diff options
Diffstat (limited to 'third_party/rust/ohttp/src/rh/hkdf.rs')
| -rw-r--r-- | third_party/rust/ohttp/src/rh/hkdf.rs | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/third_party/rust/ohttp/src/rh/hkdf.rs b/third_party/rust/ohttp/src/rh/hkdf.rs new file mode 100644 index 0000000000..aeb3a8d6e8 --- /dev/null +++ b/third_party/rust/ohttp/src/rh/hkdf.rs @@ -0,0 +1,224 @@ +#![allow(dead_code)] // TODO: remove + +use super::SymKey; +use crate::{ + err::{Error, Res}, + hpke::{Aead, Kdf}, +}; +use hkdf::Hkdf as HkdfImpl; +use log::trace; +use sha2::{Sha256, Sha384, Sha512}; + +#[derive(Clone, Copy)] +pub enum KeyMechanism { + Aead(Aead), + #[allow(dead_code)] // We don't use this one. + Hkdf, +} + +impl KeyMechanism { + fn len(self) -> usize { + match self { + Self::Aead(a) => a.n_k(), + Self::Hkdf => 0, // Let the underlying module decide. + } + } +} + +pub enum Hkdf { + Sha256, + Sha384, + Sha512, +} + +impl Hkdf { + pub fn new(kdf: Kdf) -> Self { + match kdf { + Kdf::HkdfSha256 => Self::Sha256, + Kdf::HkdfSha384 => Self::Sha384, + Kdf::HkdfSha512 => Self::Sha512, + } + } + + #[cfg(test)] + #[allow(clippy::unnecessary_wraps)] + pub fn import_ikm(ikm: &[u8]) -> Res<SymKey> { + Ok(SymKey::from(ikm)) + } + + #[allow(clippy::unnecessary_wraps)] + pub fn extract(&self, salt: &[u8], ikm: &SymKey) -> Res<SymKey> { + let prk = match self { + Self::Sha256 => { + SymKey::from(HkdfImpl::<Sha256>::extract(Some(salt), &ikm.0).0.as_slice()) + } + Self::Sha384 => { + SymKey::from(HkdfImpl::<Sha384>::extract(Some(salt), &ikm.0).0.as_slice()) + } + Self::Sha512 => { + SymKey::from(HkdfImpl::<Sha512>::extract(Some(salt), &ikm.0).0.as_slice()) + } + }; + trace!( + "HKDF extract: salt={} ikm={:?} prk={:?}", + hex::encode(salt), + ikm, + prk + ); + Ok(prk) + } + + pub fn expand_key(&self, prk: &SymKey, info: &[u8], key_mech: KeyMechanism) -> Res<SymKey> { + let okm = SymKey::from(self.expand_data(prk, info, key_mech.len())?); + trace!( + "HKDF expand_key: prk={:?} info={} okm={:?}", + prk, + hex::encode(info), + okm, + ); + Ok(okm) + } + + pub fn expand_data(&self, prk: &SymKey, info: &[u8], len: usize) -> Res<Vec<u8>> { + let mut okm = vec![0; len]; + match self { + Self::Sha256 => { + let h = HkdfImpl::<Sha256>::from_prk(&prk.0).map_err(|_| Error::Internal)?; + h.expand(info, &mut okm).map_err(|_| Error::Internal)?; + } + Self::Sha384 => { + let h = HkdfImpl::<Sha384>::from_prk(&prk.0).map_err(|_| Error::Internal)?; + h.expand(info, &mut okm).map_err(|_| Error::Internal)?; + } + Self::Sha512 => { + let h = HkdfImpl::<Sha512>::from_prk(&prk.0).map_err(|_| Error::Internal)?; + h.expand(info, &mut okm).map_err(|_| Error::Internal)?; + } + } + trace!( + "HKDF expand_data: prk={:?} info={} len={} okm={:?}", + prk, + hex::encode(info), + len, + hex::encode(&okm), + ); + Ok(okm) + } +} + +#[cfg(test)] +mod test { + use super::{super::super::hpke::Kdf, Hkdf}; + use crate::init; + + fn sha256_example( + ikm: &[u8], + salt: &[u8], + info: &[u8], + l: usize, + expected_prk: &[u8], + expected_okm: &[u8], + ) { + init(); + let hkdf = Hkdf::new(Kdf::HkdfSha256); + let k_ikm = Hkdf::import_ikm(ikm).unwrap(); + let prk = hkdf.extract(salt, &k_ikm).unwrap(); + let prk_data = prk.key_data().unwrap(); + assert_eq!(prk_data, expected_prk); + + let out = hkdf.expand_data(&prk, info, l).unwrap(); + assert_eq!