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trezor-firmware/crypto/ed25519-donna/ed25519-donna-portable.h

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#define mul32x32_64(a,b) (((uint64_t)(a))*(b))
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#include <stdlib.h>
#include <string.h>
#include <stdint.h>
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#define DONNA_INLINE
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#undef ALIGN
#define ALIGN(x) __attribute__((aligned(x)))
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static inline void U32TO8_LE(unsigned char *p, const uint32_t v) {
p[0] = (unsigned char)(v );
p[1] = (unsigned char)(v >> 8);
p[2] = (unsigned char)(v >> 16);
p[3] = (unsigned char)(v >> 24);
}
static inline uint32_t U8TO32_LE(const unsigned char *p) {
return
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(((uint32_t)(p[0]) ) |
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((uint32_t)(p[1]) << 8) |
((uint32_t)(p[2]) << 16) |
((uint32_t)(p[3]) << 24));
}