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66 lines
2.7 KiB
C
66 lines
2.7 KiB
C
#ifndef _SIMPLECRYPTO_H_
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#define _SIMPLECRYPTO_H_
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#include <stdio.h>
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#include <stdint.h>
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// ---------------MD5 area---------------
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// return 128bit(16bytes) digest
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uint8_t* md5(const uint8_t *data, size_t data_len, uint8_t digest[16]);
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// ---------------MD5 area---------------
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// ---------------TEA area---------------
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// TEA is the password of the tea algorithm
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struct TEA {
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uint32_t t[4];
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};
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typedef struct TEA TEA;
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// tea_encrypt_len is exactly the input buffer length
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inline int64_t tea_encrypt_len(int64_t inlen) {
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int64_t fill = 10 - (inlen+1)%8;
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return fill+inlen+7;
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}
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// tea_decrypt_len's buf0 is the first byte of the buffer passed into decode
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// if you want to allocate decode buffer, just use the encoded data length
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inline int64_t tea_decrypt_len(int64_t inlen, uint8_t buf0) {
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int start = (buf0&7)+3;
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return inlen-7-start;
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}
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// tea_encrypt_qq use qq sumtable, read from src, write to dst, return write count
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// please allocate no less than tea_encrypt_len(len(src)) bytes for dst
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int64_t tea_encrypt_qq(const TEA t, const uint8_t* src, int64_t srclen, uint8_t* dst);
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// tea_encrypt use custom sumtable, read from src, write to dst, return write count
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// please allocate no less than tea_encrypt_len(len(src)) bytes for dst
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int64_t tea_encrypt(const TEA t, const uint32_t sumtable[0x10], const uint8_t* src, int64_t srclen, uint8_t* dst);
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// tea_encrypt_qq_native_endian is the same as tea_encrypt_qq on BE machine
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int64_t tea_encrypt_qq_native_endian(const TEA t, const uint8_t* src, int64_t srclen, uint8_t* dst);
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// tea_encrypt_native_endian is the same as tea_encrypt on BE machine
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int64_t tea_encrypt_native_endian(const TEA t, const uint32_t sumtable[0x10], const uint8_t* src, int64_t srclen, uint8_t* dst);
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// tea_decrypt_qq use qq sumtable, read from src, write to dst, return start pointer of decrypted data
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// length can be calculated by tea_decrypt_len or dst_buf_last-dst
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uint8_t* tea_decrypt_qq(const TEA t, const uint8_t* src, int64_t srclen, uint8_t* dst);
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// tea_decrypt use custom sumtable, read from src, write to dst, return start pointer of decrypted data
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// length can be calculated by tea_decrypt_len or dst_buf_last-dst
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uint8_t* tea_decrypt(const TEA t, const uint32_t sumtable[0x10], const uint8_t* src, int64_t srclen, uint8_t* dst);
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// tea_decrypt_qq_native_endian is the same as tea_decrypt_qq on BE machine
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uint8_t* tea_decrypt_qq_native_endian(const TEA t, const uint8_t* src, int64_t srclen, uint8_t* dst);
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// tea_decrypt_native_endian is the same as tea_decrypt on BE machine
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uint8_t* tea_decrypt_native_endian(const TEA t, const uint32_t sumtable[0x10], const uint8_t* src, int64_t srclen, uint8_t* dst);
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// ---------------TEA area---------------
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#endif
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