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-- vim: ft=terra
local const = {
keybits = 2048;
sighash = lib.md.MBEDTLS_MD_SHA256;
}
local err = {
rawcode = terra(code: int)
if code < 0 then code = -code end
return code and 0xFF80
end;
toobig = -lib.pk.MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE;
}
................................................................................
terra m.der(pub: bool, key: &ctx, buf: &uint8): binblob
var ofs: ptrdiff
if pub then
ofs = lib.pk.mbedtls_pk_write_pubkey_der(key, buf, const.maxdersz)
else
ofs = lib.pk.mbedtls_pk_write_key_der(key, buf, const.maxdersz)
end
if ofs < 0 then return binblob.null() end
return binblob {
ptr = buf + (const.maxdersz - ofs);
ct = ofs;
}
end
m.destroy = lib.dispatch {
[ctx] = function(v) return `lib.pk.mbedtls_pk_free(&v) end;
[false] = function(ptr) return `ptr:free() end;
}
terra m.genkp(): lib.pk.mbedtls_pk_context
lib.dbg('generating new keypair')
var pk: ctx
lib.pk.mbedtls_pk_init(&pk)
lib.pk.mbedtls_pk_setup(&pk, lib.pk.mbedtls_pk_info_from_type(lib.pk.MBEDTLS_PK_RSA))
var rsa = [&lib.rsa.mbedtls_rsa_context](pk.pk_ctx)
lib.rsa.mbedtls_rsa_gen_key(rsa, callbacks.randomize, nil, const.keybits, 65537)
return pk
end
local binblob = lib.mem.ptr(uint8)
terra m.loadpriv(buf: binblob): lib.stat(ctx)
lib.dbg('parsing saved private key')
var pk: ctx
lib.pk.mbedtls_pk_init(&pk)
var rt = lib.pk.mbedtls_pk_parse_key(&pk, buf.ptr, buf.ct, nil, 0)
if rt == 0 then
return [lib.stat(ctx)] { ok = true, val = pk }
else
lib.pk.mbedtls_pk_free(&pk)
return [lib.stat(ctx)] { ok = false, error = rt }
end
end
................................................................................
lib.dbg('(1/2) hashing message')
if lib.md.mbedtls_md(lib.md.mbedtls_md_info_from_type(const.sighash), [&uint8](txt), len, hash) ~= 0 then
lib.bail('could not hash message')
end
lib.dbg('(2/2) signing hash')
var ret = lib.pk.mbedtls_pk_sign(pk, const.sighash, hash, 0, [&uint8](sig.ptr), &osz, callbacks.randomize, nil)
if ret ~= 0 then lib.bail('could not sign message hash')
else sig:resize(osz) end
return sig
end
terra m.verify(pk: &ctx, txt: rawstring, len: intptr,
sig: &uint8, siglen: intptr): {bool, uint8}
lib.dbg('verifying signature')
var osz: intptr = 0
var hash: uint8[64]
................................................................................
if lib.pk.mbedtls_pk_verify(pk, hk, hash, 0, [&uint8](sig), siglen) == 0 then
return true, secl
end
end
lib.dbg('all hash algorithms failed')
return false, 0
end
terra m.hmac(alg: hashalg, key: lib.mem.ptr(uint8), txt: lib.mem.ptr(int8), buf: &uint8)
lib.md.mbedtls_md_hmac(
lib.md.mbedtls_md_info_from_type(alg.id),
key.ptr, key.ct,
[&uint8](txt.ptr), txt.ct,
buf) -- sz(buf) >= hash output size
end
................................................................................
for i = 0, len do
a:ppush(words[m.random(intptr,0,[words.type.N])]):lpush '-'
end
a:ipush(m.random(uint32,0,99999))
end
return m
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-- vim: ft=terra
local const = {
keybits = 2048;
sighash = constant(uint32, lib.md.MBEDTLS_MD_SHA256);
}
const.keybits_c = constant(uint32,const.keybits);
local err = {
rawcode = terra(code: int)
if code < 0 then code = -code end
return code and 0xFF80
end;
toobig = -lib.pk.MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE;
}
................................................................................
