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decrypt.go
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decrypt.go
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package transit
import (
"context"
"encoding/base64"
"github.com/PumpkinSeed/heimdall/internal/errors"
)
func (t Transit) Decrypt(ctx context.Context, key, engineName string, req BatchRequestItem) (DecryptBatchResponseItem, error) {
if req.Ciphertext == "" {
return DecryptBatchResponseItem{}, errors.New("missing ciphertext to decrypt", errors.CodePkgCryptoTransitDecryptCiphertextFormat)
}
var err error
// Decode the context
if len(req.Context) != 0 {
req.DecodedContext, err = base64.StdEncoding.DecodeString(req.Context)
if err != nil {
return DecryptBatchResponseItem{}, errors.Wrap(err, "transit decrypt decode context not base64", errors.CodePkgCryptoTransitDecryptDecodeContextFormat)
}
}
// Decode the nonce
if len(req.Nonce) != 0 {
req.DecodedNonce, err = base64.StdEncoding.DecodeString(req.Nonce)
if err != nil {
return DecryptBatchResponseItem{}, errors.Wrap(err, "transit decrypt nonce not base64", errors.CodePkgCryptoTransitDecryptNonceFormat)
}
}
p, err := t.GetKey(ctx, key, engineName)
if err != nil {
return DecryptBatchResponseItem{}, errors.Wrap(err, "transit encrypt get key error", errors.CodePkgCryptoTransitDecryptGetKey)
}
if p == nil {
return DecryptBatchResponseItem{}, errors.Newf(errors.CodePkgCryptoTransitDecryptPolicyNotFound, "transit encrypt missing policy for key %s", key)
}
plaintext, err := p.Decrypt(req.DecodedContext, req.DecodedNonce, req.Ciphertext)
if err != nil {
return DecryptBatchResponseItem{}, errors.Wrap(err, "transit encrypt policy encrypt error", errors.CodePkgCryptoTransitDecrypt)
}
return DecryptBatchResponseItem{
Plaintext: plaintext,
}, nil
}