30 lines
583 B
C
30 lines
583 B
C
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#define TRACE_MODULE _3gpp_kdf
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#include "core_debug.h"
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#include "core_sha2_hmac.h"
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void derive_kasme(const c_uint8_t *ck, const c_uint8_t *ik,
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const c_uint8_t plmn[3], const c_uint8_t *sqn, const c_uint8_t *ak,
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c_uint8_t *kasme)
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{
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c_uint8_t s[14];
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c_uint8_t k[32];
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int i;
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memcpy(&k[0], ck, 16);
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memcpy(&k[0], ik, 16);
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s[0] = 0x10;
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memcpy(&s[1], plmn, 3);
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s[4] = 0x00;
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s[5] = 0x03;
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for (i = 0; i < 6; i++)
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s[6+i] = sqn[i] ^ ak[i];
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s[12] = 0x00;
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s[13] = 0x06;
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hmac_sha256(k, 32, s, 14, kasme, 32);
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}
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