1 // Copyright 2023, The Android Open Source Project 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 //! Wrappers of the SHA functions in BoringSSL sha.h. 16 17 use crate::util::to_call_failed_error; 18 use bssl_avf_error::{ApiName, Result}; 19 use bssl_sys::SHA256; 20 21 /// The length of a SHA256 digest. 22 pub(crate) const SHA256_DIGEST_LENGTH: usize = bssl_sys::SHA256_DIGEST_LENGTH as usize; 23 24 /// Computes the SHA256 digest of the provided `data``. sha256(data: &[u8]) -> Result<[u8; SHA256_DIGEST_LENGTH]>25pub fn sha256(data: &[u8]) -> Result<[u8; SHA256_DIGEST_LENGTH]> { 26 let mut out = [0u8; SHA256_DIGEST_LENGTH]; 27 // SAFETY: This function reads `data` and writes to `out` within its bounds. 28 // `out` has `SHA256_DIGEST_LENGTH` bytes of space for write. 29 let ret = unsafe { SHA256(data.as_ptr(), data.len(), out.as_mut_ptr()) }; 30 if ret.is_null() { 31 Err(to_call_failed_error(ApiName::SHA256)) 32 } else { 33 Ok(out) 34 } 35 } 36