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crypto.blowfish: add doc comments for the public API (#12609)

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Taillook
2021-11-30 05:19:52 +09:00
committed by GitHub
parent 14424100e8
commit bbc47562b3
2 changed files with 21 additions and 12 deletions
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27
vlib/crypto/blowfish/block.v
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@@ -1,5 +1,6 @@
module blowfish
// expand_key performs a key expansion on the given Blowfish cipher.
pub fn expand_key(key []byte, mut bf Blowfish) {
mut j := 0
for i := 0; i < 18; i++ {
@@ -17,28 +18,29 @@ pub fn expand_key(key []byte, mut bf Blowfish) {
mut l := u32(0)
mut r := u32(0)
for i := 0; i < 18; i += 2 {
arr := encrypt_block(l, r, mut bf)
arr := setup_tables(l, r, mut bf)
bf.p[i], bf.p[i + 1] = arr[0], arr[1]
}
for i := 0; i < 256; i += 2 {
arr := encrypt_block(l, r, mut bf)
arr := setup_tables(l, r, mut bf)
bf.s[0][i], bf.s[0][i + 1] = arr[0], arr[1]
}
for i := 0; i < 256; i += 2 {
arr := encrypt_block(l, r, mut bf)
arr := setup_tables(l, r, mut bf)
bf.s[1][i], bf.s[1][i + 1] = arr[0], arr[1]
}
for i := 0; i < 256; i += 2 {
arr := encrypt_block(l, r, mut bf)
arr := setup_tables(l, r, mut bf)
bf.s[2][i], bf.s[2][i + 1] = arr[0], arr[1]
}
for i := 0; i < 256; i += 2 {
arr := encrypt_block(l, r, mut bf)
arr := setup_tables(l, r, mut bf)
bf.s[3][i], bf.s[3][i + 1] = arr[0], arr[1]
}
}
// expand_key_with_salt using salt to expand the key.
pub fn expand_key_with_salt(key []byte, salt []byte, mut bf Blowfish) {
mut j := 0
for i := 0; i < 18; i++ {
@@ -52,37 +54,38 @@ pub fn expand_key_with_salt(key []byte, salt []byte, mut bf Blowfish) {
for i := 0; i < 18; i += 2 {
l ^= get_next_word(key, &j)
r ^= get_next_word(key, &j)
arr := encrypt_block(l, r, mut bf)
arr := setup_tables(l, r, mut bf)
bf.p[i], bf.p[i + 1] = arr[0], arr[1]
}
for i := 0; i < 256; i += 2 {
l ^= get_next_word(key, &j)
r ^= get_next_word(key, &j)
arr := encrypt_block(l, r, mut bf)
arr := setup_tables(l, r, mut bf)
bf.s[0][i], bf.s[0][i + 1] = arr[0], arr[1]
}
for i := 0; i < 256; i += 2 {
l ^= get_next_word(key, &j)
r ^= get_next_word(key, &j)
arr := encrypt_block(l, r, mut bf)
arr := setup_tables(l, r, mut bf)
bf.s[1][i], bf.s[1][i + 1] = arr[0], arr[1]
}
for i := 0; i < 256; i += 2 {
l ^= get_next_word(key, &j)
r ^= get_next_word(key, &j)
arr := encrypt_block(l, r, mut bf)
arr := setup_tables(l, r, mut bf)
bf.s[2][i], bf.s[2][i + 1] = arr[0], arr[1]
}
for i := 0; i < 256; i += 2 {
l ^= get_next_word(key, &j)
r ^= get_next_word(key, &j)
arr := encrypt_block(l, r, mut bf)
arr := setup_tables(l, r, mut bf)
bf.s[3][i], bf.s[3][i + 1] = arr[0], arr[1]
}
}
fn encrypt_block(l u32, r u32, mut bf Blowfish) []u32 {
// setup_tables sets up the Blowfish cipher's pi and substitution tables.
fn setup_tables(l u32, r u32, mut bf Blowfish) []u32 {
mut xl := l
mut xr := r
xl ^= bf.p[0]
@@ -123,6 +126,8 @@ fn encrypt_block(l u32, r u32, mut bf Blowfish) []u32 {
return res
}
// get_next_word returns the next big-endian u32 value from the byte
// slice at the given position in a circular manner, updating the position.
fn get_next_word(b []byte, pos &int) u32 {
mut w := u32(0)
mut j := 0