Documentation
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Index ¶
- func ComputeUValue(encryptKey []byte, encrypt *types.PDFEncryption, fileID []byte, verbose bool) ([]byte, error)
- func ComputeUValueV5(password []byte, passwordKey []byte, encrypt *types.PDFEncryption, ...) ([]byte, error)
- func DecryptObject(objBytes []byte, objNum, genNum int, encrypt *types.PDFEncryption) ([]byte, error)
- func DecryptPDF(pdfBytes []byte, password []byte, verbose bool) ([]byte, *types.PDFEncryption, error)
- func DecryptPDFObjects(pdfBytes []byte, encrypt *types.PDFEncryption, verbose bool) ([]byte, error)
- func DeriveEncryptionKey(password []byte, encrypt *types.PDFEncryption, fileID []byte, verbose bool) ([]byte, error)
- func DeriveEncryptionKeyV5(password []byte, encrypt *types.PDFEncryption, fileID []byte, verbose bool) ([]byte, error)
- func DeriveOwnerKey(ownerPassword []byte, encrypt *types.PDFEncryption, fileID []byte, ...) ([]byte, error)
- func DeriveOwnerKeyV5(ownerPassword []byte, encrypt *types.PDFEncryption, fileID []byte, ...) ([]byte, error)
- func DeriveUserKeyFromOwner(ownerKey []byte, encrypt *types.PDFEncryption, verbose bool) ([]byte, error)
- func ExtractFileID(pdfBytes []byte, verbose bool) []byte
- func ParseEncryptionDictionary(pdfBytes []byte, verbose bool) (*types.PDFEncryption, error)
- func UnwrapOwnerKeyV5(ownerPasswordKey []byte, encrypt *types.PDFEncryption, verbose bool) ([]byte, error)
- func UnwrapUserKeyV5(passwordKey []byte, encrypt *types.PDFEncryption, verbose bool) ([]byte, error)
- func VerifyUValueV5(password []byte, passwordKey []byte, encrypt *types.PDFEncryption, ...) (bool, error)
Constants ¶
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Variables ¶
This section is empty.
Functions ¶
func ComputeUValue ¶
func ComputeUValue(encryptKey []byte, encrypt *types.PDFEncryption, fileID []byte, verbose bool) ([]byte, error)
ComputeUValue computes the U value for password verification For revision 4 (AES), the U value is 48 bytes: 32-byte hash + 16-byte validation salt Algorithm 5 from ISO 32000-1:2008
func ComputeUValueV5 ¶
func ComputeUValueV5(password []byte, passwordKey []byte, encrypt *types.PDFEncryption, fileID []byte, verbose bool) ([]byte, error)
ComputeUValueV5 computes the U value for V5/R5/R6 password verification Based on ISO 32000-2 section 7.6.4.4.9 - uses SHA-256 and AES-128 This function computes the U value from a password for verification purposes. The actual password (not the derived key) is required for proper verification.
func DecryptObject ¶
func DecryptObject(objBytes []byte, objNum, genNum int, encrypt *types.PDFEncryption) ([]byte, error)
DecryptObject decrypts a single PDF object or stream Algorithm 1 from ISO 32000-1:2008 Implementation copied EXACTLY from PyPDF's _make_crypt_filter (lines 914-935) and CryptAES.decrypt (lines 73-88)
func DecryptPDF ¶
func DecryptPDF(pdfBytes []byte, password []byte, verbose bool) ([]byte, *types.PDFEncryption, error)
DecryptPDF decrypts a PDF using the provided password Returns decrypted PDF bytes and encryption info Note: Implementation inspired by UniPDF but written from first principles
func DecryptPDFObjects ¶
DecryptPDFObjects decrypts all encrypted objects in the PDF This is a simplified version - full implementation would parse xref table and decrypt objects individually
func DeriveEncryptionKey ¶
func DeriveEncryptionKey(password []byte, encrypt *types.PDFEncryption, fileID []byte, verbose bool) ([]byte, error)
DeriveEncryptionKey derives the encryption key from password Based on PDF encryption algorithm (ISO 32000) - Algorithm 2 (V1-V4) or 7.6.4.3.3 (V5+)
func DeriveEncryptionKeyV5 ¶
func DeriveEncryptionKeyV5(password []byte, encrypt *types.PDFEncryption, fileID []byte, verbose bool) ([]byte, error)
DeriveEncryptionKeyV5 derives the encryption key for V5/R5/R6 (AES-256) Based on ISO 32000-2 section 7.6.4.3.3 - SHA-256 based key derivation
func DeriveOwnerKey ¶
func DeriveOwnerKey(ownerPassword []byte, encrypt *types.PDFEncryption, fileID []byte, verbose bool) ([]byte, error)
DeriveOwnerKey derives the encryption key from owner password Algorithm 3 from ISO 32000-1:2008 (V1-V4) or V5 algorithm (V5+)
func DeriveOwnerKeyV5 ¶
func DeriveOwnerKeyV5(ownerPassword []byte, encrypt *types.PDFEncryption, fileID []byte, verbose bool) ([]byte, error)
DeriveOwnerKeyV5 derives the owner password key for V5/R5/R6 Similar to DeriveEncryptionKeyV5 but uses owner password
func DeriveUserKeyFromOwner ¶
func DeriveUserKeyFromOwner(ownerKey []byte, encrypt *types.PDFEncryption, verbose bool) ([]byte, error)
DeriveUserKeyFromOwner derives the user encryption key from owner key
func ExtractFileID ¶
ExtractFileID extracts the file ID from PDF trailer Returns the first element of the ID array (ID[0]) File ID can be in hex format: <7FB157EB...> or binary: (binary data)
func ParseEncryptionDictionary ¶
func ParseEncryptionDictionary(pdfBytes []byte, verbose bool) (*types.PDFEncryption, error)
ParseEncryptionDictionary parses the /Encrypt dictionary from PDF
func UnwrapOwnerKeyV5 ¶
func UnwrapOwnerKeyV5(ownerPasswordKey []byte, encrypt *types.PDFEncryption, verbose bool) ([]byte, error)
UnwrapOwnerKeyV5 unwraps the owner encryption key from /OE Similar to UnwrapUserKeyV5 but uses owner password derived key
func UnwrapUserKeyV5 ¶
func UnwrapUserKeyV5(passwordKey []byte, encrypt *types.PDFEncryption, verbose bool) ([]byte, error)
UnwrapUserKeyV5 unwraps the user encryption key from /UE using the password-derived key Based on ISO 32000-2 - uses AES-128 in ECB mode for key unwrapping
func VerifyUValueV5 ¶
func VerifyUValueV5(password []byte, passwordKey []byte, encrypt *types.PDFEncryption, fileID []byte, verbose bool) (bool, error)
VerifyUValueV5 verifies a password by comparing computed U value with stored U value Returns true if password is correct, false otherwise
Types ¶
This section is empty.
Source Files