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reduce code branching, align return values with sodium-native

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This commit is contained in:
Christophe Diederichs 2020-06-18 11:12:35 +02:00
parent d2d84df55e
commit 5473cafdfe
1 changed files with 13 additions and 25 deletions
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28
crypto_aead.js
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@ -22,13 +22,10 @@ function crypto_aead_chacha20poly1305_ietf_encrypt (c, m, ad, nsec, npub, k) {
"k should be 'crypto_aead_chacha20poly1305_ietf_KEYBYTES' long")
assert(m.byteLength <= crypto_aead_chacha20poly1305_ietf_MESSAGEBYTES_MAX, 'message is too large')
var ret = crypto_aead_chacha20poly1305_ietf_encrypt_detached(c.subarray(0, m.byteLength), c.subarray(m.byteLength), m, ad, nsec, npub, k)
const ret = crypto_aead_chacha20poly1305_ietf_encrypt_detached(c.subarray(0, m.byteLength),
c.subarray(m.byteLength), m, ad, nsec, npub, k)
if (ret === 0) {
return m.byteLength + crypto_aead_chacha20poly1305_ietf_ABYTES
}
throw new Error('could not encrypt data')
return m.byteLength + ret
}
function crypto_aead_chacha20poly1305_ietf_encrypt_detached (c, mac, m, ad, nsec, npub, k) {
@ -67,7 +64,7 @@ function crypto_aead_chacha20poly1305_ietf_encrypt_detached (c, mac, m, ad, nsec
poly.finish(mac, 0)
slen.fill(0)
return 0
return crypto_aead_chacha20poly1305_ietf_ABYTES
}
function crypto_aead_chacha20poly1305_ietf_decrypt (m, nsec, c, ad, npub, k) {
@ -81,23 +78,17 @@ function crypto_aead_chacha20poly1305_ietf_decrypt (m, nsec, c, ad, npub, k) {
"k should be 'crypto_aead_chacha20poly1305_ietf_KEYBYTES' long")
assert(m.byteLength <= crypto_aead_chacha20poly1305_ietf_MESSAGEBYTES_MAX, 'message is too large')
var ret = -1
if (c.byteLength < crypto_aead_chacha20poly1305_ietf_ABYTES) throw new Error('could not verify data')
if (c.byteLength >= crypto_aead_chacha20poly1305_ietf_ABYTES) {
ret = crypto_aead_chacha20poly1305_ietf_decrypt_detached(
crypto_aead_chacha20poly1305_ietf_decrypt_detached(
m, nsec,
c.subarray(0, c.byteLength - crypto_aead_chacha20poly1305_ietf_ABYTES),
c.subarray(c.byteLength - crypto_aead_chacha20poly1305_ietf_ABYTES),
ad, npub, k)
}
if (ret === 0) {
return c.byteLength - crypto_aead_chacha20poly1305_ietf_ABYTES
}
throw new Error('could not verify data')
}
function crypto_aead_chacha20poly1305_ietf_decrypt_detached (m, nsec, c, mac, ad, npub, k) {
if (ad === null) return crypto_aead_chacha20poly1305_ietf_decrypt(m, nsec, c, mac, new Uint8Array(0), npub, k)
@ -113,8 +104,6 @@ function crypto_aead_chacha20poly1305_ietf_decrypt_detached (m, nsec, c, mac, ad
const block0 = new Uint8Array(64)
const slen = new Uint8Array(8)
const computed_mac = new Uint8Array(crypto_aead_chacha20poly1305_ietf_ABYTES)
var mlen
var ret
crypto_stream_chacha20_ietf(block0, npub, k)
const poly = new Poly1305(block0)
@ -123,7 +112,7 @@ function crypto_aead_chacha20poly1305_ietf_decrypt_detached (m, nsec, c, mac, ad
poly.update(ad, 0, ad.byteLength)
poly.update(_pad0, 0, (0x10 - ad.byteLength) & 0xf)
mlen = c.byteLength
const mlen = c.byteLength
poly.update(c, 0, mlen)
poly.update(_pad0, 0, (0x10 - mlen) & 0xf)
@ -136,7 +125,7 @@ function crypto_aead_chacha20poly1305_ietf_decrypt_detached (m, nsec, c, mac, ad
poly.finish(computed_mac, 0)
assert(computed_mac.byteLength === 16)
ret = crypto_verify_16(computed_mac, 0, mac, 0)
const ret = crypto_verify_16(computed_mac, 0, mac, 0)
computed_mac.fill(0)
slen.fill(0)
@ -147,7 +136,6 @@ function crypto_aead_chacha20poly1305_ietf_decrypt_detached (m, nsec, c, mac, ad
}
crypto_stream_chacha20_ietf_xor_ic(m, c, npub, 1, k)
return 0
}
function write64LE (buf, offset, int) {