mpi_read_buffer(9)

🎀 NAME 🎀

okay bestie, welcome to mpi_read_buffer(9) from the Kernel API Manual 💖 this page is literally about read MPI to a buffer provided by user (msb first) — and yes, the msb first detail is iconic and stays. ✨

📜 SYNOPSIS 📜

int mpi_read_buffer (MPI a , uint8_t *buf , unsigned buf_len , unsigned *nbytes , int *sign );

look at that signature, slay 💅

🌸 ARGUMENTS 🌸

• a — a multi precision integer. your main character integer, fr fr 🫶
• buf — buffer to which the output will be written to. Needs to be at least mpi_get_size(a) long. no cap, size matters here 💖
• buf_len — size of the buf. the vibe check for how much room you actually gave it 🎀
• nbytes — receives the actual length of the data written on success and the data to-be-written on -EOVERFLOW in case buf_len was too small. yep, it’s the receipts on success and the “bestie your buffer was too small” receipt on overflow 😭
• sign — if not NULL, it will be set to the sign of a. so if you pass a real pointer, it gets the sign, periodt 💅

💫 RETURN 💫

0 on success or error code in case of error — that’s the whole mood, bestie ✅

🔥 SEE ALSO 🔥

Kernel file ./lib/crypto/mpi/mpicoder.c — plus mpi_read_raw_data(9), mpi_write_to_sgl(9). go read those too, iykyk 🫶✨

source/version: ./lib/crypto/mpi · dated October 2026 — mwah, bestie 💋💖