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2 | * |
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34 | */ |
35 | |
36 | #include "cc_runtime_config.h" |
37 | #include "ccaes_vng_gcm.h" |
38 | #include "ccmode_internal.h" |
39 | |
40 | /*! |
41 | * GCM multiply by H |
42 | * @param key The GCM state which holds the H value |
43 | * @param I The value to multiply H by |
44 | */ |
45 | void |
46 | ccmode_gcm_mult_h(ccgcm_ctx *key, unsigned char *I) |
47 | { |
48 | #if CCMODE_GCM_VNG_SPEEDUP |
49 | #ifdef __x86_64__ |
50 | if (!(CC_HAS_AESNI() && CC_HAS_SupplementalSSE3())) { |
51 | //It can handle in and out buffers to be the same |
52 | ccmode_gcm_gf_mult(CCMODE_GCM_KEY_H(key), I, I); |
53 | return; |
54 | } else |
55 | #endif |
56 | { |
57 | // CCMODE_GCM_VNG_KEY_Htable must be the second argument. gcm_gmult() is not a general multiplier function. |
58 | gcm_gmult(I, CCMODE_GCM_VNG_KEY_Htable(key), I ); |
59 | return; |
60 | } |
61 | #else |
62 | //It can handle in and out buffers to be the same |
63 | ccmode_gcm_gf_mult(CCMODE_GCM_KEY_H(key), b: I, c: I); |
64 | #endif |
65 | } |
66 | |