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Merge pull request #42 from newrelic/dev
Release v1.2.0
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -10,7 +10,7 @@ require ( | |
| ) | ||
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| require( | ||
| golang.org/x/net v0.17.0 | ||
| golang.org/x/net v0.23.0 | ||
| ) | ||
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| exclude( | ||
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||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| package security_utils | ||
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| import ( | ||
| "crypto/aes" | ||
| "crypto/cipher" | ||
| "crypto/sha1" | ||
| "crypto/sha256" | ||
| "encoding/hex" | ||
| "errors" | ||
| "fmt" | ||
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| "golang.org/x/crypto/pbkdf2" | ||
| ) | ||
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| const ( | ||
| ITERATION = 1024 | ||
| KEY_LEN = 32 // 256 bits | ||
| OFFSET = 16 | ||
| EMPTY_PASSWORD = "Empty Password provided" | ||
| DATA_TO_BE_DECRYPTED = "Data to be decrypted is Empty" | ||
| INCORRECT_SECRET = "Incorrect Password / salt provided: %s" | ||
| EMPTY_SECRET = "secretKey is empty" | ||
| ERROR_WHILE_DECRYPTION = "Error while decryption %s: %s" | ||
| ENCRYPTED_DATA_DECRYPTED_DATA = "Encrypted Data: %s, Decrypted data: %s" | ||
| ERROR_WHILE_GENERATING_REQUIRED_SALT_FROM_S_S = "Error while generating required salt from %s" | ||
| ERROR_WHILE_VERIFY_HASH_DATA = "Hash Data not macth %s: %s" | ||
| ) | ||
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| func Decrypt(password, encryptedData, hashVerifier string) (string, error) { | ||
| if password == "" { | ||
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| return "", fmt.Errorf(EMPTY_PASSWORD) | ||
| } | ||
| if encryptedData == "" { | ||
| return "", fmt.Errorf(DATA_TO_BE_DECRYPTED) | ||
| } | ||
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| salt, err := generateSalt(password) | ||
| if err != nil { | ||
| return "", fmt.Errorf(ERROR_WHILE_GENERATING_REQUIRED_SALT_FROM_S_S, err) | ||
| } | ||
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| secretKey := deriveKey(password, salt) | ||
| if secretKey == nil { | ||
| return "", errors.New(EMPTY_SECRET) | ||
| } | ||
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| encryptedBytes, err := hex.DecodeString(encryptedData) | ||
| if err != nil { | ||
| return "", fmt.Errorf(INCORRECT_SECRET, err) | ||
| } | ||
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| block, err := aes.NewCipher(secretKey) | ||
| if err != nil { | ||
| return "", fmt.Errorf(INCORRECT_SECRET, err) | ||
| } | ||
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| decrypted := make([]byte, len(encryptedBytes)) | ||
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| cipher.NewCBCDecrypter(block, make([]byte, block.BlockSize())).CryptBlocks(decrypted, encryptedBytes) | ||
| decrypted = removePadding(decrypted) | ||
| decryptedData := string(decrypted[OFFSET:]) | ||
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| if verifyHashData(hashVerifier, decryptedData) { | ||
| return decryptedData, nil | ||
| } else { | ||
| return "", fmt.Errorf(ERROR_WHILE_VERIFY_HASH_DATA, hashVerifier, decryptedData) | ||
| } | ||
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| } | ||
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| func generateSalt(salt string) ([]byte, error) { | ||
| // Encode the first OFFSET characters of the salt as hexadecimal | ||
| if len([]byte(salt)) < OFFSET { | ||
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| return nil, errors.New("Error while generating required salt") | ||
| } | ||
| encoded := hex.EncodeToString([]byte(salt)[:OFFSET]) | ||
|
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| decoded, err := hex.DecodeString(encoded) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
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| return decoded, nil | ||
| } | ||
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| func deriveKey(password string, salt []byte) []byte { | ||
| key, err := pbkdf2KeyDerivation([]byte(password), salt, ITERATION, KEY_LEN) | ||
| if err != nil { | ||
| return nil | ||
| } | ||
| return key | ||
| } | ||
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| func pbkdf2KeyDerivation(password, salt []byte, iterations, keyLen int) ([]byte, error) { | ||
| key := pbkdf2.Key(password, salt, iterations, keyLen, sha1.New) | ||
| return key, nil | ||
| } | ||
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| func verifyHashData(knownDecryptedDataHash, decryptedData string) bool { | ||
| return knownDecryptedDataHash == generateSHA256HexDigest(decryptedData) | ||
| } | ||
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| func generateSHA256HexDigest(data string) string { | ||
| digest := sha256.Sum256([]byte(data)) | ||
| return hex.EncodeToString(digest[:]) | ||
| } | ||
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| func removePadding(data []byte) []byte { | ||
| if i := len(data) - 1; i > 0 { | ||
| paddingLength := int(data[i]) | ||
| if j := len(data) - paddingLength; j > 0 { | ||
| return data[:j] | ||
| } | ||
| } | ||
| return data | ||
| } |
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