha256>::from_prk(&prk).expect("PRK should be large enough");Á ä� Å ô¬ ê üË= ’ ‰ ú Ì� ä ü§( ‡ üÐ( ¹ äù ê <– �! üž& ! <Å Ï! Í ú üÑ, ) [1]: https://tools.ietf.org/html/rfc5869Á Dhttps://raw.githubusercontent.com/RustCrypto/media/6ee8e381/logo.svgÁ„ò ¯.l– IKcx�í‰ _˜ ר ` ¹Æ • ¹Æ – êù , ‰
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