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crypto: Refactor to move files out of the top level directory

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Currently the top level directory contains basically all of the code
for the crypto package. This PR moves the crypto code into submodules
in a similar manner to what `golang/x/crypto` does. This improves code
organization.

Ref discussion: https://github.com/tendermint/tendermint/pull/1966

Closes #1956
This commit is contained in:
ValarDragon
2018-07-18 08:38:44 -07:00
parent bbf2bd1d81
commit 99e582d79a
119 changed files with 1842 additions and 2174 deletions
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88
libs/common/random.go
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@ -11,9 +11,13 @@ const (
strChars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" // 62 characters
)
// pseudo random number generator.
// seeded with OS randomness (crand)
// Rand is a prng, that is seeded with OS randomness.
// The OS randomness is obtained from crypto/rand, however none of the provided
// methods are suitable for cryptographic usage.
// They all utilize math/rand's prng internally.
//
// All of the methods here are suitable for concurrent use.
// This is achieved by using a mutex lock on all of the provided methods.
type Rand struct {
sync.Mutex
rand *mrand.Rand
@ -105,18 +109,6 @@ func RandInt63n(n int64) int64 {
return grand.Int63n(n)
}
func RandUint16Exp() uint16 {
return grand.Uint16Exp()
}
func RandUint32Exp() uint32 {
return grand.Uint32Exp()
}
func RandUint64Exp() uint64 {
return grand.Uint64Exp()
}
func RandFloat32() float32 {
return grand.Float32()
}
@ -150,8 +142,7 @@ func (r *Rand) Seed(seed int64) {
r.Unlock()
}
// Constructs an alphanumeric string of given length.
// It is not safe for cryptographic usage.
// Str constructs a random alphanumeric string of given length.
func (r *Rand) Str(length int) string {
chars := []byte{}
MAIN_LOOP:
@ -175,12 +166,10 @@ MAIN_LOOP:
return string(chars)
}
// It is not safe for cryptographic usage.
func (r *Rand) Uint16() uint16 {
return uint16(r.Uint32() & (1<<16 - 1))
}
// It is not safe for cryptographic usage.
func (r *Rand) Uint32() uint32 {
r.Lock()
u32 := r.rand.Uint32()
@ -188,12 +177,10 @@ func (r *Rand) Uint32() uint32 {
return u32
}
// It is not safe for cryptographic usage.
func (r *Rand) Uint64() uint64 {
return uint64(r.Uint32())<<32 + uint64(r.Uint32())
}
// It is not safe for cryptographic usage.
func (r *Rand) Uint() uint {
r.Lock()
i := r.rand.Int()
@ -201,22 +188,18 @@ func (r *Rand) Uint() uint {
return uint(i)
}
// It is not safe for cryptographic usage.
func (r *Rand) Int16() int16 {
return int16(r.Uint32() & (1<<16 - 1))
}
// It is not safe for cryptographic usage.
func (r *Rand) Int32() int32 {
return int32(r.Uint32())
}
// It is not safe for cryptographic usage.
func (r *Rand) Int64() int64 {
return int64(r.Uint64())
}
// It is not safe for cryptographic usage.
func (r *Rand) Int() int {
r.Lock()
i := r.rand.Int()
@ -224,7 +207,6 @@ func (r *Rand) Int() int {
return i
}
// It is not safe for cryptographic usage.
func (r *Rand) Int31() int32 {
r.Lock()
i31 := r.rand.Int31()
@ -232,7 +214,6 @@ func (r *Rand) Int31() int32 {
return i31
}
// It is not safe for cryptographic usage.
func (r *Rand) Int31n(n int32) int32 {
r.Lock()
i31n := r.rand.Int31n(n)
@ -240,7 +221,6 @@ func (r *Rand) Int31n(n int32) int32 {
return i31n
}
// It is not safe for cryptographic usage.
func (r *Rand) Int63() int64 {
r.Lock()
i63 := r.rand.Int63()
@ -248,7 +228,6 @@ func (r *Rand) Int63() int64 {
return i63
}
// It is not safe for cryptographic usage.
func (r *Rand) Int63n(n int64) int64 {
r.Lock()
i63n := r.rand.Int63n(n)
@ -256,43 +235,6 @@ func (r *Rand) Int63n(n int64) int64 {
return i63n
}
// Distributed pseudo-exponentially to test for various cases
// It is not safe for cryptographic usage.
func (r *Rand) Uint16Exp() uint16 {
bits := r.Uint32() % 16
if bits == 0 {
return 0
}
n := uint16(1 << (bits - 1))
n += uint16(r.Int31()) & ((1 << (bits - 1)) - 1)
return n
}
// Distributed pseudo-exponentially to test for various cases
// It is not safe for cryptographic usage.
func (r *Rand) Uint32Exp() uint32 {
bits := r.Uint32() % 32
if bits == 0 {
return 0
}
n := uint32(1 << (bits - 1))
n += uint32(r.Int31()) & ((1 << (bits - 1)) - 1)
return n
}
// Distributed pseudo-exponentially to test for various cases
// It is not safe for cryptographic usage.
func (r *Rand) Uint64Exp() uint64 {
bits := r.Uint32() % 64
if bits == 0 {
return 0
}
n := uint64(1 << (bits - 1))
n += uint64(r.Int63()) & ((1 << (bits - 1)) - 1)
return n
}
// It is not safe for cryptographic usage.
func (r *Rand) Float32() float32 {
r.Lock()
f32 := r.rand.Float32()
@ -300,7 +242,6 @@ func (r *Rand) Float32() float32 {
return f32
}
// It is not safe for cryptographic usage.
func (r *Rand) Float64() float64 {
r.Lock()
f64 := r.rand.Float64()
@ -308,13 +249,12 @@ func (r *Rand) Float64() float64 {
return f64
}
// It is not safe for cryptographic usage.
func (r *Rand) Time() time.Time {
return time.Unix(int64(r.Uint64Exp()), 0)
return time.Unix(int64(r.Uint64()), 0)
}
// RandBytes returns n random bytes from the OS's source of entropy ie. via crypto/rand.
// It is not safe for cryptographic usage.
// Bytes returns n random bytes generated from the internal
// prng.
func (r *Rand) Bytes(n int) []byte {
// cRandBytes isn't guaranteed to be fast so instead
// use random bytes generated from the internal PRNG
@ -325,9 +265,8 @@ func (r *Rand) Bytes(n int) []byte {
return bs
}
// RandIntn returns, as an int, a non-negative pseudo-random number in [0, n).
// Intn returns, as an int, a uniform pseudo-random number in the range [0, n).
// It panics if n <= 0.
// It is not safe for cryptographic usage.
func (r *Rand) Intn(n int) int {
r.Lock()
i := r.rand.Intn(n)
@ -335,8 +274,7 @@ func (r *Rand) Intn(n int) int {
return i
}
// RandPerm returns a pseudo-random permutation of n integers in [0, n).
// It is not safe for cryptographic usage.
// Perm returns a pseudo-random permutation of n integers in [0, n).
func (r *Rand) Perm(n int) []int {
r.Lock()
perm := r.rand.Perm(n)