46 lines
1.4 KiB
V
46 lines
1.4 KiB
V
module blowfish
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pub struct Blowfish {
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pub mut:
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p [18]u32
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s [4][256]u32
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}
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// new_cipher creates and returns a new Blowfish cipher.
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// The key argument should be the Blowfish key, from 1 to 56 bytes.
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pub fn new_cipher(key []byte) ?Blowfish {
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mut bf := Blowfish{}
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unsafe { vmemcpy(&bf.p[0], &p[0], int(sizeof(bf.p))) }
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unsafe { vmemcpy(&bf.s[0], &s[0], int(sizeof(bf.s))) }
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if key.len < 1 || key.len > 56 {
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return error('invalid key')
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}
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expand_key(key, mut bf)
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return bf
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}
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// new_salted_cipher returns a new Blowfish cipher that folds a salt into its key schedule.
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pub fn new_salted_cipher(key []byte, salt []byte) ?Blowfish {
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if salt.len == 0 {
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return new_cipher(key)
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}
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mut bf := Blowfish{}
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unsafe { vmemcpy(&bf.p[0], &p[0], int(sizeof(bf.p))) }
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unsafe { vmemcpy(&bf.s[0], &s[0], int(sizeof(bf.s))) }
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if key.len < 1 {
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return error('invalid key')
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}
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expand_key_with_salt(key, salt, mut bf)
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return bf
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}
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// encrypt encrypts the 8-byte buffer src using the key k and stores the result in dst.
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pub fn (mut bf Blowfish) encrypt(mut dst []byte, src []byte) {
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l := u32(src[0]) << 24 | u32(src[1]) << 16 | u32(src[2]) << 8 | u32(src[3])
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r := u32(src[4]) << 24 | u32(src[5]) << 16 | u32(src[6]) << 8 | u32(src[7])
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arr := setup_tables(l, r, mut bf)
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dst[0], dst[1], dst[2], dst[3] = byte(arr[0] >> 24), byte(arr[0] >> 16), byte(arr[0] >> 8), byte(arr[0])
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dst[4], dst[5], dst[6], dst[7] = byte(arr[1] >> 24), byte(arr[1] >> 16), byte(arr[1] >> 8), byte(arr[1])
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}
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