use crate::sha256::{encode_core, get_final_chunks_sha, process_chunk};
use futures::io::{AsyncRead, AsyncReadExt};
const H: [u32; 8] = [
0xc1059ed8, 0x367cd507, 0x3070dd17, 0xf70e5939, 0xffc00b31, 0x68581511, 0x64f98fa7, 0xbefa4fa4,
];
pub fn encode(bytes: &[u8]) -> [u8; 28] {
let h: [u32; 8] = encode_core(bytes, H);
let mut hh: [u8; 28] = [0; 28];
for i in 0..7 {
let start_index = i << 2;
hh[start_index..start_index + 4].copy_from_slice(&h[i].to_be_bytes());
}
hh
}
pub async fn encode_async<R>(mut reader: R) -> Result<[u8; 28], std::io::Error>
where
R: AsyncRead + Unpin,
{
let mut h = H;
let mut buffer = [0u8; 64];
let mut buffer_len = 0;
let mut total_length = 0;
loop {
let bytes_read = reader.read(&mut buffer[buffer_len..]).await?;
if bytes_read == 0 {
break;
}
buffer_len += bytes_read;
total_length += bytes_read;
if buffer_len == 64 {
let result =
process_chunk(&buffer[..64], &h);
for i in 0..8 {
h[i] = h[i].wrapping_add(result[i]);
}
buffer_len = 0;
}
}
let final_chunk2 =
get_final_chunks_sha(&mut buffer, total_length, buffer_len);
let result = process_chunk(&buffer, &h);
for i in 0..8 {
h[i] = h[i].wrapping_add(result[i]);
}
if let Some(chunk2) = final_chunk2 {
let result = process_chunk(&chunk2, &h);
for i in 0..8 {
h[i] = h[i].wrapping_add(result[i]);
}
}
let mut hh: [u8; 28] = [0; 28];
for i in 0..7 {
let start_index = i << 2;
hh[start_index..start_index + 4].copy_from_slice(&h[i].to_be_bytes());
}
Ok(hh)
}
#[cfg(test)]
mod tests {
use super::*;
#[tokio::test]
async fn test_encode_empty_string() {
let result = encode_async("".as_bytes()).await.unwrap();
assert_eq!(
result,
[
0xd1, 0x4a, 0x02, 0x8c, 0x2a, 0x3a, 0x2b, 0xc9, 0x47, 0x61, 0x02, 0xbb, 0x28, 0x82,
0x34, 0xc4, 0x15, 0xa2, 0xb0, 0x1f, 0x82, 0x8e, 0xa6, 0x2a, 0xc5, 0xb3, 0xe4, 0x2f
]
);
}
#[tokio::test]
async fn test_encode_abc() {
let result = encode_async("abc".as_bytes()).await.unwrap();
assert_eq!(
result,
[
0x23, 0x09, 0x7D, 0x22, 0x34, 0x05, 0xD8, 0x22, 0x86, 0x42, 0xA4, 0x77, 0xBD, 0xA2,
0x55, 0xB3, 0x2A, 0xAD, 0xBC, 0xE4, 0xBD, 0xA0, 0xB3, 0xF7, 0xE3, 0x6C, 0x9D, 0xA7
]
);
}
#[tokio::test]
async fn test_encode_message_digest() {
let result = encode_async("message digest".as_bytes()).await.unwrap();
assert_eq!(
result,
[
0x2c, 0xb2, 0x1c, 0x83, 0xae, 0x2f, 0x00, 0x4d, 0xe7, 0xe8, 0x1c, 0x3c, 0x70, 0x19,
0xcb, 0xcb, 0x65, 0xb7, 0x1a, 0xb6, 0x56, 0xb2, 0x2d, 0x6d, 0x0c, 0x39, 0xb8, 0xeb
]
);
}
#[tokio::test]
async fn test_encode_abcdefghijklmnopqrstuvwxyz() {
let result = encode_async("abcdefghijklmnopqrstuvwxyz".as_bytes()).await.unwrap();
assert_eq!(
result,
[
0x45, 0xa5, 0xf7, 0x2c, 0x39, 0xc5, 0xcf, 0xf2, 0x52, 0x2e, 0xb3, 0x42, 0x97, 0x99,
0xe4, 0x9e, 0x5f, 0x44, 0xb3, 0x56, 0xef, 0x92, 0x6b, 0xcf, 0x39, 0x0d, 0xcc, 0xc2
]
);
}
#[tokio::test]
async fn test_encode_alphanumeric_string() {
let result = encode_async("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789".as_bytes()).await.unwrap();
assert_eq!(
result,
[
0xbf, 0xf7, 0x2b, 0x4f, 0xcb, 0x7d, 0x75, 0xe5, 0x63, 0x29, 0x00, 0xac, 0x5f, 0x90,
0xd2, 0x19, 0xe0, 0x5e, 0x97, 0xa7, 0xbd, 0xe7, 0x2e, 0x74, 0x0d, 0xb3, 0x93, 0xd9
]
