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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,12 @@ | ||
| # OpenSSL GCM | ||
| AES GCM Encryption/Decryption I/O streams | ||
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| ## See | ||
| * https://github.com/minio/sio/ | ||
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| ## Credits | ||
| * https://github.com/aws/aws-sdk-go/blob/master/service/s3/s3crypto/aes_gcm.go | ||
| * https://github.com/catalyzeio/gcm/blob/master/gcm/gcm.go | ||
| * https://github.com/spacemonkeygo/openssl/blob/master/ciphers_test.go | ||
| * https://github.com/marcopaganini/iocrypt/blob/master/iocrypt.go | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| package main | ||
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| import ( | ||
| "encoding/hex" | ||
| "fmt" | ||
| "io" | ||
| "os" | ||
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| aesgcm "github.com/hbakhtiyor/openssl_gcm" | ||
| ) | ||
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| // DecryptFile decrypts the file at the specified path using GCM. | ||
| func DecryptFile(inFilePath, outFilePath string, key, iv, aad []byte) error { | ||
| stat, err := os.Stat(inFilePath) | ||
| if os.IsNotExist(err) { | ||
| return fmt.Errorf("A file does not exist at %s", inFilePath) | ||
| } else if err != nil { | ||
| return err | ||
| } | ||
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| inFile, err := os.Open(inFilePath) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer inFile.Close() | ||
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| outFile, err := os.Create(outFilePath) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer outFile.Close() | ||
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| r, err := aesgcm.NewGcmDecryptReader(inFile, key, iv, aad, stat.Size()) | ||
| if err != nil { | ||
| return err | ||
| } | ||
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| _, err = io.Copy(outFile, r) | ||
| return err | ||
| } | ||
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| func main() { | ||
| inFilePath := "testdata.enc" | ||
| outFilePath := "testdata" | ||
| key, _ := hex.DecodeString("81be5e09c111576103a8507658d47891") | ||
| iv, _ := hex.DecodeString("81be5e09c111576103a85076") | ||
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| if err := DecryptFile(inFilePath, outFilePath, key, iv, nil); err != nil { | ||
| panic(err) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| package openssl_gcm | ||
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| import ( | ||
| "bytes" | ||
| "fmt" | ||
| "io" | ||
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| "github.com/spacemonkeygo/openssl" | ||
| ) | ||
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| type gcmEncryptReader struct { | ||
| src io.Reader | ||
| ctx openssl.AuthenticatedEncryptionCipherCtx | ||
| eof bool | ||
| buf *bytes.Buffer // for finalize small bytes | ||
| } | ||
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| func NewGcmEncryptReader(r io.Reader, key, iv, aad []byte) (*gcmEncryptReader, error) { | ||
| ctx, err := openssl.NewGCMEncryptionCipherCtx(len(key)*8, nil, key, iv) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("Failed making GCM encryption ctx: %v", err) | ||
| } | ||
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| if len(aad) > 0 { | ||
| err = ctx.ExtraData(aad) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("Failed to add authenticated data: %v", err) | ||
| } | ||
| } | ||
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| return &gcmEncryptReader{ | ||
| src: r, | ||
| ctx: ctx, | ||
| buf: &bytes.Buffer{}, | ||
| }, nil | ||
| } | ||
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| func (r *gcmEncryptReader) Read(p []byte) (int, error) { | ||
| if r.eof { | ||
| return r.buf.Read(p) | ||
| } | ||
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| n, err := r.src.Read(p) | ||
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| if err == io.EOF { | ||
| data, err := r.ctx.EncryptFinal() | ||
| if err != nil { | ||
| return len(data), fmt.Errorf("Failed to finalize encryption: %v", err) | ||
| } | ||
| r.buf.Write(data) | ||
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| tag, err := r.ctx.GetTag() | ||
| if err != nil { | ||
| return len(data) + len(tag), fmt.Errorf("Failed to get GCM tag: %v", err) | ||
| } | ||
| r.buf.Write(tag) | ||
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| r.eof = true | ||
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| return r.buf.Read(p) | ||
| } else if err != nil { | ||
| return n, err | ||
| } | ||
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| data, err := r.ctx.EncryptUpdate(p[:n]) | ||
| if err != nil { | ||
| return len(data), fmt.Errorf("Failed to perform an encryption: %v", err) | ||
| } | ||
| copy(p, data) | ||
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| return n, nil | ||
| } |