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0.1.2-beta Hozzáadva: 2026. nov. 8. 2:53 · Beépített: 2026. nov. 7. 19:32

protect.rs Hozzáadva: Nem rögzített dátum 7,6 KB · 220 sorok

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1//! Historical IDEA/CFB and LibrePGP V5 secret-packet framing. V6 is untouched.

2use super::{key::Key, wire::*};

3use crate::core::error::CoreResult;

4use bytes::BytesMut;

5use pgp::{

6 crypto::{aead::AeadAlgorithm, hash::HashAlgorithm, sym::SymmetricKeyAlgorithm as Cipher},

7 ser::Serialize,

8 types::StringToKey,

9};

10use rand::RngCore;

11use subtle::ConstantTimeEq;

12use zeroize::{Zeroize, Zeroizing};

13struct WipeBuffer(BytesMut);

14impl Drop for WipeBuffer {

15 fn drop(&mut self) {

16 self.0.as_mut().zeroize();

17 }

18}

19fn cipher(id: u8) -> CoreResult<Cipher> {

20 if ![1, 2, 3, 4, 7, 8, 9, 10, 11, 12, 13].contains(&id) {

21 return Err(invalid());

22 }

23 Ok(Cipher::from(id))

24}

25fn s2k(reader: &mut Reader) -> CoreResult<StringToKey> {

26 let id = *reader.rest().first().ok_or_else(invalid)?;

27 let len = match id {

28 0 => 2,

29 1 => 10,

30 3 => 11,

31 _ => return Err(invalid()),

32 };

33 let bytes = reader.take(len)?;

34 if ![1, 2, 3, 8, 9, 10, 11].contains(&bytes[1]) {

35 return Err(invalid());

36 }

37 crypto(StringToKey::try_from_reader(std::io::Cursor::new(bytes)))

38}

39fn legacy_cfb(

40 data: &[u8],

41 key: &[u8],

42 iv: &[u8],

43 algorithm: Cipher,

44 encrypt: bool,

45) -> CoreResult<Zeroizing<Vec<u8>>> {

46 let mut r = Reader::new(data);

47 let mut out = Zeroizing::new(Vec::with_capacity(data.len()));

48 let mut feedback = Zeroizing::new(iv.to_vec());

49 for _ in 0..4 {

50 let bits = r.u16()?;

51 let source = r.take((bits as usize).div_ceil(8))?;

52 let mut value = Zeroizing::new(source.to_vec());

53 if encrypt {

54 crypto(algorithm.encrypt_with_iv_regular(key, &feedback, &mut value))?;

55 } else {

56 crypto(algorithm.decrypt_with_iv_regular(key, &feedback, &mut value))?;

57 }

58 // Resynchronization aligns each MPI, retaining the last block of ciphertext.

59 let ciphertext = if encrypt { value.as_slice() } else { source };

60 let mut next = Zeroizing::new(feedback.to_vec());

61 next.extend(ciphertext);

62 let n = next.len();

63 feedback.copy_from_slice(&next[n - iv.len()..]);

64 out.extend(bits.to_be_bytes());

65 out.extend(value.as_slice());

66 }

67 r.done()?;

68 Ok(out)

69}

70pub fn seal(key: &Key, plain: &[u8], password: &str, secret_tag: u8) -> CoreResult<Packet> {

71 let mut body = Zeroizing::new(key.public.clone());

72 if password.is_empty() {

73 body.push(0);

74 if key.version == 5 {

75 body.push(0);

76 body.extend((plain.len() as u32).to_be_bytes());

77 }

78 body.extend(plain);

79 body.extend(checksum(plain));

80 } else if key.version <= 3 {

81 let algorithm = Cipher::IDEA;

82 let derived = StringToKey::Simple {

83 hash_alg: HashAlgorithm::Md5,

84 }

85 .derive_key(password.as_bytes(), 16)

86 .map_err(|_| invalid())?;

87 let mut iv = [0u8; 8];

88 rand::thread_rng().fill_bytes(&mut iv);

89 body.push(1);

90 body.extend(iv);

91 body.extend(legacy_cfb(plain, derived.as_ref(), &iv, algorithm, true)?.as_slice());

92 body.extend(checksum(plain));

93 } else {

94 let algorithm = Cipher::AES256;

95 let mut salt = [0u8; 8];

96 rand::thread_rng().fill_bytes(&mut salt);

97 let s2k = StringToKey::IteratedAndSalted {

98 hash_alg: HashAlgorithm::Sha256,

99 salt,

100 count: 224,

101 };

102 // V5 usage 254 is the interoperable LibrePGP secret format. AES-256 CFB

103 // protects the parameter bytes and their SHA-1 integrity checksum; S2K uses SHA-256.

