89 lines
2.8 KiB
C
89 lines
2.8 KiB
C
#ifndef OLE2_ENCRYPTION_H_
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#define OLE2_ENCRYPTION_H_
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#ifndef HAVE_ATTRIB_PACKED
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#define __attribute__(x)
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#endif
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#ifdef HAVE_PRAGMA_PACK
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#pragma pack(1)
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#endif
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#ifdef HAVE_PRAGMA_PACK_HPPA
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#pragma pack 1
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#endif
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#define SE_HEADER_EI_AES128_KEYSIZE 0x00000080
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#define SE_HEADER_EI_AES192_KEYSIZE 0x000000c0
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#define SE_HEADER_EI_AES256_KEYSIZE 0x00000100
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typedef struct {
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uint8_t key[SE_HEADER_EI_AES256_KEYSIZE]; /*The longest key length supported by ole encryption */
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uint32_t key_length_bits;
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} encryption_key_t;
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/* https://docs.microsoft.com/en-us/openspecs/office_file_formats/ms-offcrypto/dca653b5-b93b-48df-8e1e-0fb9e1c83b0f */
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typedef struct __attribute__((packed)) {
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uint32_t flags;
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uint32_t sizeExtra; /* must be 0 */
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uint32_t algorithmID;
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uint32_t algorithmIDHash;
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uint32_t keySize;
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uint32_t providerType;
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uint32_t reserved1;
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uint32_t reserved2; /* MUST be 0 */
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uint8_t cspName[1]; /* really the rest of the data in the block. Starts with a
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string of wide characters, followed by the encryption verifier.
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It is 44 instead of 32 because this structure is only used inside
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encryption_info_stream_standard_t (below). It is in two different
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structures because of the way the documentation is written.
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*/
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} encryption_info_t;
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/*
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* https://learn.microsoft.com/en-us/openspecs/office_file_formats/ms-offcrypto/2895eba1-acb1-4624-9bde-2cdad3fea015
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*/
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typedef struct __attribute__((packed)) {
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uint16_t version_major;
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uint16_t version_minor;
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uint32_t flags; /* https://docs.microsoft.com/en-us/openspecs/office_file_formats/ms-offcrypto/200a3d61-1ab4-4402-ae11-0290b28ab9cb */
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uint32_t size;
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union {
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encryption_info_t encryptionInfo;
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uint8_t padding[512 - 12]; /* Subtract the size of version_major, version_minor, flags and size.
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This consumes a sector (512 bytes), so make sure enough space is always allocated.
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*/
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};
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} encryption_info_stream_standard_t;
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#define CSP_NAME_LENGTH(__ptr__) (sizeof(__ptr__->padding) - sizeof(__ptr__->encryptionInfo) + 1)
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/* https://learn.microsoft.com/en-us/openspecs/office_file_formats/ms-offcrypto/e5ad39b8-9bc1-4a19-bad3-44e6246d21e6 */
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typedef struct __attribute__((packed)) {
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uint32_t salt_size;
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uint8_t salt[16];
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uint8_t encrypted_verifier[16];
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uint32_t verifier_hash_size;
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uint8_t encrypted_verifier_hash[32]; /* RC4 requires 20 bytes
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AES requires 32 bytes
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*/
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} encryption_verifier_t;
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#ifdef HAVE_PRAGMA_PACK
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#pragma pack()
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#endif
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#ifdef HAVE_PRAGMA_PACK_HPPA
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#pragma pack
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#endif
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#endif /* OLE2_ENCRYPTION_H_ */
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