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package s3crypto
import (
"encoding/base64"
"strconv"
)
// AESGCMNoPadding is the constant value that is used to specify
// the cek algorithm consiting of AES GCM with no padding.
const AESGCMNoPadding = "AES/GCM/NoPadding"
// AESCBC is the string constant that signifies the AES CBC algorithm cipher.
const AESCBC = "AES/CBC"
func encodeMeta(reader lengthReader, cd CipherData) (Envelope, error) {
iv := base64.StdEncoding.EncodeToString(cd.IV)
key := base64.StdEncoding.EncodeToString(cd.EncryptedKey)
contentLength := reader.GetContentLength()
matdesc, err := cd.MaterialDescription.encodeDescription()
if err != nil {
return Envelope{}, err
}
return Envelope{
CipherKey: key,
IV: iv,
MatDesc: string(matdesc),
WrapAlg: cd.WrapAlgorithm,
CEKAlg: cd.CEKAlgorithm,
TagLen: cd.TagLength,
UnencryptedContentLen: strconv.FormatInt(contentLength, 10),
}, nil
}