);
}
#[tokio::test]
async fn test_encode_abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq() {
let result = encode_async("abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq".as_bytes()).await.unwrap();
assert_eq!(
result,
[
0x75, 0x38, 0x8B, 0x16, 0x51, 0x27, 0x76, 0xCC, 0x5D, 0xBA, 0x5D, 0xA1, 0xFD, 0x89,
0x01, 0x50, 0xB0, 0xC6, 0x45, 0x5C, 0xB4, 0xF5, 0x8B, 0x19, 0x52, 0x52, 0x25, 0x25
]
);
}
#[tokio::test]
async fn test_encode_million_a() {
let result = encode_async(vec!["a".as_bytes()[0]; 1000000].as_slice()).await.unwrap();
assert_eq!(
result,
[
0x20, 0x79, 0x46, 0x55, 0x98, 0x0C, 0x91, 0xD8, 0xBB, 0xB4, 0xC1, 0xEA, 0x97, 0x61,
0x8A, 0x4B, 0xF0, 0x3F, 0x42, 0x58, 0x19, 0x48, 0xB2, 0xEE, 0x4E, 0xE7, 0xAD, 0x67
]
);
}
#[tokio::test]
async fn test_encode_repeated_pattern() {
let result = encode_async(
vec!["01234567012345670123456701234567"; 20]
.join("")
.as_bytes(),
).await.unwrap();
assert_eq!(
result,
[
0x56, 0x7F, 0x69, 0xF1, 0x68, 0xCD, 0x78, 0x44, 0xE6, 0x52, 0x59, 0xCE, 0x65, 0x8F,
0xE7, 0xAA, 0xDF, 0xA2, 0x52, 0x16, 0xE6, 0x8E, 0xCA, 0x0E, 0xB7, 0xAB, 0x82, 0x62
]
);
}
#[tokio::test]
async fn test_encode_single_byte_07() {
let result = encode_async([0x07].as_slice()).await.unwrap();
assert_eq!(
result,
[
0x00, 0xEC, 0xD5, 0xF1, 0x38, 0x42, 0x2B, 0x8A, 0xD7, 0x4C, 0x97, 0x99, 0xFD, 0x82,
0x6C, 0x53, 0x1B, 0xAD, 0x2F, 0xCA, 0xBC, 0x74, 0x50, 0xBE, 0xE2, 0xAA, 0x8C, 0x2A
]
);
}
#[tokio::test]
async fn test_encode_16_byte_array() {
let result = encode_async([
0x18, 0x80, 0x40, 0x05, 0xdd, 0x4f, 0xbd, 0x15, 0x56, 0x29, 0x9d, 0x6f, 0x9d, 0x93,
0xdf, 0x62,
].as_slice()).await.unwrap();
assert_eq!(
result,
[
0xDF, 0x90, 0xD7, 0x8A, 0xA7, 0x88, 0x21, 0xC9, 0x9B, 0x40, 0xBA, 0x4C, 0x96, 0x69,
0x21, 0xAC, 0xCD, 0x8F, 0xFB, 0x1E, 0x98, 0xAC, 0x38, 0x8E, 0x56, 0x19, 0x1D, 0xB1
]
);
}
#[tokio::test]
async fn test_encode_large_byte_array() {
let result = encode_async([
0x55, 0xb2, 0x10, 0x07, 0x9c, 0x61, 0xb5, 0x3a, 0xdd, 0x52, 0x06, 0x22, 0xd1, 0xac,
0x97, 0xd5, 0xcd, 0xbe, 0x8c, 0xb3, 0x3a, 0xa0, 0xae, 0x34, 0x45, 0x17, 0xbe, 0xe4,
0xd7, 0xba, 0x09, 0xab, 0xc8, 0x53, 0x3c, 0x52, 0x50, 0x88, 0x7a, 0x43, 0xbe, 0xbb,
0xac, 0x90, 0x6c, 0x2e, 0x18, 0x37, 0xf2, 0x6b, 0x36, 0xa5, 0x9a, 0xe3, 0xbe, 0x78,
0x14, 0xd5, 0x06, 0x89, 0x6b, 0x71, 0x8b, 0x2a, 0x38, 0x3e, 0xcd, 0xac, 0x16, 0xb9,
0x61, 0x25, 0x55, 0x3f, 0x41, 0x6f, 0xf3, 0x2c, 0x66, 0x74, 0xc7, 0x45, 0x99, 0xa9,
0x00, 0x53, 0x86, 0xd9, 0xce, 0x11, 0x12, 0x24, 0x5f, 0x48, 0xee, 0x47, 0x0d, 0x39,
0x6c, 0x1e, 0xd6, 0x3b, 0x92, 0x67, 0x0c, 0xa5, 0x6e, 0xc8, 0x4d, 0xee, 0xa8, 0x14,
0xb6, 0x13, 0x5e, 0xca, 0x54, 0x39, 0x2b, 0xde, 0xdb, 0x94, 0x89, 0xbc, 0x9b, 0x87,
0x5a, 0x8b, 0xaf, 0x0d, 0xc1, 0xae, 0x78, 0x57, 0x36, 0x91, 0x4a, 0xb7, 0xda, 0xa2,
0x64, 0xbc, 0x07, 0x9d, 0x26, 0x9f, 0x2c, 0x0d, 0x7e, 0xdd, 0xd8, 0x10, 0xa4, 0x26,
0x14, 0x5a, 0x07, 0x76, 0xf6, 0x7c, 0x87, 0x82, 0x73,
].as_slice()).await.unwrap();
assert_eq!(
result,
[
0x0B, 0x31, 0x89, 0x4E, 0xC8, 0x93, 0x7A, 0xD9, 0xB9, 0x1B, 0xDF, 0xBC, 0xBA, 0x29,
0x4D, 0x9A, 0xDE, 0xFA, 0xA1, 0x8E, 0x09, 0x30, 0x5E, 0x9F, 0x20, 0xD5, 0xC3, 0xA4
]
);
}
}