terra m.der(pub: bool, key: &ctx, buf: &uint8): binblob
var ofs: ptrdiff
if pub then
ofs = lib.pk.mbedtls_pk_write_pubkey_der(key, buf, const.maxdersz)
else
ofs = lib.pk.mbedtls_pk_write_key_der(key, buf, const.maxdersz)
end
if ofs == lib.asn1.MBEDTLS_ERR_ASN1_BUF_TOO_SMALL then
lib.warn("BUG: bad buffer size for lib.crypt.der")
return binblob.null()
elseif ofs == lib.pk.MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE then
lib.warn("mbedtls broken! asymmetric-key crypto unsupported")
return binblob.null()
elseif ofs == lib.pk.MBEDTLS_ERR_RSA_BAD_INPUT_DATA then
lib.warn("bad RSA input to lib.crypt.der")
return binblob.null()
elseif ofs < 0 then
var num: int8[21]
var sz = lib.str.bfmt(num, "%lld", ofs)
lib.warn("unknown MBEDTLS error ", {&num[0], sz});
return binblob.null()
end
return binblob {
ptr = buf + (const.maxdersz - ofs);
ct = ofs;
}
end
m.destroy = lib.dispatch {
[ctx] = function(v) return `lib.pk.mbedtls_pk_free(&v) end;
[false] = function(ptr) return `ptr:free() end;
}
terra m.pk_genrsa(pk: &ctx)
-- fuck you arm for making requiring this inane pipe-through-cat
-- what is wrong with you demented bastards
var noise: uint8[2048]
m.spray(noise,2048)
var rng: lib.drbg.mbedtls_ctr_drbg_context
var entropy: lib.entropy.mbedtls_entropy_context
lib.drbg.mbedtls_ctr_drbg_init(&rng)
lib.entropy.mbedtls_entropy_init(&entropy)
lib.drbg.mbedtls_ctr_drbg_seed(&rng, lib.entropy.mbedtls_entropy_func, &entropy, &noise[0], 2048)
var rsa = lib.pk.pk2rsa(@pk)
lib.rsa.mbedtls_rsa_init(rsa)
var e = lib.rsa.mbedtls_rsa_gen_key(rsa, lib.drbg.mbedtls_ctr_drbg_random, &rng, const.keybits_c, 3)
if e < 0 then
var buf: int8[22]
lib.bail("BUG: could not buf-generate RSA keypair; mbedtls reports error ",
lib.math.decstrs(e, &buf[21]))
end
if lib.rsa.mbedtls_rsa_check_privkey(rsa) < 0 then
lib.bail("BUG: generated bad RSA keypair")
end
end
terra m.genkp(): lib.pk.mbedtls_pk_context
lib.dbg('generating new keypair')
var pk: ctx
lib.pk.mbedtls_pk_init(&pk)
if lib.pk.mbedtls_pk_setup(&pk, lib.pk.mbedtls_pk_info_from_type(lib.pk.MBEDTLS_PK_RSA)) < 0 then
lib.bail 'pk context setup failed'
end
m.pk_genrsa(&pk)
return pk
end
local binblob = lib.mem.ptr(uint8)
terra m.loadpriv(buf: binblob): lib.stat(ctx)
lib.dbg('parsing saved private key')
var pk: ctx
lib.pk.mbedtls_pk_init(&pk)
var rt = lib.pk.mbedtls_pk_parse_key(&pk,
[&uint8](buf.ptr), [intptr](buf.ct),
nil, 0,
callbacks.randomize, nil)
if rt == 0 then
return [lib.stat(ctx)] { ok = true, val = pk }
else
lib.pk.mbedtls_pk_free(&pk)
return [lib.stat(ctx)] { ok = false, error = rt }
end
end
................................................................................
lib.dbg('(1/2) hashing message')
if lib.md.mbedtls_md(lib.md.mbedtls_md_info_from_type(const.sighash), [&uint8](txt), len, hash) ~= 0 then
lib.bail('could not hash message')
end
lib.dbg('(2/2) signing hash')
var ret = lib.pk.mbedtls_pk_sign(pk, const.sighash,
hash, sizeof([hash.type]),
[&uint8](sig.ptr), 2048, &osz,
callbacks.randomize, nil)
if ret ~= 0 then lib.bail('could not sign message hash')
else sig:resize(osz) end
return sig
end
terra m.verify(pk: &ctx, txt: rawstring, len: intptr,
sig: &uint8, siglen: intptr): {bool, uint8}
lib.dbg('verifying signature')
var osz: intptr = 0
var hash: uint8[64]
................................................................................
if lib.pk.mbedtls_pk_verify(pk, hk, hash, 0, [&uint8](sig), siglen) == 0 then
return true, secl
end
end
lib.dbg('all hash algorithms failed')
return false, 0
end
terra m.hmac(alg: hashalg, key: lib.mem.ptr(uint8), txt: lib.mem.ptr(int8), buf: &uint8)
lib.md.mbedtls_md_hmac(
lib.md.mbedtls_md_info_from_type(alg.id),
key.ptr, key.ct,
[&uint8](txt.ptr), txt.ct,
buf) -- sz(buf) >= hash output size
end
................................................................................
for i = 0, len do
a:ppush(words[m.random(intptr,0,[words.type.N])]):lpush '-'
end
a:ipush(m.random(uint32,0,99999))
end
return m
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