104 let derived = crypto(s2k.derive_key(password.as_bytes(), 32))?;

105 let mut iv = [0u8; 16];

106 rand::thread_rng().fill_bytes(&mut iv);

107 let mut encrypted = Zeroizing::new(Vec::with_capacity(plain.len() + 20));

108 encrypted.extend(plain);

109 encrypted.extend(hash(2, &[plain])?);

110 crypto(algorithm.encrypt_with_iv_regular(derived.as_ref(), &iv, &mut encrypted))?;

111 let mut parameters = vec![9];

112 parameters.extend(crypto(s2k.to_bytes())?);

113 parameters.extend(iv);

114 body.extend([254, parameters.len() as u8]);

115 body.extend(parameters);

116 body.extend((encrypted.len() as u32).to_be_bytes());

117 body.extend(encrypted.as_slice());

118 }

119 Ok(Packet {

120 tag: secret_tag,

121 body,

122 })

123}

124pub fn open(key: &Key, password: &str) -> CoreResult<Zeroizing<Vec<u8>>> {

125 let bytes = key.secret.as_ref().ok_or_else(invalid)?;

126 let mut r = Reader::new(bytes);

127 let usage = r.u8()?;

128 if key.version <= 3 {

129 if usage == 0 {

130 if r.rest().len() < 2 {

131 return Err(invalid());

132 }

133 let n = r.rest().len() - 2;

134 let plain = r.take(n)?;

135 let expected = r.take(2)?;

136 if !bool::from(checksum(plain).ct_eq(expected)) {

137 return Err(invalid());

138 }

139 return Ok(Zeroizing::new(plain.to_vec()));

140 }

141 let algorithm = cipher(usage)?;

142 let iv = r.take(algorithm.block_size())?;

143 if r.rest().len() < 2 {

144 return Err(invalid());

145 }

146 let n = r.rest().len() - 2;

147 let encrypted = r.take(n)?;

148 let expected = r.take(2)?;

149 let derived = crypto(

150 StringToKey::Simple {

151 hash_alg: HashAlgorithm::Md5,

152 }

153 .derive_key(password.as_bytes(), algorithm.key_size()),

154 )?;

155 let plain = legacy_cfb(encrypted, derived.as_ref(), iv, algorithm, false)?;

156 if !bool::from(checksum(&plain).ct_eq(expected)) {

157 return Err(invalid());

158 }

159 return Ok(plain);

160 }

161 let count = r.u8()? as usize;

162 let mut params = Reader::new(r.take(count)?);

163 if usage == 0 {

164 params.done()?;

165 let n = r.u32()? as usize;

166 let plain = r.take(n)?;

167 let expected = r.take(2)?;

168 r.done()?;

169 if !bool::from(checksum(plain).ct_eq(expected)) {

170 return Err(invalid());

171 }

172 return Ok(Zeroizing::new(plain.to_vec()));

173 }

174 if ![253, 254].contains(&usage) {

175 return Err(invalid());

176 }

177 let algorithm = cipher(params.u8()?)?;

178 if ![Cipher::AES128, Cipher::AES192, Cipher::AES256].contains(&algorithm) {

179 return Err(invalid());

180 }

181 if usage == 253 && params.u8()? != 2 {

182 return Err(invalid());

183 }

184 let derivation = s2k(&mut params)?;

185 let iv = params.take(algorithm.block_size())?;

186 params.done()?;

187 let n = r.u32()? as usize;

188 let encrypted = r.take(n)?;

189 r.done()?;

190 let derived = crypto(derivation.derive_key(password.as_bytes(), algorithm.key_size()))?;

191 if usage == 253 {

192 if encrypted.len() < 16 || iv.len() != 16 || iv[15] != 0 {

193 return Err(invalid());

194 }

195 let mut associated = vec![0xc0 | key.tag, algorithm.into(), 2];

196 associated.extend(&key.public);

197 let mut buffer = WipeBuffer(BytesMut::with_capacity(encrypted.len()));

198 buffer.0.extend_from_slice(encrypted);

199 crypto(AeadAlgorithm::Ocb.decrypt_in_place(

200 &algorithm,

201 derived.as_ref(),

202 &iv[..15],

203 &associated,

204 &mut buffer.0,

205 ))?;

206 return Ok(Zeroizing::new(buffer.0.to_vec()));

207 }

208 let mut plain = Zeroizing::new(encrypted.to_vec());

209 crypto(algorithm.decrypt_with_iv_regular(derived.as_ref(), iv, &mut plain))?;

210 if plain.len() < 20 {

211 return Err(invalid());

212 }

213 let n = plain.len() - 20;

214 let digest = hash(2, &[&plain[..n]])?;

215 if !bool::from(digest.ct_eq(&plain[n..])) {

216 return Err(invalid());

217 }

218 plain.truncate(n);

219 Ok(plain)

220}

221

SHA-256

874c27ba2b17c8b68308114a2ef62d9b5876b48a0e5a1933a587a5a87a4c1333

CH-J Proprietary Software License 1.14 · A forrás a CH-J Proprietary Software License 1.14 alatt található. Rendelkezése nem változtatja meg a licenc feltételeit, és nem ad további jogokat.

Archive SHA-256

ac8fe790f4ba60fc098f8c985fc2656cfcc6cdc21fb34b30e308a2b54e62258f

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