35 lines
1.1 KiB
Go
35 lines
1.1 KiB
Go
// Package subtle contains subtly insecure methods not recommended for casual
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// use.
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package subtle
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import (
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"crypto/aes"
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"crypto/cipher"
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"golang.org/x/crypto/scrypt"
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)
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// EncryptWithoutIntegrity encrypts data with AES-CTR. Note: this encryption
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// mode is not secure when stored/sent on an untrusted medium.
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func EncryptWithoutIntegrity(key, input, iv []byte) (output []byte, err error) {
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var block cipher.Block
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if block, err = aes.NewCipher(key); err != nil {
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return
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}
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output = make([]byte, len(input))
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stream := cipher.NewCTR(block, iv)
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stream.XORKeyStream(output, input)
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return
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}
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// DecryptWithoutIntegrity decrypts data encrypted with AES-CTR.
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func DecryptWithoutIntegrity(key, input, iv []byte) ([]byte, error) {
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// AES-CTR decryption is identical to encryption.
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return EncryptWithoutIntegrity(key, input, iv)
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}
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// DeriveKey derives a key from a password using scrypt. n should be set to the
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// highest power of 2 you can derive within 100 milliseconds.
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func DeriveKey(password string, salt []byte, n int) ([]byte, error) {
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return scrypt.Key([]byte(password), salt, n, 8, 1, 32)
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}
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