43 lines
884 B
Go
43 lines
884 B
Go
package deezer
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import (
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"crypto/aes"
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"crypto/cipher"
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"fmt"
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)
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func zeroPad(data []byte) []byte {
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bs := aes.BlockSize
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padded := make([]byte, len(data)+(bs-len(data)%bs)%bs)
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copy(padded, data)
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return padded
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}
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func ecbEncrypt(key, data []byte) ([]byte, error) {
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return ecbTransform(key, data, (cipher.Block).Encrypt)
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}
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func ecbDecrypt(key, data []byte) ([]byte, error) {
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return ecbTransform(key, data, (cipher.Block).Decrypt)
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}
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func ecbTransform(key, data []byte, op func(cipher.Block, []byte, []byte)) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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bs := block.BlockSize()
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if len(data)%bs != 0 {
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return nil, fmt.Errorf("data length %d is not a multiple of the AES block size", len(data))
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}
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out := make([]byte, len(data))
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for i := 0; i < len(data); i += bs {
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op(block, out[i:i+bs], data[i:i+bs])
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}
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return out, nil
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}
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