static void calculate_M( SRP_HashAlgorithm alg, NGConstant *ng, unsigned char * dest, const char * I, const BIGNUM * s, const BIGNUM * A, const BIGNUM * B, const unsigned char * K ) { unsigned char H_N[ SHA256_DIGEST_LENGTH ]; unsigned char H_g[ SHA256_DIGEST_LENGTH ]; unsigned char H_I[ SHA256_DIGEST_LENGTH ]; unsigned char H_xor[ SHA256_DIGEST_LENGTH ]; HashCTX ctx; int i = 0; int hash_len = hash_length(alg); hash_num( alg, ng->N, H_N ); hash_num( alg, ng->g, H_g ); hash(alg, (const unsigned char *)I, strlen(I), H_I); for (i=0; i < hash_len; i++ ) H_xor[i] = H_N[i] ^ H_g[i]; hash_init( alg, &ctx ); hash_update( alg, &ctx, H_xor, hash_len ); hash_update( alg, &ctx, H_I, hash_len ); update_hash_n( alg, &ctx, s ); update_hash_n( alg, &ctx, A ); update_hash_n( alg, &ctx, B ); hash_update( alg, &ctx, K, hash_len ); hash_final( alg, &ctx, dest ); }
static SRP_Result calculate_M(SRP_HashAlgorithm alg, NGConstant *ng, unsigned char *dest, const char *I, const unsigned char *s_bytes, size_t s_len, const mpz_t A, const mpz_t B, const unsigned char *K) { unsigned char H_N[SHA512_DIGEST_LENGTH]; unsigned char H_g[SHA512_DIGEST_LENGTH]; unsigned char H_I[SHA512_DIGEST_LENGTH]; unsigned char H_xor[SHA512_DIGEST_LENGTH]; HashCTX ctx; size_t i = 0; size_t hash_len = hash_length(alg); if (!hash_num(alg, ng->N, H_N)) return SRP_ERR; if (!hash_num(alg, ng->g, H_g)) return SRP_ERR; hash(alg, (const unsigned char *)I, strlen(I), H_I); for (i = 0; i < hash_len; i++) H_xor[i] = H_N[i] ^ H_g[i]; hash_init(alg, &ctx); hash_update(alg, &ctx, H_xor, hash_len); hash_update(alg, &ctx, H_I, hash_len); hash_update(alg, &ctx, s_bytes, s_len); if (!update_hash_n(alg, &ctx, A)) return SRP_ERR; if (!update_hash_n(alg, &ctx, B)) return SRP_ERR; hash_update(alg, &ctx, K, hash_len); hash_final(alg, &ctx, dest); return SRP_OK; }
static void calculate_H_AMK( SRP_HashAlgorithm alg, unsigned char *dest, const BIGNUM * A, const unsigned char * M, const unsigned char * K ) { HashCTX ctx; hash_init( alg, &ctx ); update_hash_n( alg, &ctx, A ); hash_update( alg, &ctx, M, hash_length(alg) ); hash_update( alg, &ctx, K, hash_length(alg) ); hash_final( alg, &ctx, dest ); }
static SRP_Result calculate_H_AMK(SRP_HashAlgorithm alg, unsigned char *dest, const mpz_t A, const unsigned char *M, const unsigned char *K) { HashCTX ctx; hash_init(alg, &ctx); if (!update_hash_n(alg, &ctx, A)) return SRP_ERR; hash_update(alg, &ctx, M, hash_length(alg)); hash_update(alg, &ctx, K, hash_length(alg)); hash_final(alg, &ctx, dest); return SRP_OK; }