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Difference between revisions of "Baseband TEA Keys"
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| − | The baseband generates TEA keys based of the CHIPID and NORID. |
+ | The baseband generates TEA keys based of the [[CHIPID]] and [[NORID]]. |
==Key A Generation== |
==Key A Generation== |
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tea_encipher(nexttea,(u32*)out_iv,(u32*)key); |
tea_encipher(nexttea,(u32*)out_iv,(u32*)key); |
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} |
} |
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| + | |||
| + | [[Category:Baseband]] |
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Revision as of 15:55, 19 August 2010
The baseband generates TEA keys based of the CHIPID and NORID.
Key A Generation
//return unique phone key (key A), this key is used for security zone encryption/decryption
void get_keyA(u8 *A){
SHA1Context ctx;
SHA1Reset(&ctx);
SHA1Input(&ctx,dep1_norid,0x10);
SHA1Input(&ctx,dep2_chipid,0x10);
SHA1Result(&ctx);
memcpy(A,(u8*)ctx.Message_Digest,0x14);
}
NCK Key Generation
//ulc_mix_lock_unlock_key((u8*)A,(u8*)ctx.Message_Digest,dep1_norid,dep2_chipid,(u8*)B);
void ulc_mix_lock_unlock_key(u8 *keyA, u8 *keyNCK,u8 *norid,u8 *chipid,u8 *keyB){
u8 out_iv[8];
tea_3_round_encipher(norid,keyNCK,keyA,keyB,out_iv); //norid, keyNCK, SP+4, SP+0x14, SP+0x34
tea_3_round_encipher(chipid,keyNCK,out_iv,keyB+8,out_iv); //chipid, keyNCK, SP+4, SP+0x14, SP+0x34
}
// auxilary function for nck key generation
void tea_3_round_encipher(u8 *in,u8 *key,u8 *iv,u8 *out,u8 *out_iv){
u32 tmpin[2],nexttea[2];
tea_encipher((u32*)in,tmpin,(u32*)key);
nexttea[0] = tmpin[0]^((u32*)iv)[0];
nexttea[1] = tmpin[1]^((u32*)iv)[1];
tea_encipher(nexttea,(u32*)out,(u32*)key);
nexttea[0] = tmpin[0]^((u32*)out)[0];
nexttea[1] = tmpin[1]^((u32*)out)[1];
tea_encipher(nexttea,(u32*)out_iv,(u32*)key);
}
