I'm posting the block encryption routine, you could probably figure out the decryption routine on your own pretty easily.

class QGBC_HP { public: class BLOCK { unsigned long long w[4]; // the 4 words of a block } class KEY { unsigned long long w[4]; // the 4 words of a block } protected: BLOCK b; // previous block bool cbc; void left_rotate(BLOCK& c, int l) { if (l == 57) { unsigned long long c0 = c.w[0]; c.w[0] = (c.w[0] << 57) | (c.w[1] >> 7); c.w[1] = (c.w[1] << 57) | (c.w[2] >> 7); c.w[2] = (c.w[2] << 57) | (c.w[3] >> 7); c.w[3] = (c.w[3] << 57) | (c.w >> 7); } else if (l == 83) { unsigned long long c0 = c.w[0]; unsigned long long c1 = c.w[1]; c.w[0] = (c.w[1] << 19) | (c.w[2] >> 45); c.w[1] = (c.w[2] << 19) | (c.w[3] >> 45); c.w[2] = (c.w[3] << 19) | (c0 >> 45); c.w[3] = (c0 << 19) | (c1 >> 45); } } public: QGBC_HP() : cbc(false) { } void init(bool cbc = false, BLOCK* iv = NULL) { this->cbc = cbc; if (cbc) { if (iv != null) { b.w[0] = iv->w[0]; b.w[1] = iv->w[1]; b.w[2] = iv->w[2]; b.w[3] = iv->w[3]; } else { throw std::exception("iv must not be null if cbc is true"); } } else { b.w[0] = b.w[1] = b.w[2] = b.w[3] = 0; } } void encrypt_block(KEY& k, BLOCK& m, BLOCK& c) { if (cbc) { c.w[0] = m.w[0] ^ b.w[0]; c.w[1] = m.w[1] ^ b.w[1]; c.w[2] = m.w[2] ^ b.w[2]; c.w[3] = m.w[3] ^ b.w[3]; } for(int x=0; x<4; ++x) { if (x == 1) left_rotate(c, 57); else if (x > 1) left_rotate(c, 83); c.w[0] = K.w[3] ^ ( ~K.w[x] + c.w[0]); c.w[1] = K.w[2] ^ ( c.w[0] + c.w[1]); c.w[2] = K.w[1] ^ ( c.w[1] + c.w[2]); c.w[3] = K.w[0] ^ ( c.w[2] + c.w[3]); } if (cbc) { b.w[0] = c.w[0]; b.w[1] = c.w[1]; b.w[2] = c.w[2]; b.w[3] = c.w[3]; } } };

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