(&out[..], expected_okm); + } + + /// Example 1 from <https://tools.ietf.org/html/rfc5869#appendix-A.1> + #[test] + fn example1() { + const IKM: &[u8] = &[ + 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, + 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, + ]; + const SALT: &[u8] = &[ + 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, + ]; + const INFO: &[u8] = &[0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9]; + const L: usize = 42; + const PRK: &[u8] = &[ + 0x07, 0x77, 0x09, 0x36, 0x2c, 0x2e, 0x32, 0xdf, 0x0d, 0xdc, 0x3f, 0x0d, 0xc4, 0x7b, + 0xba, 0x63, 0x90, 0xb6, 0xc7, 0x3b, 0xb5, 0x0f, 0x9c, 0x31, 0x22, 0xec, 0x84, 0x4a, + 0xd7, 0xc2, 0xb3, 0xe5, + ]; + const OKM: &[u8] = &[ + 0x3c, 0xb2, 0x5f, 0x25, 0xfa, 0xac, 0xd5, 0x7a, 0x90, 0x43, 0x4f, 0x64, 0xd0, 0x36, + 0x2f, 0x2a, 0x2d, 0x2d, 0x0a, 0x90, 0xcf, 0x1a, 0x5a, 0x4c, 0x5d, 0xb0, 0x2d, 0x56, + 0xec, 0xc4, 0xc5, 0xbf, 0x34, 0x00, 0x72, 0x08, 0xd5, 0xb8, 0x87, 0x18, 0x58, 0x65, + ]; + sha256_example(IKM, SALT, INFO, L, PRK, OKM); + } + + /// Example 2 from <https://tools.ietf.org/html/rfc5869#appendix-A.2> + #[test] + fn example2() { + const IKM: &[u8] = &[ + 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, + 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, + 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, + 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, + 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, + 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, + ]; + const SALT: &[u8] = &[ + 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, + 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, + 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, + 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, + 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, + 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, + ]; + const INFO: &[u8] = &[ + 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, + 0xbe, 0xbf, 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, + 0xcc, 0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, + 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, + 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, + 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, + ]; + const L: usize = 82; + const PRK: &[u8] = &[ + 0x06, 0xa6, 0xb8, 0x8c, 0x58, 0x53, 0x36, 0x1a, 0x06, 0x10, 0x4c, 0x9c, 0xeb, 0x35, + 0xb4, 0x5c, 0xef, 0x76, 0x00, 0x14, 0x90, 0x46, 0x71, 0x01, 0x4a, 0x19, 0x3f, 0x40, + 0xc1, 0x5f, 0xc2, 0x44, + ]; + const OKM: &[u8] = &[ + 0xb1, 0x1e, 0x39, 0x8d, 0xc8, 0x03, 0x27, 0xa1, 0xc8, 0xe7, 0xf7, 0x8c, 0x59, 0x6a, + 0x49, 0x34, 0x4f, 0x01, 0x2e, 0xda, 0x2d, 0x4e, 0xfa, 0xd8, 0xa0, 0x50, 0xcc, 0x4c, + 0x19, 0xaf, 0xa9, 0x7c, 0x59, 0x04, 0x5a, 0x99, 0xca, 0xc7, 0x82, 0x72, 0x71, 0xcb, + 0x41, 0xc6, 0x5e, 0x59, 0x0e, 0x09, 0xda, 0x32, 0x75, 0x60, 0x0c, 0x2f, 0x09, 0xb8, + 0x36, 0x77, 0x93, 0xa9, 0xac, 0xa3, 0xdb, 0x71, 0xcc, 0x30, 0xc5, 0x81, 0x79, 0xec, + 0x3e, 0x87, 0xc1, 0x4c, 0x01, 0xd5, 0xc1, 0xf3, 0x43, 0x4f, 0x1d, 0x87, + ]; + sha256_example(IKM, SALT, INFO, L, PRK, OKM); + } + + /// Example 3 from <https://tools.ietf.org/html/rfc5869#appendix-A.3> + #[test] + fn example3() { + const IKM: &[u8] = &[ + 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, + 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, + ]; + const SALT: &[u8] = &[]; + const INFO: &[u8] = &[]; + const L: usize = 42; + const PRK: &[u8] = &[ + 0x19, 0xef, 0x24, 0xa3, 0x2c, 0x71, 0x7b, 0x16, 0x7f, 0x33, 0xa9, 0x1d, 0x6f, 0x64, + 0x8b, 0xdf, 0x96, 0x59, 0x67, 0x76, 0xaf, 0xdb, 0x63, 0x77, 0xac, 0x43, 0x4c, 0x1c, + 0x29, 0x3c, 0xcb, 0x04, + ]; + const OKM: &[u8] = &[ + 0x8d, 0xa4, 0xe7, 0x75, 0xa5, 0x63, 0xc1, 0x8f, 0x71, 0x5f, 0x80, 0x2a, 0x06, 0x3c, + 0x5a, 0x31, 0xb8, 0xa1, 0x1f, 0x5c, 0x5e, 0xe1, 0x87, 0x9e, 0xc3, 0x45, 0x4e, 0x5f, + 0x3c, 0x73, 0x8d, 0x2d, 0x9d, 0x20, 0x13, 0x95, 0xfa, 0xa4, 0xb6, 0x1a, 0x96, 0xc8, + ]; + sha256_example(IKM, SALT, INFO, L, PRK, OKM); + } +} |