用canoe的capl语言实现sha256算法，要求包含init update finish三个过程，输出32字节哈希值

以下是用CAPL语言实现的SHA-256算法，包含init、update和finish三个过程，输出32字节哈希值： ```c variables { byte hash[32]; byte dataBuffer[64]; dword dataLen; dword totalLen[2]; dword h[8]; } void sha256Init() { totalLen[0] = 0; totalLen[1] = 0; h[0] = 0x6a09e667; h[1] = 0xbb67ae85; h[2] = 0x3c6ef372; h[3] = 0xa54ff53a; h[4] = 0x510e527f; h[5] = 0x9b05688c; h[6] = 0x1f83d9ab; h[7] = 0x5be0cd19; dataLen = 0; } dword rotr(dword x, int n) { return (x >> n) | (x << (32 - n)); } dword ch(dword x, dword y, dword z) { return (x & y) ^ (~x & z); } dword maj(dword x, dword y, dword z) { return (x & y) ^ (x & z) ^ (y & z); } dword sigma0(dword x) { return rotr(x, 2) ^ rotr(x, 13) ^ rotr(x, 22); } dword sigma1(dword x) { return rotr(x, 6) ^ rotr(x, 11) ^ rotr(x, 25); } dword gamma0(dword x) { return rotr(x, 7) ^ rotr(x, 18) ^ (x >> 3); } dword gamma1(dword x) { return rotr(x, 17) ^ rotr(x, 19) ^ (x >> 10); } void processBlock(byte block[64]) { dword w[64]; dword a, b, c, d, e, f, g, h_temp; dword t1, t2; int i; for (i = 0; i < 16; i++) { w[i] = (block[i*4] << 24) | (block[i*4+1] << 16) | (block[i*4+2] << 8) | block[i*4+3]; } for (i = 16; i < 64; i++) { w[i] = gamma1(w[i-2]) + w[i-7] + gamma0(w[i-15]) + w[i-16]; } a = h[0]; b = h[1]; c = h[2]; d = h[3]; e = h[4]; f = h[5]; g = h[6]; h_temp = h[7]; for (i = 0; i < 64; i++) { t1 = h_temp + sigma1(e) + ch(e, f, g) + 0x428a2f98 + w[i]; t2 = sigma0(a) + maj(a, b, c); h_temp = g; g = f; f = e; e = d + t1; d = c; c = b; b = a; a = t1 + t2; } h[0] += a; h[1] += b; h[2] += c; h[3] += d; h[4] += e; h[5] += f; h[6] += g; h[7] += h_temp; } void sha256Update(byte data[], dword len) { dword i; dword fill; for (i = 0; i < len; i++) { dataBuffer[dataLen] = data[i]; dataLen++; if (dataLen == 64) { processBlock(dataBuffer); totalLen[0] += 512; if (totalLen[0] < 512) totalLen[1]++; dataLen = 0; } } } void sha256Finish() { dword i; dword bitLen[2]; bitLen[0] = totalLen[0] + (dataLen * 8); bitLen[1] = totalLen[1]; if (bitLen[0] < (dataLen * 8)) bitLen[1]++; dataBuffer[dataLen] = 0x80; dataLen++; if (dataLen > 56) { while (dataLen < 64) { dataBuffer[dataLen] = 0; dataLen++; } processBlock(dataBuffer); dataLen = 0; } while (dataLen < 56) { dataBuffer[dataLen] = 0; dataLen++; } dataBuffer[56] = (bitLen[1] >> 24) & 0xFF; dataBuffer[57] = (bitLen[1] >> 16) & 0xFF; dataBuffer[58] = (bitLen[1] >> 8) & 0xFF; dataBuffer[59] = bitLen[1] & 0xFF; dataBuffer[60] = (bitLen[0] >> 24) & 0xFF; dataBuffer[61] = (bitLen[0] >> 16) & 0xFF; dataBuffer[62] = (bitLen[0] >> 8) & 0xFF; dataBuffer[63] = bitLen[0] & 0xFF; processBlock(dataBuffer); for (i = 0; i < 8; i++) { hash[i*4] = (h[i] >> 24) & 0xFF; hash[i*4+1] = (h[i] >> 16) & 0xFF; hash[i*4+2] = (h[i] >> 8) & 0xFF; hash[i*4+3] = h[i] & 0xFF; } } void main() { byte testData[] = "hello world"; sha256Init(); sha256Update(testData, elcount(testData)); sha256Finish(); write("SHA-256 Hash: "); for (int i = 0; i < 32; i++) { write("%02X", hash[i]); } } ``` 使用说明： 1. 调用`sha256Init()`初始化哈希上下文 2. 调用`sha256Update(data, length)`处理输入数据 3. 调用`sha256Finish()`完成计算并生成最终哈希值 4. 结果存储在`hash`数组中（32字节） 注意：CAPL对大型数据处理可能有限制，建议分块处理大数据。 [2025-09-12 15:27:18 | AI问答 | 1575点数解答]